using System;
using System.Collections.Generic;
using AcDream.App.UI;
using AcDream.App.UI.Layout;
using AcDream.Core.Combat;
using AcDream.Core.Items;
using AcDream.Core.Net.Messages;
using Xunit;

namespace AcDream.App.Tests.UI.Layout;

public class ToolbarControllerTests
{
    private static readonly uint[] Row1 =
        { 0x100001A7,0x100001A8,0x100001A9,0x100001AA,0x100001AB,0x100001AC,0x100001AD,0x100001AE,0x100001AF };
    private static readonly uint[] Row2 =
        { 0x100006B7,0x100006B8,0x100006B9,0x100006BA,0x100006BB,0x100006BC,0x100006BD,0x100006BE,0x100006BF };

    // The four mutually-exclusive combat-mode indicator element ids (must match ToolbarController's list).
    private static readonly uint[] CombatIds = { 0x10000192u, 0x10000193u, 0x10000194u, 0x10000195u };

    private static (ImportedLayout layout, Dictionary<uint, UiItemList> slots,
                    Dictionary<uint, UiElement> indicators) FakeToolbar()
    {
        var dict = new Dictionary<uint, UiElement>();
        var slots = new Dictionary<uint, UiItemList>();
        var indicators = new Dictionary<uint, UiElement>();
        var root = new UiPanel();
        foreach (var id in Row1) AddSlot(id);
        foreach (var id in Row2) AddSlot(id);
        // Add combat indicator elements as plain UiPanels keyed by id.
        foreach (var id in CombatIds)
        {
            var e = new UiPanel { Visible = true };
            dict[id] = e; indicators[id] = e; root.AddChild(e);
        }
        return (new ImportedLayout(root, dict), slots, indicators);

        void AddSlot(uint id)
        {
            var list = new UiItemList(_ => (0u, 0, 0)) { Width = 32, Height = 32 };
            dict[id] = list; slots[id] = list; root.AddChild(list);
        }
    }

    [Fact]
    public void Populate_bindsShortcutToCorrectSlot()
    {
        var (layout, slots, _) = FakeToolbar();
        var repo = new ItemRepository();
        repo.AddOrUpdate(new ItemInstance { ObjectId = 0x5001u, WeenieClassId = 1u, IconId = 0x06001234u });
        var shortcuts = new List<PlayerDescriptionParser.ShortcutEntry>
        { new(Index: 0, ObjectGuid: 0x5001u, SpellId: 0, Layer: 0) };

        ToolbarController.Bind(layout, repo, () => shortcuts,
            iconIds: (_,_,_,_) => 0x77u, useItem: _ => { });

        Assert.Equal(0x5001u, slots[Row1[0]].Cell.ItemId);
        Assert.Equal(0x77u,   slots[Row1[0]].Cell.IconTexture);
        Assert.Equal(0u,      slots[Row1[1]].Cell.ItemId); // others empty
    }

    [Fact]
    public void DeferredRebind_whenItemArrivesLate()
    {
        var (layout, slots, _) = FakeToolbar();
        var repo = new ItemRepository(); // item NOT present yet
        var shortcuts = new List<PlayerDescriptionParser.ShortcutEntry>
        { new(Index: 2, ObjectGuid: 0x5002u, SpellId: 0, Layer: 0) };

        ToolbarController.Bind(layout, repo, () => shortcuts,
            iconIds: (_,_,_,_) => 0x88u, useItem: _ => { });
        Assert.Equal(0u, slots[Row1[2]].Cell.ItemId); // not bound yet

        repo.AddOrUpdate(new ItemInstance { ObjectId = 0x5002u, WeenieClassId = 1u, IconId = 0x06005678u });

        Assert.Equal(0x5002u, slots[Row1[2]].Cell.ItemId); // rebound on ItemAdded
    }

    [Fact]
    public void Click_emitsUseForBoundItem()
    {
        var (layout, slots, _) = FakeToolbar();
        var repo = new ItemRepository();
        repo.AddOrUpdate(new ItemInstance { ObjectId = 0x5001u, WeenieClassId = 1u, IconId = 0x06001234u });
        var shortcuts = new List<PlayerDescriptionParser.ShortcutEntry>
        { new(Index: 0, ObjectGuid: 0x5001u, SpellId: 0, Layer: 0) };
        uint used = 0;

        ToolbarController.Bind(layout, repo, () => shortcuts,
            iconIds: (_,_,_,_) => 0x77u, useItem: g => used = g);
        // UiEvent is a positional record struct: (SourceId, Target, Type, Data0..3, Payload)
        slots[Row1[0]].Cell.OnEvent(new UiEvent(0u, null, UiEventType.MouseDown));

        Assert.Equal(0x5001u, used);
    }

    // ── C1: combat-mode indicator tests ─────────────────────────────────────

    /// <summary>
    /// At bind time (default NonCombat), only the peace indicator (0x10000192) is visible;
    /// the melee/missile/magic indicators (0x10000193/4/5) are hidden.
    /// Port of gmToolbarUI::RecvNotice_SetCombatMode (acclient_2013_pseudo_c.txt:196632-196669).
    /// </summary>
    [Fact]
    public void CombatIndicator_defaultNonCombat_onlyPeaceVisible()
    {
        var (layout, _, indicators) = FakeToolbar();
        var repo = new ItemRepository();

        ToolbarController.Bind(layout, repo,
            () => Array.Empty<PlayerDescriptionParser.ShortcutEntry>(),
            iconIds: (_,_,_,_) =>0u, useItem: _ => { });

        // Only peace indicator (index 0 = 0x10000192) is visible.
        Assert.True (indicators[0x10000192u].Visible, "peace indicator should be visible after bind");
        Assert.False(indicators[0x10000193u].Visible, "melee indicator should be hidden after bind");
        Assert.False(indicators[0x10000194u].Visible, "missile indicator should be hidden after bind");
        Assert.False(indicators[0x10000195u].Visible, "magic indicator should be hidden after bind");
    }

    /// <summary>
    /// SetCombatMode(Melee) hides peace/missile/magic and shows only the melee indicator.
    /// </summary>
    [Fact]
    public void CombatIndicator_setCombatModeMelee_onlyMeleeVisible()
    {
        var (layout, _, indicators) = FakeToolbar();
        var repo = new ItemRepository();

        var ctrl = ToolbarController.Bind(layout, repo,
            () => Array.Empty<PlayerDescriptionParser.ShortcutEntry>(),
            iconIds: (_,_,_,_) =>0u, useItem: _ => { });

        ctrl.SetCombatMode(CombatMode.Melee);

        Assert.False(indicators[0x10000192u].Visible, "peace indicator should be hidden in melee mode");
        Assert.True (indicators[0x10000193u].Visible, "melee indicator should be visible in melee mode");
        Assert.False(indicators[0x10000194u].Visible, "missile indicator should be hidden in melee mode");
        Assert.False(indicators[0x10000195u].Visible, "magic indicator should be hidden in melee mode");
    }

    /// <summary>
    /// CombatModeChanged event on CombatState automatically updates the indicator.
    /// </summary>
    [Fact]
    public void CombatIndicator_liveSignal_updatesWhenCombatStateChanges()
    {
        var (layout, _, indicators) = FakeToolbar();
        var repo = new ItemRepository();
        var combat = new CombatState();

        ToolbarController.Bind(layout, repo,
            () => Array.Empty<PlayerDescriptionParser.ShortcutEntry>(),
            iconIds: (_,_,_,_) =>0u, useItem: _ => { },
            combatState: combat);

        // Initially NonCombat after bind.
        Assert.True(indicators[0x10000192u].Visible, "peace should be visible initially");

        // Server fires CombatModeChanged → Magic.
        combat.SetCombatMode(CombatMode.Magic);

        Assert.False(indicators[0x10000192u].Visible, "peace should be hidden in magic mode");
        Assert.False(indicators[0x10000193u].Visible, "melee should be hidden in magic mode");
        Assert.False(indicators[0x10000194u].Visible, "missile should be hidden in magic mode");
        Assert.True (indicators[0x10000195u].Visible, "magic indicator should be visible");
    }
}