315 lines
11 KiB
Python
315 lines
11 KiB
Python
from fastapi import FastAPI, Depends, HTTPException, APIRouter
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from fastapi.middleware.cors import CORSMiddleware
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from sqlalchemy.orm import Session
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from typing import List, Optional
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from datetime import datetime
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from .database import engine, get_db, Base
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from .models import Drug, DrugVariant, Dispensing
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from pydantic import BaseModel
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# Create tables
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Base.metadata.create_all(bind=engine)
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app = FastAPI(title="Drug Inventory API")
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# CORS middleware for frontend
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app.add_middleware(
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CORSMiddleware,
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allow_origins=["*"], # In production, restrict this
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allow_credentials=True,
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allow_methods=["*"],
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allow_headers=["*"],
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)
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# Create a router with /api prefix
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router = APIRouter(prefix="/api")
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# Pydantic schemas
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class DrugCreate(BaseModel):
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name: str
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description: str = None
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class DrugUpdate(BaseModel):
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name: str = None
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description: str = None
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class DrugResponse(BaseModel):
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id: int
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name: str
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description: str = None
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class Config:
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from_attributes = True
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class DrugVariantCreate(BaseModel):
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strength: str
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quantity: float
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unit: str = "units"
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low_stock_threshold: float = 10
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class DrugVariantUpdate(BaseModel):
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strength: str = None
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quantity: float = None
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unit: str = None
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low_stock_threshold: float = None
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class DrugVariantResponse(BaseModel):
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id: int
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drug_id: int
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strength: str
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quantity: float
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unit: str
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low_stock_threshold: float
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class Config:
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from_attributes = True
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class DrugWithVariantsResponse(BaseModel):
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id: int
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name: str
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description: str = None
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variants: List[DrugVariantResponse] = []
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class Config:
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from_attributes = True
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class DispensingCreate(BaseModel):
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drug_variant_id: int
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quantity: float
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animal_name: Optional[str] = None
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user_name: str
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notes: Optional[str] = None
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class DispensingResponse(BaseModel):
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id: int
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drug_variant_id: int
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quantity: float
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animal_name: Optional[str] = None
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user_name: str
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notes: Optional[str] = None
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dispensed_at: datetime
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class Config:
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from_attributes = True
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# Routes
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@router.get("/")
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def read_root():
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return {"message": "Drug Inventory API"}
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@router.get("/drugs", response_model=List[DrugWithVariantsResponse])
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def list_drugs(db: Session = Depends(get_db)):
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"""Get all drugs with their variants"""
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drugs = db.query(Drug).all()
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result = []
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for drug in drugs:
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variants = db.query(DrugVariant).filter(DrugVariant.drug_id == drug.id).all()
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drug_dict = drug.__dict__.copy()
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drug_dict['variants'] = variants
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result.append(drug_dict)
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return result
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@router.get("/drugs/low-stock", response_model=List[DrugWithVariantsResponse])
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def low_stock_drugs(db: Session = Depends(get_db)):
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"""Get drugs with low stock variants"""
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# Get variants that are low on stock
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low_stock_variants = db.query(DrugVariant).filter(
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DrugVariant.quantity <= DrugVariant.low_stock_threshold
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).all()
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# Get unique drug IDs
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drug_ids = list(set(v.drug_id for v in low_stock_variants))
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drugs = db.query(Drug).filter(Drug.id.in_(drug_ids)).all()
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result = []
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for drug in drugs:
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variants = [v for v in low_stock_variants if v.drug_id == drug.id]
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drug_dict = drug.__dict__.copy()
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drug_dict['variants'] = variants
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result.append(drug_dict)
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return result
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@router.get("/drugs/{drug_id}", response_model=DrugWithVariantsResponse)
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def get_drug(drug_id: int, db: Session = Depends(get_db)):
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"""Get a specific drug with its variants"""
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drug = db.query(Drug).filter(Drug.id == drug_id).first()
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if not drug:
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raise HTTPException(status_code=404, detail="Drug not found")
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variants = db.query(DrugVariant).filter(DrugVariant.drug_id == drug.id).all()
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drug_dict = drug.__dict__.copy()
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drug_dict['variants'] = variants
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return drug_dict
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@router.post("/drugs", response_model=DrugWithVariantsResponse)
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def create_drug(drug: DrugCreate, db: Session = Depends(get_db)):
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"""Create a new drug"""
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# Check if drug name already exists
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existing = db.query(Drug).filter(Drug.name == drug.name).first()
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if existing:
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raise HTTPException(status_code=400, detail="Drug with this name already exists")
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db_drug = Drug(name=drug.name, description=drug.description)
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db.add(db_drug)
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db.commit()
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db.refresh(db_drug)
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# Return drug with empty variants list
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drug_dict = db_drug.__dict__.copy()
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drug_dict['variants'] = []
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return drug_dict
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@router.put("/drugs/{drug_id}", response_model=DrugWithVariantsResponse)
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def update_drug(drug_id: int, drug_update: DrugUpdate, db: Session = Depends(get_db)):
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"""Update a drug"""
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drug = db.query(Drug).filter(Drug.id == drug_id).first()
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if not drug:
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raise HTTPException(status_code=404, detail="Drug not found")
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for field, value in drug_update.dict(exclude_unset=True).items():
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setattr(drug, field, value)
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db.commit()
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db.refresh(drug)
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variants = db.query(DrugVariant).filter(DrugVariant.drug_id == drug.id).all()
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drug_dict = drug.__dict__.copy()
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drug_dict['variants'] = variants
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return drug_dict
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@router.delete("/drugs/{drug_id}")
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def delete_drug(drug_id: int, db: Session = Depends(get_db)):
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"""Delete a drug and all its variants"""
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drug = db.query(Drug).filter(Drug.id == drug_id).first()
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if not drug:
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raise HTTPException(status_code=404, detail="Drug not found")
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# Delete all variants first
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db.query(DrugVariant).filter(DrugVariant.drug_id == drug_id).delete()
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# Delete the drug
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db.delete(drug)
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db.commit()
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return {"message": "Drug and all variants deleted successfully"}
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# Drug Variant endpoints
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@router.post("/drugs/{drug_id}/variants", response_model=DrugVariantResponse)
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def create_drug_variant(drug_id: int, variant: DrugVariantCreate, db: Session = Depends(get_db)):
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"""Create a new variant for a drug"""
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# Check if drug exists
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drug = db.query(Drug).filter(Drug.id == drug_id).first()
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if not drug:
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raise HTTPException(status_code=404, detail="Drug not found")
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# Check if variant with same strength already exists for this drug
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existing = db.query(DrugVariant).filter(
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DrugVariant.drug_id == drug_id,
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DrugVariant.strength == variant.strength
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).first()
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if existing:
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raise HTTPException(status_code=400, detail="Variant with this strength already exists for this drug")
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db_variant = DrugVariant(
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drug_id=drug_id,
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strength=variant.strength,
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quantity=variant.quantity,
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unit=variant.unit,
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low_stock_threshold=variant.low_stock_threshold
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)
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db.add(db_variant)
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db.commit()
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db.refresh(db_variant)
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return db_variant
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@router.get("/variants/{variant_id}", response_model=DrugVariantResponse)
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def get_drug_variant(variant_id: int, db: Session = Depends(get_db)):
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"""Get a specific drug variant"""
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variant = db.query(DrugVariant).filter(DrugVariant.id == variant_id).first()
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if not variant:
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raise HTTPException(status_code=404, detail="Drug variant not found")
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return variant
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@router.put("/variants/{variant_id}", response_model=DrugVariantResponse)
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def update_drug_variant(variant_id: int, variant_update: DrugVariantUpdate, db: Session = Depends(get_db)):
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"""Update a drug variant"""
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variant = db.query(DrugVariant).filter(DrugVariant.id == variant_id).first()
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if not variant:
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raise HTTPException(status_code=404, detail="Drug variant not found")
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for field, value in variant_update.dict(exclude_unset=True).items():
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setattr(variant, field, value)
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db.commit()
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db.refresh(variant)
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return variant
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@router.delete("/variants/{variant_id}")
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def delete_drug_variant(variant_id: int, db: Session = Depends(get_db)):
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"""Delete a drug variant"""
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variant = db.query(DrugVariant).filter(DrugVariant.id == variant_id).first()
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if not variant:
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raise HTTPException(status_code=404, detail="Drug variant not found")
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db.delete(variant)
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db.commit()
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return {"message": "Drug variant deleted successfully"}
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# Dispensing endpoints
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@router.post("/dispense", response_model=DispensingResponse)
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def dispense_drug(dispensing: DispensingCreate, db: Session = Depends(get_db)):
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"""Record a drug dispensing and reduce inventory"""
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# Check if drug variant exists
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variant = db.query(DrugVariant).filter(DrugVariant.id == dispensing.drug_variant_id).first()
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if not variant:
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raise HTTPException(status_code=404, detail="Drug variant not found")
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# Check if enough quantity available
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if variant.quantity < dispensing.quantity:
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raise HTTPException(
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status_code=400,
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detail=f"Insufficient quantity. Available: {variant.quantity}, Requested: {dispensing.quantity}"
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)
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# Reduce variant quantity
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variant.quantity -= dispensing.quantity
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db.commit()
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# Create dispensing record
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db_dispensing = Dispensing(**dispensing.dict())
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db.add(db_dispensing)
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db.commit()
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db.refresh(db_dispensing)
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return db_dispensing
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@router.get("/dispense/history", response_model=List[DispensingResponse])
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def list_dispensings(skip: int = 0, limit: int = 100, db: Session = Depends(get_db)):
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"""Get dispensing records (audit log)"""
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return db.query(Dispensing).order_by(Dispensing.dispensed_at.desc()).offset(skip).limit(limit).all()
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@router.get("/drugs/{drug_id}/dispense/history", response_model=List[DispensingResponse])
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def get_drug_dispensings(drug_id: int, db: Session = Depends(get_db)):
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"""Get dispensing history for a specific drug (all variants)"""
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# Verify drug exists
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drug = db.query(Drug).filter(Drug.id == drug_id).first()
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if not drug:
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raise HTTPException(status_code=404, detail="Drug not found")
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# Get all variant IDs for this drug
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variant_ids = db.query(DrugVariant.id).filter(DrugVariant.drug_id == drug_id).subquery()
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return db.query(Dispensing).filter(Dispensing.drug_variant_id.in_(variant_ids)).order_by(Dispensing.dispensed_at.desc()).all()
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@router.get("/variants/{variant_id}/dispense/history", response_model=List[DispensingResponse])
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def get_variant_dispensings(variant_id: int, db: Session = Depends(get_db)):
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"""Get dispensing history for a specific drug variant"""
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# Verify variant exists
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variant = db.query(DrugVariant).filter(DrugVariant.id == variant_id).first()
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if not variant:
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raise HTTPException(status_code=404, detail="Drug variant not found")
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return db.query(Dispensing).filter(Dispensing.drug_variant_id == variant_id).order_by(Dispensing.dispensed_at.desc()).all()
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# Include router with /api prefix
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app.include_router(router)
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