phantomknight287/aero

public

I LOVE THIS APPb7c0532a year ago122 lines · 3.5 KB

1	import 'package:timezone/timezone.dart' as tz;
2	import 'package:timezone/data/latest.dart' as tz;
3	import 'package:intl/intl.dart';
4
5	/// Calculates the duration of a flight between two timezones
6	///
7	/// Parameters:
8	/// - departureTime: Departure time string (supports ISO 8601 or custom format)
9	/// - departureTimezone: IANA timezone for departure (e.g., "America/Chicago")
10	/// - arrivalTime: Arrival time string
11	/// - arrivalTimezone: IANA timezone for arrival (e.g., "America/Los_Angeles")
12	/// - dateFormat: Optional custom format for parsing times
13	///
14	/// Returns Duration representing the flight time
15	Duration calculateFlightDuration({
16	required String departureTime,
17	required String departureTimezone,
18	required String arrivalTime,
19	required String arrivalTimezone,
20	String? dateFormat,
21	}) {
22	// Initialize timezone database
23	try {
24	tz.initializeTimeZones();
25	} catch (e) {
26	throw TimeZoneInitException('Failed to initialize timezone database: $e
27	}
28	try {
29	// Parse times using appropriate method
30	final parsedDeparture = _parseDateTime(departureTime
31	final parsedArrival = _parseDateTime(arrivalTime
32
33	// Get timezone locations
34	final departureLocation = tz.getLocation
35	final arrivalLocation = tz.getLocation
36
37	// Convert to TZDateTime for each timezone
38	final tzDeparture = tz.TZDateTime
39	final tzArrival = tz.TZDateTime
40
41	// Calculate duration
42	final duration = tzArrival.difference
43
44
45	return duration;
46	} on tz.LocationNotFoundException catch (e) {
47	throw TimeZoneNotFoundException('Invalid timezone identifier provided: $e
48	} catch (e) {
49	rethrow; // Preserve specific exception types
50	}
51	}
52
53	/// Helper function to parse datetime strings in various formats
54	DateTime _parseDateTime(String dateStr
55	try {
56	// First try parsing as ISO 8601
57	return DateTime.parse
58	} catch (_) {
59	// If ISO parsing fails and format is provided, try using the format
60	if (format != null) {
61	try {
62	return DateFormat(format).parse
63	} catch (e) {
64	throw DateParseException('Could not parse "$dateStr
65	'Please check the time format and try again.');
66	}
67	}
68
69	// If no format provided, try common formats
70	final commonFormats = [
71	"yyyy-MM-dd HH:mm",
72	"yyyy-MM-dd hh:mm a",
73	"MM/dd/yyyy HH:mm",
74	"dd-MM-yyyy HH:mm",
75	];
76
77	for (final fmt in commonFormats) {
78	try {
79	return DateFormat(fmt).parse
80	} catch (_) {
81	continue;
82	}
83	}
84
85	throw DateParseException('Could not parse "$dateStr
86	'(e.g., "2024-12-28T10:07:00Z") or specify a custom format.');
87	}
88	}
89
90	/// Custom exception for invalid flight times
91	class FlightTimeException implements Exception
92	final String message;
93	FlightTimeException(this.message);
94
95	@override
96	String toString() => message
97	}
98
99	/// Other exception classes
100	class DateParseException implements Exception
101	final String message;
102	DateParseException(this.message);
103
104	@override
105	String toString() => message
106	}
107
108	class TimeZoneInitException implements Exception
109	final String message;
110	TimeZoneInitException(this.message);
111
112	@override
113	String toString() => message
114	}
115
116	class TimeZoneNotFoundException implements Exception
117	final String message;
118	TimeZoneNotFoundException(this.message);
119
120	@override
121	String toString() => message
122	}