using PkmnLib.Dynamic.Models;
using PkmnLib.Dynamic.ScriptHandling;
using PkmnLib.Plugin.Gen7.Scripts.Moves;
using PkmnLib.Plugin.Gen7.Scripts.Status;
using PkmnLib.Static.Species;
using PkmnLib.Static.Utils;

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

/// <summary>
/// Tests for the <see cref="Hex"/> move script.
/// Gen VII Bulbapedia behavior: Hex's base power "is 50 and will double to 100 when the target is affected by a
/// non-volatile status condition"; Generation VI onwards: "Hex's base power was increased to 65 and will double
/// to 130." Additionally, from the Comatose ability page: "The Pokémon with this Ability takes double damage from
/// Hex".
/// </summary>
public class HexTests
{
    /// <summary>
    /// Creates a fully mocked test setup where the target has the given (or no) non-volatile status in its
    /// <see cref="IBattlePokemon.StatusScript"/>.
    /// </summary>
    private static (Hex hex, IExecutingMove move, IBattlePokemon target) CreateTestSetup(Script? status)
    {
        var hex = new Hex();
        var move = Substitute.For<IExecutingMove>();
        var target = Substitute.For<IBattlePokemon>();
        target.StatusScript.Returns(status == null ? new ScriptContainer() : new ScriptContainer(status));
        move.User.Returns(Substitute.For<IBattlePokemon>());
        return (hex, move, target);
    }

    /// <summary>
    /// Every non-volatile status condition implemented in Gen 7.
    /// </summary>
    public static IEnumerable<Func<Script>> NonVolatileStatusScripts()
    {
        yield return () => new Burned();
        yield return () => new Poisoned();
        yield return () => new BadlyPoisoned();
        yield return () => new Paralyzed();
        yield return () => new Frozen();
        yield return () => new Sleep();
    }

    /// <summary>
    /// Bulbapedia: Hex "will double to 130 when the target is affected by a non-volatile status condition."
    /// Every non-volatile status (burn, poison, bad poison, paralysis, freeze, sleep) doubles the base power.
    /// </summary>
    [Test, MethodDataSource(nameof(NonVolatileStatusScripts))]
    public async Task ChangeBasePower_TargetHasNonVolatileStatus_BasePowerDoubles(Script status)
    {
        // Arrange
        var (hex, move, target) = CreateTestSetup(status);
        ushort basePower = 65;

        // Act
        hex.ChangeBasePower(move, target, 0, ref basePower);

        // Assert
        await Assert.That(basePower).IsEqualTo((ushort)130);
    }

    /// <summary>
    /// Bulbapedia: the base power only doubles "when the target is affected by a non-volatile status condition" —
    /// against a target with no status the base power is unchanged.
    /// </summary>
    [Test]
    public async Task ChangeBasePower_TargetHasNoStatus_BasePowerUnchanged()
    {
        // Arrange
        var (hex, move, target) = CreateTestSetup(null);
        ushort basePower = 65;

        // Act
        hex.ChangeBasePower(move, target, 0, ref basePower);

        // Assert
        await Assert.That(basePower).IsEqualTo((ushort)65);
    }

    /// <summary>
    /// Bulbapedia (Comatose ability page, Gen VII): "The Pokémon with this Ability takes double damage from Hex" —
    /// a target with <see cref="IBattlePokemon.ActiveAbility"/> Comatose gets the doubled base power even without a
    /// status condition.
    /// </summary>
    [Test]
    public async Task ChangeBasePower_TargetHasComatose_BasePowerDoubles()
    {
        // Arrange
        var (hex, move, target) = CreateTestSetup(null);
        var comatose = Substitute.For<IAbility>();
        comatose.Name.Returns(new StringKey("comatose"));
        target.ActiveAbility.Returns(comatose);
        ushort basePower = 65;

        // Act
        hex.ChangeBasePower(move, target, 0, ref basePower);

        // Assert
        await Assert.That(basePower).IsEqualTo((ushort)130);
    }

    /// <summary>
    /// Technical test: doubling a very large base power clamps at <see cref="ushort.MaxValue"/> instead of
    /// overflowing.
    /// </summary>
    [Test]
    public async Task ChangeBasePower_StatusedTargetWithLargeBasePower_ClampsAtMaxValue()
    {
        // Arrange
        var (hex, move, target) = CreateTestSetup(new Burned());
        ushort basePower = ushort.MaxValue - 100;

        // Act
        hex.ChangeBasePower(move, target, 0, ref basePower);

        // Assert
        await Assert.That(basePower).IsEqualTo(ushort.MaxValue);
    }
}