using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Policy;
using System.Text;
using System.Threading.Tasks;
using MySql.Data.MySqlClient;
using Dapper;
using ZKLT.Hadoop.Interface;
using ZKLT.Hadoop.Model;
using MySqlX.XDevAPI.Relational;
using Mysqlx.Crud;

namespace ZKLT.Hadoop
{
    public class TableService : ITableService
    {
        /// <summary>
        /// 合并条件
        /// </summary>
        /// <param name="table">表</param>
        /// <param name="where">条件</param>
        /// <param name="row">数据</param>
        /// <param name="command">命令</param>
        /// <param name="param">参数</param>
        private void MergeWhere(HDP_Table table, Dictionary<string, string>? where, Dictionary<string, object>? row, StringBuilder command, Dictionary<string, object> param)
        {
            //执行条件
            StringBuilder _wherestr = new StringBuilder();
            _wherestr.Append("WHERE 1 = 1");
            if (where != null && where.Count > 0)
            {
                for (var i = 0; i < table.Columns!.Length; i++)
                {
                    var _column = table.Columns[i];
                    if (where.ContainsKey(_column.Key!))
                    {
                        switch (where[_column.Key!])
                        {
                            case HDP_WhereType.LIKE:
                                _wherestr.Append($@" AND `{_column.Key!}` {where[_column.Key!]} CONCAT('%',@{_column.Key!},'%')");
                                break;
                            default:
                                _wherestr.Append($@" AND `{_column.Key!}` {where[_column.Key!]} @{_column.Key!}");
                                break;
                        }
                        param.Add(_column.Key!, row![_column.Key!]);
                    }
                }
                command.AppendLine(_wherestr.ToString());
            }
        }

        /// <summary>
        /// 同步结构
        /// </summary>
        /// <param name="source">数据源</param>
        /// <param name="table">数据表</param>
        /// <returns>是否成功</returns>
        public bool InitStruct(HDP_Source source, HDP_Table table)
        {
            //数据校验
            if (string.IsNullOrEmpty(table.Key))
            {
                throw new ArgumentNullException("表键无效");
            }
            if (table.Columns == null || table.Columns.Length == 0)
            {
                throw new ArgumentNullException("列无效");
            }
            using (MySqlConnection _connection = new MySqlConnection(source.GetConnectString()))
            {
                try
                {
                    _connection.Open();
                }
                catch
                {
                    throw new ArgumentException("数据源连接失败");
                }

                StringBuilder _command = new StringBuilder();
                if (DbExistTable(source, table.Key))
                {
                    var _dbColumns = DbGetColumns(source, table.Key);
                    _command.AppendLine($@"ALTER TABLE `{table.Key}`");
                    _command.AppendLine("DROP PRIMARY KEY,");

                    //加载列
                    for (var i = 0; i < table.Columns.Length; i++)
                    {
                        StringBuilder _colstr = new StringBuilder();
                        var _column = table.Columns[i];
                        if (_dbColumns.Any(x => x.Key!.ToLower() == _column.Key!.ToLower()))
                        {
                            _colstr.Append($@"MODIFY `{_column.Key}`");
                        }
                        else
                        {
                            _colstr.Append($@"ADD `{_column.Key}`");
                        }
                        switch (_column.DataType)
                        {
                            case HDP_ColumnDataType.VARCHAR:
                                if (_column.Length == 0)
                                {
                                    throw new ArgumentNullException(@$"列{_column.Key}长度无效");
                                }
                                _colstr.Append($@" {_column.DataType}({_column.Length})");
                                break;
                            case HDP_ColumnDataType.DECIMAL:
                                if (_column.Length == 0 || _column.DecimalLength == 0)
                                {
                                    throw new ArgumentNullException(@$"列{_column.Key}长度无效");
                                }
                                _colstr.Append($@" {_column.DataType}({_column.Length},{_column.DecimalLength})");
                                break;
                            default:
                                _colstr.Append(@$" {_column.DataType}");
                                break;
                        }
                        if (!string.IsNullOrEmpty(_column.Description))
                        {
                            _colstr.Append($@" COMMENT '{_column.Description}'");
                        }
                        _colstr.Append(",");
                        _command.AppendLine(_colstr.ToString());
                    }

                    //加载主键
                    var _primarys = table.Columns.Where(x => x.IsPrimary == true).ToArray();
                    if (_primarys.Length > 0)
                    {
                        StringBuilder _primaryStr = new StringBuilder();
                        _primaryStr.Append("ADD PRIMARY KEY (");
                        for (var i = 0; i < _primarys.Length; i++)
                        {
                            var _primary = _primarys[i];
                            _primaryStr.Append($@"`{_primary.Key}`");
                            if (i < _primarys.Length - 1)
                            {
                                _primaryStr.Append(",");
                            }
                        }
                        _primaryStr.Append(")");
                        _command.AppendLine(_primaryStr.ToString());
                    }
                    if (!string.IsNullOrEmpty(table.Description))
                    {
                        _command.AppendLine(@$"COMMENT '{table.Description}'");
                    }
                    _connection.Execute(_command.ToString());
                    return true;
                }
                else
                {
                    _command.AppendLine($@"CREATE TABLE `{table.Key}` (");

                    //加载列
                    for (int i = 0; i < table.Columns.Length; i++)
                    {
                        StringBuilder _colstr = new StringBuilder();
                        var _column = table.Columns[i];
                        _colstr.Append($@"`{_column.Key}`");
                        switch (_column.DataType)
                        {
                            case HDP_ColumnDataType.VARCHAR:
                                if (_column.Length == 0)
                                {
                                    throw new ArgumentNullException(@$"列{_column.Key}长度无效");
                                }
                                _colstr.Append($@" {_column.DataType}({_column.Length})");
                                break;
                            case HDP_ColumnDataType.DECIMAL:
                                if (_column.Length == 0 || _column.DecimalLength == 0)
                                {
                                    throw new ArgumentNullException(@$"列{_column.Key}长度无效");
                                }
                                _colstr.Append($@" {_column.DataType}({_column.Length},{_column.DecimalLength})");
                                break;
                            default:
                                _colstr.Append(@$" {_column.DataType}");
                                break;
                        }
                        if (!string.IsNullOrEmpty(_column.Description))
                        {
                            _colstr.Append($@" COMMENT '{_column.Description}'");
                        }
                        if (i < table.Columns.Length - 1)
                        {
                            _colstr.Append(",");
                        }
                        _command.AppendLine(_colstr.ToString());
                    }

                    //加载主键
                    var _primarys = table.Columns.Where(x => x.IsPrimary == true).ToArray();
                    if (_primarys.Length > 0)
                    {
                        _command.Append(",");
                        StringBuilder _primaryStr = new StringBuilder();
                        _primaryStr.Append("PRIMARY KEY (");
                        for (var i = 0; i < _primarys.Length; i++)
                        {
                            var _primary = _primarys[i];
                            _primaryStr.Append($@"`{_primary.Key}`");
                            if (i < _primarys.Length - 1)
                            {
                                _primaryStr.Append(",");
                            }
                        }
                        _primaryStr.Append(")");
                        _command.AppendLine(_primaryStr.ToString());
                    }

                    _command.AppendLine(")");
                    if (!string.IsNullOrEmpty(table.Description))
                    {
                        _command.AppendLine(@$"COMMENT '{table.Description}'");
                    }
                    _connection.Execute(_command.ToString());
                }
                _connection.Close();
                return true;
            }
        }

        /// <summary>
        /// 删除结构
        /// </summary>
        /// <param name="source">源</param>
        /// <param name="tableKey">表</param>
        /// <returns>是否成功</returns>
        public bool RemoveStruct(HDP_Source source, string tableKey)
        {
            //数据校验
            if (string.IsNullOrEmpty(tableKey))
            {
                throw new ArgumentNullException("表键无效");
            }
            if (!DbExistTable(source, tableKey))
            {
                throw new ArgumentNullException("表不存在");
            }

            using (MySqlConnection _connection = new MySqlConnection(source.GetConnectString()))
            {
                try
                {
                    _connection.Open();
                }
                catch
                {
                    throw new ArgumentException("数据源连接失败");
                }

                StringBuilder _command = new StringBuilder();
                _command.AppendLine(@$"DROP TABLE {tableKey}");
                _connection.Execute(_command.ToString());
                _connection.Close();
                return !DbExistTable(source, tableKey);
            }
        }

        /// <summary>
        /// 插入数据
        /// </summary>
        /// <param name="source">数据源</param>
        /// <param name="table">数据表</param>
        /// <param name="row">数据</param>
        /// <returns>是否成功</returns>
        public bool Insert(HDP_Source source, HDP_Table table, Dictionary<string, object> row)
        {
            //数据校验
            if (string.IsNullOrEmpty(table.Key))
            {
                throw new ArgumentNullException("表键无效");
            }
            if (table.Columns == null || table.Columns.Length == 0)
            {
                throw new ArgumentNullException("列无效");
            }
            if (row == null || row.Count == 0)
            {
                throw new ArgumentNullException("数据无效");
            }
            using (MySqlConnection _connection = new MySqlConnection(source.GetConnectString()))
            {
                try
                {
                    _connection.Open();
                }
                catch
                {
                    throw new ArgumentException("数据源连接失败");
                }
                StringBuilder _command = new StringBuilder();

                //主键检查
                var _primarys = table.Columns.Where(x => x.IsPrimary == true).ToArray();
                for (var i = 0; i < _primarys.Length; i++)
                {
                    var _primary = _primarys[i];
                    if (row[_primary.Key!] == null || string.IsNullOrEmpty(row[_primary.Key!].ToString()))
                    {
                        throw new ArgumentException($@"主键{_primary.Key}值无效");
                    }
                }

                //插入命令
                _command.AppendLine($@"INSERT INTO `{table.Key}` (");
                StringBuilder _colstr = new StringBuilder();
                StringBuilder _parmstr = new StringBuilder();
                Dictionary<string, object> _params = new Dictionary<string, object>();
                for (var i = 0; i < table.Columns.Length; i++)
                {
                    var _column = table.Columns[i];
                    if (row.ContainsKey(_column.Key!))
                    {
                        _colstr.Append($@"`{_column.Key!}`,");
                        _parmstr.Append($@"@{_column.Key},");
                        _params.Add(_column.Key!, row[_column.Key!]);
                    }
                    else if (!string.IsNullOrEmpty(_column.InsertDefault))
                    {
                        if (HDP_CommandAction.IsAction(_column.InsertDefault))
                        {
                            _colstr.Append($@"`{_column.Key!}`,");
                            _parmstr.Append($"{_column.InsertDefault},");
                        }
                        else
                        {
                            _colstr.Append($@"`{_column.Key!}`,");
                            _parmstr.Append($@"@{_column.Key},");
                            _params.Add(_column.Key!, _column.InsertDefault);
                        }
                    }
                }
                if (_colstr[_colstr.Length - 1] == ',')
                {
                    _colstr.Remove(_colstr.Length - 1, 1);
                }
                if (_parmstr[_parmstr.Length - 1] == ',')
                {
                    _parmstr.Remove(_parmstr.Length - 1, 1);
                }
                _command.AppendLine(_colstr.ToString());
                _command.AppendLine(") VALUES (");
                _command.AppendLine(_parmstr.ToString());
                _command.AppendLine(")");
                var _result = _connection.Execute(HDP_CommandAction.ConvertCommand(_command.ToString(), row), _params);
                _connection.Close();
                if (_result > 0)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
        }

        /// <summary>
        /// 更新
        /// </summary>
        /// <param name="source">数据源</param>
        /// <param name="table">数据表</param>
        /// <param name="where">条件</param>
        /// <param name="row">数据</param>
        /// <returns>是否成功</returns>
        public bool Update(HDP_Source source, HDP_Table table, Dictionary<string, string> where, Dictionary<string, object> row)
        {
            //数据校验
            if (string.IsNullOrEmpty(table.Key))
            {
                throw new ArgumentNullException("表键无效");
            }
            if (table.Columns == null || table.Columns.Length == 0)
            {
                throw new ArgumentNullException("列无效");
            }
            if (where == null || where.Count == 0)
            {
                throw new ArgumentNullException("条件无效");
            }
            if (row == null || row.Count == 0)
            {
                throw new ArgumentNullException("数据无效");
            }
            using (MySqlConnection _connection = new MySqlConnection(source.GetConnectString()))
            {
                try
                {
                    _connection.Open();
                }
                catch
                {
                    throw new ArgumentException("数据源连接失败");
                }

                //更新命令
                StringBuilder _command = new StringBuilder();
                Dictionary<string, object> _params = new Dictionary<string, object>();
                _command.AppendLine(@$"UPDATE `{table.Key}` SET ");

                //更新列
                StringBuilder _colstr = new StringBuilder();
                for (var i = 0; i < table.Columns.Length; i++)
                {
                    var _column = table.Columns[i];
                    if (row.ContainsKey(_column.Key!) && !where.ContainsKey(_column.Key!))
                    {
                        _colstr.Append($@"`{_column.Key!}`=@{_column.Key!},");
                        _params.Add(_column.Key!, row[_column.Key!]);
                    }
                    else if (!string.IsNullOrEmpty(_column.UpdateDefault))
                    {
                        if (HDP_CommandAction.IsAction(_column.UpdateDefault))
                        {
                            _colstr.Append($@"`{_column.Key!}`={_column.UpdateDefault}");
                        }
                        else
                        {
                            _colstr.Append($@"`{_column.Key!}`=@{_column.Key!},");
                            _params.Add(_column.Key!, _column.UpdateDefault);
                        }
                    }
                }
                if (_colstr[_colstr.Length - 1] == ',')
                {
                    _colstr.Remove(_colstr.Length - 1, 1);
                }
                _command.AppendLine(_colstr.ToString());

                //执行条件
                MergeWhere(table, where, row, _command, _params);

                var _result = _connection.Execute(HDP_CommandAction.ConvertCommand(_command.ToString(), row), _params);
                _connection.Close();
                if (_result > 0)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
        }

        /// <summary>
        /// 删除
        /// </summary>
        /// <param name="source">数据源</param>
        /// <param name="table">数据表</param>
        /// <param name="where">条件</param>
        /// <param name="row">数据</param>
        /// <returns>是否成功</returns>
        public bool Delete(HDP_Source source, HDP_Table table, Dictionary<string, string> where, Dictionary<string, object> row)
        {
            //数据校验
            if (string.IsNullOrEmpty(table.Key))
            {
                throw new ArgumentNullException("表键无效");
            }
            if (table.Columns == null || table.Columns.Length == 0)
            {
                throw new ArgumentNullException("列无效");
            }
            if (where == null || where.Count == 0)
            {
                throw new ArgumentNullException("条件无效");
            }
            if (row == null || row.Count == 0)
            {
                throw new ArgumentNullException("数据无效");
            }
            using (MySqlConnection _connection = new MySqlConnection(source.GetConnectString()))
            {
                try
                {
                    _connection.Open();
                }
                catch
                {
                    throw new ArgumentException("数据源连接失败");
                }

                //更新命令
                StringBuilder _command = new StringBuilder();
                Dictionary<string, object> _params = new Dictionary<string, object>();
                _command.AppendLine(@$"DELETE FROM `{table.Key}`");

                MergeWhere(table, where, row, _command, _params);

                var _result = _connection.Execute(HDP_CommandAction.ConvertCommand(_command.ToString(), row), _params);
                _connection.Close();
                if (_result > 0)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
        }

        /// <summary>
        /// 查询单个
        /// </summary>
        /// <param name="source">数据源</param>
        /// <param name="table">数据表</param>
        /// <param name="where">条件</param>
        /// <param name="row">数据</param>
        /// <returns>结果</returns>
        public T? QuerySingle<T>(HDP_Source source, HDP_Table table, Dictionary<string, string> where, Dictionary<string, object> row)
        {
            //数据校验
            if (string.IsNullOrEmpty(table.Key))
            {
                throw new ArgumentNullException("表键无效");
            }
            if (table.Columns == null || table.Columns.Length == 0)
            {
                throw new ArgumentNullException("列无效");
            }
            if (where == null || where.Count == 0)
            {
                throw new ArgumentNullException("条件无效");
            }
            if (row == null || row.Count == 0)
            {
                throw new ArgumentNullException("数据无效");
            }
            using (MySqlConnection _connection = new MySqlConnection(source.GetConnectString()))
            {
                try
                {
                    _connection.Open();
                }
                catch
                {
                    throw new ArgumentException("数据源连接失败");
                }

                //查询命令
                StringBuilder _command = new StringBuilder();
                Dictionary<string, object> _params = new Dictionary<string, object>();
                _command.AppendLine(@$"SELECT * FROM `{table.Key}`");

                //执行条件
                MergeWhere(table, where, row, _command, _params);

                var _result = _connection.Query<T>(HDP_CommandAction.ConvertCommand(_command.ToString(), row), _params).ToArray();
                _connection.Close();
                if (_result.Length > 0)
                {
                    return _result[0];
                }
                else
                {
                    return default(T);
                }
            }
        }

        /// <summary>
        /// 查询列表
        /// </summary>
        /// <typeparam name="T">返回类型</typeparam>
        /// <param name="source">数据源</param>
        /// <param name="table">数据表</param>
        /// <param name="where">条件</param>
        /// <param name="row">数据</param>
        /// <returns>结果集</returns>
        public T[] Query<T>(HDP_Source source, HDP_Table table, Dictionary<string, string>? where = null, Dictionary<string, object>? row = null, Dictionary<string, string>? order = null)
        {
            //数据校验
            if (string.IsNullOrEmpty(table.Key))
            {
                throw new ArgumentNullException("表键无效");
            }
            if (table.Columns == null || table.Columns.Length == 0)
            {
                throw new ArgumentNullException("列无效");
            }
            using (MySqlConnection _connection = new MySqlConnection(source.GetConnectString()))
            {
                try
                {
                    _connection.Open();
                }
                catch
                {
                    throw new ArgumentException("数据源连接失败");
                }

                //查询命令
                StringBuilder _command = new StringBuilder();
                Dictionary<string, object> _params = new Dictionary<string, object>();
                _command.AppendLine(@$"SELECT * FROM `{table.Key}`");

                //执行条件
                MergeWhere(table, where, row, _command, _params);

                //执行排序
                StringBuilder _orderstr = new StringBuilder();
                _orderstr.Append("ORDER BY ");
                if (order != null && order.Count > 0)
                {
                    for (var i = 0; i < table.Columns.Length; i++)
                    {
                        var _column = table.Columns[i];
                        if (order.ContainsKey(_column.Key!))
                        {
                            switch (order[_column.Key!])
                            {
                                case "DESC":
                                    _orderstr.Append($@"`{_column.Key!}` DESC,");
                                    break;
                                default:
                                    _orderstr.Append($@"`{_column.Key!}` ASC,");
                                    break;
                            }
                        }
                    }
                    if (_orderstr[_orderstr.Length - 1] == ',')
                    {
                        _orderstr.Remove(_orderstr.Length - 1, 1);
                    }
                    _command.AppendLine(_orderstr.ToString());
                }
                var _result = _connection.Query<T>(HDP_CommandAction.ConvertCommand(_command.ToString(), row), _params);
                _connection.Close();
                return _result.ToArray();
            }
        }

        /// <summary>
        /// 查询列表
        /// </summary>
        /// <typeparam name="T">返回类型</typeparam>
        /// <param name="source">数据源</param>
        /// <param name="table">数据表</param>
        /// <param name="where">条件</param>
        /// <param name="row">数据</param>
        /// <returns>结果集</returns>
        public HDP_Page<T> QueryPage<T>(HDP_Source source, HDP_Table table, int pageIndex, int pageSize, Dictionary<string, string>? where = null, Dictionary<string, object>? row = null, Dictionary<string, string>? order = null)
        {
            //数据校验
            if (string.IsNullOrEmpty(table.Key))
            {
                throw new ArgumentNullException("表键无效");
            }
            if (table.Columns == null || table.Columns.Length == 0)
            {
                throw new ArgumentNullException("列无效");
            }
            using (MySqlConnection _connection = new MySqlConnection(source.GetConnectString()))
            {
                try
                {
                    _connection.Open();
                }
                catch
                {
                    throw new ArgumentException("数据源连接失败");
                }

                //查询命令
                StringBuilder _command = new StringBuilder();
                Dictionary<string, object> _params = new Dictionary<string, object>();
                _command.AppendLine(@$"SELECT * FROM `{table.Key}`");

                //执行条件
                MergeWhere(table, where, row, _command, _params);

                //执行排序
                StringBuilder _orderstr = new StringBuilder();
                _orderstr.Append("ORDER BY ");
                if (order != null && order.Count > 0)
                {
                    for (var i = 0; i < table.Columns.Length; i++)
                    {
                        var _column = table.Columns[i];
                        if (order.ContainsKey(_column.Key!))
                        {
                            switch (order[_column.Key!])
                            {
                                case "DESC":
                                    _orderstr.Append($@"`{_column.Key!}` DESC,");
                                    break;
                                default:
                                    _orderstr.Append($@"`{_column.Key!}` ASC,");
                                    break;
                            }
                        }
                    }
                    if (_orderstr[_orderstr.Length - 1] == ',')
                    {
                        _orderstr.Remove(_orderstr.Length - 1, 1);
                    }
                    _command.AppendLine(_orderstr.ToString());
                }
                var _result = new HDP_Page<T>();
                _result.PageIndex = pageIndex;
                _result.PageSize = pageSize;
                StringBuilder _totalstr = new StringBuilder();
                _totalstr.AppendLine($@"SELECT COUNT(0) FROM (");
                _totalstr.AppendLine(_command.ToString());
                _totalstr.AppendLine(") AS Temp");
                _result.Total = _connection.QuerySingle<int>(_totalstr.ToString(), _params);
                StringBuilder _pagestr = new StringBuilder();
                _pagestr.AppendLine($@"SELECT * FROM (");
                _pagestr.AppendLine(_command.ToString());
                _pagestr.AppendLine(") AS Temp");
                _pagestr.AppendLine(@$"LIMIT {(_result.PageIndex - 1) * _result.PageSize},{_result.PageSize}");
                _result.Data = _connection.Query<T>(HDP_CommandAction.ConvertCommand(_pagestr.ToString(), row), _params).ToArray();
                _connection.Close();
                return _result;
            }
        }

        /// <summary>
        /// 判断数据源是否存在表
        /// </summary>
        /// <param name="source">数据源</param>
        /// <param name="tableName">表名</param>
        /// <returns>是否存在</returns>
        public bool DbExistTable(HDP_Source source, string tableName)
        {
            using (MySqlConnection _connection = new MySqlConnection(source.GetConnectString()))
            {
                try
                {
                    _connection.Open();
                }
                catch
                {
                    throw new ArgumentException("数据源连接失败");
                }

                StringBuilder _command = new StringBuilder();
                _command.AppendLine($@"SELECT COUNT(0) FROM INFORMATION_SCHEMA.TABLES WHERE `TABLE_TYPE`='BASE TABLE' AND `TABLE_SCHEMA`=@SourceKey AND `TABLE_NAME` =@TableKey");
                int _result = _connection.QuerySingle<int>(_command.ToString(), new { SourceKey = source.Key, TableKey = tableName });
                _connection.Close();
                if (_result > 0)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
        }

        /// <summary>
        /// 查询数据列
        /// </summary>
        /// <param name="source">数据源</param>
        /// <param name="tableName">表名</param>
        /// <returns>列</returns>
        public HDP_Column[] DbGetColumns(HDP_Source source, string tableName)
        {
            using (MySqlConnection _connection = new MySqlConnection(source.GetConnectString()))
            {
                var _result = new List<HDP_Column>();
                try
                {
                    _connection.Open();
                }
                catch
                {
                    throw new ArgumentException("数据源连接失败");
                }

                StringBuilder _command = new StringBuilder();
                _command.AppendLine($@"SELECT `COLUMN_NAME` AS `Key`,`DATA_TYPE` AS `DataType`,`COLUMN_COMMENT` AS `Description` FROM INFORMATION_SCHEMA.COLUMNS 
                        WHERE `TABLE_SCHEMA`=@SourceKey AND `TABLE_NAME`=@TableKey");
                _result.AddRange(_connection.Query<HDP_Column>(_command.ToString(), new { SourceKey = source.Key, TableKey = tableName }));
                _connection.Close();
                return _result.ToArray();
            }
        }
    }
}