import uuid

from django.conf import settings
from django.db import models


class CompletionMode(models.TextChoices):
    ONLINE = "online", "Online"
    OFFLINE = "offline", "Offline"
    BLENDED = "blended", "Blended"


class CompletionStatus(models.TextChoices):
    NOT_STARTED = "not_started", "Not Started"
    IN_PROGRESS = "in_progress", "In Progress"
    PENDING_SIGNOFF = "pending_signoff", "Pending Trainer Signoff"
    COMPLETED = "completed", "Completed"
    FAILED = "failed", "Failed"


class SignoffDecision(models.TextChoices):
    APPROVED = "approved", "Approved"
    REJECTED = "rejected", "Rejected"


class TrainingRecord(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    enrollment = models.OneToOneField("tracking.Enrollment", on_delete=models.CASCADE, related_name="training_record")
    completion_mode = models.CharField(max_length=20, choices=CompletionMode.choices, default=CompletionMode.ONLINE)
    status = models.CharField(max_length=20, choices=CompletionStatus.choices, default=CompletionStatus.NOT_STARTED)
    online_passed_at = models.DateTimeField(null=True, blank=True)
    completed_at = models.DateTimeField(null=True, blank=True)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        db_table = "training_record"


class TrainerSignoff(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    training_record = models.ForeignKey(TrainingRecord, on_delete=models.CASCADE, related_name="signoffs")
    trainer = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name="given_signoffs")
    decision = models.CharField(max_length=20, choices=SignoffDecision.choices)
    notes = models.TextField(blank=True)
    signed_off_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        db_table = "training_trainer_signoff"
        ordering = ["-signed_off_at"]


class SignoffEvidence(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    training_record = models.ForeignKey(TrainingRecord, on_delete=models.CASCADE, related_name="evidence")
    file_name = models.CharField(max_length=255)
    file_path = models.CharField(max_length=1000)
    uploaded_at = models.DateTimeField(auto_now_add=True)
    uploaded_by = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name="uploaded_evidence")

    class Meta:
        db_table = "training_signoff_evidence"


class AttendanceStatus(models.TextChoices):
    PRESENT = "present", "Present"
    ABSENT = "absent", "Absent"
    LATE = "late", "Late"


class Meeting(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    title = models.CharField(max_length=255)
    starts_at = models.DateTimeField()
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        db_table = "training_meeting"
        ordering = ["starts_at", "created_at"]


class MeetingParticipant(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    meeting = models.ForeignKey(Meeting, on_delete=models.CASCADE, related_name="participants")
    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name="meeting_participations")
    attendance_status = models.CharField(max_length=20, choices=AttendanceStatus.choices, null=True, blank=True)
    attendance_recorded_at = models.DateTimeField(null=True, blank=True)
    attendance_recorded_by = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True, blank=True, related_name="recorded_meeting_attendance")
    attendance_session = models.ForeignKey(
        "attendance.AttendanceSession",
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name="meeting_attendance_links",
    )
    created_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        db_table = "training_meeting_participant"
        constraints = [models.UniqueConstraint(fields=["meeting", "user"], name="training_unique_meeting_participant")]


class CallSessionStatus(models.TextChoices):
    ACTIVE = "active", "Active"
    ENDED = "ended", "Ended"


class CallSession(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    meeting = models.OneToOneField(Meeting, on_delete=models.CASCADE, related_name="call_session")
    status = models.CharField(max_length=20, choices=CallSessionStatus.choices, default=CallSessionStatus.ACTIVE)
    started_by = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.SET_NULL,
        null=True,
        related_name="started_call_sessions",
    )
    started_at = models.DateTimeField(auto_now_add=True)
    ended_at = models.DateTimeField(null=True, blank=True)

    class Meta:
        db_table = "training_call_session"


class CallParticipantStatus(models.TextChoices):
    JOINED = "joined", "Joined"
    LEFT = "left", "Left"


class CallParticipant(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    session = models.ForeignKey(CallSession, on_delete=models.CASCADE, related_name="call_participants")
    user = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.CASCADE,
        related_name="call_participations",
    )
    status = models.CharField(max_length=20, choices=CallParticipantStatus.choices, default=CallParticipantStatus.JOINED)
    is_muted = models.BooleanField(default=False)
    screen_share_active = models.BooleanField(default=False)
    joined_at = models.DateTimeField(auto_now_add=True)
    left_at = models.DateTimeField(null=True, blank=True)

    class Meta:
        db_table = "training_call_participant"


class CallEventType(models.TextChoices):
    JOIN = "join", "Join"
    LEAVE = "leave", "Leave"
    MUTE = "mute", "Mute"
    UNMUTE = "unmute", "Unmute"
    KICK = "kick", "Kick"
    SCREEN_SHARE_START = "screen_share_start", "Screen Share Start"
    SCREEN_SHARE_STOP = "screen_share_stop", "Screen Share Stop"
    SESSION_STARTED = "session_started", "Session Started"
    SESSION_ENDED = "session_ended", "Session Ended"


class CallEvent(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    session = models.ForeignKey(CallSession, on_delete=models.CASCADE, related_name="events")
    event_type = models.CharField(max_length=30, choices=CallEventType.choices)
    actor = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.SET_NULL,
        null=True,
        related_name="call_events_as_actor",
    )
    target_user = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name="call_events_as_target",
    )
    metadata = models.JSONField(default=dict, blank=True)
    occurred_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        db_table = "training_call_event"
        ordering = ["occurred_at"]


class EmployeeAttendance(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name="employee_attendance")
    attendance_date = models.DateField()
    status = models.CharField(max_length=20, choices=AttendanceStatus.choices)
    meeting = models.ForeignKey(Meeting, on_delete=models.SET_NULL, null=True, blank=True, related_name="employee_attendance_entries")
    source = models.CharField(max_length=64, default="meeting")
    updated_by = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True, blank=True, related_name="updated_employee_attendance")
    updated_at = models.DateTimeField(auto_now=True)
    created_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        db_table = "training_employee_attendance"
        constraints = [
            models.UniqueConstraint(
                fields=["user", "attendance_date", "meeting"],
                name="training_unique_employee_attendance_for_meeting",
            )
        ]