<?php

class Cities extends Base {

    // Variables

    private $current_user_serial = 0;
    private $current_user_id     = "";
    private $current_user_name   = "";
    private $current_user_email  = "";
    private $pagination_size     = 20;
    private $pagination_page     = 1;

    // =================
    // Class Constructor
    // =================

    public function __construct() {

        set_error_handler(array($this, "displayError"));

        date_default_timezone_set(self::TIMEZONE);

        $this->current_user_serial = $_SESSION[self::USER_SERIAL] ?? 0;
        $this->current_user_id     = $_SESSION[self::USER_ID] ?? "";
        $this->current_user_name   = $_SESSION[self::USER_NAME] ?? "";
        $this->current_user_email  = $_SESSION[self::USER_EMAIL] ?? "";

        $this->pagination_page     = $_SESSION[self::PAGINATION_PAGE] ?? 1;
    }

    // ============
    // Setup Cities
    // ============

    public function setupCities() {

        $cities = $this->getCitiesPage();
        $popovers = (new Popovers())->getPopovers();

        $XML = $this->mergeXML($cities, "<XML/>");
        $XML = $this->mergeXML($popovers, $XML);

        $content = $this->applyXSL($XML, $this->getXSL("setupCities"));

        $this->displayContent($content);
    }

    // ========
    // Add City
    // ========

    public function addCity() {

        $step = filter_input(INPUT_POST, "step") ?: "prompt";

        switch ($step) {

            case "prompt":

                $constants = $this->getConstants();

                $content   = $this->applyXSL($constants, $this->getXSL("addCity"));

                $this->displayContent($content);

                break;

            case "add":

                $city_name  = filter_input(INPUT_POST, "city_name") ?: "";
                $city_state = filter_input(INPUT_POST, "city_state") ?: "";

                $SQL = "insert into cities
          
                         (  city_name,
                            city_state,
                            city_creator,
                            city_created )
                               
                  VALUES ( :city_name,
                           :city_state,
                           :city_creator,
                           :city_created )";

                $statement = $this->connect()->prepare($SQL);

                $statement->bindValue(":city_name",    $city_name);
                $statement->bindValue(":city_state",   $city_state);
                $statement->bindValue(":city_creator", $this->current_user_name);
                $statement->bindValue(":city_created", $this->getTimestamp());

                $statement->execute();

                break;

            default:

                $this->displayHome();
        }
    }

    // ===========
    // Edit a City
    // ===========

    public function editCity() {

        $step = filter_input(INPUT_POST, "step") ?: "prompt";

        switch ($step) {

            case "prompt":

                $city_serial = filter_input(INPUT_POST, "city_serial", FILTER_SANITIZE_NUMBER_INT) ?: 0;

                $city = $this->getCity($city_serial);

                if ($city->count() == 0) {
                    $this->logError("Invalid City ({$city_serial}). " . __METHOD__);
                }

                $constants = $this->getConstants();

                $XML = $this->mergeXML($city, "<XML/>");
                $XML = $this->mergeXML($constants, $XML);

                $content = $this->applyXSL($XML, $this->getXSL("editCity"));

                $this->displayContent($content);

                break;

            case "update":

                $city_serial = filter_input(INPUT_POST, "city_serial", FILTER_SANITIZE_NUMBER_INT) ?: 0;
                $city_name   = filter_input(INPUT_POST, "city_name")                               ?: "";
                $city_state  = filter_input(INPUT_POST, "city_state")                              ?: "";

                // Verify the Cities

                $city = $this->getCity($city_serial);

                if ($city->count() == 0) {
                    $this->logError("Invalid Cities ({$city_serial}). " . __METHOD__);
                }

                $SQL = "update cities 
                           set city_name        = :city_name,
                               city_state       = :city_state,
                               city_changer     = :city_changer,
                               city_changed     = :city_changed
                         where city_serial      = :city_serial";

                $statement = $this->connect()->prepare($SQL);

                $statement->bindValue(":city_serial",  $city_serial);
                $statement->bindValue(":city_state",   $city_state);
                $statement->bindValue(":city_name",    $city_name);
                $statement->bindValue(":city_changer", $this->current_user_name);
                $statement->bindValue(":city_changed", $this->getTimestamp());

                $statement->execute();

                break;

            default:

                $this->displayHome();
        }
    }

    // ===========
    // Delete City
    // ===========

    public function deleteCity() {

        $city_serial = filter_input(INPUT_POST, "city_serial", FILTER_SANITIZE_NUMBER_INT) ?: 0;

        $city = $this->getCity($city_serial);

        if ($city->count() == 0) {
            $this->logError("Invalid City ({$city_serial}). " . __METHOD__);
        }

        $SQL = "delete from cities where city_serial = {$city_serial}";

        $this->executeSQL($SQL);
    }

    // =======================
    // Return an Cities Object
    // =======================

    public function getCity($city_serial = 0) {

        $SQL = "select view_cities.*
                  from view_cities
                 where city_serial = {$city_serial}";

        return $this->getTable("cities", $SQL);
    }

    // ======================
    // Return a Cities Object
    // ======================

    public function getCities() {

        $SQL = "select view_cities.* 
                  from view_cities
              order by view_cities.city_name";

        return $this->getTable("cities", $SQL);
    }

    // ===========================
    // Return a Cities Page Object
    // ===========================

    public function getCitiesPage() {

        // Find Criteria

        $find_city  = filter_input(INPUT_POST, "find_city") ?: "";
        $find_city  = $this->sanitizeString($find_city);

        $find_words = implode("|", explode(" ", $find_city));

        // Record Count

        $connection = $this->connect();

        $SQL = "select count(*) as count
                  from view_cities
                 where city_name    regexp :city_name
                    or city_state   regexp :city_state";

        $statement = $connection->prepare($SQL);

        $statement->bindValue(":city_name", $find_words);
        $statement->bindValue(":city_state", $find_words);

        $statement->execute();

        $recordset = $statement->fetch(PDO::FETCH_ASSOC);

        $count     = (count($recordset) > 0) ? (integer) $recordset["count"] : (integer) 0;

        // Pagination

        $pagination = filter_input(INPUT_POST, "pagination") ?: "";

        switch ($pagination) {

            case "first" : $this->pagination_page = 1;
                break;
            case "previous" : $this->pagination_page = max(($this->pagination_page - 1), 1);
                break;
            case "next" : $this->pagination_page = ($this->pagination_page + 1);
                break;
            case "last" : $this->pagination_page = ($count / $this->pagination_size);
                break;
        }

        $offset = (($this->pagination_page * $this->pagination_size) - $this->pagination_size);
        $start = ($offset + 1);
        $end = min($count, (($start + $this->pagination_size) - 1));

        // Data

        $SQL = "select view_cities.*
                  from view_cities
                 where city_name      regexp :city_name
                    or city_state     regexp :city_state
              order by city_code
                 limit {$this->pagination_size}
                offset {$offset}";

        $statement = $connection->prepare($SQL);

        $statement->bindValue(":city_name",  $find_words);
        $statement->bindValue(":city_state", $find_words);

        $statement->execute();

        $cities = $this->getTableXML("cities", $statement);

        // Insert Pagination Attributes

        $cities->addAttribute("count", $count);
        $cities->addAttribute("start", $start);
        $cities->addAttribute("end",   $end);
        $cities->addAttribute("page",  $this->pagination_page);

        $_SESSION[self::PAGINATION_PAGE] = $this->pagination_page;

        return $cities;
    }
}

?>