import os

from fastapi import APIRouter

from .. import database as db, config

router = APIRouter(prefix="/api/settings", tags=["settings"])

# Only global (GLOBAL_SETTINGS) keys live here; campaign settings are under /api/campaigns/{id}/settings.

_ENV_OVERRIDES = {
    "onboarding_completed": "NAT20_ONBOARDING_COMPLETED",
}

_BOOL_KEYS = {"onboarding_completed"}


def _coerce(key: str, value: str):
    if key in _BOOL_KEYS:
        return str(value).lower() in ("1", "true", "yes")
    return value


def _merge_with_env(raw: dict) -> dict:
    """Priority: explicit user DB saves (non-default) > env vars > GLOBAL_SETTINGS."""
    merged = {**config.GLOBAL_SETTINGS}
    for key, env_name in _ENV_OVERRIDES.items():
        val = os.environ.get(env_name)
        if val is not None:
            merged[key] = val
    for key, val in raw.items():
        db_val = val.strip()
        if db_val and db_val != config.GLOBAL_SETTINGS.get(key, ""):
            merged[key] = db_val
    return merged


@router.get("")
async def get_settings():
    raw = db.get_settings()
    merged = _merge_with_env(raw)
    return {k: _coerce(k, v) for k, v in merged.items()}


@router.post("")
async def update_settings(patch: dict):
    clean = {k: str(v) for k, v in patch.items() if k in config.GLOBAL_SETTINGS}
    db.update_settings(clean)
    raw = db.get_settings()
    merged = _merge_with_env(raw)
    return {k: _coerce(k, v) for k, v in merged.items()}