first commit

app/api/ocr.py

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+import re
+from decimal import Decimal
+
+from fastapi import APIRouter, File, UploadFile
+from pydantic import BaseModel
+
+router = APIRouter(prefix="/ocr", tags=["ocr"])
+
+
+class ReceiptSuggestion(BaseModel):
+    total_cost: Decimal | None = None
+    liters: Decimal | None = None
+    price_per_liter: Decimal | None = None
+    station: str | None = None
+    confidence: float
+    message: str
+
+
+@router.post("/fuel-receipt", response_model=ReceiptSuggestion)
+async def scan_fuel_receipt(file: UploadFile = File(...)) -> ReceiptSuggestion:
+    content = await file.read()
+    text = content.decode("utf-8", errors="ignore")
+    numbers = [Decimal(item.replace(",", ".")) for item in re.findall(r"\d+[,.]\d+|\d+", text)]
+    total = max(numbers) if numbers else None
+    liters = next((item for item in numbers if Decimal("5") <= item <= Decimal("120")), None)
+    price = None
+    if total and liters and liters:
+        price = (total / liters).quantize(Decimal("0.01"))
+
+    return ReceiptSuggestion(
+        total_cost=total,
+        liters=liters,
+        price_per_liter=price,
+        station=None,
+        confidence=0.35 if numbers else 0,
+        message=(
+            "OCR-модуль готов к подключению движка распознавания. Сейчас извлекаю числа из текстового слоя/имени файла."
+            if numbers
+            else "Не удалось распознать чек. Можно заполнить поля вручную, а OCR-движок подключить отдельным сервисом."
+        ),
+    )