<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * Functions for trigger management.
 *
 * @package PhpMyAdmin
 */
declare(strict_types=1);

namespace PhpMyAdmin\Rte;

use PhpMyAdmin\DatabaseInterface;
use PhpMyAdmin\Message;
use PhpMyAdmin\Response;
use PhpMyAdmin\Url;
use PhpMyAdmin\Util;

/**
 * PhpMyAdmin\Rte\Triggers class
 *
 * @package PhpMyAdmin
 */
class Triggers
{
    /**
     * @var Export
     */
    private $export;

    /**
     * @var Footer
     */
    private $footer;

    /**
     * @var General
     */
    private $general;

    /**
     * @var RteList
     */
    private $rteList;

    /**
     * @var Words
     */
    private $words;

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

    /**
     * Triggers constructor.
     *
     * @param DatabaseInterface $dbi DatabaseInterface object
     */
    public function __construct(DatabaseInterface $dbi)
    {
        $this->dbi = $dbi;
        $this->export = new Export($this->dbi);
        $this->footer = new Footer($this->dbi);
        $this->general = new General($this->dbi);
        $this->rteList = new RteList($this->dbi);
        $this->words = new Words();
    }

    /**
     * Sets required globals
     *
     * @return void
     */
    public function setGlobals()
    {
        global $action_timings, $event_manipulations;

        // Some definitions for triggers
        $action_timings = [
            'BEFORE',
            'AFTER',
        ];
        $event_manipulations = [
            'INSERT',
            'UPDATE',
            'DELETE',
        ];
    }

    /**
     * Main function for the triggers functionality
     *
     * @return void
     */
    public function main()
    {
        global $db, $table;

        $this->setGlobals();
        /**
         * Process all requests
         */
        $this->handleEditor();
        $this->export->triggers();
        /**
         * Display a list of available triggers
         */
        $items = $this->dbi->getTriggers($db, $table);
        echo $this->rteList->get('trigger', $items);
        /**
         * Display a link for adding a new trigger,
         * if the user has the necessary privileges
         */
        echo $this->footer->triggers();
    }

    /**
     * Handles editor requests for adding or editing an item
     *
     * @return void
     */
    public function handleEditor()
    {
        global $errors, $db, $table;

        if (! empty($_POST['editor_process_add'])
            || ! empty($_POST['editor_process_edit'])
        ) {
            $sql_query = '';

            $item_query = $this->getQueryFromRequest();

            if (! count($errors)) { // set by PhpMyAdmin\Rte\Routines::getQueryFromRequest()
                // Execute the created query
                if (! empty($_POST['editor_process_edit'])) {
                    // Backup the old trigger, in case something goes wrong
                    $trigger = $this->getDataFromName($_POST['item_original_name']);
                    $create_item = $trigger['create'];
                    $drop_item = $trigger['drop'] . ';';
                    $result = $this->dbi->tryQuery($drop_item);
                    if (! $result) {
                        $errors[] = sprintf(
                            __('The following query has failed: "%s"'),
                            htmlspecialchars($drop_item)
                        )
                        . '<br>'
                        . __('MySQL said: ') . $this->dbi->getError();
                    } else {
                        $result = $this->dbi->tryQuery($item_query);
                        if (! $result) {
                            $errors[] = sprintf(
                                __('The following query has failed: "%s"'),
                                htmlspecialchars($item_query)
                            )
                            . '<br>'
                            . __('MySQL said: ') . $this->dbi->getError();
                            // We dropped the old item, but were unable to create the
                            // new one. Try to restore the backup query.
                            $result = $this->dbi->tryQuery($create_item);

                            $errors = $this->general->checkResult(
                                $result,
                                __(
                                    'Sorry, we failed to restore the dropped trigger.'
                                ),
                                $create_item,
                                $errors
                            );
                        } else {
                            $message = Message::success(
                                __('Trigger %1$s has been modified.')
                            );
                            $message->addParam(
                                Util::backquote($_POST['item_name'])
                            );
                            $sql_query = $drop_item . $item_query;
                        }
                    }
                } else {
                    // 'Add a new item' mode
                    $result = $this->dbi->tryQuery($item_query);
                    if (! $result) {
                        $errors[] = sprintf(
                            __('The following query has failed: "%s"'),
                            htmlspecialchars($item_query)
                        )
                        . '<br><br>'
                        . __('MySQL said: ') . $this->dbi->getError();
                    } else {
                        $message = Message::success(
                            __('Trigger %1$s has been created.')
                        );
                        $message->addParam(
                            Util::backquote($_POST['item_name'])
                        );
                        $sql_query = $item_query;
                    }
                }
            }

            if (count($errors)) {
                $message = Message::error(
                    '<b>'
                    . __(
                        'One or more errors have occurred while processing your request:'
                    )
                    . '</b>'
                );
                $message->addHtml('<ul>');
                foreach ($errors as $string) {
                    $message->addHtml('<li>' . $string . '</li>');
                }
                $message->addHtml('</ul>');
            }

            $output = Util::getMessage($message, $sql_query);
            $response = Response::getInstance();
            if ($response->isAjax()) {
                if ($message->isSuccess()) {
                    $items = $this->dbi->getTriggers($db, $table, '');
                    $trigger = false;
                    foreach ($items as $value) {
                        if ($value['name'] == $_POST['item_name']) {
                            $trigger = $value;
                        }
                    }
                    $insert = false;
                    if (empty($table)
                        || ($trigger !== false && $table == $trigger['table'])
                    ) {
                        $insert = true;
                        $response->addJSON('new_row', $this->rteList->getTriggerRow($trigger));
                        $response->addJSON(
                            'name',
                            htmlspecialchars(
                                mb_strtoupper(
                                    $_POST['item_name']
                                )
                            )
                        );
                    }
                    $response->addJSON('insert', $insert);
                    $response->addJSON('message', $output);
                } else {
                    $response->addJSON('message', $message);
                    $response->setRequestStatus(false);
                }
                exit;
            }
        }

        /**
         * Display a form used to add/edit a trigger, if necessary
         */
        if (count($errors)
            || (empty($_POST['editor_process_add'])
            && empty($_POST['editor_process_edit'])
            && (! empty($_REQUEST['add_item'])
            || ! empty($_REQUEST['edit_item']))) // FIXME: this must be simpler than that
        ) {
            // Get the data for the form (if any)
            if (! empty($_REQUEST['add_item'])) {
                $title = $this->words->get('add');
                $item = $this->getDataFromRequest();
                $mode = 'add';
            } elseif (! empty($_REQUEST['edit_item'])) {
                $title = __("Edit trigger");
                if (! empty($_REQUEST['item_name'])
                    && empty($_POST['editor_process_edit'])
                ) {
                    $item = $this->getDataFromName($_REQUEST['item_name']);
                    if ($item !== false) {
                        $item['item_original_name'] = $item['item_name'];
                    }
                } else {
                    $item = $this->getDataFromRequest();
                }
                $mode = 'edit';
            }
            $this->general->sendEditor('TRI', $mode, $item, $title, $db);
        }
    }

    /**
     * This function will generate the values that are required to for the editor
     *
     * @return array    Data necessary to create the editor.
     */
    public function getDataFromRequest()
    {
        $retval = [];
        $indices = [
            'item_name',
            'item_table',
            'item_original_name',
            'item_action_timing',
            'item_event_manipulation',
            'item_definition',
            'item_definer',
        ];
        foreach ($indices as $index) {
            $retval[$index] = isset($_POST[$index]) ? $_POST[$index] : '';
        }
        return $retval;
    }

    /**
     * This function will generate the values that are required to complete
     * the "Edit trigger" form given the name of a trigger.
     *
     * @param string $name The name of the trigger.
     *
     * @return array|bool Data necessary to create the editor.
     */
    public function getDataFromName($name)
    {
        global $db, $table;

        $temp = [];
        $items = $this->dbi->getTriggers($db, $table, '');
        foreach ($items as $value) {
            if ($value['name'] == $name) {
                $temp = $value;
            }
        }
        if (empty($temp)) {
            return false;
        } else {
            $retval = [];
            $retval['create']                  = $temp['create'];
            $retval['drop']                    = $temp['drop'];
            $retval['item_name']               = $temp['name'];
            $retval['item_table']              = $temp['table'];
            $retval['item_action_timing']      = $temp['action_timing'];
            $retval['item_event_manipulation'] = $temp['event_manipulation'];
            $retval['item_definition']         = $temp['definition'];
            $retval['item_definer']            = $temp['definer'];
            return $retval;
        }
    }

    /**
     * Displays a form used to add/edit a trigger
     *
     * @param string $mode If the editor will be used to edit a trigger
     *                     or add a new one: 'edit' or 'add'.
     * @param array  $item Data for the trigger returned by getDataFromRequest()
     *                     or getDataFromName()
     *
     * @return string HTML code for the editor.
     */
    public function getEditorForm($mode, array $item)
    {
        global $db, $table, $event_manipulations, $action_timings;

        $modeToUpper = mb_strtoupper($mode);
        $response = Response::getInstance();

        // Escape special characters
        $need_escape = [
            'item_original_name',
            'item_name',
            'item_definition',
            'item_definer',
        ];
        foreach ($need_escape as $key => $index) {
            $item[$index] = htmlentities($item[$index], ENT_QUOTES, 'UTF-8');
        }
        $original_data = '';
        if ($mode == 'edit') {
            $original_data = "<input name='item_original_name' "
                           . "type='hidden' value='{$item['item_original_name']}'>\n";
        }
        $query  = "SELECT `TABLE_NAME` FROM `INFORMATION_SCHEMA`.`TABLES` ";
        $query .= "WHERE `TABLE_SCHEMA`='" . $this->dbi->escapeString($db) . "' ";
        $query .= "AND `TABLE_TYPE` IN ('BASE TABLE', 'SYSTEM VERSIONED')";
        $tables = $this->dbi->fetchResult($query);

        // Create the output
        $retval  = "";
        $retval .= "<!-- START " . $modeToUpper . " TRIGGER FORM -->\n\n";
        $retval .= "<form class='rte_form' action='db_triggers.php' method='post'>\n";
        $retval .= "<input name='{$mode}_item' type='hidden' value='1'>\n";
        $retval .= $original_data;
        $retval .= Url::getHiddenInputs($db, $table) . "\n";
        $retval .= "<fieldset>\n";
        $retval .= "<legend>" . __('Details') . "</legend>\n";
        $retval .= "<table class='rte_table'>\n";
        $retval .= "<tr>\n";
        $retval .= "    <td>" . __('Trigger name') . "</td>\n";
        $retval .= "    <td><input type='text' name='item_name' maxlength='64'\n";
        $retval .= "               value='{$item['item_name']}'></td>\n";
        $retval .= "</tr>\n";
        $retval .= "<tr>\n";
        $retval .= "    <td>" . __('Table') . "</td>\n";
        $retval .= "    <td>\n";
        $retval .= "        <select name='item_table'>\n";
        foreach ($tables as $key => $value) {
            $selected = "";
            if ($mode == 'add' && $value == $table) {
                $selected = " selected='selected'";
            } elseif ($mode == 'edit' && $value == $item['item_table']) {
                $selected = " selected='selected'";
            }
            $retval .= "<option$selected>";
            $retval .= htmlspecialchars($value);
            $retval .= "</option>\n";
        }
        $retval .= "        </select>\n";
        $retval .= "    </td>\n";
        $retval .= "</tr>\n";
        $retval .= "<tr>\n";
        $retval .= "    <td>" . _pgettext('Trigger action time', 'Time') . "</td>\n";
        $retval .= "    <td><select name='item_timing'>\n";
        foreach ($action_timings as $key => $value) {
            $selected = "";
            if (! empty($item['item_action_timing'])
                && $item['item_action_timing'] == $value
            ) {
                $selected = " selected='selected'";
            }
            $retval .= "<option$selected>$value</option>";
        }
        $retval .= "    </select></td>\n";
        $retval .= "</tr>\n";
        $retval .= "<tr>\n";
        $retval .= "    <td>" . __('Event') . "</td>\n";
        $retval .= "    <td><select name='item_event'>\n";
        foreach ($event_manipulations as $key => $value) {
            $selected = "";
            if (! empty($item['item_event_manipulation'])
                && $item['item_event_manipulation'] == $value
            ) {
                $selected = " selected='selected'";
            }
            $retval .= "<option$selected>$value</option>";
        }
        $retval .= "    </select></td>\n";
        $retval .= "</tr>\n";
        $retval .= "<tr>\n";
        $retval .= "    <td>" . __('Definition') . "</td>\n";
        $retval .= "    <td><textarea name='item_definition' rows='15' cols='40'>";
        $retval .= $item['item_definition'];
        $retval .= "</textarea></td>\n";
        $retval .= "</tr>\n";
        $retval .= "<tr>\n";
        $retval .= "    <td>" . __('Definer') . "</td>\n";
        $retval .= "    <td><input type='text' name='item_definer'\n";
        $retval .= "               value='{$item['item_definer']}'></td>\n";
        $retval .= "</tr>\n";
        $retval .= "</table>\n";
        $retval .= "</fieldset>\n";
        if ($response->isAjax()) {
            $retval .= "<input type='hidden' name='editor_process_{$mode}'\n";
            $retval .= "       value='true'>\n";
            $retval .= "<input type='hidden' name='ajax_request' value='true'>\n";
        } else {
            $retval .= "<fieldset class='tblFooters'>\n";
            $retval .= "    <input type='submit' name='editor_process_{$mode}'\n";
            $retval .= "           value='" . __('Go') . "'>\n";
            $retval .= "</fieldset>\n";
        }
        $retval .= "</form>\n\n";
        $retval .= "<!-- END " . $modeToUpper . " TRIGGER FORM -->\n\n";

        return $retval;
    }

    /**
     * Composes the query necessary to create a trigger from an HTTP request.
     *
     * @return string  The CREATE TRIGGER query.
     */
    public function getQueryFromRequest()
    {
        global $db, $errors, $action_timings, $event_manipulations;

        $query = 'CREATE ';
        if (! empty($_POST['item_definer'])) {
            if (mb_strpos($_POST['item_definer'], '@') !== false
            ) {
                $arr = explode('@', $_POST['item_definer']);
                $query .= 'DEFINER=' . Util::backquote($arr[0]);
                $query .= '@' . Util::backquote($arr[1]) . ' ';
            } else {
                $errors[] = __('The definer must be in the "username@hostname" format!');
            }
        }
        $query .= 'TRIGGER ';
        if (! empty($_POST['item_name'])) {
            $query .= Util::backquote($_POST['item_name']) . ' ';
        } else {
            $errors[] = __('You must provide a trigger name!');
        }
        if (! empty($_POST['item_timing'])
            && in_array($_POST['item_timing'], $action_timings)
        ) {
            $query .= $_POST['item_timing'] . ' ';
        } else {
            $errors[] = __('You must provide a valid timing for the trigger!');
        }
        if (! empty($_POST['item_event'])
            && in_array($_POST['item_event'], $event_manipulations)
        ) {
            $query .= $_POST['item_event'] . ' ';
        } else {
            $errors[] = __('You must provide a valid event for the trigger!');
        }
        $query .= 'ON ';
        if (! empty($_POST['item_table'])
            && in_array($_POST['item_table'], $this->dbi->getTables($db))
        ) {
            $query .= Util::backquote($_POST['item_table']);
        } else {
            $errors[] = __('You must provide a valid table name!');
        }
        $query .= ' FOR EACH ROW ';
        if (! empty($_POST['item_definition'])) {
            $query .= $_POST['item_definition'];
        } else {
            $errors[] = __('You must provide a trigger definition.');
        }

        return $query;
    }
}