using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Diagnostics;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace SystemX.Product.CP.TRA.Extract
{

    public class DBService
    {
        public string CPXV2ConnectionString { get; set; }
        public string ConnectionString { get; set; }

        public List<TestList> GetTestList(Config config)
        {
            List<TestList> result = new List<TestList>();

            // 1. 연결 생성
            using (SqlConnection conn = new SqlConnection(CPXV2ConnectionString))
            {
                try
                {
                    // 2. 실행할 쿼리 작성 (JOIN 포함)
                    string sql = $@"SELECT [No]
                      ,[TestListFileNo]
                      ,[StepID]                      
                      ,[StepVersion]      
                      ,[StepDesc]
                      ,[SpecMin]
                      ,[SpecMax]
                      ,[Dim]
                  FROM [CPXV2].[dbo].[VRFY_TestListFileRelease]  WITH(NOLOCK) where StepDesc = '{config.MO}'";

                    SqlCommand cmd = new SqlCommand(sql, conn);
                    // 타임아웃 설정 (600만 건은 시간이 걸릴 수 있으므로 0(무제한) 또는 넉넉하게 설정)
                    cmd.CommandTimeout = 300;
                    conn.Open();
                    
                    // 3. DataReader로 데이터 읽기
                    using (SqlDataReader reader = cmd.ExecuteReader())
                    {
                        while (reader.Read())
                        {
                            var tl = new TestList
                            {
                                TestListFileNo = Convert.ToInt32(reader["TestListFileNo"]),
                                StepID = Convert.ToInt32(reader["StepID"]),
                                StepVersion = Convert.ToInt32(reader["StepVersion"]),
                                StepDesc = reader["StepDesc"].ToString(),
                                SpecMin = reader["SpecMin"].ToString(),
                                SpecMax = reader["SpecMax"].ToString(),
                                Dim = reader["Dim"].ToString(),
                            };
                            result.Add(tl);
                        }
                    }
                }
                catch (SqlException ex)
                {
                    Console.WriteLine("DB 오류 발생: " + ex.Message);
                }
            }

            Console.WriteLine($"{config.MO} 포함 테스트리스트 개수: {result.Count}");

            return result;
        }

        public void GetLargeData(List<TestList> testList, Config config)
        {
            int rowCount = 0;
            int fileNo = 0;
            string fileName = $"";

            foreach (var tl in testList)
            {
                Console.WriteLine($"진행중 테스트리스트(MO:{config.MO}): TestListFileNo:{tl.TestListFileNo}, StepVersion:{tl.StepVersion}");

                // 1. 연결 생성
                using (SqlConnection conn = new SqlConnection(ConnectionString))
                {
                    try
                    {
                        // 2. 실행할 쿼리 작성 (JOIN 포함)
                        //string sql = $@"SELECT * FROM {config.SummaryTable} as Summary WITH(NOLOCK) 
                        //JOIN {config.ResultTable} as Result WITH(NOLOCK) ON Summary.No = Result.No
                        //WHERE TestListFileNo = {tl.TestListFileNo} and StepVersion={tl.StepVersion}";

                        string sql = $@"SELECT     
	                                        Summary.*,
                                            Result.*,
                                            TL.StepVersion AS Matched_StepVersion
                                        FROM [{config.DataBase}].[dbo].[{config.SummaryTable}] AS Summary WITH(NOLOCK)
                                        JOIN [{config.DataBase}].[dbo].[{config.ResultTable}] AS Result WITH(NOLOCK) 
                                        ON Summary.No = Result.No
                                        OUTER APPLY (
                                            SELECT TOP 1 *
                                            FROM [CPXV2].[dbo].[VRFY_TestListFileRelease]
                                            WHERE StepVersion <= Summary.StepVersion and TestListFileNo = {tl.TestListFileNo} and StepDesc = '{config.MO}'
                                            ORDER BY StepVersion DESC
                                        ) AS TL
                                        WHERE Summary.TestListFileNo = {tl.TestListFileNo} and StepVersion=TL.StepVersion";

                        //test code
                        if(string.IsNullOrEmpty(config.TestCode) == false)
                            sql += $" and TestCode = '{config.TestCode}'";

                        //productNo
                        if(string.IsNullOrEmpty(config.ProductNo) == false)
                            sql += $" and ProdNo_C = '{config.ProductNo}'";

                        //TestDT
                        DateTime endDate = Convert.ToDateTime(config.EndDate).AddDays(1);
                        sql += $" and '{config.StartDate}' <= Summary.TestDT and  Summary.TestDT < '{endDate.ToString("yyyy-MM-dd")}'";

                        SqlCommand cmd = new SqlCommand(sql, conn);
                        // 타임아웃 설정 (600만 건은 시간이 걸릴 수 있으므로 0(무제한) 또는 넉넉하게 설정)
                        cmd.CommandTimeout = 0;
                        conn.Open();

                        // 3. DataReader로 데이터 읽기
                        using (SqlDataReader reader = cmd.ExecuteReader())
                        {
                            bool queryLog = false;

                            while (reader.Read())
                            {
                                if (queryLog == false)
                                {
                                    Console.ForegroundColor = ConsoleColor.DarkYellow;
                                    Thread.Sleep(10);
                                    Console.WriteLine($"Query: {sql}");
                                    Console.ForegroundColor = ConsoleColor.White;
                                    queryLog = true;
                                }
                                    
                                // 예: 데이터 처리 로직
                                var val = Decompression(reader["LogData"].ToString());
                                var date = Convert.ToDateTime(reader["TestDT"]);

                                var productNo = reader["ProdNo_C"].ToString();
                                var testCode = reader["TestCode"].ToString();
                                var host = reader["HostID"].ToString();
                                var productID = reader["ProductID"].ToString();
                                
                                var r = JsonConvert.DeserializeObject<List<TestResult>>(val);
                                var findStep = r.Find(x => x.StepID == tl.StepID);

                                if (rowCount % config.RowCount == 0)
                                {
                                    rowCount = 0;
                                    fileNo += 1;

                                    fileName = $"{config.MO}";

                                    //testcode
                                    if (string.IsNullOrEmpty(config.TestCode) == false)
                                        fileName += $"_{testCode}";

                                    if(string.IsNullOrEmpty(config.ProductNo) == false)
                                        fileName += $"_{productNo}";

                                    fileName += $"_{config.StartDate}_{config.EndDate}";

                                    File.AppendAllText($"{fileName}_{fileNo}.csv", $"ProductNo,TestCode,TestDT,MO,MeasVal,MeasValStr,Host,ProductID\n");
                                    Console.WriteLine($"Create New File: {fileName}_{fileNo}.csv");
                                }

                                if (findStep != null)
                                {
                                    File.AppendAllText($"./{fileName}_{fileNo}.csv", $"{productNo},{testCode},{date.ToString("yyyy-MM-dd HH:mm:ss")},{tl.StepDesc},{findStep.MeasVal},{findStep.MeasValStr},{host},{productID}\n");
                                    rowCount += 1;
                                }                                             
                            }
                        }
                    }
                    catch (SqlException ex)
                    {
                        Console.WriteLine("DB 오류 발생: " + ex.Message);
                    }
                }
            }
        }

        public static string Decompression(string compressedDataStr)
        {
            string result = null;
            byte[] buffer = Convert.FromBase64String(compressedDataStr);
            using (MemoryStream stream = new MemoryStream(buffer))
            {
                using (GZipStream stream2 = new GZipStream(stream, CompressionMode.Decompress))
                {
                    using (StreamReader streamReader = new StreamReader(stream2))
                    {
                        result = streamReader.ReadToEnd();
                    }
                }                    
            }

            return result;
        }
    }
}