using Dapper;
using EVCB_OCPP.Domain;
using EVCB_OCPP.Domain.ConnectionFactory;
using EVCB_OCPP.WSServer.Helper;
using EVCB_OCPP.WSServer.Service.WsService;
using log4net;
using Microsoft.Data.SqlClient;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;
using NLog.Fluent;

using System;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using static System.Runtime.InteropServices.JavaScript.JSType;

namespace EVCB_OCPP.WSServer.Service.DbService;

public interface IConnectionLogdbService
{
    void WarmUpLog();
    void WriteMachineLog(WsClientData clientData, string data, string messageType, string errorMsg = "", bool isSent = false);
}

public class ConnectionLogdbService : IConnectionLogdbService
{
    public const string LimitConfigKey = "ConnectionLogDbLimit";

    public ConnectionLogdbService(
        IDbContextFactory<ConnectionLogDBContext> connectionLogdbContextFactory,
        ISqlConnectionFactory<ConnectionLogDBContext> sqlConnectionFactory,
        ILogger<ConnectionLogdbService> logger,
        IConfiguration configuration)
    {
        this.connectionLogdbContextFactory = connectionLogdbContextFactory;
        this.sqlConnectionFactory = sqlConnectionFactory;
        this.logger = logger;
        //connectionLogdbConnectionString = configuration.GetConnectionString("MeterValueDBContext");

        var opLimit = GetLimit(configuration);
        queueHandler = new(WriteMachineLogEF, opLimit);

        InitInsertConnectonLogHandler();
    }

    private readonly IDbContextFactory<ConnectionLogDBContext> connectionLogdbContextFactory;
    private readonly ISqlConnectionFactory<ConnectionLogDBContext> sqlConnectionFactory;
    private readonly ILogger<ConnectionLogdbService> logger;
    private readonly QueueHandler<MachineLog> queueHandler;
    //private readonly string connectionLogdbConnectionString;
    private readonly Queue<string> _existTables = new();
    private GroupHandler<MachineLog> insertConnectonLogHandler;

    public void WarmUpLog()
    {
        try
        {
            using (var log = connectionLogdbContextFactory.CreateDbContext())
            {
                log.MachineConnectionLog.ToList();
            }
        }
        catch (Exception ex)
        {
            logger.LogError(ex.Message);
            logger.LogError(ex.StackTrace);
            //Console.WriteLine(ex.ToString());
        }
    }

    public void WriteMachineLog(WsClientData clientData, string data, string messageType, string errorMsg = "", bool isSent = false)
    {
        var log = new MachineLog(clientData, data, messageType, errorMsg, isSent);
        //queueHandler.Enqueue(log);
        //_ = WriteMachineLogEF(log);
        insertConnectonLogHandler.HandleAsync(log);
        //_ = InsertWithDapper(log);
    }

    private void InitInsertConnectonLogHandler()
    {
        if (insertConnectonLogHandler is not null)
        {
            throw new Exception($"{nameof(InitInsertConnectonLogHandler)} should only called once");
        }

        insertConnectonLogHandler = new GroupHandler<MachineLog>(
            BundleInsertWithDapper,
            logger,
            workerCnt: 20
            );
    }

    private async Task WriteMachineLogEF(MachineLog log)
    {
        var watcher = Stopwatch.StartNew();

        try
        {
            if (log.clientData == null || string.IsNullOrEmpty(log.data)) return;

            if (log.clientData.ChargeBoxId == null)
            {
                logger.LogCritical(log.clientData.Path.ToString() + "]********************session ChargeBoxId null sessionId=" + log.clientData.SessionID);
            }
            string sp = "[dbo].[uspInsertMachineConnectionLog] @CreatedOn," +
                  "@ChargeBoxId,@MessageType,@Data,@Msg,@IsSent,@EVSEEndPoint,@Session";
            var dd = DateTime.UtcNow;
            SqlParameter[] parameter =
            {
                    new SqlParameter("CreatedOn", SqlDbType.DateTime){ Value = dd },
                    new SqlParameter("ChargeBoxId", SqlDbType.NVarChar, 50){ Value= log.clientData.ChargeBoxId==null?"unknown":log.clientData.ChargeBoxId.Replace("'","''") },
                    new SqlParameter("MessageType", SqlDbType.NVarChar , 50){ Value =  log.messageType.Replace("'","''")},
                    new SqlParameter("Data", SqlDbType.NVarChar, -1) { Value = log.data.Replace("'", "''") },
                    new SqlParameter("Msg", SqlDbType.NVarChar, 200) { Value = log.errorMsg.Replace("'", "''") },
                    new SqlParameter("IsSent", SqlDbType.Bit) { Value = log.isSent },
                    new SqlParameter("EVSEEndPoint", SqlDbType.NVarChar, 50) { Value = log.clientData.Endpoint == null ? "123" : log.clientData.Endpoint.ToString() },
                    new SqlParameter("Session", SqlDbType.NVarChar, 36) { Value = log.clientData.SessionID == null ? "123" : log.clientData.SessionID }
            };
            using (var db = await connectionLogdbContextFactory.CreateDbContextAsync())
            {
                await db.Database.ExecuteSqlRawAsync(sp, parameter);
            }
        }
        catch (Exception ex)
        {
            logger.LogError(ex.ToString());
        }

        watcher.Stop();
        if (watcher.ElapsedMilliseconds > 1000)
        {
            logger.LogWarning("WriteMachineLog too long {0}", watcher.ElapsedMilliseconds);
        }
    }

    private async Task BundleInsertWithDapper(BundleHandlerData<MachineLog> bundleHandlerData)
    {
        var watch = Stopwatch.StartNew();
        var times = new List<long>();
        var workTime = DateTime.UtcNow;

        var parmsList = bundleHandlerData.Datas.ToList();

        if (parmsList.Count == 0)
        {
            return;
        }

        var candidate = parmsList[0];
        if (!await GetTableExist(workTime))
        {
            times.Add(watch.ElapsedMilliseconds);
            await WriteMachineLogEF(candidate);
            times.Add(watch.ElapsedMilliseconds);

            if (watch.ElapsedMilliseconds > 500)
            {
                logger.LogWarning($"ConnectionLog InsertWithDapper {string.Join("/", times)}");
            }
            parmsList.Remove(candidate);
            bundleHandlerData.AddCompletedData(candidate);
        }

        times.Add(watch.ElapsedMilliseconds);
        using SqlConnection sqlConnection = await sqlConnectionFactory.CreateAsync();
        //using var trans = await sqlConnection.BeginTransactionAsync();

        times.Add(watch.ElapsedMilliseconds);
        var tableName = GetTableName(workTime);

        string withHourIndexCommand = $"""
        INSERT INTO {tableName} (CreatedOn, ChargeBoxId, MessageType, Data, Msg, IsSent, EVSEEndPoint, Session, HourIndex)
        VALUES (@CreatedOn, @ChargeBoxId, @MessageType, @Data, @Msg, @IsSent, @EVSEEndPoint, @Session, @HourIndex);
        """;

        string command = $"""
        INSERT INTO {tableName} (CreatedOn, ChargeBoxId, MessageType, Data, Msg, IsSent, EVSEEndPoint, Session)
        VALUES (@CreatedOn, @ChargeBoxId, @MessageType, @Data, @Msg, @IsSent, @EVSEEndPoint, @Session);
        """;

        foreach (var log in parmsList)
        {
            var parameters = new DynamicParameters();
            parameters.Add("CreatedOn", workTime, DbType.DateTime);
            parameters.Add("ChargeBoxId", log.clientData.ChargeBoxId == null ? "unknown" : log.clientData.ChargeBoxId.Replace("'", "''"), DbType.String, size: 50); ;
            parameters.Add("MessageType", log.messageType.Replace("'", "''"), DbType.String, size: 50);
            parameters.Add("Data", log.data.Replace("'", "''"), DbType.String);
            parameters.Add("Msg", log.errorMsg.Replace("'", "''"), DbType.String, size: 200);
            parameters.Add("IsSent", log.isSent, DbType.Boolean);
            parameters.Add("EVSEEndPoint", log.clientData.Endpoint == null ? "123" : log.clientData.Endpoint.ToString(), DbType.String, size: 50);
            parameters.Add("Session", log.clientData.SessionID == null ? "123" : log.clientData.SessionID, DbType.String, size: 36);
            parameters.Add("HourIndex", workTime.Hour, DbType.Int32);

            try
            {
                await sqlConnection.ExecuteAsync(withHourIndexCommand, parameters);
            }
            catch
            {
                logger.LogInformation("Connection Log insert with HourIndex failed, insert without HourIndex");
                await sqlConnection.ExecuteAsync(command, parameters);
            }

            bundleHandlerData.AddCompletedData(log);
        }

        times.Add(watch.ElapsedMilliseconds);
        //await trans.CommitAsync();

        watch.Stop();
        if (watch.ElapsedMilliseconds > 1000)
        {
            logger.LogWarning($"MachineLog Bundle Dapper {string.Join("/", times)} count:{bundleHandlerData.Datas.Count()}");
        }

        return;
    }

    private async ValueTask<bool> GetTableExist(DateTime tableDateTime)
    {
        var tableName = GetTableName(tableDateTime);
        if (_existTables.Contains(tableName))
        {
            return true;
        }

        FormattableString checkTableSql = $"SELECT Count(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = {tableName}";

        using var db = await connectionLogdbContextFactory.CreateDbContextAsync();
        var resultList = await db.Database.SqlQuery<int>(checkTableSql)?.ToListAsync();

        if (resultList is not null && resultList.Count > 0 && resultList[0] > 0)
        {
            _existTables.Enqueue(tableName);
            if (_existTables.Count > 30)
            {
                _existTables.TryDequeue(out _);
            }
            return true;
        }

        return false;
    }
    private static string GetTableName(DateTime dateTime)
        => $"MachineConnectionLog{dateTime:yyMMdd}";

    private int GetLimit(IConfiguration configuration)
    {
        var limitConfig = configuration[LimitConfigKey];
        int limit = 10;
        if (limitConfig != default)
        {
            int.TryParse(limitConfig, out limit);
        }
        return limit;
    }
}

internal record MachineLog(WsClientData clientData, string data, string messageType, string errorMsg, bool isSent);