<?php

namespace sammo;

include "lib.php";
include "func.php";

try {
    $input = json_decode(file_get_contents('php://input'));
} catch (\Exception $e) {
    Json::dieWithReason($e->getMessage());
}

if (!key_exists('path', $input)) {
    Json::dieWithReason('path가 지정되지 않았습니다.');
}

if (key_exists('args', $input) && !is_array($input['args'])) {
    Json::dieWithReason('args가 array가 아닙니다.' . gettype($input['args']));
}

try {
    $obj = buildAPIExecutorClass($input['path'], $input['args'] ?? []);
    $api =
        $validateResult = $obj->validateArgs();
    if ($validateResult !== null) {
        Json::dieWithReason($validateResult);
    }

    $sessionMode = $obj->getRequiredSessionMode();
    if ($sessionMode === BaseAPI::NO_SESSION) {
        $session = null;
    } else {
        if ($sessionMode & BaseAPI::REQ_GAME_LOGIN) {
            $session = Session::requireGameLogin();
        } else if ($sessionMode & BaseAPI::REQ_LOGIN) {
            $session = Session::requireLogin();
        } else {
            Json::dieWithReason("올바르지 않은 SessionMode: {$sessionMode}");
        }

        if ($sessionMode & BaseAPI::REQ_READ_ONLY) {
            $session->setReadOnly();
        }
    }

    $modifiedSince = isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])
        ? new \DateTimeImmutable($_SERVER['HTTP_IF_MODIFIED_SINCE'], new \DateTimeZone("UTC"))
        : null;
    $reqEtags = isset($_SERVER['HTTP_IF_NONE_MATCH']) ? trim($_SERVER['HTTP_IF_NONE_MATCH']) : null;

    $result = $obj->launch($session, $modifiedSince, $reqEtags);
    if (is_string($result)) {
        Json::dieWithReason($result);
    }

    $cacheResult = $obj->tryCache();
    if ($cacheResult !== null) {
        /** @var \DateTimeInterface $lastModified  */
        [$lastModified, $etag] = $cacheResult;

        if ($lastModified !== null) {
            header("Last-Modified: " . gmdate("D, d M Y H:i:s", TimeUtil::DateTimeToSeconds($lastModified, true)) . " GMT");
        }
        if ($etag !== null) {
            header("Etag: $etag");
        }

        if ($modifiedSince !== null && $lastModified !== null && TimeUtil::DateIntervalToSeconds($modifiedSince->diff($lastModified)) == 0) {
            header("HTTP/1.1 304 Not Modified");
            die();
        }
        if ($reqEtags !== null && $reqEtags === $etag) {
            header("HTTP/1.1 304 Not Modified");
            die();
        }
    }

    if ($result === null) {
        Json::die([
            'result' => true,
            'reason' => 'success'
        ], $cacheResult === null ? Json::NO_CACHE : 0);
    }
    Json::die($result, $cacheResult === null ? Json::NO_CACHE : 0);
} catch (\Exception $e) {
    Json::dieWithReason($e->getMessage());
} catch (mixed $e) {
    Json::dieWithReason($e);
}