@using System.Linq

@inject IStringLocalizer<App> localizer

<div class="card p-4">
    @if (SelectionMode is null)
    {
        <h5>Wie soll die Reihenfolge vergeben werden?</h5>
        <button class="btn btn-primary me-2" @onclick="UseManual">🔢 Manuell</button>
        <button class="btn btn-secondary" @onclick="UseRandom">🎲 Randomized</button>
    }
    else if (SelectionMode == "manual")
    {
        <h5>Manuelle Spielerreihenfolge</h5>

        <table class="table table-sm">
            <thead>
                <tr>
                    <th>Spieler</th>
                    <th>Reihenfolge</th>
                    <th>Startposition</th>
                </tr>
            </thead>
            <tbody>
                @foreach (var player in Players)
                {
                    <tr>
                        <td>@player.User.Username</td>
                        <td>
                            <div class="d-inline-block">
                                <InputSelect class="form-select" @bind-Value="player.OrderNr">
                                    <option value="0">@localizer["SELECT_CHOOSE"]</option>
                                    @foreach (var number in Enumerable.Range(1, Players.Count))
                                    {
                                        bool isUsed = Players.Any(p => p.PlayerId != player.PlayerId && p.OrderNr == number);
                                        <option value="@number" disabled="@(isUsed && player.OrderNr != number)">
                                            @number
                                        </option>
                                    }
                                </InputSelect>
                            </div>
                        </td>
                        <td>
                            <div class="d-inline-block">
                                <InputSelect class="form-select" @bind-Value="player.StartZone">
                                    <option value="0">@localizer["SELECT_CHOOSE"]</option>
                                    @foreach (var number in Enumerable.Range(1, Players.Count))
                                    {
                                        bool isUsed = Players.Any(p => p.PlayerId != player.PlayerId && p.StartZone == number);
                                        <option value="@number" disabled="@(isUsed && player.StartZone != number)">
                                            @number
                                        </option>
                                    }
                                </InputSelect>
                            </div>
                        </td>
                    </tr>
                }
            </tbody>
        </table>

        @if (!string.IsNullOrEmpty(ValidationMessage))
        {
            <div class="alert alert-danger">@ValidationMessage</div>
        }

        <button class="btn btn-success" @onclick="FinishManual">✅ Bestätigen</button>
    }
    else if (SelectionMode == "random")
    {
        <div class="alert alert-info">🎲 Die Reihenfolge wurde zufällig vergeben.</div>
    }
</div>

@code {
    [Parameter]
    public List<Player> Players { get; set; } = new();

    [Parameter]
    public EventCallback<List<Player>> OnOrderChanged { get; set; }

    private string? SelectionMode = null;
    private string? ValidationMessage;

    private void UseManual()
    {
        SelectionMode = "manual";
        foreach (var p in Players)
        {
            p.OrderNr = 0; // zurücksetzen
        }
    }

    private async void UseRandom()
    {
        var rnd = new Random();

        // Zufällige Reihenfolge vergeben
        Players = Players.OrderBy(_ => rnd.Next()).ToList();
        for (int i = 0; i < Players.Count; i++)
        {
            Players[i].OrderNr = i + 1;
        }

        // Startzonen zufällig verteilen
        var availableZones = Enumerable.Range(1, Players.Count).OrderBy(_ => rnd.Next()).ToList();
        for (int i = 0; i < Players.Count; i++)
        {
            Players[i].StartZone = availableZones[i];
        }

        SelectionMode = "random";
        await OnOrderChanged.InvokeAsync(Players);
    }

    private void SetOrder(Player player, string? value)
    {
        if (int.TryParse(value, out var number))
        {
            player.OrderNr = number;
        }
        else
        {
            player.OrderNr = 0;
        }
    }

    private bool IsNumberUsed(int number)
    {
        return Players.Any(p => p.OrderNr == number);
    }

    private async void FinishManual()
    {
        ValidationMessage = null;

        var usedOrders = Players.Select(p => p.OrderNr).Where(o => o > 0).ToList();

        if (usedOrders.Count != Players.Count)
        {
            ValidationMessage = "⚠️ Es wurden noch nicht allen Spielern Nummern zugewiesen.";
            return;
        }

        if (usedOrders.Distinct().Count() != Players.Count)
        {
            ValidationMessage = "⚠️ Jede Nummer darf nur einmal vergeben werden.";
            return;
        }

        Players = Players.OrderBy(p => p.OrderNr).ToList();
        await OnOrderChanged.InvokeAsync(Players);
    }
}