Add configuration and database core

app/config.py

@@ -1 +1,47 @@
 """Application configuration."""
+
+from __future__ import annotations
+
+import os
+from dataclasses import dataclass
+from pathlib import Path
+
+
+def load_dotenv(path: str | Path = ".env") -> None:
+    env_path = Path(path)
+    if not env_path.exists():
+        return
+    for raw_line in env_path.read_text().splitlines():
+        line = raw_line.strip()
+        if not line or line.startswith("#") or "=" not in line:
+            continue
+        key, value = line.split("=", 1)
+        os.environ.setdefault(key.strip(), value.strip().strip('"').strip("'"))
+
+
+@dataclass(slots=True)
+class Settings:
+    db_path: str = "./quiz.db"
+    secret_key: str | None = None
+    admin_password: str | None = None
+    host: str = "127.0.0.1"
+    port: int = 8001
+    public_url: str = "https://quiz.ahkhan.me"
+    log_level: str = "INFO"
+
+    @classmethod
+    def from_env(cls) -> "Settings":
+        load_dotenv()
+        return cls(
+            db_path=os.getenv("QUIZ_DB_PATH", "./quiz.db"),
+            secret_key=os.getenv("QUIZ_SECRET_KEY"),
+            admin_password=os.getenv("QUIZ_ADMIN_PASSWORD"),
+            host=os.getenv("QUIZ_HOST", "127.0.0.1"),
+            port=int(os.getenv("QUIZ_PORT", "8001")),
+            public_url=os.getenv("QUIZ_PUBLIC_URL", "https://quiz.ahkhan.me").rstrip("/"),
+            log_level=os.getenv("QUIZ_LOG_LEVEL", "INFO"),
+        )
+
+    @property
+    def secure_cookies(self) -> bool:
+        return self.public_url.startswith("https://")