from fastapi import APIRouter, HTTPException, status, Query, Depends
from sqlalchemy.orm import Session
from typing import List
from datetime import date
import json
import logging
from sqlalchemy.exc import SQLAlchemyError

from app.models import (
    Shipment as ShipmentModel,
    Contact as ContactModel,
    Address as AddressModel,
    Proposal as ProposalModel,
    Dewar as DewarModel,
    LogisticsEvent,
    SampleEvent,
    PuckEvent,
)
from app.schemas import (
    ShipmentCreate,
    UpdateShipmentComments,
    Shipment as ShipmentSchema,
    Contact as ContactSchema,
    Sample as SampleSchema,
    loginData,
    Dewar,
)
from app.database import get_db
from app.crud import get_shipment_by_id, get_shipments
from app.routers.auth import get_current_user

shipment_router = APIRouter()


def default_serializer(obj):
    if isinstance(obj, date):
        return obj.isoformat()
    raise TypeError(f"Type {type(obj)} not serializable")


@shipment_router.get("", response_model=List[ShipmentSchema])
async def fetch_shipments(
    active_pgroup: str = Query(...),
    db: Session = Depends(get_db),
    current_user: loginData = Depends(get_current_user),
):
    # Validate that the active_pgroup belongs to the user
    if active_pgroup not in current_user.pgroups:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Invalid pgroup provided.",
        )

    # Query shipments matching the active_pgroup
    shipments = (
        db.query(ShipmentModel)
        .filter(ShipmentModel.pgroups.like(f"%{active_pgroup}%"))
        .all()
    )

    return shipments


@shipment_router.get("/shipments", response_model=List[ShipmentSchema])
async def get_all_shipments(db: Session = Depends(get_db)):
    try:
        shipments = get_shipments(db)
        return shipments
    except SQLAlchemyError as e:
        logging.error(f"Database error occurred: {e}")
        raise HTTPException(status_code=500, detail="Internal server error")


@shipment_router.get("/{shipment_id}/dewars", response_model=List[Dewar])
async def get_dewars_by_shipment_id(shipment_id: int, db: Session = Depends(get_db)):
    shipment = db.query(ShipmentModel).filter(ShipmentModel.id == shipment_id).first()
    if not shipment:
        raise HTTPException(status_code=404, detail="Shipment not found")

    dewars = db.query(DewarModel).filter(DewarModel.shipment_id == shipment_id).all()
    if not dewars:
        raise HTTPException(status_code=404, detail="No dewars found for this shipment")

    return dewars


@shipment_router.post(
    "", response_model=ShipmentSchema, status_code=status.HTTP_201_CREATED
)
async def create_shipment(shipment: ShipmentCreate, db: Session = Depends(get_db)):
    contact = (
        db.query(ContactModel).filter(ContactModel.id == shipment.contact_id).first()
    )
    return_address = (
        db.query(AddressModel)
        .filter(AddressModel.id == shipment.return_address_id)
        .first()
    )
    proposal = (
        db.query(ProposalModel).filter(ProposalModel.id == shipment.proposal_id).first()
    )

    if not (contact or return_address or proposal):
        raise HTTPException(status_code=404, detail="Associated entity not found")

    db_shipment = ShipmentModel(
        shipment_name=shipment.shipment_name,
        shipment_date=shipment.shipment_date,
        shipment_status=shipment.shipment_status,
        comments=shipment.comments,
        contact_id=contact.id,
        return_address_id=return_address.id,
        proposal_id=proposal.id,
        pgroups=shipment.pgroups,
    )

    # Handling dewars association
    if shipment.dewars:
        dewar_ids = [dewar.dewar_id for dewar in shipment.dewars]
        dewars = db.query(DewarModel).filter(DewarModel.id.in_(dewar_ids)).all()
        if len(dewars) != len(shipment.dewars):
            raise HTTPException(status_code=404, detail="One or more dewars not found")
        db_shipment.dewars.extend(dewars)

    db.add(db_shipment)
    db.commit()
    db.refresh(db_shipment)

    return db_shipment


@shipment_router.delete("/{shipment_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_shipment(shipment_id: int, db: Session = Depends(get_db)):
    # Fetch the shipment
    shipment = db.query(ShipmentModel).filter(ShipmentModel.id == shipment_id).first()
    if not shipment:
        raise HTTPException(status_code=404, detail="Shipment not found")

    # Check associated dewars
    dewars = db.query(DewarModel).filter(DewarModel.shipment_id == shipment_id).all()
    if dewars:
        # Ensure dewars, pucks, and samples have no associated events
        for dewar in dewars:
            if (
                db.query(LogisticsEvent)
                .filter(LogisticsEvent.dewar_id == dewar.id)
                .first()
            ):
                raise HTTPException(
                    status_code=400,
                    detail=f"Dewar {dewar.id} has associated logistics events."
                    f"Shipment cannot be deleted.",
                )

            for puck in dewar.pucks:
                if db.query(PuckEvent).filter(PuckEvent.puck_id == puck.id).first():
                    raise HTTPException(
                        status_code=400,
                        detail=f"Puck {puck.id}"
                        f" in Dewar {dewar.id}"
                        f" has associated puck events."
                        f"Shipment cannot be deleted.",
                    )

                for sample in puck.samples:
                    if (
                        db.query(SampleEvent)
                        .filter(SampleEvent.sample_id == sample.id)
                        .first()
                    ):
                        raise HTTPException(
                            status_code=400,
                            detail=f"Sample {sample.id}"
                            f" in Puck {puck.id}"
                            f" has associated sample events."
                            f"Shipment cannot be deleted.",
                        )

    # If no events are found, proceed to delete the shipment
    for dewar in dewars:
        for puck in dewar.pucks:
            for sample in puck.samples:
                db.delete(sample)  # Delete associated samples
            db.delete(puck)  # Delete associated pucks
        db.delete(dewar)  # Delete the dewar itself

    # Finally, delete the shipment
    db.delete(shipment)
    db.commit()
    return


@shipment_router.put("/{shipment_id}", response_model=ShipmentSchema)
async def update_shipment(
    shipment_id: int, updated_shipment: ShipmentCreate, db: Session = Depends(get_db)
):
    print(
        "Received payload:",
        json.dumps(updated_shipment.dict(), indent=2, default=default_serializer),
    )

    shipment = db.query(ShipmentModel).filter(ShipmentModel.id == shipment_id).first()
    if not shipment:
        raise HTTPException(status_code=404, detail="Shipment not found")

    # Validate relationships by IDs
    contact_person = (
        db.query(ContactModel)
        .filter(ContactModel.id == updated_shipment.contact_person_id)
        .first()
    )
    return_address = (
        db.query(AddressModel)
        .filter(AddressModel.id == updated_shipment.return_address_id)
        .first()
    )
    if not contact_person:
        raise HTTPException(status_code=404, detail="Contact person not found")
    if not return_address:
        raise HTTPException(status_code=404, detail="Return address not found")

    # Update shipment details
    shipment.shipment_name = updated_shipment.shipment_name
    shipment.shipment_date = updated_shipment.shipment_date
    shipment.shipment_status = updated_shipment.shipment_status
    shipment.comments = updated_shipment.comments
    shipment.contact_person_id = updated_shipment.contact_person_id
    shipment.return_address_id = updated_shipment.return_address_id

    # Process and update dewars' details
    for dewar_data in updated_shipment.dewars:
        dewar = (
            db.query(DewarModel).filter(DewarModel.id == dewar_data.dewar_id).first()
        )
        if not dewar:
            raise HTTPException(
                status_code=404, detail=f"Dewar with ID {dewar_data.dewar_id} not found"
            )

        update_fields = dewar_data.dict(exclude_unset=True)
        for key, value in update_fields.items():
            if key == "contact_person_id":
                contact_person = (
                    db.query(ContactModel).filter(ContactModel.id == value).first()
                )
                if not contact_person:
                    raise HTTPException(
                        status_code=404,
                        detail=f"Contact person with ID {value}"
                        f"for Dewar {dewar_data.dewar_id} not found",
                    )
            if key == "return_address_id":
                address = (
                    db.query(AddressModel).filter(AddressModel.id == value).first()
                )
                if not address:
                    raise HTTPException(
                        status_code=404,
                        detail=f"Address with ID {value}"
                        f"for Dewar {dewar_data.dewar_id} not found",
                    )

        for key, value in update_fields.items():
            if key != "dewar_id":
                setattr(dewar, key, value)

    db.commit()
    db.refresh(shipment)
    return shipment


@shipment_router.post("/{shipment_id}/add_dewar", response_model=ShipmentSchema)
async def add_dewar_to_shipment(
    shipment_id: int, dewar_id: int, db: Session = Depends(get_db)
):
    shipment = db.query(ShipmentModel).filter(ShipmentModel.id == shipment_id).first()
    if not shipment:
        raise HTTPException(status_code=404, detail="Shipment not found")
    dewar = db.query(DewarModel).filter(DewarModel.id == dewar_id).first()
    if not dewar:
        raise HTTPException(status_code=404, detail="Dewar not found")

    if dewar not in shipment.dewars:
        shipment.dewars.append(dewar)
        db.commit()
        db.refresh(shipment)
    return shipment


@shipment_router.delete(
    "/{shipment_id}/remove_dewar/{dewar_id}", response_model=ShipmentSchema
)
async def remove_dewar_from_shipment(
    shipment_id: int, dewar_id: int, db: Session = Depends(get_db)
):
    # Fetch the shipment
    shipment = db.query(ShipmentModel).filter(ShipmentModel.id == shipment_id).first()
    if not shipment:
        raise HTTPException(status_code=404, detail="Shipment not found")

    # Check if the dewar belongs to the shipment
    dewar = (
        db.query(DewarModel)
        .filter(DewarModel.id == dewar_id, DewarModel.shipment_id == shipment_id)
        .first()
    )
    if not dewar:
        raise HTTPException(
            status_code=404,
            detail=f"Dewar with ID {dewar_id} not found in shipment {shipment_id}",
        )

    # Check for logistics events associated with the dewar
    logistics_event_exists = (
        db.query(LogisticsEvent).filter(LogisticsEvent.dewar_id == dewar_id).first()
    )
    if logistics_event_exists:
        raise HTTPException(
            status_code=400,
            detail=f"Dewar {dewar_id} has " f" logistics events. Removal not allowed.",
        )

    # Check associated pucks and their events
    for puck in dewar.pucks:
        puck_event_exists = (
            db.query(PuckEvent).filter(PuckEvent.puck_id == puck.id).first()
        )
        if puck_event_exists:
            raise HTTPException(
                status_code=400,
                detail=f"Puck {puck.id} in Dewar {dewar_id}"
                f" has associated events. Removal not allowed.",
            )

        # Check associated samples and their events
        for sample in puck.samples:
            sample_event_exists = (
                db.query(SampleEvent).filter(SampleEvent.sample_id == sample.id).first()
            )
            if sample_event_exists:
                raise HTTPException(
                    status_code=400,
                    detail=f"Sample {sample.id} "
                    f"in Puck {puck.id} "
                    f"has associated events. Removal not allowed.",
                )

    # Perform cascade deletion: Delete samples, pucks, and the dewar
    for puck in dewar.pucks:
        for sample in puck.samples:
            db.delete(sample)  # Delete associated samples
        db.delete(puck)  # Delete associated puck
    db.delete(dewar)  # Finally, delete the dewar itself

    db.commit()
    db.refresh(shipment)

    return shipment


@shipment_router.get("/contact_persons", response_model=List[ContactSchema])
async def get_shipment_contact_persons(db: Session = Depends(get_db)):
    contact_persons = db.query(ContactModel).all()
    return contact_persons


@shipment_router.get("/{shipment_id}/samples", response_model=List[SampleSchema])
async def get_samples_in_shipment(shipment_id: int, db: Session = Depends(get_db)):
    shipment = db.query(ShipmentModel).filter(ShipmentModel.id == shipment_id).first()
    if shipment is None:
        raise HTTPException(status_code=404, detail="Shipment not found")

    samples = []
    for dewar in shipment.dewars:
        for puck in dewar.pucks:
            samples.extend(puck.samples)

    return samples


@shipment_router.get(
    "/shipments/{shipment_id}/dewars/{dewar_id}/samples",
    response_model=List[SampleSchema],
)
async def get_samples_in_dewar(
    shipment_id: int, dewar_id: int, db: Session = Depends(get_db)
):
    shipment = get_shipment_by_id(db, shipment_id)
    if not shipment:
        raise HTTPException(status_code=404, detail="Shipment not found")

    dewar = next((d for d in shipment.dewars if d.id == dewar_id), None)
    if not dewar:
        raise HTTPException(status_code=404, detail="Dewar not found")

    samples = []
    for puck in dewar.pucks:
        for sample in puck.samples:
            samples.append(sample)

    return samples


@shipment_router.put("/{shipment_id}/comments", response_model=ShipmentSchema)
async def update_shipment_comments(
    shipment_id: int,
    comments_data: UpdateShipmentComments,
    db: Session = Depends(get_db),
):
    shipment = db.query(ShipmentModel).filter(ShipmentModel.id == shipment_id).first()
    if not shipment:
        raise HTTPException(status_code=404, detail="Shipment not found")

    shipment.comments = comments_data.comments
    db.commit()
    db.refresh(shipment)
    return shipment