"""飞书多应用 open_id 管理 — 存储/查询各应用下用户的 open_id，union_id 跨应用关联"""
from __future__ import annotations

import logging
from typing import Optional, Tuple

from sqlalchemy.orm import Session

from app.core.config import settings

logger = logging.getLogger(__name__)


def get_app_id_for_agent(agent_id: str) -> str:
    """根据 agent_id 返回对应的飞书应用 app_id。默认返回主飞书应用（苹果）。"""
    if settings.LINGXI_AGENT_ID and agent_id == settings.LINGXI_AGENT_ID:
        return settings.LINGXI_APP_ID or ""
    if settings.ORANGE_AGENT_ID and agent_id == settings.ORANGE_AGENT_ID:
        return settings.ORANGE_APP_ID or ""
    if settings.SUYAO_AGENT_ID and agent_id == settings.SUYAO_AGENT_ID:
        return settings.SUYAO_APP_ID or ""
    if settings.TIANTIAN_AGENT_ID and agent_id == settings.TIANTIAN_AGENT_ID:
        return settings.TIANTIAN_APP_ID or ""
    return settings.FEISHU_APP_ID or ""


def save_open_id(
    db: Session,
    app_id: str,
    open_id: str,
    union_id: Optional[str] = None,
    user_id: Optional[str] = None,
) -> None:
    """保存或更新 (app_id, open_id) 记录。

    如果已有同 app+open_id 的记录，更新 union_id 和 user_id；
    否则新建记录。user_id 可以为空（首次捕获时可能未知）。
    """
    from app.models.user_feishu_open_id import UserFeishuOpenId

    try:
        existing = (
            db.query(UserFeishuOpenId)
            .filter(
                UserFeishuOpenId.app_id == app_id,
                UserFeishuOpenId.open_id == open_id,
            )
            .first()
        )
        if existing:
            changed = False
            if union_id and existing.union_id != union_id:
                existing.union_id = union_id
                changed = True
            if user_id and existing.user_id != user_id:
                existing.user_id = user_id
                changed = True
            if changed:
                db.commit()
        else:
            record = UserFeishuOpenId(
                user_id=user_id,
                app_id=app_id,
                open_id=open_id,
                union_id=union_id,
            )
            db.add(record)
            db.commit()
    except Exception as e:
        logger.warning("保存飞书 open_id 失败: %s", e)
        db.rollback()


def find_user_id_by_open_id(db: Session, app_id: str, open_id: str) -> Optional[str]:
    """通过 (app_id, open_id) 查找已关联的 user_id。"""
    from app.models.user_feishu_open_id import UserFeishuOpenId

    try:
        record = (
            db.query(UserFeishuOpenId)
            .filter(
                UserFeishuOpenId.app_id == app_id,
                UserFeishuOpenId.open_id == open_id,
            )
            .first()
        )
        return record.user_id if record else None
    except Exception as e:
        logger.warning("查询 user_id 失败: %s", e)
        return None


def find_user_id_by_union_id(db: Session, union_id: str) -> Optional[str]:
    """通过 union_id 查找已关联的 user_id（跨应用识别）。"""
    from app.models.user_feishu_open_id import UserFeishuOpenId

    try:
        record = (
            db.query(UserFeishuOpenId)
            .filter(
                UserFeishuOpenId.union_id == union_id,
                UserFeishuOpenId.user_id.isnot(None),
            )
            .first()
        )
        return record.user_id if record else None
    except Exception as e:
        logger.warning("通过 union_id 查询 user_id 失败: %s", e)
        return None


def get_open_id_for_app(db: Session, user_id: str, app_id: str) -> Optional[str]:
    """查询用户在某飞书应用下的 open_id。"""
    from app.models.user_feishu_open_id import UserFeishuOpenId

    try:
        record = (
            db.query(UserFeishuOpenId)
            .filter(
                UserFeishuOpenId.user_id == user_id,
                UserFeishuOpenId.app_id == app_id,
            )
            .first()
        )
        return record.open_id if record else None
    except Exception as e:
        logger.warning("查询飞书 open_id 失败: %s", e)
        return None


def link_open_id_to_user(
    db: Session,
    app_id: str,
    open_id: str,
    user_id: str,
    union_id: Optional[str] = None,
) -> None:
    """将 (app_id, open_id) 关联到平台用户。已有记录则更新，否则创建。"""
    save_open_id(db, app_id=app_id, open_id=open_id, union_id=union_id, user_id=user_id)


def resolve_user_and_save(
    db: Session,
    app_id: str,
    open_id: str,
    union_id: Optional[str] = None,
) -> Optional[str]:
    """WS 消息处理入口：自动解析用户身份并保存 open_id。

    查找策略（按优先级）：
    1. 已有 (app_id, open_id) 记录中的 user_id
    2. 通过 union_id 在 user_feishu_open_ids 中查找
    3. 通过 open_id 匹配 User.feishu_open_id（苹果旧数据兼容）
    4. 通过 union_id 匹配 User.feishu_union_id

    找到用户后自动 link，否则只保存 (app_id, open_id, union_id)。

    Returns:
        找到的 user_id，未找到返回 None
    """
    from app.models.user import User

    # 1. 已有记录
    existing_user_id = find_user_id_by_open_id(db, app_id, open_id)
    if existing_user_id:
        # 补充 union_id
        if union_id:
            save_open_id(db, app_id=app_id, open_id=open_id, union_id=union_id, user_id=existing_user_id)
        return existing_user_id

    # 2. 通过 union_id 查找
    if union_id:
        user_id_by_union = find_user_id_by_union_id(db, union_id)
        if user_id_by_union:
            link_open_id_to_user(db, app_id=app_id, open_id=open_id, user_id=user_id_by_union, union_id=union_id)
            return user_id_by_union

    # 3. 兼容旧 User.feishu_open_id（苹果的 open_id）
    user = db.query(User).filter(User.feishu_open_id == open_id).first()
    if user:
        link_open_id_to_user(db, app_id=app_id, open_id=open_id, user_id=user.id, union_id=union_id)
        return user.id

    # 4. 有 union_id 但前面都没匹配到：尝试通过飞书 API 查找苹果 open_id 的 union_id
    if union_id:
        from app.services.feishu_app_service import lookup_union_id_by_open_id

        users_with_apple = db.query(User).filter(User.feishu_open_id.isnot(None)).all()
        for u in users_with_apple:
            apple_union_id = lookup_union_id_by_open_id(u.feishu_open_id)
            if apple_union_id and apple_union_id == union_id:
                # 回填苹果记录的 union_id
                from app.models.user_feishu_open_id import UserFeishuOpenId
                apple_record = (
                    db.query(UserFeishuOpenId)
                    .filter(
                        UserFeishuOpenId.user_id == u.id,
                        UserFeishuOpenId.app_id == (settings.FEISHU_APP_ID or ""),
                    )
                    .first()
                )
                if apple_record:
                    apple_record.union_id = union_id
                    db.commit()
                # 关联当前记录
                link_open_id_to_user(db, app_id=app_id, open_id=open_id, user_id=u.id, union_id=union_id)
                return u.id

    # 5. 未找到，只保存记录（user_id 为空）
    save_open_id(db, app_id=app_id, open_id=open_id, union_id=union_id)
    return None