using PkmnLib.Dynamic.Models;
using PkmnLib.Plugin.Gen7.Scripts.Moves;

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

/// <summary>
/// Tests for the <see cref="GrassKnot"/> move script.
/// Gen VII Bulbapedia behavior: "Grass Knot deals damage scaled by the target's weight rather than using a
/// fixed base power", with cutoffs at 10, 25, 50, 100 and 200 kilograms.
/// </summary>
public class GrassKnotTests
{
    /// <summary>
    /// Bulbapedia weight/power table: 0.1–9.9 kg → 20, 10.0–24.9 kg → 40, 25.0–49.9 kg → 60,
    /// 50.0–99.9 kg → 80, 100.0–199.9 kg → 100, 200.0 kg or more → 120. Each cutoff is tested on both
    /// sides of the boundary.
    /// </summary>
    [Test, Arguments(0.1f, (ushort)20), Arguments(9.9f, (ushort)20), Arguments(10.0f, (ushort)40),
     Arguments(24.9f, (ushort)40), Arguments(25.0f, (ushort)60), Arguments(49.9f, (ushort)60),
     Arguments(50.0f, (ushort)80), Arguments(99.9f, (ushort)80), Arguments(100.0f, (ushort)100),
     Arguments(199.9f, (ushort)100), Arguments(200.0f, (ushort)120), Arguments(999.9f, (ushort)120)]
    public async Task ChangeBasePower_TargetWeight_SetsBasePowerFromWeightTable(float weightInKg, ushort expectedPower)
    {
        // Arrange
        var script = new GrassKnot();
        var move = Substitute.For<IExecutingMove>();
        var target = Substitute.For<IPokemon>();
        target.WeightInKg.Returns(weightInKg);
        ushort basePower = 1;

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

        // Assert
        await Assert.That(basePower).IsEqualTo(expectedPower);
    }

    /// <summary>
    /// Bulbapedia: the base power depends only on the target's weight — the incoming base power value is
    /// fully replaced rather than modified.
    /// </summary>
    [Test]
    public async Task ChangeBasePower_HighIncomingBasePower_IsReplacedByWeightTableValue()
    {
        // Arrange
        var script = new GrassKnot();
        var move = Substitute.For<IExecutingMove>();
        var target = Substitute.For<IPokemon>();
        target.WeightInKg.Returns(5f);
        ushort basePower = 250;

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

        // Assert
        await Assert.That(basePower).IsEqualTo((ushort)20);
    }
}