from datetime import datetime, timezone
from enum import Enum
from typing import TYPE_CHECKING, Optional

from sqlalchemy import Column
from sqlalchemy import Enum as SAEnum
from sqlmodel import Field, Relationship, SQLModel

from app.models.mail_template import MailEventType

if TYPE_CHECKING:
    from app.models.participant import Participant
    from app.models.purchase_round import PurchaseRound


class MailLogStatus(str, Enum):
    SENT = "sent"
    FAILED = "failed"
    DELIVERED = "delivered"  # udfyldes først af webhook i opgave 7c
    BOUNCED = "bounced"  # udfyldes først af webhook i opgave 7c


class MailLog(SQLModel, table=True):
    __tablename__ = "mail_log"

    id: Optional[int] = Field(default=None, primary_key=True)
    participant_id: int = Field(foreign_key="participant.id", ondelete="CASCADE")
    purchase_round_id: int = Field(foreign_key="purchase_round.id", ondelete="CASCADE")
    mail_template_id: Optional[int] = Field(default=None, foreign_key="mail_template.id", ondelete="SET NULL")

    event_type: MailEventType = Field(
        sa_column=Column(
            SAEnum(
                MailEventType,
                name="mail_event_type",
                native_enum=False,
                values_callable=lambda enum_cls: [member.value for member in enum_cls],
            ),
            nullable=False,
        )
    )
    rendered_subject: str
    status: MailLogStatus = Field(
        sa_column=Column(
            SAEnum(
                MailLogStatus,
                name="mail_log_status",
                native_enum=False,
                values_callable=lambda enum_cls: [member.value for member in enum_cls],
            ),
            nullable=False,
        )
    )
    postal_message_id: Optional[int] = Field(default=None)
    postal_token: Optional[str] = Field(default=None)
    error_message: Optional[str] = Field(default=None)
    sent_at: Optional[datetime] = Field(default=None)
    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))

    participant: "Participant" = Relationship(back_populates="mail_logs")
    purchase_round: "PurchaseRound" = Relationship(back_populates="mail_logs")


class MailLogPublic(SQLModel):
    id: int
    participant_id: int
    purchase_round_id: int
    event_type: MailEventType
    rendered_subject: str
    status: MailLogStatus
    error_message: Optional[str]
    sent_at: Optional[datetime]
    created_at: datetime