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class MongoExportHelper {
    private $path = './';
    private $database = 'default';

    public function setPath($path) {
        $this->path = $path;
    }

    public function setDatabase($database) {
        $this->database = $database;
    }

    /**
     * Export by DBRef
     * mongoexport --db <database> --collection <collection> --query '{"owner": DBRef("<name>", ObjectId("<id>"))}"' >> <path><collection>.json
     *
     * @param $collection
     * @param $ref
     * @param $name
     * @param $id
     * @author Israel Sotomayor
     */
    public function exportDBRef($collection, $ref, $name, $id) {
        $query = ' --query \'{"' . $ref . '": DBRef("' . $name . '", ObjectId("' . (string) $id . '"))}"\'';
        $this->run($collection, $query);
    }

    /**
     * Export by referenced code
     * mongoexport --db <database> --collection <collection> --query '{"<ref>": ObjectId("<id>")}"' >> <path><collection>.json
     *
     * @param $collection
     * @param $ref
     * @param $id
     * @author Israel Sootmayor
     */
    public function exportObjectId($collection, $ref, $id) {
        $query = ' --query \'{"' . $ref . '": ObjectId("' . (string) $id . '")}"\'';
        $this->run($collection, $query);
    }

    /**
     * Export by _id
     * mongoexport --db <database> --collection <collection> --query '{"_id": ObjectId("<id>")}"' >> <path><collection>.json
     *
     * @param $collection
     * @param $id
     * @author Israel Sotomayor
     */
    public function exportId($collection, $id) {
        $this->exportObjectId($collection, '_id', $id);
    }

    /**
     * Export the whole collection
     * mongoexport --db <database> --collection <collection> >> <path><collection>.json
     *
     * @param $collection
     * @author Israel Sotomayor
     */
    public function export($collection) {
        $this->run($collection);
    }

    /**
     * Delete all json files on the default (the script location) or specified path
     *
     * @author Israel Sotomayor
     */
    public function deleteExportFiles() {
        $command = 'rm ' . $this->path . '*.json';
        exec($command);
    }

    /**
     * Run the mongoexport command and show what is running on the command line
     *
     * @param $collection
     * @param null $query
     * @author Israel Sotomayor
     */
    private function run($collection, $query = null) {
        $mongoExport = 'mongoexport --db ' . $this->database . ' --collection ';
        $out = ' >> ' . $this->path . $collection . '.json';

        $command = isset($query) ? $mongoExport . $collection . $query . $out : $mongoExport . $collection . $out;

        echo $command . "\r\n";
        exec($command);
    }
}