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<?php

namespace IlluminateDatabaseSchemaGrammars;

use DoctrineDBALSchemaAbstractSchemaManager as SchemaManager;
use DoctrineDBALSchemaColumn;
use DoctrineDBALSchemaTableDiff;
use IlluminateDatabaseConnection;
use IlluminateDatabaseSchemaBlueprint;
use IlluminateSupportFluent;

class RenameColumn
{
    /**
     * Compile a rename column command.
     *
     * @param  IlluminateDatabaseSchemaGrammarsGrammar  $grammar
     * @param  IlluminateDatabaseSchemaBlueprint  $blueprint
     * @param  IlluminateSupportFluent  $command
     * @param  IlluminateDatabaseConnection  $connection
     * @return array
     */
    public static function compile(Grammar $grammar, Blueprint $blueprint, Fluent $command, Connection $connection)
    {
        $schema = $connection->getDoctrineSchemaManager();
        $databasePlatform = $connection->getDoctrineConnection()->getDatabasePlatform();
        $databasePlatform->registerDoctrineTypeMapping('enum', 'string');

        $column = $connection->getDoctrineColumn(
            $grammar->getTablePrefix().$blueprint->getTable(), $command->from
        );

        return (array) $databasePlatform->getAlterTableSQL(static::getRenamedDiff(
            $grammar, $blueprint, $command, $column, $schema
        ));
    }

    /**
     * Get a new column instance with the new column name.
     *
     * @param  IlluminateDatabaseSchemaGrammarsGrammar  $grammar
     * @param  IlluminateDatabaseSchemaBlueprint  $blueprint
     * @param  IlluminateSupportFluent  $command
     * @param  DoctrineDBALSchemaColumn  $column
     * @param  DoctrineDBALSchemaAbstractSchemaManager  $schema
     * @return DoctrineDBALSchemaTableDiff
     */
    protected static function getRenamedDiff(Grammar $grammar, Blueprint $blueprint, Fluent $command, Column $column, SchemaManager $schema)
    {
        return static::setRenamedColumns(
            $grammar->getDoctrineTableDiff($blueprint, $schema), $command, $column
        );
    }

    /**
     * Set the renamed columns on the table diff.
     *
     * @param  DoctrineDBALSchemaTableDiff  $tableDiff
     * @param  IlluminateSupportFluent  $command
     * @param  DoctrineDBALSchemaColumn  $column
     * @return DoctrineDBALSchemaTableDiff
     */
    protected static function setRenamedColumns(TableDiff $tableDiff, Fluent $command, Column $column)
    {
        $tableDiff->renamedColumns = [
            $command->from => new Column($command->to, $column->getType(), self::getWritableColumnOptions($column)),
        ];

        return $tableDiff;
    }

    /**
     * Get the writable column options.
     *
     * @param  DoctrineDBALSchemaColumn  $column
     * @return array
     */
    private static function getWritableColumnOptions(Column $column)
    {
        return array_filter($column->toArray(), function (string $name) use ($column) {
            return method_exists($column, 'set'.$name);
        }, ARRAY_FILTER_USE_KEY);
    }
}