using System;
using System.Collections.Generic;
using System.IO;
using System.Windows.Forms;
using System.Linq;
using pk3DS.Core;

namespace pk3DS.WinForms;

public partial class TMEditor7 : Form
{
    public TMEditor7()
    {
        InitializeComponent();
        if (Main.ExeFSPath == null) { WinFormsUtil.Alert("No exeFS code to load."); Close(); }
        string[] files = Directory.GetFiles(Main.ExeFSPath);
        if (!File.Exists(files[0]) || !Path.GetFileNameWithoutExtension(files[0]).Contains("code")) { WinFormsUtil.Alert("No .code.bin detected."); Close(); }
        data = File.ReadAllBytes(files[0]);
        if (data.Length % 0x200 != 0) { WinFormsUtil.Alert(".code.bin not decompressed. Aborting."); Close(); }
        offset = Util.IndexOfBytes(data, Signature, 0x400000, 0) + Signature.Length;
        if (Main.Config.USUM)
            offset += 0x22;
        codebin = files[0];
        movelist[0] = "";
        SetupDGV();
        GetList();
    }

    private static readonly byte[] Signature = [0x03, 0x40, 0x03, 0x41, 0x03, 0x42, 0x03, 0x43, 0x03]; // tail end of item::ITEM_CheckBeads
    private readonly string codebin;
    private readonly string[] movelist = Main.Config.GetText(TextName.MoveNames);
    private readonly int offset = 0x0059795A; // Default
    private readonly byte[] data;
    private int dataoffset;

    private void GetDataOffset()
    {
        dataoffset = offset; // reset
    }

    private void SetupDGV()
    {
        dgvTM.Columns.Clear();
        var dgvIndex = new DataGridViewTextBoxColumn();
        {
            dgvIndex.HeaderText = "Index";
            dgvIndex.DisplayIndex = 0;
            dgvIndex.Width = 45;
            dgvIndex.ReadOnly = true;
            dgvIndex.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
            dgvIndex.SortMode = DataGridViewColumnSortMode.NotSortable;
        }
        var dgvMove = new DataGridViewComboBoxColumn();
        {
            dgvMove.HeaderText = "Move";
            dgvMove.DisplayIndex = 1;
            dgvMove.Items.AddRange(movelist); // add only the Names

            dgvMove.Width = 133;
            dgvMove.FlatStyle = FlatStyle.Flat;
            dgvIndex.SortMode = DataGridViewColumnSortMode.NotSortable;
        }
        dgvTM.Columns.Add(dgvIndex);
        dgvTM.Columns.Add(dgvMove);
    }

    private List<ushort> tms = [];

    private void GetList()
    {
        tms = [];
        dgvTM.Rows.Clear();

        GetDataOffset();
        for (int i = 0; i < 100; i++) // TMs stored sequentially
            tms.Add(BitConverter.ToUInt16(data, dataoffset + (2 * i)));

        ushort[] tmlist = [.. tms];
        for (int i = 0; i < tmlist.Length; i++)
        { dgvTM.Rows.Add(); dgvTM.Rows[i].Cells[0].Value = (i + 1).ToString(); dgvTM.Rows[i].Cells[1].Value = movelist[tmlist[i]]; }
    }

    private void SetList()
    {
        // Gather TM/HM list.
        tms = [];
        for (int i = 0; i < dgvTM.Rows.Count; i++)
            tms.Add((ushort)Array.IndexOf(movelist, dgvTM.Rows[i].Cells[1].Value));

        ushort[] tmlist = [.. tms];

        // Set TM/HM list in
        for (int i = 0; i < 100; i++)
            Array.Copy(BitConverter.GetBytes(tmlist[i]), 0, data, offset + (2 * i), 2);

        // Set Move Text Descriptions back into Item Text File
        string[] itemDescriptions = Main.Config.GetText(TextName.ItemFlavor);
        string[] moveDescriptions = Main.Config.GetText(TextName.MoveFlavor);
        for (int i = 1 - 1; i <= 92 - 1; i++) // TM01 - TM92
            itemDescriptions[328 + i] = moveDescriptions[tmlist[i]];
        for (int i = 93 - 1; i <= 95 - 1; i++) // TM92 - TM95
            itemDescriptions[618 + i - 92] = moveDescriptions[tmlist[i]];
        for (int i = 96 - 1; i <= 100 - 1; i++) // TM96 - TM100
            itemDescriptions[690 + i - 95] = moveDescriptions[tmlist[i]];
        Main.Config.SetText(TextName.ItemFlavor, itemDescriptions);
    }

    private void Form_Closing(object sender, FormClosingEventArgs e)
    {
        SetList();
        File.WriteAllBytes(codebin, data);
    }

    private void B_RandomTM_Click(object sender, EventArgs e)
    {
        if (WinFormsUtil.Prompt(MessageBoxButtons.YesNo, "Randomize TMs?", "Move compatibility will be the same as the base TMs.") != DialogResult.Yes) return;

        int[] randomMoves = Enumerable.Range(1, movelist.Length - 1).Select(i => i).ToArray();
        Util.Shuffle(randomMoves);

        int[] banned = [.. Legal.Z_Moves, .. new[] { 165, 464, 621 }];
        int ctr = 0;

        for (int i = 0; i < dgvTM.Rows.Count; i++)
        {
            int val = Array.IndexOf(movelist, dgvTM.Rows[i].Cells[1].Value);
            if (banned.Contains(val)) continue;
            while (banned.Contains(randomMoves[ctr])) ctr++;

            dgvTM.Rows[i].Cells[1].Value = movelist[randomMoves[ctr++]];
        }
        WinFormsUtil.Alert("Randomized!");
    }

    internal static ushort[] GetTMHMList()
    {
        if (Main.ExeFSPath == null)
            return [];
        string[] files = Directory.GetFiles(Main.ExeFSPath);
        if (!File.Exists(files[0]) || !Path.GetFileNameWithoutExtension(files[0]).Contains("code"))
            return [];
        byte[] data = File.ReadAllBytes(files[0]);
        int dataoffset = Util.IndexOfBytes(data, Signature, 0x400000, 0) + Signature.Length;
        if (data.Length % 0x200 != 0)
            return [];

        if (Main.Config.USUM)
            dataoffset += 0x22;
        List<ushort> tms = [];

        for (int i = 0; i < 100; i++) // TMs stored sequentially
            tms.Add(BitConverter.ToUInt16(data, dataoffset + (2 * i)));
        return [.. tms];
    }
}