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<?php

    namespace CzProject\SqlSchema;


    class Index
    {
        const TYPE_INDEX = 'INDEX';
        const TYPE_PRIMARY = 'PRIMARY';
        const TYPE_UNIQUE = 'UNIQUE';
        const TYPE_FULLTEXT = 'FULLTEXT';

        /** @var string */
        private $name;

        /** @var string */
        private $type;

        /** @var IndexColumn[] */
        private $columns = array();


        /**
         * @param  string|NULL
         * @param  string
         * @param  string[]|string
         */
        public function __construct($name, $type = self::TYPE_INDEX, $columns = array())
        {
            $this->name = $name;
            $this->setType($type);

            if (!is_array($columns)) {
                $columns = array($columns);
            }

            foreach ($columns as $column) {
                $this->addColumn($column);
            }
        }


        /**
         * @return string|NULL
         */
        public function getName()
        {
            return $this->name;
        }


        /**
         * @param  string
         * @return self
         */
        public function setType($type)
        {
            $type = (string) $type;
            $exists = $type === self::TYPE_INDEX
                || $type === self::TYPE_PRIMARY
                || $type === self::TYPE_UNIQUE
                || $type === self::TYPE_FULLTEXT;

            if (!$exists) {
                throw new OutOfRangeException("Index type '$type' not found.");
            }

            $this->type = $type;
            return $this;
        }


        /**
         * @return string
         */
        public function getType()
        {
            return $this->type;
        }


        /**
         * @param  IndexColumn|string
         * @return IndexColumn
         */
        public function addColumn($column)
        {
            if (!($column instanceof IndexColumn)) {
                $column = new IndexColumn($column);
            }

            return $this->columns[] = $column;
        }


        /**
         * @return IndexColumn[]
         */
        public function getColumns()
        {
            return $this->columns;
        }
    }