import 'dart:io';

import 'package:client_proxy_framework/client_proxy_framework.dart';
import 'package:http/http.dart' as http;

/// PUT 到 [FeedbackApi.getUploadPresignedUrl] 返回的地址，返回服务端 [FeedbackUploadPresignedUrlResponse.filePath] 供 [FeedbackApi.submit] 的 `fileUrls`。
Future<String> uploadFeedbackAttachment(File file) async {
  final name = file.path.split('/').last;
  final presignedRes = await FeedbackApi.getUploadPresignedUrl(fileName: name);
  if (!presignedRes.isSuccess || presignedRes.data == null) {
    throw StateError(
      presignedRes.msg.isNotEmpty
          ? presignedRes.msg
          : 'Could not get upload URL',
    );
  }
  final p = presignedRes.data!;
  final uploadUrl = p.uploadUrl;
  final filePath = p.filePath;
  if (uploadUrl == null ||
      uploadUrl.isEmpty ||
      filePath == null ||
      filePath.isEmpty) {
    throw StateError('Invalid upload URL response');
  }

  final bytes = await file.readAsBytes();
  final contentType = _mimeForPath(file.path);
  final headers = <String, String>{'Content-Type': contentType};
  final extra = p.putHeaders;
  if (extra != null) {
    for (final e in extra.entries) {
      final k = e.key.trim();
      if (k.isEmpty) continue;
      headers[k] = e.value.toString();
    }
  }
  if (!headers.containsKey('Content-Type')) {
    headers['Content-Type'] = contentType;
  }

  final r = await http.put(
    Uri.parse(uploadUrl),
    headers: headers,
    body: bytes,
  );
  if (r.statusCode < 200 || r.statusCode >= 300) {
    throw StateError('Upload failed (${r.statusCode})');
  }
  return filePath;
}

String _mimeForPath(String path) {
  final lower = path.toLowerCase();
  if (lower.endsWith('.png')) return 'image/png';
  if (lower.endsWith('.gif')) return 'image/gif';
  if (lower.endsWith('.webp')) return 'image/webp';
  return 'image/jpeg';
}