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<?php

    namespace CzProject\SqlGenerator;


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


        /**
         * @return static
         */
        public function addStatement(IStatement $statement)
        {
            $this->statements[] = $statement;
            return $this;
        }


        /**
         * @return bool
         */
        public function isEmpty()
        {
            return empty($this->statements);
        }


        /**
         * @return string[]
         */
        public function getSqlQueries(IDriver $driver)
        {
            $output = array();

            foreach ($this->statements as $statement) {
                $output[] = $statement->toSql($driver);
            }

            return $output;
        }


        /**
         * @return string
         */
        public function toSql(IDriver $driver)
        {
            $output = '';
            $first = TRUE;

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

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

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

            return $output;
        }


        /**
         * @param  string
         * @param  IDriver
         * @return void
         * @throws IOException
         */
        public function save($file, IDriver $driver)
        {
            // create directory
            $dir = dirname($file);

            if (!is_dir($dir) && !@mkdir($dir, 0777, TRUE) && !is_dir($dir)) { // @ - dir may already exist
                throw new IOException("Unable to create directory '$dir'.");
            }

            // write file
            $content = $this->toSql($driver);

            if (@file_put_contents($file, $content) === FALSE) { // @ is escalated to exception
                throw new IOException("Unable to write file '$file'.");
            }
        }


        /**
         * @param  string
         * @param  array
         * @return Statements\Insert
         */
        public function insert($tableName, array $data)
        {
            $statement = new Statements\Insert($tableName, $data);
            $this->addStatement($statement);
            return $statement;
        }


        /**
         * @param  string
         * @return Statements\CreateTable
         */
        public function createTable($tableName)
        {
            $statement = new Statements\CreateTable($tableName);
            $this->addStatement($statement);
            return $statement;
        }


        /**
         * @param  string
         * @return Statements\DropTable
         */
        public function dropTable($tableName)
        {
            $statement = new Statements\DropTable($tableName);
            $this->addStatement($statement);
            return $statement;
        }


        /**
         * @param  string
         * @param  string
         * @return Statements\RenameTable
         */
        public function renameTable($oldTable, $newTable)
        {
            $statement = new Statements\RenameTable($oldTable, $newTable);
            $this->addStatement($statement);
            return $statement;
        }


        /**
         * @param  string
         * @return Statements\AlterTable
         */
        public function alterTable($tableName)
        {
            $statement = new Statements\AlterTable($tableName);
            $this->addStatement($statement);
            return $statement;
        }


        /**
         * @param  string
         * @return Statements\SqlCommand
         */
        public function command($command)
        {
            $statement = new Statements\SqlCommand($command);
            $this->addStatement($statement);
            return $statement;
        }


        /**
         * @param  string
         * @return Statements\Comment
         */
        public function comment($comment)
        {
            $statement = new Statements\Comment($comment);
            $this->addStatement($statement);
            return $statement;
        }
    }