import 'dart:async';
import 'dart:convert';
import 'dart:io';

import 'package:get/get.dart';
import 'package:sen_pt/app/data/apiVar.dart';
import 'package:sen_pt/app/data/models/analysis_models.dart';
import 'package:sen_pt/app/data/models/inputLink_models.dart';

class AnalysisProvider extends GetConnect {
  // Buat job baru
  Future<AnalysisJob?> createJob(Map<String, dynamic> payload) async {
    final response = await post(analyzeUrl, payload);

    if (response.status.hasError) {
      print('Error: ${response.body}');
      return null;
    }

    return AnalysisJob.fromJson(response.body);
  }

  Future<AnalysisJob?> createJobVader(Map<String, dynamic> payload) async {
    final response = await post(analyzeUrlVader, payload);

    if (response.status.hasError) {
      print('Error: ${response.body}');
      return null;
    }

    return AnalysisJob.fromJson(response.body);
  }

  // Dapatkan progress
  Stream<AnalysisProgress> getProgress(String jobId) {
    final controller = StreamController<AnalysisProgress>.broadcast();

    bool canceled = false;
    String? lastKey;
    void emitOnce(AnalysisProgress p) {
      // Include result signature in the dedupe key to differentiate
      // between an earlier terminal tick without result and a later
      // terminal tick that includes the final result payload.
      final resultSig = (p.result == null)
          ? 'nores'
          : 'res:${p.result!.count}:${p.result!.categoryEncoded}:${p.result!.category}';
      final resumeSig =
          'resume:${p.resume.positif}:${p.resume.negatif}:${p.resume.topPhrasesPositif.length}:${p.resume.topPhrasesNegatif.length}';
      final key =
          '${p.ts.toIso8601String()}|${p.percent}|${p.message}|$resultSig|$resumeSig';
      if (key == lastKey) return;
      lastKey = key;
      controller.add(p);
    }

    controller.onCancel = () {
      canceled = true;
    };

    Future<void> connect({int attempt = 0}) async {
      if (canceled) return;
      final client = HttpClient();
      try {
        final request = await client.getUrl(Uri.parse('$progressUrl/$jobId'));
        request.headers.set(HttpHeaders.acceptHeader, 'text/event-stream');
        final response = await request.close();

        final buffer = StringBuffer();
        final dataEvent = StringBuffer();

        void processBuffer() {
          final text = buffer.toString();
          final lines = text.split('\n');
          final lastComplete = text.endsWith('\n');
          buffer.clear();

          for (var i = 0; i < lines.length; i++) {
            final line = lines[i].trimRight();
            final isLast = i == lines.length - 1;
            if (isLast && !lastComplete) {
              buffer.write(line);
              break;
            }

            if (line.isEmpty) {
              if (dataEvent.isNotEmpty) {
                final payload = dataEvent.toString();
                dataEvent.clear();
                try {
                  print('SSE payload: $payload');
                  final map = jsonDecode(payload) as Map<String, dynamic>;
                  final progress = AnalysisProgress.fromJson(map);
                  print(
                    'Parsed progress: ${progress.percent} - ${progress.message}',
                  );
                  emitOnce(progress);
                  // Stop reconnecting on terminal states
                  final st = progress.status.toLowerCase();
                  if (progress.percent >= 100 ||
                      st == 'completed' ||
                      st == 'failed') {
                    canceled = true;
                  }
                } catch (e) {
                  print('SSE parse error: $e');
                }
              }
              continue;
            }

            if (line.startsWith('data:')) {
              final content = line.substring(5).trimLeft();
              if (dataEvent.isNotEmpty) dataEvent.write('\n');
              dataEvent.write(content);
            } else {
              if (dataEvent.isNotEmpty) dataEvent.write('\n');
              dataEvent.write(line);
            }
          }
        }

        late StreamSubscription<List<int>> sub;
        sub = response.listen(
          (chunk) {
            buffer.write(utf8.decode(chunk, allowMalformed: true));
            processBuffer();
          },
          onError: (e, st) async {
            print('SSE error: $e');
            await sub.cancel();
            if (!canceled) {
              final delay = Duration(
                milliseconds: (1000 * (1 << (attempt > 5 ? 5 : attempt))),
              );
              print(
                'Reconnecting SSE in ${delay.inMilliseconds} ms (attempt ${attempt + 1})',
              );
              await Future.delayed(delay);
              connect(attempt: attempt + 1);
            }
          },
          onDone: () async {
            buffer.write('\n');
            processBuffer();
            // Flush remaining event
            if (dataEvent.isNotEmpty) {
              final payload = dataEvent.toString();
              dataEvent.clear();
              try {
                print('Final SSE payload: $payload');
                final map = jsonDecode(payload) as Map<String, dynamic>;
                final progress = AnalysisProgress.fromJson(map);
                print(
                  'Final parsed progress: ${progress.percent} - ${progress.message}',
                );
                emitOnce(progress);
              } catch (e) {
                print('Final SSE parse error: $e');
              }
            }
            if (!canceled) {
              final delay = Duration(
                milliseconds: (1000 * (1 << (attempt > 5 ? 5 : attempt))),
              );
              print(
                'SSE done, reconnecting in ${delay.inMilliseconds} ms (attempt ${attempt + 1})',
              );
              await Future.delayed(delay);
              connect(attempt: attempt + 1);
            }
          },
          cancelOnError: true,
        );

        controller.onCancel = () async {
          canceled = true;
          await sub.cancel();
        };
      } catch (e) {
        print('SSE connect error: $e');
        if (!canceled) {
          final delay = Duration(
            milliseconds: (1000 * (1 << (attempt > 5 ? 5 : attempt))),
          );
          print(
            'Reconnect after error in ${delay.inMilliseconds} ms (attempt ${attempt + 1})',
          );
          await Future.delayed(delay);
          connect(attempt: attempt + 1);
        }
      }
    }

    // kick off first connection
    connect();

    return controller.stream;
  }
}