@page "/grid"
@page "/grid/{YearMonth}"
@attribute [Authorize]
@rendermode InteractiveServer

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

<PageTitle>Grid View</PageTitle>

<h1>Grid View</h1>

<div class="d-flex align-items-center gap-2 mb-3">
    <button class="btn btn-outline-secondary btn-sm" @onclick="PreviousMonth">&laquo; Prev</button>
    <h2 class="h5 mb-0">@currentDate.ToString("MMMM yyyy")</h2>
    <button class="btn btn-outline-secondary btn-sm" @onclick="NextMonth">Next &raquo;</button>
</div>

@if (loading)
{
    <p><em>Loading...</em></p>
}
else
{
    <div class="table-responsive">
        <table class="table table-sm table-bordered align-middle">
            <thead class="table-dark">
                <tr>
                    <th>Date</th>
                    <th>Day</th>
                    <th>Type</th>
                    <th>Start</th>
                    <th>Projected</th>
                    <th>Actual</th>
                    <th class="text-end">Worked</th>
                    <th class="text-end">Extra</th>
                    <th class="text-end">Off</th>
                    <th class="text-end">Gross €</th>
                    <th class="text-end">Net €</th>
                    <th></th>
                </tr>
            </thead>
            <tbody>
                @foreach (var row in calendarDays)
                {
                    <tr class="@GetRowClass(row)">
                        <td>@row.Date.ToString("dd")</td>
                        <td>@row.Date.ToString("ddd")</td>
                        @if (row.Entry is not null)
                        {
                            <td>@row.Entry.DayType</td>
                            <td>@(row.Entry.StartTime?.ToString("HH:mm") ?? "")</td>
                            <td>@(row.Entry.ProjectedExitTime?.ToString("HH:mm") ?? "")</td>
                            <td>@(row.Entry.ActualExitTime?.ToString("HH:mm") ?? "")</td>
                            <td class="text-end">@row.Entry.WorkedHoursFinal.ToString("N2")</td>
                            <td class="text-end">@FormatDelta(row.Entry.ExtraHoursDelta)</td>
                            <td class="text-end">@row.Entry.HoursOff.ToString("N2")</td>
                            <td class="text-end">@row.Entry.GrossIncome.ToString("N2")</td>
                            <td class="text-end">@row.Entry.NetIncome.ToString("N2")</td>
                        }
                        else
                        {
                            <td colspan="9" class="text-muted">—</td>
                        }
                        <td>
                            <a href="workday/@row.Date.ToString("yyyy-MM-dd")" class="btn btn-sm btn-outline-primary">Edit</a>
                        </td>
                    </tr>
                }
            </tbody>
        </table>
    </div>
}

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

    private DateOnly currentDate;
    private bool loading = true;
    private List<CalendarDayRow> calendarDays = [];
    private IReadOnlyCollection<DateOnly> festivities = [];

    protected override async Task OnInitializedAsync()
    {
        if (!string.IsNullOrEmpty(YearMonth) && DateTime.TryParseExact(YearMonth, "yyyy-MM", null, System.Globalization.DateTimeStyles.None, out var parsed))
        {
            currentDate = new DateOnly(parsed.Year, parsed.Month, 1);
        }
        else
        {
            currentDate = new DateOnly(DateTime.Today.Year, DateTime.Today.Month, 1);
        }

        await LoadMonth();
    }

    private async Task LoadMonth()
    {
        loading = true;
        festivities = FestivitySource.GetFestivities(currentDate.Year);

        var from = currentDate;
        var to = currentDate.AddMonths(1).AddDays(-1);
        var entries = await WorkDayService.GetRangeAsync(from, to);
        var lookup = entries.ToDictionary(e => e.Date);

        calendarDays = [];
        for (var d = from; d <= to; d = d.AddDays(1))
        {
            calendarDays.Add(new CalendarDayRow
            {
                Date = d,
                IsWeekend = d.DayOfWeek is DayOfWeek.Saturday or DayOfWeek.Sunday,
                IsFestivity = festivities.Contains(d),
                Entry = lookup.GetValueOrDefault(d)
            });
        }

        loading = false;
    }

    private async Task PreviousMonth()
    {
        currentDate = currentDate.AddMonths(-1);
        await LoadMonth();
    }

    private async Task NextMonth()
    {
        currentDate = currentDate.AddMonths(1);
        await LoadMonth();
    }

    private string GetRowClass(CalendarDayRow row)
    {
        if (row.IsWeekend || row.IsFestivity) return "table-danger";
        if (row.Entry is null) return "";
        return row.Entry.DayType switch
        {
            DayType.Closure => "table-warning",
            DayType.Illness => "table-info",
            DayType.DayOff => "table-secondary",
            DayType.Holiday => "table-success",
            DayType.Home => "table-light",
            _ => ""
        };
    }

    private static string FormatDelta(decimal d) => d switch
    {
        > 0 => $"+{d:N2}",
        < 0 => d.ToString("N2"),
        _ => "—"
    };

    private sealed class CalendarDayRow
    {
        public DateOnly Date { get; set; }
        public bool IsWeekend { get; set; }
        public bool IsFestivity { get; set; }
        public WorkDayDocument? Entry { get; set; }
    }
}