from typing import Annotated

from fastapi import APIRouter, Depends, HTTPException
from sqlmodel import select

from ..config import settings
from ..deps import SessionDep, get_current_username
from ..models.models import (Image, Place, Trip, TripCreate, TripDay,
                             TripDayBase, TripDayRead, TripItem,
                             TripItemCreate, TripItemRead, TripItemUpdate,
                             TripPackingListItem, TripPackingListItemCreate,
                             TripPackingListItemRead,
                             TripPackingListItemUpdate, TripPlaceLink,
                             TripRead, TripReadBase, TripShare, TripShareURL,
                             TripUpdate)
from ..security import verify_exists_and_owns
from ..utils.utils import (b64img_decode, generate_urlsafe, remove_image,
                           save_image_to_file)

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


@router.get("", response_model=list[TripReadBase])
def read_trips(
    session: SessionDep, current_user: Annotated[str, Depends(get_current_username)]
) -> list[TripReadBase]:
    trips = session.exec(select(Trip).filter(Trip.user == current_user))
    return [TripReadBase.serialize(trip) for trip in trips]


@router.get("/{trip_id}", response_model=TripRead)
def read_trip(
    session: SessionDep, trip_id: int, current_user: Annotated[str, Depends(get_current_username)]
) -> TripRead:
    db_trip = session.get(Trip, trip_id)
    verify_exists_and_owns(current_user, db_trip)
    return TripRead.serialize(db_trip)


@router.post("", response_model=TripReadBase)
def create_trip(
    trip: TripCreate, session: SessionDep, current_user: Annotated[str, Depends(get_current_username)]
) -> TripReadBase:
    new_trip = Trip(
        name=trip.name,
        user=current_user,
    )

    if trip.image:
        image_bytes = b64img_decode(trip.image)
        filename = save_image_to_file(image_bytes, settings.TRIP_IMAGE_SIZE)
        if not filename:
            raise HTTPException(status_code=400, detail="Bad request")

        image = Image(filename=filename, user=current_user)
        session.add(image)
        session.commit()
        session.refresh(image)
        new_trip.image_id = image.id

    if trip.place_ids:
        for place_id in trip.place_ids:
            db_place = session.get(Place, place_id)
            verify_exists_and_owns(current_user, db_place)
            session.add(TripPlaceLink(trip_id=new_trip.id, place_id=db_place.id))
        session.commit()

    session.add(new_trip)
    session.commit()
    session.refresh(new_trip)
    return TripReadBase.serialize(new_trip)


@router.put("/{trip_id}", response_model=TripRead)
def update_trip(
    session: SessionDep,
    trip_id: int,
    trip: TripUpdate,
    current_user: Annotated[str, Depends(get_current_username)],
) -> TripRead:
    db_trip = session.get(Trip, trip_id)
    verify_exists_and_owns(current_user, db_trip)

    if db_trip.archived and (trip.archived is not False):
        raise HTTPException(status_code=400, detail="Bad request")

    trip_data = trip.model_dump(exclude_unset=True)

    image_b64 = trip_data.pop("image", None)
    if image_b64:
        try:
            image_bytes = b64img_decode(image_b64)
        except Exception:
            raise HTTPException(status_code=400, detail="Bad request")

        filename = save_image_to_file(image_bytes, settings.TRIP_IMAGE_SIZE)
        if not filename:
            raise HTTPException(status_code=400, detail="Bad request")

        image = Image(filename=filename, user=current_user)
        session.add(image)
        session.commit()
        session.refresh(image)

        if db_trip.image_id:
            old_image = session.get(Image, db_trip.image_id)
            try:
                remove_image(old_image.filename)
                session.delete(old_image)
                db_trip.image_id = None
                session.refresh(db_trip)
            except Exception:
                raise HTTPException(status_code=400, detail="Bad request")

        db_trip.image_id = image.id

    place_ids = trip_data.pop("place_ids", None)
    if place_ids is not None:  # Could be empty [], so 'in'
        db_trip.places.clear()
        for place_id in place_ids:
            db_place = session.get(Place, place_id)
            verify_exists_and_owns(current_user, db_place)
            db_trip.places.append(db_place)

        item_place_ids = {
            item.place.id for day in db_trip.days for item in day.items if item.place is not None
        }
        invalid_place_ids = item_place_ids - set(place.id for place in db_trip.places)
        if invalid_place_ids:  # TripItem references a Place that Trip.places misses
            raise HTTPException(status_code=400, detail="Bad Request")

    for key, value in trip_data.items():
        setattr(db_trip, key, value)

    session.add(db_trip)
    session.commit()
    session.refresh(db_trip)
    return TripRead.serialize(db_trip)


@router.delete("/{trip_id}")
def delete_trip(
    session: SessionDep, trip_id: int, current_user: Annotated[str, Depends(get_current_username)]
):
    db_trip = session.get(Trip, trip_id)
    verify_exists_and_owns(current_user, db_trip)

    if db_trip.archived:
        raise HTTPException(status_code=400, detail="Bad request")

    if db_trip.image:
        try:
            remove_image(db_trip.image.filename)
            session.delete(db_trip.image)
        except Exception:
            raise HTTPException(
                status_code=500,
                detail="Roses are red, violets are blue, if you're reading this, I'm sorry for you",
            )

    session.delete(db_trip)
    session.commit()
    return {}


@router.post("/{trip_id}/days", response_model=TripDayRead)
def create_tripday(
    td: TripDayBase,
    trip_id: int,
    session: SessionDep,
    current_user: Annotated[str, Depends(get_current_username)],
) -> TripDayRead:
    db_trip = session.get(Trip, trip_id)
    verify_exists_and_owns(current_user, db_trip)

    if db_trip.archived:
        raise HTTPException(status_code=400, detail="Bad request")

    new_day = TripDay(label=td.label, trip_id=trip_id, user=current_user)

    session.add(new_day)
    session.commit()
    session.refresh(new_day)
    return TripDayRead.serialize(new_day)


@router.put("/{trip_id}/days/{day_id}", response_model=TripDayRead)
def update_tripday(
    td: TripDayBase,
    trip_id: int,
    day_id: int,
    session: SessionDep,
    current_user: Annotated[str, Depends(get_current_username)],
) -> TripDayRead:
    db_trip = session.get(Trip, trip_id)
    verify_exists_and_owns(current_user, db_trip)

    if db_trip.archived:
        raise HTTPException(status_code=400, detail="Bad request")

    db_day = session.get(TripDay, day_id)
    verify_exists_and_owns(current_user, db_day)
    if db_day.trip_id != trip_id:
        raise HTTPException(status_code=400, detail="Bad request")

    td_data = td.model_dump(exclude_unset=True)
    for key, value in td_data.items():
        setattr(db_day, key, value)

    session.add(db_day)
    session.commit()
    session.refresh(db_day)
    return TripDayRead.serialize(db_day)


@router.delete("/{trip_id}/days/{day_id}")
def delete_tripday(
    session: SessionDep,
    trip_id: int,
    day_id: int,
    current_user: Annotated[str, Depends(get_current_username)],
):
    db_trip = session.get(Trip, trip_id)
    verify_exists_and_owns(current_user, db_trip)

    if db_trip.archived:
        raise HTTPException(status_code=400, detail="Bad request")

    db_day = session.get(TripDay, day_id)
    verify_exists_and_owns(current_user, db_day)
    if db_day.trip_id != trip_id:
        raise HTTPException(status_code=400, detail="Bad request")

    session.delete(db_day)
    session.commit()
    return {}


@router.post("/{trip_id}/days/{day_id}/items", response_model=TripItemRead)
def create_tripitem(
    item: TripItemCreate,
    trip_id: int,
    day_id: int,
    session: SessionDep,
    current_user: Annotated[str, Depends(get_current_username)],
) -> TripItemRead:
    db_trip = session.get(Trip, trip_id)
    verify_exists_and_owns(current_user, db_trip)

    if db_trip.archived:
        raise HTTPException(status_code=400, detail="Bad request")

    db_day = session.get(TripDay, day_id)
    if db_day.trip_id != trip_id:
        raise HTTPException(status_code=400, detail="Bad request")

    new_item = TripItem(
        time=item.time,
        text=item.text,
        comment=item.comment,
        lat=item.lat,
        lng=item.lng,
        day_id=day_id,
        price=item.price,
        status=item.status,
    )

    if item.place and item.place != "":
        place_in_trip = any(place.id == item.place for place in db_trip.places)
        if not place_in_trip:
            raise HTTPException(status_code=400, detail="Bad request")
        new_item.place_id = item.place

    session.add(new_item)
    session.commit()
    session.refresh(new_item)
    return TripItemRead.serialize(new_item)


@router.put("/{trip_id}/days/{day_id}/items/{item_id}", response_model=TripItemRead)
def update_tripitem(
    item: TripItemUpdate,
    trip_id: int,
    day_id: int,
    item_id: int,
    session: SessionDep,
    current_user: Annotated[str, Depends(get_current_username)],
) -> TripItemRead:
    db_trip = session.get(Trip, trip_id)
    verify_exists_and_owns(current_user, db_trip)

    if db_trip.archived:
        raise HTTPException(status_code=400, detail="Bad request")

    db_day = session.get(TripDay, day_id)
    if db_day.trip_id != trip_id:
        raise HTTPException(status_code=400, detail="Bad request")

    db_item = session.get(TripItem, item_id)
    if db_item.day_id != day_id:
        raise HTTPException(status_code=400, detail="Bad request")

    item_data = item.model_dump(exclude_unset=True)

    place_id = item_data.pop("place", None)
    db_item.place_id = place_id
    if place_id is not None:
        place_in_trip = any(p.id == place_id for p in db_trip.places)
        if not place_in_trip:
            raise HTTPException(status_code=400, detail="Bad request")

    for key, value in item_data.items():
        setattr(db_item, key, value)

    session.add(db_item)
    session.commit()
    session.refresh(db_item)
    return TripItemRead.serialize(db_item)


@router.delete("/{trip_id}/days/{day_id}/items/{item_id}")
def delete_tripitem(
    session: SessionDep,
    trip_id: int,
    day_id: int,
    item_id: int,
    current_user: Annotated[str, Depends(get_current_username)],
):
    db_trip = session.get(Trip, trip_id)
    verify_exists_and_owns(current_user, db_trip)

    if db_trip.archived:
        raise HTTPException(status_code=400, detail="Bad request")

    db_day = session.get(TripDay, day_id)
    if db_day.trip_id != trip_id:
        raise HTTPException(status_code=400, detail="Bad request")

    db_item = session.get(TripItem, item_id)
    if db_item.day_id != day_id:
        raise HTTPException(status_code=400, detail="Bad request")

    session.delete(db_item)
    session.commit()
    return {}


@router.get("/shared/{token}", response_model=TripRead)
def read_shared_trip(
    session: SessionDep,
    token: str,
) -> TripRead:
    share = session.exec(select(TripShare).where(TripShare.token == token)).first()
    if not share:
        raise HTTPException(status_code=404, detail="Not found")

    db_trip = session.get(Trip, share.trip_id)
    return TripRead.serialize(db_trip)


@router.get("/{trip_id}/share", response_model=TripShareURL)
def get_shared_trip_url(
    session: SessionDep,
    trip_id: int,
    current_user: Annotated[str, Depends(get_current_username)],
) -> TripShareURL:
    db_trip = session.get(Trip, trip_id)
    verify_exists_and_owns(current_user, db_trip)

    share = session.exec(select(TripShare).where(TripShare.trip_id == trip_id)).first()
    if not share:
        raise HTTPException(status_code=404, detail="Not found")

    return {"url": f"/s/t/{share.token}"}


@router.post("/{trip_id}/share", response_model=TripShareURL)
def create_shared_trip(
    session: SessionDep,
    trip_id: int,
    current_user: Annotated[str, Depends(get_current_username)],
) -> TripShareURL:
    db_trip = session.get(Trip, trip_id)
    verify_exists_and_owns(current_user, db_trip)

    shared = session.exec(select(TripShare).where(TripShare.trip_id == trip_id)).first()
    if shared:
        raise HTTPException(status_code=409, detail="The resource already exists")

    token = generate_urlsafe()
    trip_share = TripShare(token=token, trip_id=trip_id, user=current_user)
    session.add(trip_share)
    session.commit()
    return {"url": f"/s/t/{token}"}


@router.delete("/{trip_id}/share")
def delete_shared_trip(
    session: SessionDep,
    trip_id: int,
    current_user: Annotated[str, Depends(get_current_username)],
):
    db_trip = session.get(Trip, trip_id)
    verify_exists_and_owns(current_user, db_trip)

    db_share = session.exec(select(TripShare).where(TripShare.trip_id == trip_id)).first()
    if not db_share:
        raise HTTPException(status_code=404, detail="Not found")

    session.delete(db_share)
    session.commit()
    return {}


@router.get("/{trip_id}/packing", response_model=list[TripPackingListItemRead])
def read_packing_list(
    session: SessionDep,
    trip_id: int,
    current_user: Annotated[str, Depends(get_current_username)],
) -> list[TripPackingListItemRead]:
    p_items = session.exec(
        select(TripPackingListItem)
        .where(TripPackingListItem.trip_id == trip_id, TripPackingListItem.user == current_user)
        .order_by(TripPackingListItem.id.asc())
    ).all()

    return [TripPackingListItemRead.serialize(i) for i in p_items]


@router.post("/{trip_id}/packing", response_model=TripPackingListItemRead)
def create_packing_item(
    session: SessionDep,
    trip_id: int,
    data: TripPackingListItemCreate,
    current_user: Annotated[str, Depends(get_current_username)],
) -> TripPackingListItemRead:
    item = TripPackingListItem(
        **data.model_dump(),
        trip_id=trip_id,
        user=current_user,
    )
    session.add(item)
    session.commit()
    session.refresh(item)
    return TripPackingListItemRead.serialize(item)


@router.put("/{trip_id}/packing/{p_id}", response_model=TripPackingListItemRead)
def update_packing_item(
    session: SessionDep,
    p_item: TripPackingListItemUpdate,
    trip_id: int,
    p_id: int,
    current_user: Annotated[str, Depends(get_current_username)],
) -> TripPackingListItemRead:
    db_item = session.exec(
        select(TripPackingListItem).where(
            TripPackingListItem.id == p_id,
            TripPackingListItem.trip_id == trip_id,
            TripPackingListItem.user == current_user,
        )
    ).one_or_none()

    if not db_item:
        raise HTTPException(status_code=404, detail="Not found")

    item_data = p_item.model_dump(exclude_unset=True)
    for key, value in item_data.items():
        setattr(db_item, key, value)

    session.add(db_item)
    session.commit()
    session.refresh(db_item)
    return TripPackingListItemRead.serialize(db_item)


@router.delete("/{trip_id}/packing/{p_id}")
def delete_packing_item(
    session: SessionDep,
    trip_id: int,
    p_id: int,
    current_user: Annotated[str, Depends(get_current_username)],
):
    item = session.exec(
        select(TripPackingListItem).where(
            TripPackingListItem.id == p_id,
            TripPackingListItem.trip_id == trip_id,
            TripPackingListItem.user == current_user,
        )
    ).one_or_none()

    if not item:
        raise HTTPException(status_code=404, detail="Not found")

    session.delete(item)
    session.commit()
    return {}