using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
using PKHeX.Core;
using PKHeX.Drawing.PokeSprite;
using static PKHeX.Core.MessageStrings;

namespace PKHeX.WinForms
{
    public partial class ReportGrid : Form
    {
        public ReportGrid()
        {
            InitializeComponent();
            dgData.DoubleBuffered(true);
            CenterToParent();
            GetContextMenu();
        }

        private void GetContextMenu()
        {
            var mnuHide = new ToolStripMenuItem { Name = "mnuHide", Text = MsgReportColumnHide };
            mnuHide.Click += (sender, e) =>
            {
                int c = dgData.SelectedCells.Count;
                if (c == 0)
                { WinFormsUtil.Alert(MsgReportColumnHideFail); return; }

                for (int i = 0; i < c; i++)
                    dgData.Columns[dgData.SelectedCells[i].ColumnIndex].Visible = false;
            };
            var mnuRestore = new ToolStripMenuItem { Name = "mnuRestore", Text = MsgReportColumnRestore };
            mnuRestore.Click += (sender, e) =>
            {
                int c = dgData.ColumnCount;
                for (int i = 0; i < c; i++)
                    dgData.Columns[i].Visible = true;

                WinFormsUtil.Alert(MsgReportColumnRestoreSuccess);
            };

            ContextMenuStrip mnu = new();
            mnu.Items.Add(mnuHide);
            mnu.Items.Add(mnuRestore);

            dgData.ContextMenuStrip = mnu;
        }

        private sealed class PokemonList<T> : SortableBindingList<T> where T : class { }

        public void PopulateData(IList<SlotCache> Data)
        {
            SuspendLayout();
            var PL = new PokemonList<EntitySummaryImage>();
            var strings = GameInfo.Strings;
            foreach (var entry in Data)
            {
                var pkm = entry.Entity;
                if ((uint)(pkm.Species - 1) >= pkm.MaxSpeciesID)
                {
                    continue;
                }
                pkm.Stat_Level = pkm.CurrentLevel; // recalc Level
                PL.Add(new EntitySummaryImage(pkm, strings, entry.Identify()));
            }

            dgData.DataSource = PL;
            dgData.AutoGenerateColumns = true;
            for (int i = 0; i < dgData.Columns.Count; i++)
            {
                var col = dgData.Columns[i];
                if (col is DataGridViewImageColumn)
                    continue; // Don't add sorting for Sprites
                col.SortMode = DataGridViewColumnSortMode.Automatic;
            }

            // Trigger Resizing
            dgData.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells;
            for (int i = 0; i < dgData.Columns.Count; i++)
            {
                int w = dgData.Columns[i].Width;
                dgData.Columns[i].AutoSizeMode = DataGridViewAutoSizeColumnMode.None;
                dgData.Columns[i].Width = w;
            }
            dgData.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.None;
            Data_Sorted(this, EventArgs.Empty); // trigger row resizing

            ResumeLayout();
        }

        private void Data_Sorted(object sender, EventArgs e)
        {
            int height = SpriteUtil.Spriter.Height + 1; // max height of a row, +1px
            for (int i = 0; i < dgData.Rows.Count; i++)
                dgData.Rows[i].Height = height;
        }

        private void PromptSaveCSV(object sender, FormClosingEventArgs e)
        {
            if (WinFormsUtil.Prompt(MessageBoxButtons.YesNo, MsgReportExportCSV) != DialogResult.Yes)
                return;
            using var savecsv = new SaveFileDialog
            {
                Filter = "Spreadsheet|*.csv",
                FileName = "Box Data Dump.csv",
            };
            if (savecsv.ShowDialog() == DialogResult.OK)
            {
                Hide();
                var path = savecsv.FileName;
                var t = Task.Run(() => Export_CSV(path));
                t.Wait(); // don't start disposing until the saving is complete
            }
        }

        private async Task Export_CSV(string path)
        {
            using var fs = new FileStream(path, FileMode.Create);
            using var s = new StreamWriter(fs);

            var headers = dgData.Columns.Cast<DataGridViewColumn>();
            await s.WriteLineAsync(string.Join(",", headers.Skip(1).Select(column => $"\"{column.HeaderText}\""))).ConfigureAwait(false);

            foreach (var cells in dgData.Rows.Cast<DataGridViewRow>().Select(row => row.Cells.Cast<DataGridViewCell>()))
                await s.WriteLineAsync(string.Join(",", cells.Skip(1).Select(cell => $"\"{cell.Value}\""))).ConfigureAwait(false);
        }

        protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
        {
            bool cp = keyData == (Keys.Control | Keys.C) && ActiveControl is DataGridView;
            if (!cp)
                return base.ProcessCmdKey(ref msg, keyData);

            var content = dgData.GetClipboardContent();
            if (content == null)
                return base.ProcessCmdKey(ref msg, keyData);

            string data = content.GetText();
            var dr = WinFormsUtil.Prompt(MessageBoxButtons.YesNo, MsgReportExportTable);
            if (dr != DialogResult.Yes)
            {
                WinFormsUtil.SetClipboardText(data);
                return true;
            }

            // Reformat datagrid clipboard content
            string[] lines = data.Split(new[] { Environment.NewLine }, StringSplitOptions.None);
            string[] newlines = ConvertTabbedToRedditTable(lines);
            WinFormsUtil.SetClipboardText(string.Join(Environment.NewLine, newlines));
            return true;
        }

        private static string[] ConvertTabbedToRedditTable(string[] lines)
        {
            string[] newlines = new string[lines.Length + 1];
            int tabcount = lines[0].Count(c => c == '\t');

            newlines[0] = lines[0].Replace('\t', '|');
            newlines[1] = string.Join(":--:", Enumerable.Repeat('|', tabcount + 2)); // 2 pipes for each end
            for (int i = 1; i < lines.Length; i++)
                newlines[i + 1] = lines[i].Replace('\t', '|');
            return newlines;
        }
    }
}