using AcDream.App.Spells;
using AcDream.Core.Spells;

namespace AcDream.App.Tests.Spells;

public sealed class SpellCastingControllerTests
{
    [Fact]
    public void Cast_SelfTargeted_SendsLocalPlayerAsTarget()
    {
        Spellbook book = MakeBook(flags: 0x8, untargeted: true, targetMask: 0x10);
        uint target = 0;
        var controller = MakeController(book, selected: 99, player: 42,
            sendTargeted: (id, _) => target = id);

        Assert.Equal(CastRequestResult.Sent, controller.Cast(1));
        Assert.Equal(42u, target);
    }

    [Fact]
    public void Cast_TargetedWithoutSelection_DoesNotSend()
    {
        Spellbook book = MakeBook(flags: 0, untargeted: false, targetMask: 0x10);
        int sends = 0;
        string message = "";
        var controller = MakeController(book, selected: null, player: 42,
            sendTargeted: (_, _) => sends++, display: value => message = value);

        Assert.Equal(CastRequestResult.NoTarget, controller.Cast(1));
        Assert.Equal(0, sends);
        Assert.Contains("select", message, StringComparison.OrdinalIgnoreCase);
    }

    [Fact]
    public void Cast_Untargeted_StopsThenSendsThenIncrementsBusy()
    {
        Spellbook book = MakeBook(flags: 0, untargeted: true, targetMask: 0);
        var order = new List<string>();
        var controller = MakeController(book, selected: null, player: 42,
            stop: () => order.Add("stop"),
            sendUntargeted: _ => order.Add("send"),
            incrementBusy: () => order.Add("busy"));

        Assert.Equal(CastRequestResult.Sent, controller.Cast(1));
        Assert.Equal(["stop", "send", "busy"], order);
    }

    [Fact]
    public void Cast_MissingComponents_DoesNotIncrementBusyOrSend()
    {
        Spellbook book = MakeBook(flags: 0, untargeted: true, targetMask: 0);
        int sends = 0, busy = 0;
        var controller = MakeController(book, selected: null, player: 42,
            sendUntargeted: _ => sends++, hasComponents: _ => false,
            incrementBusy: () => busy++);

        Assert.Equal(CastRequestResult.MissingComponents, controller.Cast(1));
        Assert.Equal(0, sends);
        Assert.Equal(0, busy);
    }

    [Fact]
    public void Cast_Disconnected_DoesNotIncrementBusy()
    {
        Spellbook book = MakeBook(flags: 0, untargeted: true, targetMask: 0);
        int busy = 0;
        var controller = MakeController(book, selected: null, player: 42,
            incrementBusy: () => busy++, canSend: () => false);

        Assert.Equal(CastRequestResult.Unavailable, controller.Cast(1));
        Assert.Equal(0, busy);
    }

    [Fact]
    public void Cast_SendThrows_DoesNotIncrementBusyAndRethrows()
    {
        Spellbook book = MakeBook(flags: 0, untargeted: true, targetMask: 0);
        int increments = 0;
        var controller = MakeController(book, selected: null, player: 42,
            sendUntargeted: _ => throw new InvalidOperationException("wire"),
            incrementBusy: () => increments++);

        Assert.Throws<InvalidOperationException>(() => controller.Cast(1));
        Assert.Equal(0, increments);
        Assert.Null(controller.LastRequestedSpellId);
    }

    private static SpellCastingController MakeController(
        Spellbook book,
        uint? selected,
        uint player,
        Action? stop = null,
        Action<uint>? sendUntargeted = null,
        Action<uint, uint>? sendTargeted = null,
        Action<string>? display = null,
        Func<uint, bool>? hasComponents = null,
        Action? incrementBusy = null,
        Func<bool>? canSend = null) => new(
            book,
            () => selected,
            () => player,
            stop ?? (() => { }),
            sendUntargeted ?? (_ => { }),
            sendTargeted ?? ((_, _) => { }),
            display ?? (_ => { }),
            hasRequiredComponents: hasComponents,
            incrementBusy: incrementBusy,
            canSend: canSend);

    private static Spellbook MakeBook(uint flags, bool untargeted, uint targetMask)
    {
        const string header = "Spell ID,Name,Flags [Hex],IsUntargetted,TargetMask [Hex]";
        string row = $"1,Test,0x{flags:X},{untargeted},0x{targetMask:X}";
        SpellTable table = SpellTable.LoadFromReader(new StringReader($"{header}\n{row}"));
        var book = new Spellbook(table);
        book.OnSpellLearned(1);
        return book;
    }
}