from collections import defaultdict
from typing import Optional
from fastapi import APIRouter, File, Path, Query, UploadFile
from sqlmodel import SQLModel, case, or_, select, delete as sqlmodel_delete
from apps.system.crud.user import check_account_exists, check_email_exists, check_email_format, check_pwd_format, get_db_user, single_delete, user_ws_options
from apps.system.crud.user_excel import batchUpload, downTemplate, download_error_file
from apps.system.models.system_model import UserWsModel, WorkspaceModel
from apps.system.models.user import UserModel
from apps.system.schemas.auth import CacheName, CacheNamespace
from apps.system.schemas.permission import SqlbotPermission, require_permissions
from apps.system.schemas.system_schema import PwdEditor, UserCreator, UserEditor, UserGrid, UserInfoDTO, UserLanguage, UserStatus, UserWs
from common.audit.models.log_model import OperationType, OperationModules
from common.audit.schemas.logger_decorator import LogConfig, system_log
from common.core.deps import CurrentUser, SessionDep, Trans
from common.core.pagination import Paginator
from common.core.schemas import PaginatedResponse, PaginationParams
from common.core.security import default_md5_pwd, md5pwd, verify_md5pwd
from common.core.sqlbot_cache import clear_cache
from common.core.config import settings
from apps.swagger.i18n import PLACEHOLDER_PREFIX
from sqlbot_xpack.config.arg_manage import get_group_args

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


@router.get("/template", include_in_schema=False)
@require_permissions(permission=SqlbotPermission(role=['admin']))
async def templateExcel(trans: Trans):
    return await downTemplate(trans)

@router.post("/batchImport", include_in_schema=False)
@require_permissions(permission=SqlbotPermission(role=['admin']))
async def upload_excel(session: SessionDep, trans: Trans, current_user: CurrentUser, file: UploadFile = File(...)):
    return await batchUpload(session, trans, file)


@router.get("/errorRecord/{file_id}", include_in_schema=False)
@require_permissions(permission=SqlbotPermission(role=['admin']))
async def download_error(file_id: str):
    return download_error_file(file_id)

@router.get("/info", summary=f"{PLACEHOLDER_PREFIX}system_user_current_user", description=f"{PLACEHOLDER_PREFIX}system_user_current_user_desc")
async def user_info(current_user: CurrentUser) -> UserInfoDTO:
    return current_user

 
@router.get("/defaultPwd", include_in_schema=False)
@require_permissions(permission=SqlbotPermission(role=['admin']))
async def default_pwd(session: SessionDep) -> str:
    login_args = await get_group_args(session=session, flag='login')
    hidden_arg = next((a for a in login_args if a.pkey == 'login.initial_pwd_hidden'), None)
    if hidden_arg and str(hidden_arg.pval).strip().lower() == 'true':
        return ''
    return settings.DEFAULT_PWD

@router.get("/pager/{pageNum}/{pageSize}", response_model=PaginatedResponse[UserGrid], summary=f"{PLACEHOLDER_PREFIX}system_user_grid", description=f"{PLACEHOLDER_PREFIX}system_user_grid")
@require_permissions(permission=SqlbotPermission(role=['admin']))
async def pager(
    session: SessionDep,
    pageNum: int = Path(..., title=f"{PLACEHOLDER_PREFIX}page_num", description=f"{PLACEHOLDER_PREFIX}page_num"),
    pageSize: int = Path(..., title=f"{PLACEHOLDER_PREFIX}page_size", description=f"{PLACEHOLDER_PREFIX}page_size"),
    keyword: Optional[str] = Query(None, description=f"{PLACEHOLDER_PREFIX}keyword"),
    status: Optional[int] = Query(None, description=f"{PLACEHOLDER_PREFIX}status"),
    origins: Optional[list[int]] = Query(None, description=f"{PLACEHOLDER_PREFIX}origin"),
    oidlist: Optional[list[int]] = Query(None, description=f"{PLACEHOLDER_PREFIX}oid"),
    order_by: Optional[str] = Query(None, description="排序字段"),
    desc: Optional[bool] = Query(False, description="是否降序"),
):
    pagination = PaginationParams(page=pageNum, size=pageSize)
    paginator = Paginator(session)

    # 允许排序的字段白名单（防止 SQL 注入）
    SORT_COLUMNS = {
        'account': UserModel.account,
        'create_time': UserModel.create_time,
        'name': UserModel.name,
        'email': UserModel.email,
        'status': UserModel.status,
    }
    sort_field = SORT_COLUMNS.get(order_by, UserModel.account)
    sort_clause = sort_field.desc() if desc else sort_field.asc()

    # SELECT 列必须包含 ORDER BY 列（PostgreSQL DISTINCT 约束）
    select_columns = [UserModel.id, UserModel.account]
    if order_by and order_by != 'account':
        select_columns.append(sort_field)

    # 相似度排序：综合考虑匹配字段数量和相似度分数
    # 当有 keyword 时，将 match_count 和 total_score 加入 SELECT 列以满足 DISTINCT 约束
    # 匹配字段越多越靠前；相同匹配字段数时，总分越低（相似度越高）越靠前
    match_count = None
    total_score = None
    if keyword:
        from sqlalchemy import func
        # 每个字段的相似度分数 (0=精确匹配, 1=前缀匹配, 2=包含匹配, 3=无匹配)
        account_score = case(
            (UserModel.account == keyword, 0),
            (UserModel.account.startswith(keyword), 1),
            (UserModel.account.contains(keyword), 2),
            else_=3
        )
        name_score = case(
            (UserModel.name == keyword, 0),
            (UserModel.name.startswith(keyword), 1),
            (UserModel.name.contains(keyword), 2),
            else_=3
        )
        email_score = case(
            (UserModel.email == keyword, 0),
            (UserModel.email.startswith(keyword), 1),
            (UserModel.email.contains(keyword), 2),
            else_=3
        )
        # 计算匹配字段数量（score < 3 表示有匹配）：匹配字段越多越靠前
        match_count = (
            case((account_score < 3, 1), else_=0) +
            case((name_score < 3, 1), else_=0) +
            case((email_score < 3, 1), else_=0)
        )
        # 总相似度分数：三个字段分数之和，越低越好
        total_score = account_score + name_score + email_score
        select_columns.append(match_count.label('match_count'))
        select_columns.append(total_score.label('total_score'))

    origin_stmt = (
        select(*select_columns)
        .join(UserWsModel, UserModel.id == UserWsModel.uid, isouter=True)
        .where(UserModel.id != 1)
        .distinct()
    )
    # 根据是否有 keyword 决定排序方式
    if keyword:
        # 按匹配字段数降序、总分升序、再按用户选择的排序字段
        origin_stmt = origin_stmt.order_by(match_count.desc(), total_score.asc(), sort_clause)
    else:
        origin_stmt = origin_stmt.order_by(sort_clause)

    if oidlist:
        origin_stmt = origin_stmt.where(UserWsModel.oid.in_(oidlist))
    if origins:
        origin_stmt = origin_stmt.where(UserModel.origin.in_(origins))
    if status is not None:
        origin_stmt = origin_stmt.where(UserModel.status == status)
    if keyword:
        # 转义 SQL LIKE 特殊字符（_ 匹配单个字符，% 匹配任意字符串）
        escaped_keyword = keyword.replace('\\', '\\\\').replace('_', '\\_').replace('%', '\\%')
        keyword_pattern = f"%{escaped_keyword}%"
        origin_stmt = origin_stmt.where(
            or_(
                UserModel.account.ilike(keyword_pattern, escape='\\'),
                UserModel.name.ilike(keyword_pattern, escape='\\'),
                UserModel.email.ilike(keyword_pattern, escape='\\')
            )
        )
        
    user_page = await paginator.get_paginated_response(
        stmt=origin_stmt,
        pagination=pagination)
    uid_list = [item.get('id') for item in user_page.items]
    if not uid_list:
        return user_page
    stmt = (
        select(UserModel, UserWsModel.oid.label('ws_oid'))
        .join(UserWsModel, UserModel.id == UserWsModel.uid, isouter=True)
        .where(UserModel.id.in_(uid_list))
    )
    # 第二次查询也需要应用相同的相似度排序
    if keyword:
        from sqlalchemy import func
        account_score = case(
            (UserModel.account == keyword, 0),
            (UserModel.account.startswith(keyword), 1),
            (UserModel.account.contains(keyword), 2),
            else_=3
        )
        name_score = case(
            (UserModel.name == keyword, 0),
            (UserModel.name.startswith(keyword), 1),
            (UserModel.name.contains(keyword), 2),
            else_=3
        )
        email_score = case(
            (UserModel.email == keyword, 0),
            (UserModel.email.startswith(keyword), 1),
            (UserModel.email.contains(keyword), 2),
            else_=3
        )
        # 计算匹配字段数量（score < 3 表示有匹配）：匹配字段越多越靠前
        match_count = (
            case((account_score < 3, 1), else_=0) +
            case((name_score < 3, 1), else_=0) +
            case((email_score < 3, 1), else_=0)
        )
        # 总相似度分数：三个字段分数之和，越低越好
        total_score = account_score + name_score + email_score
        # 排序：匹配字段数降序、总分升序、再按用户选择的排序字段
        stmt = stmt.order_by(match_count.desc(), total_score.asc(), sort_clause)
    else:
        stmt = stmt.order_by(sort_clause)
    user_workspaces = session.exec(stmt).all()
    merged = defaultdict(list)
    extra_attrs = {}

    for (user, ws_oid) in user_workspaces:
        item = {}
        item.update(user.model_dump())
        user_id = item['id']
        merged[user_id].append(ws_oid)
        if user_id not in extra_attrs:
            extra_attrs[user_id] = {k: v for k, v in item.items() if k != "ws_oid"}

    # 组合结果
    result = [
        {**extra_attrs[user_id], "oid_list": list(filter(None, oid_list))} 
        for user_id, oid_list in merged.items()
    ]
    user_page.items = result
    return user_page

def format_user_dict(row) -> dict:
    result_dict = {}
    for item, key in zip(row, row._fields):
        if isinstance(item, SQLModel):
            result_dict.update(item.model_dump())
        else:
            result_dict[key] = item
    
    return result_dict

@router.get("/ws", include_in_schema=False)
async def ws_options(session: SessionDep, current_user: CurrentUser, trans: Trans) -> list[UserWs]:
    return await user_ws_options(session, current_user.id, trans)

@router.put("/ws/{oid}", summary=f"{PLACEHOLDER_PREFIX}switch_oid_api", description=f"{PLACEHOLDER_PREFIX}switch_oid_api")
@clear_cache(namespace=CacheNamespace.AUTH_INFO, cacheName=CacheName.USER_INFO, keyExpression="current_user.id")
@system_log(LogConfig(
    operation_type=OperationType.UPDATE,
    module=OperationModules.USER,
    resource_id_expr="editor.id"
))
async def ws_change(session: SessionDep, current_user: CurrentUser, trans:Trans, oid: int = Path(description=f"{PLACEHOLDER_PREFIX}oid")):
    ws_list: list[UserWs] = await user_ws_options(session, current_user.id)
    if not any(x.id == oid for x in ws_list):
        db_ws = session.get(WorkspaceModel, oid)
        if db_ws:
            raise Exception(trans('i18n_user.ws_miss', ws = db_ws.name))
        raise Exception(trans('i18n_not_exist', msg = f"{trans('i18n_ws.title')}[{oid}]"))
    user_model: UserModel = get_db_user(session = session, user_id = current_user.id)
    user_model.oid = oid
    session.add(user_model)

@router.get("/{id}", response_model=UserEditor, summary=f"{PLACEHOLDER_PREFIX}user_detail_api", description=f"{PLACEHOLDER_PREFIX}user_detail_api")
@require_permissions(permission=SqlbotPermission(role=['admin']))
async def query(session: SessionDep, trans: Trans, id: int = Path(description=f"{PLACEHOLDER_PREFIX}uid")) -> UserEditor:
    db_user: UserModel = get_db_user(session = session, user_id = id)
    u_ws_options = await user_ws_options(session, id, trans)
    result = UserEditor.model_validate(db_user.model_dump())
    if u_ws_options:
        result.oid_list = [item.id for item in u_ws_options]
    return result


@router.post("", summary=f"{PLACEHOLDER_PREFIX}user_create_api", description=f"{PLACEHOLDER_PREFIX}user_create_api")
@require_permissions(permission=SqlbotPermission(role=['admin']))
@system_log(LogConfig(
    operation_type=OperationType.CREATE,
    module=OperationModules.USER,
    result_id_expr="id"
))
async def user_create(session: SessionDep, creator: UserCreator, trans: Trans):
    return await create(session=session, creator=creator, trans=trans)
    
async def create(session: SessionDep, creator: UserCreator, trans: Trans):
    if check_account_exists(session=session, account=creator.account):
        raise Exception(trans('i18n_exist', msg = f"{trans('i18n_user.account')} [{creator.account}]"))
    """ if check_email_exists(session=session, email=creator.email):
        raise Exception(trans('i18n_exist', msg = f"{trans('i18n_user.email')} [{creator.email}]")) """
    if not check_email_format(creator.email):
        raise Exception(trans('i18n_format_invalid', key = f"{trans('i18n_user.email')} [{creator.email}]"))
    #data = creator.model_dump(exclude_unset=True)
    data = creator.model_dump()
    user_model = UserModel.model_validate(data)
    #user_model.create_time = get_timestamp()
    user_model.language = "zh-CN"
    user_model.oid = 0
    if creator.oid_list:
        # need to validate oid_list
        db_model_list = [
            UserWsModel.model_validate({
                "oid": oid,
                "uid": user_model.id,
                "weight": 0
            })
            for oid in creator.oid_list
        ]
        session.add_all(db_model_list)
        user_model.oid = creator.oid_list[0]   
    session.add(user_model)
    return user_model

    
@router.put("", summary=f"{PLACEHOLDER_PREFIX}user_update_api", description=f"{PLACEHOLDER_PREFIX}user_update_api")
@require_permissions(permission=SqlbotPermission(role=['admin']))
@clear_cache(namespace=CacheNamespace.AUTH_INFO, cacheName=CacheName.USER_INFO, keyExpression="editor.id")
@system_log(LogConfig(
    operation_type=OperationType.UPDATE,
    module=OperationModules.USER,
    resource_id_expr="editor.id"
))
async def update(session: SessionDep, editor: UserEditor, trans: Trans):
    user_model: UserModel = get_db_user(session = session, user_id = editor.id)
    if not user_model:
        raise Exception(f"User with id [{editor.id}] not found!")
    if editor.account != user_model.account:
        raise Exception(f"account cannot be changed!")
    """ if editor.email != user_model.email and check_email_exists(session=session, email=editor.email):
        raise Exception(trans('i18n_exist', msg = f"{trans('i18n_user.email')} [{editor.email}]")) """
    if not check_email_format(editor.email):
        raise Exception(trans('i18n_format_invalid', key = f"{trans('i18n_user.email')} [{editor.email}]"))
    origin_oid: int = user_model.oid
    
    uws_list_stmt = select(UserWsModel).where(UserWsModel.uid == editor.id)
    uws_list = session.exec(uws_list_stmt).all()
    
    existing_oids = {uws.oid for uws in uws_list}
    new_oid_set = set(editor.oid_list) if editor.oid_list else set()
    oids_to_remove = existing_oids - new_oid_set
    oids_to_add = new_oid_set - existing_oids
    
    if oids_to_remove:
        del_stmt = sqlmodel_delete(UserWsModel).where(UserWsModel.uid == editor.id, UserWsModel.oid.in_(oids_to_remove))
        session.exec(del_stmt)
    
    data = editor.model_dump(exclude_unset=True)
    user_model.sqlmodel_update(data)
    
    user_model.oid = 0
    if editor.oid_list:
        user_model.oid = origin_oid if origin_oid in editor.oid_list else  editor.oid_list[0]
        if oids_to_add:
            db_uws_model_list = [
                UserWsModel.model_validate({
                    "oid": oid,
                    "uid": user_model.id,
                    "weight": 0
                })
                for oid in oids_to_add
            ]
            session.add_all(db_uws_model_list)
    session.add(user_model)

@router.delete("/{id}", summary=f"{PLACEHOLDER_PREFIX}user_del_api", description=f"{PLACEHOLDER_PREFIX}user_del_api")
@require_permissions(permission=SqlbotPermission(role=['admin']))
@system_log(LogConfig(
    operation_type=OperationType.DELETE,
    module=OperationModules.USER,
    resource_id_expr="id"
))
async def delete(session: SessionDep, id: int = Path(description=f"{PLACEHOLDER_PREFIX}uid")):
    await single_delete(session, id)

@router.delete("", summary=f"{PLACEHOLDER_PREFIX}user_batchdel_api", description=f"{PLACEHOLDER_PREFIX}user_batchdel_api")
@require_permissions(permission=SqlbotPermission(role=['admin']))
@system_log(LogConfig(operation_type=OperationType.DELETE,module=OperationModules.USER,resource_id_expr="id_list"))
async def batch_del(session: SessionDep, id_list: list[int]):
    for id in id_list:
        await single_delete(session, id)
    
@router.put("/language", summary=f"{PLACEHOLDER_PREFIX}language_change", description=f"{PLACEHOLDER_PREFIX}language_change")
@clear_cache(namespace=CacheNamespace.AUTH_INFO, cacheName=CacheName.USER_INFO, keyExpression="current_user.id")
async def langChange(session: SessionDep, current_user: CurrentUser, trans: Trans, language: UserLanguage):
    lang = language.language
    if lang not in ["zh-CN", "zh-TW", "en", "ko-KR", "th-TH"]:
        raise Exception(trans('i18n_user.language_not_support', key = lang))
    db_user: UserModel = get_db_user(session=session, user_id=current_user.id)
    db_user.language = lang
    session.add(db_user)

   
@router.patch("/pwd/{id}", summary=f"{PLACEHOLDER_PREFIX}reset_pwd", description=f"{PLACEHOLDER_PREFIX}reset_pwd")
@require_permissions(permission=SqlbotPermission(role=['admin'])) 
@clear_cache(namespace=CacheNamespace.AUTH_INFO, cacheName=CacheName.USER_INFO, keyExpression="id")
@system_log(LogConfig(operation_type=OperationType.RESET_PWD,module=OperationModules.USER,resource_id_expr="id"))
async def pwdReset(session: SessionDep, current_user: CurrentUser, trans: Trans, id: int = Path(description=f"{PLACEHOLDER_PREFIX}uid")):
    if not current_user.isAdmin:
        raise Exception(trans('i18n_permission.no_permission', url = " patch[/user/pwd/id],", msg = trans('i18n_permission.only_admin')))
    db_user: UserModel = get_db_user(session=session, user_id=id)
    db_user.password = default_md5_pwd()
    session.add(db_user)

@router.put("/pwd", summary=f"{PLACEHOLDER_PREFIX}update_pwd", description=f"{PLACEHOLDER_PREFIX}update_pwd")
@clear_cache(namespace=CacheNamespace.AUTH_INFO, cacheName=CacheName.USER_INFO, keyExpression="current_user.id")
@system_log(LogConfig(operation_type=OperationType.UPDATE_PWD,module=OperationModules.USER,result_id_expr="id"))
async def pwdUpdate(session: SessionDep, current_user: CurrentUser, trans: Trans, editor: PwdEditor):
    new_pwd = editor.new_pwd
    if not check_pwd_format(new_pwd):
        raise Exception(trans('i18n_format_invalid', key = trans('i18n_user.password')))
    db_user: UserModel = get_db_user(session=session, user_id=current_user.id)
    if not verify_md5pwd(editor.pwd, db_user.password):
        raise Exception(trans('i18n_error', key = trans('i18n_user.password')))
    db_user.password = md5pwd(new_pwd)
    session.add(db_user)
    return db_user

    
@router.patch("/status", summary=f"{PLACEHOLDER_PREFIX}update_status", description=f"{PLACEHOLDER_PREFIX}update_status")
@require_permissions(permission=SqlbotPermission(role=['admin']))
@clear_cache(namespace=CacheNamespace.AUTH_INFO, cacheName=CacheName.USER_INFO, keyExpression="statusDto.id")
@system_log(LogConfig(operation_type=OperationType.UPDATE_STATUS,module=OperationModules.USER, resource_id_expr="statusDto.id"))
async def statusChange(session: SessionDep, current_user: CurrentUser, trans: Trans, statusDto: UserStatus):
    if not current_user.isAdmin:
        raise Exception(trans('i18n_permission.no_permission', url = ", ", msg = trans('i18n_permission.only_admin')))
    status = statusDto.status
    if status not in [0, 1]:
        return {"message": "status not supported"}
    db_user: UserModel = get_db_user(session=session, user_id=statusDto.id)
    db_user.status = status
    session.add(db_user)