from django.db import models

from apps.core.models import TimeStampedModel, UUIDModel
from apps.live_monitoring.protocols import DEFAULT_PROTOCOL, PROTOCOL_CHOICES


class Camera(UUIDModel, TimeStampedModel):
    name = models.CharField(max_length=200)
    facility = models.CharField(max_length=200, blank=True)
    processing_line = models.CharField(max_length=200, blank=True)
    # Blank = inherit camera.default_protocol from Live Monitoring settings.
    protocol = models.CharField(
        max_length=32,
        choices=PROTOCOL_CHOICES,
        blank=True,
        default="",
        help_text="Streaming standard. Leave blank to use the system default protocol.",
    )
    # CharField (not URLField) so RTSP/RTMP/SRT URLs are accepted.
    stream_url = models.CharField(max_length=1000)
    # Never expose credentials to the frontend; keep auth config server-side.
    # Expected keys: username, password, token, auth_method, host, port, path, transport…
    auth_config = models.JSONField(default=dict, blank=True)
    active = models.BooleanField(default=True)

    def __str__(self) -> str:
        return self.name

    def resolved_protocol(self) -> str:
        if self.protocol:
            return self.protocol
        from apps.core.settings_service import SettingsService

        value = SettingsService().get("camera.default_protocol", DEFAULT_PROTOCOL)
        return value if value in dict(PROTOCOL_CHOICES) else DEFAULT_PROTOCOL


class LiveStream(UUIDModel, TimeStampedModel):
    camera = models.ForeignKey(Camera, on_delete=models.CASCADE, related_name="streams")
    name = models.CharField(max_length=200, blank=True)
    active = models.BooleanField(default=True)

    def __str__(self) -> str:
        return self.name or self.camera.name


class WorkflowStepCamera(UUIDModel):
    step = models.ForeignKey("workflows.WorkflowStep", on_delete=models.CASCADE, related_name="cameras")
    camera = models.ForeignKey(Camera, on_delete=models.CASCADE, related_name="workflow_steps")