using PkmnLib.Dynamic.Events;
using PkmnLib.Dynamic.Models;
using PkmnLib.Plugin.Gen7.Scripts.Moves;
using PkmnLib.Static;
using PkmnLib.Static.Utils;

namespace PkmnLib.Plugin.Gen7.Tests.Scripts.Moves;

/// <summary>
/// Tests for the <see cref="Incinerate"/> move script.
/// Gen VII Bulbapedia behavior: "Incinerate inflicts damage to all adjacent opponents. The move destroys any
/// Berries held by hit Pokémon". Generation VI onwards: "The move now also destroys Gems."
/// </summary>
public class IncinerateTests
{
    /// <summary>
    /// Creates a fully mocked test setup for Incinerate tests, with the target holding the given item
    /// (nothing when null).
    /// </summary>
    private static (Incinerate script, IExecutingMove move, IBattlePokemon target, IHitData hitData, EventHook eventHook
        ) CreateTestSetup(IItem? heldItem)
    {
        var script = new Incinerate();
        var move = Substitute.For<IExecutingMove>();
        var target = Substitute.For<IBattlePokemon>();
        var hitData = Substitute.For<IHitData>();
        move.GetHitData(target, 0).Returns(hitData);

        var eventHook = new EventHook();
        var battle = Substitute.For<IBattle>();
        battle.EventHook.Returns(eventHook);
        move.Battle.Returns(battle);

        target.HeldItem.Returns(heldItem);
        if (heldItem != null)
        {
            target.TryStealHeldItem(out Arg.Any<IItem?>()).Returns(x =>
            {
                x[0] = heldItem;
                return true;
            });
        }

        return (script, move, target, hitData, eventHook);
    }

    /// <summary>
    /// Creates a substitute held item with the given name and category.
    /// </summary>
    private static IItem CreateItem(string name, ItemCategory category)
    {
        var item = Substitute.For<IItem>();
        item.Name.Returns(new StringKey(name));
        item.Category.Returns(category);
        return item;
    }

    /// <summary>
    /// Helper to check whether the target's held item was taken away.
    /// </summary>
    private static bool ItemWasRemoved(IBattlePokemon pokemon) =>
        pokemon.ReceivedCalls().Any(c => c.GetMethodInfo().Name == "TryStealHeldItem");

    /// <summary>
    /// Bulbapedia: "The move destroys any Berries held by hit Pokémon." A held Berry is removed from the
    /// target.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_TargetHoldsBerry_BerryIsRemoved()
    {
        // Arrange
        var berry = CreateItem("oran_berry", ItemCategory.Berry);
        var (script, move, target, _, _) = CreateTestSetup(berry);

        // Act
        script.OnSecondaryEffect(move, target, 0);

        // Assert
        await Assert.That(ItemWasRemoved(target)).IsTrue();
    }

    /// <summary>
    /// Bulbapedia: "The move destroys any Berries held by hit Pokémon" — the destruction is announced
    /// through a <see cref="DialogEvent"/> so the battle log can show it.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_TargetHoldsBerry_FiresItemIncineratedDialogEvent()
    {
        // Arrange
        var berry = CreateItem("oran_berry", ItemCategory.Berry);
        var (script, move, target, _, eventHook) = CreateTestSetup(berry);
        DialogEvent? captured = null;
        eventHook.Handler += (_, args) =>
        {
            if (args is DialogEvent dialogEvent)
                captured = dialogEvent;
        };

        // Act
        script.OnSecondaryEffect(move, target, 0);

        // Assert
        await Assert.That(captured).IsNotNull();
        await Assert.That(captured!.Message).IsEqualTo("item_incinerated");
    }

    /// <summary>
    /// Bulbapedia: only Berries (and, from Gen VI, Gems) are destroyed. A regular held item is left alone.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_TargetHoldsRegularItem_ItemIsNotRemoved()
    {
        // Arrange
        var item = CreateItem("leftovers", ItemCategory.MiscItem);
        var (script, move, target, _, _) = CreateTestSetup(item);

        // Act
        script.OnSecondaryEffect(move, target, 0);

        // Assert
        await Assert.That(ItemWasRemoved(target)).IsFalse();
    }

    /// <summary>
    /// Bulbapedia (Generation VI onwards): "The move now also destroys Gems." A held Gem is removed from
    /// the target.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_TargetHoldsGem_GemIsRemoved()
    {
        // Arrange
        var gem = CreateItem("normal_gem", ItemCategory.MiscItem);
        var (script, move, target, _, _) = CreateTestSetup(gem);

        // Act
        script.OnSecondaryEffect(move, target, 0);

        // Assert
        await Assert.That(ItemWasRemoved(target)).IsTrue();
    }

    /// <summary>
    /// Bulbapedia: "Incinerate inflicts damage to all adjacent opponents." Destroying a Berry is a bonus
    /// effect: against a target holding nothing the move still simply deals its damage, it does not fail.
    /// </summary>
    [Test]
    public void OnSecondaryEffect_TargetHoldsNoItem_HitIsNotMarkedAsFailed()
    {
        // Arrange
        var (script, move, target, hitData, _) = CreateTestSetup(null);

        // Act
        script.OnSecondaryEffect(move, target, 0);

        // Assert
        hitData.DidNotReceive().Fail();
    }
}