using PkmnLib.Dynamic.Models;
using PkmnLib.Dynamic.ScriptHandling;
using PkmnLib.Dynamic.ScriptHandling.Registry;
using PkmnLib.Plugin.Gen7.Scripts.Moves;
using PkmnLib.Plugin.Gen7.Scripts.Pokemon;

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

/// <summary>
/// Tests for the <see cref="FakeOut"/> move script.
/// Gen VII Bulbapedia behavior: "Fake Out inflicts damage and always makes the target flinch, unless it has
/// the Ability Inner Focus or Shield Dust." and "Fake Out will fail if not used on the first turn the user
/// is out."
/// </summary>
public class FakeOutTests
{
    /// <summary>
    /// Creates a fully mocked test setup where the user switched in on the given turn and the battle is
    /// currently on the given turn.
    /// </summary>
    private static (FakeOut script, IExecutingMove move) CreateStopSetup(uint switchInTurn, uint currentTurn)
    {
        var script = new FakeOut();
        var move = Substitute.For<IExecutingMove>();

        var battle = Substitute.For<IBattle>();
        battle.CurrentTurnNumber.Returns(currentTurn);
        var battleData = Substitute.For<IPokemonBattleData>();
        battleData.Battle.Returns(battle);
        battleData.SwitchInTurn.Returns(switchInTurn);

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

        return (script, move);
    }

    /// <summary>
    /// Bulbapedia: "Fake Out will fail if not used on the first turn the user is out." — on the first turn
    /// the user is on the field (its switch-in turn), the move is not stopped. This includes Pokémon sent
    /// out later in the battle, as the check is against the turn the user came out, not the battle's first
    /// turn.
    /// </summary>
    [Test, Arguments(1u, 1u), Arguments(5u, 5u)]
    public async Task StopBeforeMove_FirstTurnOnField_MoveNotStopped(uint switchInTurn, uint currentTurn)
    {
        // Arrange
        var (script, move) = CreateStopSetup(switchInTurn, currentTurn);
        var stop = false;

        // Act
        script.StopBeforeMove(move, ref stop);

        // Assert
        await Assert.That(stop).IsFalse();
    }

    /// <summary>
    /// Bulbapedia: "Fake Out will fail if not used on the first turn the user is out." — on any later turn
    /// the move is stopped.
    /// </summary>
    [Test, Arguments(1u, 2u), Arguments(1u, 10u), Arguments(4u, 5u)]
    public async Task StopBeforeMove_LaterTurnOnField_MoveStopped(uint switchInTurn, uint currentTurn)
    {
        // Arrange
        var (script, move) = CreateStopSetup(switchInTurn, currentTurn);
        var stop = false;

        // Act
        script.StopBeforeMove(move, ref stop);

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

    /// <summary>
    /// Technical test: without battle data on the user (outside of battle) the first-turn check does nothing
    /// and the move is not stopped.
    /// </summary>
    [Test]
    public async Task StopBeforeMove_UserHasNoBattleData_MoveNotStopped()
    {
        // Arrange
        var script = new FakeOut();
        var move = Substitute.For<IExecutingMove>();
        var user = Substitute.For<IPokemon>();
        user.BattleData.Returns((IPokemonBattleData?)null);
        move.User.Returns(user);
        var stop = false;

        // Act
        script.StopBeforeMove(move, ref stop);

        // Assert
        await Assert.That(stop).IsFalse();
    }

    /// <summary>
    /// Bulbapedia: "Fake Out inflicts damage and always makes the target flinch" — the secondary effect puts
    /// a <see cref="FlinchEffect"/> on the target.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_AddsFlinchEffectToTarget()
    {
        // Arrange
        var script = new FakeOut();
        var move = Substitute.For<IExecutingMove>();
        var target = Substitute.For<IPokemon>();
        target.GetScripts().Returns(_ => new ScriptIterator(Array.Empty<IEnumerable<ScriptContainer>>()));
        IScriptSet volatileSet = new ScriptSet(target);
        target.Volatile.Returns(volatileSet);

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

        // Assert
        await Assert.That(volatileSet.Contains(ScriptUtils.ResolveName<FlinchEffect>())).IsTrue();
    }
}