<?php

namespace KarmaFW\Database\Sql;


class SqlQuery
{
	protected $db;
	protected $duration = null;
	protected $error = null;
	protected $recordset = null;
	protected $status = 'ready';
	protected $query = null;
	protected $results_rows_count = null;
	protected $affected_rows_count = null;

	public function __construct($db, $query=null)
	{
		$this->db = $db;
		$this->query = $query;
	}


	public function __toString()
	{
		return $this->getQuery();
	}


    public function __debugInfo() {
        return [
            //'db:protected' => get_class($this->db) ." Object",
            'db:protected' => $this->db,
            'status:protected' => $this->status,
            'error:protected' => $this->error,
            'query:protected' => $this->query,
            'duration:protected' => $this->duration,
            //'recordset:protected' => get_class($this->recordset) ." Object",
            'recordset:protected' => $this->recordset,
            'results_rows_count:protected' => $this->results_rows_count,
            'affected_rows_count:protected' => $this->affected_rows_count,
        ];
    }


	public function fetchColumn($column_name)
	{
		if ($this->status == 'ready') {
			$this->execute();
		}
		return $this->recordset->fetchColumn($column_name);
	}


	public function fetchOne()
	{
		if ($this->status == 'ready') {
			$this->execute();
		}
		return $this->recordset->fetchOne();
	}


	public function fetchAll()
	{
		if ($this->status == 'ready') {
			$this->execute();
		}
		return $this->recordset->fetchAll();
	}


	public function getQuery()
	{
		return $this->query;
	}


	public function getStatus()
	{
		return $this->status;
	}


	public function execute($query=null, $params=[])
	{
		if (empty($query)) {
			$query = $this->query;
		}

		if (! empty($params)) {
			$parts = explode('?', $query);

			$query = array_shift($parts);
			$i = 1;
			foreach ($params as $param) {
				if (empty($parts)) {
					throw new \Exception('SqlQuery::execute() => params error (1) [QUERY: ' . preg_replace('/\s+/', ' ', $query) . ' ]');
				}
				$param = $this->db->escape($param);
				$query .= $param;
				$query .= array_shift($parts);
				$i++;
			}
			if (! empty($parts)) {
				throw new \Exception('SqlQuery::execute() => params error (2) [QUERY: ' . preg_replace('/\s+/', ' ', $query) . ' ]');
			}
		}

		$this->query = preg_replace('/\s+/', ' ', $query);

		$this->status = 'running';
		$ts_start = microtime(true);

		//echo $query . "<hr />";
		$rs = $this->db->getDriver()->execute($query);
		//pre($rs);

		$ts_end = microtime(true);
		$this->duration = $ts_end - $ts_start;
		
		$this->recordset = $rs;
		$this->db->setLastQuery($this);

		$error_code = $this->db->getDriver()->getConn()->errno;
	
		if ($error_code !== 0) {
			// query error
			$error_msg = $this->db->getDriver()->getConn()->error;
			$this->error = $error_msg;
			$this->status = 'error';

			if ($this->db->throwOnSqlError) {
				throw new \Exception('SqlQuery::execute() => DB error [' . $error_code . '] : ' . $error_msg . PHP_EOL . '[QUERY: ' . preg_replace('/\s+/', ' ', $query) . ' ]');
			}
			//return null;
		
		} else {
			$this->status = 'success';
		}

		$this->results_rows_count = $rs->getRowsCount();
		$this->affected_rows_count = $this->db->getDriver()->getAffectedRowsCount();

		if (strpos($query, "SQL_CALC_FOUND_ROWS")) {
	        $found_rows = $this->execute('SELECT FOUND_ROWS() AS found_rows')->oneField('found_rows');
		} else {
			$found_rows = null;
		}


		return $this;
	}

	
	public function executeSelect($query, $params=[])
	{
		// Alias of executeSelectAll
		return $this->executeSelectAll($query, $params);
	}

	public function executeSelectOne($query, $params=[])
	{
		return $this->execute($query, $params)->fetchOne();
	}

	public function executeSelectAll($query, $params=[])
	{
		return $this->execute($query, $params)->fetchAll();
	}


	public function executeInsert($query, $params=[])
	{
		$this->execute($query, $params);
		return $this->insert_id();
	}
	

	public function executeInsertAll($query, $params=[])
	{
		return $this->execute($query, $params);
	}


	public function executeUpdate($query, $params=[])
	{
		$this->execute($query, $params);
		return $this->affected_rows_count;
	}


	public function executeDelete($query, $params=[])
	{
		$this->execute($query, $params);
		return $this->affected_rows_count;
	}


	/* ### */


	public function tableSelect($table_name, $where=[], $options=[])
	{
		// Alias of tableSelectAll
		return $this->tableSelectAll($table_name, $where, $options)->all();
	}

	public function tableSelectAll($table_name, $where=[], $options=[])
	{
		$table = new SqlTable($this->db, $table_name);
		$query = $table->buildQuery($where, $options);
		return $this->executeSelectAll($query);
	}

	public function tableSelectOne($table_name, $where=[], $options=[])
	{
		if (empty($options)) {
			$options = [];
		}
		$options['limit'] = 1;

		return $this->tableSelect($table_name, $where, $options)->one();
	}


	public function tableInsert($table_name, $values=[], $options=[])
	{
		$this->tableInsertAll($table_name, [$values], $options);
		return $this->db->getInsertId();
	}


	public function tableInsertAll($table_name, $inserts=[], $options=[])
	{
		$table = new SqlTable($this->db, $table_name);
		return $table->insertAll($inserts, $options);		
	}


	public function tableUpdate($table_name, $updates=[], $where=[], $options=[])
	{
		$table = new SqlTable($this->db, $table_name);
		return $table->update($updates, $where, $options);
	}


	public function tableDelete($table_name, $where=[], $options=[])
	{
		$table = new SqlTable($this->db, $table_name);
		return $table->delete($where, $options);
	}

}