<?php

declare(strict_types=1);

namespace PhpMyAdmin\Controllers\Table;

use PhpMyAdmin\ConfigStorage\Relation;
use PhpMyAdmin\ConfigStorage\RelationCleanup;
use PhpMyAdmin\Core;
use PhpMyAdmin\DatabaseInterface;
use PhpMyAdmin\DbTableExists;
use PhpMyAdmin\Operations;
use PhpMyAdmin\ResponseRenderer;
use PhpMyAdmin\Sql;
use PhpMyAdmin\Table\Search;
use PhpMyAdmin\Template;
use PhpMyAdmin\Transformations;
use PhpMyAdmin\Url;
use PhpMyAdmin\Util;
use PhpMyAdmin\Utils\Gis;

use function in_array;
use function intval;
use function mb_strtolower;
use function md5;
use function preg_match;
use function preg_replace;
use function str_ireplace;
use function str_replace;
use function strncasecmp;
use function strtoupper;

/**
 * Handles table search tab.
 *
 * Display table search form, create SQL query from form data
 * and call Sql::executeQueryAndSendQueryResponse() to execute it.
 */
class SearchController extends AbstractController
{
    /**
     * Names of columns
     *
     * @var array
     */
    private $columnNames;
    /**
     * Types of columns
     *
     * @var array
     */
    private $columnTypes;
    /**
     * Types of columns without any replacement
     *
     * @var array
     */
    private $originalColumnTypes;
    /**
     * Collations of columns
     *
     * @var array
     */
    private $columnCollations;
    /**
     * Null Flags of columns
     *
     * @var array
     */
    private $columnNullFlags;
    /**
     * Whether a geometry column is present
     *
     * @var bool
     */
    private $geomColumnFlag;
    /**
     * Foreign Keys
     *
     * @var array
     */
    private $foreigners;

    /** @var Search */
    private $search;

    /** @var Relation */
    private $relation;

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

    public function __construct(
        ResponseRenderer $response,
        Template $template,
        string $db,
        string $table,
        Search $search,
        Relation $relation,
        DatabaseInterface $dbi
    ) {
        parent::__construct($response, $template, $db, $table);
        $this->search = $search;
        $this->relation = $relation;
        $this->dbi = $dbi;

        $this->columnNames = [];
        $this->columnTypes = [];
        $this->originalColumnTypes = [];
        $this->columnCollations = [];
        $this->columnNullFlags = [];
        $this->geomColumnFlag = false;
        $this->foreigners = [];
        $this->loadTableInfo();
    }

    /**
     * Gets all the columns of a table along with their types, collations
     * and whether null or not.
     */
    private function loadTableInfo(): void
    {
        // Gets the list and number of columns
        $columns = $this->dbi->getColumns($this->db, $this->table, true);
        // Get details about the geometry functions
        $geom_types = Gis::getDataTypes();

        foreach ($columns as $row) {
            // set column name
            $this->columnNames[] = $row['Field'];

            $type = (string) $row['Type'];
            // before any replacement
            $this->originalColumnTypes[] = mb_strtolower($type);
            // check whether table contains geometric columns
            if (in_array($type, $geom_types)) {
                $this->geomColumnFlag = true;
            }

            // reformat mysql query output
            if (strncasecmp($type, 'set', 3) == 0 || strncasecmp($type, 'enum', 4) == 0) {
                $type = str_replace(',', ', ', $type);
            } else {
                // strip the "BINARY" attribute, except if we find "BINARY(" because
                // this would be a BINARY or VARBINARY column type
                if (! preg_match('@BINARY[\(]@i', $type)) {
                    $type = str_ireplace('BINARY', '', $type);
                }

                $type = str_ireplace('ZEROFILL', '', $type);
                $type = str_ireplace('UNSIGNED', '', $type);
                $type = mb_strtolower($type);
            }

            if (empty($type)) {
                $type = '&nbsp;';
            }

            $this->columnTypes[] = $type;
            $this->columnNullFlags[] = $row['Null'] === 'YES';
            $this->columnCollations[] = ! empty($row['Collation']) && $row['Collation'] !== 'NULL'
                ? $row['Collation']
                : '';
        }

        // Retrieve foreign keys
        $this->foreigners = $this->relation->getForeigners($this->db, $this->table);
    }

    /**
     * Index action
     */
    public function __invoke(): void
    {
        global $db, $table, $urlParams, $cfg, $errorUrl;

        Util::checkParameters(['db', 'table']);

        $urlParams = ['db' => $db, 'table' => $table];
        $errorUrl = Util::getScriptNameForOption($cfg['DefaultTabTable'], 'table');
        $errorUrl .= Url::getCommon($urlParams, '&');

        DbTableExists::check();

        $this->addScriptFiles([
            'makegrid.js',
            'sql.js',
            'table/select.js',
            'table/change.js',
            'vendor/jquery/jquery.uitablefilter.js',
            'gis_data_editor.js',
        ]);

        if (isset($_POST['range_search'])) {
            $this->rangeSearchAction();

            return;
        }

        /**
         * No selection criteria received -> display the selection form
         */
        if (! isset($_POST['columnsToDisplay']) && ! isset($_POST['displayAllColumns'])) {
            $this->displaySelectionFormAction();
        } else {
            $this->doSelectionAction();
        }
    }

    /**
     * Get data row action
     */
    public function getDataRowAction(): void
    {
        if (! Core::checkSqlQuerySignature($_POST['where_clause'], $_POST['where_clause_sign'])) {
            return;
        }

        $extra_data = [];
        $row_info_query = 'SELECT * FROM ' . Util::backquote($_POST['db']) . '.'
            . Util::backquote($_POST['table']) . ' WHERE ' . $_POST['where_clause'];
        $result = $this->dbi->query($row_info_query . ';');
        $fields_meta = $this->dbi->getFieldsMeta($result);
        while ($row = $result->fetchAssoc()) {
            // for bit fields we need to convert them to printable form
            $i = 0;
            foreach ($row as $col => $val) {
                if (isset($fields_meta[$i]) && $fields_meta[$i]->isMappedTypeBit) {
                    $row[$col] = Util::printableBitValue((int) $val, (int) $fields_meta[$i]->length);
                }

                $i++;
            }

            $extra_data['row_info'] = $row;
        }

        $this->response->addJSON($extra_data);
    }

    /**
     * Do selection action
     */
    public function doSelectionAction(): void
    {
        /**
         * Selection criteria have been submitted -> do the work
         */
        $sql_query = $this->search->buildSqlQuery();

        /**
         * Add this to ensure following procedures included running correctly.
         */
        $sql = new Sql(
            $this->dbi,
            $this->relation,
            new RelationCleanup($this->dbi, $this->relation),
            new Operations($this->dbi, $this->relation),
            new Transformations(),
            $this->template
        );

        $this->response->addHTML($sql->executeQueryAndSendQueryResponse(
            null, // analyzed_sql_results
            false, // is_gotofile
            $this->db, // db
            $this->table, // table
            null, // find_real_end
            null, // sql_query_for_bookmark
            null, // extra_data
            null, // message_to_show
            null, // sql_data
            $GLOBALS['goto'], // goto
            null, // disp_query
            null, // disp_message
            $sql_query, // sql_query
            null // complete_query
        ));
    }

    /**
     * Display selection form action
     */
    public function displaySelectionFormAction(): void
    {
        global $goto, $cfg;

        if (! isset($goto)) {
            $goto = Util::getScriptNameForOption($cfg['DefaultTabTable'], 'table');
        }

        $this->render('table/search/index', [
            'db' => $this->db,
            'table' => $this->table,
            'goto' => $goto,
            'self' => $this,
            'geom_column_flag' => $this->geomColumnFlag,
            'column_names' => $this->columnNames,
            'column_types' => $this->columnTypes,
            'column_collations' => $this->columnCollations,
            'default_sliders_state' => $cfg['InitialSlidersState'],
            'max_rows' => intval($cfg['MaxRows']),
        ]);
    }

    /**
     * Range search action
     */
    public function rangeSearchAction(): void
    {
        $min_max = $this->getColumnMinMax($_POST['column']);
        $this->response->addJSON('column_data', $min_max);
    }

    /**
     * Finds minimum and maximum value of a given column.
     *
     * @param string $column Column name
     *
     * @return array|null
     */
    public function getColumnMinMax($column): ?array
    {
        $sql_query = 'SELECT MIN(' . Util::backquote($column) . ') AS `min`, '
            . 'MAX(' . Util::backquote($column) . ') AS `max` '
            . 'FROM ' . Util::backquote($this->db) . '.'
            . Util::backquote($this->table);

        return $this->dbi->fetchSingleRow($sql_query);
    }

    /**
     * Provides a column's type, collation, operators list, and criteria value
     * to display in table search form
     *
     * @param int $search_index Row number in table search form
     * @param int $column_index Column index in ColumnNames array
     *
     * @return array Array containing column's properties
     */
    public function getColumnProperties($search_index, $column_index)
    {
        $selected_operator = ($_POST['criteriaColumnOperators'][$search_index] ?? '');
        $entered_value = ($_POST['criteriaValues'] ?? '');
        //Gets column's type and collation
        $type = $this->columnTypes[$column_index];
        $collation = $this->columnCollations[$column_index];
        $cleanType = preg_replace('@\(.*@s', '', $type);
        //Gets column's comparison operators depending on column type
        $typeOperators = $this->dbi->types->getTypeOperatorsHtml(
            $cleanType,
            $this->columnNullFlags[$column_index],
            $selected_operator
        );
        $func = $this->template->render('table/search/column_comparison_operators', [
            'search_index' => $search_index,
            'type_operators' => $typeOperators,
        ]);
        //Gets link to browse foreign data(if any) and criteria inputbox
        $foreignData = $this->relation->getForeignData(
            $this->foreigners,
            $this->columnNames[$column_index],
            false,
            '',
            ''
        );
        $htmlAttributes = '';
        if (in_array($cleanType, $this->dbi->types->getIntegerTypes())) {
            $extractedColumnspec = Util::extractColumnSpec($this->originalColumnTypes[$column_index]);
            $is_unsigned = $extractedColumnspec['unsigned'];
            $minMaxValues = $this->dbi->types->getIntegerRange($cleanType, ! $is_unsigned);
            $htmlAttributes = 'data-min="' . $minMaxValues[0] . '" '
                            . 'data-max="' . $minMaxValues[1] . '"';
        }

        $htmlAttributes .= ' onfocus="return '
                        . 'verifyAfterSearchFieldChange(' . $search_index . ', \'#tbl_search_form\')"';

        $value = $this->template->render('table/search/input_box', [
            'str' => '',
            'column_type' => (string) $type,
            'column_data_type' => strtoupper($cleanType),
            'html_attributes' => $htmlAttributes,
            'column_id' => 'fieldID_',
            'in_zoom_search_edit' => false,
            'foreigners' => $this->foreigners,
            'column_name' => $this->columnNames[$column_index],
            'column_name_hash' => md5($this->columnNames[$column_index]),
            'foreign_data' => $foreignData,
            'table' => $this->table,
            'column_index' => $search_index,
            'foreign_max_limit' => $GLOBALS['cfg']['ForeignKeyMaxLimit'],
            'criteria_values' => $entered_value,
            'db' => $this->db,
            'in_fbs' => true,
        ]);

        return [
            'type' => $type,
            'collation' => $collation,
            'func' => $func,
            'value' => $value,
        ];
    }
}
