using System;
using System.Windows.Input;

namespace FastReport.Design
{
    public partial class WpfDesignerControl
    {
        /// <summary>
        /// Represents a designer command.
        /// </summary>
        public class DesignerCommand : ICommand
        {
            internal FastReport.Design.DesignerCommand InnerCommand { get; }
            private bool lastEnabledState;

            /// <inheritdoc/>
            public event EventHandler CanExecuteChanged;

            /// <inheritdoc/>
            public bool CanExecute(object parameter) => InnerCommand.Enabled;

            /// <inheritdoc/>
            public void Execute(object parameter) => InnerCommand.Invoke();

            private void Designer_UIStateChanged(object sender, EventArgs e)
            {
                bool newEnabledState = InnerCommand.Enabled;
                if (newEnabledState != lastEnabledState)
                {
                    lastEnabledState = newEnabledState;
                    CanExecuteChanged?.Invoke(this, EventArgs.Empty);
                }
            }

            internal DesignerCommand(WpfDesignerControl designer, Design.DesignerCommand innerCommand)
            {
                InnerCommand = innerCommand;
                designer.UIStateChanged += Designer_UIStateChanged;
            }
        }

        /// <summary>
        /// Represents a designer "Open" command.
        /// </summary>
        public class OpenCommand : DesignerCommand
        {
            /// <summary>
            /// Loads a specified report file.
            /// </summary>
            /// <param name="fileName">File to load.</param>
            /// <param name="silent">true to suppress message dialog if load is failed.</param>
            public void LoadFile(string fileName, bool silent = false) => (InnerCommand as Design.OpenCommand).LoadFile(fileName, silent);

            internal OpenCommand(WpfDesignerControl designer, Design.OpenCommand innerCommand) : base(designer, innerCommand) { }
        }

        /// <summary>
        /// Represents a designer "Recent Files" command.
        /// </summary>
        public class RecentFilesCommand : DesignerCommand
        {
            /// <summary>
            /// Returns true if the file specified is a cloud file.
            /// </summary>
            /// <param name="fileName">File name to check.</param>
            /// <returns>true if file is a cloud file.</returns>
            public bool IsCloudFile(string fileName) => (InnerCommand as Design.RecentFilesCommand).IsCloudFile(fileName);

            /// <summary>
            /// Opens a recent file with specified name either from local PC or from cloud.
            /// </summary>
            /// <param name="fileName">File name to open.</param>
            public void LoadFile(string fileName) => (InnerCommand as Design.RecentFilesCommand).LoadFile(fileName);

            internal RecentFilesCommand(WpfDesignerControl designer, Design.RecentFilesCommand innerCommand) : base(designer, innerCommand) { }
        }
    }
}