using PkmnLib.Dynamic.Models;
using PkmnLib.Dynamic.ScriptHandling.Registry;
using PkmnLib.Plugin.Gen7.Scripts.Moves;
using ElectricTerrainScript = PkmnLib.Plugin.Gen7.Scripts.Terrain.ElectricTerrain;

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

/// <summary>
/// Tests for the <see cref="ElectricTerrain"/> move script.
/// Gen VII Bulbapedia behavior (Generations VI to VII): Electric Terrain "envelops the field and replaces
/// the background environment and any other terrain that is already in effect."
/// </summary>
public class ElectricTerrainTests
{
    private static (ElectricTerrain script, IExecutingMove move, IBattle battle) CreateTestSetup()
    {
        var script = new ElectricTerrain();
        var move = Substitute.For<IExecutingMove>();

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

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

        return (script, move, battle);
    }

    /// <summary>
    /// Bulbapedia: Electric Terrain "envelops the field and replaces the background environment and any
    /// other terrain that is already in effect" — the move sets the battle's terrain to the
    /// <see cref="ElectricTerrainScript"/> terrain script.
    /// </summary>
    [Test]
    public void OnSecondaryEffect_SetsElectricTerrainOnBattle()
    {
        // Arrange
        var (script, move, battle) = CreateTestSetup();

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

        // Assert
        battle.Received(1).SetTerrain(ScriptUtils.ResolveName<ElectricTerrainScript>());
    }

    /// <summary>
    /// Technical test: without battle data on the user (outside of battle) the effect does nothing and
    /// does not throw.
    /// </summary>
    [Test]
    public void OnSecondaryEffect_UserHasNoBattleData_DoesNotSetTerrain()
    {
        // Arrange
        var (script, move, battle) = CreateTestSetup();
        move.User.BattleData.Returns((IPokemonBattleData?)null);

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

        // Assert
        battle.DidNotReceiveWithAnyArgs().SetTerrain(default);
    }
}