from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session
from datetime import datetime, timezone

from database import get_db
from models.settings import PosSettings
from schemas.settings import UpdateSettingRequest
from routers.deps import get_current_user, require_manager
from models.user import User

router = APIRouter()

VALID_SETTINGS = {
    "shifts.waiter_self_start": "Allow waiters to start their own shifts without manager action",
    "shifts.waiter_self_end": "Allow waiters to end their own shifts without manager action",
    "business_day.force_close_allowed": "Allow force-closing business day with open tables",
    "system.timezone": "IANA timezone name used by the backend container (e.g. Europe/Athens). Requires container restart to take effect.",
    "ui.table_colours": "JSON blob of table card colour scheme (light + dark modes) for the Waiter PWA.",
    "dev.spoof_printing": "When enabled, all print jobs are silently dropped. Devices behave as if printing succeeded.",
}

DEFAULTS = {
    "shifts.waiter_self_start": "true",
    "shifts.waiter_self_end": "true",
    "business_day.force_close_allowed": "true",
    "system.timezone": "Europe/Athens",
    "ui.table_colours": "",
    "dev.spoof_printing": "false",
}


@router.get("/")
def get_all_settings(
    db: Session = Depends(get_db),
    user: User = Depends(get_current_user),
):
    stored = {s.key: s.value for s in db.query(PosSettings).all()}
    result = {}
    for key, description in VALID_SETTINGS.items():
        result[key] = {
            "value": stored.get(key, DEFAULTS.get(key, "true")),
            "description": description,
        }
    return result


@router.put("/{key}")
def update_setting(
    key: str,
    body: UpdateSettingRequest,
    db: Session = Depends(get_db),
    user: User = Depends(require_manager),
):
    if key not in VALID_SETTINGS:
        raise HTTPException(status_code=400, detail=f"Unknown setting key: {key}")

    setting = db.query(PosSettings).filter(PosSettings.key == key).first()
    if setting:
        setting.value = body.value
        setting.updated_at = datetime.now(timezone.utc)
        setting.updated_by_id = user.id
    else:
        setting = PosSettings(key=key, value=body.value, updated_by_id=user.id)
        db.add(setting)

    db.commit()
    db.refresh(setting)
    return {"key": setting.key, "value": setting.value}