from __future__ import annotations

from dataclasses import dataclass, field, replace
from decimal import Decimal
from typing import Self

from domain.framework.entity import Entity
from domain.marketplace.classified_ad_id import ClassifiedAdId
from domain.marketplace.classified_ad_state import ClassifiedAdState
from domain.marketplace.classified_ad_text import ClassifiedAdText
from domain.marketplace.classified_ad_title import ClassifiedAdTitle
from domain.marketplace.domain_event import (
    ClassifiedAdCreated,
    ClassifiedAdPriceUpdated,
    ClassifiedAdSentForReview,
    ClassifiedAdTextUpdated,
    ClassifiedAdTitleChanged,
    DomainEvent,
)
from domain.marketplace.invalid_entity_state_exception import (
    InvalidEntityStateException,
)
from domain.marketplace.price import Price
from domain.marketplace.user_id import UserId


@dataclass(frozen=True)
class ClassifiedAd(Entity):
    id: ClassifiedAdId
    _ownerId: UserId
    title: ClassifiedAdTitle = field(default_factory=lambda: ClassifiedAdTitle(title=""))
    text: ClassifiedAdText = field(default_factory=lambda: ClassifiedAdText(text=""))
    price: Price = field(default_factory=lambda: Price(amount=Decimal("0.00")))
    state: ClassifiedAdState = ClassifiedAdState.Inactive
    _changes: tuple[DomainEvent, ...] = ()

    def __post_init__(self):
        if not self._changes:
            object.__setattr__(self, '_changes', (
                ClassifiedAdCreated(id=self.id.value, owner_id=self._ownerId.value),
            ))

    def _ensure_valid_state(self):
        errors = []
        if not self.title.title:
            errors.append("title")
        if not self.text.text:
            errors.append("text")
        if self.price.amount <= 0:
            errors.append("price")

        if errors:
            raise InvalidEntityStateException(
                f"Cannot publish classified ad with missing or invalid: {', '.join(errors)}"
            )

    def when(self, event: DomainEvent) -> Self:
        match event:
            case ClassifiedAdTitleChanged():
                return replace(self, title=ClassifiedAdTitle(title=event.title))
            case ClassifiedAdTextUpdated():
                return replace(self, text=ClassifiedAdText(text=event.ad_text))
            case ClassifiedAdPriceUpdated():
                return replace(self, price=Price(amount=event.price))
            case ClassifiedAdSentForReview():
                return replace(self, state=ClassifiedAdState.PendingReview)
        return self

    def request_to_publish(self):
        return self.apply(ClassifiedAdSentForReview(id=self.id.value))

    def set_title(self, title: ClassifiedAdTitle) -> ClassifiedAd:
        return self.apply(ClassifiedAdTitleChanged(id=self.id.value, title=title.title))

    def update_text(self, text: ClassifiedAdText) -> ClassifiedAd:
        return self.apply(ClassifiedAdTextUpdated(id=self.id.value, ad_text=text.text))

    def update_price(self, price: Price) -> ClassifiedAd:
        return self.apply(ClassifiedAdPriceUpdated(id=self.id.value, price=price.amount))