from fastapi import APIRouter, HTTPException, Depends, UploadFile, File
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,
)
from app.models import (
    Puck as PuckModel,
    Sample as SampleModel,
    SampleEvent as SampleEventModel,
)
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(db: Session = Depends(get_db)):
    logging.info("Fetching all pucks with samples and events")

    pucks = (
        db.query(PuckModel)
        .options(
            joinedload(PuckModel.samples).joinedload(
                SampleModel.events
            ),  # Correct nested relationship
            joinedload(PuckModel.events),  # If Puck has its own events relationship
        )
        .all()
    )

    if not pucks:
        raise HTTPException(status_code=404, detail="No pucks found in the database")

    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("/samples/{sample_id}/upload-images")
async def upload_sample_images(
    sample_id: int,
    uploaded_files: list[UploadFile] = File(...),
    db: Session = Depends(get_db),
):
    logging.info(f"Received files: {[file.filename for file in uploaded_files]}")

    """
    Uploads images for a given sample and saves them to a directory structure.
    Args:
        sample_id (int): ID of the sample.
        uploaded_files (list[UploadFile]): A list of files uploaded with the request.
        db (Session): Database session.
    """

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

    # 2. Define Directory Structure
    username = "e16371"  # Hardcoded username; replace with dynamic logic if applicable
    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/{username}/{today}/{dewar_name}/{puck_name}/{position}")
    base_dir.mkdir(parents=True, exist_ok=True)

    # 3. Process and Save Each File
    saved_files = []
    for file in uploaded_files:
        # Validate MIME type
        if not file.content_type.startswith("image/"):
            raise HTTPException(
                status_code=400,
                detail=f"Invalid file type: {file.filename}. Only images are accepted.",
            )

        # Save file to the base directory
        file_path = base_dir / file.filename

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

    # 4. Return Saved Files Information
    logging.info(f"Uploaded {len(saved_files)} files for sample {sample_id}.")
    return {
        "message": f"{len(saved_files)} images uploaded successfully.",
        "files": saved_files,
    }