import uuid
from datetime import datetime
from decimal import Decimal
from typing import Literal

from pydantic import Field, HttpUrl, model_validator

from app.schemas import StrictModel


class TodoItem(StrictModel):
    number: int
    text: str = Field(min_length=1, max_length=1024)


class CompanyDocumentInput(StrictModel):
    object_key: str = Field(min_length=1, max_length=1024)
    title: str = Field(min_length=1, max_length=255)
    mime_type: str = Field(min_length=1, max_length=128)
    size_bytes: int = Field(gt=0)
    checksum_sha256: str = Field(pattern=r"^[0-9a-f]{64}$")


class NotificationDetailsInput(StrictModel):
    deadline: datetime | None = None
    details_header: str | None = Field(default=None, max_length=255)
    details_text: str | None = Field(default=None, max_length=4000)
    todo_header: str | None = Field(default=None, max_length=255)
    todo_plan: list[TodoItem] | None = Field(default=None, min_length=1)
    send_documents: bool = False
    documents: list[CompanyDocumentInput] | None = Field(default=None, min_length=1)


class NotificationCreateRequest(StrictModel):
    user_id: uuid.UUID
    notification_type: str = Field(min_length=1, max_length=32)
    source: str = Field(min_length=1, max_length=32)
    external_id: str = Field(min_length=1, max_length=128)
    notification_datetime: datetime
    header: str = Field(min_length=1, max_length=255)
    text: str | None = Field(default=None, max_length=1024)
    priority_override: int | None = None
    date_expired: datetime | None = None
    price: Decimal | None = Field(default=None, ge=0, max_digits=12, decimal_places=2)
    old_price: Decimal | None = Field(default=None, ge=0, max_digits=12, decimal_places=2)
    payment_url: HttpUrl | None = None
    chat_message_text: str | None = Field(default=None, max_length=1024)
    details: NotificationDetailsInput | None = None

    @model_validator(mode="after")
    def prices(self) -> "NotificationCreateRequest":
        if self.old_price is not None and self.price is None:
            raise ValueError("old_price requires price")
        return self


class NotificationCancelRequest(StrictModel):
    source: str = Field(min_length=1, max_length=32)
    external_id: str = Field(min_length=1, max_length=128)
    close_reason: Literal["cancelled", "paid"]


class UploadInitRequest(StrictModel):
    context_type: Literal["notification"]
    context_id: uuid.UUID
    file_name: str = Field(min_length=1, max_length=255)
    mime_type: str = Field(min_length=1, max_length=128)
    size_bytes: int = Field(gt=0)


class UploadCompleteRequest(StrictModel):
    checksum: str = Field(pattern=r"^sha256:[0-9a-f]{64}$")