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<?php

    namespace Inlm\SchemaGenerator;

    use CzProject\SqlSchema;


    class SchemaGenerator
    {
        /** @var IExtractor */
        private $extractor;

        /** @var IAdapter */
        private $adapter;

        /** @var IDumper */
        private $dumper;

        /** @var ILogger|NULL */
        private $logger;

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

        /** @var array */
        private $options;

        /** @var array */
        private $customTypes;

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


        public function __construct(IExtractor $extractor, IAdapter $adapter, IDumper $dumper, ILogger $logger = NULL, $databaseType = Database::MYSQL)
        {
            $this->extractor = $extractor;
            $this->adapter = $adapter;
            $this->dumper = $dumper;
            $this->logger = $logger;
            $this->databaseType = $databaseType;
            $this->prepareDefaults($databaseType);
        }


        /**
         * @param  string
         * @param  string
         * @param  scalar|scalar[]
         * @param  array
         * @return static
         */
        public function setCustomType($name, $dbType, $dbParameters = array(), array $dbOptions = array())
        {
            $this->customTypes[strtolower($name)] = new DataType($dbType, $dbParameters, $dbOptions);
            return $this;
        }


        /**
         * @param  string
         * @param  scalar|NULL
         * @return static
         */
        public function setOption($option, $value)
        {
            if ($value === NULL) {
                $this->removeOption($option);

            } else {
                $this->options[$option] = $value;
            }

            return $this;
        }


        /**
         * @param  string
         * @return static
         */
        public function removeOption($option)
        {
            unset($this->options[$option]);
            return $this;
        }


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


        /**
         * @param  string|NULL
         * @return void
         */
        public function generate($description = NULL)
        {
            if ($this->testMode) {
                $this->log('TEST MODE');
            }

            $configOld = $this->adapter->load();
            $options = $configOld->getOptions() + $this->options;
            $this->log('Generating schema');
            $configNew = new Configuration($this->extractor->generateSchema($options, $this->customTypes, $this->databaseType));
            $configNew->setOptions($options);

            $this->log('Generating diff');
            $schemaDiff = new DiffGenerator($configOld->getSchema(), $configNew->getSchema());

            $this->log('Generating migrations');
            $this->dumper->start($this->databaseType, $description);

            foreach ($schemaDiff->getCreatedAndUpdatedTables() as $diff) {
                if ($diff instanceof Diffs\CreatedTable) {
                    $this->log(" - created table {$diff->getTableName()}");
                    $this->dumper->createTable($diff);

                } elseif ($diff instanceof Diffs\UpdatedTable) {
                    // create
                    foreach ($diff->getCreatedColumns() as $column) {
                        $this->log(" - created column {$column->getTableName()}.{$column->getDefinition()->getName()}");
                        $this->dumper->createTableColumn($column);
                    }

                    foreach ($diff->getCreatedIndexes() as $index) {
                        $this->log(" - created index {$index->getTableName()}.{$index->getDefinition()->getName()}");
                        $this->dumper->createTableIndex($index);
                    }

                    foreach ($diff->getCreatedForeignKeys() as $foreignKey) {
                        $this->log(" - created foreign key {$foreignKey->getTableName()}.{$foreignKey->getDefinition()->getName()}");
                        $this->dumper->createForeignKey($foreignKey);
                    }

                    foreach ($diff->getAddedOptions() as $option) {
                        $this->log(" - added option {$option->getTableName()}.{$option->getOption()}");
                        $this->dumper->addTableOption($option);
                    }

                    // update
                    foreach ($diff->getUpdatedColumns() as $column) {
                        $this->log(" - updated column {$column->getTableName()}.{$column->getDefinition()->getName()}");
                        $this->dumper->updateTableColumn($column);
                    }

                    foreach ($diff->getUpdatedIndexes() as $index) {
                        $this->log(" - updated index {$index->getTableName()}.{$index->getDefinition()->getName()}");
                        $this->dumper->updateTableIndex($index);
                    }

                    foreach ($diff->getUpdatedForeignKeys() as $foreignKey) {
                        $this->log(" - updated foreign key {$foreignKey->getTableName()}.{$foreignKey->getDefinition()->getName()}");
                        $this->dumper->updateForeignKey($foreignKey);
                    }

                    foreach ($diff->getUpdatedOptions() as $option) {
                        $this->log(" - updated option {$option->getTableName()}.{$option->getOption()}");
                        $this->dumper->updateTableOption($option);
                    }

                    foreach ($diff->getUpdatedComments() as $comment) {
                        $this->log(" - updated comment for {$comment->getTableName()}");
                        $this->dumper->updateTableComment($comment);
                    }

                    // remove
                    foreach ($diff->getRemovedForeignKeys() as $foreignKey) {
                        $this->log(" - REMOVED foreign key {$foreignKey->getTableName()}.{$foreignKey->getForeignKeyName()}");
                        $this->dumper->removeForeignKey($foreignKey);
                    }

                    foreach ($diff->getRemovedIndexes() as $index) {
                        $this->log(" - REMOVED index {$index->getTableName()}.{$index->getIndexName()}");
                        $this->dumper->removeTableIndex($index);
                    }

                    foreach ($diff->getRemovedColumns() as $column) {
                        $this->log(" - REMOVED column {$column->getTableName()}.{$column->getColumnName()}");
                        $this->dumper->removeTableColumn($column);
                    }

                    foreach ($diff->getRemovedOptions() as $option) {
                        $this->log(" - REMOVED option {$option->getTableName()}.{$option->getOption()}");
                        $this->dumper->removeTableOption($option);
                    }

                } else {
                    throw new UnsupportedException('Diff ' . get_class($diff) . ' is not supported.');
                }
            }

            foreach ($schemaDiff->getRemovedTables() as $removedTable) {
                $this->log(" - REMOVED table {$removedTable->getTableName()}");
                $this->dumper->removeTable($removedTable);
            }

            $this->dumper->end();

            if (!$this->testMode) {
                $this->log('Saving schema');
                $this->adapter->save($configNew);
            }

            $this->log('Done.');
        }


        private function prepareDefaults($databaseType)
        {
            if ($databaseType === Database::MYSQL) {
                $this->options = array(
                    'ENGINE' => 'InnoDB',
                    'CHARACTER SET' => 'utf8mb4',
                    'COLLATE' => 'utf8mb4_czech_ci',
                );
                $this->setCustomType('money', 'DECIMAL', array(15, 4));
            }
        }


        /**
         * @param  string
         * @return void
         */
        private function log($msg)
        {
            if (isset($this->logger)) {
                $this->logger->log($msg);
            }
        }
    }