"""Immich server management API routes."""

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

import aiohttp

from immich_watcher_core.immich_client import ImmichClient

from ..auth.dependencies import get_current_user
from ..database.engine import get_session
from ..database.models import ImmichServer, User

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


class ServerCreate(BaseModel):
    name: str = "Immich"
    url: str
    api_key: str


class ServerUpdate(BaseModel):
    name: str | None = None
    url: str | None = None
    api_key: str | None = None


class ServerResponse(BaseModel):
    id: int
    name: str
    url: str
    created_at: str


@router.get("")
async def list_servers(
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """List all Immich servers for the current user."""
    result = await session.exec(
        select(ImmichServer).where(ImmichServer.user_id == user.id)
    )
    servers = result.all()
    return [
        {"id": s.id, "name": s.name, "url": s.url, "created_at": s.created_at.isoformat()}
        for s in servers
    ]


@router.post("", status_code=status.HTTP_201_CREATED)
async def create_server(
    body: ServerCreate,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Add a new Immich server (validates connection)."""
    # Validate connection
    async with aiohttp.ClientSession() as http_session:
        client = ImmichClient(http_session, body.url, body.api_key)
        if not await client.ping():
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail=f"Cannot connect to Immich server at {body.url}",
            )
        # Fetch external domain
        external_domain = await client.get_server_config()

    server = ImmichServer(
        user_id=user.id,
        name=body.name,
        url=body.url,
        api_key=body.api_key,
        external_domain=external_domain,
    )
    session.add(server)
    await session.commit()
    await session.refresh(server)
    return {"id": server.id, "name": server.name, "url": server.url}


@router.get("/{server_id}")
async def get_server(
    server_id: int,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Get a specific Immich server."""
    server = await _get_user_server(session, server_id, user.id)
    return {"id": server.id, "name": server.name, "url": server.url, "created_at": server.created_at.isoformat()}


@router.put("/{server_id}")
async def update_server(
    server_id: int,
    body: ServerUpdate,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Update an Immich server."""
    server = await _get_user_server(session, server_id, user.id)
    if body.name is not None:
        server.name = body.name
    url_changed = body.url is not None and body.url != server.url
    key_changed = body.api_key is not None and body.api_key != server.api_key
    if body.url is not None:
        server.url = body.url
    if body.api_key is not None:
        server.api_key = body.api_key
    # Re-validate and refresh external_domain when URL or API key changes
    if url_changed or key_changed:
        try:
            async with aiohttp.ClientSession() as http_session:
                client = ImmichClient(http_session, server.url, server.api_key)
                if not await client.ping():
                    raise HTTPException(
                        status_code=status.HTTP_400_BAD_REQUEST,
                        detail=f"Cannot connect to Immich server at {server.url}",
                    )
                server.external_domain = await client.get_server_config()
        except aiohttp.ClientError as err:
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail=f"Connection error: {err}",
            )
    session.add(server)
    await session.commit()
    await session.refresh(server)
    return {"id": server.id, "name": server.name, "url": server.url}


@router.delete("/{server_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_server(
    server_id: int,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Delete an Immich server."""
    server = await _get_user_server(session, server_id, user.id)
    await session.delete(server)
    await session.commit()


@router.get("/{server_id}/ping")
async def ping_server(
    server_id: int,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Check if an Immich server is reachable."""
    server = await _get_user_server(session, server_id, user.id)
    async with aiohttp.ClientSession() as http_session:
        client = ImmichClient(http_session, server.url, server.api_key)
        ok = await client.ping()
        return {"online": ok}


@router.get("/{server_id}/albums")
async def list_albums(
    server_id: int,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Fetch albums from an Immich server."""
    server = await _get_user_server(session, server_id, user.id)
    async with aiohttp.ClientSession() as http_session:
        client = ImmichClient(http_session, server.url, server.api_key)
        albums = await client.get_albums()
    return [
        {
            "id": a.get("id"),
            "albumName": a.get("albumName"),
            "assetCount": a.get("assetCount", 0),
            "shared": a.get("shared", False),
            "updatedAt": a.get("updatedAt", ""),
        }
        for a in albums
    ]


async def _get_user_server(
    session: AsyncSession, server_id: int, user_id: int
) -> ImmichServer:
    """Get a server owned by the user, or raise 404."""
    server = await session.get(ImmichServer, server_id)
    if not server or server.user_id != user_id:
        raise HTTPException(status_code=404, detail="Server not found")
    return server