// <copyright file="ResetCharacterActionTest.cs" company="MUnique">
// Licensed under the MIT License. See LICENSE file in the project root for full license information.
// </copyright>

namespace MUnique.OpenMU.Tests;

using Moq;
using MUnique.OpenMU.DataModel.Configuration;
using MUnique.OpenMU.DataModel.Configuration.Items;
using MUnique.OpenMU.DataModel.Entities;
using MUnique.OpenMU.GameLogic;
using MUnique.OpenMU.GameLogic.Attributes;
using MUnique.OpenMU.GameLogic.NPC;
using MUnique.OpenMU.GameLogic.Resets;
using MUnique.OpenMU.GameLogic.Views.World;
using MUnique.OpenMU.Pathfinding;

/// <summary>
/// Tests for <see cref="ResetCharacterAction"/>.
/// </summary>
[TestFixture]
public class ResetCharacterActionTest
{
    /// <summary>
    /// Verifies that reset is rejected when required items are missing, without charging zen.
    /// </summary>
    [Test]
    public async Task NotEnoughItemsRejectsResetAndKeepsZenAsync()
    {
        var player = await PlayerTestHelper.CreatePlayerAsync().ConfigureAwait(false);
        player.Attributes![Stats.Level] = 400;
        player.Money = 1_000;

        var requiredItem = new ItemDefinition { Name = "Jewel of Creation", Group = 14, Number = 22, Width = 1, Height = 1 };
        var configuration = this.CreateConfiguration(requiredItem);
        player.GameContext.FeaturePlugIns.AddPlugIn(new ResetFeaturePlugIn { Configuration = configuration }, true);

        await AddRequiredItemsAsync(player, requiredItem, 1).ConfigureAwait(false);
        var action = new ResetCharacterAction(player, await CreateResetNpcAsync(player).ConfigureAwait(false));

        await action.ResetCharacterAsync().ConfigureAwait(false);

        Assert.That((int)player.Attributes[Stats.Resets], Is.EqualTo(0));
        Assert.That(player.Money, Is.EqualTo(1_000));
        Assert.That(player.Inventory!.Items.Count(i => i.Definition == requiredItem), Is.EqualTo(1));
    }

    /// <summary>
    /// Verifies that reset consumes configured zen and required items when all conditions are met.
    /// </summary>
    [Test]
    public async Task EnoughItemsAndZenConsumesCostsOnceAsync()
    {
        var player = await PlayerTestHelper.CreatePlayerAsync().ConfigureAwait(false);
        player.Attributes![Stats.Level] = 400;
        player.Money = 1_000;

        var requiredItem = new ItemDefinition { Name = "Jewel of Creation", Group = 14, Number = 22, Width = 1, Height = 1 };
        var configuration = this.CreateConfiguration(requiredItem);
        player.GameContext.FeaturePlugIns.AddPlugIn(new ResetFeaturePlugIn { Configuration = configuration }, true);

        await AddRequiredItemsAsync(player, requiredItem, 2).ConfigureAwait(false);
        Assert.That(player.Level, Is.EqualTo(400));
        Assert.That(player.Money, Is.EqualTo(1_000));
        Assert.That(
            player.Inventory!.Items.Count(i => i.Definition is { } definition && definition.Group == requiredItem.Group && definition.Number == requiredItem.Number),
            Is.EqualTo(2));
        var progression = ResetProgressionCalculator.Calculate((int)player.Attributes[Stats.Resets], (int)player.Attributes[Stats.PointsPerReset], configuration);
        Assert.That(progression.RequiredItemAmount, Is.EqualTo(2));
        Assert.That(progression.RequiredZen, Is.EqualTo(500));
        var action = new ResetCharacterAction(player, await CreateResetNpcAsync(player).ConfigureAwait(false));

        await action.ResetCharacterAsync().ConfigureAwait(false);

        Assert.That((int)player.Attributes[Stats.Resets], Is.EqualTo(1));
        Assert.That(player.Money, Is.EqualTo(500));
        Assert.That(player.Inventory!.Items.Count(i => i.Definition == requiredItem), Is.EqualTo(0));
        Assert.That(player.SelectedCharacter!.LevelUpPoints, Is.EqualTo(800));
        Assert.That((int)player.Attributes[Stats.Level], Is.EqualTo(1));
    }

    /// <summary>
    /// Verifies cumulative point replacement across multiple resets when point tiers are configured.
    /// </summary>
    [Test]
    public async Task ReplacePointsUsesCumulativeTierTotalAcrossResetsAsync()
    {
        var player = await PlayerTestHelper.CreatePlayerAsync().ConfigureAwait(false);
        player.Attributes![Stats.Level] = 400;
        player.Money = 2_000;

        var requiredItem = new ItemDefinition { Name = "Jewel of Creation", Group = 14, Number = 22, Width = 1, Height = 1 };
        var configuration = this.CreateConfiguration(requiredItem);
        player.GameContext.FeaturePlugIns.AddPlugIn(new ResetFeaturePlugIn { Configuration = configuration }, true);

        await AddRequiredItemsAsync(player, requiredItem, 4).ConfigureAwait(false);
        var action = new ResetCharacterAction(player, await CreateResetNpcAsync(player).ConfigureAwait(false));

        await action.ResetCharacterAsync().ConfigureAwait(false);
        Assert.That((int)player.Attributes[Stats.Resets], Is.EqualTo(1));
        Assert.That(player.SelectedCharacter!.LevelUpPoints, Is.EqualTo(800));
        Assert.That(player.Money, Is.EqualTo(1_500));

        player.Attributes[Stats.Level] = 400;
        await action.ResetCharacterAsync().ConfigureAwait(false);

        Assert.That((int)player.Attributes[Stats.Resets], Is.EqualTo(2));
        Assert.That(player.SelectedCharacter!.LevelUpPoints, Is.EqualTo(1_600));
        Assert.That(player.Money, Is.EqualTo(500));
    }

    /// <summary>
    /// Verifies add mode behavior when replace mode is disabled.
    /// </summary>
    [Test]
    public async Task TieredPointsAreAddedWhenReplaceIsDisabledAsync()
    {
        var player = await PlayerTestHelper.CreatePlayerAsync().ConfigureAwait(false);
        player.Attributes![Stats.Level] = 400;
        player.Money = 1_000;
        player.SelectedCharacter!.LevelUpPoints = 1_000;

        var requiredItem = new ItemDefinition { Name = "Jewel of Creation", Group = 14, Number = 22, Width = 1, Height = 1 };
        var configuration = this.CreateConfiguration(requiredItem);
        configuration.ReplacePointsPerReset = false;
        player.GameContext.FeaturePlugIns.AddPlugIn(new ResetFeaturePlugIn { Configuration = configuration }, true);

        await AddRequiredItemsAsync(player, requiredItem, 2).ConfigureAwait(false);
        var action = new ResetCharacterAction(player, await CreateResetNpcAsync(player).ConfigureAwait(false));

        await action.ResetCharacterAsync().ConfigureAwait(false);

        Assert.That((int)player.Attributes[Stats.Resets], Is.EqualTo(1));
        Assert.That(player.SelectedCharacter!.LevelUpPoints, Is.EqualTo(1_800));
    }

    /// <summary>
    /// Verifies that a reset with <see cref="ResetConfiguration.MoveHome"/> moves the player through
    /// the regular warp path, so the client is told about the new position.
    /// Writing the character's position fields directly moves the player without notifying anyone,
    /// which makes the character slide across the map on the client instead of respawning.
    /// </summary>
    [Test]
    public async Task MoveHomeWarpsPlayerSoTheClientIsNotifiedAsync()
    {
        var player = await PlayerTestHelper.CreatePlayerAsync().ConfigureAwait(false);
        player.Attributes![Stats.Level] = 400;
        player.Money = 1_000;

        // The home map has to be one whose GameMap instance does not exist yet: the spawn gate is
        // resolved once, in the GameMap constructor, so a map created earlier would ignore it.
        var homeMap = CreateMapDefinitionWithSpawnGate(1, 125);
        player.GameContext.Configuration.Maps.Add(homeMap);
        Mock.Get(player.SelectedCharacter!.CharacterClass!).Setup(c => c.HomeMap).Returns(homeMap);

        var configuration = this.CreateConfiguration(null);
        configuration.MoveHome = true;
        player.GameContext.FeaturePlugIns.AddPlugIn(new ResetFeaturePlugIn { Configuration = configuration }, true);

        var mapChangeView = Mock.Get(player.ViewPlugIns.GetPlugIn<IMapChangePlugIn>()!);
        var action = new ResetCharacterAction(player);

        await action.ResetCharacterAsync().ConfigureAwait(false);

        Assert.That((int)player.Attributes[Stats.Resets], Is.EqualTo(1));
        Assert.That(player.Position, Is.EqualTo(new Point(125, 125)));
        mapChangeView.Verify(v => v.MapChangeAsync(), Times.Once);
    }

    private static GameMapDefinition CreateMapDefinitionWithSpawnGate(short number, byte spawnCoordinate)
    {
        var mapMock = new Mock<GameMapDefinition>();
        mapMock.SetupAllProperties();
        mapMock.Setup(m => m.DropItemGroups).Returns(new List<DropItemGroup>());
        mapMock.Setup(m => m.MonsterSpawns).Returns(new List<MonsterSpawnArea>());
        mapMock.Object.TerrainData = new byte[ushort.MaxValue + 3];
        mapMock.Object.Number = number;
        var spawnGate = new ExitGate
        {
            IsSpawnGate = true,
            X1 = spawnCoordinate,
            X2 = spawnCoordinate,
            Y1 = spawnCoordinate,
            Y2 = spawnCoordinate,
            Map = mapMock.Object,
        };
        mapMock.Setup(m => m.ExitGates).Returns(new List<ExitGate> { spawnGate });
        return mapMock.Object;
    }

    private static async ValueTask AddRequiredItemsAsync(Player player, ItemDefinition requiredItem, int count)
    {
        for (byte i = 0; i < count; i++)
        {
            var item = player.PersistenceContext.CreateNew<Item>();
            item.Definition = requiredItem;
            item.Durability = 1;
            var added = await player.Inventory!.AddItemAsync(item).ConfigureAwait(false);
            Assert.That(added, Is.True);
        }
    }

    private static async ValueTask<NonPlayerCharacter> CreateResetNpcAsync(Player player)
    {
        var spawnArea = new MonsterSpawnArea
        {
            X1 = 125,
            X2 = 125,
            Y1 = 125,
            Y2 = 125,
        };

        var definition = new MonsterDefinition
        {
            Number = ResetCharacterNpcPlugin.ResetNpcNumber,
            ObjectKind = NpcObjectKind.PassiveNpc,
            Designation = "Reset Helper",
        };

        var map = await player.GameContext.GetMapAsync(0).ConfigureAwait(false)
                  ?? throw new InvalidOperationException("Could not resolve map 0 for NPC test setup.");
        return new NonPlayerCharacter(spawnArea, definition, map);
    }

    private ResetConfiguration CreateConfiguration(ItemDefinition? requiredItem)
    {
        return new ResetConfiguration
        {
            RequiredLevel = 400,
            LevelAfterReset = 1,
            RequiredMoney = 500,
            MultiplyRequiredMoneyByResetCount = true,
            RequiredResetItem = requiredItem,
            ItemCostTiers =
            [
                new() { MinimumResetCount = 1, RequiredItemAmount = 2 },
            ],
            PointsTiers =
            [
                new() { MinimumResetCount = 1, PointsGranted = 800 },
            ],
            MoveHome = false,
            LogOut = false,
            ResetStats = false,
            ReplacePointsPerReset = true,
        };
    }
}