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

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

/// <summary>
/// Tests for the <see cref="HealBell"/> move script.
/// Gen VII Bulbapedia behavior: "Heal Bell cures the user, all Pokémon in the user's party, and the user's
/// allies, of all status conditions (sleep, poison, paralysis, freeze, and burn)." Since Generation VI:
/// "Heal Bell no longer affects active Pokémon with the Ability Soundproof. Inactive Pokémon are healed
/// regardless of Abilities."
/// </summary>
public class HealBellTests
{
    /// <summary>
    /// Creates a mocked party member with a mocked <see cref="IPokemon.Volatile"/> set and
    /// <see cref="IPokemon.BattleData"/>, optionally active on the battlefield and with a named ability.
    /// </summary>
    private static IPokemon CreatePartyMember(bool onBattlefield = false, string? abilityName = null)
    {
        var pokemon = Substitute.For<IPokemon>();
        var volatileSet = Substitute.For<IScriptSet>();
        pokemon.Volatile.Returns(volatileSet);
        var battleData = Substitute.For<IPokemonBattleData>();
        battleData.IsOnBattlefield.Returns(onBattlefield);
        pokemon.BattleData.Returns(battleData);
        if (abilityName != null)
        {
            var ability = Substitute.For<IAbility>();
            ability.Name.Returns(new StringKey(abilityName));
            pokemon.ActiveAbility.Returns(ability);
        }

        return pokemon;
    }

    /// <summary>
    /// Creates a fully mocked test setup: the user plus the given other party members form a single party
    /// in the battle. Returns the script, the executing move and the user (which is the move's target in
    /// most tests, as Heal Bell targets the user's side).
    /// </summary>
    private static (HealBell script, IExecutingMove move, IPokemon user) CreateTestSetup(
        params IPokemon?[] otherPartyMembers)
    {
        var script = new HealBell();
        var user = CreatePartyMember(true);

        var members = new List<IPokemon?> { user };
        members.AddRange(otherPartyMembers);

        var party = Substitute.For<IPokemonParty>();
        party.GetEnumerator().Returns(_ => members.GetEnumerator());
        var battleParty = Substitute.For<IBattleParty>();
        battleParty.Party.Returns(party);

        var battle = Substitute.For<IBattle>();
        battle.Parties.Returns(new[] { battleParty });
        user.BattleData!.Battle.Returns(battle);

        var move = Substitute.For<IExecutingMove>();
        move.User.Returns(user);

        return (script, move, user);
    }

    /// <summary>
    /// Helper that checks whether a mocked Pokémon received a <see cref="IPokemon.ClearStatus"/> call.
    /// </summary>
    private static bool ReceivedClearStatus(IPokemon pokemon) =>
        pokemon.ReceivedCalls().Any(c => c.GetMethodInfo().Name == "ClearStatus");

    /// <summary>
    /// Bulbapedia: "Heal Bell cures the user, all Pokémon in the user's party, and the user's allies, of all
    /// status conditions (sleep, poison, paralysis, freeze, and burn)." Every non-empty slot of the user's
    /// party is cured, including inactive Pokémon; empty party slots are skipped without throwing.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_TargetInUsersParty_CuresStatusOfAllPartyMembers()
    {
        // Arrange
        var inactiveMember = CreatePartyMember();
        var activeMember = CreatePartyMember(true);
        var (script, move, user) = CreateTestSetup(inactiveMember, activeMember, null);

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

        // Assert
        await Assert.That(ReceivedClearStatus(user)).IsTrue();
        await Assert.That(ReceivedClearStatus(inactiveMember)).IsTrue();
        await Assert.That(ReceivedClearStatus(activeMember)).IsTrue();
    }

    /// <summary>
    /// Bulbapedia: Heal Bell cures "all Pokémon in the user's party". A target that is not in any party
    /// (e.g. outside of the battle's known parties) results in no effect and no exception.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_TargetNotInAnyParty_DoesNothing()
    {
        // Arrange
        var (script, move, user) = CreateTestSetup();
        var strayTarget = CreatePartyMember();

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

        // Assert - nobody is cured because no party contains the target
        await Assert.That(ReceivedClearStatus(user)).IsFalse();
        await Assert.That(ReceivedClearStatus(strayTarget)).IsFalse();
    }

    /// <summary>
    /// Technical test: outside of battle the user has no <see cref="IPokemon.BattleData"/>; the script
    /// does nothing and does not throw.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_UserHasNoBattleData_DoesNothing()
    {
        // Arrange
        var (script, move, user) = CreateTestSetup();
        user.BattleData.Returns((IPokemonBattleData?)null);

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

        // Assert
        await Assert.That(ReceivedClearStatus(user)).IsFalse();
    }

    /// <summary>
    /// Bulbapedia (Generation VI, still applicable in Gen VII): "Inactive Pokémon are healed regardless of
    /// Abilities." A party member with Soundproof that is not on the battlefield is still cured.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_InactiveSoundproofPartyMember_StillCured()
    {
        // Arrange
        var soundproofMember = CreatePartyMember(false, "soundproof");
        var (script, move, user) = CreateTestSetup(soundproofMember);

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

        // Assert
        await Assert.That(ReceivedClearStatus(soundproofMember)).IsTrue();
    }

    /// <summary>
    /// Bulbapedia (Generation VI, still applicable in Gen VII): "Heal Bell no longer affects active Pokémon
    /// with the Ability Soundproof." An active party member with Soundproof is not cured.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_ActiveSoundproofPartyMember_NotCured()
    {
        // Arrange
        var soundproofMember = CreatePartyMember(true, "soundproof");
        var (script, move, user) = CreateTestSetup(soundproofMember);

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

        // Assert
        await Assert.That(ReceivedClearStatus(soundproofMember)).IsFalse();
    }

    /// <summary>
    /// Bulbapedia: Heal Bell cures "all status conditions (sleep, poison, paralysis, freeze, and burn)".
    /// Confusion is a volatile status, not a status condition, and is not cured by Heal Bell; a confused
    /// party member keeps its <see cref="Confusion"/> volatile script.
    /// </summary>
    [Test]
    public async Task OnSecondaryEffect_ConfusedPartyMember_ConfusionNotCured()
    {
        // Arrange
        var confusedMember = CreatePartyMember();
        var confusionKey = ScriptUtils.ResolveName<Confusion>();
        confusedMember.Volatile.Contains(confusionKey).Returns(true);
        var (script, move, user) = CreateTestSetup(confusedMember);

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

        // Assert - the confusion volatile is not removed
        await Assert.That(confusedMember.Volatile.ReceivedCalls().Any(c => c.GetMethodInfo().Name == "Remove"))
            .IsFalse();
    }
}