"""Users — profile + role assignment (v2.6, Casdoor-backed).

GET /users/me — the caller's profile: role, PM's project, display name.
PATCH /users/{id} — assign role (admin only).
"""
from fastapi import APIRouter, Depends
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.auth import UserContext, get_current_user, require_role
from app.db.engine import get_db
from app.models.procurement import Project, User
from app.schemas.procurement import UserRoleUpdate
from app.utils.errors import NotFoundError
from app.utils.serialization import to_iso

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

USER_ROLE_LABELS = {
    "pm": "مدیر پروژه",
    "procurement_manager": "مدیر تدارکات",
    "admin": "ادمین",
}


def user_to_dict(user: User, project: Project | None = None) -> dict:
    return {
        "id": str(user.id),
        "casdoor_id": user.casdoor_id,
        "first_name": user.first_name,
        "last_name": user.last_name,
        "phone": user.phone,
        "role": user.role,
        "role_label": USER_ROLE_LABELS.get(user.role) if user.role else None,
        "project_id": str(project.id) if project else None,
        "project_name": project.name if project else None,
        "created_at": to_iso(user.created_at),
    }


@router.get("/me")
async def me(ctx: UserContext = Depends(get_current_user), db: AsyncSession = Depends(get_db)):
    project = await db.scalar(select(Project).where(Project.pm_user_id == ctx.user.id)) if ctx.role == "pm" else None
    return {"data": user_to_dict(ctx.user, project)}


@router.patch("/{user_id}")
async def update_user_role(
    user_id,
    payload: UserRoleUpdate,
    _: UserContext = Depends(require_role("admin")),
    db: AsyncSession = Depends(get_db),
):
    user = await db.get(User, user_id)
    if user is None:
        raise NotFoundError("کاربر یافت نشد")
    user.role = payload.role
    await db.flush()
    project = await db.scalar(select(Project).where(Project.pm_user_id == user.id)) if user.role == "pm" else None
    return {"data": user_to_dict(user, project)}