from typing import List, Any
import logging
from fastapi import APIRouter, Depends, HTTPException, Body, BackgroundTasks, Request, Query
from sqlalchemy.orm import Session
from sqlalchemy import or_
from sqlalchemy.exc import IntegrityError

from app.api.v1 import deps
from app.core import security
from app.core.utils import generate_english_name, get_client_ip
from app.models.user import User, UserRole
from app.models.mapping import AppUserMapping
from app.schemas.user import User as UserSchema, UserCreate, UserUpdate, UserList, PromoteUserRequest, BatchResetEnglishNameRequest
from app.services.webhook_service import WebhookService
from app.services.captcha_service import CaptchaService
from app.services.log_service import LogService
from app.schemas.operation_log import ActionType

router = APIRouter()
logger = logging.getLogger(__name__)

@router.get("/search", response_model=List[UserSchema], summary="搜索用户")
def search_users(
    keyword: str = Query(None, alias="q"),
    limit: int = 20,
    db: Session = Depends(deps.get_db),
    current_user: User = Depends(deps.get_current_active_user),
):
    """
    搜索用户（支持姓名、手机号、英文名）。
    """
    query = db.query(User).filter(
        User.is_deleted == 0,
        User.status == "ACTIVE"
    )
    
    if keyword:
        query = query.filter(
            or_(
                User.mobile.ilike(f"%{keyword}%"),
                User.name.ilike(f"%{keyword}%"),
                User.english_name.ilike(f"%{keyword}%")
            )
        )
    
    # Exclude self
    query = query.filter(User.id != current_user.id)
        
    users = query.limit(limit).all()
    return users

@router.get("/", response_model=UserList, summary="获取用户列表")
def read_users(
    skip: int = 0,
    limit: int = 10,
    status: str = None,
    role: str = None,
    mobile: str = None,
    name: str = None,
    english_name: str = None,
    keyword: str = None,
    db: Session = Depends(deps.get_db),
    current_user: User = Depends(deps.get_current_active_user),
):
    """
    获取用户列表。只有超级管理员可以查看所有用户。
    支持通过 mobile, name, english_name 精确/模糊筛选，
    也支持通过 keyword 进行跨字段模糊搜索。
    """
    if current_user.role != "SUPER_ADMIN":
        raise HTTPException(status_code=403, detail="权限不足")

    # Filter out soft-deleted users
    query = db.query(User).filter(User.is_deleted == 0)
    
    if status:
        query = query.filter(User.status == status)
    if role:
        query = query.filter(User.role == role)
        
    # Specific field filters (AND logic)
    if mobile:
        query = query.filter(User.mobile.ilike(f"%{mobile}%"))
    if name:
        query = query.filter(User.name.ilike(f"%{name}%"))
    if english_name:
        query = query.filter(User.english_name.ilike(f"%{english_name}%"))
        
    # Keyword search (OR logic across fields) - intersects with previous filters
    if keyword:
        query = query.filter(
            or_(
                User.mobile.ilike(f"%{keyword}%"),
                User.name.ilike(f"%{keyword}%"),
                User.english_name.ilike(f"%{keyword}%")
            )
        )
        
    total = query.count()
    users = query.order_by(User.id.desc()).offset(skip).limit(limit).all()
    return {"total": total, "items": users}

@router.post("/", response_model=UserSchema, summary="创建用户")
def create_user(
    *,
    db: Session = Depends(deps.get_db),
    user_in: UserCreate,
    request: Request,
    background_tasks: BackgroundTasks,
    current_user: User = Depends(deps.get_current_active_user),
):
    """
    创建新用户。只有超级管理员可以直接创建用户。
    公开注册请使用 /open/register。
    """
    if current_user.role != "SUPER_ADMIN":
        raise HTTPException(status_code=403, detail="权限不足")

    # Verify Admin Password
    if not user_in.admin_password or not security.verify_password(user_in.admin_password, current_user.password_hash):
        logger.warning(f"管理员创建用户失败: 密码错误 (Admin: {current_user.mobile})")
        raise HTTPException(status_code=403, detail="管理员密码错误")

    user = db.query(User).filter(User.mobile == user_in.mobile).first()
    if user:
        raise HTTPException(
            status_code=400,
            detail="该手机号已在系统中注册",
        )
    
    if user_in.password:
        user_in.password = user_in.password.strip()

    # Remove spaces from name
    if user_in.name:
        user_in.name = user_in.name.replace(" ", "")

    # Generate default name if missing
    if not user_in.name:
        random_suffix = security.generate_alphanumeric_password(6)
        user_in.name = f"用户{random_suffix}"

    # Ensure unique name
    if user_in.name:
        original_name = user_in.name
        counter = 1
        while db.query(User).filter(User.name == user_in.name, User.is_deleted == 0).first():
            user_in.name = f"{original_name}{counter}"
            counter += 1

    english_name = user_in.english_name
    if not english_name and user_in.name:
        english_name = generate_english_name(user_in.name)

    # Ensure unique english_name
    if english_name:
        original_english_name = english_name
        counter = 1
        while db.query(User).filter(User.english_name == english_name, User.is_deleted == 0).first():
            english_name = f"{original_english_name}{counter}"
            counter += 1

    db_user = User(
        mobile=user_in.mobile,
        name=user_in.name,
        english_name=english_name,
        password_hash=security.get_password_hash(user_in.password),
        status="ACTIVE", # Admin created users are active by default
        role=user_in.role or UserRole.ORDINARY_USER
    )
    db.add(db_user)
    db.commit()
    db.refresh(db_user)
    
    # Log Operation
    LogService.create_log(
        db=db,
        operator_id=current_user.id,
        action_type=ActionType.MANUAL_ADD,
        target_user_id=db_user.id,
        target_mobile=db_user.mobile,
        ip_address=get_client_ip(request),
        details={"role": db_user.role}
    )
    
    logger.info(f"管理员创建用户成功: {db_user.mobile} (Role: {db_user.role})")

    return db_user

@router.post("/batch/reset-english-name", summary="批量重置用户英文名")
def batch_reset_english_name(
    *,
    db: Session = Depends(deps.get_db),
    req: BatchResetEnglishNameRequest,
    request: Request,
    current_user: User = Depends(deps.get_current_active_user),
):
    """
    批量重置选中用户的英文名。
    规则：根据姓名生成拼音，如有重复自动追加数字后缀。
    需要管理员密码验证。
    """
    if current_user.role != "SUPER_ADMIN":
        raise HTTPException(status_code=403, detail="权限不足")

    # Verify Admin Password
    if not security.verify_password(req.admin_password, current_user.password_hash):
        logger.warning(f"批量重置英文名失败: 密码错误 (Admin: {current_user.mobile})")
        raise HTTPException(status_code=403, detail="管理员密码错误")

    if not req.user_ids:
        raise HTTPException(status_code=400, detail="请选择用户")

    success_count = 0
    users = db.query(User).filter(User.id.in_(req.user_ids), User.is_deleted == 0).all()
    
    for user in users:
        if not user.name:
            continue
            
        old_english_name = user.english_name
        new_english_name = generate_english_name(user.name)
        
        # Uniqueness check
        if new_english_name:
            original_base = new_english_name
            counter = 1
            
            # Helper to check existence
            def check_exists(name, current_id):
                return db.query(User).filter(
                    User.english_name == name, 
                    User.is_deleted == 0, 
                    User.id != current_id
                ).first()

            while check_exists(new_english_name, user.id):
                new_english_name = f"{original_base}{counter}"
                counter += 1
        
        if old_english_name != new_english_name:
            user.english_name = new_english_name
            db.add(user)
            
            # Log
            LogService.create_log(
                db=db,
                operator_id=current_user.id,
                action_type=ActionType.UPDATE,
                target_user_id=user.id,
                target_mobile=user.mobile,
                ip_address=get_client_ip(request),
                details={
                    "field": "english_name", 
                    "old": old_english_name, 
                    "new": new_english_name,
                    "reason": "BATCH_RESET"
                }
            )
            success_count += 1
            
    db.commit()
    logger.info(f"批量重置英文名完成: 成功 {success_count} 个 (Admin: {current_user.mobile})")
    
    return {"success": True, "count": success_count}

@router.put("/{user_id}", response_model=UserSchema, summary="更新用户")
def update_user(
    *,
    db: Session = Depends(deps.get_db),
    user_id: int,
    user_in: UserUpdate,
    request: Request,
    background_tasks: BackgroundTasks,
    current_user: User = Depends(deps.get_current_active_user),
):
    """
    更新用户信息。超级管理员可以更新任何人，用户只能更新自己。
    """
    user = db.query(User).filter(User.id == user_id).first()
    if not user:
        raise HTTPException(status_code=404, detail="用户不存在")

    # Permission Check
    if current_user.role != "SUPER_ADMIN" and current_user.id != user_id:
        raise HTTPException(status_code=403, detail="权限不足")
    
    update_data = user_in.model_dump(exclude_unset=True)
    
    # Track actions for logging
    actions = []
    
    # Only Super Admin can change mobile
    if "mobile" in update_data:
        if current_user.role != "SUPER_ADMIN":
            del update_data["mobile"]
        else:
            # Require admin password for mobile change
            if not user_in.admin_password or not security.verify_password(user_in.admin_password, current_user.password_hash):
                logger.warning(f"修改用户手机号失败: 管理员密码错误 (Target: {user.mobile})")
                raise HTTPException(status_code=403, detail="管理员密码错误")

            # Check uniqueness
            existing_user = db.query(User).filter(User.mobile == update_data["mobile"]).first()
            if existing_user and existing_user.id != user_id:
                raise HTTPException(status_code=400, detail="该手机号已存在")
            
            if user.mobile != update_data["mobile"]:
                old_mobile = user.mobile
                new_mobile = update_data["mobile"]
                
                # Update Mappings first (logic: user mobile change should propagate to mappings)
                # Find mappings where mapped_key matches old_mobile
                mappings = db.query(AppUserMapping).filter(
                    AppUserMapping.user_id == user.id,
                    AppUserMapping.mapped_key == old_mobile
                ).all()
                
                for mapping in mappings:
                    mapping.mapped_key = new_mobile
                    db.add(mapping)
                
                try:
                    db.flush()
                except IntegrityError:
                    db.rollback()
                    logger.error(f"修改手机号失败: 映射冲突 ({old_mobile} -> {new_mobile})")
                    raise HTTPException(status_code=400, detail="修改失败：新手机号在某些应用中已存在映射关联")

                actions.append((ActionType.UPDATE, {"field": "mobile", "old": old_mobile, "new": new_mobile}))

    # Only Super Admin can change status or role
    if "status" in update_data:
        if current_user.role != "SUPER_ADMIN":
            del update_data["status"]
        elif update_data["status"] == "DISABLED" and user_id == current_user.id:
            raise HTTPException(status_code=400, detail="超级管理员不能禁用自己")
        else:
            # Require admin password for status change
            if not user_in.admin_password or not security.verify_password(user_in.admin_password, current_user.password_hash):
                logger.warning(f"修改用户状态失败: 密码错误")
                raise HTTPException(status_code=403, detail="管理员密码错误")
            
            # Add Log Action
            action_type = ActionType.DISABLE if update_data["status"] == "DISABLED" else ActionType.ENABLE
            actions.append((action_type, {"old": user.status, "new": update_data["status"]}))
            
    if "role" in update_data:
        if current_user.role != "SUPER_ADMIN":
            del update_data["role"]
        elif user_id == current_user.id and update_data["role"] != "SUPER_ADMIN":
             # Prevent demoting self
             raise HTTPException(status_code=400, detail="超级管理员不能降级自己")
        else:
             # Require admin password for role change
            if not user_in.admin_password or not security.verify_password(user_in.admin_password, current_user.password_hash):
                logger.warning(f"修改用户角色失败: 密码错误")
                raise HTTPException(status_code=403, detail="管理员密码错误")
            
            actions.append((ActionType.CHANGE_ROLE, {"old": user.role, "new": update_data["role"]}))

    if "admin_password" in update_data:
        del update_data["admin_password"]

    if "is_deleted" in update_data:
        if current_user.role != "SUPER_ADMIN":
             del update_data["is_deleted"]
        elif update_data["is_deleted"] == 1 and user_id == current_user.id:
             raise HTTPException(status_code=400, detail="超级管理员不能删除自己")
        elif update_data["is_deleted"] == 1:
            actions.append((ActionType.DELETE, {}))

    if "password" in update_data:
        password = update_data["password"]
        if password:
            password = password.strip()
        hashed_password = security.get_password_hash(password)
        del update_data["password"]
        user.password_hash = hashed_password
        
    # Auto-generate english_name if name changed and english_name not provided
    if "name" in update_data and update_data["name"]:
        update_data["name"] = update_data["name"].replace(" ", "")
        if "english_name" not in update_data or not update_data["english_name"]:
             update_data["english_name"] = generate_english_name(update_data["name"])

    for field, value in update_data.items():
        setattr(user, field, value)
        
    db.add(user)
    db.commit()
    db.refresh(user)
    
    # Trigger Webhook
    event_type = "UPDATE"
    if user.status == "DISABLED":
        event_type = "DISABLE"
    background_tasks.add_task(WebhookService.trigger_user_event, db, user.id, event_type)
    
    # Record Logs
    if current_user.role == "SUPER_ADMIN" and actions:
        for action_type, details in actions:
            LogService.create_log(
                db=db,
                operator_id=current_user.id,
                action_type=action_type,
                target_user_id=user.id,
                target_mobile=user.mobile,
                ip_address=get_client_ip(request),
                details=details
            )

    logger.info(f"更新用户信息成功: {user.mobile} (ID: {user.id})")
    return user

@router.post("/{user_id}/promote", response_model=UserSchema, summary="提升用户权限")
def promote_user(
    *,
    db: Session = Depends(deps.get_db),
    user_id: int,
    req: PromoteUserRequest,
    request: Request,
    current_user: User = Depends(deps.get_current_active_user),
):
    """
    将开发者提升为超级管理员。
    需要验证（管理员密码 + 验证码）。
    """
    if current_user.role != "SUPER_ADMIN":
        raise HTTPException(status_code=403, detail="权限不足")
    
    # 1. Verify Password
    if not security.verify_password(req.password, current_user.password_hash):
        logger.warning(f"提升权限失败: 密码错误 (Admin: {current_user.mobile})")
        raise HTTPException(status_code=403, detail="密码错误")
        
    # 2. Verify Captcha
    if not CaptchaService.verify_captcha(req.captcha_id, req.captcha_code):
        logger.warning(f"提升权限失败: 验证码错误")
        raise HTTPException(status_code=400, detail="验证码错误")
        
    user = db.query(User).filter(User.id == user_id).first()
    if not user:
        raise HTTPException(status_code=404, detail="用户不存在")
        
    old_role = user.role
    user.role = "SUPER_ADMIN"
    user.status = "ACTIVE" # Ensure they are active
    
    db.add(user)
    db.commit()
    db.refresh(user)
    
    # Log Operation
    LogService.create_log(
        db=db,
        operator_id=current_user.id,
        action_type=ActionType.CHANGE_ROLE,
        target_user_id=user.id,
        target_mobile=user.mobile,
        ip_address=get_client_ip(request),
        details={"old": old_role, "new": "SUPER_ADMIN"}
    )
    
    logger.info(f"提升用户为超管: {user.mobile}")
    return user

@router.delete("/{user_id}", response_model=UserSchema, summary="删除用户")
def delete_user(
    *,
    db: Session = Depends(deps.get_db),
    user_id: int,
    request: Request,
    current_user: User = Depends(deps.get_current_active_user),
    background_tasks: BackgroundTasks,
):
    """
    软删除用户。仅限超级管理员。
    """
    if current_user.role != "SUPER_ADMIN":
        raise HTTPException(status_code=403, detail="权限不足")
    
    if user_id == current_user.id:
        raise HTTPException(status_code=400, detail="超级管理员不能删除自己")
        
    user = db.query(User).filter(User.id == user_id).first()
    if not user:
        raise HTTPException(status_code=404, detail="用户不存在")
        
    user.is_deleted = 1 # Using Integer 1 for True
    user.status = "DISABLED" # Also disable login
    db.add(user)
    db.commit()
    
    background_tasks.add_task(WebhookService.trigger_user_event, db, user.id, "DELETE")
    
    # Log Operation
    LogService.create_log(
        db=db,
        operator_id=current_user.id,
        action_type=ActionType.DELETE,
        target_user_id=user.id,
        target_mobile=user.mobile,
        ip_address=get_client_ip(request),
        details={"status": "DISABLED"}
    )
    
    logger.info(f"删除用户成功: {user.mobile}")
    return user

@router.get("/me", response_model=UserSchema, summary="获取当前用户信息")
def read_user_me(
    current_user: User = Depends(deps.get_current_active_user),
):
    """
    获取当前登录用户的信息。
    """
    return current_user

@router.get("/{user_id}", response_model=UserSchema, summary="根据ID获取用户")
def read_user_by_id(
    user_id: int,
    current_user: User = Depends(deps.get_current_active_user),
    db: Session = Depends(deps.get_db),
):
    """
    根据用户ID获取特定用户信息。
    """
    user = db.query(User).filter(User.id == user_id).first()
    if not user:
         raise HTTPException(
            status_code=404,
            detail="该用户ID在系统中不存在",
        )
    return user