using FastReport.Forms;
using FastReport.Utils;
using System.Collections;
using System.Windows;
using System.Windows.Forms;

namespace FastReport.Design.RibbonDesigner
{
    internal enum GroupState
    {
        Normal,
        Reduced,
        Collapsed
    }

    internal enum GroupPriority
    {
        Low,
        Medium,
        High
    }

    internal class RibbonGroup : GridPanel, IDesignerPlugin
    {
        private Hashtable cachedWidths = new Hashtable();

        public Designer Designer { get; }

        public StackedPanel Panel { get; }

        public Label Caption { get; }

        private GroupState state;
        public GroupState State
        {
            get => state;
            set
            {
                state = value;
                UpdateState();
                control.UpdateLayout();
            }
        }

        public double GroupWidth
        {
            get
            {
                if (!cachedWidths.ContainsKey(state))
                    cachedWidths[state] = this.Measure();
                return (double)cachedWidths[state];
            }
        }

        public ToolbarLayoutDropDownButton CollapsedButton { get; }

        public string CollapsedImageName { get; set; }

        public GroupPriority Priority { get; set; }

        private ControlStorageService storage;

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

        public override string Text 
        { 
            get => base.Text;
            set
            {
                base.Text = value;
                Caption.Text = value;
                CollapsedButton.Text = value;
            }
        }

        public override bool Visible 
        { 
            get => base.Visible;
            set
            {
                if (value != Visible)
                {
                    base.Visible = value;
                    control.Visibility = value ? Visibility.Visible : Visibility.Collapsed;
                    cachedWidths.Clear();
                    control.UpdateLayout();
                    (Parent as Ribbon).UpdateLayout();
                }
            }
        }

        #region IDesignerPlugin
        public string PluginName => Name;

        /// <inheritdoc/>
        public virtual void SaveState()
        {
        }

        /// <inheritdoc/>
        public virtual void RestoreState()
        {
        }

        /// <inheritdoc/>
        public virtual void SelectionChanged()
        {
        }

        /// <inheritdoc/>
        public virtual void UpdateContent()
        {
        }

        /// <inheritdoc/>
        public void Lock()
        {
        }

        /// <inheritdoc/>
        public void Unlock()
        {
            UpdateContent();
        }

        /// <inheritdoc/>
        public virtual void Localize()
        {
            cachedWidths.Clear();
        }

        /// <inheritdoc/>
        public virtual DesignerOptionsPage GetOptionsPage()
        {
            return null;
        }

        /// <inheritdoc/>
        public virtual void UpdateUIStyle()
        {
            Panel.UpdateUIStyle(Designer.UIStyle);
            CollapsedButton.UpdateUIStyle(Designer.UIStyle);
        }

        /// <inheritdoc/>
        public virtual void UpdateDpiDependencies()
        {
            RibbonExtensions.UpdateDpiDependencies(this);
            Panel.UpdateDpiDependencies();
            if (!string.IsNullOrEmpty(CollapsedImageName))
                CollapsedButton.Image = Designer.GetImage(CollapsedImageName);
        }
        #endregion

        public virtual void UpdateState()
        {
            if (State == GroupState.Collapsed)
            {
                Panel.CollapseTo(CollapsedButton);
            }
            else
            {
                CollapsedButton.ExpandTo(Panel);
            }
        }

        public void SetItemText(ToolStripItem item, string text)
        {
            if (text.EndsWith("..."))
                text = text.Substring(0, text.Length - 3);
            item.ToolTipText = text;
            item.Text = text;
        }

        public RibbonGroup(Designer designer)
        { 
            Designer = designer;
            state = GroupState.Normal;

            control.Margin = new Thickness(4, 1, 4, 1);

            Caption = new RibbonGroupCaption();
            this.Controls.Add(Caption);

            Panel = new StackedPanel() { Vertical = false };
            Panel.control.Margin = new Thickness(0, 3, 0, 16);
            this.Controls.Add(Panel);

            CollapsedButton = new ToolbarLayoutDropDownButton();
            CollapsedButton.MakeBig();
            CollapsedButton.DropDownOpening += (s, e) => UpdateDpiDependencies();
        }
    }
}