@page "/workday"
@page "/workday/{DateStr}"
@attribute [Authorize]
@rendermode InteractiveServer

@inject IWorkDayService WorkDayService
@inject IAppSettingsService AppSettingsService
@inject IItalianFestivitySource FestivitySource
@inject NavigationManager Navigation

<PageTitle>Work Day</PageTitle>

<h1>Work Day Entry</h1>

@if (!loaded)
{
    <p><em>Loading...</em></p>
}
else
{
    <div class="row g-3">
        <div class="col-12 col-md-6 col-lg-4">
            <label class="form-label">Date</label>
            <input type="date" class="form-control" value="@selectedDate.ToString("yyyy-MM-dd")" @onchange="OnDateChanged" />
            @if (isWeekend || isFestivity)
            {
                <div class="mt-1">
                    @if (isWeekend) { <span class="badge bg-danger me-1">Weekend</span> }
                    @if (isFestivity) { <span class="badge bg-warning text-dark">Festivity</span> }
                </div>
            }
        </div>

        <div class="col-12 col-md-6 col-lg-4">
            <label class="form-label">Day Type</label>
            <select class="form-select" value="@selectedDayType" @onchange="OnDayTypeChanged">
                @foreach (var dt in Enum.GetValues<DayType>())
                {
                    <option value="@dt">@dt</option>
                }
            </select>
        </div>

        <div class="col-12 col-md-6 col-lg-4">
            <label class="form-label">Start Time</label>
            <input type="time" class="form-control" value="@startTimeStr" @onchange="OnStartTimeChanged" />
        </div>

        <div class="col-12 col-md-6 col-lg-4">
            <label class="form-label">Actual Exit Time</label>
            <input type="time" class="form-control" value="@actualExitTimeStr" @onchange="OnActualExitChanged" />
            <div class="form-text">Informational only, not used in calculations.</div>
        </div>

        <div class="col-12 col-md-6 col-lg-4">
            <label class="form-label">Extra hours delta</label>
            <input type="number" class="form-control" step="0.25" value="@extraHoursDelta" @onchange="OnExtraDeltaChanged" />
        </div>

        <div class="col-12">
            <label class="form-label">Notes</label>
            <textarea class="form-control" rows="2" @bind="notes"></textarea>
        </div>
    </div>

    <hr />

    <h2 class="h5">Computed values</h2>
    <div class="row g-3">
        <div class="col-6 col-md-4 col-lg-3">
            <label class="form-label text-muted">Projected Exit</label>
            <div class="form-control-plaintext fw-bold">@(projectedExitTime?.ToString("HH:mm") ?? "—")</div>
        </div>
        <div class="col-6 col-md-4 col-lg-3">
            <label class="form-label text-muted">Worked (base)</label>
            <div class="form-control-plaintext fw-bold">@workedHoursBase.ToString("N2")h</div>
        </div>
        <div class="col-6 col-md-4 col-lg-3">
            <label class="form-label text-muted">Worked (final)</label>
            <div class="form-control-plaintext fw-bold">@workedHoursFinal.ToString("N2")h</div>
        </div>
        <div class="col-6 col-md-4 col-lg-3">
            <label class="form-label text-muted">Hours Off</label>
            <div class="form-control-plaintext fw-bold">@hoursOff.ToString("N2")h</div>
        </div>
        <div class="col-6 col-md-4 col-lg-3">
            <label class="form-label text-muted">Gross Income</label>
            <div class="form-control-plaintext fw-bold">€@grossIncome.ToString("N2")</div>
        </div>
        <div class="col-6 col-md-4 col-lg-3">
            <label class="form-label text-muted">Net Income</label>
            <div class="form-control-plaintext fw-bold">€@netIncome.ToString("N2")</div>
        </div>
    </div>

    <div class="d-flex align-items-center gap-2 mt-4">
        <button class="btn btn-primary" @onclick="SaveAsync">Save</button>
        @if (!string.IsNullOrWhiteSpace(statusMessage))
        {
            <span class="text-success">@statusMessage</span>
        }
    </div>
}

@code {
    [Parameter] public string? DateStr { get; set; }

    private bool loaded;
    private DateOnly selectedDate = DateOnly.FromDateTime(DateTime.Today);
    private DayType selectedDayType = DayType.None;
    private string? startTimeStr;
    private string? actualExitTimeStr;
    private decimal extraHoursDelta;
    private string? notes;
    private string? statusMessage;

    // Computed preview
    private TimeOnly? projectedExitTime;
    private decimal workedHoursBase;
    private decimal workedHoursFinal;
    private decimal hoursOff;
    private decimal grossIncome;
    private decimal netIncome;
    private bool isWeekend;
    private bool isFestivity;

    // Loaded from settings
    private AppSettingsDocument settings = new();
    private IReadOnlyCollection<DateOnly> festivities = [];

    protected override async Task OnInitializedAsync()
    {
        if (!string.IsNullOrEmpty(DateStr) && DateOnly.TryParseExact(DateStr, "yyyy-MM-dd", out var parsed))
        {
            selectedDate = parsed;
        }

        settings = await AppSettingsService.GetAsync();
        festivities = FestivitySource.GetFestivities(selectedDate.Year);

        await LoadExistingEntry();
        RecomputeFlags();
        RecomputePreview();
        loaded = true;
    }

    private async Task LoadExistingEntry()
    {
        var existing = await WorkDayService.GetAsync(selectedDate);
        if (existing is not null)
        {
            selectedDayType = existing.DayType;
            startTimeStr = existing.StartTime?.ToString("HH:mm");
            actualExitTimeStr = existing.ActualExitTime?.ToString("HH:mm");
            extraHoursDelta = existing.ExtraHoursDelta;
            notes = existing.Notes;
        }
        else
        {
            selectedDayType = DayType.None;
            startTimeStr = null;
            actualExitTimeStr = null;
            extraHoursDelta = 0;
            notes = null;
        }
    }

    private async Task OnDateChanged(ChangeEventArgs e)
    {
        if (DateOnly.TryParse(e.Value?.ToString(), out var d))
        {
            selectedDate = d;
            festivities = FestivitySource.GetFestivities(selectedDate.Year);
            await LoadExistingEntry();
            RecomputeFlags();
            RecomputePreview();
            statusMessage = null;
        }
    }

    private void OnDayTypeChanged(ChangeEventArgs e)
    {
        if (Enum.TryParse<DayType>(e.Value?.ToString(), out var dt))
        {
            selectedDayType = dt;
            RecomputePreview();
            statusMessage = null;
        }
    }

    private void OnStartTimeChanged(ChangeEventArgs e)
    {
        startTimeStr = e.Value?.ToString();
        RecomputePreview();
        statusMessage = null;
    }

    private void OnActualExitChanged(ChangeEventArgs e)
    {
        actualExitTimeStr = e.Value?.ToString();
        statusMessage = null;
    }

    private void OnExtraDeltaChanged(ChangeEventArgs e)
    {
        if (decimal.TryParse(e.Value?.ToString(), out var val))
        {
            extraHoursDelta = val;
        }
        RecomputePreview();
        statusMessage = null;
    }

    private void RecomputeFlags()
    {
        isWeekend = selectedDate.DayOfWeek is DayOfWeek.Saturday or DayOfWeek.Sunday;
        isFestivity = festivities.Contains(selectedDate);
    }

    private void RecomputePreview()
    {
        TimeOnly? start = null;
        if (!string.IsNullOrEmpty(startTimeStr) && TimeOnly.TryParse(startTimeStr, out var s))
        {
            start = s;
        }

        if (selectedDayType is DayType.Work or DayType.Home)
        {
            workedHoursBase = settings.StandardWorkHoursPerDay;
            if (start.HasValue)
            {
                var totalHours = settings.StandardWorkHoursPerDay + settings.LunchBreakHours;
                projectedExitTime = start.Value.Add(TimeSpan.FromHours((double)totalHours));
            }
            else
            {
                projectedExitTime = null;
            }
        }
        else
        {
            workedHoursBase = 0;
            projectedExitTime = null;
        }

        workedHoursFinal = workedHoursBase + extraHoursDelta;

        hoursOff = selectedDayType is DayType.Work or DayType.Home
            ? Math.Max(0, settings.StandardWorkHoursPerDay - workedHoursFinal)
            : 0;

        grossIncome = workedHoursFinal * settings.HourlyGrossRate;
        var taxableBase = grossIncome * settings.ProfitabilityCoefficient;
        netIncome = grossIncome - (taxableBase * settings.InpsRate) - (taxableBase * settings.SubstituteTaxRate);
    }

    private async Task SaveAsync()
    {
        TimeOnly? start = null;
        TimeOnly? exit = null;

        if (!string.IsNullOrEmpty(startTimeStr) && TimeOnly.TryParse(startTimeStr, out var s))
        {
            start = s;
        }
        if (!string.IsNullOrEmpty(actualExitTimeStr) && TimeOnly.TryParse(actualExitTimeStr, out var e2))
        {
            exit = e2;
        }

        var workDay = new WorkDayDocument
        {
            Date = selectedDate,
            DayType = selectedDayType,
            StartTime = start,
            ActualExitTime = exit,
            ExtraHoursDelta = extraHoursDelta,
            Notes = notes
        };

        var saved = await WorkDayService.SaveAsync(workDay);

        // Update preview with saved computed values
        projectedExitTime = saved.ProjectedExitTime;
        workedHoursBase = saved.WorkedHoursBase;
        workedHoursFinal = saved.WorkedHoursFinal;
        hoursOff = saved.HoursOff;
        grossIncome = saved.GrossIncome;
        netIncome = saved.NetIncome;
        isWeekend = saved.IsWeekend;
        isFestivity = saved.IsItalianFestivity;

        statusMessage = $"Saved at {DateTime.Now:t}";
    }
}