using ExcelDataReader;
using FirstVillain.ClassBuild;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;

namespace FirstVillain.Converter
{
    [Serializable]
    public class Wrapper<T>
    {
        public List<T> list;
    }
    public static class JsonConverter
    {
        private static Dictionary<string, int> _columnIdxDict;
        private static Dictionary<int, Type> _columnTypeDict;
        private static Dictionary<string, Type> _typeMap;
        public static void ExcelToJsonAndClass(string excelPath, string jsonPath, string entityPath)
        {
            string[] allFiles = Directory.GetFiles(excelPath);

            foreach (var excel in allFiles)
            {
                if (Path.GetExtension(excel) != ".xlsx")
                {
                    continue;
                }

                using (var stream = File.Open(excel, FileMode.Open, FileAccess.Read, FileShare.Read))
                {
                    using (var reader = ExcelReaderFactory.CreateReader(stream))
                    {
                        var excelData = reader.AsDataSet();

                        for (int i = 0; i < excelData.Tables.Count; i++)
                        {
                            if (excelData.Tables[i].TableName.StartsWith("#"))
                            {
                                continue;
                            }

                            string jsonName = "J" + excelData.Tables[i].TableName;
                            string outPath = Path.Combine(jsonPath, jsonName + ".json");
                                                       
                            if (File.Exists(outPath))
                            {
                                File.Delete(outPath);
                            }

                            var classBuilder = new ClassBuilder(jsonName + "Data");

                            var jsonBase = new JObject();
                            var jsonArray = new JArray();

                            SetCoumnData(excelData.Tables[i].Rows[0], excelData.Tables[i].Rows[1]);
                            int columnCount = _columnIdxDict.Count;

                            for (int j = 2; j < excelData.Tables[i].Rows.Count; j++)
                            {
                                var json = new JObject();

                                foreach (var nameData in _columnIdxDict)
                                {
                                    var data = excelData.Tables[i].Rows[j][nameData.Value];                                    

                                    if (_columnTypeDict[nameData.Value] == typeof(string))
                                    {
                                        json.Add(nameData.Key, data.ToString());
                                    }
                                    else if (_columnTypeDict[nameData.Value] == typeof(int))
                                    {
                                        if (int.TryParse(data.ToString(), out int result))
                                        {
                                            json.Add(nameData.Key, result);
                                        }
                                    }
                                    else if (_columnTypeDict[nameData.Value] == typeof(float))
                                    {
                                        if (float.TryParse(data.ToString(), out float result))
                                        {
                                            json.Add(nameData.Key, result);
                                        }
                                    }
                                    else
                                    {
                                        throw new Exception("Not supporting type of column");
                                    }
                                }

                                jsonArray.Add(json);
                            }

                            jsonBase.Add("list", jsonArray);
                            File.WriteAllText(outPath, jsonBase.ToString());

                            classBuilder.CreateCode(_typeMap, entityPath);
                        }
                    }
                }
            }
        }

        private static void SetCoumnData(DataRow nameRow, DataRow typeRow)
        {
            _columnIdxDict = new Dictionary<string, int>();
            _columnTypeDict = new Dictionary<int, Type>();
            _typeMap = new Dictionary<string, Type>();

            for (int i = 0; i < nameRow.Table.Columns.Count; i++)
            {
                if (nameRow[i].ToString().StartsWith("#"))
                {
                    continue;
                }
                _columnIdxDict.Add(nameRow[i].ToString(), i);
                _columnTypeDict.Add(i, ConvertType(typeRow[i].ToString()));
                _typeMap.Add(nameRow[i].ToString(), ConvertType(typeRow[i].ToString()));
            }
        }

        private static Type ConvertType(string typeString)
        {
            switch (typeString)
            {
                default:
                    return typeof(string);
                case "int":
                    return typeof(int);
                case "float":
                    return typeof(float);
            }
        }

        public static List<T> GetDataList<T>(string json)
        {
            var data = JsonConvert.DeserializeObject<Wrapper<T>>(json);
            return data.list;
        }

    }
}