using System;
using System.Collections;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Windows.Forms;

namespace PKHeX
{
    public partial class SAV_EventFlagsXY : Form
    {
        public SAV_EventFlagsXY()
        {
            InitializeComponent();
            Util.TranslateInterface(this, Main.curlanguage);

            AllowDrop = true;
            DragEnter += tabMain_DragEnter;
            DragDrop += tabMain_DragDrop;
            Setup();

            nud.Text = "0"; // Prompts an update for flag 0.
            // No Volcanic Ash in X/Y
        }
        private bool setup = true;
        private CheckBox[] chka;
        private readonly bool[] flags = new bool[3072];
        private readonly ushort[] Constants = new ushort[(Main.SAV.EventFlag - Main.SAV.EventConst) / 2];
        private void B_Cancel_Click(object sender, EventArgs e)
        {
            Close();
        }
        private void B_Save_Click(object sender, EventArgs e)
        {
            // Gather Updated Flags
            foreach (CheckBox flag in chka)
                flags[getFlagNum(flag)] = flag.Checked;

            byte[] data = new byte[flags.Length / 8];

            for (int i = 0; i < flags.Length; i++)
                if (flags[i])
                    data[i / 8] |= (byte)(1 << i % 8);

            Array.Copy(data, 0, Main.SAV.Data, Main.SAV.EventFlag, 0x180);

            // No Volcanic Ash in X/Y


            // Copy back Constants
            changeConstantIndex(null, null); // Trigger Saving
            for (int i = 0; i < Constants.Length; i++)
                Array.Copy(BitConverter.GetBytes(Constants[i]), 0, Main.SAV.Data, Main.SAV.EventConst + 2 * i, 2);

            Close();
        }
        private void Setup()
        {
            // Fill Bit arrays

            chka = new[] {
                flag_0001,flag_0002,flag_0003,flag_0004,flag_0005,
                flag_2237,flag_2238,flag_2239,
                flag_0115,flag_0963, // Mewtwo
                flag_0114,flag_0790, // Zygarde
                flag_0285,flag_0286,flag_0287,flag_0288,flag_0289, // Statuettes
                flag_0290,flag_0291,flag_0292,flag_0293,flag_0294, // Super Unlocks
                flag_0675, // Chatelaine 50
                flag_2546, // Pokedex
            };
            byte[] data = new byte[0x180];
            Array.Copy(Main.SAV.Data, Main.SAV.EventFlag, data, 0, 0x180);
            BitArray BitRegion = new BitArray(data);
            BitRegion.CopyTo(flags, 0);

            // Setup Event Constant Editor
            CB_Stats.Items.Clear();
            for (int i = 0; i < Constants.Length; i += 2)
            {
                CB_Stats.Items.Add($"0x{i.ToString("X3")}");
                Constants[i / 2] = BitConverter.ToUInt16(Main.SAV.Data, Main.SAV.EventConst + i);
            }
            CB_Stats.SelectedIndex = 0;

            // Populate Flags
            setup = true;
            popFlags();
        }
        private void popFlags()
        {
            if (!setup) return;
            foreach (CheckBox flag in chka)
                flag.Checked = flags[getFlagNum(flag)];

            changeCustomFlag(null, null);
        }

        private int getFlagNum(CheckBox chk)
        {
            try
            {
                string source = chk.Name;
                return Convert.ToInt32(source.Substring(Math.Max(0, source.Length - 4)));
            }
            catch { return 0; }
        }
        private void changeCustomBool(object sender, EventArgs e)
        {
            flags[(int)nud.Value] = CHK_CustomFlag.Checked;
            popFlags();
        }
        private void changeCustomFlag(object sender, EventArgs e)
        {
            int flag = (int)nud.Value;
            if (flag >= 3072)
            {
                CHK_CustomFlag.Checked = false;
                CHK_CustomFlag.Enabled = false;
                nud.BackColor = Color.Red;
            }
            else
            {
                CHK_CustomFlag.Enabled = true;
                nud.BackColor = Main.defaultControlWhite;
                CHK_CustomFlag.Checked = flags[flag];
            }
        }
        private void changeCustomFlag(object sender, KeyEventArgs e)
        {
            changeCustomFlag(null, (EventArgs)e);
        }

        private void toggleFlag(object sender, EventArgs e)
        {
            flags[getFlagNum((CheckBox)sender)] = ((CheckBox)sender).Checked;
            changeCustomFlag(sender, e);
        }

        private void changeSAV(object sender, EventArgs e)
        {
            if (TB_NewSAV.Text.Length > 0 && TB_OldSAV.Text.Length > 0)
            {
                diffSaves();
            }
        }
        private void diffSaves()
        {
            BitArray oldBits = new BitArray(olddata);
            BitArray newBits = new BitArray(newdata);

            string tbIsSet = "";
            string tbUnSet = "";
            for (int i = 0; i < oldBits.Length; i++)
            {
                if (oldBits[i] == newBits[i]) continue;
                if (newBits[i])
                    tbIsSet += i.ToString("0000") + ",";
                else
                    tbUnSet += i.ToString("0000") + ",";
            }
            TB_IsSet.Text = tbIsSet;
            TB_UnSet.Text = tbUnSet;
        }
        private readonly byte[] olddata = new byte[0x180];
        private readonly byte[] newdata = new byte[0x180];
        private void openSAV(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            if (ofd.ShowDialog() == DialogResult.OK)
                loadSAV(sender, ofd.FileName);
        }
        private void loadSAV(object sender, string path)
        {
            FileInfo fi = new FileInfo(path);
            byte[] eventflags;
            if (fi.Length == SAV6.SIZE_XY)
                eventflags = File.ReadAllBytes(path).Skip(Main.SAV.EventFlag).Take(0x180).ToArray();
            else
            {
                Util.Error("Invalid SAV Size", string.Format("File Size: 0x{1} ({0} bytes)", fi.Length, fi.Length.ToString("X5")), "File Loaded: " + path);
                return;
            }

            Button bs = (Button)sender;
            if (bs.Name == "B_LoadOld")
            { Array.Copy(eventflags, olddata, 0x180); TB_OldSAV.Text = path; }
            else
            { Array.Copy(eventflags, newdata, 0x180); TB_NewSAV.Text = path; }
        }
        int entry = -1;
        private void changeConstantIndex(object sender, EventArgs e)
        {
            if (entry > -1) // Set Entry
                Constants[entry] = (ushort)Math.Min(Util.ToUInt32(MT_Stat.Text), 0xFFFF);

            entry = CB_Stats.SelectedIndex; // Get Entry
            MT_Stat.Text = Constants[entry].ToString();
        }
        // Drag & Drop Events
        private void tabMain_DragEnter(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop)) e.Effect = DragDropEffects.Copy;
        }
        private void tabMain_DragDrop(object sender, DragEventArgs e)
        {
            string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);
            loadSAV(Util.Prompt(MessageBoxButtons.YesNo, "FlagDiff Researcher:", "Yes: Old Save" + Environment.NewLine + "No: New Save") == DialogResult.Yes ? B_LoadOld : B_LoadNew, files[0]);
        }
    }
}