<?php

namespace Ss\Etc;

/*!
 * Medoo database framework
 * http://medoo.in
 * Version 0.9.8
 * 
 * Copyright 2015, Angel Lai
 * Released under the MIT license
 */
class Medoo
{
	// General
	protected $database_type;

	protected $charset;

	protected $database_name;

	// For MySQL, MariaDB, MSSQL, Sybase, PostgreSQL, Oracle
	protected $server;

	protected $username;

	protected $password;

	// For SQLite
	protected $database_file;

	// For MySQL or MariaDB with unix_socket
	protected $socket;

	// Optional
	protected $port;

	protected $option = array();

	// Variable
	protected $logs = array();

	protected $debug_mode = false;

	public function __construct($options = null)
	{
		try {
			$commands = array();

			if (is_string($options) && !empty($options))
			{
				if (strtolower($this->database_type) == 'sqlite')
				{
					$this->database_file = $options;
				}
				else
				{
					$this->database_name = $options;
				}
			}
			elseif (is_array($options))
			{
				foreach ($options as $option => $value)
				{
					$this->$option = $value;
				}
			}

			if (
				isset($this->port) &&
				is_int($this->port * 1)
			)
			{
				$port = $this->port;
			}

			$type = strtolower($this->database_type);
			$is_port = isset($port);

			switch ($type)
			{
				case 'mariadb':
					$type = 'mysql';

				case 'mysql':
					if ($this->socket)
					{
						$dsn = $type . ':unix_socket=' . $this->socket . ';dbname=' . $this->database_name;
					}
					else
					{
						$dsn = $type . ':host=' . $this->server . ($is_port ? ';port=' . $port : '') . ';dbname=' . $this->database_name;
					}

					// Make MySQL using standard quoted identifier
					$commands[] = 'SET SQL_MODE=ANSI_QUOTES';
					break;

				case 'pgsql':
					$dsn = $type . ':host=' . $this->server . ($is_port ? ';port=' . $port : '') . ';dbname=' . $this->database_name;
					break;

				case 'sybase':
					$dsn = 'dblib:host=' . $this->server . ($is_port ? ':' . $port : '') . ';dbname=' . $this->database_name;
					break;

				case 'oracle':
					$dbname = $this->server ?
						'//' . $this->server . ($is_port ? ':' . $port : ':1521') . '/' . $this->database_name :
						$this->database_name;

					$dsn = 'oci:dbname=' . $dbname . ($this->charset ? ';charset=' . $this->charset : '');
					break;

				case 'mssql':
					$dsn = strstr(PHP_OS, 'WIN') ?
						'sqlsrv:server=' . $this->server . ($is_port ? ',' . $port : '') . ';database=' . $this->database_name :
						'dblib:host=' . $this->server . ($is_port ? ':' . $port : '') . ';dbname=' . $this->database_name;

					// Keep MSSQL QUOTED_IDENTIFIER is ON for standard quoting
					$commands[] = 'SET QUOTED_IDENTIFIER ON';
					break;

				case 'sqlite':
					$dsn = $type . ':' . $this->database_file;
					$this->username = null;
					$this->password = null;
					break;
			}

			if (
				in_array($type, explode(' ', 'mariadb mysql pgsql sybase mssql')) &&
				$this->charset
			)
			{
				$commands[] = "SET NAMES '" . $this->charset . "'";
			}

			$this->pdo = new PDO(
				$dsn,
				$this->username,
				$this->password,
				$this->option
			);

			foreach ($commands as $value)
			{
				$this->pdo->exec($value);
			}
		}
		catch (PDOException $e) {
			throw new Exception($e->getMessage());
		}
	}

	public function query($query)
	{
		if ($this->debug_mode)
		{
			echo $query;

			$this->debug_mode = false;

			return false;
		}

		array_push($this->logs, $query);

		return $this->pdo->query($query);
	}

	public function exec($query)
	{
		if ($this->debug_mode)
		{
			echo $query;

			$this->debug_mode = false;

			return false;
		}

		array_push($this->logs, $query);

		return $this->pdo->exec($query);
	}

	public function quote($string)
	{
		return $this->pdo->quote($string);
	}

	protected function column_quote($string)
	{
		return '"' . str_replace('.', '"."', preg_replace('/(^#|\(JSON\))/', '', $string)) . '"';
	}

	protected function column_push($columns)
	{
		if ($columns == '*')
		{
			return $columns;
		}

		if (is_string($columns))
		{
			$columns = array($columns);
		}

		$stack = array();

		foreach ($columns as $key => $value)
		{
			preg_match('/([a-zA-Z0-9_\-\.]*)\s*\(([a-zA-Z0-9_\-]*)\)/i', $value, $match);

			if (isset($match[1], $match[2]))
			{
				array_push($stack, $this->column_quote( $match[1] ) . ' AS ' . $this->column_quote( $match[2] ));
			}
			else
			{
				array_push($stack, $this->column_quote( $value ));
			}
		}

		return implode($stack, ',');
	}

	protected function array_quote($array)
	{
		$temp = array();

		foreach ($array as $value)
		{
			$temp[] = is_int($value) ? $value : $this->pdo->quote($value);
		}

		return implode($temp, ',');
	}

	protected function inner_conjunct($data, $conjunctor, $outer_conjunctor)
	{
		$haystack = array();

		foreach ($data as $value)
		{
			$haystack[] = '(' . $this->data_implode($value, $conjunctor) . ')';
		}

		return implode($outer_conjunctor . ' ', $haystack);
	}

	protected function fn_quote($column, $string)
	{
		return (strpos($column, '#') === 0 && preg_match('/^[A-Z0-9\_]*\([^)]*\)$/', $string)) ?

			$string :

			$this->quote($string);
	}

	protected function data_implode($data, $conjunctor, $outer_conjunctor = null)
	{
		$wheres = array();

		foreach ($data as $key => $value)
		{
			$type = gettype($value);

			if (
				preg_match("/^(AND|OR)\s*#?/i", $key, $relation_match) &&
				$type == 'array'
			)
			{
				$wheres[] = 0 !== count(array_diff_key($value, array_keys(array_keys($value)))) ?
					'(' . $this->data_implode($value, ' ' . $relation_match[1]) . ')' :
					'(' . $this->inner_conjunct($value, ' ' . $relation_match[1], $conjunctor) . ')';
			}
			else
			{
				preg_match('/(#?)([\w\.]+)(\[(\>|\>\=|\<|\<\=|\!|\<\>|\>\<|\!?~)\])?/i', $key, $match);
				$column = $this->column_quote($match[2]);

				if (isset($match[4]))
				{
					$operator = $match[4];

					if ($operator == '!')
					{
						switch ($type)
						{
							case 'NULL':
								$wheres[] = $column . ' IS NOT NULL';
								break;

							case 'array':
								$wheres[] = $column . ' NOT IN (' . $this->array_quote($value) . ')';
								break;

							case 'integer':
							case 'double':
								$wheres[] = $column . ' != ' . $value;
								break;

							case 'boolean':
								$wheres[] = $column . ' != ' . ($value ? '1' : '0');
								break;

							case 'string':
								$wheres[] = $column . ' != ' . $this->fn_quote($key, $value);
								break;
						}
					}

					if ($operator == '<>' || $operator == '><')
					{
						if ($type == 'array')
						{
							if ($operator == '><')
							{
								$column .= ' NOT';
							}

							if (is_numeric($value[0]) && is_numeric($value[1]))
							{
								$wheres[] = '(' . $column . ' BETWEEN ' . $value[0] . ' AND ' . $value[1] . ')';
							}
							else
							{
								$wheres[] = '(' . $column . ' BETWEEN ' . $this->quote($value[0]) . ' AND ' . $this->quote($value[1]) . ')';
							}
						}
					}

					if ($operator == '~' || $operator == '!~')
					{
						if ($type == 'string')
						{
							$value = array($value);
						}

						if (!empty($value))
						{
							$like_clauses = array();

							foreach ($value as $item)
							{
								if ($operator == '!~')
								{
									$column .= ' NOT';
								}

								if (preg_match('/^(?!%).+(?<!%)$/', $item))
								{
									$item = '%' . $item . '%';
								}

								$like_clauses[] = $column . ' LIKE ' . $this->fn_quote($key, $item);
							}

							$wheres[] = implode(' OR ', $like_clauses);
						}
					}

					if (in_array($operator, array('>', '>=', '<', '<=')))
					{
						if (is_numeric($value))
						{
							$wheres[] = $column . ' ' . $operator . ' ' . $value;
						}
						elseif (strpos($key, '#') === 0)
						{
							$wheres[] = $column . ' ' . $operator . ' ' . $this->fn_quote($key, $value);
						}
						else
						{
							$wheres[] = $column . ' ' . $operator . ' ' . $this->quote($value);
						}
					}
				}
				else
				{
					switch ($type)
					{
						case 'NULL':
							$wheres[] = $column . ' IS NULL';
							break;

						case 'array':
							$wheres[] = $column . ' IN (' . $this->array_quote($value) . ')';
							break;

						case 'integer':
						case 'double':
							$wheres[] = $column . ' = ' . $value;
							break;

						case 'boolean':
							$wheres[] = $column . ' = ' . ($value ? '1' : '0');
							break;

						case 'string':
							$wheres[] = $column . ' = ' . $this->fn_quote($key, $value);
							break;
					}
				}
			}
		}

		return implode($conjunctor . ' ', $wheres);
	}

	protected function where_clause($where)
	{
		$where_clause = '';

		if (is_array($where))
		{
			$where_keys = array_keys($where);
			$where_AND = preg_grep("/^AND\s*#?$/i", $where_keys);
			$where_OR = preg_grep("/^OR\s*#?$/i", $where_keys);

			$single_condition = array_diff_key($where, array_flip(
				explode(' ', 'AND OR GROUP ORDER HAVING LIMIT LIKE MATCH')
			));

			if ($single_condition != array())
			{
				$where_clause = ' WHERE ' . $this->data_implode($single_condition, '');
			}

			if (!empty($where_AND))
			{
				$value = array_values($where_AND);
				$where_clause = ' WHERE ' . $this->data_implode($where[ $value[0] ], ' AND');
			}

			if (!empty($where_OR))
			{
				$value = array_values($where_OR);
				$where_clause = ' WHERE ' . $this->data_implode($where[ $value[0] ], ' OR');
			}

			if (isset($where['MATCH']))
			{
				$MATCH = $where['MATCH'];

				if (is_array($MATCH) && isset($MATCH['columns'], $MATCH['keyword']))
				{
					$where_clause .= ($where_clause != '' ? ' AND ' : ' WHERE ') . ' MATCH ("' . str_replace('.', '"."', implode($MATCH['columns'], '", "')) . '") AGAINST (' . $this->quote($MATCH['keyword']) . ')';
				}
			}

			if (isset($where['GROUP']))
			{
				$where_clause .= ' GROUP BY ' . $this->column_quote($where['GROUP']);

				if (isset($where['HAVING']))
				{
					$where_clause .= ' HAVING ' . $this->data_implode($where['HAVING'], ' AND');
				}
			}

			if (isset($where['ORDER']))
			{
				$rsort = '/(^[a-zA-Z0-9_\-\.]*)(\s*(DESC|ASC))?/';
				$ORDER = $where['ORDER'];

				if (is_array($ORDER))
				{
					if (
						isset($ORDER[1]) &&
						is_array($ORDER[1])
					)
					{
						$where_clause .= ' ORDER BY FIELD(' . $this->column_quote($ORDER[0]) . ', ' . $this->array_quote($ORDER[1]) . ')';
					}
					else
					{
						$stack = array();

						foreach ($ORDER as $column)
						{
							preg_match($rsort, $column, $order_match);

							array_push($stack, '"' . str_replace('.', '"."', $order_match[1]) . '"' . (isset($order_match[3]) ? ' ' . $order_match[3] : ''));
						}

						$where_clause .= ' ORDER BY ' . implode($stack, ',');
					}
				}
				else
				{
					preg_match($rsort, $ORDER, $order_match);

					$where_clause .= ' ORDER BY "' . str_replace('.', '"."', $order_match[1]) . '"' . (isset($order_match[3]) ? ' ' . $order_match[3] : '');
				}
			}

			if (isset($where['LIMIT']))
			{
				$LIMIT = $where['LIMIT'];

				if (is_numeric($LIMIT))
				{
					$where_clause .= ' LIMIT ' . $LIMIT;
				}

				if (
					is_array($LIMIT) &&
					is_numeric($LIMIT[0]) &&
					is_numeric($LIMIT[1])
				)
				{
					$where_clause .= ' LIMIT ' . $LIMIT[0] . ',' . $LIMIT[1];
				}
			}
		}
		else
		{
			if ($where != null)
			{
				$where_clause .= ' ' . $where;
			}
		}

		return $where_clause;
	}

	protected function select_context($table, $join, &$columns = null, $where = null, $column_fn = null)
	{
		$table = '"' . $table . '"';
		$join_key = is_array($join) ? array_keys($join) : null;

		if (
			isset($join_key[0]) &&
			strpos($join_key[0], '[') === 0
		)
		{
			$table_join = array();

			$join_array = array(
				'>' => 'LEFT',
				'<' => 'RIGHT',
				'<>' => 'FULL',
				'><' => 'INNER'
			);

			foreach($join as $sub_table => $relation)
			{
				preg_match('/(\[(\<|\>|\>\<|\<\>)\])?([a-zA-Z0-9_\-]*)\s?(\(([a-zA-Z0-9_\-]*)\))?/', $sub_table, $match);

				if ($match[2] != '' && $match[3] != '')
				{
					if (is_string($relation))
					{
						$relation = 'USING ("' . $relation . '")';
					}

					if (is_array($relation))
					{
						// For ['column1', 'column2']
						if (isset($relation[0]))
						{
							$relation = 'USING ("' . implode($relation, '", "') . '")';
						}
						// For ['column1' => 'column2']
						else
						{
							$relation = 'ON ' . $table . '."' . key($relation) . '" = "' . (isset($match[5]) ? $match[5] : $match[3]) . '"."' . current($relation) . '"';
						}
					}

					$table_join[] = $join_array[ $match[2] ] . ' JOIN "' . $match[3] . '" ' . (isset($match[5]) ?  'AS "' . $match[5] . '" ' : '') . $relation;
				}
			}

			$table .= ' ' . implode($table_join, ' ');
		}
		else
		{
			if (is_null($columns))
			{
				if (is_null($where))
				{
					if (
						is_array($join) &&
						isset($column_fn)
					)
					{
						$where = $join;
						$columns = null;
					}
					else
					{
						$where = null;
						$columns = $join;
					}
				}
				else
				{
					$where = $join;
					$columns = null;
				}
			}
			else
			{
				$where = $columns;
				$columns = $join;
			}
		}

		if (isset($column_fn))
		{
			if ($column_fn == 1)
			{
				$column = '1';

				if (is_null($where))
				{
					$where = $columns;
				}
			}
			else
			{
				if (empty($columns))
				{
					$columns = '*';
					$where = $join;
				}

				$column = $column_fn . '(' . $this->column_push($columns) . ')';
			}
		}
		else
		{
			$column = $this->column_push($columns);
		}

		return 'SELECT ' . $column . ' FROM ' . $table . $this->where_clause($where);
	}

	public function select($table, $join, $columns = null, $where = null)
	{
		$query = $this->query($this->select_context($table, $join, $columns, $where));

		return $query ? $query->fetchAll(
			(is_string($columns) && $columns != '*') ? PDO::FETCH_COLUMN : PDO::FETCH_ASSOC
		) : false;
	}

	public function insert($table, $datas)
	{
		$lastId = array();

		// Check indexed or associative array
		if (!isset($datas[0]))
		{
			$datas = array($datas);
		}

		foreach ($datas as $data)
		{
			$keys = array_keys($data);
			$values = array();
			$columns = array();

			foreach ($data as $key => $value)
			{
				array_push($columns, $this->column_quote($key));

				switch (gettype($value))
				{
					case 'NULL':
						$values[] = 'NULL';
						break;

					case 'array':
						preg_match("/\(JSON\)\s*([\w]+)/i", $key, $column_match);

						$values[] = isset($column_match[0]) ?
							$this->quote(json_encode($value)) :
							$this->quote(serialize($value));
						break;

					case 'boolean':
						$values[] = ($value ? '1' : '0');
						break;

					case 'integer':
					case 'double':
					case 'string':
						$values[] = $this->fn_quote($key, $value);
						break;
				}
			}

			$this->exec('INSERT INTO "' . $table . '" (' . implode(', ', $columns) . ') VALUES (' . implode($values, ', ') . ')');

			$lastId[] = $this->pdo->lastInsertId();
		}

		return count($lastId) > 1 ? $lastId : $lastId[ 0 ];
	}

	public function update($table, $data, $where = null)
	{
		$fields = array();

		foreach ($data as $key => $value)
		{
			preg_match('/([\w]+)(\[(\+|\-|\*|\/)\])?/i', $key, $match);

			if (isset($match[3]))
			{
				if (is_numeric($value))
				{
					$fields[] = $this->column_quote($match[1]) . ' = ' . $this->column_quote($match[1]) . ' ' . $match[3] . ' ' . $value;
				}
			}
			else
			{
				$column = $this->column_quote($key);

				switch (gettype($value))
				{
					case 'NULL':
						$fields[] = $column . ' = NULL';
						break;

					case 'array':
						preg_match("/\(JSON\)\s*([\w]+)/i", $key, $column_match);

						$fields[] = $column . ' = ' . $this->quote(
								isset($column_match[0]) ? json_encode($value) : serialize($value)
							);
						break;

					case 'boolean':
						$fields[] = $column . ' = ' . ($value ? '1' : '0');
						break;

					case 'integer':
					case 'double':
					case 'string':
						$fields[] = $column . ' = ' . $this->fn_quote($key, $value);
						break;
				}
			}
		}

		return $this->exec('UPDATE "' . $table . '" SET ' . implode(', ', $fields) . $this->where_clause($where));
	}

	public function delete($table, $where)
	{
		return $this->exec('DELETE FROM "' . $table . '"' . $this->where_clause($where));
	}

	public function replace($table, $columns, $search = null, $replace = null, $where = null)
	{
		if (is_array($columns))
		{
			$replace_query = array();

			foreach ($columns as $column => $replacements)
			{
				foreach ($replacements as $replace_search => $replace_replacement)
				{
					$replace_query[] = $column . ' = REPLACE(' . $this->column_quote($column) . ', ' . $this->quote($replace_search) . ', ' . $this->quote($replace_replacement) . ')';
				}
			}

			$replace_query = implode(', ', $replace_query);
			$where = $search;
		}
		else
		{
			if (is_array($search))
			{
				$replace_query = array();

				foreach ($search as $replace_search => $replace_replacement)
				{
					$replace_query[] = $columns . ' = REPLACE(' . $this->column_quote($columns) . ', ' . $this->quote($replace_search) . ', ' . $this->quote($replace_replacement) . ')';
				}

				$replace_query = implode(', ', $replace_query);
				$where = $replace;
			}
			else
			{
				$replace_query = $columns . ' = REPLACE(' . $this->column_quote($columns) . ', ' . $this->quote($search) . ', ' . $this->quote($replace) . ')';
			}
		}

		return $this->exec('UPDATE "' . $table . '" SET ' . $replace_query . $this->where_clause($where));
	}

	public function get($table, $join = null, $column = null, $where = null)
	{
		if (!isset($where))
		{
			$where = array();
		}

		$where['LIMIT'] = 1;

		$query = $this->query($this->select_context($table, $join, $column, $where));

		if ($query)
		{
			$data = $query->fetchAll(PDO::FETCH_ASSOC);

			if (isset($data[0]))
			{
				$column = $where == null ? $join : $column;

				if (is_string($column) && $column != '*')
				{
					return $data[ 0 ][ $column ];
				}

				return $data[ 0 ];
			}
			else
			{
				return false;
			}
		}
		else
		{
			return false;
		}
	}

	public function has($table, $join, $where = null)
	{
		$column = null;

		$query = $this->query('SELECT EXISTS(' . $this->select_context($table, $join, $column, $where, 1) . ')');

		return $query ? $query->fetchColumn() === '1' : false;
	}

	public function count($table, $join = null, $column = null, $where = null)
	{
		$query = $this->query($this->select_context($table, $join, $column, $where, 'COUNT'));

		return $query ? 0 + $query->fetchColumn() : false;
	}

	public function max($table, $join, $column = null, $where = null)
	{
		$query = $this->query($this->select_context($table, $join, $column, $where, 'MAX'));

		if ($query)
		{
			$max = $query->fetchColumn();

			return is_numeric($max) ? $max + 0 : $max;
		}
		else
		{
			return false;
		}
	}

	public function min($table, $join, $column = null, $where = null)
	{
		$query = $this->query($this->select_context($table, $join, $column, $where, 'MIN'));

		if ($query)
		{
			$min = $query->fetchColumn();

			return is_numeric($min) ? $min + 0 : $min;
		}
		else
		{
			return false;
		}
	}

	public function avg($table, $join, $column = null, $where = null)
	{
		$query = $this->query($this->select_context($table, $join, $column, $where, 'AVG'));

		return $query ? 0 + $query->fetchColumn() : false;
	}

	public function sum($table, $join, $column = null, $where = null)
	{
		$query = $this->query($this->select_context($table, $join, $column, $where, 'SUM'));

		return $query ? 0 + $query->fetchColumn() : false;
	}

	public function debug()
	{
		$this->debug_mode = true;

		return $this;
	}

	public function error()
	{
		return $this->pdo->errorInfo();
	}

	public function last_query()
	{
		return end($this->logs);
	}

	public function log()
	{
		return $this->logs;
	}

	public function info()
	{
		$output = array(
			'server' => 'SERVER_INFO',
			'driver' => 'DRIVER_NAME',
			'client' => 'CLIENT_VERSION',
			'version' => 'SERVER_VERSION',
			'connection' => 'CONNECTION_STATUS'
		);

		foreach ($output as $key => $value)
		{
			$output[ $key ] = $this->pdo->getAttribute(constant('PDO::ATTR_' . $value));
		}

		return $output;
	}
}
?>