"""Pydantic request/response schemas for the JSON API."""
from __future__ import annotations

from typing import Optional

from pydantic import BaseModel, field_validator


class FeedIn(BaseModel):
    url: str
    title: str = ""
    ntfy_server: str = ""
    ntfy_topic: str = ""
    ntfy_token: str = ""
    ntfy_username: str = ""
    ntfy_password: str = ""
    priority: int = 3
    tags: str = ""
    attach_image: bool = True
    to_telegram: bool = False
    to_webhook: bool = False
    filter_include: str = ""
    filter_exclude: str = ""
    interval: int = 0
    enabled: bool = True

    @field_validator("url")
    @classmethod
    def _url_required(cls, v: str) -> str:
        v = v.strip()
        if not v:
            raise ValueError("URL ленты обязателен")
        if not v.startswith(("http://", "https://")):
            raise ValueError("URL должен начинаться с http:// или https://")
        return v

    @field_validator("priority")
    @classmethod
    def _priority_range(cls, v: int) -> int:
        return min(5, max(1, v))

    @field_validator("interval")
    @classmethod
    def _interval_nonneg(cls, v: int) -> int:
        return max(0, v)


class SettingsIn(BaseModel):
    default_ntfy_server: str = "https://ntfy.sh"
    default_ntfy_token: str = ""
    default_ntfy_username: str = ""
    default_ntfy_password: str = ""
    check_interval: int = 5
    auth_enabled: bool = False
    # Telegram
    telegram_enabled: bool = False
    telegram_token: str = ""
    telegram_chat_id: str = ""
    # Webhook
    webhook_enabled: bool = False
    webhook_url: str = ""
    # Admin alerts
    alerts_enabled: bool = False
    alert_topic: str = ""
    alert_threshold: int = 3

    @field_validator("check_interval")
    @classmethod
    def _interval_min(cls, v: int) -> int:
        return max(1, v)

    @field_validator("alert_threshold")
    @classmethod
    def _threshold_min(cls, v: int) -> int:
        return max(1, v)


class TestIn(BaseModel):
    server: str = ""
    topic: str
    # Optional auth from the form; falls back to saved default-server creds.
    token: str | None = None
    username: str | None = None
    password: str | None = None


class PreviewIn(BaseModel):
    url: str
    filter_include: str = ""
    filter_exclude: str = ""

    @field_validator("url")
    @classmethod
    def _url_required(cls, v: str) -> str:
        v = v.strip()
        if not v.startswith(("http://", "https://")):
            raise ValueError("URL должен начинаться с http:// или https://")
        return v


class UserIn(BaseModel):
    username: str
    password: str = ""  # empty on edit = keep existing
    role: str = "admin"

    @field_validator("username")
    @classmethod
    def _username_required(cls, v: str) -> str:
        v = v.strip()
        if not v:
            raise ValueError("Логин обязателен")
        return v

    @field_validator("role")
    @classmethod
    def _role_valid(cls, v: str) -> str:
        return v if v in ("admin", "viewer") else "viewer"