Squashed 'core/' content from commit 92ec910

git-subtree-dir: core
git-subtree-split: 92ec910a132e379a3a6e442a75bcb07cac0f0010

backend/app/core/config.py

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+from pydantic_settings import BaseSettings
+from functools import lru_cache
+import os
+
+import yaml
+
+
+class Settings(BaseSettings):
+    APP_NAME: str = "TianpuEMS"
+    DEBUG: bool = True
+    API_V1_PREFIX: str = "/api/v1"
+
+    # Customer configuration
+    CUSTOMER: str = "tianpu"  # tianpu, zpark, etc.
+    CUSTOMER_DISPLAY_NAME: str = ""  # Loaded from customer config
+
+    # Database: set DATABASE_URL in .env to override.
+    # Default: SQLite for local dev. Docker sets PostgreSQL via env var.
+    # Examples:
+    #   SQLite:      sqlite+aiosqlite:///./tianpu_ems.db
+    #   PostgreSQL:  postgresql+asyncpg://tianpu:tianpu2026@localhost:5432/tianpu_ems
+    DATABASE_URL: str = "sqlite+aiosqlite:///./tianpu_ems.db"
+    REDIS_URL: str = "redis://localhost:6379/0"
+
+    SECRET_KEY: str = "tianpu-ems-secret-key-change-in-production-2026"
+    ALGORITHM: str = "HS256"
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 480
+
+    CELERY_ENABLED: bool = False  # Set True when Celery worker is running
+    USE_SIMULATOR: bool = True  # True=simulator mode, False=real IoT collectors
+
+    # Infrastructure flags
+    TIMESCALE_ENABLED: bool = False
+    REDIS_ENABLED: bool = True
+    INGESTION_QUEUE_ENABLED: bool = False
+    AGGREGATION_ENABLED: bool = True
+
+    # SMTP Email settings
+    SMTP_HOST: str = ""
+    SMTP_PORT: int = 587
+    SMTP_USER: str = ""
+    SMTP_PASSWORD: str = ""
+    SMTP_FROM: str = "noreply@tianpu-ems.com"
+    SMTP_ENABLED: bool = False
+
+    # Platform URL for links in emails
+    PLATFORM_URL: str = "http://localhost:3000"
+
+    @property
+    def DATABASE_URL_SYNC(self) -> str:
+        """Derive synchronous URL from async DATABASE_URL for Alembic."""
+        url = self.DATABASE_URL
+        return url.replace("+aiosqlite", "").replace("+asyncpg", "+psycopg2")
+
+    @property
+    def is_sqlite(self) -> bool:
+        return "sqlite" in self.DATABASE_URL
+
+    @property
+    def customer_config_path(self) -> str:
+        """Search for customer config in multiple locations."""
+        backend_dir = os.path.dirname(os.path.dirname(os.path.dirname(__file__)))
+        # Standalone: project_root/customers/{CUSTOMER}/
+        path1 = os.path.join(backend_dir, "..", "customers", self.CUSTOMER)
+        if os.path.isdir(path1):
+            return os.path.abspath(path1)
+        # Subtree: customer_project_root/customers/{CUSTOMER}/ (core is 2 levels up)
+        path2 = os.path.join(backend_dir, "..", "..", "customers", self.CUSTOMER)
+        if os.path.isdir(path2):
+            return os.path.abspath(path2)
+        return os.path.abspath(path1)  # Default fallback
+
+    def load_customer_config(self) -> dict:
+        """Load customer-specific config from customers/{CUSTOMER}/config.yaml"""
+        config_file = os.path.join(self.customer_config_path, "config.yaml")
+        if os.path.exists(config_file):
+            with open(config_file, 'r', encoding='utf-8') as f:
+                return yaml.safe_load(f) or {}
+        return {}
+
+    class Config:
+        env_file = ".env"
+        extra = "ignore"
+
+
+@lru_cache
+def get_settings() -> Settings:
+    return Settings()