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<?php

    namespace Inlm\SchemaGenerator\Utils;

    use CzProject\SqlSchema;


    class GeneratorIndex
    {
        /** @var string */
        private $tableName;

        /** @var SqlSchema\Index */
        private $definition;


        /**
         * @param  string
         * @param  SqlSchema\Index
         */
        public function __construct($tableName, SqlSchema\Index $definition)
        {
            $this->tableName = $tableName;
            $this->definition = $definition;
        }


        /**
         * @return SqlSchema\Index
         */
        public function getDefinition()
        {
            return $this->definition;
        }


        /**
         * @param  string
         * @param  string|string[]
         * @return void
         * @throws \Inlm\SchemaGenerator\IncompatibleException
         */
        public function checkCompatibility($type, $columns)
        {
            $indexName = $this->definition->getName();

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

            $origType = $this->definition->getType();

            if ($origType !== $type) {
                throw new \Inlm\SchemaGenerator\IncompatibleException("Type mismatch for index '$indexName' in table '{$this->tableName}'. Original type '$origType', new type '$type'.");
            }

            $origColumns = array();

            foreach ($this->definition->getColumns() as $column) {
                $origColumns[] = $column->getName();
            }

            if ($origColumns !== $columns) {
                throw new \Inlm\SchemaGenerator\IncompatibleException("Mismatched columns for index '$indexName' in table '{$this->tableName}'. Original columns (" . implode(', ', $origColumns) . "), new columns (" . implode(', ', $columns) . ").");
            }
        }
    }