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<?php

    namespace CzProject\SqlSchema;


    class Table
    {
        /** @var string */
        private $name;

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

        /** @var array  [name => Column] */
        private $columns = array();

        /** @var array  [name => Index] */
        private $indexes = array();

        /** @var array  [name => ForeignKey] */
        private $foreignKeys = array();

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


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


        /**
         * @return string
         */
        public function getName()
        {
            return $this->name;
        }


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


        /**
         * @return string|NULL
         */
        public function getComment()
        {
            return $this->comment;
        }


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


        /**
         * @return array
         */
        public function getOptions()
        {
            return $this->options;
        }


        /**
         * @param  string|Column
         * @param  string|NULL
         * @param  array|string|NULL
         * @param  array OPTION => NULL
         * @return Column
         */
        public function addColumn($name, $type = NULL, $parameters = NULL, array $options = array())
        {
            $column = NULL;

            if ($name instanceof Column) {
                $column = $name;
                $name = $column->getName();

            } else {
                $column = new Column($name, $type, $parameters, $options);
            }

            if (isset($this->columns[$name])) {
                throw new DuplicateException("Column '$name' in table '{$this->getName()}' already exists.");
            }

            return $this->columns[$name] = $column;
        }


        /**
         * @param  string
         * @return Column|NULL
         */
        public function getColumn($name)
        {
            if (isset($this->columns[$name])) {
                return $this->columns[$name];
            }
            return NULL;
        }


        /**
         * @return Column[]
         */
        public function getColumns()
        {
            return $this->columns;
        }


        /**
         * @param  string|Index|NULL
         * @param  string[]|string
         * @param  string
         * @return Index
         */
        public function addIndex($name, $columns = array(), $type = Index::TYPE_INDEX)
        {
            $index = NULL;

            if ($name instanceof Index) {
                $index = $name;
                $name = $index->getName();

            } else {
                $index = new Index($name, $columns, $type);
                $name = $index->getName();
            }

            if (isset($this->indexes[$name])) {
                throw new DuplicateException("Index '$name' in table '{$this->getName()}' already exists.");
            }

            return $this->indexes[$name] = $index;
        }


        /**
         * @param  string
         * @return Index|NULL
         */
        public function getIndex($name)
        {
            if (isset($this->indexes[$name])) {
                return $this->indexes[$name];
            }
            return NULL;
        }


        /**
         * @return Index[]
         */
        public function getIndexes()
        {
            return $this->indexes;
        }


        /**
         * @param  string|ForeignKey
         * @param  string[]|string
         * @param  string
         * @param  string[]|string
         * @return ForeignKey
         */
        public function addForeignKey($name, $columns = array(), $targetTable = NULL, $targetColumns = array())
        {
            $foreignKey = NULL;

            if ($name instanceof ForeignKey) {
                $foreignKey = $name;
                $name = $foreignKey->getName();

            } else {
                $foreignKey = new ForeignKey($name, $columns, $targetTable, $targetColumns);
                $name = $foreignKey->getName();
            }

            if (isset($this->foreignKeys[$name])) {
                throw new DuplicateException("Foreign key '$name' in table '{$this->getName()}' already exists.");
            }

            return $this->foreignKeys[$name] = $foreignKey;
        }


        /**
         * @param  string
         * @return ForeignKey|NULL
         */
        public function getForeignKey($name)
        {
            if (isset($this->foreignKeys[$name])) {
                return $this->foreignKeys[$name];
            }
            return NULL;
        }


        /**
         * @return ForeignKey[]
         */
        public function getForeignKeys()
        {
            return $this->foreignKeys;
        }


        /**
         * @throws Exception
         * @return void
         */
        public function validate()
        {
            $tableName = $this->getName();

            if (empty($this->columns)) {
                throw new EmptyException("Table '$tableName' hasn't columns.");
            }

            $hasPrimaryIndex = FALSE;

            foreach ($this->getIndexes() as $index) {
                if ($index->getType() === Index::TYPE_PRIMARY) {
                    if ($hasPrimaryIndex) {
                        throw new DuplicateException("Duplicated primary index in table '$tableName'.");
                    }
                    $hasPrimaryIndex = TRUE;
                }
            }
        }
    }