using PkmnLib.Dynamic.Models;
using PkmnLib.Dynamic.ScriptHandling;
using PkmnLib.Plugin.Gen7.Scripts.Battle;
using PkmnLib.Plugin.Gen7.Scripts.Moves;
using PkmnLib.Static;

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

/// <summary>
/// Tests for the <see cref="MagicRoom"/> move script and the <see cref="MagicRoomEffect"/> battle volatile it
/// applies. Gen VII Bulbapedia behavior: "Magic Room suppresses the effect of all items held by the Pokémon on
/// the field. This effect lasts for five turns." Using the move again while active removes the effect
/// immediately.
/// </summary>
public class MagicRoomTests
{
    /// <summary>
    /// Creates a fully mocked test setup for Magic Room tests. The battle gets a real
    /// <see cref="ScriptSet"/> as its volatile set, so the applied effect can be inspected.
    /// </summary>
    private static (MagicRoom script, IExecutingMove move, IPokemon target, IBattle battle, IScriptSet battleVolatile)
        CreateTestSetup()
    {
        var script = new MagicRoom();
        var move = Substitute.For<IExecutingMove>();
        var target = Substitute.For<IPokemon>();

        var battle = Substitute.For<IBattle>();
        battle.GetScripts().Returns(_ => new ScriptIterator(new List<IEnumerable<ScriptContainer>>()));
        var battleVolatile = new ScriptSet(battle);
        battle.Volatile.Returns(battleVolatile);

        var battleData = Substitute.For<IPokemonBattleData>();
        battleData.Battle.Returns(battle);
        var user = Substitute.For<IPokemon>();
        user.BattleData.Returns(battleData);
        move.User.Returns(user);

        return (script, move, target, battle, battleVolatile);
    }

    /// <summary>
    /// Bulbapedia: "Magic Room suppresses the effect of all items held by the Pokémon on the field."
    /// The move script applies the <see cref="MagicRoomEffect"/> volatile, which implements the item
    /// suppression, to the battle.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_MoveUsed_AddsMagicRoomEffectToBattleVolatile()
    {
        // Arrange
        var (script, move, target, _, battleVolatile) = CreateTestSetup();

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

        // Assert
        await Assert.That(battleVolatile.Get<MagicRoomEffect>()).IsNotNull();
    }

    /// <summary>
    /// Bulbapedia: Magic Room affects "the Pokémon on the field"; a user without battle data has no field to
    /// affect, so no effect is applied and no exception is thrown.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_UserHasNoBattleData_NoEffectAdded()
    {
        // Arrange
        var (script, move, target, _, battleVolatile) = CreateTestSetup();
        move.User.BattleData.Returns((IPokemonBattleData?)null);

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

        // Assert
        await Assert.That(battleVolatile.Count).IsEqualTo(0);
    }

    /// <summary>
    /// Bulbapedia: "If Magic Room is used while it is already in effect, it will end immediately."
    /// Using the move a second time must remove the active effect from the battle instead of leaving it in
    /// place.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_UsedWhileActive_RemovesEffectImmediately()
    {
        // Arrange
        var (script, move, target, _, battleVolatile) = CreateTestSetup();

        // Act - second use while the effect is active
        script.OnSecondaryEffect(move, target, 0);
        script.OnSecondaryEffect(move, target, 0);

        // Assert
        await Assert.That(battleVolatile.Contains("magic_room")).IsFalse();
    }

    // ----- MagicRoomEffect behavior (the volatile the move applies) -----

    /// <summary>
    /// Bulbapedia: "Magic Room suppresses the effect of all items held by the Pokémon on the field."
    /// While the effect is active no Pokémon can consume its held item.
    /// </summary>
    [Test]
    public async Task PreventHeldItemConsume_MagicRoomActive_ItemConsumptionPrevented()
    {
        // Arrange
        var effect = new MagicRoomEffect();
        var pokemon = Substitute.For<IPokemon>();
        var item = Substitute.For<IItem>();
        var prevented = false;

        // Act
        effect.PreventHeldItemConsume(pokemon, item, ref prevented);

        // Assert
        await Assert.That(prevented).IsTrue();
    }

    /// <summary>
    /// Bulbapedia: "Magic Room suppresses the effect of all items held by the Pokémon on the field."
    /// The effect suppresses all item battle trigger scripts while active.
    /// </summary>
    [Test]
    public async Task OnBeforeAnyHookInvoked_NullCategoryList_SuppressesItemBattleTriggers()
    {
        // Arrange
        var effect = new MagicRoomEffect();
        List<ScriptCategory>? suppressedCategories = null;

        // Act
        effect.OnBeforeAnyHookInvoked(ref suppressedCategories);

        // Assert
        await Assert.That(suppressedCategories).IsNotNull();
        await Assert.That(suppressedCategories!.Contains(ScriptCategory.ItemBattleTrigger)).IsTrue();
    }

    /// <summary>
    /// Bulbapedia: "Magic Room suppresses the effect of all items held by the Pokémon on the field."
    /// When other suppressions are already present, the item suppression is added to the existing list.
    /// </summary>
    [Test]
    public async Task OnBeforeAnyHookInvoked_ExistingCategoryList_AddsItemBattleTriggerSuppression()
    {
        // Arrange
        var effect = new MagicRoomEffect();
        List<ScriptCategory>? suppressedCategories = [ScriptCategory.Weather];

        // Act
        effect.OnBeforeAnyHookInvoked(ref suppressedCategories);

        // Assert
        await Assert.That(suppressedCategories!.Contains(ScriptCategory.ItemBattleTrigger)).IsTrue();
        await Assert.That(suppressedCategories!.Contains(ScriptCategory.Weather)).IsTrue();
    }

    /// <summary>
    /// Bulbapedia: "This effect lasts for five turns." The turn Magic Room is used counts as the first turn,
    /// so after five end-of-turn ticks the effect must have removed itself from the battle.
    /// </summary>
    [Test]
    public async Task OnEndTurn_AfterFiveEndOfTurns_EffectHasEnded()
    {
        // Arrange
        var (script, move, target, battle, battleVolatile) = CreateTestSetup();
        script.OnSecondaryEffect(move, target, 0);
        var effect = battleVolatile.Get<MagicRoomEffect>()!;

        // Act - five end-of-turn ticks, the duration of the effect
        for (var i = 0; i < 5; i++)
            effect.OnEndTurn(battle, battle);

        // Assert
        await Assert.That(battleVolatile.Contains("magic_room")).IsFalse();
    }
}