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

from contacts.models import Channel, Contact
from core.models import TimeStampedModel, UUIDPrimaryKeyModel


class MessageTemplate(UUIDPrimaryKeyModel, TimeStampedModel):
    name = models.CharField(max_length=120)
    channel = models.CharField(max_length=16, choices=Channel.choices)
    subject = models.CharField(max_length=255, blank=True)
    body = models.TextField()
    postcard_front = models.JSONField(default=dict, blank=True)
    postcard_back = models.JSONField(default=dict, blank=True)

    def __str__(self) -> str:
        return f"{self.name} ({self.channel})"


class Campaign(UUIDPrimaryKeyModel, TimeStampedModel):
    class Status(models.TextChoices):
        DRAFT = "draft", "Draft"
        SCHEDULED = "scheduled", "Scheduled"
        SENDING = "sending", "Sending"
        COMPLETED = "completed", "Completed"
        CANCELLED = "cancelled", "Cancelled"

    class Audience(models.TextChoices):
        EMAIL_OPT_IN = "email_opt_in", "Mailing list · email opt-in"
        SMS_OPT_IN = "sms_opt_in", "Mailing list · SMS opt-in"
        POSTCARD_OPT_IN = "postcard_opt_in", "Mailing list · postcard opt-in"

    name = models.CharField(max_length=120)
    channel = models.CharField(max_length=16, choices=Channel.choices)
    audience = models.CharField(
        max_length=32,
        choices=Audience.choices,
        blank=True,
        default="",
    )
    template = models.ForeignKey(
        MessageTemplate,
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="campaigns",
    )
    status = models.CharField(
        max_length=16, choices=Status.choices, default=Status.DRAFT
    )
    scheduled_for = models.DateTimeField(null=True, blank=True)
    created_by = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
    )
    subject_override = models.CharField(max_length=255, blank=True)
    body_override = models.TextField(blank=True)
    # Set when realtor summary email is sent (campaign COMPLETED).
    notify_sent_at = models.DateTimeField(null=True, blank=True)

    class Meta:
        ordering = ["-created_at"]

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


class Message(UUIDPrimaryKeyModel, TimeStampedModel):
    class Status(models.TextChoices):
        DRAFT = "draft", "Draft"
        SCHEDULED = "scheduled", "Scheduled"
        QUEUED = "queued", "Queued"
        SENT = "sent", "Sent"
        DELIVERED = "delivered", "Delivered"
        OPENED = "opened", "Opened"
        CLICKED = "clicked", "Clicked"
        FAILED = "failed", "Failed"
        BOUNCED = "bounced", "Bounced"
        SUPPRESSED = "suppressed", "Suppressed"

    campaign = models.ForeignKey(
        Campaign, on_delete=models.CASCADE, related_name="messages"
    )
    contact = models.ForeignKey(
        Contact, on_delete=models.CASCADE, related_name="messages"
    )
    channel = models.CharField(max_length=16, choices=Channel.choices)
    status = models.CharField(
        max_length=16, choices=Status.choices, default=Status.DRAFT
    )
    provider = models.CharField(max_length=64, blank=True)
    provider_message_id = models.CharField(max_length=255, blank=True)
    scheduled_for = models.DateTimeField(null=True, blank=True)
    sent_at = models.DateTimeField(null=True, blank=True)
    error = models.TextField(blank=True)
    body_snapshot = models.TextField(blank=True)

    class Meta:
        ordering = ["-created_at"]

    def __str__(self) -> str:
        return f"{self.channel} → {self.contact} ({self.status})"


class ProviderEvent(TimeStampedModel):
    message = models.ForeignKey(
        Message,
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="events",
    )
    provider = models.CharField(max_length=64)
    event_type = models.CharField(max_length=64)
    payload = models.JSONField(default=dict, blank=True)


class StoredFile(UUIDPrimaryKeyModel, TimeStampedModel):
    """Binary file blob in the database (no filesystem media storage)."""

    class Kind(models.TextChoices):
        CAMPAIGN_IMAGE = "campaign_image", "Campaign image"
        SOCIAL_IMAGE = "social_image", "Social image"
        SOCIAL_VIDEO = "social_video", "Social video"

    kind = models.CharField(
        max_length=32, choices=Kind.choices, default=Kind.CAMPAIGN_IMAGE
    )
    filename = models.CharField(max_length=255, blank=True)
    content_type = models.CharField(max_length=128)
    size = models.PositiveIntegerField(default=0)
    data = models.BinaryField()
    uploaded_by = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="uploaded_files",
    )

    class Meta:
        ordering = ["-created_at"]

    def __str__(self) -> str:
        return self.filename or str(self.pk)