"""
app/services/user_admin_service.py — 管理员账号管理 service
仅 admin 可调（路由层 require_admin 守卫）。
建号/列号/启禁用，全部限定在调用者所在 workspace 内。
禁用=软删除(is_active=False)，可随时恢复(倩倩姐2026-06-30拍板)；不物理删除。
"""

import logging

from sqlalchemy import func
from sqlalchemy.orm import Session

from app.constants.enums import UserRole
from app.core.response import raise_business, raise_not_found, raise_param_error
from app.models.user import LoginRecord, User
from app.models.workspace import WorkspaceMember
from app.services.auth_service import DEFAULT_SEED_PASSWORD, hash_password

logger = logging.getLogger(__name__)

_VALID_ROLES = {r.value for r in UserRole}


def list_workspace_users(db: Session, workspace_id: int) -> list[dict]:
    """列出本 workspace 的所有成员（含禁用），带角色与最后登录时间。"""
    rows = (
        db.query(User, WorkspaceMember.role)
        .join(WorkspaceMember, WorkspaceMember.user_id == User.id)
        .filter(WorkspaceMember.workspace_id == workspace_id)
        .order_by(User.id)
        .all()
    )
    result: list[dict] = []
    for user, role in rows:
        last = (
            db.query(func.max(LoginRecord.created_at))
            .filter(LoginRecord.user_id == user.id)
            .scalar()
        )
        # role 可能是 UserRole 枚举对象，统一取字符串值给前端匹配 ROLE_LABELS
        role_str = role.value if hasattr(role, "value") else str(role)
        result.append({
            "id": user.id,
            "username": user.username,
            "email": user.email,
            "role": role_str,
            "is_active": bool(user.is_active),
            "must_change_password": bool(user.must_change_password),
            "last_login_at": last.isoformat() if last else None,
        })
    return result


def create_workspace_user(
    db: Session, workspace_id: int, username: str, email: str,
    role: str, init_password: str,
) -> dict:
    """管理员建号：建 User + 绑 WorkspaceMember，强制首登改密。"""
    username, email = username.strip(), email.strip().lower()
    if not username or not email:
        raise_param_error("用户名和邮箱不能为空")
    if role not in _VALID_ROLES:
        raise_param_error(f"角色非法，仅支持 {sorted(_VALID_ROLES)}")
    if len(init_password) < 8:
        raise_param_error("初始密码至少 8 位")
    if init_password == DEFAULT_SEED_PASSWORD:
        raise_param_error("初始密码不能使用系统默认密码")
    if db.query(User).filter(User.username == username).first():
        raise_business("用户名已存在")
    if db.query(User).filter(User.email == email).first():
        raise_business("邮箱已被占用")

    user = User(
        username=username, email=email,
        hashed_password=hash_password(init_password),
        is_active=True, must_change_password=True,
    )
    db.add(user)
    db.flush()
    db.add(WorkspaceMember(workspace_id=workspace_id, user_id=user.id, role=role))
    db.commit()
    logger.info("admin created user=%s role=%s in ws=%s", username, role, workspace_id)
    return {"id": user.id, "username": user.username, "role": role}


def set_user_active(
    db: Session, workspace_id: int, target_user_id: int,
    is_active: bool, operator_user_id: int,
) -> dict:
    """启用/禁用账号（软删除）。禁止管理员禁用自己。"""
    if target_user_id == operator_user_id and not is_active:
        raise_business("不能禁用当前登录的管理员账号")
    member = (
        db.query(WorkspaceMember)
        .filter(
            WorkspaceMember.workspace_id == workspace_id,
            WorkspaceMember.user_id == target_user_id,
        )
        .first()
    )
    if not member:
        raise_not_found("该账号不在当前 workspace")
    user = db.query(User).filter(User.id == target_user_id).first()
    if not user:
        raise_not_found("账号不存在")
    user.is_active = is_active
    db.commit()
    logger.info("admin set user=%s active=%s", target_user_id, is_active)
    return {"id": user.id, "is_active": is_active}


def delete_workspace_user(
    db: Session, workspace_id: int, target_user_id: int, operator_user_id: int,
) -> dict:
    """物理删除账号：先清关联(login_record+workspace_member)再删 user。禁止删自己。"""
    if target_user_id == operator_user_id:
        raise_business("不能删除当前登录的管理员账号")
    member = (
        db.query(WorkspaceMember)
        .filter(
            WorkspaceMember.workspace_id == workspace_id,
            WorkspaceMember.user_id == target_user_id,
        )
        .first()
    )
    if not member:
        raise_not_found("该账号不在当前 workspace")
    user = db.query(User).filter(User.id == target_user_id).first()
    if not user:
        raise_not_found("账号不存在")
    username = user.username
    db.query(LoginRecord).filter(LoginRecord.user_id == target_user_id).delete()
    db.query(WorkspaceMember).filter(WorkspaceMember.user_id == target_user_id).delete()
    db.delete(user)
    db.commit()
    logger.info("admin DELETED user=%s(%s) from ws=%s", target_user_id, username, workspace_id)
    return {"id": target_user_id, "deleted": True}