using FastReport.Utils;
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace FastReport.Controls
{
    internal class FRTabControl : UserControl
    {
        private FRTabStrip tabStrip;
        private PageControl pageControl;
        private Panel captionPanel;
        private bool showTabs;
        private bool closeButtons;
        private ToolWindowColors style = new ToolWindowColors();

        public event EventHandler SelectedTabChanged;
        public event EventHandler TabClosed;
        public event TabMovedEventHandler TabMoved;

        public TabOrientation TabOrientation
        {
            get { return tabStrip.TabOrientation; }
            set
            {
                tabStrip.TabOrientation = value;
                if (value == TabOrientation.Top)
                {
                    tabStrip.Dock = DockStyle.Top;
                }
                else if (value == TabOrientation.Bottom)
                {
                    tabStrip.Dock = DockStyle.Bottom;
                }
            }
        }

        public ControlCollection Tabs
        {
            get { return pageControl == null ? null : pageControl.Pages; }
        }

        public bool ShowCaption
        {
            get { return captionPanel.Visible; }
            set { captionPanel.Visible = value && TabOrientation == TabOrientation.Bottom; }
        }

        public bool ShowTabs
        {
            get { return showTabs; }
            set
            {
                showTabs = value;
                UpdateTabStripVisible();
            }
        }

        public bool CloseButtons
        {
            get { return closeButtons; }
            set { closeButtons = value; }
        }

        public ToolWindowColors Style
        {
            get => style;
            set
            {
                style = value;
                tabStrip.Style = value.TabStrip;
                captionPanel.Refresh();
            }
        }

        public ContextMenuStrip Menu { get; set; }

        public PageControlPage SelectedTab
        {
            get { return pageControl.ActivePage as PageControlPage; }
            set { SelectedTabIndex = GetTabIndex(value); }
        }

        public int SelectedTabIndex
        {
            get { return tabStrip.SelectedTabIndex; }
            set { tabStrip.SelectedTabIndex = value; }
        }

        private int GetTabIndex(PageControlPage page)
        {
            for (int i = 0; i < tabStrip.Tabs.Count; i++)
            {
                if (tabStrip.Tabs[i].Tag == page)
                    return i;
            }
            return -1;
        }

        private void UpdateTabStripVisible()
        {
            if (tabStrip != null)
                tabStrip.Visible = showTabs && tabStrip.Tabs.Count > 1;
        }

        private void pageControl_ControlAdded(object sender, ControlEventArgs e)
        {
            PageControlPage page = e.Control as PageControlPage;
            Tab tab = new Tab(page.Text, page.Image);
            tab.Tag = page;
            tab.CloseButton = closeButtons;
            tabStrip.Tabs.Add(tab);
            UpdateTabStripVisible();
        }

        private void pageControl_ControlRemoved(object sender, ControlEventArgs e)
        {
            PageControlPage page = e.Control as PageControlPage;
            int tabIndex = GetTabIndex(page);
            if (tabIndex != -1)
            {
                tabStrip.Tabs.RemoveAt(tabIndex);
                SelectedTabIndex = SelectedTabIndex;
                UpdateTabStripVisible();
            }
        }

        private void tabStrip_TabChanged(object sender, EventArgs e)
        {
            int idx = tabStrip.SelectedTabIndex;
            if (idx >= 0)
            {
                pageControl.ActivePage = tabStrip.SelectedTab.Tag as PageControlPage;
                // update the title
                captionPanel.Refresh();
            }

            if (SelectedTabChanged != null)
                SelectedTabChanged(this, e);
        }

        private void tabStrip_TabClosed(object sender, EventArgs e)
        {
            if (TabClosed != null)
                TabClosed((sender as Tab).Tag as PageControlPage, e);
        }

        private void tabStrip_TabMoved(object sender, TabMovedEventArgs e)
        {
            if (TabMoved != null)
                TabMoved(this, e);
        }

        public void UpdateDpiDependencies()
        {
            captionPanel.Height = this.LogicalToDevice(24);
            tabStrip.Height = this.LogicalToDevice(25);
            foreach (Tab tab in tabStrip.Tabs)
            {
                if (tab.Tag is PageControlPage pg)
                    tab.Image = pg.Image;
            }
        }

        public void UpdateText()
        {
            foreach (Tab tab in tabStrip.Tabs)
            {
                if (tab.Tag is PageControlPage pg)
                    tab.Text = pg.Text;
            }
            tabStrip.Refresh();
            captionPanel.Refresh();
        }

        public FRTabControl()
        {
            captionPanel = new CaptionPanel(this);
            captionPanel.Dock = DockStyle.Top;
            captionPanel.BackColor = Color.FromArgb(204, 199, 186);

            tabStrip = new FRTabStrip();
            tabStrip.Dock = DockStyle.Bottom;
            tabStrip.TabOrientation = TabOrientation.Bottom;
            tabStrip.AllowTabReorder = false;
            tabStrip.Visible = false;
            tabStrip.SelectedTabChanged += tabStrip_TabChanged;
            tabStrip.TabClosed += tabStrip_TabClosed;
            tabStrip.TabMoved += tabStrip_TabMoved;

            pageControl = new PageControl();
            pageControl.Dock = DockStyle.Fill;
            pageControl.ControlAdded += pageControl_ControlAdded;
            pageControl.ControlRemoved += pageControl_ControlRemoved;

            Controls.Add(pageControl);
            Controls.Add(tabStrip);
            Controls.Add(captionPanel);

            TabOrientation = TabOrientation.Bottom;
            ShowCaption = true;
            ShowTabs = true;
            CloseButtons = true;

            UpdateDpiDependencies();
        }

        private class CaptionPanel : Panel
        {
            private FRTabControl owner;
            private bool hlMenuButton;

            protected override void OnPaint(PaintEventArgs e)
            {
                base.OnPaint(e);
                
                var rtl = RightToLeft == RightToLeft.Yes;
                var g = e.Graphics;
                var rect = new Rectangle(0, 0, Width, Height);
                using (var brush = new LinearGradientBrush(rect, owner.Style.Caption.GradientBegin, owner.Style.Caption.GradientEnd, LinearGradientMode.Vertical))
                {
                    g.FillRectangle(brush, rect);
                }

                rect.Inflate(this.LogicalToDevice(-4), 0);
                if (owner.ShowCaption && owner.tabStrip != null && owner.tabStrip.SelectedTab != null)
                    TextRenderer.DrawText(g, owner.tabStrip.SelectedTab.Text, Font, rect, owner.Style.Caption.ForeColor, TextFormatFlags.VerticalCenter | (rtl ? TextFormatFlags.Right : TextFormatFlags.Left));

                if (owner.Menu != null)
                {
                    int _2 = this.LogicalToDevice(2);
                    int _16 = this.LogicalToDevice(16);
                    int _19 = this.LogicalToDevice(19);
                    rect = new Rectangle(rtl ? _2 : Width - _19, (Height - _16) / 2, _16, _16);
                    if (hlMenuButton)
                    {
                        using (var brush = new SolidBrush(owner.Style.Caption.HighlightButton))
                        {
                            g.FillRectangle(brush, rect);
                        }
                    }
                    // ownerdrawn down arrow: may be useful for contrast themes
                    /*using (var pen = new Pen(owner.Style.Caption.ForeColor, this.LogicalToDevice(1f)))
                    {
                        int _4 = this.LogicalToDevice(4);
                        int _8 = this.LogicalToDevice(8);
                        int x = rect.Left + _4;
                        int y = rect.Top + rect.Height / 2 - _2;
                        g.SmoothingMode = SmoothingMode.HighQuality;
                        g.DrawLines(pen, new Point[]
                        {
                            new Point(x, y),
                            new Point(x + _4, y + _4),
                            new Point(x + _8, y)
                        });
                    }*/

                    g.DrawImage(this.GetImage(182), rect);
                }
            }

            protected override void OnMouseMove(MouseEventArgs e)
            {
                base.OnMouseMove(e);
                var rtl = RightToLeft == RightToLeft.Yes;
                hlMenuButton = rtl ? e.X < Height : e.X > Width - Height;
                if (owner.Menu != null)
                    Refresh();
            }

            protected override void OnMouseUp(MouseEventArgs e)
            {
                base.OnMouseUp(e);
                if (e.Button == MouseButtons.Left && hlMenuButton && owner.Menu != null)
                {
                    var rtl = RightToLeft == RightToLeft.Yes;
                    int _19 = this.LogicalToDevice(19);
                    hlMenuButton = false;
                    Refresh();
                    owner.Menu.Show(this, rtl ? _19 : Width - _19, Height);
                }
            }

            protected override void OnMouseLeave(EventArgs e)
            {
                base.OnMouseLeave(e);
                hlMenuButton = false;
                if (owner.Menu != null)
                    Refresh();
            }

            public CaptionPanel(FRTabControl owner)
            {
                this.owner = owner;
                SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.OptimizedDoubleBuffer, true);
            }
        }
    }
}