using System;
using System.IO;
using System.Runtime.CompilerServices;
using BansheeEngine;

namespace BansheeEditor
{
    public sealed class ProjectLibrary : ScriptObject
    {
        public static DirectoryEntry Root { get { return Internal_GetRoot(); } }

        public static event Action<string> OnEntryAdded;
        public static event Action<string> OnEntryRemoved;

        public static void Create(Resource resource, string path)
        {
            if (Path.IsPathRooted(path))
                throw new ArgumentException("Provided path must be relative.", "path");

            Internal_Create(resource, path);
        }

        public static void Save(Resource resource)
        {
            Internal_Save(resource);
        }

        public static T Load<T>(string path) where T : Resource
        {
            if (Path.IsPathRooted(path))
                throw new ArgumentException("Provided path must be relative.", "path");

            return (T) Internal_Load(path);
        }

        public static void Reimport(string path, ImportOptions options = null, bool force = false)
        {
            Internal_Reimport(path, options, force);
        }

        public static bool Exists(string path)
        {
            return GetEntry(path) != null;
        }

        public static LibraryEntry GetEntry(string path)
        {
            return Internal_GetEntry(path);
        }

        public static LibraryEntry[] Search(string pattern, ResourceType[] types = null)
        {
            return Internal_Search(pattern, types);
        }

        public static string GetPath(Resource resource)
        {
            return Internal_GetPath(resource);
        }

        public static void Delete(string path)
        {
            Internal_Delete(path);
        }

        public static void CreateFolder(string path)
        {
            Internal_CreateFolder(path);
        }

        public static void Rename(string path, string name)
        {
            Internal_Rename(path, name);
        }

        public static void Move(string oldPath, string newPath, bool overwrite = false)
        {
            Internal_Move(oldPath, newPath, overwrite);
        }

        public static void Copy(string source, string destination, bool overwrite = false)
        {
            Internal_Copy(source, destination, overwrite);
        }

        private static void Internal_DoOnEntryAdded(string path)
        {
            if (OnEntryAdded != null)
                OnEntryAdded(path);
        }

        private static void Internal_DoOnEntryRemoved(string path)
        {
            if (OnEntryRemoved != null)
                OnEntryRemoved(path);
        }

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern void Internal_Create(Resource resource, string path);

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern Resource Internal_Load(string path);

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern void Internal_Save(Resource resource);

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern DirectoryEntry Internal_GetRoot();

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern void Internal_Reimport(string path, ImportOptions options, bool force);

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern LibraryEntry Internal_GetEntry(string path);

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern LibraryEntry[] Internal_Search(string path, ResourceType[] types);

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern string Internal_GetPath(Resource resource);

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern void Internal_Delete(string path);

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern void Internal_CreateFolder(string path);

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern void Internal_Rename(string path, string name);

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern void Internal_Move(string oldPath, string newPath, bool overwrite);

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern void Internal_Copy(string source, string destination, bool overwrite);
    }

    // Note: Must be the same as C++ enum ProjectLibrary::LibraryEntryType
    public enum LibraryEntryType
    {
        File, Directory
    }

    // Note: Must be the same as C++ enum ScriptResourceType
    public enum ResourceType
    {
        Texture, SpriteTexture, Mesh, Font, GpuProgram, PlainText, ScriptCode, Undefined
    }

    public class LibraryEntry : ScriptObject
    {
        public string Path { get { return Internal_GetPath(mCachedPtr); } }
        public string Name { get { return Internal_GetName(mCachedPtr); } }

        public LibraryEntryType Type { get { return Internal_GetType(mCachedPtr); } }
        public DirectoryEntry Parent { get { return Internal_GetParent(mCachedPtr); } }

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern string Internal_GetPath(IntPtr thisPtr);

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern string Internal_GetName(IntPtr thisPtr);

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern LibraryEntryType Internal_GetType(IntPtr thisPtr);

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern DirectoryEntry Internal_GetParent(IntPtr thisPtr);
    }

    public class DirectoryEntry : LibraryEntry
    {
        public LibraryEntry[] Children { get { return Internal_GetChildren(mCachedPtr); } }

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern LibraryEntry[] Internal_GetChildren(IntPtr thisPtr);
    }

    public class FileEntry : LibraryEntry
    {
        public ImportOptions Options { get { return Internal_GetImportOptions(mCachedPtr); } }
        public string UUID { get { return Internal_GetUUID(mCachedPtr); } }
        public Texture2D Icon { get { return Internal_GetIcon(mCachedPtr); } }
        public ResourceType ResType { get { return Internal_GetResourceType(mCachedPtr); } }

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern ImportOptions Internal_GetImportOptions(IntPtr thisPtr);

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern string Internal_GetUUID(IntPtr thisPtr);

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern Texture2D Internal_GetIcon(IntPtr thisPtr);

        [MethodImpl(MethodImplOptions.InternalCall)]
        private static extern ResourceType Internal_GetResourceType(IntPtr thisPtr);
    }
}