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 FlowLayoutPanel windowsPanel;

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

        private void InitializeComponent() {
            this.windowsPanel = new System.Windows.Forms.FlowLayoutPanel();
            this.SuspendLayout();
            //
            // windowsPanel
            //
            this.windowsPanel.AutoScroll = true;
            this.windowsPanel.BackColor = System.Drawing.Color.White;
            this.windowsPanel.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
            this.windowsPanel.Location = new System.Drawing.Point(12, 12);
            this.windowsPanel.Name = "windowsPanel";
            this.windowsPanel.Padding = new System.Windows.Forms.Padding(10);
            this.windowsPanel.Size = new System.Drawing.Size(576, 396);
            this.windowsPanel.TabIndex = 1;
            //
            // SettingsForm
            //
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(600, 420);
            this.Controls.Add(this.windowsPanel);
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
            this.MaximizeBox = false;
            this.MinimizeBox = false;
            this.Name = "SettingsForm";
            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
            this.Text = "DD2Switcher Settings";
            this.ResumeLayout(false);
        }

        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 windowPanelForm = new WindowPanelForm();
                windowPanelForm.WindowIndex = i;
                windowPanelForm.WindowProcess = window;
                windowPanelForm.IsFirst = (i == Program.FirstIndex);
                windowPanelForm.IsLast = (i == Program.LastIndex);
                windowPanelForm.UpdateDisplay();

                windowPanelForm.PickClicked += (sender, index) => {
                    if (Program.FirstIndex == -1) {
                        // First pick - set both first and last
                        Program.FirstIndex = index;
                        Program.LastIndex = index;
                    } else if (Program.LastIndex == -1) {
                        // Second pick - set last (must be >= first)
                        if (index >= Program.FirstIndex) {
                            Program.LastIndex = index;
                        } else {
                            Program.LastIndex = Program.FirstIndex;
                            Program.FirstIndex = index;
                        }
                    } else {
                        // Subsequent picks - determine which becomes first
                        int distanceToFirst = Math.Abs(index - Program.FirstIndex);
                        int distanceToLast = Math.Abs(index - Program.LastIndex);

                        if (distanceToFirst <= distanceToLast) {
                            // New index is closer to first, so first moves
                            if (index <= Program.LastIndex) {
                                Program.FirstIndex = index;
                            } else {
                                Program.LastIndex = Program.FirstIndex;
                                Program.FirstIndex = index;
                            }
                        } else {
                            // New index is closer to last, so last moves
                            if (index >= Program.FirstIndex) {
                                Program.LastIndex = index;
                            } else {
                                Program.FirstIndex = Program.LastIndex;
                                Program.LastIndex = index;
                            }
                        }
                    }

                    // Ensure last >= first
                    if (Program.LastIndex < Program.FirstIndex) {
                        int tmp = Program.LastIndex;
                        Program.LastIndex = Program.FirstIndex;
                        Program.FirstIndex = tmp;
                    }

                    RefreshWindowsList();
                };
                windowPanelForm.UntrackClicked += (sender, index) => {
                    UntrackWindow(index);
                    RefreshWindowsList();
                };

                windowsPanel.Controls.Add(windowPanelForm);
            }
        }

        private string GetFirstLastText(int index) {
            if (index == Program.FirstIndex && index == Program.LastIndex) {
                return "First & Last";
            } else if (index == Program.FirstIndex) {
                return "First";
            } else if (index == Program.LastIndex) {
                return "Last";
            }
            return "";
        }

        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
            }
        }
    }
}