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<?php
// Own namespace
namespace Org\Mxchange\City\Database\Frontend\Sections;

// Import framework stuff
use Org\Mxchange\CoreFramework\Bootstrap\FrameworkBootstrap;
use Org\Mxchange\CoreFramework\Database\Frontend\BaseDatabaseFrontend;
use Org\Mxchange\CoreFramework\Factory\ObjectFactory;
use Org\Mxchange\CoreFramework\Registry\Registerable;

/**
 * A database frontend for city sections. Sections are the smalles entity of a
 * city. They can be connected with each other and form a lot. Therefore only
 * sections of same type (and sub type) can be linked combined, else you will
 * something really strange, a residential building with some industry parts
 * for example is not possible in real world.
 *
 * Sure you can have a small shop (commercial) on ground level and some
 * residentials on higher levels. This city simulation does support such
 * creations as the levels (Z axis) is different.
 *
 * @author              Roland Haeder <webmaster@shipsimu.org>
 * @version             0.0.0
 * @copyright   Copyright (c) 2015, 2016 City Developer Team
 * @license             GNU GPL 3.0 or any newer version
 * @link                http://www.shipsimu.org
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
class CitySectionsDatabaseFrontend extends BaseDatabaseFrontend implements CitySectionsFrontend, Registerable {
        // Constants for database table names
        const DB_TABLE_CITY_SECTIONS           = 'city_sections';

        // Entry id
        const DB_COLUMN_ENTRY_ID               = 'entry_id';

        // Section id, an referenced city id and lot id
        const DB_COLUMN_SECTION_ID             = 'city_section_id';
        const DB_COLUMN_CITY_ID                = 'city_id';

        /*
         * Lot id, the lot id is only set if the player has "aquired" the sections
         * and has created a lot based on these sections.
         */
        const DB_COLUMN_LOT_ID                 = 'lot_id';

        // Section and sub type (e.g. residential, hut)
        const DB_COLUMN_SECTION_TYPE           = 'section_type';
        const DB_COLUMN_SECTION_SUB_TYPE       = 'section_sub_type';

        // X-Y-Z position
        const DB_COLUMN_SECTION_POSITION_X     = 'section_position_x';
        const DB_COLUMN_SECTION_POSITION_Y     = 'section_position_y';
        const DB_COLUMN_SECTION_POSITION_Z     = 'section_position_z';

        // Connected neigbouring sections
        const DB_COLUMN_SECTION_NEIGHBOUR_WEST_ID  = 'section_neighbour_west_id';
        const DB_COLUMN_SECTION_NEIGHBOUR_EAST_ID  = 'section_neighbour_east_id';
        const DB_COLUMN_SECTION_NEIGHBOUR_NORTH_ID = 'section_neighbour_north_id';
        const DB_COLUMN_SECTION_NEIGHBOUR_SOUTH_ID = 'section_neighbour_south_id';
        const DB_COLUMN_SECTION_NEIGHBOUR_UP_ID    = 'section_neighbour_up_id';
        const DB_COLUMN_SECTION_NEIGHBOUR_DOWN_ID  = 'section_neighbour_down_id';

        // Other settings:
        // Reserved section (see documentation)
        const DB_COLUMN_SECTION_RESERVED       = 'section_reserved';

        // Section types
        // @TODO "water" is not yet supported and may end up in a very random land.
        const SECTION_TYPE_WATER      = 'water';
        const SECTION_TYPE_EMPTY_LAND = 'land';
        const SECTION_TYPE_AIR        = 'air';

        // Sub sections
        // @TODO All types of water are not supported yet.
        const SECTION_SUB_TYPE_GRASS = 'grass';
        const SECTION_SUB_TYPE_AIR   = 'air';

        // Reserved flag
        const IS_NOT_RESERVED = 0;
        const IS_RESERVED     = 1;

        /**
         * Protected constructor
         *
         * @return      void
         */
        protected function __construct () {
                // Call parent constructor
                parent::__construct(__CLASS__);
        }

        /**
         * Creates an instance of this database frontend by a provided user class
         *
         * @return      $frontendInstance       An instance of the created frontend class
         */
        public static final function createCitySectionsDatabaseFrontend () {
                // Get a new instance
                $frontendInstance = new CitySectionsDatabaseFrontend();

                // Set (primary!) table name
                $frontendInstance->setTableName(self::DB_TABLE_CITY_SECTIONS);

                // Return the instance
                return $frontendInstance;
        }

        /**
         * Checks if the given city id is found in sections table
         *
         * @param       $cityId         City id to check
         * @return      $isFound        Whether the city id is found
         */
        public function ifCityHasSections (int $cityId) {
                // Get search instance
                $searchInstance = ObjectFactory::createObjectByConfiguredName('search_criteria_class');

                // Search for 'city_id'
                $searchInstance->addCriteria(self::DB_COLUMN_CITY_ID, $cityId);

                /*
                 * Only one entry is enough to find, else this query could run very
                 * long on large maps.
                 */
                $searchInstance->setLimit(1);

                // Execute it on database instance
                $resultInstance = $this->doSelectByCriteria($searchInstance);

                // Check if there is one entry
                $isFound = $resultInstance->next();

                // Return result
                return $isFound;
        }

        /**
         * Expands the sections table with initial data for given city id
         *
         * @param       $cityId         City id to check
         * @return      $ids            Sections ids from initial expansion
         * @todo        Add handling of water types to make a more cooler map
         */
        public function doInitialCityExpansion (int $cityId) {
                // Make sure this city has no sections
                assert(!$this->ifCityHasSections($cityId));

                /*
                 * "Cache" max "radius" for initial city expansion. It is not a real
                 * radius but more a max expansion area (expand +- half of "radius"
                 * from 0/0). The "zero point" is always calculated in.
                 *
                 * This gives a maxium initial area calculated as follows:
                 *
                 * totalInitialSections = (radius + 1) * (radius + 1)
                 */
                $radius = FrameworkBootstrap::getConfigurationInstance()->getConfigEntry('city_max_initial_xy_expansion_radius');

                // Max up and down ...
                $maxUp   = FrameworkBootstrap::getConfigurationInstance()->getConfigEntry('city_max_initial_up_expansion');
                $maxDown = FrameworkBootstrap::getConfigurationInstance()->getConfigEntry('city_max_initial_down_expansion');

                // Calculate total sections
                $totalSections = (($radius + 1) * ($radius + 1) * $maxUp * ($maxDown + 1));

                // Debug message:
                /* DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('[' . __METHOD__ . ':' . __LINE__ . ']: radius=' . $radius . ',maxUp=' . $maxUp . ',maxDown=' . $maxDown . ',totalSections=' . $totalSections);

                // Get data set instance
                $dataSetInstance = ObjectFactory::createObjectByConfiguredName('dataset_criteria_class', array(self::DB_TABLE_CITY_SECTIONS));

                // Add values for "zero point"
                $dataSetInstance->addCriteria(self::DB_COLUMN_SECTION_ID                , 1);
                $dataSetInstance->addCriteria(self::DB_COLUMN_CITY_ID                   , $cityId);
                $dataSetInstance->addCriteria(self::DB_COLUMN_LOT_ID                    , 0);
                $dataSetInstance->addCriteria(self::DB_COLUMN_SECTION_TYPE              , self::SECTION_TYPE_AIR);
                $dataSetInstance->addCriteria(self::DB_COLUMN_SECTION_SUB_TYPE          , self::SECTION_SUB_TYPE_AIR);
                $dataSetInstance->addCriteria(self::DB_COLUMN_SECTION_POSITION_X        , 0);
                $dataSetInstance->addCriteria(self::DB_COLUMN_SECTION_POSITION_Y        , 0);
                $dataSetInstance->addCriteria(self::DB_COLUMN_SECTION_POSITION_Z        , 0);
                $dataSetInstance->addCriteria(self::DB_COLUMN_SECTION_NEIGHBOUR_NORTH_ID, 0);
                $dataSetInstance->addCriteria(self::DB_COLUMN_SECTION_NEIGHBOUR_SOUTH_ID, 0);
                $dataSetInstance->addCriteria(self::DB_COLUMN_SECTION_NEIGHBOUR_WEST_ID , 0);
                $dataSetInstance->addCriteria(self::DB_COLUMN_SECTION_NEIGHBOUR_EAST_ID , 0);
                $dataSetInstance->addCriteria(self::DB_COLUMN_SECTION_NEIGHBOUR_UP_ID   , 0);
                $dataSetInstance->addCriteria(self::DB_COLUMN_SECTION_NEIGHBOUR_DOWN_ID , 0);
                $dataSetInstance->addCriteria(self::DB_COLUMN_SECTION_RESERVED          , self::IS_NOT_RESERVED);

                // Set primary key to 'city_id'/'section_id'
                $dataSetInstance->setPrimaryKeyCombined(array(self::DB_COLUMN_CITY_ID, self::DB_COLUMN_SECTION_ID));

                // Entry id for counting each entry
                $dataSetInstance->setUniqueKey(self::DB_COLUMN_ENTRY_ID);

                // Add "zero point"
                $this->queryInsertDataSet($dataSetInstance);

                // Set section id to 2 as 1 is already initialized + init array
                $sections = array();

                // Output message to ask for user's patience ...
                self::createDebugInstance(__CLASS__)->debugOutput('[' . __METHOD__ . ':' . __LINE__ . ']: Writing ' . $totalSections . ' sections for city ' . $cityId . ' ... (this may takes some time)');

                // Expand half of it to north/south (north=positive, south=negative)
                for ($north = 1; $north < round($radius / 2); $north++) {
                        // Expand half of it to west/east (west=positive, east=negative)
                        for ($west = 1; $west < round($radius / 2); $west++) {
                                // Expand up/down (including "zero point")
                                for ($z = $maxDown; $z < ($maxUp + 1); $z++) {
                                        // Debug message
                                        //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('[' . __METHOD__ . ':' . __LINE__ . ']: north=' . $north . ',west=' . $west . ',z=' . $z);

                                        // Fill array up with south/east/down ids
                                        $sections[($north * -1)][($west * -1)][$z]['type'] = self::SECTION_TYPE_EMPTY_LAND;
                                        $sections[($north * -1)][($west * -1)][$z]['sub']  = self::SECTION_SUB_TYPE_GRASS;

                                        // Fill up array with north/west/up ids (only air)
                                        $sections[$north][$west][$z]['type'] = self::SECTION_TYPE_AIR;
                                        $sections[$north][$west][$z]['sub']  = self::SECTION_SUB_TYPE_AIR;
                                } // END - for
                        } // END - for
                } // END - for

                // Init section id with 2 as 1 is the "zero point"
                $sectionId = 2;

                // Loop through whole array again for writing it to database: north/south
                foreach ($sections as $x => $sectionX) {
                        // Loop through west/east values
                        foreach ($sectionX as $y => $sectionY) {
                                // Loop through up/down values
                                foreach ($sectionY as $z => $sectionData) {
                                        // Debug message
                                        //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('[' . __METHOD__ . ':' . __LINE__ . ']: x=' . $x . ',y=' . $y . ',z=' . $z . ',sectionId=' . $sectionId);

                                        // Set all coordinates for positive directions
                                        $dataSetInstance->setCriteria(self::DB_COLUMN_SECTION_ID        , $sectionId);
                                        $dataSetInstance->setCriteria(self::DB_COLUMN_SECTION_POSITION_X, $x);
                                        $dataSetInstance->setCriteria(self::DB_COLUMN_SECTION_POSITION_Y, $y);
                                        $dataSetInstance->setCriteria(self::DB_COLUMN_SECTION_POSITION_Z, $z);
                                        $dataSetInstance->setCriteria(self::DB_COLUMN_SECTION_TYPE      , $sectionData['type']);
                                        $dataSetInstance->setCriteria(self::DB_COLUMN_SECTION_SUB_TYPE  , $sectionData['sub']);

                                        // Add value to database
                                        $this->queryInsertDataSet($dataSetInstance);

                                        // Count id up
                                        $sectionId++;
                                } // END - foreach

                                // Debug message
                                //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('[' . __METHOD__ . ':' . __LINE__ . ']: x=' . $x . ',y=' . $y . ' has been written.');
                        } // END - foreach

                        // Debug message
                        //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__)->debugOutput('[' . __METHOD__ . ':' . __LINE__ . ']: x=' . $x . ' has been written.');
                } // END - foreach

                // Thank you for waiting! :-)
                self::createDebugInstance(__CLASS__)->debugOutput('[' . __METHOD__ . ':' . __LINE__ . ']: A total of ' . $totalSections . ' sections has been written for city id ' . $cityId . '.');
        }
}