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<?php

    namespace CzProject\SqlGenerator\Statements;

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


    class ColumnDefinition implements IStatement
    {
        /** @var string */
        private $name;

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

        /** @var array */
        private $parameters = array();

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

        /** @var bool */
        private $nullable = FALSE;

        /** @var scalar|NULL */
        private $defaultValue;

        /** @var bool */
        private $autoIncrement = FALSE;

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


        /**
         * @param  string
         * @param  string
         * @param  array
         * @param  array  [name => value]
         */
        public function __construct($name, $type, array $parameters = NULL, array $options = array())
        {
            $this->name = $name;
            $this->type = $type;
            $this->parameters = ($parameters !== NULL) ? $parameters : array();
            $this->options = $options;
        }


        /**
         * @param  bool
         * @return static
         */
        public function setNullable($nullable = TRUE)
        {
            $this->nullable = $nullable;
            return $this;
        }


        /**
         * @param  scalar|NULL
         * @return static
         */
        public function setDefaultValue($defaultValue)
        {
            $this->defaultValue = $defaultValue;
            return $this;
        }


        /**
         * @param  bool
         * @return static
         */
        public function setAutoIncrement($autoIncrement = TRUE)
        {
            $this->autoIncrement = $autoIncrement;
            return $this;
        }


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


        /**
         * @return string
         */
        public function toSql(IDriver $driver)
        {
            $output = $driver->escapeIdentifier($this->name) . ' ' . $this->type;

            if (!empty($this->parameters)) {
                $parameters = $this->parameters;
                array_walk($parameters, function (&$value) use ($driver) {
                    $value = Helpers::formatValue($value, $driver);
                });
                $output .= '(' . implode(', ', $parameters) . ')';
            }

            $options = $this->options;
            $specialOptions = array();

            if ($driver instanceof Drivers\MysqlDriver) {
                $specialOptions = array(
                    'CHARACTER SET',
                    'COLLATE',
                );
            }

            foreach ($specialOptions as $option) {
                if (isset($options[$option])) {
                    $output .= ' ' . self::formatOption($option, $options[$option]);
                    unset($options[$option]);
                }
            }

            foreach ($options as $option => $value) {
                $output .= ' ' . self::formatOption($option, $value);
            }

            $output .= ' ' . ($this->nullable ? 'NULL' : 'NOT NULL');

            if (isset($this->defaultValue)) {
                $output .= ' DEFAULT ' . Helpers::formatValue($this->defaultValue, $driver);
            }

            if ($this->autoIncrement) {
                $output .= ' AUTO_INCREMENT';
            }

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

            return $output;
        }


        /**
         * @param  string
         * @param  string|NULL
         * @return string
         */
        private static function formatOption($name, $value)
        {
            return $name . ($value !== NULL ? (' ' . $value) : '');
        }
    }