using AppLauncher.Models;
using AppLauncher.Windows.Forms;
using Newtonsoft.Json;
using RyzStudio.Windows.Forms;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace AppLauncher
{
    public partial class MainForm : AForm
    {
        [DllImport("user32.dll")]
        protected static extern bool RegisterHotKey(IntPtr hWnd, int id, int fsModifiers, int vk);

        [DllImport("user32.dll")]
        protected static extern bool UnregisterHotKey(IntPtr hWnd, int id);

        //protected const int MOD_ALT = 0x1;
        //protected const int MOD_CONTROL = 0x2;
        //protected const int MOD_SHIFT = 0x4;
        //protected const int MOD_WIN = 0x8;
        protected const int WM_HOTKEY = 0x312;

        protected OptionsForm optionsForm = null;
        protected string sessionFilename = null;

        public MainForm() : base()
        {
            InitializeComponent();

            this.StartPosition = FormStartPosition.WindowsDefaultBounds;
        }

        protected override void OnLoad(EventArgs e)
        {
            ThreadControl.SetVisible(this, false);

            base.OnLoad(e);
        }

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

            string jsonfigFilename = Path.ChangeExtension(Application.ExecutablePath, "jsonfig");
            if (File.Exists(jsonfigFilename))
            {
                await loadFile(jsonfigFilename);
            }
            else
            {
                this.CurrentSession = new LauncherSession();
                ThreadControl.SetVisible(this, true);
            }
        }

        protected override void OnClosing(CancelEventArgs e)
        {
            base.OnClosing(e);

            if (this.CurrentSession == null) this.CurrentSession = new LauncherSession();

            if (string.IsNullOrWhiteSpace(sessionFilename))
            {
                // do nothing
            }
            else
            {
                if (this.CurrentSession.AutoSave == LauncherSession.AutoSaveOption.Prompt)
                {
                    DialogResult dr = MessageBox.Show("Save existing session?", "Exit", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question);
                    if (dr == DialogResult.Yes)
                    {
                        bool rv = saveFile(sessionFilename, false);
                        if (!rv)
                        {
                            e.Cancel = true;
                        }
                    }
                    else if (dr == DialogResult.No)
                    {
                        // do nothing
                    }
                    else if (dr == DialogResult.Cancel)
                    {
                        e.Cancel = true;
                    }
                }
                else if (this.CurrentSession.AutoSave == LauncherSession.AutoSaveOption.Yes)
                {
                    saveFile(sessionFilename, false);
                }
            }

            if (this.CurrentSession.HotKey != null)
            {
                if (this.CurrentSession.HotKey.KeyCode != Keys.None)
                {
                    UnregisterHotKey((IntPtr)Handle, 1);
                }
            }

        }

        protected override void WndProc(ref Message m)
        {
            base.WndProc(ref m);

            if (m.Msg != WM_HOTKEY) return;

            switch (m.WParam.ToInt32())
            {
                case 1:
                    this.Visible = !this.Visible;
                    break;
                default: break;
            }
        }

        public LauncherSession CurrentSession { get; set; } = null;

        /// <summary>
        /// New
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void toolStripMenuItem5_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrWhiteSpace(sessionFilename))
            {
                newSession();
            }
            else
            {
                DialogResult dr = MessageBox.Show("Save existing session?", "New session", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question);
                if (dr == DialogResult.Yes)
                {
                    bool rv = saveFile(sessionFilename, false);
                    if (rv)
                    {
                        newSession();

                        sessionFilename = null;
                    }
                }
                else if (dr == DialogResult.No)
                {
                    newSession();

                    sessionFilename = null;
                }
                else if (dr == DialogResult.Cancel)
                {
                    return;
                }
            }
        }

        /// <summary>
        /// Open
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private async void toolStripMenuItem7_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrWhiteSpace(sessionFilename))
            {
                if (openFileDialog1.ShowDialog() == DialogResult.OK)
                {
                    await loadFile(openFileDialog1.FileName);
                }
            }
            else
            {
                DialogResult dr = MessageBox.Show("Save existing session?", "Open session", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question);
                if (dr == DialogResult.Yes)
                {
                    bool rv = saveFile(sessionFilename, false);
                    if (rv)
                    {
                        if (openFileDialog1.ShowDialog() == DialogResult.OK)
                        {
                            await loadFile(openFileDialog1.FileName);
                        }
                    }
                }
                else if (dr == DialogResult.No)
                {
                    if (openFileDialog1.ShowDialog() == DialogResult.OK)
                    {
                        await loadFile(openFileDialog1.FileName);
                    }
                }
                else if (dr == DialogResult.Cancel)
                {
                    return;
                }
            }
        }

        /// <summary>
        /// Close
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void toolStripMenuItem8_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrWhiteSpace(sessionFilename))
            {
                flowLayoutPanel1.Controls.Clear();
            }
            else
            {
                DialogResult dr = MessageBox.Show("Save existing session?", "Close session", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Question);
                if (dr == DialogResult.Yes)
                {
                    bool rv = saveFile(sessionFilename, false);
                    if (rv)
                    {
                        flowLayoutPanel1.Controls.Clear();

                        sessionFilename = null;
                    }
                }
                else if (dr == DialogResult.No)
                {
                    flowLayoutPanel1.Controls.Clear();

                    sessionFilename = null;
                }
                else if (dr == DialogResult.Cancel)
                {
                    return;
                }
            }
        }

        /// <summary>
        /// Save
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void toolStripMenuItem6_Click(object sender, EventArgs e)
        {
            if (string.IsNullOrWhiteSpace(sessionFilename))
            {
                saveAsFile();
            }
            else
            {
                saveFile(sessionFilename, true);
            }
        }

        /// <summary>
        /// Save As
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void toolStripMenuItem2_Click(object sender, EventArgs e) => saveAsFile();

        /// <summary>
        /// Always On Top
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void toolStripMenuItem1_Click(object sender, EventArgs e) => this.TopMost = !this.TopMost;

        /// <summary>
        /// Exit
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void exitToolStripMenuItem_Click(object sender, EventArgs e) => this.Close();

        private void optionToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (optionsForm == null) optionsForm = new OptionsForm(this);
            optionsForm.ShowDialog();

            invalidateHotKey();
        }

        protected override void imageBox3_MouseClick(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                if (this.CurrentSession == null)
                {
                    this.Close();
                }
                else
                {
                    if (this.CurrentSession.HideOnClose)
                    {
                        this.Visible = !this.Visible;
                    }
                    else
                    {
                        this.Close();
                    }
                }
            }
        }

        protected async Task collapseWindow(int width, int increment = 6)
        {
            await Task.Run(() =>
            {
                while (this.Width > width)
                {
                    ThreadControl.SetWidth(this, (this.Width - increment));

                    Application.DoEvents();
                }

                ThreadControl.SetWidth(this, width);
            });
        }

        protected async Task expandWindow(int width, int increment = 8)
        {
            await Task.Run(() =>
            {
                while (this.Width < width)
                {
                    ThreadControl.SetWidth(this, (this.Width + increment));

                    Application.DoEvents();
                }

                ThreadControl.SetWidth(this, width);
            });
        }

        protected void invalidateHotKey()
        {
            if (this.InvokeRequired)
            {
                this.Invoke(new MethodInvoker(() =>
                {
                    UnregisterHotKey((IntPtr)Handle, 1);
                }));
            }
            else
            {
                UnregisterHotKey((IntPtr)Handle, 1);
            }

            if (this.CurrentSession.HotKey != null)
            {
                if (this.CurrentSession.HotKey.KeyCode != Keys.None)
                {
                    if (this.InvokeRequired)
                    {
                        this.Invoke(new MethodInvoker(() =>
                        {
                            RegisterHotKey((IntPtr)Handle, 1, this.CurrentSession.HotKey.ModifierCode, this.CurrentSession.HotKey.Key);
                        }));
                    }
                    else
                    {
                        RegisterHotKey((IntPtr)Handle, 1, this.CurrentSession.HotKey.ModifierCode, this.CurrentSession.HotKey.Key);
                    }
                }
            }
        }

        protected async Task loadFile(string filename)
        {
            await Task.Run(() =>
            {
                if (isBusy)
                {
                    return;
                }

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

                if (!File.Exists(filename))
                {
                    return;
                }

                string sourceCode = null;

                try
                {
                    sessionFilename = filename;

                    sourceCode = File.ReadAllText(sessionFilename);
                }
                catch (Exception exc)
                {
                    MessageBox.Show(exc.Message, "Load session");
                    return;
                }

                if (string.IsNullOrWhiteSpace(sourceCode))
                {
                    return;
                }

                LauncherSession loadedSession = JsonConvert.DeserializeObject<LauncherSession>(sourceCode);
                if (loadedSession == null)
                {
                    return;
                }

                // load options
                this.CurrentSession = loadedSession.ToSimple();

                // load tiles
                int maxWidth = 0;
                ThreadControl.Clear(flowLayoutPanel1);

                if (loadedSession.Groups != null)
                {
                    foreach (TileGroupModel item in loadedSession.Groups)
                    {
                        TTilePanelLayout panel = new TTilePanelLayout(item);
                        maxWidth = Math.Max(maxWidth, panel.Width);

                        ThreadControl.Add(flowLayoutPanel1, panel);
                    }
                }

                // ui
                ThreadControl.SetSize(this, (maxWidth + SystemInformation.VerticalScrollBarWidth + 20 + flowLayoutPanel1.Left), this.CurrentSession.DefaultHeight);

                //
                ThreadControl.SetTopMost(this, this.CurrentSession.AlwaysOnTop);
                ThreadControl.SetVisible(this, true);

                if (this.InvokeRequired)
                {
                    this.Invoke(new MethodInvoker(() => {
                        this.Focus();
                    }));
                }
                else
                {
                    this.Focus();
                }

                // hotkey
                invalidateHotKey();

            });
        }

        protected void newSession()
        {
            int maxWidth = 0;
            flowLayoutPanel1.Controls.Clear();

            TTilePanelLayout panel = new TTilePanelLayout(new TileGroupModel()
            {
                Title = "New Group",
                IsExpanded = true,
                GridSize = new Size(8, 1)
            });

            maxWidth = Math.Max(maxWidth, panel.Width);

            flowLayoutPanel1.Controls.Add(panel);

            this.Width = maxWidth + SystemInformation.VerticalScrollBarWidth + 20 + flowLayoutPanel1.Left;
        }

        protected bool saveFile(string filename, bool showNotices = true)
        {
            if (isBusy)
            {
                return false;
            }

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

            if (flowLayoutPanel1.Controls.Count <= 0)
            {
                return true;
            }

            isBusy = true;

            // update session
            this.CurrentSession.DefaultHeight = this.Height;
            this.CurrentSession.AlwaysOnTop = this.TopMost;

            // save
            LauncherSession saveSession = this.CurrentSession.ToSimple();
            saveSession.Groups = new List<TileGroupModel>();
            for (int i = 0; i < flowLayoutPanel1.Controls.Count; i++)
            {
                if (flowLayoutPanel1.Controls[i].GetType() != typeof(TTilePanelLayout))
                {
                    continue;
                }

                TTilePanelLayout container = flowLayoutPanel1.Controls[i] as TTilePanelLayout;
                saveSession.Groups.Add(container.Model);
            }

            try
            {
                File.WriteAllText(filename, JsonConvert.SerializeObject(saveSession));

                if (showNotices)
                {
                    MessageBox.Show("Session saved!", "Save session", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }
            }
            catch (Exception exc)
            {
                MessageBox.Show(exc.Message, "Save session");

                return false;
            }

            isBusy = false;

            return true;
        }

        protected bool saveAsFile()
        {
            if (isBusy)
            {
                return false;
            }

            if (saveFileDialog1.ShowDialog() == DialogResult.OK)
            {
                bool rv = saveFile(saveFileDialog1.FileName);
                if (rv)
                {
                    sessionFilename = saveFileDialog1.FileName;
                }

                return rv;
            }

            return false;
        }

        private void contextMenuStrip1_Opening(object sender, System.ComponentModel.CancelEventArgs e)
        {
            toolStripMenuItem1.Checked = this.TopMost;
            toolStripMenuItem6.Enabled = !string.IsNullOrWhiteSpace(sessionFilename);
        }

        private void viewHelpToolStripMenuItem_Click(object sender, EventArgs e)
        {
            try
            {
                System.Diagnostics.Process.Start("https://www.hiimray.co.uk/software-fizzy-launcher");
            }
            catch
            {
                // do nothing
            }
        }

        private void aboutToolStripMenuItem_Click(object sender, EventArgs e) => MessageBox.Show(Application.ProductName + " v" + Application.ProductVersion, "About", MessageBoxButtons.OK, MessageBoxIcon.Information);

    }
}