param(
    [ValidateSet('1', '2', '3', '4', 'candidate-i', 'candidate-j', 'candidate-m', 'candidate-n', 'candidate-o', 'candidate-p', 'restore', 'exit')]
    [string]$Choice,

    [string]$ExePath = $(
        if (Test-Path -LiteralPath (Join-Path $PSScriptRoot 'CRUSADER.EXE')) {
            Join-Path $PSScriptRoot 'CRUSADER.EXE'
        }
        elseif (Test-Path -LiteralPath 'F:\Apps\Crusader No Remorse\CRUSADER.EXE') {
            'F:\Apps\Crusader No Remorse\CRUSADER.EXE'
        }
        else {
            Join-Path $PSScriptRoot 'CRUSADER.EXE'
        }
    )
)

Set-StrictMode -Version Latest
$ErrorActionPreference = 'Stop'

$exePath = $ExePath
$statePath = Join-Path $PSScriptRoot 'patch_crusader_cheat_menu.state.json'

$sites = @{
    CtrlQDebuggerInit = @{
        Label = 'Ctrl+Q debugger-state init body'
        Offset = 0xC970D
        Original = [byte[]](
            0xA0, 0x4F, 0x60, 0xB4, 0x00, 0xF7, 0xD8, 0x1B, 0xC0, 0x40, 0xA2, 0x4F, 0x60, 0x80, 0x3E, 0x4F,
            0x60, 0x00, 0x74, 0x47, 0x6A, 0xFF, 0x6A, 0xFF, 0xC4, 0x1E, 0xD0, 0x4C, 0x26, 0x8A, 0x47, 0x05,
            0x50, 0x1E, 0x68, 0xD2, 0x60, 0x6A, 0x00, 0x6A, 0x00, 0x83, 0xEC, 0x06, 0xC7, 0x86, 0x76, 0xFF,
            0x00, 0x00, 0x8B, 0x86, 0x76, 0xFF, 0xF7, 0xD0, 0x89, 0x86, 0x78, 0xFF, 0xC6, 0x86, 0x7A, 0xFF,
            0x00, 0x6A, 0x00, 0x6A, 0x00, 0x9A, 0xFF, 0xFF, 0x00, 0x00, 0x83, 0xC4, 0x14, 0x52, 0x50, 0x9A,
            0xFF, 0xFF, 0x00, 0x00, 0x83, 0xC4, 0x08, 0x5F, 0x5E, 0xC9, 0xCB, 0x6A, 0xFF, 0x6A, 0xFF, 0xC4,
            0x1E, 0xD0, 0x4C, 0x26, 0x8A, 0x47, 0x05, 0x50, 0x1E, 0x68, 0xEE, 0x60, 0x6A, 0x00, 0x6A, 0x00,
            0x83, 0xEC, 0x06, 0xC7
        )
        Patched = [byte[]](
            0xA1, 0x9C, 0x65, 0x0B, 0x06, 0x9E, 0x65, 0x74, 0x10, 0xC4, 0x1E, 0x9C, 0x65, 0xC6, 0x47, 0x75,
            0x00, 0xC6, 0x47, 0x74, 0x01, 0x5F, 0x5E, 0xC9, 0xCB, 0x6A, 0x00, 0x6A, 0x00, 0xE9, 0x25, 0x00,
            0x55, 0x8B, 0xEC, 0xA1, 0x9C, 0x65, 0x39, 0x46, 0x06, 0x75, 0x16, 0xA1, 0x9E, 0x65, 0x39, 0x46,
            0x08, 0x75, 0x0E, 0xC4, 0x5E, 0x06, 0xC7, 0x47, 0x74, 0x00, 0x00, 0x6A, 0x00, 0x6A, 0x00, 0xEB,
            0x0E, 0x5D, 0xCB, 0x90, 0x90, 0x9A, 0xFF, 0xFF, 0x00, 0x00, 0x83, 0xC4, 0x04, 0xEB, 0x0A, 0x9A,
            0xFF, 0xFF, 0x00, 0x00, 0x83, 0xC4, 0x04, 0x5D, 0xCB, 0x0B, 0xC2, 0x74, 0x13, 0xA3, 0x9C, 0x65,
            0x89, 0x16, 0x9E, 0x65, 0x89, 0xC3, 0x8E, 0xC2, 0xC6, 0x47, 0x75, 0x00, 0xC6, 0x47, 0x74, 0x01,
            0x5F, 0x5E, 0xC9, 0xCB
        )
        LegacyPatched = [byte[]](
            0xA1, 0x9C, 0x65, 0x0B, 0x06, 0x9E, 0x65, 0x75, 0x52, 0x31, 0xC0, 0x50, 0x50, 0xEB, 0x36,
            0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
            0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
            0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
            0x90, 0x90, 0x90, 0x90, 0x90, 0x9A, 0xFF, 0xFF, 0x00, 0x00, 0x83, 0xC4, 0x04, 0x0B, 0xC2, 0x75,
            0x03, 0xE9, 0x46, 0x06, 0xA3, 0x9C, 0x65, 0x89, 0x16, 0x9E, 0x65, 0xC4, 0x1E, 0x9C, 0x65, 0xC6,
            0x47, 0x75, 0x01, 0xC6, 0x47, 0x74, 0x00, 0xC7, 0x47, 0x76, 0x00, 0x00, 0xC7, 0x47, 0x78, 0x00,
            0x00, 0xE9, 0x26, 0x06, 0xC7
        )
        LegacyPatchedVariants = @(
            [byte[]](
                0xA1, 0x9C, 0x65, 0x0B, 0x06, 0x9E, 0x65, 0x75, 0x5E, 0x31, 0xC0, 0x50, 0x50, 0x90, 0x90, 0x90,
                0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
                0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
                0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
                0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x9A, 0xFF, 0xFF, 0x00, 0x00, 0x83, 0xC4, 0x04,
                0xEB, 0x0D, 0x9A, 0xFF, 0xFF, 0x00, 0x00, 0x83, 0xC4, 0x04, 0x5F, 0x5E, 0xC9, 0xCB, 0x0B, 0xC2,
                0x74, 0xF8, 0xA3, 0x9C, 0x65, 0x89, 0x16, 0x9E, 0x65, 0x6A, 0x00, 0x6A, 0x00, 0xEB, 0xE2, 0x90,
                0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0xC7
            ),
            [byte[]](
                0xA1, 0x9C, 0x65, 0x0B, 0x06, 0x9E, 0x65, 0x75, 0x5E, 0x31, 0xC0, 0x50, 0x50, 0x90, 0x90, 0x90,
                0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
                0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
                0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
                0x90, 0x90, 0x90, 0x90, 0x90, 0x9A, 0xFF, 0xFF, 0x00, 0x00, 0x83, 0xC4, 0x04, 0xEB, 0x0D, 0x9A,
                0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x04, 0x5F, 0x5E, 0xC9, 0xCB, 0x0B, 0xC2, 0x74, 0xF7, 0xA3,
                0x9C, 0x65, 0x89, 0x16, 0x9E, 0x65, 0x6A, 0x00, 0x6A, 0x00, 0xEB, 0xE2, 0x90, 0x90, 0x90, 0x90,
                0x90, 0x90, 0x90, 0xEC, 0x06, 0xC7
            ),
            [byte[]](
                0xA1, 0x9C, 0x65, 0x0B, 0x06, 0x9E, 0x65, 0x75, 0x55, 0x31, 0xC0, 0x50, 0x50, 0x90, 0x90, 0x90,
                0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
                0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
                0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
                0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x9A, 0xFF, 0xFF, 0x00, 0x00, 0x83, 0xC4, 0x04,
                0x52, 0x50, 0x9A, 0xFF, 0xFF, 0x00, 0x00, 0x83, 0xC4, 0x04, 0xA3, 0x9C, 0x65, 0x89, 0x16, 0x9E,
                0x65, 0xC4, 0x1E, 0x9C, 0x65, 0xC7, 0x07, 0xAF, 0x65, 0xC6, 0x47, 0x75, 0x01, 0xC6, 0x47, 0x74,
                0x00, 0x5F, 0x5E, 0xC9, 0xCB, 0x90, 0x90
            )
        )
        LegacyPatchedFixupState = 'Any'
        OriginalPatterns = @(
            @('A0', '4F', '60', 'B4', '00', 'F7', 'D8', '1B', 'C0', '40', 'A2', '4F', '60', '80', '3E', '4F', '60', '00', '74', '47')
        )
        Fixup = @{
            OperandOffset = 0xC9753
            OriginalTargetSeg = 107
            OriginalTargetOffset = 0x0046
            PatchedTargetSeg = 130
            PatchedTargetOffset = 0x0000
        }
    }
    DebuggerCallback = @{
        Label = 'legacy secondary call cleanup'
        Offset = 0xC975D
        Original = [byte[]](0xFF, 0xFF, 0x00, 0x00)
        Patched = [byte[]](0xFF, 0xFF, 0x00, 0x00)
        OriginalPatterns = @(
            @('FF', 'FF', '00', '00')
        )
        Fixup = @{
            OperandOffset = 0xC975D
            OriginalTargetSeg = 101
            OriginalTargetOffset = 0x1588
            PatchedTargetSeg = 101
            PatchedTargetOffset = 0x1588
        }
    }
    PrivateBreakpointMethod0 = @{
        Label = 'private break callback slot'
        Offset = 0xEA328
        Original = [byte[]](0xFF, 0xFF, 0x00, 0x00)
        Patched = [byte[]](0xFF, 0xFF, 0x00, 0x00)
        OriginalPatterns = @(
            @('FF', 'FF', '00', '00')
        )
        Fixup = @{
            OperandOffset = 0xEA328
            OriginalTargetSeg = 133
            OriginalTargetOffset = 0x1162
            PatchedTargetSeg = 117
            PatchedTargetOffset = 0x0086
        }
    }
    PrivateBreakpointMethod1 = @{
        Label = 'private helper callback slot'
        Offset = 0xEA32C
        Original = [byte[]](0xFF, 0xFF, 0x00, 0x00)
        Patched = [byte[]](0xFF, 0xFF, 0x00, 0x00)
        OriginalPatterns = @(
            @('FF', 'FF', '00', '00')
        )
        Fixup = @{
            OperandOffset = 0xEA32C
            OriginalTargetSeg = 133
            OriginalTargetOffset = 0x1278
            PatchedTargetSeg = 130
            PatchedTargetOffset = 0x0474
        }
    }
    LegacyBreakpointCallback = @{
        Label = 'legacy seg1408 break callback target'
        Offset = 0xEA1AB
        Original = [byte[]](0xFF, 0xFF, 0x00, 0x00)
        Patched = [byte[]](0xFF, 0xFF, 0x00, 0x00)
        OriginalPatterns = @(
            @('FF', 'FF', '00', '00')
        )
        Fixup = @{
            OperandOffset = 0xEA1AB
            OriginalTargetSeg = 130
            OriginalTargetOffset = 0x046F
            PatchedTargetSeg = 117
            PatchedTargetOffset = 0x0086
        }
    }
    CallbackGuardCode = @{
        Label = 'seg1408 break-next dispatch patch'
        Offset = 0xCEAD3
        Original = [byte[]](0x26, 0x8B, 0x1F, 0xFF, 0x1F)
        Patched = [byte[]](0xFF, 0x1E, 0x97, 0x65, 0x90)
        OriginalPatterns = @(
            @('26', '8B', '1F', 'FF', '1F')
        )
    }
    CallbackTargetSlot = @{
        Label = 'break-next private stub target slot'
        Offset = 0xEA197
        Original = [byte[]](0xFF, 0xFF, 0x00, 0x00)
        Patched = [byte[]](0xFF, 0xFF, 0x00, 0x00)
        OriginalPatterns = @(
            @('FF', 'FF', '00', '00')
        )
        Fixup = @{
            OperandOffset = 0xEA197
            OriginalTargetSeg = 5
            OriginalTargetOffset = 0x08D2
            PatchedTargetSeg = 131
            PatchedTargetOffset = 0x2318
        }
    }
    InterpreterBreakCall = @{
        Label = 'interpreter debugger break callsite'
        Offset = 0xCFAB5
        Original = [byte[]](0x9A, 0xFF, 0xFF, 0x00, 0x00)
        Patched = [byte[]](0x9A, 0xFF, 0xFF, 0x00, 0x00)
        OriginalPatterns = @(
            @('9A', 'FF', 'FF', '00', '00')
        )
        Fixup = @{
            OperandOffset = 0xCFAB6
            OriginalTargetSeg = 130
            OriginalTargetOffset = 0x0053
            PatchedTargetSeg = 131
            PatchedTargetOffset = 0x232D
        }
    }
    Hook = @{
        Label = 'Rejected direct cheat hook site'
        Offset = 0x70D75
        Original = [byte[]](0x68, 0x03, 0x01, 0x9A, 0xFF, 0xFF, 0x00, 0x00, 0x83, 0xC4, 0x02)
        Patched = [byte[]](0x68, 0x03, 0x01, 0x9A, 0xFF, 0xFF, 0x00, 0x00, 0x83, 0xC4, 0x02)
        LegacyBadPatched = [byte[]](0x9A, 0x86, 0x9A, 0x0B, 0x00, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90)
        OriginalPatterns = @(
            @('68', '03', '01', '9A', 'FF', 'FF', '00', '00', '83', 'C4', '02')
        )
        Fixup = @{
            OperandOffset = 0x70D79
            OriginalTargetSeg = 92
            OriginalTargetOffset = 0x0476
            PatchedTargetSeg = 117
            PatchedTargetOffset = 0x0086
            RetailSourceSegmentIndex = 39
            RetailChainOffset = 0x2B79
            RetailEntryOffset = 0x71D68
        }
    }
    Wrapper = @{
        Label = 'Rejected current-slot wrapper arg site'
        Offset = 0xB9A8D
        Original = [byte[]](0x6A, 0x01, 0xFF, 0x76, 0x08, 0xFF, 0x76, 0x06)
        Patched = [byte[]](0x6A, 0x01, 0x6A, 0x00, 0x6A, 0x00, 0x90, 0x90)
        OriginalPatterns = @(
            @('6A', '01', 'FF', '76', '08', 'FF', '76', '06')
        )
    }
    LegacyDeferredHook = @{
        Label = 'Rejected deferred-event hook site'
        Offset = 0xC99DD
        Original = [byte[]](0x68, 0x03, 0x01, 0x9A, 0xFF, 0xFF, 0x00, 0x00, 0x83, 0xC4, 0x02)
        Patched = [byte[]](0x68, 0x03, 0x01, 0x9A, 0xFF, 0xFF, 0x00, 0x00, 0x83, 0xC4, 0x02)
        OriginalPatterns = @(
            @('68', '03', '01', '9A', 'FF', 'FF', '00', '00', '83', 'C4', '02')
        )
        Fixup = @{
            OperandOffset = 0xC99E1
            OriginalTargetSeg = 92
            OriginalTargetOffset = 0x0476
            PatchedTargetSeg = 117
            PatchedTargetOffset = 0x020D
        }
    }
    LegacyDeferredWrapper = @{
        Label = 'Rejected modal wrapper arg site'
        Offset = 0xB9C48
        Original = [byte[]](0x6A, 0x00, 0xFF, 0x76, 0x08, 0xFF, 0x76, 0x06)
        Patched = [byte[]](0x6A, 0x00, 0x6A, 0x00, 0x6A, 0x00, 0x90, 0x90)
        OriginalPatterns = @(
            @('6A', '00', 'FF', '76', '08', 'FF', '76', '06')
        )
    }
}

$candidateProfiles = [ordered]@{
    'candidate-o' = @{
        MenuKey = '1'
        Label = 'Candidate O'
        ArmMode = 'interpreter-callsite'
        UiTargetSeg = 117
        UiTargetOffset = 0x020D
        PatchCurrentUnitWrapper = $false
        PatchModalWrapper = $true
        Summary = 'interpreter callsite retarget -> corrected private modal stub with zeroed modal-wrapper args'
    }
    'candidate-p' = @{
        MenuKey = '2'
        Label = 'Candidate P'
        ArmMode = 'interpreter-callsite'
        UiTargetSeg = 117
        UiTargetOffset = 0x0086
        PatchCurrentUnitWrapper = $true
        PatchModalWrapper = $false
        Summary = 'interpreter callsite retarget -> corrected private current-unit stub with zeroed current-slot args'
    }
}

$script:ctrlQPatchedTemplate = [byte[]]$sites.CtrlQDebuggerInit.Patched.Clone()
$script:configuredProfileKey = 'candidate-o'

function Find-ByteSequenceOffset {
    param(
        [byte[]]$Bytes,
        [byte[]]$Pattern
    )

    $lastStart = $Bytes.Length - $Pattern.Length
    for ($start = 0; $start -le $lastStart; $start++) {
        $matched = $true
        for ($index = 0; $index -lt $Pattern.Length; $index++) {
            if ($Bytes[$start + $index] -ne $Pattern[$index]) {
                $matched = $false
                break
            }
        }

        if ($matched) {
            return $start
        }
    }

    throw 'Could not find the private-vtable base immediate inside the Ctrl+Q patch template.'
}

function New-CtrlQPatchedBytes {
    param([string]$ArmMode)

    switch ($ArmMode) {
        'interpreter-callsite' {
            return [byte[]](
                0xA1, 0x9C, 0x65, 0x0B, 0x06, 0x9E, 0x65, 0x74, 0x10, 0xC4, 0x1E,
                0x9C, 0x65, 0xC6, 0x47, 0x75, 0x00, 0xC6, 0x47, 0x74, 0x01, 0x5F,
                0x5E, 0xC9, 0xCB, 0x6A, 0x00, 0x6A, 0x00, 0xE9, 0x25, 0x00, 0x55,
                0x8B, 0xEC, 0xA1, 0x9C, 0x65, 0x39, 0x46, 0x06, 0x75, 0x16, 0xA1,
                0x9E, 0x65, 0x39, 0x46, 0x08, 0x75, 0x0E, 0xC4, 0x5E, 0x06, 0xC7,
                0x47, 0x74, 0x00, 0x00, 0x6A, 0x00, 0x6A, 0x00, 0xEB, 0x0E, 0x5D,
                0xCB, 0x90, 0x90, 0x9A, 0xFF, 0xFF, 0x00, 0x00, 0x83, 0xC4, 0x04,
                0xEB, 0x0A, 0x9A, 0xFF, 0xFF, 0x00, 0x00, 0x83, 0xC4, 0x04, 0x5D,
                0xCB, 0x0B, 0xC2, 0x74, 0x13, 0xA3, 0x9C, 0x65, 0x89, 0x16, 0x9E,
                0x65, 0x89, 0xC3, 0x8E, 0xC2, 0xC6, 0x47, 0x75, 0x00, 0xC6, 0x47,
                0x74, 0x01, 0x5F, 0x5E, 0xC9, 0xCB
            )
        }
        default {
            throw "Unsupported arm mode '$ArmMode'."
        }
    }
}

function Get-ConfiguredCandidateProfile {
    return $candidateProfiles[$script:configuredProfileKey]
}

function Set-ConfiguredCandidateProfile {
    param([string]$ProfileKey)

    if (-not $candidateProfiles.Contains($ProfileKey)) {
        throw "Unknown candidate profile '$ProfileKey'."
    }

    $profile = $candidateProfiles[$ProfileKey]
    $sites.CtrlQDebuggerInit.Patched = New-CtrlQPatchedBytes -ArmMode ([string]$profile.ArmMode)
    $sites.DebuggerCallback.Fixup.PatchedTargetSeg = [int]$profile.UiTargetSeg
    $sites.DebuggerCallback.Fixup.PatchedTargetOffset = [int]$profile.UiTargetOffset
    $script:configuredProfileKey = $ProfileKey
}

function Test-CandidateApplied {
    param(
        [byte[]]$FileBytes,
        [string]$ProfileKey
    )

    $previousProfileKey = $script:configuredProfileKey
    try {
        Set-ConfiguredCandidateProfile -ProfileKey $ProfileKey
        return (
            (Get-SiteState -FileBytes $FileBytes -Site $sites.CtrlQDebuggerInit) -eq 'Patched' -and
            (Get-SiteState -FileBytes $FileBytes -Site $sites.InterpreterBreakCall) -eq 'Patched' -and
            (Get-SiteState -FileBytes $FileBytes -Site $sites.DebuggerCallback) -eq 'Patched' -and
            (Get-SiteState -FileBytes $FileBytes -Site $sites.CallbackGuardCode) -eq 'Original' -and
            (Get-SiteState -FileBytes $FileBytes -Site $sites.CallbackTargetSlot) -eq 'Original' -and
            (Get-SiteState -FileBytes $FileBytes -Site $sites.Wrapper) -eq $(if ($candidateProfiles[$ProfileKey].PatchCurrentUnitWrapper) { 'Patched' } else { 'Original' }) -and
            (Get-SiteState -FileBytes $FileBytes -Site $sites.LegacyDeferredWrapper) -eq $(if ($candidateProfiles[$ProfileKey].PatchModalWrapper) { 'Patched' } else { 'Original' })
        )
    }
    finally {
        Set-ConfiguredCandidateProfile -ProfileKey $previousProfileKey
    }
}

function Get-AppliedCandidateProfileKey {
    param([byte[]]$FileBytes)

    foreach ($profileKey in $candidateProfiles.Keys) {
        if (Test-CandidateApplied -FileBytes $FileBytes -ProfileKey $profileKey) {
            return $profileKey
        }
    }

    return $null
}

Set-ConfiguredCandidateProfile -ProfileKey $script:configuredProfileKey

function Format-HexBytes {
    param([byte[]]$Bytes)

    return (($Bytes | ForEach-Object { $_.ToString('X2') }) -join ' ')
}

function Get-ByteSlice {
    param(
        [byte[]]$Bytes,
        [int]$Offset,
        [int]$Count
    )

    if ($Offset -lt 0 -or ($Offset + $Count) -gt $Bytes.Length) {
        throw "Requested byte range 0x{0:X}-0x{1:X} is outside the file." -f $Offset, ($Offset + $Count - 1)
    }

    $slice = New-Object byte[] $Count
    [Array]::Copy($Bytes, $Offset, $slice, 0, $Count)
    return $slice
}

function Get-U16Le {
    param(
        [byte[]]$Bytes,
        [int]$Offset
    )

    return [BitConverter]::ToUInt16($Bytes, $Offset)
}

function Get-U32Le {
    param(
        [byte[]]$Bytes,
        [int]$Offset
    )

    return [BitConverter]::ToUInt32($Bytes, $Offset)
}

function Set-U16Le {
    param(
        [byte[]]$Bytes,
        [int]$Offset,
        [int]$Value
    )

    $raw = [BitConverter]::GetBytes([UInt16]$Value)
    [Array]::Copy($raw, 0, $Bytes, $Offset, 2)
}

function Test-ByteArrayEqual {
    param(
        [byte[]]$Left,
        [byte[]]$Right
    )

    if ($Left.Length -ne $Right.Length) {
        return $false
    }

    for ($i = 0; $i -lt $Left.Length; $i++) {
        if ($Left[$i] -ne $Right[$i]) {
            return $false
        }
    }

    return $true
}

function Test-BytePatternMatch {
    param(
        [byte[]]$Bytes,
        [object[]]$Pattern
    )

    if ($Bytes.Length -ne $Pattern.Length) {
        return $false
    }

    for ($i = 0; $i -lt $Bytes.Length; $i++) {
        $expected = [string]$Pattern[$i]
        if ($expected -eq '??') {
            continue
        }

        if ($Bytes[$i] -ne [Convert]::ToByte($expected, 16)) {
            return $false
        }
    }

    return $true
}

function Convert-BytesToStoredHex {
    param([byte[]]$Bytes)

    return (($Bytes | ForEach-Object { $_.ToString('X2') }) -join '')
}

function Convert-StoredHexToBytes {
    param([string]$Hex)

    if ([string]::IsNullOrWhiteSpace($Hex)) {
        return $null
    }

    $normalized = $Hex.Replace(' ', '')
    if (($normalized.Length % 2) -ne 0) {
        throw "Invalid stored hex string length: $Hex"
    }

    $result = New-Object byte[] ($normalized.Length / 2)
    for ($i = 0; $i -lt $result.Length; $i++) {
        $result[$i] = [Convert]::ToByte($normalized.Substring($i * 2, 2), 16)
    }

    return $result
}

function Get-HookFixupInfo {
    param(
        [byte[]]$FileBytes,
        [hashtable]$Site
    )

    $neHeaderOffset = [int](Get-U32Le -Bytes $FileBytes -Offset 0x3C)
    $neSignature = Get-ByteSlice -Bytes $FileBytes -Offset $neHeaderOffset -Count 2
    if ($neSignature[0] -ne 0x4E -or $neSignature[1] -ne 0x45) {
        throw 'Executable does not contain a valid NE header at e_lfanew.'
    }

    $numSegments = [int](Get-U16Le -Bytes $FileBytes -Offset ($neHeaderOffset + 0x1C))
    $segmentTableOffset = [int](Get-U16Le -Bytes $FileBytes -Offset ($neHeaderOffset + 0x22)) + $neHeaderOffset
    $alignmentShift = [int](Get-U16Le -Bytes $FileBytes -Offset ($neHeaderOffset + 0x32))

    $operandFileOffset = [int]$Site.Fixup.OperandOffset
    $segmentInfoByIndex = @{}
    $sourceSegment = $null
    for ($index = 1; $index -le $numSegments; $index++) {
        $segmentEntryOffset = $segmentTableOffset + (($index - 1) * 8)
        $sectorOffset = [int](Get-U16Le -Bytes $FileBytes -Offset $segmentEntryOffset)
        if ($sectorOffset -eq 0) {
            continue
        }

        $segmentLength = [int](Get-U16Le -Bytes $FileBytes -Offset ($segmentEntryOffset + 2))
        if ($segmentLength -eq 0) {
            $segmentLength = 0x10000
        }

        $segmentFlags = [int](Get-U16Le -Bytes $FileBytes -Offset ($segmentEntryOffset + 4))
        $segmentFileOffset = [int]($sectorOffset -shl $alignmentShift)
        $segmentInfo = @{
            SegmentIndex = $index
            SegmentEntryOffset = $segmentEntryOffset
            SegmentFileOffset = $segmentFileOffset
            SegmentLength = $segmentLength
            SegmentFlags = $segmentFlags
            HasReloc = (($segmentFlags -band 0x0100) -ne 0)
        }
        $segmentInfoByIndex[$index] = $segmentInfo

        if ($segmentFileOffset -le $operandFileOffset -and $operandFileOffset -lt ($segmentFileOffset + $segmentLength)) {
            $sourceSegment = $segmentInfo
            break
        }
    }

    if ($null -eq $sourceSegment) {
        $fallbackSegmentIndex = [int]$Site.Fixup.RetailSourceSegmentIndex
        $fallbackChainOffset = [int]$Site.Fixup.RetailChainOffset
        if ($segmentInfoByIndex.ContainsKey($fallbackSegmentIndex)) {
            $fallbackSegment = $segmentInfoByIndex[$fallbackSegmentIndex]
            if (($fallbackSegment.SegmentFileOffset + $fallbackChainOffset) -eq $operandFileOffset) {
                $sourceSegment = $fallbackSegment
            }
        }
    }

    if ($null -eq $sourceSegment) {
        throw ("Could not locate the hook operand file offset 0x{0:X} in any NE code segment." -f $operandFileOffset)
    }

    if (-not $sourceSegment.HasReloc) {
        throw 'Hook source segment does not advertise a relocation table.'
    }

    $segmentIndex = [int]$sourceSegment.SegmentIndex
    $segmentFileOffset = [int]$sourceSegment.SegmentFileOffset
    $segmentLength = [int]$sourceSegment.SegmentLength
    $relocTableOffset = $segmentFileOffset + $segmentLength
    $relocCount = [int](Get-U16Le -Bytes $FileBytes -Offset $relocTableOffset)
    $entryOffset = $relocTableOffset + 2
    $chainOffset = $operandFileOffset - $segmentFileOffset

    for ($index = 0; $index -lt $relocCount; $index++) {
        $addrType = $FileBytes[$entryOffset]
        $relType = $FileBytes[$entryOffset + 1]
        $entryChainOffset = Get-U16Le -Bytes $FileBytes -Offset ($entryOffset + 2)
        if ($entryChainOffset -eq $chainOffset) {
            return @{
                SegmentIndex = $segmentIndex
                SegmentFileOffset = $segmentFileOffset
                RelocTableOffset = $relocTableOffset
                EntryOffset = $entryOffset
                EntryIndex = $index
                AddrType = $addrType
                RelType = $relType
                ChainOffset = $entryChainOffset
                TargetSeg = $FileBytes[$entryOffset + 4]
                Reserved = $FileBytes[$entryOffset + 5]
                TargetOffset = Get-U16Le -Bytes $FileBytes -Offset ($entryOffset + 6)
            }
        }

        if ($addrType -eq 3 -and (($relType -band 0x03) -eq 0)) {
            $visited = New-Object 'System.Collections.Generic.HashSet[int]'
            $currentChainOffset = $entryChainOffset
            while ($currentChainOffset -ne 0xFFFF -and $currentChainOffset -lt $segmentLength) {
                if (-not $visited.Add($currentChainOffset)) {
                    break
                }

                if ($currentChainOffset -eq $chainOffset) {
                    return @{
                        SegmentIndex = $segmentIndex
                        SegmentFileOffset = $segmentFileOffset
                        RelocTableOffset = $relocTableOffset
                        EntryOffset = $entryOffset
                        EntryIndex = $index
                        AddrType = $addrType
                        RelType = $relType
                        ChainOffset = $entryChainOffset
                        TargetSeg = $FileBytes[$entryOffset + 4]
                        Reserved = $FileBytes[$entryOffset + 5]
                        TargetOffset = Get-U16Le -Bytes $FileBytes -Offset ($entryOffset + 6)
                    }
                }

                $currentChainOffset = Get-U16Le -Bytes $FileBytes -Offset ($segmentFileOffset + $currentChainOffset)
            }
        }

        $entryOffset += 8
    }

    $fallbackEntryOffset = [int]$Site.Fixup.RetailEntryOffset
    $fallbackChainOffset = [int]$Site.Fixup.RetailChainOffset
    if ($fallbackEntryOffset -ge 0 -and ($fallbackEntryOffset + 7) -lt $FileBytes.Length) {
        $addrType = $FileBytes[$fallbackEntryOffset]
        $relType = $FileBytes[$fallbackEntryOffset + 1]
        $entryChainOffset = [int](Get-U16Le -Bytes $FileBytes -Offset ($fallbackEntryOffset + 2))
        if (
            $sourceSegment.SegmentIndex -eq [int]$Site.Fixup.RetailSourceSegmentIndex -and
            $chainOffset -eq $fallbackChainOffset -and
            $addrType -eq 3 -and
            (($relType -band 0x03) -eq 0) -and
            $entryChainOffset -eq $fallbackChainOffset
        ) {
            return @{
                SegmentIndex = $segmentIndex
                SegmentFileOffset = $segmentFileOffset
                RelocTableOffset = $relocTableOffset
                EntryOffset = $fallbackEntryOffset
                EntryIndex = -1
                AddrType = $addrType
                RelType = $relType
                ChainOffset = $entryChainOffset
                TargetSeg = $FileBytes[$fallbackEntryOffset + 4]
                Reserved = $FileBytes[$fallbackEntryOffset + 5]
                TargetOffset = Get-U16Le -Bytes $FileBytes -Offset ($fallbackEntryOffset + 6)
            }
        }
    }

    throw ("Could not find hook relocation entry for segment {0} chain offset 0x{1:X}." -f $segmentIndex, $chainOffset)
}

function Get-StateData {
    if (-not (Test-Path -LiteralPath $statePath)) {
        return @{}
    }

    $raw = Get-Content -LiteralPath $statePath -Raw
    if ([string]::IsNullOrWhiteSpace($raw)) {
        return @{}
    }

    $parsed = ConvertFrom-Json -InputObject $raw -AsHashtable
    if ($null -eq $parsed) {
        return @{}
    }

    return $parsed
}

function Save-StateData {
    param([hashtable]$StateData)

    $json = ConvertTo-Json -InputObject $StateData -Depth 4
    Set-Content -LiteralPath $statePath -Value $json -Encoding ASCII
}

function Get-SavedOriginalBytes {
    param(
        [hashtable]$StateData,
        [string]$SiteKey,
        [int]$SiteOffset
    )

    if (-not $StateData.ContainsKey($SiteKey)) {
        return $null
    }

    $siteState = $StateData[$SiteKey]
    if ($siteState -isnot [hashtable]) {
        return $null
    }

    if (-not $siteState.ContainsKey('OriginalBytes')) {
        return $null
    }

    if ($siteState.ContainsKey('Offset') -and ([int]$siteState.Offset -ne $SiteOffset)) {
        return $null
    }

    return Convert-StoredHexToBytes -Hex ([string]$siteState.OriginalBytes)
}

function Save-OriginalBytesIfMissing {
    param(
        [hashtable]$StateData,
        [string]$SiteKey,
        [int]$SiteOffset,
        [byte[]]$Bytes
    )

    if ($StateData.ContainsKey($SiteKey) -and ($StateData[$SiteKey] -is [hashtable])) {
        $existing = $StateData[$SiteKey]
        if ($existing.ContainsKey('OriginalBytes') -and $existing.ContainsKey('Offset') -and ([int]$existing.Offset -eq $SiteOffset)) {
            return $false
        }
    }

    $StateData[$SiteKey] = @{
        Offset = $SiteOffset
        OriginalBytes = Convert-BytesToStoredHex -Bytes $Bytes
    }
    return $true
}

function Get-SiteState {
    param(
        [byte[]]$FileBytes,
        [hashtable]$Site
    )

    $current = Get-ByteSlice -Bytes $FileBytes -Offset $Site.Offset -Count $Site.Original.Length
    if ($Site.ContainsKey('Fixup')) {
        $fixupInfo = Get-HookFixupInfo -FileBytes $FileBytes -Site $Site
        $isFixupOriginal = ($fixupInfo.TargetSeg -eq $Site.Fixup.OriginalTargetSeg) -and ($fixupInfo.TargetOffset -eq $Site.Fixup.OriginalTargetOffset)
        $isFixupPatched = ($fixupInfo.TargetSeg -eq $Site.Fixup.PatchedTargetSeg) -and ($fixupInfo.TargetOffset -eq $Site.Fixup.PatchedTargetOffset)

        if ($Site.ContainsKey('LegacyBadPatched') -and (Test-ByteArrayEqual -Left $current -Right $Site.LegacyBadPatched) -and $isFixupOriginal) {
            return 'LegacyBadPatch'
        }

        if ((Test-ByteArrayEqual -Left $current -Right $Site.Patched) -and $isFixupPatched) {
            return 'Patched'
        }

        if ((Test-ByteArrayEqual -Left $current -Right $Site.Original) -and $isFixupOriginal) {
            return 'Original'
        }

        foreach ($pattern in $Site.OriginalPatterns) {
            if ((Test-BytePatternMatch -Bytes $current -Pattern $pattern) -and $isFixupOriginal) {
                return 'Original'
            }
        }

        $legacyCandidates = @()
        if ($Site.ContainsKey('LegacyPatched')) {
            $legacyCandidates += ,([byte[]]$Site.LegacyPatched)
        }
        if ($Site.ContainsKey('LegacyPatchedVariants')) {
            $legacyCandidates += $Site.LegacyPatchedVariants
        }

        foreach ($legacyCandidate in $legacyCandidates) {
            if (Test-ByteArrayEqual -Left $current -Right $legacyCandidate) {
                $legacyFixupState = if ($Site.ContainsKey('LegacyPatchedFixupState')) { [string]$Site.LegacyPatchedFixupState } else { 'Patched' }
                if (
                    ($legacyFixupState -eq 'Patched' -and $isFixupPatched) -or
                    ($legacyFixupState -eq 'Original' -and $isFixupOriginal) -or
                    ($legacyFixupState -eq 'Any' -and ($isFixupPatched -or $isFixupOriginal))
                ) {
                    return 'LegacyPatched'
                }
            }
        }

        return 'Unknown'
    }

    if (Test-ByteArrayEqual -Left $current -Right $Site.Patched) {
        return 'Patched'
    }

    if (Test-ByteArrayEqual -Left $current -Right $Site.Original) {
        return 'Original'
    }

    foreach ($pattern in $Site.OriginalPatterns) {
        if (Test-BytePatternMatch -Bytes $current -Pattern $pattern) {
            return 'Original'
        }
    }

    return 'Unknown'
}

function Assert-SiteStateKnown {
    param(
        [byte[]]$FileBytes,
        [hashtable]$Site
    )

    $state = Get-SiteState -FileBytes $FileBytes -Site $Site
    if ($state -eq 'Unknown') {
        $current = Get-ByteSlice -Bytes $FileBytes -Offset $Site.Offset -Count $Site.Original.Length
        throw (
            "{0} at file offset 0x{1:X} does not match either expected byte sequence.`nCurrent : {2}`nOriginal: {3}`nPatched : {4}`n`nRefusing to modify an unknown executable state." -f
            $Site.Label,
            $Site.Offset,
            (Format-HexBytes -Bytes $current),
            (Format-HexBytes -Bytes $Site.Original),
            (Format-HexBytes -Bytes $Site.Patched)
        )
    }
}

function Set-ByteSlice {
    param(
        [byte[]]$Bytes,
        [int]$Offset,
        [byte[]]$Value
    )

    [Array]::Copy($Value, 0, $Bytes, $Offset, $Value.Length)
}

function Show-Status {
    param([byte[]]$FileBytes)

    $selectedProfile = Get-ConfiguredCandidateProfile
    $appliedProfileKey = Get-AppliedCandidateProfileKey -FileBytes $FileBytes
    $appliedProfile = if ($null -ne $appliedProfileKey) { $candidateProfiles[$appliedProfileKey] } else { $null }

    $ctrlQState = Get-SiteState -FileBytes $FileBytes -Site $sites.CtrlQDebuggerInit
    $interpreterCallState = Get-SiteState -FileBytes $FileBytes -Site $sites.InterpreterBreakCall
    $privateDispatchState = Get-SiteState -FileBytes $FileBytes -Site $sites.DebuggerCallback
    $callbackGuardState = Get-SiteState -FileBytes $FileBytes -Site $sites.CallbackGuardCode
    $callbackTargetState = Get-SiteState -FileBytes $FileBytes -Site $sites.CallbackTargetSlot
    $hookState = Get-SiteState -FileBytes $FileBytes -Site $sites.Hook
    $wrapperState = Get-SiteState -FileBytes $FileBytes -Site $sites.Wrapper
    $deferredHookState = Get-SiteState -FileBytes $FileBytes -Site $sites.LegacyDeferredHook
    $deferredWrapperState = Get-SiteState -FileBytes $FileBytes -Site $sites.LegacyDeferredWrapper

    Write-Host ''
    Write-Host 'CRUSADER.EXE patch status'
    Write-Host '------------------------'
    Write-Host ("EXE: {0}" -f $exePath)
    Write-Host ("Selected candidate : {0} ({1})" -f $selectedProfile.Label, $selectedProfile.Summary)
    if ($null -ne $appliedProfile) {
        Write-Host ("Applied candidate  : {0} ({1})" -f $appliedProfile.Label, $appliedProfile.Summary)
    }
    elseif ($ctrlQState -eq 'Original') {
        Write-Host 'Applied candidate  : Retail/original'
    }
    else {
        Write-Host 'Applied candidate  : Unknown'
    }
    Write-Host ("0x410 init body     @ 0x{0:X}: {1}" -f $sites.CtrlQDebuggerInit.Offset, $ctrlQState)
    Write-Host ("Interpreter call    @ 0x{0:X}: {1}" -f $sites.InterpreterBreakCall.Offset, $interpreterCallState)
    Write-Host ("Private UI call     @ 0x{0:X}: {1}" -f $sites.DebuggerCallback.Offset, $privateDispatchState)
    Write-Host ("Legacy break hook   @ 0x{0:X}: {1}" -f $sites.CallbackGuardCode.Offset, $callbackGuardState)
    Write-Host ("Legacy target slot  @ 0x{0:X}: {1}" -f $sites.CallbackTargetSlot.Offset, $callbackTargetState)
    Write-Host ("Current-unit args   @ 0x{0:X}: {1}" -f $sites.Wrapper.Offset, $wrapperState)
    Write-Host ("Modal wrapper args  @ 0x{0:X}: {1}" -f $sites.LegacyDeferredWrapper.Offset, $deferredWrapperState)
    Write-Host ("Deferred hook cleanup @ 0x{0:X}: {1}" -f $sites.LegacyDeferredHook.Offset, $deferredHookState)
    Write-Host ("Direct hook cleanup @ 0x{0:X}: {1}" -f $sites.Hook.Offset, $hookState)
    Write-Host ''
    foreach ($profileKey in $candidateProfiles.Keys) {
        $profile = $candidateProfiles[$profileKey]
        $marker = if ($appliedProfileKey -eq $profileKey) { 'applied' } else { 'ready' }
        Write-Host ("{0}. Apply {1} [{2}] {3}" -f $profile.MenuKey, $profile.Label, $marker, $profile.Summary)
    }
    Write-Host '3. Restore original bytes'
    Write-Host '4. Exit'
    Write-Host ''
}

function Set-DesiredState {
    param(
        [bool]$CtrlQPatched,
        [string]$Label,
        [string]$ProfileKey
    )

    $fileBytes = [System.IO.File]::ReadAllBytes($exePath)

    $appliedProfileKey = Get-AppliedCandidateProfileKey -FileBytes $fileBytes
    $profileKeyForStateCheck = if ($null -ne $appliedProfileKey) { $appliedProfileKey } elseif ($CtrlQPatched) { $ProfileKey } else { $script:configuredProfileKey }
    $profileKeyForWrite = if ($CtrlQPatched) { $ProfileKey } else { $profileKeyForStateCheck }

    if ([string]::IsNullOrWhiteSpace($profileKeyForStateCheck)) {
        throw 'No candidate profile is available for state validation.'
    }

    Set-ConfiguredCandidateProfile -ProfileKey $profileKeyForStateCheck

    Assert-SiteStateKnown -FileBytes $fileBytes -Site $sites.CtrlQDebuggerInit
    Assert-SiteStateKnown -FileBytes $fileBytes -Site $sites.InterpreterBreakCall
    Assert-SiteStateKnown -FileBytes $fileBytes -Site $sites.DebuggerCallback
    Assert-SiteStateKnown -FileBytes $fileBytes -Site $sites.CallbackGuardCode
    Assert-SiteStateKnown -FileBytes $fileBytes -Site $sites.CallbackTargetSlot
    Assert-SiteStateKnown -FileBytes $fileBytes -Site $sites.PrivateBreakpointMethod0
    Assert-SiteStateKnown -FileBytes $fileBytes -Site $sites.PrivateBreakpointMethod1
    Assert-SiteStateKnown -FileBytes $fileBytes -Site $sites.LegacyBreakpointCallback
    Assert-SiteStateKnown -FileBytes $fileBytes -Site $sites.Hook
    Assert-SiteStateKnown -FileBytes $fileBytes -Site $sites.Wrapper
    Assert-SiteStateKnown -FileBytes $fileBytes -Site $sites.LegacyDeferredHook
    Assert-SiteStateKnown -FileBytes $fileBytes -Site $sites.LegacyDeferredWrapper

    Set-ConfiguredCandidateProfile -ProfileKey $profileKeyForWrite
    $activeProfile = Get-ConfiguredCandidateProfile

    $ctrlQFixupInfo = Get-HookFixupInfo -FileBytes $fileBytes -Site $sites.CtrlQDebuggerInit
    $interpreterBreakCallFixupInfo = Get-HookFixupInfo -FileBytes $fileBytes -Site $sites.InterpreterBreakCall
    $debuggerCallbackFixupInfo = Get-HookFixupInfo -FileBytes $fileBytes -Site $sites.DebuggerCallback
    $callbackTargetFixupInfo = Get-HookFixupInfo -FileBytes $fileBytes -Site $sites.CallbackTargetSlot
    $privateMethod0FixupInfo = Get-HookFixupInfo -FileBytes $fileBytes -Site $sites.PrivateBreakpointMethod0
    $privateMethod1FixupInfo = Get-HookFixupInfo -FileBytes $fileBytes -Site $sites.PrivateBreakpointMethod1
    $legacyCallbackFixupInfo = Get-HookFixupInfo -FileBytes $fileBytes -Site $sites.LegacyBreakpointCallback
    $hookFixupInfo = Get-HookFixupInfo -FileBytes $fileBytes -Site $sites.Hook
    $legacyDeferredHookFixupInfo = Get-HookFixupInfo -FileBytes $fileBytes -Site $sites.LegacyDeferredHook
    $ctrlQBytes = if ($CtrlQPatched) { $sites.CtrlQDebuggerInit.Patched } else { $sites.CtrlQDebuggerInit.Original }
    $ctrlQTargetSeg = if ($CtrlQPatched) { [int]$sites.CtrlQDebuggerInit.Fixup.PatchedTargetSeg } else { [int]$sites.CtrlQDebuggerInit.Fixup.OriginalTargetSeg }
    $ctrlQTargetOffset = if ($CtrlQPatched) { [int]$sites.CtrlQDebuggerInit.Fixup.PatchedTargetOffset } else { [int]$sites.CtrlQDebuggerInit.Fixup.OriginalTargetOffset }
    $interpreterBreakCallBytes = $sites.InterpreterBreakCall.Original
    $interpreterBreakCallSeg = [int]$sites.InterpreterBreakCall.Fixup.OriginalTargetSeg
    $interpreterBreakCallOffset = [int]$sites.InterpreterBreakCall.Fixup.OriginalTargetOffset
    if ($CtrlQPatched) {
        $interpreterBreakCallBytes = $sites.InterpreterBreakCall.Patched
        $interpreterBreakCallSeg = [int]$sites.InterpreterBreakCall.Fixup.PatchedTargetSeg
        $interpreterBreakCallOffset = [int]$sites.InterpreterBreakCall.Fixup.PatchedTargetOffset
    }
    $debuggerCallbackBytes = $sites.DebuggerCallback.Original
    $debuggerCallbackSeg = [int]$sites.DebuggerCallback.Fixup.OriginalTargetSeg
    $debuggerCallbackOffset = [int]$sites.DebuggerCallback.Fixup.OriginalTargetOffset
    if ($CtrlQPatched) {
        $debuggerCallbackBytes = $sites.DebuggerCallback.Patched
        $debuggerCallbackSeg = [int]$sites.DebuggerCallback.Fixup.PatchedTargetSeg
        $debuggerCallbackOffset = [int]$sites.DebuggerCallback.Fixup.PatchedTargetOffset
    }
    $callbackGuardBytes = $sites.CallbackGuardCode.Original
    $callbackTargetBytes = $sites.CallbackTargetSlot.Original
    $callbackTargetSeg = [int]$sites.CallbackTargetSlot.Fixup.OriginalTargetSeg
    $callbackTargetOffset = [int]$sites.CallbackTargetSlot.Fixup.OriginalTargetOffset
    $privateMethod0Bytes = $sites.PrivateBreakpointMethod0.Original
    $privateMethod0TargetSeg = [int]$sites.PrivateBreakpointMethod0.Fixup.OriginalTargetSeg
    $privateMethod0TargetOffset = [int]$sites.PrivateBreakpointMethod0.Fixup.OriginalTargetOffset
    $privateMethod1Bytes = $sites.PrivateBreakpointMethod1.Original
    $privateMethod1TargetSeg = [int]$sites.PrivateBreakpointMethod1.Fixup.OriginalTargetSeg
    $privateMethod1TargetOffset = [int]$sites.PrivateBreakpointMethod1.Fixup.OriginalTargetOffset
    $legacyCallbackBytes = $sites.LegacyBreakpointCallback.Original
    $legacyCallbackTargetSeg = [int]$sites.LegacyBreakpointCallback.Fixup.OriginalTargetSeg
    $legacyCallbackTargetOffset = [int]$sites.LegacyBreakpointCallback.Fixup.OriginalTargetOffset
    $hookBytes = $sites.Hook.Original
    $hookTargetSeg = [int]$sites.Hook.Fixup.OriginalTargetSeg
    $hookTargetOffset = [int]$sites.Hook.Fixup.OriginalTargetOffset
    $hookReserved = 0
    $wrapperBytes = if ($CtrlQPatched -and $activeProfile.PatchCurrentUnitWrapper) { $sites.Wrapper.Patched } else { $sites.Wrapper.Original }
    $legacyDeferredHookBytes = $sites.LegacyDeferredHook.Original
    $legacyDeferredHookTargetSeg = [int]$sites.LegacyDeferredHook.Fixup.OriginalTargetSeg
    $legacyDeferredHookTargetOffset = [int]$sites.LegacyDeferredHook.Fixup.OriginalTargetOffset
    $legacyDeferredHookReserved = 0
    $legacyDeferredWrapperBytes = if ($CtrlQPatched -and $activeProfile.PatchModalWrapper) { $sites.LegacyDeferredWrapper.Patched } else { $sites.LegacyDeferredWrapper.Original }

    Set-ByteSlice -Bytes $fileBytes -Offset $sites.CtrlQDebuggerInit.Offset -Value $ctrlQBytes
    $fileBytes[$ctrlQFixupInfo.EntryOffset + 4] = [byte]$ctrlQTargetSeg
    $fileBytes[$ctrlQFixupInfo.EntryOffset + 5] = 0
    Set-U16Le -Bytes $fileBytes -Offset ($ctrlQFixupInfo.EntryOffset + 6) -Value $ctrlQTargetOffset
    Set-ByteSlice -Bytes $fileBytes -Offset $sites.InterpreterBreakCall.Offset -Value $interpreterBreakCallBytes
    $fileBytes[$interpreterBreakCallFixupInfo.EntryOffset + 4] = [byte]$interpreterBreakCallSeg
    $fileBytes[$interpreterBreakCallFixupInfo.EntryOffset + 5] = 0
    Set-U16Le -Bytes $fileBytes -Offset ($interpreterBreakCallFixupInfo.EntryOffset + 6) -Value $interpreterBreakCallOffset
    Set-ByteSlice -Bytes $fileBytes -Offset $sites.DebuggerCallback.Offset -Value $debuggerCallbackBytes
    $fileBytes[$debuggerCallbackFixupInfo.EntryOffset + 4] = [byte]$debuggerCallbackSeg
    $fileBytes[$debuggerCallbackFixupInfo.EntryOffset + 5] = 0
    Set-U16Le -Bytes $fileBytes -Offset ($debuggerCallbackFixupInfo.EntryOffset + 6) -Value $debuggerCallbackOffset
    Set-ByteSlice -Bytes $fileBytes -Offset $sites.CallbackGuardCode.Offset -Value $callbackGuardBytes
    Set-ByteSlice -Bytes $fileBytes -Offset $sites.CallbackTargetSlot.Offset -Value $callbackTargetBytes
    $fileBytes[$callbackTargetFixupInfo.EntryOffset + 4] = [byte]$callbackTargetSeg
    $fileBytes[$callbackTargetFixupInfo.EntryOffset + 5] = 0
    Set-U16Le -Bytes $fileBytes -Offset ($callbackTargetFixupInfo.EntryOffset + 6) -Value $callbackTargetOffset
    Set-ByteSlice -Bytes $fileBytes -Offset $sites.PrivateBreakpointMethod0.Offset -Value $privateMethod0Bytes
    $fileBytes[$privateMethod0FixupInfo.EntryOffset + 4] = [byte]$privateMethod0TargetSeg
    $fileBytes[$privateMethod0FixupInfo.EntryOffset + 5] = 0
    Set-U16Le -Bytes $fileBytes -Offset ($privateMethod0FixupInfo.EntryOffset + 6) -Value $privateMethod0TargetOffset
    Set-ByteSlice -Bytes $fileBytes -Offset $sites.PrivateBreakpointMethod1.Offset -Value $privateMethod1Bytes
    $fileBytes[$privateMethod1FixupInfo.EntryOffset + 4] = [byte]$privateMethod1TargetSeg
    $fileBytes[$privateMethod1FixupInfo.EntryOffset + 5] = 0
    Set-U16Le -Bytes $fileBytes -Offset ($privateMethod1FixupInfo.EntryOffset + 6) -Value $privateMethod1TargetOffset
    Set-ByteSlice -Bytes $fileBytes -Offset $sites.LegacyBreakpointCallback.Offset -Value $legacyCallbackBytes
    $fileBytes[$legacyCallbackFixupInfo.EntryOffset + 4] = [byte]$legacyCallbackTargetSeg
    $fileBytes[$legacyCallbackFixupInfo.EntryOffset + 5] = 0
    Set-U16Le -Bytes $fileBytes -Offset ($legacyCallbackFixupInfo.EntryOffset + 6) -Value $legacyCallbackTargetOffset
    Set-ByteSlice -Bytes $fileBytes -Offset $sites.Hook.Offset -Value $hookBytes
    $fileBytes[$hookFixupInfo.EntryOffset + 4] = [byte]$hookTargetSeg
    $fileBytes[$hookFixupInfo.EntryOffset + 5] = [byte]$hookReserved
    Set-U16Le -Bytes $fileBytes -Offset ($hookFixupInfo.EntryOffset + 6) -Value $hookTargetOffset
    Set-ByteSlice -Bytes $fileBytes -Offset $sites.Wrapper.Offset -Value $wrapperBytes
    Set-ByteSlice -Bytes $fileBytes -Offset $sites.LegacyDeferredHook.Offset -Value $legacyDeferredHookBytes
    $fileBytes[$legacyDeferredHookFixupInfo.EntryOffset + 4] = [byte]$legacyDeferredHookTargetSeg
    $fileBytes[$legacyDeferredHookFixupInfo.EntryOffset + 5] = [byte]$legacyDeferredHookReserved
    Set-U16Le -Bytes $fileBytes -Offset ($legacyDeferredHookFixupInfo.EntryOffset + 6) -Value $legacyDeferredHookTargetOffset
    Set-ByteSlice -Bytes $fileBytes -Offset $sites.LegacyDeferredWrapper.Offset -Value $legacyDeferredWrapperBytes

    [System.IO.File]::WriteAllBytes($exePath, $fileBytes)

    $verifyBytes = [System.IO.File]::ReadAllBytes($exePath)
    $ctrlQState = Get-SiteState -FileBytes $verifyBytes -Site $sites.CtrlQDebuggerInit
    $interpreterCallState = Get-SiteState -FileBytes $verifyBytes -Site $sites.InterpreterBreakCall
    $privateDispatchState = Get-SiteState -FileBytes $verifyBytes -Site $sites.DebuggerCallback
    $callbackGuardState = Get-SiteState -FileBytes $verifyBytes -Site $sites.CallbackGuardCode
    $callbackTargetState = Get-SiteState -FileBytes $verifyBytes -Site $sites.CallbackTargetSlot
    $hookState = Get-SiteState -FileBytes $verifyBytes -Site $sites.Hook
    $wrapperState = Get-SiteState -FileBytes $verifyBytes -Site $sites.Wrapper
    $deferredHookState = Get-SiteState -FileBytes $verifyBytes -Site $sites.LegacyDeferredHook
    $deferredWrapperState = Get-SiteState -FileBytes $verifyBytes -Site $sites.LegacyDeferredWrapper
    $verifiedCtrlQFixupInfo = Get-HookFixupInfo -FileBytes $verifyBytes -Site $sites.CtrlQDebuggerInit
    $verifiedInterpreterBreakCallFixupInfo = Get-HookFixupInfo -FileBytes $verifyBytes -Site $sites.InterpreterBreakCall
    $verifiedDebuggerCallbackFixupInfo = Get-HookFixupInfo -FileBytes $verifyBytes -Site $sites.DebuggerCallback
    $verifiedCallbackTargetFixupInfo = Get-HookFixupInfo -FileBytes $verifyBytes -Site $sites.CallbackTargetSlot
    $verifiedPrivateMethod0FixupInfo = Get-HookFixupInfo -FileBytes $verifyBytes -Site $sites.PrivateBreakpointMethod0
    $verifiedPrivateMethod1FixupInfo = Get-HookFixupInfo -FileBytes $verifyBytes -Site $sites.PrivateBreakpointMethod1
    $verifiedLegacyCallbackFixupInfo = Get-HookFixupInfo -FileBytes $verifyBytes -Site $sites.LegacyBreakpointCallback
    $verifiedHookFixupInfo = Get-HookFixupInfo -FileBytes $verifyBytes -Site $sites.Hook
    $verifiedLegacyDeferredHookFixupInfo = Get-HookFixupInfo -FileBytes $verifyBytes -Site $sites.LegacyDeferredHook
    $verifiedCtrlQBytes = Get-ByteSlice -Bytes $verifyBytes -Offset $sites.CtrlQDebuggerInit.Offset -Count $ctrlQBytes.Length
    $verifiedInterpreterBreakCallBytes = Get-ByteSlice -Bytes $verifyBytes -Offset $sites.InterpreterBreakCall.Offset -Count $interpreterBreakCallBytes.Length
    $verifiedDebuggerCallbackBytes = Get-ByteSlice -Bytes $verifyBytes -Offset $sites.DebuggerCallback.Offset -Count $debuggerCallbackBytes.Length
    $verifiedCallbackGuardBytes = Get-ByteSlice -Bytes $verifyBytes -Offset $sites.CallbackGuardCode.Offset -Count $callbackGuardBytes.Length
    $verifiedCallbackTargetBytes = Get-ByteSlice -Bytes $verifyBytes -Offset $sites.CallbackTargetSlot.Offset -Count $callbackTargetBytes.Length
    $verifiedPrivateMethod0Bytes = Get-ByteSlice -Bytes $verifyBytes -Offset $sites.PrivateBreakpointMethod0.Offset -Count $privateMethod0Bytes.Length
    $verifiedPrivateMethod1Bytes = Get-ByteSlice -Bytes $verifyBytes -Offset $sites.PrivateBreakpointMethod1.Offset -Count $privateMethod1Bytes.Length
    $verifiedLegacyCallbackBytes = Get-ByteSlice -Bytes $verifyBytes -Offset $sites.LegacyBreakpointCallback.Offset -Count $legacyCallbackBytes.Length
    $verifiedHookBytes = Get-ByteSlice -Bytes $verifyBytes -Offset $sites.Hook.Offset -Count $hookBytes.Length
    $verifiedWrapperBytes = Get-ByteSlice -Bytes $verifyBytes -Offset $sites.Wrapper.Offset -Count $wrapperBytes.Length
    $verifiedLegacyDeferredHookBytes = Get-ByteSlice -Bytes $verifyBytes -Offset $sites.LegacyDeferredHook.Offset -Count $legacyDeferredHookBytes.Length
    $verifiedLegacyDeferredWrapperBytes = Get-ByteSlice -Bytes $verifyBytes -Offset $sites.LegacyDeferredWrapper.Offset -Count $legacyDeferredWrapperBytes.Length

    if (-not (Test-ByteArrayEqual -Left $verifiedCtrlQBytes -Right $ctrlQBytes)) {
        throw 'Ctrl+Q debugger-init body verification failed after write.'
    }

    if ($verifiedCtrlQFixupInfo.TargetSeg -ne $ctrlQTargetSeg -or $verifiedCtrlQFixupInfo.TargetOffset -ne $ctrlQTargetOffset) {
        throw 'Ctrl+Q debugger-init relocation verification failed after write.'
    }

    if (-not (Test-ByteArrayEqual -Left $verifiedInterpreterBreakCallBytes -Right $interpreterBreakCallBytes)) {
        throw 'Interpreter debugger callsite verification failed after write.'
    }

    if ($verifiedInterpreterBreakCallFixupInfo.TargetSeg -ne $interpreterBreakCallSeg -or $verifiedInterpreterBreakCallFixupInfo.TargetOffset -ne $interpreterBreakCallOffset) {
        throw 'Interpreter debugger callsite relocation verification failed after write.'
    }

    if (-not (Test-ByteArrayEqual -Left $verifiedDebuggerCallbackBytes -Right $debuggerCallbackBytes)) {
        throw 'Private debugger UI call verification failed after write.'
    }

    if ($verifiedDebuggerCallbackFixupInfo.TargetSeg -ne $debuggerCallbackSeg -or $verifiedDebuggerCallbackFixupInfo.TargetOffset -ne $debuggerCallbackOffset) {
        throw 'Private debugger UI call relocation verification failed after write.'
    }

    if (-not (Test-ByteArrayEqual -Left $verifiedCallbackGuardBytes -Right $callbackGuardBytes)) {
        throw 'Break-next dispatch patch verification failed after write.'
    }

    if (-not (Test-ByteArrayEqual -Left $verifiedCallbackTargetBytes -Right $callbackTargetBytes)) {
        throw 'Guarded callback target slot bytes verification failed after write.'
    }

    if ($verifiedCallbackTargetFixupInfo.TargetSeg -ne $callbackTargetSeg -or $verifiedCallbackTargetFixupInfo.TargetOffset -ne $callbackTargetOffset) {
        throw 'Guarded callback target relocation verification failed after write.'
    }

    if (-not (Test-ByteArrayEqual -Left $verifiedPrivateMethod0Bytes -Right $privateMethod0Bytes)) {
        throw 'Private vtable method-0 bytes verification failed after write.'
    }

    if ($verifiedPrivateMethod0FixupInfo.TargetSeg -ne $privateMethod0TargetSeg -or $verifiedPrivateMethod0FixupInfo.TargetOffset -ne $privateMethod0TargetOffset) {
        throw 'Private vtable method-0 relocation verification failed after write.'
    }

    if (-not (Test-ByteArrayEqual -Left $verifiedPrivateMethod1Bytes -Right $privateMethod1Bytes)) {
        throw 'Private vtable method-1 bytes verification failed after write.'
    }

    if ($verifiedPrivateMethod1FixupInfo.TargetSeg -ne $privateMethod1TargetSeg -or $verifiedPrivateMethod1FixupInfo.TargetOffset -ne $privateMethod1TargetOffset) {
        throw 'Private vtable method-1 relocation verification failed after write.'
    }

    if (-not (Test-ByteArrayEqual -Left $verifiedLegacyCallbackBytes -Right $legacyCallbackBytes)) {
        throw 'Legacy callback cleanup bytes verification failed after write.'
    }

    if ($verifiedLegacyCallbackFixupInfo.TargetSeg -ne $legacyCallbackTargetSeg -or $verifiedLegacyCallbackFixupInfo.TargetOffset -ne $legacyCallbackTargetOffset) {
        throw 'Legacy callback cleanup relocation verification failed after write.'
    }

    if (-not (Test-ByteArrayEqual -Left $verifiedHookBytes -Right $hookBytes)) {
        throw 'Hook-site verification failed after write.'
    }

    if ($verifiedHookFixupInfo.TargetSeg -ne $hookTargetSeg -or $verifiedHookFixupInfo.TargetOffset -ne $hookTargetOffset) {
        throw 'Hook relocation verification failed after write.'
    }

    if (-not (Test-ByteArrayEqual -Left $verifiedWrapperBytes -Right $wrapperBytes)) {
        throw 'Wrapper-site verification failed after write.'
    }

    if (-not (Test-ByteArrayEqual -Left $verifiedLegacyDeferredHookBytes -Right $legacyDeferredHookBytes)) {
        throw 'Rejected deferred-event hook cleanup verification failed after write.'
    }

    if ($verifiedLegacyDeferredHookFixupInfo.TargetSeg -ne $legacyDeferredHookTargetSeg -or $verifiedLegacyDeferredHookFixupInfo.TargetOffset -ne $legacyDeferredHookTargetOffset) {
        throw 'Rejected deferred-event relocation cleanup verification failed after write.'
    }

    if (-not (Test-ByteArrayEqual -Left $verifiedLegacyDeferredWrapperBytes -Right $legacyDeferredWrapperBytes)) {
        throw 'Rejected modal-wrapper cleanup verification failed after write.'
    }

    Write-Host ''
    Write-Host ("Applied: {0}" -f $Label)
    Write-Host ("0x410 init body     @ 0x{0:X}: {1}" -f $sites.CtrlQDebuggerInit.Offset, $ctrlQState)
    Write-Host ("Interpreter call    @ 0x{0:X}: {1}" -f $sites.InterpreterBreakCall.Offset, $interpreterCallState)
    Write-Host ("Private UI call     @ 0x{0:X}: {1}" -f $sites.DebuggerCallback.Offset, $privateDispatchState)
    Write-Host ("Legacy break hook   @ 0x{0:X}: {1}" -f $sites.CallbackGuardCode.Offset, $callbackGuardState)
    Write-Host ("Legacy target slot  @ 0x{0:X}: {1}" -f $sites.CallbackTargetSlot.Offset, $callbackTargetState)
    Write-Host ("Current-unit args   @ 0x{0:X}: {1}" -f $sites.Wrapper.Offset, $wrapperState)
    Write-Host ("Modal wrapper args  @ 0x{0:X}: {1}" -f $sites.LegacyDeferredWrapper.Offset, $deferredWrapperState)
    Write-Host ("Deferred hook cleanup @ 0x{0:X}: {1}" -f $sites.LegacyDeferredHook.Offset, $deferredHookState)
    Write-Host ("Direct hook cleanup @ 0x{0:X}: {1}" -f $sites.Hook.Offset, $hookState)
    Write-Host ''
    Write-Host 'What this means:'
    Write-Host '- Ctrl+Q still goes through the real 0x410 keyboard lane and keeps the original 0x844 cheat gate.'
    if ($CtrlQPatched) {
        Write-Host ('- The 0x410 body now correctly handles both cases: it arms an existing seg1408 debugger-state object in place, or lazily creates one and stores it at 0x659c/0x659e before arming break-next mode (+0x74=1, +0x75=0).')
        Write-Host ("- {0} stops using the unsafe 1478:6597 data slot entirely and retargets the existing interpreter call at 1418:04b5 straight into the corrected private 13e8:232d stub." -f $activeProfile.Label)
        if ($activeProfile.PatchCurrentUnitWrapper) {
            Write-Host '- The current-unit debugger wrapper at 13a0:0086 has its inherited caller-word pushes zeroed so the callback does not forward the debugger-object pointer as UI arguments.'
        }
        if ($activeProfile.PatchModalWrapper) {
            Write-Host '- The modal debugger wrapper at 13a0:020d has its inherited caller-word pushes zeroed for the same reason.'
        }
    }
    else {
        Write-Host '- All debugger patch changes are restored to the retail byte pattern, including the 0x410 body and the interpreter break call at 1418:04b5.'
        Write-Host '- Older private-vtable and direct/deferred experiment sites are also written back to retail bytes during restore.'
    }
    Write-Host ''
}

function Invoke-MenuChoice {
    param([string]$SelectedChoice)

    switch ($SelectedChoice.Trim().ToLowerInvariant()) {
        '1' {
            Set-DesiredState -CtrlQPatched $true -ProfileKey 'candidate-o' -Label 'Ctrl+Q -> interpreter callsite modal stub patch (Candidate O)'
        }
        '2' {
            Set-DesiredState -CtrlQPatched $true -ProfileKey 'candidate-p' -Label 'Ctrl+Q -> interpreter callsite current-unit stub patch (Candidate P)'
        }
        'candidate-i' {
            Set-DesiredState -CtrlQPatched $true -ProfileKey 'candidate-o' -Label 'Ctrl+Q -> interpreter callsite modal stub patch (Candidate O)'
        }
        'candidate-j' {
            Set-DesiredState -CtrlQPatched $true -ProfileKey 'candidate-p' -Label 'Ctrl+Q -> interpreter callsite current-unit stub patch (Candidate P)'
        }
        'candidate-m' {
            Set-DesiredState -CtrlQPatched $true -ProfileKey 'candidate-o' -Label 'Ctrl+Q -> interpreter callsite modal stub patch (Candidate O)'
        }
        'candidate-n' {
            Set-DesiredState -CtrlQPatched $true -ProfileKey 'candidate-p' -Label 'Ctrl+Q -> interpreter callsite current-unit stub patch (Candidate P)'
        }
        'candidate-o' {
            Set-DesiredState -CtrlQPatched $true -ProfileKey 'candidate-o' -Label 'Ctrl+Q -> interpreter callsite modal stub patch (Candidate O)'
        }
        'candidate-p' {
            Set-DesiredState -CtrlQPatched $true -ProfileKey 'candidate-p' -Label 'Ctrl+Q -> interpreter callsite current-unit stub patch (Candidate P)'
        }
        '3' {
            Set-DesiredState -CtrlQPatched $false -ProfileKey $null -Label 'Restore original bytes'
        }
        'restore' {
            Set-DesiredState -CtrlQPatched $false -ProfileKey $null -Label 'Restore original bytes'
        }
        '4' {
            return $false
        }
        'exit' {
            return $false
        }
        default {
            Write-Warning 'Invalid selection.'
        }
    }

    return $true
}

if (-not (Test-Path -LiteralPath $exePath)) {
    throw "CRUSADER.EXE was not found at '$exePath'. Pass -ExePath to point at the retail install or place the EXE next to this script."
}

if ($PSBoundParameters.ContainsKey('Choice')) {
    [void](Invoke-MenuChoice -SelectedChoice $Choice)
    return
}

:mainloop while ($true) {
    $currentBytes = [System.IO.File]::ReadAllBytes($exePath)
    Show-Status -FileBytes $currentBytes
    $choice = Read-Host 'Select 1-4'
    if ([string]::IsNullOrEmpty($choice)) { break mainloop }

    if (-not (Invoke-MenuChoice -SelectedChoice $choice)) {
        break mainloop
    }
}