using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using MUDEngine.Objects.Environment;
using MUDEngine.Objects;
using MUDEngine;
using MUDEngine.FileSystem;

namespace RoomDesigner
{
    public partial class frmMain : Form
    {
        //Current _CurrentRoom
        Room _CurrentRoom;

        //Doorway currently loaded.
        Door _CurrentDoor;

        public frmMain()
        {
            InitializeComponent();

            //Initialize the Room & Doorway
            _CurrentRoom = new Room();
            _CurrentDoor = new Door(AvailableTravelDirections.None);

            //Show the user(s) the rooms properties
            propertyRoom.SelectedObject = _CurrentRoom;

            //This instances a copy of AvailableTravelDirections which is a list of
            //currently available directions users can travel within rooms.
            //Instead of updating the editor each time a new travel direction is implemented,
            //we simply build an array that contains each travel direction currently available
            //within the engine by getting each element from the AvailableTravelDirections enum
            AvailableTravelDirections type = new AvailableTravelDirections();

            //Build an array of travel directions currently implemented
            Array Values = System.Enum.GetValues(type.GetType());

            //Loop through each travel direction within the array and add it
            //to the lstDirections listbox.
            foreach (int Value in Values)
            {
                string Display = Enum.GetName(type.GetType(), Value);
                //The array contains a 'None' direction. As the editor will allow for
                //installing and uninstalling doorways, we don't need to show a 'None' direction
                //in the listbox.
                if (!Display.Equals("None"))
                    this.lstDirections.Items.Add(Display);
            }
        }

        /// <summary>
        /// Closes the editor.
        /// TODO: Serialize the Room out to file.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnCloseEditor_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        /// <summary>
        /// Change the currently selected direction, allowing users to uninstall or install
        /// a doorway, and display the selected doorways properties for editing.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void lstDirections_SelectedIndexChanged(object sender, EventArgs e)
        {
            //Used to indicate that the direction the user selected exists,
            //and was found for editing
            bool IsFound = false;

            //Loop through each doorway installed within the _CurrentRoom and see if the user has
            //selected a direction that belongs to a _CurrentDoor already created. If a _CurrentDoor with 
            //the selected direction is found, we display it's properties for editing instead
            //of creating a new _CurrentDoor and overwriting the previously created doorway.
            foreach (Door newDoor in _CurrentRoom.InstalledDoors)
            {
                //Check if the current _CurrentDoor in the loop matches the currently selected
                //travel direction the user has selected in the listbox.
                if (newDoor.TravelDirection.ToString() == lstDirections.SelectedItem.ToString())
                {
                    //The travel directions match, let's set the current _CurrentDoor in the loop as our
                    //new selected doorway so that the user can edit it. 
                    _CurrentDoor = newDoor;

                    //Indicates that we found a matching doorway and have set it up for
                    //editing within the propertygrid
                    IsFound = true;

                    //Exit the loop
                    break;
                }
            }

            //There isn't a _CurrentDoor installed into the _CurrentRoom yet with a travel direction
            //matching that of the users currently selected travel direction within the listbox.
            //so we instance a new _CurrentDoor
            if (!IsFound)
            {
                AvailableTravelDirections direction = GetDirection(lstDirections.SelectedItem.ToString());
                _CurrentDoor = new Door(direction);
            }
            //Display the properties for users to edit. This could be a pre-existing doorway
            //found within our loop, or a new doorway.
            propertyDoor.SelectedObject = _CurrentDoor;
        }

        /// <summary>
        /// Modified values within the doorway get stored within the currentDoor Field.
        /// </summary>
        /// <param name="s"></param>
        /// <param name="e"></param>
        private void propertyDoor_PropertyValueChanged(object s, PropertyValueChangedEventArgs e)
        {
            //Check if we are installing the door into the room or
            //uninstalling it from the current room.
            switch (_CurrentDoor.DoorState)
            {
                case Door.AvailableDoorStates.Installed:
                    InstallDoor();
                    break;
                case Door.AvailableDoorStates.Uninstalled:
                    UninstallDoor();
                    break;
            }
        }

        private AvailableTravelDirections GetDirection(string Direction)
        {
            foreach (AvailableTravelDirections value in Enum.GetValues(typeof(AvailableTravelDirections)))
            {
                string name = value.ToString();

                if (name == Direction)
                    return value;
            }

            return AvailableTravelDirections.None;
        }

        /// <summary>
        /// Installs the _CurrentDoor into the _CurrentRoom's collection of doorways
        /// </summary>
        private void InstallDoor()
        {
            //Indicates if we found a door already installed within the room
            //matching the selected travel direction.
            bool IsInstalled = false;

            //Incase there are no existing doors, the foreach loop gets skipped.
            if (_CurrentRoom.InstalledDoors.Count == 0)
            {
                //Add the new door to the room
                _CurrentRoom.InstalledDoors.Add(_CurrentDoor);
                return;
            }

            //Loop through all of the installed doors within this room and
            //check to see if we have a doorway with the same travel direction
            //that the user has selected within the list box. If so then we
            //need to prompt the user to ensure it's ok to overwrite the previous
            //door with a new door.
            //TODO: Look at this closer, do i need this messagebox?
            foreach (Door newDoor in _CurrentRoom.InstalledDoors)
            {
                if (newDoor.TravelDirection == _CurrentDoor.TravelDirection)
                {
                    /*DialogResult result = MessageBox.Show("Door already exists! Overwrite it?", "Room Designer", MessageBoxButtons.YesNo);
                    if (result == DialogResult.No)
                        return;
                    */
                    _CurrentRoom.InstalledDoors.Remove(newDoor);
                    _CurrentRoom.InstalledDoors.Add(_CurrentDoor);
                    IsInstalled = true;
                    break;
                }
            }

            if (!IsInstalled)
                _CurrentRoom.InstalledDoors.Add(_CurrentDoor);
        }

        private void UninstallDoor()
        {
            foreach (Door door in _CurrentRoom.InstalledDoors)
            {
                if (door.TravelDirection == _CurrentDoor.TravelDirection)
                {
                    _CurrentRoom.InstalledDoors.Remove(door);
                    break;
                }
            }
        }
    }
}