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<?php

    namespace CzProject\SqlGenerator\Statements;

    use CzProject\SqlGenerator\DuplicateException;
    use CzProject\SqlGenerator\Helpers;
    use CzProject\SqlGenerator\IDriver;
    use CzProject\SqlGenerator\IStatement;


    class AlterTable implements IStatement
    {
        /** @var string */
        private $tableName;

        /** @var IStatement[] */
        private $statements = array();

        /** @var string|NULL */
        private $comment;

        /** @var array  [name => value] */
        private $options = array();


        /**
         * @param  string
         */
        public function __construct($tableName)
        {
            $this->tableName = $tableName;
        }


        /**
         * @param  string
         * @param  string
         * @param  array
         * @param  array  [name => value]
         * @return AddColumn
         */
        public function addColumn($name, $type, array $parameters = NULL, array $options = array())
        {
            return $this->statements[] = new AddColumn($name, $type, $parameters, $options);
        }


        /**
         * @param  string
         * @return DropColumn
         */
        public function dropColumn($column)
        {
            return $this->statements[] = new DropColumn($column);
        }


        /**
         * @param  string
         * @param  string
         * @param  array
         * @param  array  [name => value]
         * @return ModifyColumn
         */
        public function modifyColumn($name, $type, array $parameters = NULL, array $options = array())
        {
            return $this->statements[] = new ModifyColumn($name, $type, $parameters, $options);
        }


        /**
         * @param  string|NULL
         * @param  string
         * @return AddIndex
         */
        public function addIndex($name = NULL, $type)
        {
            return $this->statements[] = new AddIndex($name, $type);
        }


        /**
         * @param  string|NULL
         * @return DropIndex
         */
        public function dropIndex($index)
        {
            return $this->statements[] = new DropIndex($index);
        }


        /**
         * @param  string
         * @param  string[]|string
         * @param  string
         * @param  string[]|string
         * @return AddForeignKey
         */
        public function addForeignKey($name, $columns = array(), $targetTable, $targetColumns = array())
        {
            return $this->statements[] = new AddForeignKey($name, $columns, $targetTable, $targetColumns);
        }


        /**
         * @param  string
         * @return DropForeignKey
         */
        public function dropForeignKey($foreignKey)
        {
            return $this->statements[] = new DropForeignKey($foreignKey);
        }


        /**
         * @param  string|NULL
         * @return static
         */
        public function setComment($comment)
        {
            $this->comment = $comment;
            return $this;
        }


        /**
         * @param  string
         * @param  string
         * @return static
         */
        public function setOption($name, $value)
        {
            $this->options[$name] = $value;
            return $this;
        }


        /**
         * @return string
         */
        public function toSql(IDriver $driver)
        {
            if (empty($this->statements) && empty($this->options) && !isset($this->comment)) {
                return '';
            }

            $output = 'ALTER TABLE ' . $driver->escapeIdentifier($this->tableName) . "\n";
            $isFirst = TRUE;

            foreach ($this->statements as $statement) {
                if ($isFirst) {
                    $isFirst = FALSE;

                } else {
                    $output .= ",\n";
                }

                $output .= $statement->toSql($driver);
            }

            if (isset($this->comment)) {
                if ($isFirst) {
                    $isFirst = FALSE;

                } else {
                    $output .= ",\n";
                }

                $output .= 'COMMENT ' . $driver->escapeText($this->comment);
            }

            foreach ($this->options as $optionName => $optionValue) {
                if ($isFirst) {
                    $isFirst = FALSE;

                } else {
                    $output .= ",\n";
                }

                $output .= $optionName . '=' . $optionValue;
            }

            $output .= ';';
            return $output;
        }
    }