<?php

namespace Aowow;

if (!defined('AOWOW_REVISION'))
    die('illegal access');


abstract class WorldPosition
{
    private static array $alphaMapCache = [];
    private static array $capitalCities = array(        // capitals take precedence over their surrounding area
        1497, 1637, 1638, 3487,                         // Undercity,      Ogrimmar,  Thunder Bluff, Silvermoon City
        1519, 1537, 1657, 3557,                         // Stormwind City, Ironforge, Darnassus,     The Exodar
        3703, 4395                                      // Shattrath City, Dalaran
    );

    private static function alphaMapCheck(int $areaId, array &$set) : bool
    {
        $file = 'cache/alphaMaps/'.$areaId.'.png';
        if (!file_exists($file))                            // file does not exist (probably instanced area)
            return false;

        // invalid and corner cases (literally)
        if (empty($set['posX']) || empty($set['posY']) || $set['posX'] >= 100 || $set['posY'] >= 100)
        {
            $set = null;
            return true;
        }

        if (empty(self::$alphaMapCache[$areaId]))
            self::$alphaMapCache[$areaId] = imagecreatefrompng($file);

        // alphaMaps are 1000 x 1000, adapt points [black => valid point]
        if (!imagecolorat(self::$alphaMapCache[$areaId], $set['posX'] * 10, $set['posY'] * 10))
            $set = null;

        return true;
    }

    public static function checkZonePos(array $points) : array
    {
        $result   = [];

        foreach ($points as $res)
        {
            if (self::alphaMapCheck($res['areaId'], $res))
            {
                if (!$res)
                    continue;

                // some rough measure how central the spawn is on the map (the lower the number, the better)
                // 0: perfect center; 1: touches a border
                $q = abs( (($res['posX'] - 50) / 50) * (($res['posY'] - 50) / 50) );

                if (empty($result) || $result[0] > $q)
                    $result = [$q, $res];
            }
            // capitals (auto-discovered) and no hand-made alphaMap available
            else if (in_array($res['areaId'], self::$capitalCities))
                return $res;
            // add with lowest quality if alpha map is missing
            else if (empty($result))
                $result = [1.0, $res];
        }

        // spawn does not really match on a map, but we need at least one result
        if (!$result)
        {
            usort($points, function ($a, $b) { return ($a['dist'] < $b['dist']) ? -1 : 1; });
            $result = [1.0, $points[0]];
        }

        return $result[1];
    }

    public static function getForGUID(int $type, int ...$guids) : array
    {
        $result = [];

        switch ($type)
        {
            case Type::NPC:
                $result = DB::World()->select('SELECT `guid` AS ARRAY_KEY,              `id`, `map`         AS `mapId`, `position_x` AS `posX`, `position_y` AS `posY` FROM creature        WHERE `guid` IN (?a)', $guids);
                break;
            case Type::OBJECT:
                $result = DB::World()->select('SELECT `guid` AS ARRAY_KEY,              `id`, `map`         AS `mapId`, `position_x` AS `posX`, `position_y` AS `posY` FROM gameobject      WHERE `guid` IN (?a)', $guids);
                break;
            case Type::SOUND:
                $result = DB::AoWoW()->select('SELECT `id`   AS ARRAY_KEY, `soundId` AS `id`,                  `mapId`,                 `posX`,                 `posY` FROM ?_soundemitters WHERE `id`   IN (?a)', $guids);
                break;
            case Type::ZONE:
                $result = DB::Aowow()->select('SELECT -`id`  AS ARRAY_KEY,              `id`, `parentMapId` AS `mapId`, `parentX`    AS `posX`, `parentY`    AS `posY` FROM ?_zones         WHERE -`id`  IN (?a)', $guids);
                break;
            case Type::AREATRIGGER:
                $result = [];
                if ($base = array_filter($guids, fn($x) => $x > 0))
                    $result = array_replace($result, DB::AoWoW()->select('SELECT `id`   AS ARRAY_KEY, `id`,    `mapId`,                 `posX`,                 `posY` FROM ?_areatrigger   WHERE `id`   IN (?a)', $base));
                if ($endpoints = array_filter($guids, fn($x) => $x < 0))
                    $result = array_replace($result, DB::World()->select(
                       'SELECT -`ID`          AS ARRAY_KEY, ID          AS `id`,    `target_map` AS `mapId`, `target_position_x` AS `posX`, `target_position_y` AS `posY` FROM areatrigger_teleport WHERE -`id`          IN (?a) UNION
                        SELECT -`entryorguid` AS ARRAY_KEY, entryorguid AS `id`, `action_param1` AS `mapId`, `target_x`          AS `posX`, `target_y`          AS `posY` FROM smart_scripts        WHERE -`entryorguid` IN (?a) AND `source_type` = ?d AND `action_type` = ?d',
                        $endpoints, $endpoints, SmartAI::SRC_TYPE_AREATRIGGER, SmartAction::ACTION_TELEPORT
                     ));
                break;
            default:
                trigger_error('WorldPosition::getForGUID - unsupported TYPE #'.$type, E_USER_WARNING);
        }

        if ($diff = array_diff($guids, array_keys($result)))
            trigger_error('WorldPosition::getForGUID - no spawn points for TYPE #'.$type.' GUIDS: '.implode(', ', $diff), E_USER_WARNING);

        return $result;
    }

    public static function toZonePos(int $mapId, float $mapX, float $mapY, int $preferedAreaId = 0, int $preferedFloor = -1) : array
    {
        if (!$mapId < 0)
            return [];

        $query =
           'SELECT
                x.`id`,
                x.`areaId`,
                IF(x.`defaultDungeonMapId` < 0, x.`floor` + 1, x.`floor`) AS `floor`,
                IF(dm.`id` IS NOT NULL OR x.`defaultDungeonMapId` < 0, 1, 0) AS `multifloor`,
                ROUND((x.`maxY` - ?d) * 100 / (x.`maxY` - x.`minY`), 1) AS `posX`,
                ROUND((x.`maxX` - ?d) * 100 / (x.`maxX` - x.`minX`), 1) AS `posY`,
                SQRT(POWER(ABS((x.`maxY` - ?d) * 100 / (x.`maxY` - x.`minY`) - 50), 2) +
                     POWER(ABS((x.`maxX` - ?d) * 100 / (x.`maxX` - x.`minX`) - 50), 2)) AS `dist`
            FROM
                (SELECT 0 AS `id`, `areaId`,     `mapId`, `right` AS `minY`, `left` AS `maxY`, `top` AS `maxX`, `bottom` AS `minX`, 0 AS `floor`, 0 AS `worldMapAreaId`, `defaultDungeonMapId` FROM ?_worldmaparea wma UNION
                 SELECT   dm.`id`, `areaId`, wma.`mapId`,            `minY`,           `maxY`,          `maxX`,             `minX`,      `floor`,      `worldMapAreaId`, `defaultDungeonMapId` FROM ?_worldmaparea wma
                 JOIN   ?_dungeonmap dm ON dm.`mapId` = wma.`mapId` WHERE wma.`mapId` NOT IN (0, 1, 530, 571) OR wma.`areaId` = 4395) x
            LEFT JOIN
                ?_dungeonmap dm ON dm.`mapId` = x.`mapId` AND dm.`worldMapAreaId` = x.`worldMapAreaId` AND dm.`floor` <> x.`floor` AND dm.`worldMapAreaId` > 0
            WHERE
                x.`mapId` = ?d AND IF(?d, x.`areaId` = ?d, x.`areaId` <> 0){ AND x.`floor` = ?d - IF(x.`defaultDungeonMapId` < 0, 1, 0)}
            GROUP BY
                x.`id`, x.`areaId`
            HAVING
                (`posX` BETWEEN 0.1 AND 99.9 AND `posY` BETWEEN 0.1 AND 99.9)
            ORDER BY
                `multifloor` DESC, `dist` ASC';

        // dist BETWEEN 0 (center) AND 70.7 (corner)
        $points = DB::Aowow()->select($query, $mapY, $mapX, $mapY, $mapX, $mapId, $preferedAreaId, $preferedAreaId, $preferedFloor < 0 ? DBSIMPLE_SKIP : $preferedFloor);
        if (!$points)                                       // retry: pre-instance subareas belong to the instance-maps but are displayed on the outside. There also cases where the zone reaches outside it's own map.
            $points = DB::Aowow()->select($query, $mapY, $mapX, $mapY, $mapX, $mapId, 0, 0, DBSIMPLE_SKIP);
        if (!is_array($points))
        {
            trigger_error('WorldPosition::toZonePos - query failed', E_USER_ERROR);
            return [];
        }

        return $points;
    }
}

?>