from fastapi import APIRouter, HTTPException, Depends, UploadFile, File, Form
from sqlalchemy.orm import Session
from pathlib import Path
from typing import List
from datetime import datetime
import shutil
from app.schemas import (
    Puck as PuckSchema,
    Sample as SampleSchema,
    SampleEventCreate,
    Sample,
    Image,
    ImageCreate,
    SampleResult,
    ExperimentParametersCreate,
    ExperimentParametersRead,
)
from app.models import (
    Puck as PuckModel,
    Sample as SampleModel,
    SampleEvent as SampleEventModel,
    Image as ImageModel,
    Dewar as DewarModel,
    ExperimentParameters as ExperimentParametersModel,
)
from app.dependencies import get_db
import logging
from sqlalchemy.orm import joinedload

router = APIRouter()


@router.get("/{puck_id}/samples", response_model=List[SampleSchema])
async def get_samples_with_events(puck_id: int, db: Session = Depends(get_db)):
    puck = db.query(PuckModel).filter(PuckModel.id == puck_id).first()
    if not puck:
        raise HTTPException(status_code=404, detail="Puck not found")

    samples = db.query(SampleModel).filter(SampleModel.puck_id == puck_id).all()

    for sample in samples:
        sample.events = (
            db.query(SampleEventModel)
            .filter(SampleEventModel.sample_id == sample.id)
            .all()
        )

    return samples


@router.get("/pucks-samples", response_model=List[PuckSchema])
async def get_all_pucks_with_samples_and_events(
    active_pgroup: str, db: Session = Depends(get_db)
):
    logging.info(
        "Fetching all pucks with " "samples and events for active_pgroup: %s",
        active_pgroup,
    )

    pucks = (
        db.query(PuckModel)
        .join(PuckModel.samples)  # Join samples related to the puck
        .join(PuckModel.dewar)  # Join the dewar from the puck
        .join(SampleModel.events)  # Join sample events
        .filter(DewarModel.pgroups == active_pgroup)  # Filter by the dewar's group
        .options(
            joinedload(PuckModel.samples).joinedload(SampleModel.events),
            joinedload(PuckModel.dewar),
        )
        .distinct()  # Avoid duplicate puck rows if there are multiple events/samples
        .all()
    )

    if not pucks:
        raise HTTPException(
            status_code=404,
            detail="No pucks found with" " sample events for the active pgroup",
        )

    # Extract samples from each puck if needed
    filtered_samples = []
    for puck in pucks:
        if puck.dewar and getattr(puck.dewar, "pgroups", None) == active_pgroup:
            for sample in puck.samples:
                filtered_samples.append(sample)

    # Depending on what your endpoint expects,
    # you may choose to return pucks or samples.
    # For now, we're returning the list of pucks.
    return pucks


# Route to post a new sample event
@router.post("/samples/{sample_id}/events", response_model=Sample)
async def create_sample_event(
    sample_id: int, event: SampleEventCreate, db: Session = Depends(get_db)
):
    # Ensure the sample exists
    sample = db.query(SampleModel).filter(SampleModel.id == sample_id).first()
    if not sample:
        raise HTTPException(status_code=404, detail="Sample not found")

    # Create the event
    sample_event = SampleEventModel(
        sample_id=sample_id,
        event_type=event.event_type,
        timestamp=datetime.now(),  # Use the current timestamp
    )
    db.add(sample_event)
    db.commit()
    db.refresh(sample_event)

    # Load events for the sample to be serialized in the response
    sample.events = (
        db.query(SampleEventModel).filter(SampleEventModel.sample_id == sample_id).all()
    )

    return sample  # Return the sample, now including `mount_count`


@router.post("/{sample_id}/upload-images", response_model=Image)
async def upload_sample_image(
    sample_id: int,
    uploaded_file: UploadFile = File(...),
    comment: str = Form(None),
    db: Session = Depends(get_db),
):
    logging.info(f"Received file: {uploaded_file.filename}")

    # Validate Sample
    sample = db.query(SampleModel).filter(SampleModel.id == sample_id).first()
    if not sample:
        raise HTTPException(status_code=404, detail="Sample not found")

    # Define Directory Structure
    pgroup = sample.puck.dewar.pgroups  # adjust to sample or puck pgroups as needed
    today = datetime.now().strftime("%Y-%m-%d")
    dewar_name = (
        sample.puck.dewar.dewar_name
        if sample.puck and sample.puck.dewar
        else "default_dewar"
    )
    puck_name = sample.puck.puck_name if sample.puck else "default_puck"
    position = sample.position if sample.position else "default_position"
    base_dir = Path(f"images/{pgroup}/{today}/{dewar_name}/{puck_name}/{position}")
    base_dir.mkdir(parents=True, exist_ok=True)

    # Validate MIME type and Save the File
    if not uploaded_file.content_type.startswith("image/"):
        raise HTTPException(
            status_code=400,
            detail=f"Invalid file type: {uploaded_file.filename}."
            f" Only images are accepted.",
        )

    file_path = base_dir / uploaded_file.filename
    logging.debug(f"Saving file {uploaded_file.filename} to {file_path}")

    try:
        with file_path.open("wb") as buffer:
            shutil.copyfileobj(uploaded_file.file, buffer)
        logging.info(f"File saved: {file_path}")
    except Exception as e:
        logging.error(f"Error saving file {uploaded_file.filename}: {str(e)}")
        raise HTTPException(
            status_code=500,
            detail=f"Could not save file {uploaded_file.filename}."
            f" Ensure the server has correct permissions.",
        )

    # Create the payload from the Pydantic schema
    image_payload = ImageCreate(
        pgroup=pgroup,
        comment=comment,
        filepath=str(file_path),
        status="active",
        sample_id=sample_id,
    ).dict()

    # Convert the payload to your mapped SQLAlchemy model instance.
    # Make sure that ImageModel is your mapped model for images.
    new_image = ImageModel(**image_payload)
    db.add(new_image)
    db.commit()
    db.refresh(new_image)

    logging.info(
        f"Uploaded 1 file for sample {sample_id} and"
        f" added record {new_image.id} to the database."
    )
    # Returning the mapped SQLAlchemy object, which will be converted to the
    # Pydantic response model.
    return new_image


@router.get("/results", response_model=List[SampleResult])
async def get_sample_results(active_pgroup: str, db: Session = Depends(get_db)):
    # Query samples for the active pgroup using joins.
    samples = (
        db.query(SampleModel)
        .join(SampleModel.puck)
        .join(PuckModel.dewar)
        .filter(DewarModel.pgroups == active_pgroup)
        .all()
    )
    if not samples:
        raise HTTPException(
            status_code=404, detail="No samples found for the active pgroup"
        )

    results = []
    for sample in samples:
        # Query images associated with the sample.
        images = db.query(ImageModel).filter(ImageModel.sample_id == sample.id).all()

        # Query experiment parameters (which include beamline parameters) for the
        # sample.
        experiment_parameters = (
            db.query(ExperimentParametersModel)
            .filter(ExperimentParametersModel.sample_id == sample.id)
            .all()
        )
        print("Experiment Parameters for sample", sample.id, experiment_parameters)

        results.append(
            {
                "sample_id": sample.id,
                "sample_name": sample.sample_name,
                "puck_name": sample.puck.puck_name if sample.puck else None,
                "dewar_name": sample.puck.dewar.dewar_name
                if (sample.puck and sample.puck.dewar)
                else None,
                "images": [
                    {"id": img.id, "filepath": img.filepath, "comment": img.comment}
                    for img in images
                ],
                "experiment_runs": [
                    {
                        "id": ex.id,
                        "run_number": ex.run_number,
                        "beamline_parameters": ex.beamline_parameters,
                        "sample_id": ex.sample_id,
                    }
                    for ex in experiment_parameters
                ],
            }
        )

    return results


@router.post(
    "/samples/{sample_id}/experiment_parameters",
    response_model=ExperimentParametersRead,
)
def create_experiment_parameters_for_sample(
    sample_id: int,
    exp_params: ExperimentParametersCreate,
    db: Session = Depends(get_db),
):
    # Calculate the new run_number for the given sample.
    # This assumes that the run_number is computed as one plus the maximum
    # current value.
    last_exp = (
        db.query(ExperimentParametersModel)
        .filter(ExperimentParametersModel.sample_id == sample_id)
        .order_by(ExperimentParametersModel.run_number.desc())
        .first()
    )
    new_run_number = last_exp.run_number + 1 if last_exp else 1

    # Create a new ExperimentParameters record. The beamline_parameters are
    # stored as JSON.
    new_exp = ExperimentParametersModel(
        run_number=new_run_number,
        beamline_parameters=exp_params.beamline_parameters.dict()
        if exp_params.beamline_parameters
        else None,
        sample_id=sample_id,
    )
    db.add(new_exp)
    db.commit()
    db.refresh(new_exp)

    return new_exp