using pkNX.Structures;

namespace pkNX.Randomization;

/// <summary>
/// <see cref="EvolutionSet"/> randomizer.
/// </summary>
public class EvolutionRandomizer : Randomizer
{
    private readonly EvolutionSet[] Evolutions;
    private readonly GameInfo Game;
    private readonly IPersonalTable Personal;
    public readonly SpeciesRandomizer RandSpec;
    public readonly FormRandomizer RandForm;

    public EvolutionRandomizer(GameInfo game, EvolutionSet[] evolutions, IPersonalTable t)
    {
        Game = game;
        Personal = t;
        Evolutions = evolutions;
        RandSpec = new SpeciesRandomizer(Game, t);
        RandForm = new FormRandomizer(t);
    }

    public override void Execute()
    {
        for (var i = 0; i < Evolutions.Length; i++)
        {
            var evo = Evolutions[i];
            if (Personal[i].HP == 0)
                continue;
            Randomize(evo, i);
        }
    }

    public void ExecuteTrade()
    {
        for (var i = 0; i < Evolutions.Length; i++)
        {
            var evo = Evolutions[i];
            ReplaceTradeMethods(evo, i);
        }
    }

    public void ExecuteEvolveEveryLevel()
    {
        for (var i = 0; i < Evolutions.Length; i++)
        {
            var evo = Evolutions[i];
            if (Personal[i].HP == 0)
                continue;
            Personal[i].EXPGrowth = (int)EXPGroup.Slow; // keep everything the same to preserve levels after evolving
            MakeEvolveEveryLevel(evo, i);
        }
    }

    private void Randomize(EvolutionSet evos, int species)
    {
        foreach (var evo in evos.PossibleEvolutions)
        {
            if (evo.Method == 0)
                continue;
            evo.Species = (ushort)RandSpec.GetRandomSpecies(evo.Species, species);
            evo.Form = (byte)RandForm.GetRandomForm(evo.Species, false, false, Game.Generation, Personal.Table);
        }
    }

    private void ReplaceTradeMethods(EvolutionSet evos, int species)
    {
        for (var i = 0; i < evos.PossibleEvolutions.Length; i++)
        {
            var evo = evos.PossibleEvolutions[i];
            ReplaceTradeMethod(evo, species, i);
        }
    }

    private void ReplaceTradeMethod(EvolutionMethod evo, int species, int evoIndex)
    {
        switch (evo.Method)
        {
            case EvolutionType.Trade when Game.Generation == 6:
                evo.Method = EvolutionType.LevelUp; // trade -> level up
                evo.Argument = 30;
                return;
            case EvolutionType.Trade when Game.Generation >= 7:
                evo.Method = EvolutionType.LevelUp; // trade -> level up
                evo.Level = 30;
                return;
            case EvolutionType.TradeHeldItem:
                evo.Method = EvolutionType.LevelUpHeldItemDay;
                return;
            case EvolutionType.TradeShelmetKarrablast:
                evo.Method = EvolutionType.LevelUpWithTeammate;
                if (species == (int)Species.Karrablast)
                    evo.Argument = (int)Species.Shelmet; // Karrablast with Shelmet
                if (species == (int)Species.Shelmet)
                    evo.Argument = (int)Species.Karrablast; // Shelmet with Karrablast
                return;

            case EvolutionType.LevelUpVersion:
                evo.Method = evoIndex == 0 ? EvolutionType.LevelUpECl5 : EvolutionType.LevelUpECgeq5;
                evo.Argument = 0; // clear ver
                return;
            case EvolutionType.LevelUpVersionDay:
                evo.Method = EvolutionType.LevelUpFriendshipMorning;
                evo.Argument = 0; // clear ver
                return;
            case EvolutionType.LevelUpVersionNight:
                evo.Method = EvolutionType.LevelUpFriendshipNight;
                evo.Argument = 0; // clear ver
                return;
        }
    }

    private static void MakeEvolveEveryLevel(EvolutionSet evos, int species)
    {
        var evoSet = evos.PossibleEvolutions;
        evoSet[0] = new EvolutionMethod
        {
            Argument = 0, // clear
            Form = 0, // randomized later
            Level = 1,
            Method = EvolutionType.LevelUp,
            Species = (ushort)species, // randomized later
        };

        if (evoSet[1].HasData) // has other branched evolutions; remove them
        {
            for (int i = 1; i < evoSet.Length; i++)
                evoSet[i] = new EvolutionMethod();
        }
    }
}