using System;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace MetaAssets
{
    public static class ContentLoader
    {
        public static T? loadFile<T>(string dataDir, string fileName) where T : ContentTableBase<T>
        {
            try
            {
                string exactPath = Path.GetFullPath(dataDir);

                string data = System.IO.File.ReadAllText(Path.Combine(dataDir, fileName));
                return Newtonsoft.Json.JsonConvert.DeserializeObject<T>(data);
            }
            catch (Exception ex)
            {
                throw new Exception($"content load fail. dataDir: {dataDir}, fileName: {fileName}", ex);
            }
        }

        public static T? loadMultipleFiles<T>(string dataDir, string filePattern) where T : ContentTableBase<T>
        {
            var files = Directory.GetFiles(dataDir, filePattern, SearchOption.TopDirectoryOnly);

            List<T> tables = new List<T>();
            foreach (string file in files)
            {
                string data = System.IO.File.ReadAllText(file);
                T? json = Newtonsoft.Json.JsonConvert.DeserializeObject<T>(data);

                if(json != null)
                    tables.Add(json);
            }

            T? oneTable = null;
            foreach (var table in tables)
            {
                if (oneTable == null)
                    oneTable = table;
                else
                    oneTable.merge(table);
            }

            return oneTable;
        }
    }
}