using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;

namespace DD2Switcher {
    public partial class SettingsForm : Form {
        private Label titleLabel;
        private FlowLayoutPanel windowsPanel;
        private Label statusLabel;
        private Button refreshButton;
        private Button closeButton;
        private int firstIndex = -1;
        private int lastIndex = -1;

        public SettingsForm() {
            InitializeComponent();
            LoadIcon();
            RefreshWindowsList();
        }

        private void InitializeComponent() {
            this.titleLabel = new Label();
            this.windowsPanel = new FlowLayoutPanel();
            this.statusLabel = new Label();
            this.refreshButton = new Button();
            this.closeButton = new Button();
            this.SuspendLayout();
            //
            // titleLabel
            //
            this.titleLabel.AutoSize = true;
            this.titleLabel.Font = new Font("Segoe UI", 14F, FontStyle.Bold);
            this.titleLabel.Location = new Point(20, 20);
            this.titleLabel.Name = "titleLabel";
            this.titleLabel.Size = new Size(200, 25);
            this.titleLabel.Text = "DD2Switcher Settings";
            //
            // windowsPanel
            //
            this.windowsPanel.AutoScroll = true;
            this.windowsPanel.BorderStyle = BorderStyle.FixedSingle;
            this.windowsPanel.Location = new Point(20, 60);
            this.windowsPanel.Name = "windowsPanel";
            this.windowsPanel.Size = new Size(560, 300);
            this.windowsPanel.Padding = new Padding(10);
            this.windowsPanel.BackColor = Color.White;
            //
            // statusLabel
            //
            this.statusLabel.AutoSize = true;
            this.statusLabel.Location = new Point(20, 380);
            this.statusLabel.Name = "statusLabel";
            this.statusLabel.Size = new Size(400, 15);
            this.statusLabel.Text = "DD2Switcher is running in the system tray.";
            //
            // refreshButton
            //
            this.refreshButton.Location = new Point(450, 375);
            this.refreshButton.Name = "refreshButton";
            this.refreshButton.Size = new Size(75, 23);
            this.refreshButton.Text = "Refresh";
            this.refreshButton.Click += new EventHandler(this.refreshButton_Click);
            //
            // closeButton
            //
            this.closeButton.Location = new Point(530, 375);
            this.closeButton.Name = "closeButton";
            this.closeButton.Size = new Size(75, 23);
            this.closeButton.Text = "Close";
            this.closeButton.Click += new EventHandler(this.closeButton_Click);
            //
            // SettingsForm
            //
            this.AutoScaleDimensions = new SizeF(6F, 13F);
            this.AutoScaleMode = AutoScaleMode.Font;
            this.ClientSize = new Size(600, 420);
            this.Controls.Add(this.titleLabel);
            this.Controls.Add(this.windowsPanel);
            this.Controls.Add(this.statusLabel);
            this.Controls.Add(this.refreshButton);
            this.Controls.Add(this.closeButton);
            this.Name = "SettingsForm";
            this.Text = "DD2Switcher Settings";
            this.StartPosition = FormStartPosition.CenterScreen;
            this.FormBorderStyle = FormBorderStyle.FixedSingle;
            this.MaximizeBox = false;
            this.MinimizeBox = false;
            this.ResumeLayout(false);
            this.PerformLayout();
        }

        private void closeButton_Click(object sender, EventArgs e) {
            this.Close();
        }

        private void refreshButton_Click(object sender, EventArgs e) {
            RefreshWindowsList();
        }

        private void RefreshWindowsList() {
            windowsPanel.Controls.Clear();

            // Get tracked windows from Program
            var trackedWindows = GetTrackedWindows();

            if (trackedWindows.Count == 0) {
                var noWindowsLabel = new Label();
                noWindowsLabel.Text = "No windows currently tracked";
                noWindowsLabel.AutoSize = true;
                noWindowsLabel.ForeColor = Color.Gray;
                noWindowsLabel.Font = new Font("Segoe UI", 10F);
                windowsPanel.Controls.Add(noWindowsLabel);
                return;
            }

            for (int i = 0; i < trackedWindows.Count; i++) {
                var window = trackedWindows[i];
                if (window == null)
                    continue;

                var windowPanel = CreateWindowPanel(i, window);
                windowsPanel.Controls.Add(windowPanel);
            }
        }

        private Panel CreateWindowPanel(int index, Process window) {
            var panel = new Panel();
            panel.Width = 520;
            panel.Height = 80;
            panel.BorderStyle = BorderStyle.FixedSingle;
            panel.Margin = new Padding(5);
            panel.BackColor = Color.LightGray;

            // Index label
            var indexLabel = new Label();
            indexLabel.Text = $"Index: {index}";
            indexLabel.Location = new Point(10, 5);
            indexLabel.AutoSize = true;
            indexLabel.Font = new Font("Segoe UI", 9F, FontStyle.Bold);
            panel.Controls.Add(indexLabel);

            // Process name
            var nameLabel = new Label();
            nameLabel.Text = $"Name: {window.ProcessName}";
            nameLabel.Location = new Point(10, 25);
            nameLabel.AutoSize = true;
            nameLabel.Font = new Font("Segoe UI", 9F);
            panel.Controls.Add(nameLabel);

            // PID
            var pidLabel = new Label();
            pidLabel.Text = $"PID: {window.Id}";
            pidLabel.Location = new Point(10, 45);
            pidLabel.AutoSize = true;
            pidLabel.Font = new Font("Segoe UI", 9F);
            panel.Controls.Add(pidLabel);

            // Window title
            var titleLabel = new Label();
            titleLabel.Text = $"Title: {window.MainWindowTitle}";
            titleLabel.Location = new Point(200, 25);
            titleLabel.AutoSize = true;
            titleLabel.Font = new Font("Segoe UI", 9F);
            titleLabel.MaximumSize = new Size(200, 0);
            panel.Controls.Add(titleLabel);

            // First/Last indicator
            var firstLastLabel = new Label();
            firstLastLabel.Text = GetFirstLastText(index);
            firstLastLabel.Location = new Point(200, 45);
            firstLastLabel.AutoSize = true;
            firstLastLabel.Font = new Font("Segoe UI", 9F, FontStyle.Bold);
            firstLastLabel.ForeColor = Color.DarkBlue;
            panel.Controls.Add(firstLastLabel);

            // Pick button
            var pickButton = new Button();
            pickButton.Text = "Pick";
            pickButton.Location = new Point(420, 10);
            pickButton.Size = new Size(50, 25);
            pickButton.Tag = index;
            pickButton.Click += PickButton_Click;
            panel.Controls.Add(pickButton);

            // Untrack button
            var untrackButton = new Button();
            untrackButton.Text = "Untrack";
            untrackButton.Location = new Point(420, 45);
            untrackButton.Size = new Size(50, 25);
            untrackButton.Tag = index;
            untrackButton.Click += UntrackButton_Click;
            panel.Controls.Add(untrackButton);

            return panel;
        }

        private string GetFirstLastText(int index) {
            if (index == firstIndex && index == lastIndex) {
                return "First & Last";
            } else if (index == firstIndex) {
                return "First";
            } else if (index == lastIndex) {
                return "Last";
            }
            return "";
        }

        private void PickButton_Click(object sender, EventArgs e) {
            var button = (Button)sender;
            int index = (int)button.Tag;

            if (firstIndex == -1) {
                // First pick - set both first and last
                firstIndex = index;
                lastIndex = index;
            } else if (lastIndex == -1) {
                // Second pick - set last
                lastIndex = index;
            } else {
                // Subsequent picks - determine which becomes first
                if (index < firstIndex) {
                    // New index is lower, so it becomes first
                    lastIndex = firstIndex;
                    firstIndex = index;
                } else {
                    // New index is higher, so it becomes last
                    lastIndex = index;
                }
            }

            RefreshWindowsList();
        }

        private void UntrackButton_Click(object sender, EventArgs e) {
            var button = (Button)sender;
            int index = (int)button.Tag;

            // Remove from tracked windows
            UntrackWindow(index);

            // Update first/last indices if needed
            if (index == firstIndex) {
                firstIndex = -1;
            }
            if (index == lastIndex) {
                lastIndex = -1;
            }

            RefreshWindowsList();
        }

        private List<Process> GetTrackedWindows() {
            var windows = Program.GetTrackedWindows();
            return windows.ToList();
        }

        private void UntrackWindow(int index) {
            Program.UntrackWindow(index);
        }

        private void LoadIcon() {
            try {
                this.Icon = new Icon(System.IO.Path.Combine(
                    System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location),
                    "app.ico"));
            } catch {
                // Use default icon if custom icon not found
            }
        }
    }
}