"""Notification target management API routes."""

import logging

from fastapi import APIRouter, Depends, HTTPException, Query, status
from pydantic import BaseModel
from sqlmodel import select
from sqlmodel.ext.asyncio.session import AsyncSession
from typing import Any

from ..auth.dependencies import get_current_user
from ..database.engine import get_session
from ..database.models import NotificationTarget, NotificationTrackerTarget, TelegramBot, TelegramChat, User
from ..services.notifier import send_test_notification

_LOGGER = logging.getLogger(__name__)

router = APIRouter(prefix="/api/targets", tags=["targets"])


class TargetCreate(BaseModel):
    type: str  # "telegram" or "webhook"
    name: str
    icon: str = ""
    config: dict[str, Any] = {}
    chat_action: str | None = None


class TargetUpdate(BaseModel):
    name: str | None = None
    icon: str | None = None
    config: dict[str, Any] | None = None
    chat_action: str | None = None


@router.get("")
async def list_targets(
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """List all notification targets for the current user."""
    result = await session.exec(
        select(NotificationTarget).where(NotificationTarget.user_id == user.id)
    )
    targets = result.all()

    # Resolve chat names for telegram targets
    chat_names: dict[str, str] = {}
    for tgt in targets:
        if tgt.type == "telegram" and tgt.config.get("chat_id"):
            bot_id = tgt.config.get("bot_id")
            chat_id = str(tgt.config["chat_id"])
            if bot_id:
                chat_result = await session.exec(
                    select(TelegramChat).where(
                        TelegramChat.bot_id == bot_id,
                        TelegramChat.chat_id == chat_id,
                    )
                )
                chat = chat_result.first()
                if chat:
                    chat_names[f"{bot_id}_{chat_id}"] = chat.title or chat.username or ""

    return [_target_response(t, chat_names) for t in targets]


@router.post("", status_code=status.HTTP_201_CREATED)
async def create_target(
    body: TargetCreate,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Create a new notification target."""
    if body.type not in ("telegram", "webhook"):
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Type must be 'telegram' or 'webhook'",
        )
    target = NotificationTarget(
        user_id=user.id,
        type=body.type,
        name=body.name,
        icon=body.icon,
        config=body.config,
        chat_action=body.chat_action,
    )
    session.add(target)
    await session.commit()
    await session.refresh(target)
    return {"id": target.id, "type": target.type, "name": target.name}


@router.get("/{target_id}")
async def get_target(
    target_id: int,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Get a specific notification target."""
    target = await _get_user_target(session, target_id, user.id)
    return _target_response(target)


@router.put("/{target_id}")
async def update_target(
    target_id: int,
    body: TargetUpdate,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Update a notification target."""
    target = await _get_user_target(session, target_id, user.id)
    for field, value in body.model_dump(exclude_unset=True).items():
        setattr(target, field, value)
    session.add(target)
    await session.commit()
    await session.refresh(target)
    return {"id": target.id, "type": target.type, "name": target.name}


@router.delete("/{target_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_target(
    target_id: int,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Delete a notification target and its tracker links."""
    target = await _get_user_target(session, target_id, user.id)
    # Delete associated tracker-target links
    result = await session.exec(
        select(NotificationTrackerTarget).where(NotificationTrackerTarget.target_id == target_id)
    )
    for tt in result.all():
        await session.delete(tt)
    await session.delete(target)
    await session.commit()


@router.post("/{target_id}/test")
async def test_target(
    target_id: int,
    locale: str = Query("en"),
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Send a test notification to a target."""
    target = await _get_user_target(session, target_id, user.id)
    result = await send_test_notification(target, locale=locale)
    return result


def _target_response(target: NotificationTarget, chat_names: dict[str, str] | None = None) -> dict:
    resp = {
        "id": target.id,
        "type": target.type,
        "name": target.name,
        "icon": target.icon,
        "config": _safe_config(target),
        "chat_action": target.chat_action,
        "created_at": target.created_at.isoformat(),
    }
    # Attach resolved chat name for telegram targets
    if target.type == "telegram" and chat_names:
        bot_id = target.config.get("bot_id")
        chat_id = str(target.config.get("chat_id", ""))
        key = f"{bot_id}_{chat_id}"
        if key in chat_names:
            resp["chat_name"] = chat_names[key]
    return resp


def _safe_config(target: NotificationTarget) -> dict:
    """Return config with sensitive fields masked."""
    config = dict(target.config)
    if "bot_token" in config:
        token = config["bot_token"]
        config["bot_token"] = f"{token[:8]}...{token[-4:]}" if len(token) > 12 else "***"
    if "api_key" in config:
        config["api_key"] = "***"
    return config


async def _get_user_target(
    session: AsyncSession, target_id: int, user_id: int
) -> NotificationTarget:
    target = await session.get(NotificationTarget, target_id)
    if not target or target.user_id != user_id:
        raise HTTPException(status_code=404, detail="Target not found")
    return target