using System;
using System.Drawing;
using System.Windows.Forms;

namespace UPSNet
{
    /// <summary>
    /// A countdown dialog that appears before Windows shutdown is executed.
    /// Allows the user to cancel the shutdown during the countdown.
    /// </summary>
    public class ShutdownCountdownForm : Form
    {
        private Label labelTitle;
        private Label labelCountdown;
        private Label labelMessage;
        private Button buttonCancel;
        private Timer countdownTimer;
        private int remainingSeconds;
        
        /// <summary>
        /// True if user cancelled the shutdown
        /// </summary>
        public bool WasCancelled { get; private set; }
        
        /// <summary>
        /// True if countdown reached zero (proceed with shutdown)
        /// </summary>
        public bool CountdownFinished { get; private set; }
        
        public ShutdownCountdownForm(int seconds)
        {
            remainingSeconds = seconds;
            WasCancelled = false;
            CountdownFinished = false;
            InitializeUI();
            
            countdownTimer = new Timer();
            countdownTimer.Interval = 1000;
            countdownTimer.Tick += CountdownTimer_Tick;
        }
        
        private void InitializeUI()
        {
            this.SuspendLayout();
            
            // Form settings
            this.Text = "UPS Shutdown Warning";
            this.FormBorderStyle = FormBorderStyle.FixedDialog;
            this.StartPosition = FormStartPosition.CenterScreen;
            this.MaximizeBox = false;
            this.MinimizeBox = false;
            this.TopMost = true;
            this.ClientSize = new Size(340, 180);
            this.ShowInTaskbar = true;
            this.BackColor = Color.FromArgb(30, 30, 30);
            
            // Title label
            labelTitle = new Label();
            labelTitle.Text = "⚠ UPS Shutdown Warning";
            labelTitle.Font = new Font("Segoe UI", 11F, FontStyle.Bold);
            labelTitle.ForeColor = Color.OrangeRed;
            labelTitle.Location = new Point(12, 15);
            labelTitle.Size = new Size(316, 25);
            labelTitle.TextAlign = ContentAlignment.MiddleCenter;
            
            // Message label
            labelMessage = new Label();
            labelMessage.Text = "Sistem akan dimatikan dalam:";
            labelMessage.Font = new Font("Segoe UI", 9.5F);
            labelMessage.ForeColor = Color.White;
            labelMessage.Location = new Point(12, 50);
            labelMessage.Size = new Size(316, 20);
            labelMessage.TextAlign = ContentAlignment.MiddleCenter;
            
            // Countdown label
            labelCountdown = new Label();
            labelCountdown.Text = remainingSeconds.ToString() + " detik";
            labelCountdown.Font = new Font("Segoe UI", 22F, FontStyle.Bold);
            labelCountdown.ForeColor = Color.Red;
            labelCountdown.Location = new Point(12, 72);
            labelCountdown.Size = new Size(316, 45);
            labelCountdown.TextAlign = ContentAlignment.MiddleCenter;
            
            // Cancel button
            buttonCancel = new Button();
            buttonCancel.Text = "Cancel Shutdown";
            buttonCancel.Font = new Font("Segoe UI", 9.5F, FontStyle.Bold);
            buttonCancel.Location = new Point(70, 130);
            buttonCancel.Size = new Size(200, 35);
            buttonCancel.BackColor = Color.FromArgb(0, 150, 200);
            buttonCancel.ForeColor = Color.White;
            buttonCancel.FlatStyle = FlatStyle.Flat;
            buttonCancel.FlatAppearance.BorderSize = 0;
            buttonCancel.Cursor = Cursors.Hand;
            buttonCancel.Click += ButtonCancel_Click;
            
            this.Controls.Add(labelTitle);
            this.Controls.Add(labelMessage);
            this.Controls.Add(labelCountdown);
            this.Controls.Add(buttonCancel);
            
            this.ResumeLayout(false);
        }
        
        protected override void OnShown(EventArgs e)
        {
            base.OnShown(e);
            countdownTimer.Start();
            // Play a warning sound
            System.Media.SystemSounds.Exclamation.Play();
        }
        
        private void CountdownTimer_Tick(object sender, EventArgs e)
        {
            remainingSeconds--;
            
            if (remainingSeconds <= 0)
            {
                countdownTimer.Stop();
                CountdownFinished = true;
                labelCountdown.Text = "0 detik";
                this.Close();
            }
            else
            {
                labelCountdown.Text = remainingSeconds.ToString() + " detik";
                
                // Flash color when critical
                if (remainingSeconds <= 5)
                {
                    labelCountdown.ForeColor = (remainingSeconds % 2 == 0) ? Color.Red : Color.Yellow;
                }
            }
        }
        
        private void ButtonCancel_Click(object sender, EventArgs e)
        {
            countdownTimer.Stop();
            WasCancelled = true;
            CountdownFinished = false;
            this.Close();
        }
        
        protected override void OnFormClosing(FormClosingEventArgs e)
        {
            countdownTimer.Stop();
            base.OnFormClosing(e);
        }
        
        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (countdownTimer != null)
                {
                    countdownTimer.Dispose();
                }
            }
            base.Dispose(disposing);
        }
    }
}