using System;
using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;
using System.Windows.Forms;
using RokettoLaunch.DTOs.SaveFile;
using RyzStudio.Windows.Forms;

namespace RokettoLaunch.Forms
{
    public class LoadingForm : Form
    {
        private TProgressBar progressBar1;
        private RyzStudio.Windows.ThemedForms.ThUserControl userControl1;
        private RyzStudio.Windows.ThemedForms.ThUserControl userControl2;
        private TProgressBar progressBar2;

        private App4Options result = null;
        private Label label1;
        private Label label2;
        private string loadFilename = "";


        public LoadingForm()
        {
            InitializeComponent();

            UISetup.Dialog(this, true);

            this.Text = "Loading";
        }


        private void InitializeComponent()
        {
            progressBar1 = new TProgressBar();
            userControl1 = new RyzStudio.Windows.ThemedForms.ThUserControl();
            userControl2 = new RyzStudio.Windows.ThemedForms.ThUserControl();
            progressBar2 = new TProgressBar();
            label1 = new Label();
            label2 = new Label();
            userControl1.SuspendLayout();
            userControl2.SuspendLayout();
            SuspendLayout();
            //
            // progressBar1
            //
            progressBar1.BarColour = System.Drawing.Color.FromArgb(158, 225, 249);
            progressBar1.Dock = DockStyle.Fill;
            progressBar1.EnableMovable = false;
            progressBar1.Location = new System.Drawing.Point(3, 3);
            progressBar1.Maximum = 100;
            progressBar1.Minimum = 0;
            progressBar1.Name = "progressBar1";
            progressBar1.OnProgressChanged = null;
            progressBar1.ShowText = true;
            progressBar1.Size = new System.Drawing.Size(418, 18);
            progressBar1.TabIndex = 156;
            progressBar1.Value = 25;
            //
            // userControl1
            //
            userControl1.Anchor = AnchorStyles.Bottom | AnchorStyles.Left | AnchorStyles.Right;
            userControl1.BackColor = System.Drawing.Color.Transparent;
            userControl1.Controls.Add(progressBar1);
            userControl1.EnableMovable = false;
            userControl1.Location = new System.Drawing.Point(10, 64);
            userControl1.Name = "userControl1";
            userControl1.Size = new System.Drawing.Size(424, 24);
            userControl1.TabIndex = 157;
            //
            // userControl2
            //
            userControl2.Anchor = AnchorStyles.Bottom | AnchorStyles.Left | AnchorStyles.Right;
            userControl2.BackColor = System.Drawing.Color.Transparent;
            userControl2.Controls.Add(progressBar2);
            userControl2.EnableMovable = false;
            userControl2.Location = new System.Drawing.Point(10, 98);
            userControl2.Name = "userControl2";
            userControl2.Size = new System.Drawing.Size(424, 24);
            userControl2.TabIndex = 158;
            //
            // progressBar2
            //
            progressBar2.BarColour = System.Drawing.Color.FromArgb(158, 225, 249);
            progressBar2.Dock = DockStyle.Fill;
            progressBar2.EnableMovable = false;
            progressBar2.Location = new System.Drawing.Point(3, 3);
            progressBar2.Maximum = 100;
            progressBar2.Minimum = 0;
            progressBar2.Name = "progressBar2";
            progressBar2.OnProgressChanged = null;
            progressBar2.ShowText = true;
            progressBar2.Size = new System.Drawing.Size(418, 18);
            progressBar2.TabIndex = 156;
            progressBar2.Value = 25;
            //
            // label1
            //
            label1.AutoSize = true;
            label1.Location = new System.Drawing.Point(10, 20);
            label1.Name = "label1";
            label1.Size = new System.Drawing.Size(59, 15);
            label1.TabIndex = 159;
            label1.Text = "Loading...";
            //
            // label2
            //
            label2.AutoSize = true;
            label2.Location = new System.Drawing.Point(10, 40);
            label2.Name = "label2";
            label2.Size = new System.Drawing.Size(59, 15);
            label2.TabIndex = 160;
            label2.Text = "Loading...";
            //
            // LoadingForm
            //
            BackColor = System.Drawing.Color.White;
            ClientSize = new System.Drawing.Size(444, 141);
            Controls.Add(label2);
            Controls.Add(label1);
            Controls.Add(userControl2);
            Controls.Add(userControl1);
            Name = "LoadingForm";
            Text = "Edit Section";
            userControl1.ResumeLayout(false);
            userControl2.ResumeLayout(false);
            ResumeLayout(false);
            PerformLayout();
        }

        protected async override void OnShown(EventArgs e)
        {
            base.OnShown(e);

            await Task.Run(async () =>
            {
                this.Clear();

                UIControl.SetText(label1, "Loading...");
                UIControl.SetText(label2, "... " + Path.GetFileName(loadFilename));

                var newSession = await LoadSaveSessionWithVersion(loadFilename);

                // Update progress bars
                progressBar1.Maximum = newSession.Groups?.Count ?? 0;
                progressBar2.Maximum = 0;

                UIControl.SetText(label1, "Counting...");
                UIControl.SetText(label2, "");

                foreach (var group in newSession?.Groups ?? new List<App4Options.Group>())
                {
                    UIControl.SetText(label2, "... " + group.Title);

                    foreach (var item in group?.Items ?? new List<App4Options.Item>())
                    {
                        if (item.IsGroup)
                        {
                            progressBar2.Maximum += item.Items?.Count ?? 0;
                        }
                        else
                        {
                            progressBar2.Maximum++;
                        }
                    }
                }

                // Resolve paths
                progressBar2.Value = 0;

                UIControl.SetText(label1, "Seeking...");
                UIControl.SetText(label2, "");

                // Resolve paths
                foreach (var group in newSession?.Groups ?? new List<App4Options.Group>())
                {
                    foreach (var item in group?.Items ?? new List<App4Options.Item>())
                    {
                        progressBar1.Value++;

                        UIControl.SetText(label2, "... " + group.Title);

                        if (item.IsGroup)
                        {
                            foreach (var subItem in item.Items ?? new List<App4Options.Item>())
                            {
                                progressBar2.Value++;

                                UIControl.SetText(label2, "... " + subItem.Title);

                                subItem.ResolvePaths();
                            }
                        }
                        else
                        {
                            progressBar2.Value++;

                            UIControl.SetText(label2, "... " + item.Title);

                            item.ResolvePaths();
                        }
                    }
                }

                result = newSession;

                UIControl.SetText(label1, "Done");
                UIControl.SetText(label2, "Done");
            });

            this.DialogResult = DialogResult.OK;
        }

        protected override void OnFormClosing(FormClosingEventArgs e)
        {
            base.OnFormClosing(e);

            if (this.DialogResult != DialogResult.OK)
            {
                e.Cancel = true;
            }
        }

        public App4Options Result
        {
            get => result ?? new App4Options();
        }


        public async Task<DialogResult> ShowDialog(string filename)
        {
            loadFilename = filename;

            return this.ShowDialog();
        }

        public void Clear()
        {
            UIControl.SetText(label1, "Ready");
            UIControl.SetText(label2, "");

            progressBar1.Value = progressBar1.Maximum = 0;
            progressBar2.Value = progressBar2.Maximum = 0;
        }

        private async Task<App4Options> LoadSaveSessionWithVersion(string filename)
        {
            var result = new App4Options();

            if (string.IsNullOrWhiteSpace(filename))
            {
                return result;
            }

            var fileExtension = Path.GetExtension(filename?.ToLower()?.Trim() ?? string.Empty);
            if (string.IsNullOrWhiteSpace(fileExtension))
            {
                return result;
            }

            // Load session, assume version 3.
            App3Options loadSession = null;
            switch (fileExtension)
            {
                case ".json":
                case ".jsonfig":
                    loadSession = await RyzStudio.Text.Json.JsonSerialiser.DeserialiseFile<App3Options>(filename);
                    break;
                case ".jsnx":
                    loadSession = await RyzStudio.IO.Compression.ZFile.ReadFile<App3Options>(filename, "Document.json");
                    break;
                default:
                    break;
            }

            if (loadSession == null)
            {
                return result;
            }

            // File likely not correct schema.
            if (loadSession.FileVersion <= 0)
            {
                return result;
            }

            // Load session, if version 4.
            if (loadSession.FileVersion == 4)
            {
                switch (fileExtension)
                {
                    case ".json":
                    case ".jsonfig":
                        result = await RyzStudio.Text.Json.JsonSerialiser.DeserialiseFile<App4Options>(filename);
                        break;
                    case ".jsnx":
                        result = await RyzStudio.IO.Compression.ZFile.ReadFile<App4Options>(filename, "Document.json");
                        break;
                    default:
                        break;
                }

            }

            if (result == null)
            {
                return new App4Options();
            }

            // Convert version 3 to 4.
            if (loadSession.FileVersion == 3)
            {
                result.Load(loadSession);
            }

            return result;
        }

    }
}