152 lines
5.3 KiB
Plaintext
152 lines
5.3 KiB
Plaintext
from django.db import models
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from .carrier import Carrier
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from .aircraft import Equipment
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from .aerodrome import Aerodrome
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from django.core.validators import MinValueValidator, MaxValueValidator
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from simulator.utils import haversine_nm
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from datetime import timedelta
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from django.core.exceptions import ValidationError
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from django.utils import timezone
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from decimal import Decimal
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class Flight(models.Model):
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carrier = models.ForeignKey(
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Carrier, on_delete=models.CASCADE, related_name="flights"
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)
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equipment = models.ForeignKey(
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Equipment, on_delete=models.CASCADE, related_name="flights"
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)
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origin = models.ForeignKey(
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Aerodrome, on_delete=models.CASCADE, related_name="departures"
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)
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destination = models.ForeignKey(
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Aerodrome, on_delete=models.CASCADE, related_name="arrivals"
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)
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flight_number = models.PositiveIntegerField(
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validators=[MinValueValidator(1), MaxValueValidator(9999)]
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)
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departure_time = models.DateTimeField()
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canceled = models.BooleanField(default=False)
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class Meta:
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constraints = [
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models.UniqueConstraint(
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fields=["carrier", "flight_number"], name="unique_flight_per_carrier"
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)
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]
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def __str__(self):
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return f"{self.carrier.icao}{self.flight_number} {self.origin.icao} > {self.destination.icao}"
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@property
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def distance_nm(self) -> float:
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return haversine_nm(
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self.origin.latitude,
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self.origin.longitude,
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self.destination.latitude,
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self.destination.longitude,
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)
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@property
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def duration(self) -> timedelta:
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speed = self.equipment.model.cruise_speed_kt
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hours = self.distance_nm / speed
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return timedelta(hours=hours)
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@property
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def arrival_time(self):
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return self.departure_time + self.duration
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def clean(self):
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if self.origin == self.destination:
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raise ValidationError("Origin and destination airports cannot be the same.")
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if self.equipment.owner != self.carrier:
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raise ValidationError(
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f"{self.equipment} is owned by {self.equipment.owner}, "
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f"not {self.carrier}. Cannot assign equipment to this flight."
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)
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if self.distance_nm > self.equipment.model.range_nm:
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raise ValidationError(
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f"Flight distance ({self.distance_nm:.0f} nm) exceeds {self.equipment.model} "
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f"maximum range ({self.equipment.model.range_nm} nm)."
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)
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previous_flights = Flight.objects.filter(
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equipment=self.equipment,
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departure_time__lt=self.departure_time,
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canceled=False,
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).exclude(pk=self.pk)
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previous_flight = None
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latest_arrival = None
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for flight in previous_flights:
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if latest_arrival is None or flight.arrival_time > latest_arrival:
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latest_arrival = flight.arrival_time
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previous_flight = flight
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if previous_flight:
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if previous_flight.destination != self.origin:
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raise ValidationError(
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f"{self.equipment} will be at {previous_flight.destination.icao} "
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f"after flight {previous_flight.carrier.icao}{previous_flight.flight_number}. "
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f"Cannot depart from {self.origin.icao}."
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)
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if previous_flight.arrival_time > self.departure_time:
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raise ValidationError(
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f"{self.equipment} arrives at {self.origin.icao} at {previous_flight.arrival_time}. "
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f"Cannot depart before arrival."
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)
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else:
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if (
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self.equipment.base_location
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and self.equipment.base_location != self.origin
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):
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raise ValidationError(
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f"{self.equipment} is based at {self.equipment.base_location.icao}. "
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f"First flight must depart from base location, not {self.origin.icao}."
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)
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arrival = self.arrival_time
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@property
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def status(self):
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if self.canceled:
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return "Canceled"
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now = timezone.now()
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if now < self.departure_time:
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return "Scheduled"
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elif self.departure_time <= now < self.arrival_time:
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return "In-Flight"
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else:
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return "Arrived"
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def save(self, *args, **kwargs):
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"""Override save to update equipment cycles and air time when flight completes."""
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is_new = self.pk is None
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super().save(*args, **kwargs)
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if not is_new and self.status == "Arrived":
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if not hasattr(self, "_stats_updated"):
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flight_hours = Decimal(str(self.duration.total_seconds() / 3600))
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self.equipment.cycles += 1
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self.equipment.air_time_hours += flight_hours
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self.equipment.save(update_fields=["cycles", "air_time_hours"])
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self._stats_updated = True
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class Route(models.Model):
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"""regulary scheduled flights"""
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carrier = models.ForeignKey(
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Carrier, on_delete=models.CASCADE, related_name="routes"
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)
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name = models.CharField()
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days_of_week = models.JSONField(
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default=list, help_text="[0,1,2,3,4] for weekdays, [5,6] for weekends, etc"
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)
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