using PkmnLib.Dynamic.Models;
using PkmnLib.Dynamic.ScriptHandling;
using PkmnLib.Dynamic.ScriptHandling.Registry;
using PkmnLib.Plugin.Gen7.Common;
using PkmnLib.Plugin.Gen7.Scripts.Moves;
using PkmnLib.Plugin.Gen7.Scripts.Pokemon;
using PkmnLib.Plugin.Gen7.Scripts.Side;
using PkmnLib.Static;
using PkmnLib.Static.Species;
using PkmnLib.Static.Utils;

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

/// <summary>
/// Tests for the <see cref="HyperspaceFury"/> move script.
/// Gen VII Bulbapedia behavior: "Hyperspace Fury inflicts damage, then lowers the user's Defense stat by one
/// stage." "It bypasses accuracy checks to always hit, unless the target is in the semi-invulnerable turn of
/// a move such as Dig or Fly." "It will also hit the target even if it is protected by Protect, Detect,
/// Spiky Shield, King's Shield, Mat Block, or Baneful Bunker, and lifts the effects of those moves for the
/// remainder of the turn. It also removes the effects of Quick Guard, Wide Guard, and Crafty Shield from the
/// target's side of the field." "It hits through a substitute." "Hyperspace Fury can only be successfully
/// used by Hoopa as Hoopa Unbound (or a Pokémon that has transformed into Hoopa Unbound)."
/// </summary>
public class HyperspaceFuryTests
{
    /// <summary>
    /// Creates a fully mocked test setup where the target has a real <see cref="ScriptSet"/> as its volatile
    /// script set.
    /// </summary>
    private static (HyperspaceFury script, IExecutingMove move, IBattlePokemon target, IBattlePokemon user, IScriptSet
        volatileSet) CreateTestSetup()
    {
        var script = new HyperspaceFury();
        var move = Substitute.For<IExecutingMove>();
        var target = Substitute.For<IBattlePokemon>();
        target.GetScripts().Returns(_ => new ScriptIterator(Array.Empty<IEnumerable<ScriptContainer>>()));
        IScriptSet volatileSet = new ScriptSet(target);
        target.Volatile.Returns(volatileSet);

        var user = Substitute.For<IBattlePokemon>();
        move.User.Returns(user);
        return (script, move, target, user, volatileSet);
    }

    /// <summary>
    /// Extends the test setup with a battle side that has a real <see cref="ScriptSet"/> as its volatile
    /// scripts, so side-wide protections such as <see cref="QuickGuardEffect"/> can be attached.
    /// </summary>
    private static IScriptSet AttachSide(IBattlePokemon target)
    {
        var side = Substitute.For<IBattleSide>();
        side.GetScripts().Returns(_ => new ScriptIterator(Array.Empty<IEnumerable<ScriptContainer>>()));
        IScriptSet sideScripts = new ScriptSet(side);
        side.VolatileScripts.Returns(sideScripts);

        var battle = Substitute.For<IBattle>();
        battle.Sides.Returns(new[] { side });

        target.Battle.Returns(battle);
        target.SideIndex.Returns((byte)0);
        target.BattleSide.Returns(side);

        return sideScripts;
    }

    /// <summary>
    /// Bulbapedia: "It will also hit the target even if it is protected by Protect, Detect, Spiky Shield,
    /// King's Shield, Mat Block, or Baneful Bunker, and lifts the effects of those moves for the remainder
    /// of the turn." — the target's <see cref="ProtectionEffectScript"/> (Protect/Detect) is removed.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_TargetUsedProtect_ProtectionEffectRemoved()
    {
        // Arrange
        var (script, move, target, _, volatileSet) = CreateTestSetup();
        volatileSet.Add(new ProtectionEffectScript());

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

        // Assert
        await Assert.That(volatileSet.Contains(ScriptUtils.ResolveName<ProtectionEffectScript>())).IsFalse();
    }

    /// <summary>
    /// Bulbapedia: "It will also hit the target even if it is protected by Protect, Detect, Spiky Shield,
    /// King's Shield, Mat Block, or Baneful Bunker, and lifts the effects of those moves for the remainder
    /// of the turn." — a target under Spiky Shield has its <see cref="SpikyShieldEffect"/> removed.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_TargetUnderSpikyShield_ProtectionEffectRemoved()
    {
        // Arrange
        var (script, move, target, _, volatileSet) = CreateTestSetup();
        volatileSet.Add(new SpikyShieldEffect());

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

        // Assert
        await Assert.That(volatileSet.Contains(ScriptUtils.ResolveName<SpikyShieldEffect>())).IsFalse();
    }

    /// <summary>
    /// Bulbapedia: "It will also hit the target even if it is protected by Protect, Detect, Spiky Shield,
    /// King's Shield, Mat Block, or Baneful Bunker, and lifts the effects of those moves for the remainder
    /// of the turn." — a target under King's Shield has its <see cref="KingsShieldEffect"/> effect removed.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_TargetUnderKingsShield_ProtectionEffectRemoved()
    {
        // Arrange
        var (script, move, target, _, volatileSet) = CreateTestSetup();
        volatileSet.Add(new KingsShieldEffect());

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

        // Assert
        await Assert.That(volatileSet.Contains(ScriptUtils.ResolveName<KingsShieldEffect>())).IsFalse();
    }

    /// <summary>
    /// Bulbapedia: "It will also hit the target even if it is protected by Protect, Detect, Spiky Shield,
    /// King's Shield, Mat Block, or Baneful Bunker, and lifts the effects of those moves for the remainder
    /// of the turn." — a target under Baneful Bunker has its <see cref="BanefulBunkerEffect"/> removed.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_TargetUnderBanefulBunker_ProtectionEffectRemoved()
    {
        // Arrange
        var (script, move, target, _, volatileSet) = CreateTestSetup();
        volatileSet.Add(new BanefulBunkerEffect());

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

        // Assert
        await Assert.That(volatileSet.Contains(ScriptUtils.ResolveName<BanefulBunkerEffect>())).IsFalse();
    }

    /// <summary>
    /// With no protection effect on the target, the secondary effect simply does nothing and does not throw.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_TargetNotProtected_DoesNothing()
    {
        // Arrange
        var (script, move, target, _, volatileSet) = CreateTestSetup();

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

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

    /// <summary>
    /// Bulbapedia: "Hyperspace Fury inflicts damage, then lowers the user's Defense stat by one stage."
    /// The self-inflicted Defense drop is applied via <see cref="IBattlePokemon.ChangeStatBoost"/>.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_DamageDealt_LowersUserDefenseByOneStage()
    {
        // Arrange
        var (script, move, target, user, _) = CreateTestSetup();

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

        // Assert - the user received a self-inflicted ChangeStatBoost(Defense, -1) call.
        var call = user.ReceivedCalls().FirstOrDefault(c => c.GetMethodInfo().Name == "ChangeStatBoost");
        await Assert.That(call).IsNotNull();
        var arguments = call!.GetArguments();
        await Assert.That((Statistic)arguments[0]!).IsEqualTo(Statistic.Defense);
        await Assert.That((sbyte)arguments[1]!).IsEqualTo((sbyte)-1);
        await Assert.That((bool)arguments[2]!).IsTrue();
    }

    /// <summary>
    /// Gives the mocked user an explicit species and form name.
    /// </summary>
    private static void SetUserSpeciesForm(IBattlePokemon user, string speciesName, string formName)
    {
        var species = Substitute.For<ISpecies>();
        species.Name.Returns(new StringKey(speciesName));
        var form = Substitute.For<IForm>();
        form.Name.Returns(new StringKey(formName));
        user.Species.Returns(species);
        user.Form.Returns(form);
    }

    /// <summary>
    /// Bulbapedia: "Hyperspace Fury can only be successfully used by Hoopa as Hoopa Unbound (or a Pokémon
    /// that has transformed into Hoopa Unbound)." — used by any other Pokémon, the move fails
    /// ("But &lt;Pokémon&gt; can't use the move!").
    /// </summary>
    [Test]
    public async Task FailMove_UserNotHoopaUnbound_MoveFails()
    {
        // Arrange - the user is a different species entirely.
        var (script, move, _, user, _) = CreateTestSetup();
        SetUserSpeciesForm(user, "garchomp", "default");
        var fail = false;

        // Act
        ((IScriptFailMove)script).FailMove(move, ref fail);

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

    /// <summary>
    /// Bulbapedia: "Hyperspace Fury can only be successfully used by Hoopa as Hoopa Unbound" — used by
    /// Hoopa in its Confined (default) form, the move fails ("But Hoopa can't use it the way it is now!").
    /// </summary>
    [Test]
    public async Task FailMove_UserHoopaConfined_MoveFails()
    {
        // Arrange - the user is Hoopa, but in its default (Confined) form.
        var (script, move, _, user, _) = CreateTestSetup();
        SetUserSpeciesForm(user, "hoopa", "default");
        var fail = false;

        // Act
        ((IScriptFailMove)script).FailMove(move, ref fail);

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

    /// <summary>
    /// Bulbapedia: "Hyperspace Fury can only be successfully used by Hoopa as Hoopa Unbound" — used by
    /// Hoopa Unbound itself, the move does not fail.
    /// </summary>
    [Test]
    public async Task FailMove_UserHoopaUnbound_MoveDoesNotFail()
    {
        // Arrange - the user is Hoopa in its Unbound form.
        var (script, move, _, user, _) = CreateTestSetup();
        SetUserSpeciesForm(user, "hoopa", "unbound");
        var fail = false;

        // Act
        ((IScriptFailMove)script).FailMove(move, ref fail);

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

    /// <summary>
    /// Bulbapedia: "It also removes the effects of Quick Guard, Wide Guard, and Crafty Shield from the
    /// target's side of the field." — the <see cref="QuickGuardEffect"/> is removed from the target's side.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_QuickGuardOnTargetSide_SideEffectRemoved()
    {
        // Arrange
        var (script, move, target, _, _) = CreateTestSetup();
        var sideScripts = AttachSide(target);
        sideScripts.Add(new QuickGuardEffect());

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

        // Assert
        await Assert.That(sideScripts.Contains(ScriptUtils.ResolveName<QuickGuardEffect>())).IsFalse();
    }

    /// <summary>
    /// Bulbapedia: "It also removes the effects of Quick Guard, Wide Guard, and Crafty Shield from the
    /// target's side of the field." — the <see cref="WideGuardEffect"/> is removed from the target's side.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_WideGuardOnTargetSide_SideEffectRemoved()
    {
        // Arrange
        var (script, move, target, _, _) = CreateTestSetup();
        var sideScripts = AttachSide(target);
        sideScripts.Add(new WideGuardEffect());

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

        // Assert
        await Assert.That(sideScripts.Contains(ScriptUtils.ResolveName<WideGuardEffect>())).IsFalse();
    }

    /// <summary>
    /// Bulbapedia: "It also removes the effects of Quick Guard, Wide Guard, and Crafty Shield from the
    /// target's side of the field." — the <see cref="CraftyShieldEffect"/> is removed from the target's side.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_CraftyShieldOnTargetSide_SideEffectRemoved()
    {
        // Arrange
        var (script, move, target, _, _) = CreateTestSetup();
        var sideScripts = AttachSide(target);
        sideScripts.Add(new CraftyShieldEffect());

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

        // Assert
        await Assert.That(sideScripts.Contains(ScriptUtils.ResolveName<CraftyShieldEffect>())).IsFalse();
    }

    /// <summary>
    /// Bulbapedia: "It will also hit the target even if it is protected by Protect, Detect, Spiky Shield,
    /// King's Shield, Mat Block, or Baneful Bunker, and lifts the effects of those moves for the remainder
    /// of the turn." — Mat Block is a side-wide effect in this implementation
    /// (<see cref="MatBlockEffect"/>), and it is lifted as well.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_MatBlockOnTargetSide_SideEffectRemoved()
    {
        // Arrange
        var (script, move, target, _, _) = CreateTestSetup();
        var sideScripts = AttachSide(target);
        sideScripts.Add(new MatBlockEffect());

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

        // Assert
        await Assert.That(sideScripts.Contains(ScriptUtils.ResolveName<MatBlockEffect>())).IsFalse();
    }

    /// <summary>
    /// Bulbapedia: "It bypasses accuracy checks to always hit, unless the target is in the semi-invulnerable
    /// turn of a move such as Dig or Fly."
    /// Integration check: the Gen7 data gives hyperspace_fury an accuracy of 255, which the engine treats as
    /// an unmodifiable always-hit.
    /// </summary>
    [Test]
    public async Task MoveData_HyperspaceFury_BypassesAccuracyChecks()
    {
        // Arrange
        var library = LibraryHelpers.LoadLibrary();

        // Act
        var found = library.StaticLibrary.Moves.TryGet("hyperspace_fury", out var moveData);

        // Assert
        await Assert.That(found).IsTrue();
        await Assert.That(moveData!.Accuracy).IsEqualTo((byte)255);
    }

    /// <summary>
    /// Bulbapedia: "It hits through a substitute."
    /// Integration check: the Gen7 data gives hyperspace_fury the <see cref="MoveFlags.IgnoreSubstitute"/>
    /// flag.
    /// </summary>
    [Test]
    public async Task MoveData_HyperspaceFury_IgnoresSubstitute()
    {
        // Arrange
        var library = LibraryHelpers.LoadLibrary();

        // Act
        var found = library.StaticLibrary.Moves.TryGet("hyperspace_fury", out var moveData);

        // Assert
        await Assert.That(found).IsTrue();
        await Assert.That(moveData!.HasFlag(MoveFlags.IgnoreSubstitute)).IsTrue();
    }

    /// <summary>
    /// Bulbapedia: "It will also hit the target even if it is protected by Protect, Detect, Spiky Shield,
    /// King's Shield, Mat Block, or Baneful Bunker".
    /// Integration check: <see cref="ProtectionEffectScript.BlockIncomingHit"/> blocks any move carrying the
    /// <see cref="MoveFlags.Protect"/> flag before <see cref="HyperspaceFury.OnSecondaryEffect"/> can run,
    /// so hyperspace_fury's data must not carry that flag for the move to hit protected targets.
    /// </summary>
    [Test]
    public async Task MoveData_HyperspaceFury_NotBlockedByProtection()
    {
        // Arrange
        var library = LibraryHelpers.LoadLibrary();

        // Act
        var found = library.StaticLibrary.Moves.TryGet("hyperspace_fury", out var moveData);

        // Assert
        await Assert.That(found).IsTrue();
        await Assert.That(moveData!.HasFlag(MoveFlags.Protect)).IsFalse();
    }
}