import 'dart:developer';

import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter_rust_bridge/flutter_rust_bridge_for_generated_io.dart';
import 'package:flutter_rust_bridge/flutter_rust_bridge_for_generated.dart';
import 'package:timetracker/src/rust/api.dart';
import 'package:timetracker/src/rust/frb_generated.dart';

int dateTimeToUnixSeconds(DateTime dt) =>
    dt.toUtc().millisecondsSinceEpoch ~/ 1000;
DateTime unixSecondsToDateTime(int ts) =>
    DateTime.fromMillisecondsSinceEpoch(ts * 1000, isUtc: true).toLocal();

class TimeTrackingService extends ChangeNotifier {
  // final RustLibApi api;
  bool _isInitialized = false;
  bool _isLoading = true;
  TimeEntry? _currentTracking;
  List<Tag> _tags = [];

  bool get isInitialized => _isInitialized;
  bool get isLoading => _isLoading;
  TimeEntry? get currentTracking => _currentTracking;
  List<Tag> get tags => _tags;

  // TimeTrackingService({required this.api}) {
  TimeTrackingService() {
    _loadInitialData();
  }

  Future<void> _loadInitialData() async {
    _isLoading = true;
    _isInitialized = false;
    notifyListeners();
    try {
      _currentTracking = await getLastUnfinishedTracking();
      _tags = await getTags();

      _isInitialized = true;
    } on FrbException catch (e) {
      _isInitialized = false;
      log("error loading initial data: $e");
    } catch (e) {
      log("unexpected error loading initial data: $e");
      _isInitialized = false;
    } finally {
      _isLoading = false;
      notifyListeners();
    }
  }

  Future<void> refreshData() async {
    await _loadInitialData();
  }

  Future<bool> flStartTracking(int? tagId) async {
    if (_currentTracking != null) {
      log("Cannot start tracking: Another tracking is already active.");
      return false;
    }
    final startTime = DateTime.now();

    try {
      final newEntryId = await startTracking(
        tagId: tagId,
        startTimeUnixTs: dateTimeToUnixSeconds(startTime),
      );
      log("Tracking started with new ID: $newEntryId");
      await _loadInitialData();
      return true;
    } on FrbException catch (e) {
      log("Error starting tracking: $e");
      return false;
    } catch (e) {
      log("Unexpected error starting tracking: $e");
      return false;
    }
  }

  Future<bool> flStopTracking() async {
    if (_currentTracking == null) {
      log("Cannot stop tracking: No tracking is active.");
      return false;
    }
    final endTime = DateTime.now();
    final entryIdToStop = _currentTracking!.id;

    try {
      await stopTracking(
        entryId: entryIdToStop,
        endTimeUnixTs: dateTimeToUnixSeconds(endTime),
      );
      log("Tracking stopped for ID: $entryIdToStop");
      await _loadInitialData();
      return true;
    } on FrbException catch (e) {
      log("Error stopping tracking: $e");
      return false;
    } catch (e) {
      log("Unexpected error stopping tracking: $e");
      return false;
    }
  }

  Future<bool> flCreateTag(String name) async {
    if (name.trim().isEmpty) {
      log("Cannot create tag: Name is empty.");
      return false;
    }
    final trimmedName = name.trim();

    try {
      final tagId = await createTag(name: trimmedName);
      log("Tag created with ID: $tagId");
      _tags = await getTags();
      notifyListeners();
      return true;
    } on FrbException catch (e) {
      log("Error creating tag: $e");
      return false;
    } catch (e) {
      log("Unexpected error creating tag: $e");
      return false;
    }
  }

  Future<ReportData?> flGetReport(
    int? tagId,
    DateTime start,
    DateTime end,
  ) async {
    try {
      final report = await generateReport(
        tagIdFilter: tagId,
        startDateUnixTs: dateTimeToUnixSeconds(start),
        endDateUnixTs: dateTimeToUnixSeconds(end),
      );
      return report;
    } on FrbException catch (e) {
      log("Error generating report: $e");
      return null;
    } catch (e) {
      log("Unexpected error generating report: $e");
      return null;
    }
  }

  Future<bool> flUpdateTimeEntry({
    required int entryId,
    required int? tagId,
    required DateTime startTime,
    required DateTime? endTime,
  }) async {
    try {
      await updateTimeEntry(
        entryId: entryId,
        newTagId: tagId,
        newStartTimeUnixTs: dateTimeToUnixSeconds(startTime),
        newEndTimeUnixTs: dateTimeToUnixSeconds(endTime!),
      );
      log("Time entry $entryId updated successfully via service.");
      return true;
    } on FrbException catch (e) {
      log("Error updating time entry $entryId: $e");
      return false;
    } catch (e) {
      log("Unexpected error updating time entry $entryId: $e");
      return false;
    }
  }

  Future<bool> flDeleteTimeEntry(int entryId) async {
    log('Service: Attempting to delete entry $entryId');
    try {
      await deleteTimeEntry(id: entryId);
      log('Service: Successfully deleted entry $entryId');
      return true;
    } on FrbException catch (e, s) {
      log('Service: Error deleting entry $entryId: $e\n$s');
      return false;
    } catch (e, s) {
      log('Service: Unexpected error deleting entry $entryId: $e\n$s');
      return false;
    }
  }
}