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

namespace FastReport.Design.ToolWindows
{
    /// <summary>
    /// Base class for all tool windows such as "Properties", "Data Dictionary" etc.
    /// </summary>
    /// <remarks>
    /// <para>Use this class to create own tool window. To do this:</para>
    /// <para>- in the constructor, set the <b>Name</b> and <b>Image</b> properties and create necessary controls. 
    /// The <b>Name</b> will be used to restore window's state;</para>
    /// <para>- override the <b>SelectionChanged</b> method. This method is called when current selection
    /// is changed. In this method, you should update buttons state to reflect the current selection. 
    /// Selected objects can be accessed via <b>Designer.SelectedObjects</b> property;</para>
    /// <para>- override the <b>UpdateContent</b> method. This method is called when the report
    /// content was changed. Typically you need to do the same actions in <b>SelectionChanged</b> and
    /// <b>UpdateContent</b> methods;</para>
    /// <para>- to register a toolwindow, add its type to the <see cref="DesignerPlugins"/> global collection:
    /// <code>
    /// DesignerPlugins.Add(typeof(MyToolWindow));
    /// </code>
    /// </para>
    /// </remarks>
    public class ToolWindowBase : PageControlPage, IDesignerPlugin
    {
        #region Properties
        /// <summary>
        /// Gets the report designer.
        /// </summary>
        public Designer Designer { get; }

        /// <summary>
        /// Gets a value indicating that window is locked.
        /// </summary>
        public bool Locked { get; private set; }

        /// <inheritdoc/>
        public string PluginName => Name;

        private ControlStorageService storage;

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

        #endregion

        #region Public Methods
        internal ToolbarButton AddButton(int imageIndex, EventHandler click) => AddButton(imageIndex, false, click);

        internal ToolbarButton AddButton(int imageIndex, bool imageAndText, EventHandler click)
        {
            var btn = new ToolbarButton("", imageIndex, click);
            btn.Image = this.GetImage(imageIndex);
            btn.ImageIndex = imageIndex;
            if (imageAndText)
                btn.DisplayStyle = ToolStripItemDisplayStyle.ImageAndText;
            return btn;
        }

        internal ContextMenuItem AddMenuItem(int imageIndex, EventHandler click)
        {
            var mi = new ContextMenuItem();
#if !(WPF || AVALONIA)
            // Mono: setting ImageIndex does not work in Mono/Linux; Mono/Win displays strange artifacts
            mi.Image = this.GetImage(imageIndex);
#else
            // WPF: works well, also updates on dpi change
            mi.ImageIndex = imageIndex;
#endif
            mi.Click += click;
            return mi;
        }

        internal ContextMenuItem AddMenuItem(EventHandler click)
        {
            return AddMenuItem(-1, click);
        }

        #endregion

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

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

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

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

        /// <inheritdoc/>
        public virtual void Lock()
        {
            Locked = true;
        }

        /// <inheritdoc/>
        public virtual void Unlock()
        {
            Locked = false;
            UpdateContent();
        }

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

        /// <summary>
        /// Implements <see cref="IDesignerPlugin.GetOptionsPage"/> method.
        /// </summary>
        /// <returns>The options page, if implemented; otherwise, <b>null</b>.</returns>
        public virtual DesignerOptionsPage GetOptionsPage()
        {
            return null;
        }

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

        /// <inheritdoc/>
        public virtual void UpdateDpiDependencies()
        {
        }
        #endregion

        /// <summary>
        /// Initializes a new instance of the <see cref="ToolWindowBase"/> class with default settings.
        /// </summary>
        /// <param name="designer">The report designer.</param>
        /// <remarks>
        /// You don't need to call this constructor. The designer will do this automatically.
        /// </remarks>
        public ToolWindowBase(Designer designer) : base()
        {
            Designer = designer;
        }
    }
}