using EMSystem.Forms;
using FontAwesome.Sharp;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace EMSystem
{
    public partial class AppForm : Form
    {
        // fields
		//currently active button on title panel
        private IconButton crntBtn; 
		// colorized panel on left side on currently used button
        private Panel leftSideBar;
		// currently used form
        private Form crntUsedForm;
        private IconPictureBox title = new IconPictureBox();
        // constructor
        public AppForm()
        {
            InitializeComponent();
			// defying left side panel 
            leftSideBar = new Panel
            {
				// defying sizes for width and height
                Size = new Size(7, 60)
            };
            navigationPanel.Controls.Add(leftSideBar);
            this.FormBorderStyle = FormBorderStyle.None;
            this.title.Location = this.Location;
            this.title.Width = this.Width;
            this.title.Height = 50;
            this.title.BackColor = Color.Black;
            this.Controls.Add(this.title);
            this.MaximizedBounds = Screen.FromHandle(this.Handle).WorkingArea;
        }
        // struct for RGB colors to use when switching forms
        private struct RGBC
        {
            public static Color color1 = Color.FromArgb(232, 23, 93);
            public static Color color2 = Color.FromArgb(204, 82, 122);
            public static Color color3 = Color.FromArgb(249, 205, 173);
            public static Color color4 = Color.FromArgb(249, 88, 155);
        }
        // Methods
        //Currently actively used button
        private void ActBtn(object senderBtn, Color color)
        {
            if (senderBtn != null)
            {
                DisableActBtn();
                crntBtn = (IconButton)senderBtn;
                crntBtn.BackColor = Color.FromArgb(54, 54, 54);
                crntBtn.ForeColor = color;
                crntBtn.TextAlign = ContentAlignment.MiddleCenter;
                crntBtn.IconColor = color;
                crntBtn.Font = new System.Drawing.Font("Century Gothic", 9.75F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
                crntBtn.TextImageRelation = TextImageRelation.TextBeforeImage;
                crntBtn.ImageAlign = ContentAlignment.MiddleRight;
                leftSideBar.BackColor = color;
                leftSideBar.Location = new Point(0, crntBtn.Location.Y);
                leftSideBar.Visible = true;
                leftSideBar.BringToFront();
                crntUsedFormIcon.IconChar = crntBtn.IconChar;
                crntUsedFormIcon.IconColor = color;        
            }
        }
        //disables active used button if the form isn't curently used
        private void DisableActBtn()
        {
            if(crntBtn != null)
            {
                crntBtn.BackColor = Color.FromArgb(71, 71, 71);
                crntBtn.ForeColor = Color.Gainsboro;
                crntBtn.TextAlign = ContentAlignment.MiddleLeft;
                crntBtn.IconColor = Color.Gainsboro;
                crntBtn.Font = new System.Drawing.Font("Century Gothic", 9.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
                crntBtn.TextImageRelation = TextImageRelation.ImageBeforeText;
                crntBtn.ImageAlign = ContentAlignment.MiddleLeft;
            }
        }
        //opens different form
        private void OpenForm(Form crntForm)
        {
            if(crntUsedForm != null)
            {
                crntUsedForm.Close();
            }
            crntUsedForm = crntForm;
            crntForm.TopLevel = false;
            crntForm.FormBorderStyle = FormBorderStyle.None;
            crntForm.Dock = DockStyle.Fill;
            desktopPanel.Controls.Add(crntForm);
            desktopPanel.Tag = crntForm;
            crntForm.BringToFront();
            crntForm.Show();
            crntUsedFormTitle.Text = crntForm.Text;
        }
        // home screen button
        private void homeBtn_Click(object sender, EventArgs e)
        {
            ActBtn(sender, 
			RGBC.color1 // uses RGB color from struct
			);
			// if statement to check if any form is currently used
            if (crntUsedForm != null)
            {
				// if used, then closes
                crntUsedForm.Close();
            }
			// when closes current form or there isn't any, then reset method is called
            Reset();
        }
        // pressing on logo returns back to home screen
        private void logoPic_Click(object sender, EventArgs e)
        {
			// closes current used form
            crntUsedForm.Close();
			// resets back to home screen
            Reset();
        }
		// reset method to return home screen
        private void Reset()
        {
            DisableActBtn();
            crntBtn.BackColor = Color.FromArgb(54, 54, 54);
            crntBtn.ForeColor = Color.FromArgb(232, 23, 93);
            crntBtn.TextAlign = ContentAlignment.MiddleCenter;
            crntBtn.IconColor = Color.FromArgb(232, 23, 93);
            crntBtn.Font = new System.Drawing.Font("Century Gothic", 9.75F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            crntBtn.TextImageRelation = TextImageRelation.TextBeforeImage;
            crntBtn.ImageAlign = ContentAlignment.MiddleRight;
            leftSideBar.Visible = true;
            leftSideBar.Location = new Point(0, homeBtn.Location.Y);
            leftSideBar.BackColor = Color.FromArgb(232, 23, 93);
            crntUsedFormIcon.IconChar = IconChar.Home;
            crntUsedFormIcon.IconColor = Color.FromArgb(232, 23, 93);
            crntUsedFormTitle.Text = "Home";
        }
        // draggable window
        [DllImport("user32.DLL", EntryPoint = "ReleaseCapture")]
        private extern static void ReleaseCapture();
        [DllImport("user32.DLL", EntryPoint = "SendMessage")]
        private extern static void SendMessage(System.IntPtr hWnd, int wMsg, int wParam, int lParam);
        private void titlePanel_MouseDown(object sender, MouseEventArgs e)
        {
            ReleaseCapture();
            SendMessage(this.Handle, 0x112, 0xf012, 0);
        }
        // close application button
        private void exitBtn_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }
        // maximizing application button
        private void maxBtn_Click(object sender, EventArgs e)
        {
            if (this.WindowState == FormWindowState.Normal)
            {
                this.WindowState = FormWindowState.Maximized;
            }
            else 
            {
                this.WindowState = FormWindowState.Normal;
            }
        }
        // minimizing application button
        private void minBtn_Click(object sender, EventArgs e)
        {
            WindowState = FormWindowState.Minimized;
        }
        
        private void AppForm_Load(object sender, EventArgs e)
        {
			// date and time on application home screen
            timeTimer.Start();
            labelDate.Text = DateTime.Now.ToString("dddd , dd. MMMM, yyyy").ToUpper(); // format for date
            labelTime.Text = DateTime.Now.ToString("HH:mm"); // format for time
        }
        private void timeTimer_Tick(object sender, EventArgs e)
        {
            labelTime.Text = DateTime.Now.ToString("HH:mm");
            timeTimer.Start();
        }
        // double click with right mouse button to minimize/maximize screen
        private void titlePanel_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            if (this.WindowState == FormWindowState.Normal)
            {
                this.WindowState = FormWindowState.Maximized;
            }
            else
            {
                this.WindowState = FormWindowState.Normal;
            }
        }
        //opens add employee popup form
        private void addEmpBtn_Click(object sender, EventArgs e)
        {
            //background form for "popup" form
            Form BGForm = new Form();
            try
            {
                using(AddEmpForm popup = new AddEmpForm())
                {
                    BGForm.StartPosition = FormStartPosition.Manual;
                    BGForm.FormBorderStyle = FormBorderStyle.None;
                    BGForm.Opacity = .50d;
                    BGForm.BackColor = Color.Black;
                    BGForm.WindowState = FormWindowState.Maximized;
                    BGForm.Location = this.Location;
                    BGForm.ShowInTaskbar = false;
                    BGForm.Show();
                    popup.Owner = BGForm;
                    popup.ShowDialog();
                    BGForm.Dispose();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                BGForm.Dispose();
            }
        }
        //opens employees list form
        private void empListBtn_Click_1(object sender, EventArgs e)
        {
            ActBtn(sender, 
			RGBC.color3 // uses color3 from RGB color struct
			);
            OpenForm(new EmpListForm());
        }
        // opens todolist form
        private void toDoListBtn_Click_1(object sender, EventArgs e)
        {
            ActBtn(sender, 
			RGBC.color4 // uses color4 from RGB color struct
			);
            OpenForm(new ToDoListForm());
        }
    }
}