<?php
declare(strict_types=1);

namespace Soon\Api\Controllers;

use Soon\Api\Core\Json;
use Soon\Api\Middleware\Auth;
use Soon\Api\Services\FileService;
use Soon\Api\Services\MembershipService;

final class FileController
{
    public function index(): void
    {
        $u = Auth::require();
        $page = max(1, (int)($_GET['page'] ?? 0));
        $size = max(1, min(200, (int)($_GET['size'] ?? 0)));
        $limit = $size > 0 ? $size : max(1, min(200, (int)($_GET['limit'] ?? 50)));
        $offset = $page > 0 ? ($page - 1) * $limit : max(0, (int)($_GET['offset'] ?? 0));
        if ($page > 0) {
            $list = FileService::list($u['id'], $limit, $offset);
            Json::ok([
                'items' => $list,
                'total' => FileService::fileCount($u['id']),
                'page' => $page,
                'size' => $limit,
            ]);
            return;
        }
        $list = FileService::list($u['id'], $limit, $offset);
        Json::ok([
            'items' => $list,
            'total' => FileService::fileCount($u['id']),
            'limit' => $limit,
            'offset' => $offset,
        ]);
    }

    public function create(): void
    {
        $u = Auth::require();
        MembershipService::requireActiveMember($u['id']);
        $body = Json::readBody();
        $name = (string)($body['name'] ?? 'untitled.soon');
        $json = (string)($body['json'] ?? '{}');
        Json::ok(FileService::create($u['id'], $name, $json));
    }

    public function update(int $id): void
    {
        $u = Auth::require();
        MembershipService::requireActiveMember($u['id']);
        $body = Json::readBody();
        $name = (string)($body['name'] ?? 'untitled.soon');
        $json = (string)($body['json'] ?? '{}');
        $version = isset($body['version']) ? (int)$body['version'] : null;
        Json::ok(FileService::update($u['id'], $id, $name, $json, $version));
    }

    public function delete(int $id): void
    {
        $u = Auth::require();
        FileService::softDelete($u['id'], $id);
        Json::ok(['id' => $id]);
    }

    public function download(int $id): void
    {
        $u = Auth::require();
        $accept = (string)($_SERVER['HTTP_ACCEPT'] ?? '');
        $jsonRead = stripos($accept, 'application/json') !== false
            && stripos($accept, 'application/octet-stream') === false;
        if (!$jsonRead) {
            MembershipService::requireActiveMember($u['id']);
        }
        $row = FileService::fetch($u['id'], $id);
        $name = (string)$row['name'];
        $json = (string)$row['json'];
        $size = strlen($json);
        $etag = '"' . md5($json) . '"';
        if (isset($_SERVER['HTTP_IF_NONE_MATCH']) && trim($_SERVER['HTTP_IF_NONE_MATCH']) === $etag) {
            http_response_code(304);
            exit;
        }
        header('Content-Type: application/octet-stream');
        header('Content-Disposition: attachment; filename="' . rawurlencode($name) . '"');
        header('Content-Length: ' . $size);
        header('ETag: ' . $etag);
        header('Accept-Ranges: bytes');
        header('Cache-Control: private, max-age=0, must-revalidate');
        $start = 0;
        $end = $size - 1;
        if (isset($_SERVER['HTTP_RANGE']) && preg_match('/bytes=(\d+)-(\d*)/', $_SERVER['HTTP_RANGE'], $m)) {
            $start = (int)$m[1];
            if ($m[2] !== '') $end = (int)$m[2];
            if ($end >= $size) $end = $size - 1;
            http_response_code(206);
            header('Content-Range: bytes ' . $start . '-' . $end . '/' . $size);
            header('Content-Length: ' . ($end - $start + 1));
        }
        $out = fopen('php://output', 'wb');
        fwrite($out, substr($json, $start, $end - $start + 1));
        fclose($out);
        exit;
    }
}