using System;

namespace PKHeX.Core;

internal sealed class SAV2Offsets
{
    public SAV2Offsets(SAV2 sav)
    {
        Options = 0x2000;
        Trainer1 = 0x2009;

        if (sav.Japanese)
            LoadOffsetsJapanese(sav.Version);
        else if (sav.Korean)
            LoadOffsetsKorean();
        else
            LoadOffsetsInternational(sav.Version);
        Daycare = PokedexSeen + 0x1F + 28 + 1; // right after first Unown seen
        EventWork = EventFlag - 0x100;
    }

    public int RTCFlags { get; private set; } = -1;

    public int Options { get; }
    public int Trainer1 { get; }
    public int Rival { get; private set; }

    public int DaylightSavings { get; private set; } = -1;
    public int TimePlayed { get; private set; } = -1;
    public int Palette { get; private set; } = -1;
    public int Money { get; private set; } = -1;
    public int JohtoBadges { get; private set; } = -1;
    public int CurrentBoxIndex { get; private set; } = -1;
    public int BoxNames { get; private set; } = -1;
    public int Party { get; private set; } = -1;
    public int PokedexCaught { get; private set; } = -1;
    public int PokedexSeen { get; private set; } = -1;
    public int CurrentBox { get; private set; } = -1;
    public int OtherCurrentBox { get; private set; }
    public int Gender { get; private set; } = -1;
    public int AccumulatedChecksumEnd { get; private set; } = -1;
    public int OverallChecksumPosition { get; private set; } = -1;
    public int OverallChecksumPosition2 { get; private set; }
    public int EventFlag { get; private set; } = -1;
    public int EventWork { get; }
    public int Daycare { get; }

    public int BlueCardPoints { get; private set; } = -1;

    public int PouchTMHM { get; private set; } = -1;
    public int PouchItem { get; private set; } = -1;
    public int PouchKey { get; private set; } = -1;
    public int PouchBall { get; private set; } = -1;
    public int PouchPC { get; private set; } = -1;

    private void LoadOffsetsInternational(GameVersion version)
    {
        RTCFlags = 0x0C60;

        Rival = 0x2021;
        DaylightSavings = 0x2042;
        OtherCurrentBox = 0x284C;
        switch (version)
        {
            case GameVersion.GS:
                TimePlayed = 0x2053;
                Palette = 0x206B;
                Money = 0x23DB;
                JohtoBadges = 0x23E4;
                CurrentBoxIndex = 0x2724;
                BoxNames = 0x2727;
                Party = 0x288A;
                PokedexCaught = 0x2A4C;
                PokedexSeen = 0x2A6C;
                CurrentBox = 0x2D6C;
                Gender = -1; // No gender in GS
                AccumulatedChecksumEnd = 0x2D68;
                OverallChecksumPosition = 0x2D69;
                OverallChecksumPosition2 = 0x7E6D;

                PouchTMHM = 0x23E6;
                PouchItem = 0x241F;
                PouchKey  = 0x2449;
                PouchBall = 0x2464;
                PouchPC   = 0x247E;

                EventFlag = CurrentBoxIndex - 0x105;
                break;
            case GameVersion.C:
                TimePlayed = 0x2052;
                Palette = 0x206A;
                Money = 0x23DC;
                JohtoBadges = 0x23E5;
                CurrentBoxIndex = 0x2700;
                BoxNames = 0x2703;
                BlueCardPoints = 0x27D9;
                Party = 0x2865;
                PokedexCaught = 0x2A27;
                PokedexSeen = 0x2A47;
                CurrentBox = 0x2D10;
                Gender = 0x3E3D;
                AccumulatedChecksumEnd = 0x2B82;
                OverallChecksumPosition = 0x2D0D;
                OverallChecksumPosition2 = 0x1F0D;

                PouchTMHM = 0x23E7;
                PouchItem = 0x2420;
                PouchKey  = 0x244A;
                PouchBall = 0x2465;
                PouchPC   = 0x247F;

                EventFlag = CurrentBoxIndex - 0x100;
                break;

            default:
                throw new ArgumentOutOfRangeException(nameof(version), version, null);
        }
    }

    private void LoadOffsetsJapanese(GameVersion version)
    {
        Rival = 0x2017;
        DaylightSavings = 0x2029;
        TimePlayed = 0x2034;
        Palette = 0x204C;
        CurrentBox = 0x2D10;
        OtherCurrentBox = 0x2842;

        switch (version)
        {
            case GameVersion.GS:
                RTCFlags = 0x1000;

                Money = 0x23BC;
                JohtoBadges = 0x23C5;
                CurrentBoxIndex = 0x2705;
                BoxNames = 0x2708;
                Party = 0x283E;
                PokedexCaught = 0x29CE;
                PokedexSeen = 0x29EE;
                Gender = -1; // No gender in GS
                AccumulatedChecksumEnd = 0x2C8B;
                OverallChecksumPosition = 0x2D0D;
                OverallChecksumPosition2 = 0x7F0D;

                PouchTMHM = 0x23C7;
                PouchItem = 0x2400;
                PouchKey  = 0x242A;
                PouchBall = 0x2445;
                PouchPC   = 0x245F;

                EventFlag = CurrentBoxIndex - 0x105;
                break;
            case GameVersion.C:
                RTCFlags = 0x0C80;

                Money = 0x23BE;
                JohtoBadges = 0x23C7;
                CurrentBoxIndex = 0x26E2;
                BoxNames = 0x26E5;
                BlueCardPoints = 0x278E;
                Party = 0x281A;
                PokedexCaught = 0x29AA;
                PokedexSeen = 0x29CA;
                Gender = 0x8000;
                AccumulatedChecksumEnd = 0x2AE2;
                OverallChecksumPosition = 0x2D0D;
                OverallChecksumPosition2 = 0x7F0D;

                PouchTMHM = 0x23C9;
                PouchItem = 0x2402;
                PouchKey  = 0x242C;
                PouchBall = 0x2447;
                PouchPC   = 0x2461;

                EventFlag = CurrentBoxIndex - 0x100;
                break;

            default:
                throw new ArgumentOutOfRangeException(nameof(version), version, null);
        }
    }

    private void LoadOffsetsKorean()
    {
        RTCFlags = 0x1060;

        // No Crystal Version
        Rival = 0x2021;
        DaylightSavings = 0x2042;
        OtherCurrentBox = 0x284C;

        TimePlayed = 0x204D;
        Palette = 0x2065;
        Money = 0x23D3;
        JohtoBadges = 0x23DC;
        BoxNames = 0x26FF;
        Party = 0x28CC;
        PokedexCaught = 0x2A8E;
        PokedexSeen = 0x2AAE;
        CurrentBox = 0x2DAE;
        CurrentBoxIndex = 0x26FC;
        Gender = -1; // No gender in GS
        AccumulatedChecksumEnd = 0x2DAA;
        OverallChecksumPosition = 0x2DAB;
        OverallChecksumPosition2 = 0x7E6B;

        PouchTMHM = 0x23DE;
        PouchItem = 0x2417;
        PouchKey = 0x2441;
        PouchBall = 0x245C;
        PouchPC = 0x2476;

        EventFlag = CurrentBoxIndex - 0x105;
    }
}