using System;
using System.ComponentModel;
using System.Linq;
using System.Windows.Forms;
using FastReport.Design;
using FastReport.Utils;

namespace FastReport.Controls
{
    internal class FRSideControl : Panel
    {
        private UIStyle style;
        private Designer designer;
        private Splitter splitter;
        private ControlStorageService storage;

        /// <summary>
        /// Gets storage service.
        /// </summary>
        public ControlStorageService Storage
        {
            get
            {
                if (storage == null)
                    storage = new ControlStorageService(this, "Designer," + Name);
                return storage;
            }
        }

        public FRTabControl TopPanel { get; }

        public FRTabControl BottomPanel { get; }

        public UIStyle Style
        {
            get => style;
            set
            {
                style = value;
                var table = UIStyleUtils.GetColorTable(value);
                TopPanel.Style = BottomPanel.Style = table.ToolWindow;
                splitter.BackColor = table.Workspace.SplitterBackColor;
            }
        }

        public FRSideControl OtherSideControl { get; set; }

        public bool IsEmpty => VisiblePanelCount == 0;

        public event EventHandler LayoutChanged;

        private int VisiblePanelCount => (TopPanel.Tabs.Count > 0 ? 1 : 0) + (BottomPanel.Tabs.Count > 0 ? 1 : 0);

        private string GetControls(FRTabControl panel) => string.Join(",", panel.Tabs.Cast<Control>().Select(c => c.Name));

        private void SetControls(FRTabControl panel, string controls)
        {
            panel.Tabs.Clear();
            foreach (var name in controls.Split(','))
            {
                var plugin = designer.Plugins.Find(name) as PageControlPage;
                if (plugin != null)
                {
                    plugin.Dock = DockStyle.Fill;
                    panel.Tabs.Add(plugin);
                }
            }
        }

        private void topPanelMenu_Opening(object sender, CancelEventArgs e)
        {
            TopPanel.Menu.Items.Clear();
            TopPanel.Menu.Font = this.Font;
            var selectedTab = TopPanel.SelectedTab;
            var selectedTabText = "\"" + selectedTab.Text + "\"";
            var res = new MyRes("Designer,ToolWindow");

            var menuDockToBottom = new ToolStripMenuItem(string.Format(res.Get("DockToBottom"), selectedTabText));
            menuDockToBottom.Click += (s, args) =>
            {
                AddToBottomPanel(selectedTab);
                RefreshLayout();
            };
            if (VisiblePanelCount > 1 || TopPanel.Tabs.Count > 1)
                TopPanel.Menu.Items.Add(menuDockToBottom);

            var menuDockToOtherSide = new ToolStripMenuItem(string.Format(res.Get("DockToOtherSide"), selectedTabText));
            menuDockToOtherSide.Click += (s, args) =>
            {
                OtherSideControl.AddToTopPanel(selectedTab);
                RefreshLayout();
                OtherSideControl.RefreshLayout();
            };
            TopPanel.Menu.Items.Add(menuDockToOtherSide);
        }

        private void bottomPanelMenu_Opening(object sender, CancelEventArgs e)
        {
            BottomPanel.Menu.Items.Clear();
            BottomPanel.Menu.Font = this.Font;
            var selectedTab = BottomPanel.SelectedTab;
            var selectedTabText = "\"" + selectedTab.Text + "\"";
            var res = new MyRes("Designer,ToolWindow");

            var menuDockToTop = new ToolStripMenuItem(string.Format(res.Get("DockToTop"), selectedTabText));
            menuDockToTop.Click += (s, args) =>
            {
                AddToTopPanel(selectedTab);
                RefreshLayout();
            };
            if (VisiblePanelCount > 1 || BottomPanel.Tabs.Count > 1)
                BottomPanel.Menu.Items.Add(menuDockToTop);

            var menuDockToOtherSide = new ToolStripMenuItem(string.Format(res.Get("DockToOtherSide"), selectedTabText));
            menuDockToOtherSide.Click += (s, args) =>
            {
                OtherSideControl.AddToBottomPanel(selectedTab);
                RefreshLayout();
                OtherSideControl.RefreshLayout();
            };
            BottomPanel.Menu.Items.Add(menuDockToOtherSide);
        }

        private void AddToPanel(FRTabControl panel, PageControlPage page)
        {
            page.Dock = DockStyle.Fill;
            panel.Tabs.Add(page);
            // workaround SWF behavior (page is added somewhere in the middle of the Controls list)
            page.SendToBack();
        }

        public void AddToTopPanel(PageControlPage page) => AddToPanel(TopPanel, page);

        public void AddToBottomPanel(PageControlPage page) => AddToPanel(BottomPanel, page);

        public void RefreshLayout()
        {
            bool splitterWasVisible = splitter.Visible;
            TopPanel.Visible = TopPanel.Tabs.Count > 0;
            BottomPanel.Visible = BottomPanel.Tabs.Count > 0;
            splitter.Visible = VisiblePanelCount == 2;
            TopPanel.Dock = BottomPanel.Tabs.Count > 0 ? DockStyle.Top : DockStyle.Fill;
            
            if (!splitterWasVisible && splitter.Visible)
                TopPanel.Height = Height / 2;

            TopPanel.Refresh();
            TopPanel.SelectedTabIndex = 0;
            BottomPanel.Refresh();
            BottomPanel.SelectedTabIndex = 0;

            LayoutChanged?.Invoke(this, EventArgs.Empty);
        }

        public void UpdateDpiDependencies()
        {
            TopPanel.UpdateDpiDependencies();
            BottomPanel.UpdateDpiDependencies();
            splitter.Height = this.LogicalToDevice(3);
        }

        public void UpdateText()
        {
            TopPanel.UpdateText();
            BottomPanel.UpdateText();
        }

        public void SaveState()
        {
            Storage.SetDip("Width", Width);
            Storage.SetDip("TopPanelHeight", Math.Min(TopPanel.Height, Height - 50));
            Storage.SetStr("TopPanelControls", GetControls(TopPanel));
            Storage.SetStr("BottomPanelControls", GetControls(BottomPanel));
        }

        public void RestoreState()
        {
            if (Storage.HasProperties)
            {
                Width = Storage.GetDip("Width", 280, 50, 1000);
                SetControls(TopPanel, Storage.GetStr("TopPanelControls"));
                SetControls(BottomPanel, Storage.GetStr("BottomPanelControls"));
                RefreshLayout();
                TopPanel.Height = Storage.GetDip("TopPanelHeight", 350);
            }
        }

        public FRSideControl(Designer designer)
        {
            this.designer = designer;
            Name = "SideControl";
            
            TopPanel = new FRTabControl();
            TopPanel.Dock = DockStyle.Top;
            TopPanel.CloseButtons = false;
            TopPanel.Menu = new ContextMenuStrip();
            TopPanel.Menu.Items.Add(new ToolStripMenuItem("dummy"));
            TopPanel.Menu.Opening += topPanelMenu_Opening;

            BottomPanel = new FRTabControl();
            BottomPanel.Dock = DockStyle.Fill;
            BottomPanel.CloseButtons = false;
            BottomPanel.Menu = new ContextMenuStrip();
            BottomPanel.Menu.Items.Add(new ToolStripMenuItem("dummy"));
            BottomPanel.Menu.Opening += bottomPanelMenu_Opening;
            
            splitter = new Splitter();
            splitter.Dock = DockStyle.Top;
            splitter.MinSize = 0;
            splitter.MinExtra = 0;
            
            Controls.AddRange(new Control[] { BottomPanel, splitter, TopPanel });
        }
    }
}