roa2web-service-auto/data-entry-app/backend/app/routers/ocr.py

"""OCR API endpoints."""

import os
import tempfile
from pathlib import Path

from fastapi import APIRouter, HTTPException, UploadFile, File, Depends
from sqlalchemy.ext.asyncio import AsyncSession

from app.db.database import get_session
from app.db.crud.attachment import AttachmentCRUD
from app.services.ocr_service import ocr_service
from app.services.ocr_engine import OCREngine
from app.schemas.ocr import OCRResponse, OCRStatusResponse, ExtractionData, TvaEntry

router = APIRouter()


@router.get("/status", response_model=OCRStatusResponse)
async def get_ocr_status():
    """Check OCR service status and available engines."""
    engines = OCREngine.get_available_engines()
    available = len(engines) > 0

    if available:
        message = f"OCR service ready with engines: {', '.join(engines)}"
    else:
        message = "No OCR engines available. Install PaddleOCR or Tesseract."

    return OCRStatusResponse(
        available=available,
        engines=engines,
        message=message
    )


@router.post("/extract", response_model=OCRResponse)
async def extract_from_image(file: UploadFile = File(...)):
    """
    Extract receipt data from uploaded image.

    Accepts JPG, PNG, or PDF files (max 10MB).
    Returns extracted fields with confidence scores.
    """
    allowed_types = ['image/jpeg', 'image/png', 'application/pdf']

    if file.content_type not in allowed_types:
        raise HTTPException(
            status_code=400,
            detail=f"File type not supported: {file.content_type}. Allowed: JPG, PNG, PDF"
        )

    # Get file extension
    suffix = Path(file.filename).suffix.lower() if file.filename else '.jpg'
    if suffix not in ['.jpg', '.jpeg', '.png', '.pdf']:
        suffix = '.jpg'

    # Save to temp file
    with tempfile.NamedTemporaryFile(delete=False, suffix=suffix) as tmp:
        content = await file.read()

        # Check file size (10MB limit)
        if len(content) > 10 * 1024 * 1024:
            raise HTTPException(
                status_code=400,
                detail="File too large. Maximum size is 10MB."
            )

        tmp.write(content)
        tmp_path = Path(tmp.name)

    try:
        success, message, result = await ocr_service.process_image(
            tmp_path, file.content_type
        )

        if not success:
            raise HTTPException(status_code=422, detail=message)

        # Convert ExtractionResult to ExtractionData schema
        # Convert tva_entries from dict to TvaEntry objects
        tva_entries_schema = [
            TvaEntry(code=e.get('code'), percent=e['percent'], amount=e['amount'])
            for e in result.tva_entries
        ] if result.tva_entries else []

        data = ExtractionData(
            receipt_type=result.receipt_type,
            receipt_number=result.receipt_number,
            receipt_series=result.receipt_series,
            receipt_date=result.receipt_date,
            amount=result.amount,
            partner_name=result.partner_name,
            cui=result.cui,
            description=result.description,
            tva_entries=tva_entries_schema,
            tva_total=result.tva_total,
            address=result.address,
            items_count=result.items_count,
            confidence_amount=result.confidence_amount,
            confidence_date=result.confidence_date,
            confidence_vendor=result.confidence_vendor,
            overall_confidence=result.overall_confidence,
            raw_text=result.raw_text,
            ocr_engine=result.ocr_engine,
            processing_time_ms=result.processing_time_ms,
        )

        return OCRResponse(success=True, message=message, data=data)

    finally:
        # Clean up temp file
        if tmp_path.exists():
            os.unlink(tmp_path)


@router.post("/extract-attachment/{attachment_id}", response_model=OCRResponse)
async def extract_from_attachment(
    attachment_id: int,
    session: AsyncSession = Depends(get_session),
):
    """
    Extract receipt data from an existing attachment.

    Re-processes an already uploaded file with OCR.
    """
    attachment = await AttachmentCRUD.get_by_id(session, attachment_id)

    if not attachment:
        raise HTTPException(status_code=404, detail="Attachment not found")

    file_path = AttachmentCRUD.get_file_path(attachment)

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

    # Check if file type is supported
    if attachment.mime_type not in ['image/jpeg', 'image/png', 'application/pdf']:
        raise HTTPException(
            status_code=400,
            detail=f"File type not supported for OCR: {attachment.mime_type}"
        )

    success, message, result = await ocr_service.process_image(
        file_path, attachment.mime_type
    )

    if not success:
        raise HTTPException(status_code=422, detail=message)

    # Convert ExtractionResult to ExtractionData schema
    # Convert tva_entries from dict to TvaEntry objects
    tva_entries_schema = [
        TvaEntry(code=e.get('code'), percent=e['percent'], amount=e['amount'])
        for e in result.tva_entries
    ] if result.tva_entries else []

    data = ExtractionData(
        receipt_type=result.receipt_type,
        receipt_number=result.receipt_number,
        receipt_series=result.receipt_series,
        receipt_date=result.receipt_date,
        amount=result.amount,
        partner_name=result.partner_name,
        cui=result.cui,
        description=result.description,
        tva_entries=tva_entries_schema,
        tva_total=result.tva_total,
        address=result.address,
        items_count=result.items_count,
        confidence_amount=result.confidence_amount,
        confidence_date=result.confidence_date,
        confidence_vendor=result.confidence_vendor,
        overall_confidence=result.overall_confidence,
        raw_text=result.raw_text,
        ocr_engine=result.ocr_engine,
        processing_time_ms=result.processing_time_ms,
    )

    return OCRResponse(success=True, message=message, data=data)