<?php

declare(strict_types=1);

namespace PhpMyAdmin\Controllers\Table;

use PhpMyAdmin\Core;
use PhpMyAdmin\DatabaseInterface;
use PhpMyAdmin\Html\Generator;
use PhpMyAdmin\Index;
use PhpMyAdmin\Relation;
use PhpMyAdmin\Response;
use PhpMyAdmin\Table;
use PhpMyAdmin\Template;
use PhpMyAdmin\Util;
use function array_key_exists;
use function array_keys;
use function array_values;
use function htmlspecialchars;
use function mb_strtoupper;
use function md5;
use function strtoupper;
use function uksort;
use function usort;

/**
 * Display table relations for viewing and editing.
 *
 * Includes phpMyAdmin relations and InnoDB relations.
 */
final class RelationController extends AbstractController
{
    /** @var Relation */
    private $relation;

    /** @var DatabaseInterface */
    private $dbi;

    /**
     * @param Response          $response
     * @param string            $db       Database name
     * @param string            $table    Table name
     * @param DatabaseInterface $dbi
     */
    public function __construct(
        $response,
        Template $template,
        $db,
        $table,
        Relation $relation,
        $dbi
    ) {
        parent::__construct($response, $template, $db, $table);
        $this->relation = $relation;
        $this->dbi = $dbi;
    }

    /**
     * Index
     */
    public function index(): void
    {
        global $route;

        $options = [
            'CASCADE' => 'CASCADE',
            'SET_NULL' => 'SET NULL',
            'NO_ACTION' => 'NO ACTION',
            'RESTRICT' => 'RESTRICT',
        ];

        $table = $this->dbi->getTable($this->db, $this->table);
        $storageEngine = mb_strtoupper((string) $table->getStatusInfo('Engine'));

        $cfgRelation = $this->relation->getRelationsParam();

        $relations = [];
        if ($cfgRelation['relwork']) {
            $relations = $this->relation->getForeigners(
                $this->db,
                $this->table,
                '',
                'internal'
            );
        }

        $relationsForeign = [];
        if (Util::isForeignKeySupported($storageEngine)) {
            $relationsForeign = $this->relation->getForeigners(
                $this->db,
                $this->table,
                '',
                'foreign'
            );
        }

        // Send table of column names to populate corresponding dropdowns depending
        // on the current selection
        if (isset($_POST['getDropdownValues'])
            && $_POST['getDropdownValues'] === 'true'
        ) {
            // if both db and table are selected
            if (isset($_POST['foreignTable'])) {
                $this->getDropdownValueForTable();
            } else { // if only the db is selected
                $this->getDropdownValueForDatabase($storageEngine);
            }

            return;
        }

        $this->addScriptFiles(['table/relation.js', 'indexes.js']);

        // Set the database
        $this->dbi->selectDb($this->db);

        // updates for Internal relations
        if (isset($_POST['destination_db']) && $cfgRelation['relwork']) {
            $this->updateForInternalRelation($table, $cfgRelation, $relations);
        }

        // updates for foreign keys
        $this->updateForForeignKeys($table, $options, $relationsForeign);

        // Updates for display field
        if ($cfgRelation['displaywork'] && isset($_POST['display_field'])) {
            $this->updateForDisplayField($table, $cfgRelation);
        }

        // If we did an update, refresh our data
        if (isset($_POST['destination_db']) && $cfgRelation['relwork']) {
            $relations = $this->relation->getForeigners(
                $this->db,
                $this->table,
                '',
                'internal'
            );
        }
        if (isset($_POST['destination_foreign_db'])
            && Util::isForeignKeySupported($storageEngine)
        ) {
            $relationsForeign = $this->relation->getForeigners(
                $this->db,
                $this->table,
                '',
                'foreign'
            );
        }

        /**
         * Dialog
         */
        // Now find out the columns of our $table
        // need to use DatabaseInterface::QUERY_STORE with $this->dbi->numRows()
        // in mysqli
        $columns = $this->dbi->getColumns($this->db, $this->table);

        $column_array = [];
        $column_hash_array = [];
        $column_array[''] = '';
        foreach ($columns as $column) {
            if (strtoupper($storageEngine) !== 'INNODB'
                && empty($column['Key'])
            ) {
                continue;
            }

            $column_array[$column['Field']] = $column['Field'];
            $column_hash_array[$column['Field']] = md5($column['Field']);
        }
        if ($GLOBALS['cfg']['NaturalOrder']) {
            uksort($column_array, 'strnatcasecmp');
        }

        // common form
        $engine = $this->dbi->getTable($this->db, $this->table)->getStorageEngine();
        $this->render('table/relation/common_form', [
            'is_foreign_key_supported' => Util::isForeignKeySupported($engine),
            'db' => $this->db,
            'table' => $this->table,
            'cfg_relation' => $cfgRelation,
            'tbl_storage_engine' => $storageEngine,
            'existrel' => $relations,
            'existrel_foreign' => array_key_exists('foreign_keys_data', $relationsForeign)
                ? $relationsForeign['foreign_keys_data']
                : [],
            'options_array' => $options,
            'column_array' => $column_array,
            'column_hash_array' => $column_hash_array,
            'save_row' => array_values($columns),
            'url_params' => $GLOBALS['url_params'],
            'databases' => $GLOBALS['dblist']->databases,
            'dbi' => $this->dbi,
            'default_sliders_state' => $GLOBALS['cfg']['InitialSlidersState'],
            'route' => $route,
        ]);
    }

    /**
     * Update for display field
     *
     * @param Table $table       table
     * @param array $cfgRelation relation parameters
     */
    private function updateForDisplayField(Table $table, array $cfgRelation): void
    {
        if (! $table->updateDisplayField(
            $_POST['display_field'],
            $cfgRelation
        )) {
            return;
        }

        $this->response->addHTML(
            Generator::getMessage(
                __('Display column was successfully updated.'),
                '',
                'success'
            )
        );
    }

    /**
     * Update for FK
     *
     * @param Table $table            Table
     * @param array $options          Options
     * @param array $relationsForeign External relations
     */
    private function updateForForeignKeys(Table $table, array $options, array $relationsForeign): void
    {
        $multi_edit_columns_name = $_POST['foreign_key_fields_name'] ?? null;
        $preview_sql_data = '';
        $seen_error = false;

        // (for now, one index name only; we keep the definitions if the
        // foreign db is not the same)
        if (isset($_POST['destination_foreign_db'], $_POST['destination_foreign_table'])
            && isset($_POST['destination_foreign_column'])) {
            [
                $html,
                $preview_sql_data,
                $display_query,
                $seen_error,
            ] = $table->updateForeignKeys(
                $_POST['destination_foreign_db'],
                $multi_edit_columns_name,
                $_POST['destination_foreign_table'],
                $_POST['destination_foreign_column'],
                $options,
                $this->table,
                array_key_exists('foreign_keys_data', $relationsForeign)
                    ? $relationsForeign['foreign_keys_data']
                    : []
            );
            $this->response->addHTML($html);
        }

        // If there is a request for SQL previewing.
        if (isset($_POST['preview_sql'])) {
            Core::previewSQL($preview_sql_data);

            exit;
        }

        if (empty($display_query) || $seen_error) {
            return;
        }

        $GLOBALS['display_query'] = $display_query;
        $this->response->addHTML(
            Generator::getMessage(
                __('Your SQL query has been executed successfully.'),
                null,
                'success'
            )
        );
    }

    /**
     * Update for internal relation
     *
     * @param Table $table       Table
     * @param array $cfgRelation Relation parameters
     * @param array $relations   Relations
     */
    private function updateForInternalRelation(Table $table, array $cfgRelation, array $relations): void
    {
        $multi_edit_columns_name = $_POST['fields_name'] ?? null;

        if (! $table->updateInternalRelations(
            $multi_edit_columns_name,
            $_POST['destination_db'],
            $_POST['destination_table'],
            $_POST['destination_column'],
            $cfgRelation,
            $relations
        )) {
            return;
        }

        $this->response->addHTML(
            Generator::getMessage(
                __('Internal relationships were successfully updated.'),
                '',
                'success'
            )
        );
    }

    /**
     * Send table columns for foreign table dropdown
     */
    public function getDropdownValueForTable(): void
    {
        $foreignTable = $_POST['foreignTable'];
        $table_obj = $this->dbi->getTable($_POST['foreignDb'], $foreignTable);
        // Since views do not have keys defined on them provide the full list of
        // columns
        if ($table_obj->isView()) {
            $columnList = $table_obj->getColumns(false, false);
        } else {
            $columnList = $table_obj->getIndexedColumns(false, false);
        }
        $columns = [];
        foreach ($columnList as $column) {
            $columns[] = htmlspecialchars($column);
        }
        if ($GLOBALS['cfg']['NaturalOrder']) {
            usort($columns, 'strnatcasecmp');
        }
        $this->response->addJSON('columns', $columns);

        // @todo should be: $server->db($db)->table($table)->primary()
        $primary = Index::getPrimary($foreignTable, $_POST['foreignDb']);
        if ($primary === false) {
            return;
        }

        $this->response->addJSON('primary', array_keys($primary->getColumns()));
    }

    /**
     * Send database selection values for dropdown
     *
     * @param string $storageEngine Storage engine.
     */
    public function getDropdownValueForDatabase(string $storageEngine): void
    {
        $tables = [];
        $foreign = isset($_POST['foreign']) && $_POST['foreign'] === 'true';

        if ($foreign) {
            $query = 'SHOW TABLE STATUS FROM '
                . Util::backquote($_POST['foreignDb']);
            $tables_rs = $this->dbi->query(
                $query,
                DatabaseInterface::CONNECT_USER,
                DatabaseInterface::QUERY_STORE
            );

            while ($row = $this->dbi->fetchArray($tables_rs)) {
                if (! isset($row['Engine'])
                    || mb_strtoupper($row['Engine']) != $storageEngine
                ) {
                    continue;
                }

                $tables[] = htmlspecialchars($row['Name']);
            }
        } else {
            $query = 'SHOW TABLES FROM '
                . Util::backquote($_POST['foreignDb']);
            $tables_rs = $this->dbi->query(
                $query,
                DatabaseInterface::CONNECT_USER,
                DatabaseInterface::QUERY_STORE
            );
            while ($row = $this->dbi->fetchArray($tables_rs)) {
                $tables[] = htmlspecialchars($row[0]);
            }
        }
        if ($GLOBALS['cfg']['NaturalOrder']) {
            usort($tables, 'strnatcasecmp');
        }
        $this->response->addJSON('tables', $tables);
    }
}
