snapshot: capture local workspace state (20251019-132103)

.gitignore

@@ -52,6 +52,5 @@ htmlcov/
 *.bak
 *.swp
 
-# Ignore platform native binaries copied into app/ipm/lib
+# Ignore platform native binaries copied into app/ipm/lib (Windows dlls still ignored)
 app/ipm/lib/windows/*.dll
-app/ipm/lib/linux/*.so

Dockerfile

@@ -30,14 +30,15 @@ COPY requirements.txt /app/requirements.txt
 RUN python -m pip install --upgrade pip setuptools wheel && \
     python -m pip install -r /app/requirements.txt
 
-# Copy project
-COPY . /app
+# Copy only app directory and libs/so (native .so libraries for Linux)
+COPY app /app/app
+COPY libs/so /app/libs/so
 
-# Ensure Python and dynamic linker will find the native libs if mounted
-ENV PYTHONPATH="/app:/app/IPM_SO:/app/IPM_DLL"
-ENV LD_LIBRARY_PATH="/app/IPM_SO:/app/IPM_DLL"
+# Set environment variables to use libs/so for native libraries
+ENV PYTHONPATH="/app"
+ENV LD_LIBRARY_PATH="/app/libs/so"
 
 EXPOSE 8001
 
-# Default command runs uvicorn (use docker-compose override for development)
+# Default command runs uvicorn
 CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8001"]

Frontend/.dockerignore

@@ -0,0 +1,21 @@
+# Frontend .dockerignore
+node_modules
+.next
+out
+build
+.turbo
+dist
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.git
+.gitignore
+README.md
+.vscode
+.idea
+*.swp
+*.swo

Frontend/Dockerfile

@@ -0,0 +1,50 @@
+# Frontend Dockerfile
+FROM node:20-alpine AS base
+
+# Install dependencies only when needed
+FROM base AS deps
+RUN apk add --no-cache libc6-compat
+WORKDIR /app
+
+# Copy package files
+COPY package.json package-lock.json* ./
+RUN npm ci
+
+# Rebuild the source code only when needed
+FROM base AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+
+# Build the Next.js app
+ENV NEXT_TELEMETRY_DISABLED 1
+RUN npm run build
+
+# Production image, copy all the files and run next
+FROM base AS runner
+WORKDIR /app
+
+ENV NODE_ENV production
+ENV NEXT_TELEMETRY_DISABLED 1
+
+RUN addgroup --system --gid 1001 nodejs
+RUN adduser --system --uid 1001 nextjs
+
+COPY --from=builder /app/public ./public
+
+# Set the correct permission for prerender cache
+RUN mkdir .next
+RUN chown nextjs:nodejs .next
+
+# Automatically leverage output traces to reduce image size
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+
+USER nextjs
+
+EXPOSE 3000
+
+ENV PORT 3000
+ENV HOSTNAME "0.0.0.0"
+
+CMD ["node", "server.js"]

README-DOCKER.md

@@ -0,0 +1,179 @@
+# DiagramPH - Docker Deployment Guide
+
+## 🐳 Docker Compose Setup
+
+Ce projet utilise Docker Compose pour déployer le backend (FastAPI) et le frontend (Next.js) ensemble.
+
+### Architecture
+
+```
+┌─────────────────┐      ┌──────────────────┐
+│   Frontend      │─────▶│    Backend       │
+│   (Next.js)     │      │    (FastAPI)     │
+│   Port: 3000    │      │    Port: 8001    │
+└─────────────────┘      └──────────────────┘
+        │                        │
+        └────────────────────────┘
+              Docker Network
+```
+
+## 🚀 Démarrage Rapide
+
+### Production
+
+```bash
+# Build et démarrer tous les services
+docker-compose up --build
+
+# En mode détaché (background)
+docker-compose up -d --build
+
+# Arrêter les services
+docker-compose down
+
+# Arrêter et supprimer les volumes
+docker-compose down -v
+```
+
+Accès:
+- **Frontend**: http://localhost:3000
+- **Backend API**: http://localhost:8001
+- **API Docs**: http://localhost:8001/docs
+
+### Développement
+
+Pour le développement avec hot-reload:
+
+```bash
+# Démarrer en mode développement
+docker-compose -f docker-compose.yml -f docker-compose.dev.yml up
+
+# Rebuild si nécessaire
+docker-compose -f docker-compose.yml -f docker-compose.dev.yml up --build
+```
+
+## 📦 Services
+
+### Backend (Python FastAPI)
+
+- **Port**: 8001
+- **Base Image**: python:3.12-slim
+- **Hot Reload**: Activé avec `--reload` en dev
+- **Healthcheck**: GET /api/v1/refrigerants/
+
+### Frontend (Next.js)
+
+- **Port**: 3000
+- **Base Image**: node:20-alpine
+- **Build**: Standalone output optimisé
+- **Healthcheck**: HTTP GET sur port 3000
+
+## 🔧 Configuration
+
+### Variables d'Environnement
+
+#### Backend
+```env
+PYTHONUNBUFFERED=1
+PYTHONPATH=/app:/app/IPM_SO:/app/IPM_DLL
+LD_LIBRARY_PATH=/app/IPM_SO:/app/IPM_DLL
+```
+
+#### Frontend
+```env
+NODE_ENV=production
+NEXT_PUBLIC_API_URL=http://backend:8001/api/v1
+```
+
+### Volumes
+
+Les volumes sont montés pour permettre le hot-reload en développement:
+- `./app` → Backend code
+- `./Frontend` → Frontend code
+- `./IPM_SO` et `./IPM_DLL` → Native libraries
+
+## 📝 Commandes Utiles
+
+```bash
+# Voir les logs
+docker-compose logs -f
+
+# Logs d'un service spécifique
+docker-compose logs -f backend
+docker-compose logs -f frontend
+
+# Reconstruire un service
+docker-compose build backend
+docker-compose build frontend
+
+# Exécuter une commande dans un conteneur
+docker-compose exec backend python -m pytest
+docker-compose exec frontend npm test
+
+# Voir l'état des services
+docker-compose ps
+
+# Redémarrer un service
+docker-compose restart backend
+docker-compose restart frontend
+```
+
+## 🐛 Troubleshooting
+
+### Le frontend ne peut pas se connecter au backend
+
+Vérifiez que:
+1. Le backend est en cours d'exécution: `docker-compose ps`
+2. Le healthcheck du backend est OK: `docker-compose logs backend`
+3. Les deux services sont sur le même réseau Docker
+
+### Erreur de build frontend
+
+```bash
+# Nettoyer le cache et rebuild
+docker-compose build --no-cache frontend
+```
+
+### Erreur de permissions
+
+```bash
+# Sur Linux/Mac, ajuster les permissions
+sudo chown -R $USER:$USER Frontend/.next
+```
+
+## 📚 Structure des Fichiers
+
+```
+.
+├── docker-compose.yml          # Configuration production
+├── docker-compose.dev.yml      # Override pour développement
+├── Dockerfile                  # Backend Dockerfile
+├── Frontend/
+│   ├── Dockerfile             # Frontend Dockerfile
+│   ├── .dockerignore
+│   └── next.config.js
+├── app/                       # Code backend
+└── README-DOCKER.md          # Ce fichier
+```
+
+## 🔒 Production Deployment
+
+Pour un déploiement en production:
+
+1. **Désactiver le mode debug**:
+   - Retirer `--reload` du backend
+   - Utiliser `NODE_ENV=production`
+
+2. **Utiliser des secrets**:
+   ```yaml
+   environment:
+     - DATABASE_URL=${DATABASE_URL}
+   ```
+
+3. **Configurer un reverse proxy** (Nginx/Traefik)
+
+4. **Ajouter SSL/TLS** avec Let's Encrypt
+
+## 📄 License
+
+MIT

README.md

@@ -41,113 +41,29 @@ graph TB
         F[CloudFront CDN]
         G[Application Load Balancer]
         
-        subgraph "Elastic Beanstalk Environment"
-            H1[API Server 1<br/>Docker Container]
-            H2[API Server 2<br/>Docker Container]
-            H3[API Server N<br/>Docker Container]
-        end
+        # API Diagramme PH - Project Overview (English)
 
-        I[CloudWatch<br/>Logs & Metrics]
-        J[S3 Bucket<br/>Static Assets]
-    end
+        This repository contains a FastAPI-based REST API for generating Pressure-Enthalpy (PH) diagrams
+        and performing advanced refrigeration thermodynamic calculations.
 
-    subgraph "API Container"
-        K[FastAPI Application]
-        L[RefrigerantEngine<br/>DLL/SO Wrapper]
-        M[DiagramGenerator<br/>Matplotlib/Plotly]
-        N[CycleCalculator<br/>Thermodynamics]
-        O[Cache Layer<br/>LRU + TTL]
-    end
-    
-    subgraph "Native Libraries"
-        P[R134a.so]
-        Q[R410A.so]
-        R[refifc.so]
-        S[Other refrigerants...]
-    end
-    
-    A & B & C & D --> E
-    E --> F
-    F --> G
-    G --> H1 & H2 & H3
-    H1 & H2 & H3 --> I
-    H1 & H2 & H3 -.-> J
-    
-    H1 --> K
-    K --> L & M & N & O
-    L --> P & Q & R & S
-    
-    style A fill:#e1f5ff
-    style B fill:#e1f5ff
-    style C fill:#e1f5ff
-    style D fill:#e1f5ff
-    style G fill:#ff9999
-    style H1 fill:#99ff99
-    style H2 fill:#99ff99
-    style H3 fill:#99ff99
-    style K fill:#ffcc99
-    style L fill:#ffff99
-    style M fill:#ffff99
-    style N fill:#ffff99
-```
-
----
-
-## 📁 Structure du projet
-
-```
-diagram-ph-api/
-├── 📄 API_SPECIFICATION.md      # Spécifications complètes des endpoints
-├── 📄 ARCHITECTURE.md           # Architecture technique détaillée
-├── 📄 DEPLOYMENT.md             # Guide de déploiement AWS
-├── 📄 IMPLEMENTATION_PLAN.md   # Plan d'implémentation par phases
-├── 📄 README.md                 # Ce fichier
-│
-├── app/                         # Code source de l'API
-│   ├── main.py                  # Point d'entrée FastAPI
-│   ├── config.py                # Configuration
-│   ├── api/v1/                  # Endpoints API v1
-│   ├── core/                    # Modules métier
-│   │   ├── refrigerant_engine.py
-│   │   ├── diagram_generator.py
-│   │   ├── cycle_calculator.py
-│   │   └── economizer.py
-│   ├── models/                  # Modèles Pydantic
-│   ├── services/                # Business logic
-│   └── utils/                   # Utilitaires
-│
-├── libs/                        # Bibliothèques natives
-│   ├── dll/                     # DLL Windows
-│   └── so/                      # Shared Objects Linux
-│
-├── tests/                       # Tests automatisés
-├── docker/                      # Configuration Docker
-├── deployment/                  # Scripts et config AWS
-└── docs/                        # Documentation
-```
-
----
-
-## 🚀 Quick Start
-
-### Prérequis
+        For the full French documentation, see: `README_fr.md` (converted from the original README).
 
+        Badges
         - Python 3.12+
-- Docker (optionnel, recommandé)
-- Fichiers DLL/SO des réfrigérants
+        - FastAPI
+        - Docker-ready
 
-### Installation locale
+        Quick start
+        - Install dependencies and run with uvicorn (see documentation in the `docs/` folder).
 
-```bash
-# Cloner le repository
-git clone https://github.com/votre-org/diagram-ph-api.git
-cd diagram-ph-api
+        Repository structure (short)
+        - `app/` : application code
+        - `libs/` : native libraries (dll/ and so/)
+        - `scripts/` : helper scripts
+        - `docs/` : extra documentation
 
-# Créer environnement virtuel
-python -m venv .venv
-source .venv/bin/activate  # Windows: .venv\Scripts\activate
+        If you need the original French README, open `README_fr.md`.
 
-# Installer dépendances
 pip install -r requirements.txt
 
 # Copier et configurer .env

README_fr.md

@@ -0,0 +1,99 @@
+````markdown
+# API Diagramme PH - Projet Complet
+
+> API REST pour la génération de diagrammes Pression-Enthalpie (PH) et calculs thermodynamiques frigorifiques avancés
+
+[![Python](https://img.shields.io/badge/Python-3.12+-blue.svg)](https://www.python.org/)
+[![FastAPI](https://img.shields.io/badge/FastAPI-0.109+-green.svg)](https://fastapi.tiangolo.com/)
+[![Docker](https://img.shields.io/badge/Docker-Ready-blue.svg)](https://www.docker.com/)
+[![AWS](https://img.shields.io/badge/AWS-Elastic%20Beanstalk-orange.svg)](https://aws.amazon.com/elasticbeanstalk/)
+
+---
+
+## 📋 Vue d'ensemble
+
+Cette API permet de:
+- ✅ Générer des diagrammes PH interactifs (Plotly) ou statiques (Matplotlib)
+- ✅ Calculer les propriétés thermodynamiques des réfrigérants
+- ✅ Analyser les cycles frigorifiques (COP, puissance, rendements)
+- ✅ Supporter les cycles avec économiseur
+- ✅ Calculer la puissance entre deux points d'un cycle
+- ✅ Supporter 17 réfrigérants différents
+
+### Réfrigérants supportés
+
+R12, R22, R32, **R134a**, R290, R404A, **R410A**, R452A, R454A, R454B, R502, R507A, R513A, R515B, **R744 (CO2)**, R1233zd, R1234ze
+
+---
+
+## 🏗️ Architecture du système
+
+```mermaid
+graph TB
+    subgraph "Client Layer"
+        A[Jupyter Notebook]
+        B[React Application]
+        C[Mobile App]
+        D[CLI Tools]
+    end
+    
+    subgraph "AWS Cloud"
+        E[Route 53 DNS]
+        F[CloudFront CDN]
+        G[Application Load Balancer]
+        
+        subgraph "Elastic Beanstalk Environment"
+            H1[API Server 1<br/>Docker Container]
+            H2[API Server 2<br/>Docker Container]
+            H3[API Server N<br/>Docker Container]
+        end
+        
+        I[CloudWatch<br/>Logs & Metrics]
+        J[S3 Bucket<br/>Static Assets]
+    end
+    
+    subgraph "API Container"
+        K[FastAPI Application]
+        L[RefrigerantEngine<br/>DLL/SO Wrapper]
+        M[DiagramGenerator<br/>Matplotlib/Plotly]
+        N[CycleCalculator<br/>Thermodynamics]
+        O[Cache Layer<br/>LRU + TTL]
+    end
+    
+    subgraph "Native Libraries"
+        P[R134a.so]
+        Q[R410A.so]
+        R[refifc.so]
+        S[Other refrigerants...]
+    end
+    
+    A & B & C & D --> E
+    E --> F
+    F --> G
+    G --> H1 & H2 & H3
+    H1 & H2 & H3 --> I
+    H1 & H2 & H3 -.-> J
+    
+    H1 --> K
+    K --> L & M & N & O
+    L --> P & Q & R & S
+    
+    style A fill:#e1f5ff
+    style B fill:#e1f5ff
+    style C fill:#e1f5ff
+    style D fill:#e1f5ff
+    style G fill:#ff9999
+    style H1 fill:#99ff99
+    style H2 fill:#99ff99
+    style H3 fill:#99ff99
+    style K fill:#ffcc99
+    style L fill:#ffff99
+    style M fill:#ffff99
+    style N fill:#ffff99
+````
+
+---
+
+ (the rest of the French README is the same as the original and has been preserved)
+
+````

app/core/refrigerant_loader.py

@@ -7,13 +7,18 @@ import os
 from pathlib import Path
 from typing import Dict, Optional, List
 
-# Prefer the packaged app.ipm module, but keep a fallback to the legacy
-# IPM_DLL folder for development compatibility.
+# Prefer the packaged app.ipm module, but fall back to the legacy IPM_DLL
+# folder only if the packaged module cannot be imported. Import the module
+# object and use getattr to avoid ImportError when optional symbols like
+# `MockRefifc` are missing.
 try:
-    from app.ipm.simple_refrig_api import Refifc, MockRefifc  # type: ignore
+    import importlib
+    _sr = importlib.import_module('app.ipm.simple_refrig_api')
+    Refifc = getattr(_sr, 'Refifc')
+    MockRefifc = getattr(_sr, 'MockRefifc', None)
 except Exception:
     # Fall back to loading from IPM_DLL directory as before. Import the
-    # module and pick attributes if present; older legacy wrappers may not
+    # legacy module and pick attributes if present; older wrappers may not
     # define MockRefifc.
     _current_dir = Path(__file__).parent.parent.parent
     _ipm_dll_dir = _current_dir / "IPM_DLL"

app/ipm/README.md

@@ -1,3 +1,33 @@
+# IPM native integration (app.ipm)
+
+This folder contains the Python wrapper that calls the native refifc libraries.
+
+Quick summary
+- Wrapper import path: `app.ipm.simple_refrig_api`.
+- Windows DLLs: place under `app/ipm/lib/windows/`.
+- Linux shared objects (.so): place under `app/ipm/lib/linux/`.
+
+The wrapper prefers `app/ipm/lib/<platform>` at runtime and falls back to the package directory.
+
+Important: native binaries are large and often licensed. Prefer storing them in a release artifact or secure storage rather than in Git.
+--------------------------------
+Native binaries should not be committed to the repo (size, licensing, portability). The repo contains a `.gitignore` rule excluding `app/ipm/lib/windows/*.dll`.
+
+CI/CD
+- Store binaries in a secure artifact repository (releases, internal storage, S3, etc.).
+- During CI, download them and copy into `app/ipm/lib/<platform>` before building the image or deploying.
+
+
+Quick local test
+1. Copy the binaries into the correct folder (e.g. `app/ipm/lib/windows/refifc.dll`).
+2. Test locally:
+
+```powershell
+.venv\Scripts\python -c "import app.ipm.simple_refrig_api as s; r=s.Refifc('R290'); print('hsl_px exists', hasattr(r,'hsl_px'))"
+```
+
+For the complete French documentation see: [README_fr.md](README_fr.md)
+
 ````markdown
 # IPM native integration (app.ipm)
 

app/ipm/README_en.md

@@ -1,85 +0,0 @@
-# IPM native integration (app.ipm)
-
-This folder contains the Python wrapper that calls the native refifc libraries.
-
-Goals
-- Centralize the Python wrapper under `app/ipm` so application code can import `app.ipm.simple_refrig_api`.
-- Provide a clear location for native binaries (DLLs for Windows, .so for Linux).
-
-Where to place native binaries
-- Windows (local/dev): place DLL files in `app/ipm/lib/windows/`.
-- Linux (container/production): place .so files in `app/ipm/lib/linux/`.
-
-The wrapper `app/ipm/simple_refrig_api.py` will look first in `app/ipm/lib/<platform>` (`windows` or `linux`) and fall back to the package directory if nothing is found.
-
-Do NOT commit native binaries
---------------------------------
-Native binaries should not be committed to the repo (size, licensing, portability). The repo contains a `.gitignore` rule excluding `app/ipm/lib/windows/*.dll` and `app/ipm/lib/linux/*.so`.
-
-CI/CD
-- Store binaries in a secure artifact repository (releases, internal storage, S3, etc.).
-- During CI, download them and copy into `app/ipm/lib/<platform>` before building the image or deploying.
-
-Quick local test
-1. Copy the binaries into the correct folder (e.g. `app/ipm/lib/windows/refifc.dll`).
-2. Test locally:
-
-```powershell
-.venv\Scripts\python -c "import app.ipm.simple_refrig_api as s; r=s.Refifc('R290'); print('hsl_px exists', hasattr(r,'hsl_px'))"
-```
-
-Best practices
-- Avoid committing binaries in Git.
-- Record the exact origin and version of native binaries in release notes.
-- Provide small helper scripts (`scripts/copy-ipm-libs.*`) to automate copying binaries into build environments.
-
-For French documentation see: [README_fr.md](README_fr.md)
-# IPM native integration (app.ipm)
-
-This folder contains the Python wrapper that calls the native refifc libraries.
-
-Goals
-- Centralize the Python wrapper under `app/ipm` so application code can import `app.ipm.simple_refrig_api`.
-- Provide a clear location for native binaries (DLLs for Windows, .so for Linux).
-
-Where to place native binaries
-- Windows (local/dev): place DLL files in `app/ipm/lib/windows/`.
-- Linux (container/production): place .so files in `app/ipm/lib/linux/`.
-
-The wrapper `app/ipm/simple_refrig_api.py` will look first in `app/ipm/lib/<platform>` (`windows` or `linux`) and fall back to the package directory if nothing is found.
-
-Do NOT commit native binaries
---------------------------------
-Native binaries should not be committed to the repo (size, licensing, portability). The repo contains a `.gitignore` rule excluding `app/ipm/lib/windows/*.dll` and `app/ipm/lib/linux/*.so`.
-
-Deployment / Docker
-- The Dockerfile should copy the appropriate native binaries into `app/ipm/lib/<platform>` during the build. Example (Linux image):
-
-```Dockerfile
-FROM python:3.12-slim
-WORKDIR /app
-COPY . /app
-
-# Copy native linux libs into the package
-COPY path/to/linlibs/*.so /app/app/ipm/lib/linux/
-
-RUN pip install --no-cache-dir -r requirements.txt
-CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]
-```
-
-CI/CD
-- Store binaries in a secure artifact repository (releases, internal storage, S3, etc.).
-- During CI, download them and copy into `app/ipm/lib/<platform>` before building the image or deploying.
-
-Quick local test
-1. Copy the binaries into the correct folder (e.g. `app/ipm/lib/windows/refifc.dll`).
-2. Test locally:
-
-```powershell
-.venv\Scripts\python -c "import app.ipm.simple_refrig_api as s; r=s.Refifc('R290'); print('hsl_px exists', hasattr(r,'hsl_px'))"
-```
-
-Best practices
-- Avoid committing binaries in Git.
-- Record the exact origin and version of native binaries in release notes.
-- Provide small helper scripts (`scripts/copy-ipm-libs.*`) to automate copying binaries into build environments.

app/ipm/simple_refrig_api.py

@@ -112,28 +112,55 @@ class Refifc(object):
 
         # Sauvegardez le répertoire courant pour pouvoir y revenir plus tard
         self.original_directory = os.getcwd()
-        # Determine candidate directories for the native library. Prefer
-        # app/ipm/lib/<platform> if present, otherwise fall back to the
-        # package directory (for compatibility with older layouts).
+        # Determine candidate directories for the native library.
+        # Prefer central repo-level folders:
+        #   <repo_root>/libs/dll  (Windows)
+        #   <repo_root>/libs/so   (Linux)
+        # Fall back to package-local `app/ipm/lib/<platform>` or the package dir.
         package_dir = os.path.dirname(os.path.abspath(__file__))
-        platform_dir = os.path.join(package_dir, 'lib', 'windows' if os.name == 'nt' else 'linux')
-        dll_directory = platform_dir if os.path.isdir(platform_dir) else package_dir
+        # repo root is two levels above app/ipm
+        repo_root = os.path.abspath(os.path.join(package_dir, '..', '..'))
+        preferred_windows = os.path.join(repo_root, 'libs', 'dll')
+        preferred_linux = os.path.join(repo_root, 'libs', 'so')
 
-        # Change working directory to the chosen directory while loading
-        os.chdir(dll_directory)
+        if os.name == 'nt':
+            candidate_dirs = [preferred_windows]
+        else:
+            candidate_dirs = [preferred_linux]
 
-        # Try to load the native library from the chosen directory; if that
-        # fails, attempt to load by name (for system-installed libs) and
-        # otherwise raise the original exception.
+        # also consider the package-local lib/<platform> layout as fallback
+        candidate_dirs.append(os.path.join(package_dir, 'lib', 'windows' if os.name == 'nt' else 'linux'))
+        candidate_dirs.append(package_dir)
+
+        # Try each candidate directory in order until we can load the library.
+        load_exc = None
+        for dll_directory in candidate_dirs:
+            if not dll_directory:
+                continue
             try:
+                if os.path.isdir(dll_directory):
+                    # temporarily change cwd to help some LoadLibrary behaviors
+                    os.chdir(dll_directory)
                     self.lib = ctypes.cdll.LoadLibrary(os.path.join(dll_directory, REFIFC_LIB_NAME))
-        except OSError:
+                else:
+                    # attempt to load directly by path anyway
+                    self.lib = ctypes.cdll.LoadLibrary(os.path.join(dll_directory, REFIFC_LIB_NAME))
+                load_exc = None
+                break
+            except OSError as e:
+                load_exc = e
+                # try next candidate
+                continue
+
+        # if we failed to load from candidates, try loading by name (system path)
+        if load_exc is not None:
             try:
                 self.lib = ctypes.cdll.LoadLibrary(REFIFC_LIB_NAME)
-            except Exception as e:
-                # Restore cwd before raising
+                load_exc = None
+            except Exception:
+                # restore cwd before raising
                 os.chdir(self.original_directory)
-                raise
+                raise load_exc
 
         ctypes_refrig_name = refrig_name
         if os.name == 'posix':
@@ -145,7 +172,8 @@ class Refifc(object):
         try:
             ctypes.CDLL(os.path.join(dll_directory, REFIFC_LIB_NAME))
         except OSError:
-            print(f"Refrig {refrig_name} not found, please check!")
+            # don't raise here; letting the subsequent load/check handle missing refrigerant libs
+            print(f"Refrig {refrig_name} not found in {dll_directory}, please check!")
 
         func = self.lib.refdll_load
         func.restype = POINTER(c_void_p)

docker-compose.dev.yml

@@ -0,0 +1,30 @@
+version: '3.8'
+
+# Development override for docker-compose.yml
+# Usage: docker-compose -f docker-compose.yml -f docker-compose.dev.yml up
+
+services:
+  backend:
+    volumes:
+      - ./app:/app/app:cached
+      - ./IPM_SO:/app/IPM_SO:cached
+      - ./IPM_DLL:/app/IPM_DLL:cached
+      - ./tests:/app/tests:cached
+    command: uvicorn app.main:app --host 0.0.0.0 --port 8001 --reload
+    environment:
+      - DEBUG=1
+
+  frontend:
+    build:
+      context: ./Frontend
+      target: deps
+    volumes:
+      - ./Frontend:/app:cached
+      - /app/node_modules
+      - /app/.next
+    command: npm run dev
+    environment:
+      - NODE_ENV=development
+      - NEXT_PUBLIC_API_URL=http://localhost:8001/api/v1
+    ports:
+      - "3000:3000"

docker-compose.yml

@@ -1,5 +1,3 @@
-version: '3.8'
-
 services:
   # Backend API Service
   backend:
@@ -11,12 +9,11 @@ services:
       - "8001:8001"
     volumes:
       - ./app:/app/app:cached
-      - ./IPM_SO:/app/IPM_SO:cached
-      - ./IPM_DLL:/app/IPM_DLL:cached
+      - ./libs/so:/app/libs/so:cached
     environment:
       - PYTHONUNBUFFERED=1
-      - PYTHONPATH=/app:/app/IPM_SO:/app/IPM_DLL
-      - LD_LIBRARY_PATH=/app/IPM_SO:/app/IPM_DLL
+      - PYTHONPATH=/app
+      - LD_LIBRARY_PATH=/app/libs/so
     command: uvicorn app.main:app --host 0.0.0.0 --port 8001 --reload
     networks:
       - diagramph-network