@page "/"
@using Microsoft.EntityFrameworkCore
@using TrafagSalesExporter.Data
@using TrafagSalesExporter.Services
@inject IDbContextFactory<AppDbContext> DbFactory
@inject ExportOrchestrationService Orchestrator
@inject TimerBackgroundService TimerService
@inject ISnackbar Snackbar
@implements IDisposable

<PageTitle>Dashboard</PageTitle>

<MudText Typo="Typo.h4" Class="mb-4">Dashboard</MudText>

<MudPaper Class="pa-4 mb-4" Elevation="1">
    <MudStack Row AlignItems="AlignItems.Center" Spacing="4">
        <MudButton Variant="Variant.Filled" Color="Color.Primary" StartIcon="@Icons.Material.Filled.PlayArrow"
                   OnClick="ExportAll" Disabled="_anyRunning">
            Alle exportieren
        </MudButton>
        <MudText Typo="Typo.body1">
            @if (TimerService.NextRun < DateTime.MaxValue)
            {
                <MudIcon Icon="@Icons.Material.Filled.Schedule" Size="Size.Small" Class="mr-1" />
                @($"Nächster automatischer Lauf: {TimerService.NextRun:dd.MM.yyyy HH:mm}")
            }
            else
            {
                <MudIcon Icon="@Icons.Material.Filled.TimerOff" Size="Size.Small" Class="mr-1" />
                @("Timer deaktiviert")
            }
        </MudText>
    </MudStack>
</MudPaper>

<MudTable Items="_dashboardRows" Dense Hover Striped Loading="_loading">
    <HeaderContent>
        <MudTh>Land</MudTh>
        <MudTh>TSC</MudTh>
        <MudTh>Schema</MudTh>
        <MudTh>Server</MudTh>
        <MudTh>Status</MudTh>
        <MudTh>Zeilen</MudTh>
        <MudTh>Letzter Lauf</MudTh>
        <MudTh>Dauer</MudTh>
        <MudTh>Aktion</MudTh>
    </HeaderContent>
    <RowTemplate>
        <MudTd>@context.Land</MudTd>
        <MudTd>@context.TSC</MudTd>
        <MudTd>@context.Schema</MudTd>
        <MudTd>@context.ServerName</MudTd>
        <MudTd>
            @if (Orchestrator.IsExporting(context.SiteId))
            {
                <MudProgressCircular Size="Size.Small" Indeterminate Color="Color.Primary" Class="mr-1" />
                <MudText Typo="Typo.caption">@Orchestrator.GetExportStatus(context.SiteId)</MudText>
            }
            else if (context.LastStatus == "OK")
            {
                <MudIcon Icon="@Icons.Material.Filled.CheckCircle" Color="Color.Success" Size="Size.Small" />
            }
            else if (context.LastStatus == "Error")
            {
                <MudTooltip Text="@context.ErrorMessage">
                    <MudIcon Icon="@Icons.Material.Filled.Error" Color="Color.Error" Size="Size.Small" />
                </MudTooltip>
            }
            else
            {
                <MudText Typo="Typo.caption" Color="Color.Default">-</MudText>
            }
        </MudTd>
        <MudTd>@(context.RowCount > 0 ? context.RowCount.ToString("N0") : "-")</MudTd>
        <MudTd>@(context.LastRun.HasValue ? context.LastRun.Value.ToString("dd.MM.yyyy HH:mm:ss") : "-")</MudTd>
        <MudTd>@(context.DurationSeconds > 0 ? $"{context.DurationSeconds:F1}s" : "-")</MudTd>
        <MudTd>
            <MudButton Size="Size.Small" Variant="Variant.Outlined" Color="Color.Primary"
                       StartIcon="@Icons.Material.Filled.FileDownload"
                       OnClick="() => ExportSingle(context.SiteId)"
                       Disabled="Orchestrator.IsExporting(context.SiteId)">
                Export
            </MudButton>
        </MudTd>
    </RowTemplate>
</MudTable>

@code {
    private List<DashboardRow> _dashboardRows = new();
    private bool _loading = true;
    private bool _anyRunning;

    protected override async Task OnInitializedAsync()
    {
        Orchestrator.OnExportStatusChanged += HandleStatusChanged;
        await LoadDataAsync();
    }

    private async Task LoadDataAsync()
    {
        _loading = true;
        using var db = await DbFactory.CreateDbContextAsync();

        var sites = await db.Sites.Include(s => s.HanaServer).Where(s => s.IsActive).ToListAsync();
        var logs = await db.ExportLogs
            .GroupBy(l => l.SiteId)
            .Select(g => g.OrderByDescending(l => l.Timestamp).First())
            .ToListAsync();

        _dashboardRows = sites.Select(s =>
        {
            var log = logs.FirstOrDefault(l => l.SiteId == s.Id);
            return new DashboardRow
            {
                SiteId = s.Id,
                Land = s.Land,
                TSC = s.TSC,
                Schema = s.Schema,
                ServerName = s.HanaServer?.Name ?? "",
                LastStatus = log?.Status ?? "",
                RowCount = log?.RowCount ?? 0,
                LastRun = log?.Timestamp,
                DurationSeconds = log?.DurationSeconds ?? 0,
                ErrorMessage = log?.ErrorMessage ?? ""
            };
        }).ToList();

        _anyRunning = _dashboardRows.Any(r => Orchestrator.IsExporting(r.SiteId));
        _loading = false;
    }

    private async Task ExportAll()
    {
        _anyRunning = true;
        _ = Task.Run(async () =>
        {
            await Orchestrator.ExportAllAsync();
            await InvokeAsync(async () =>
            {
                await LoadDataAsync();
                StateHasChanged();
            });
        });
        Snackbar.Add("Export für alle Standorte gestartet", Severity.Info);
    }

    private void ExportSingle(int siteId)
    {
        _ = Task.Run(async () =>
        {
            await Orchestrator.ExportSiteByIdAsync(siteId);
            await InvokeAsync(async () =>
            {
                await LoadDataAsync();
                StateHasChanged();
            });
        });
        Snackbar.Add("Export gestartet", Severity.Info);
    }

    private async void HandleStatusChanged()
    {
        await InvokeAsync(async () =>
        {
            _anyRunning = _dashboardRows.Any(r => Orchestrator.IsExporting(r.SiteId));
            StateHasChanged();
            if (!_anyRunning)
            {
                await LoadDataAsync();
                StateHasChanged();
            }
        });
    }

    public void Dispose()
    {
        Orchestrator.OnExportStatusChanged -= HandleStatusChanged;
    }

    private class DashboardRow
    {
        public int SiteId { get; set; }
        public string Land { get; set; } = "";
        public string TSC { get; set; } = "";
        public string Schema { get; set; } = "";
        public string ServerName { get; set; } = "";
        public string LastStatus { get; set; } = "";
        public int RowCount { get; set; }
        public DateTime? LastRun { get; set; }
        public double DurationSeconds { get; set; }
        public string ErrorMessage { get; set; } = "";
    }
}