"""
FastAPI application for medical report generation.

This API provides a single endpoint that accepts all required files
and patient information, then generates a comprehensive medical report.
"""

import shutil
import tempfile
from pathlib import Path

from fastapi import FastAPI, File, Form, HTTPException, UploadFile
from fastapi.responses import FileResponse
from pydantic import BaseModel

from services.report_generator import ReportGeneratorService

app = FastAPI(
    title="Medical Report Generation API",
    description="API for generating medical performance reports with analysis and graphs",
    version="2.0.0",
)

# Define output directories
GRAPHS_DIR = Path("graphs")
GRAPHS_DIR.mkdir(exist_ok=True)

REPORTS_DIR = Path("reports")
REPORTS_DIR.mkdir(exist_ok=True)

# Initialize report generator service
report_service = ReportGeneratorService(
    template_dir="app/report_gen",
    graphs_dir=str(GRAPHS_DIR),
    reports_dir=str(REPORTS_DIR),
)


class ReportResponse(BaseModel):
    message: str
    report_path: str
    graphs_generated: list
    analysis_data: dict


@app.get("/")
async def root():
    """Root endpoint with API information"""
    return {
        "message": "Medical Report Generation API",
        "version": "2.0.0",
        "endpoints": {
            "generate_report": "POST /generate-report",
            "download_report": "GET /download-report/{filename}",
            "health": "GET /health",
        },
    }


@app.get("/health")
async def health_check():
    """Health check endpoint"""
    return {"status": "healthy", "service": "report-generation-api"}


@app.post("/generate-report", response_model=ReportResponse)
async def generate_report(
    patient_name: str = Form(..., description="Patient name"),
    age: int = Form(..., description="Patient age"),
    height: str = Form(..., description="Patient height (e.g., 5'4\")"),
    weight: str = Form(..., description="Patient weight (e.g., 123lbs)"),
    focus: str = Form(default="Endurance", description="Training focus"),
    session_id: str = Form(default="default", description="Session ID"),
    spirometry_pdf: UploadFile = File(..., description="Spirometry PDF file"),
    pnoe_csv: UploadFile = File(..., description="Pnoe CSV file"),
    seca_excel: UploadFile = File(..., description="SECA Excel file"),
):
    """
    Generate a comprehensive medical report from uploaded files.

    This endpoint accepts all required files and patient information,
    processes the data, generates graphs, and returns a PDF report.

    Args:
        spirometry_pdf: Spirometry PDF file
        pnoe_csv: Pnoe CSV data file
        seca_excel: SECA body composition Excel file
        patient_name: Name of the patient
        age: Patient age
        height: Patient height
        weight: Patient weight
        focus: Training focus (default: Endurance)
        session_id: Session identifier (default: default)

    Returns:
        ReportResponse with report path, graphs generated, and analysis data
    """
    # Validate file types
    if not spirometry_pdf.filename.endswith(".pdf"):
        raise HTTPException(status_code=400, detail="Spirometry file must be a PDF")

    if not pnoe_csv.filename.endswith(".csv"):
        raise HTTPException(status_code=400, detail="Pnoe file must be a CSV")

    if not seca_excel.filename.endswith((".xlsx", ".xls")):
        raise HTTPException(
            status_code=400, detail="SECA file must be an Excel file (.xlsx or .xls)"
        )

    # Create temporary directory for uploaded files
    with tempfile.TemporaryDirectory() as temp_dir:
        temp_path = Path(temp_dir)

        # Save uploaded files temporarily
        spirometry_path = temp_path / f"spirometry_{spirometry_pdf.filename}"
        pnoe_path = temp_path / f"pnoe_{pnoe_csv.filename}"
        seca_path = temp_path / f"seca_{seca_excel.filename}"

        try:
            # Write files
            with open(spirometry_path, "wb") as f:
                shutil.copyfileobj(spirometry_pdf.file, f)

            with open(pnoe_path, "wb") as f:
                shutil.copyfileobj(pnoe_csv.file, f)

            with open(seca_path, "wb") as f:
                shutil.copyfileobj(seca_excel.file, f)

            # Prepare patient information
            patient_info = {
                "patient_name": patient_name,
                "age": age,
                "height": height,
                "weight": weight,
                "focus": focus,
                "session_id": session_id,
            }

            # Generate report using the service
            result = report_service.generate_report(
                spirometry_pdf_path=str(spirometry_path),
                pnoe_csv_path=str(pnoe_path),
                seca_excel_path=str(seca_path),
                patient_info=patient_info,
            )

            return ReportResponse(
                message="Report generated successfully",
                report_path=result["report_path"],
                graphs_generated=result["graphs_generated"],
                analysis_data=result["analysis_data"],
            )

        except Exception as e:
            raise HTTPException(
                status_code=500,
                detail=f"Error generating report: {str(e)}",
            )
        finally:
            # Close file handles
            spirometry_pdf.file.close()
            pnoe_csv.file.close()
            seca_excel.file.close()


@app.get("/download-report/{filename}")
async def download_report(filename: str):
    """
    Download a generated report.

    Args:
        filename: Name of the report file

    Returns:
        PDF file
    """
    file_path = REPORTS_DIR / filename

    if not file_path.exists():
        raise HTTPException(status_code=404, detail="Report not found")

    return FileResponse(
        path=file_path,
        media_type="application/pdf",
        filename=filename,
    )


if __name__ == "__main__":
    import uvicorn

    uvicorn.run(app, host="0.0.0.0", port=8000)