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

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

/// <summary>
/// Tests for the <see cref="Grudge"/> move script.
/// Gen VII Bulbapedia behavior: "When Grudge is used, if the user faints as the direct result of an
/// attack, the move which causes the user to faint will lose all of its PP."
/// The fainting-and-PP-drain logic itself lives in the <see cref="GrudgeEffect"/> volatile; this move
/// script is responsible for attaching that volatile to the user.
/// </summary>
public class GrudgeTests
{
    private static (Grudge script, IExecutingMove move, IPokemon user, IScriptSet userVolatile) CreateTestSetup()
    {
        var script = new Grudge();
        var move = Substitute.For<IExecutingMove>();

        var user = Substitute.For<IPokemon>();
        var userVolatile = Substitute.For<IScriptSet>();
        user.Volatile.Returns(userVolatile);
        move.User.Returns(user);

        return (script, move, user, userVolatile);
    }

    /// <summary>
    /// Bulbapedia: "When Grudge is used" the user starts bearing a grudge — the "grudge" volatile is
    /// attached to the user.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_Always_AddsGrudgeVolatileToUser()
    {
        // Arrange
        var (script, move, _, userVolatile) = CreateTestSetup();

        // Act
        script.OnSecondaryEffect(move, Substitute.For<IPokemon>(), 0);

        // Assert
        userVolatile.Received(1).StackOrAdd(new StringKey("grudge"), Arg.Any<Func<Script?>>());
        await Assert.That(userVolatile.ReceivedCalls().Any(c => c.GetMethodInfo().Name == "StackOrAdd")).IsTrue();
    }

    /// <summary>
    /// Bulbapedia: "the move which causes the user to faint will lose all of its PP" — the instantiation
    /// function passed to the volatile script set creates the <see cref="GrudgeEffect"/> script that
    /// implements this.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_GrudgeInstantiation_CreatesGrudgeEffectScript()
    {
        // Arrange
        var (script, move, user, userVolatile) = CreateTestSetup();
        user.Library.Returns(LibraryHelpers.LoadLibrary());

        // Act
        script.OnSecondaryEffect(move, Substitute.For<IPokemon>(), 0);

        // Assert
        var call = userVolatile.ReceivedCalls().First(c => c.GetMethodInfo().Name == "StackOrAdd");
        var instantiation = (Func<Script?>)call.GetArguments()[1]!;
        await Assert.That(instantiation() is GrudgeEffect).IsTrue();
    }

    /// <summary>
    /// Bulbapedia: the grudge is borne by the user, not the target — the target's volatile script set is
    /// left untouched.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_Always_DoesNotAddVolatileToTarget()
    {
        // Arrange
        var (script, move, _, _) = CreateTestSetup();
        var target = Substitute.For<IPokemon>();
        var targetVolatile = Substitute.For<IScriptSet>();
        target.Volatile.Returns(targetVolatile);

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

        // Assert
        await Assert.That(targetVolatile.ReceivedCalls().Any()).IsFalse();
    }
}