/*
 * MIT License
 *
 * Copyright (c) 2018 Clark Yang
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of 
 * this software and associated documentation files (the "Software"), to deal in 
 * the Software without restriction, including without limitation the rights to 
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies 
 * of the Software, and to permit persons to whom the Software is furnished to do so, 
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all 
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 
 * SOFTWARE.
 */

using Loxodon.Log;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Threading.Tasks;
using UnityEngine;

namespace Loxodon.Framework.Localizations
{
    public class DefaultCsvDataProvider : IDataProvider
    {
        private static readonly ILog log = LogManager.GetLogger(typeof(DefaultCsvDataProvider));

        private string root;
        private IDocumentParser parser;

        public DefaultCsvDataProvider(string root) : this(root, new CsvDocumentParser())
        {
        }

        public DefaultCsvDataProvider(string root, IDocumentParser parser)
        {
            if (string.IsNullOrEmpty(root))
                throw new ArgumentNullException("root");

            if (parser == null)
                throw new ArgumentNullException("parser");

            this.root = root;
            this.parser = parser;
        }

        public Task<Dictionary<string, object>> Load(CultureInfo cultureInfo)
        {
            try
            {
                Dictionary<string, object> dict = new Dictionary<string, object>();
                TextAsset[] texts = Resources.LoadAll<TextAsset>(this.root);
                FillData(dict, texts, cultureInfo);
                return Task.FromResult(dict);
            }
            catch (Exception e)
            {
                return Task.FromException<Dictionary<string, object>>(e);
            }
        }
        private void FillData(Dictionary<string, object> dict, TextAsset[] texts, CultureInfo cultureInfo)
        {
            try
            {
                if (texts == null || texts.Length <= 0)
                    return;

                foreach (TextAsset text in texts)
                {
                    try
                    {
                        using (MemoryStream stream = new MemoryStream(text.bytes))
                        {
                            var data = parser.Parse(stream, cultureInfo);
                            foreach (KeyValuePair<string, object> kv in data)
                            {
                                dict[kv.Key] = kv.Value;
                            }
                        }
                    }
                    catch (Exception e)
                    {
                        if (log.IsWarnEnabled)
                            log.WarnFormat("An error occurred when loading localized data from \"{0}\".Error:{1}", text.name, e);
                    }
                }
            }
            catch (Exception) { }
        }
    }
}