from fastapi import APIRouter, Request, Depends, HTTPException, WebSocket, WebSocketDisconnect, Query
from typing import Optional, List
from services.global_manager import global_manager
from services.rate_limit_service import rate_limit_service
import auth_utils
import db
import schemas
import session_utils
import uuid
from datetime import datetime, timedelta
import locales
from dependencies import get_current_user, require_admin

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

@router.post("/register", response_model=schemas.UserResponse)
async def register(request: Request, user: schemas.UserCreate, lang: str = "en"):
    existing_user = db.execute_query("SELECT id FROM users WHERE email = %s", (user.email,))
    if existing_user:
        raise HTTPException(status_code=400, detail=locales.translate_error("email_already_registered", lang))
    
    ip_address = request.client.host if request.client else None
    hashed_password = auth_utils.get_password_hash(user.password)
    
    query = """
    INSERT INTO users (email, password_hash, first_name, last_name, phone, shipping_address, preferred_language, role, ip_address, is_company, company_name, company_pib, company_address)
    VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)
    """
    params = (user.email, hashed_password, user.first_name, user.last_name, user.phone, user.shipping_address, user.preferred_language, 'user', ip_address, user.is_company, user.company_name, user.company_pib, user.company_address)
    
    user_id = db.execute_commit(query, params)
    new_user = db.execute_query("SELECT id, email, first_name, last_name, phone, shipping_address, preferred_language, role, can_chat, is_active, is_company, company_name, company_pib, company_address, ip_address, created_at FROM users WHERE id = %s", (user_id,))
    return new_user[0]

@router.post("/login", response_model=schemas.Token)
async def login(request: Request, user_data: schemas.UserLogin, lang: str = "en"):
    ip = request.client.host if request.client else "unknown"
    email = user_data.email.lower()

    # 1. Check Global Rate Limit
    if rate_limit_service.is_rate_limited(email, ip):
        raise HTTPException(
            status_code=429, 
            detail=locales.translate_error("too_many_attempts", lang)
        )

    # 2. Check if Captcha is Required
    if rate_limit_service.is_captcha_required(email, ip):
        if not user_data.captcha_token:
            raise HTTPException(
                status_code=403, 
                detail=locales.translate_error("captcha_required", lang)
            )
        
        # 3. Verify Captcha
        if not await rate_limit_service.verify_captcha(user_data.captcha_token):
            raise HTTPException(
                status_code=403, 
                detail=locales.translate_error("invalid_token", lang)
            )

    # 4. Attempt Authentication
    user = db.execute_query("SELECT * FROM users WHERE email = %s", (email,))
    if not user or not auth_utils.verify_password(user_data.password, user[0]['password_hash']):
        # Log failure
        rate_limit_service.record_failed_attempt(email, ip)
        raise HTTPException(status_code=401, detail=locales.translate_error("incorrect_credentials", lang))
    
    if not user[0].get('is_active', True):
        raise HTTPException(status_code=403, detail="Your account has been suspended.")
    
    # 5. Success - Reset Rate Limits
    rate_limit_service.reset_attempts(email, ip)

    access_token = auth_utils.create_access_token(
        data={"sub": user[0]['email'], "id": user[0]['id'], "role": user[0]['role']}
    )
    return {"access_token": access_token, "token_type": "bearer"}

@router.post("/social-login", response_model=schemas.Token)
async def social_login(request: Request, data: schemas.SocialLogin):
    user = db.execute_query("SELECT id, email, role, is_active FROM users WHERE email = %s", (data.email,))
    if user:
        if not user[0].get('is_active', True):
            raise HTTPException(status_code=403, detail="Your account has been suspended.")
        access_token = auth_utils.create_access_token(
            data={"sub": user[0]['email'], "id": user[0]['id'], "role": user[0]['role']}
        )
        return {"access_token": access_token, "token_type": "bearer"}
    else:
        ip_address = request.client.host if request.client else None
        hashed_password = auth_utils.get_password_hash(str(uuid.uuid4()))
        query = "INSERT INTO users (email, password_hash, first_name, last_name, preferred_language, role, ip_address) VALUES (%s, %s, %s, %s, %s, %s, %s)"
        params = (data.email, hashed_password, data.first_name, data.last_name, data.preferred_language, 'user', ip_address)
        user_id = db.execute_commit(query, params)
        access_token = auth_utils.create_access_token(data={"sub": data.email, "id": user_id, "role": 'user'})
        return {"access_token": access_token, "token_type": "bearer"}

@router.post("/logout")
async def logout(user: dict = Depends(get_current_user)):
    sid = user.get("sid")
    if sid: session_utils.delete_session(sid)
    return {"message": "Successfully logged out"}

@router.post("/forgot-password")
async def forgot_password(request: schemas.ForgotPassword):
    user = db.execute_query("SELECT id FROM users WHERE email = %s", (request.email,))
    if not user: raise HTTPException(status_code=404, detail="Email not found")
    token = str(uuid.uuid4())
    expires_at = datetime.utcnow() + timedelta(minutes=15)
    db.execute_commit("INSERT INTO password_reset_tokens (user_id, token, expires_at) VALUES (%s, %s, %s)", (user[0]['id'], token, expires_at))
    return {"message": "Reset instructions sent to your email", "demo_token": token}

@router.post("/reset-password")
async def reset_password(request: schemas.ResetPassword):
    reset_data = db.execute_query("SELECT user_id, expires_at FROM password_reset_tokens WHERE token = %s", (request.token,))
    if not reset_data: raise HTTPException(status_code=400, detail="Invalid token")
    if reset_data[0]['expires_at'] < datetime.utcnow(): raise HTTPException(status_code=400, detail="Token expired")
    hashed_password = auth_utils.get_password_hash(request.new_password)
    db.execute_commit("UPDATE users SET password_hash = %s WHERE id = %s", (hashed_password, reset_data[0]['user_id']))
    db.execute_commit("DELETE FROM password_reset_tokens WHERE token = %s", (request.token,))
    return {"message": "Password reset successfully"}

@router.get("/me", response_model=schemas.UserResponse)
async def get_me(user: dict = Depends(get_current_user)):
    user_id = user.get("id")
    user_data = db.execute_query("SELECT id, email, first_name, last_name, phone, shipping_address, preferred_language, role, can_chat, is_active, is_company, company_name, company_pib, company_address, ip_address, created_at FROM users WHERE id = %s", (user_id,))
    if not user_data: raise HTTPException(status_code=404, detail="User not found")
    return user_data[0]

@router.put("/me", response_model=schemas.UserResponse)
async def update_me(data: schemas.UserUpdate, user: dict = Depends(get_current_user)):
    user_id = user.get("id")
    update_fields = []
    params = []
    for field, value in data.dict(exclude_unset=True).items():
        update_fields.append(f"{field} = %s")
        params.append(value)
    if update_fields:
        query = f"UPDATE users SET {', '.join(update_fields)} WHERE id = %s"
        params.append(user_id)
        db.execute_commit(query, tuple(params))
    user = db.execute_query("SELECT id, email, first_name, last_name, phone, shipping_address, preferred_language, role, can_chat, is_active, is_company, company_name, company_pib, company_address, ip_address, created_at FROM users WHERE id = %s", (user_id,))
    return user[0]

@router.get("/admin/users")
async def admin_get_users(page: int = 1, size: int = 50, search: Optional[str] = None, admin: dict = Depends(require_admin)):
    
    offset = (page - 1) * size
    base_query = "SELECT id, email, first_name, last_name, phone, shipping_address, preferred_language, role, can_chat, is_active, is_company, company_name, company_pib, company_address, ip_address, created_at FROM users"
    count_query = "SELECT COUNT(*) as total FROM users"
    params = []
    if search and search.strip():
        where_clause = " WHERE email LIKE %s OR first_name LIKE %s OR last_name LIKE %s OR phone LIKE %s"
        base_query += where_clause
        count_query += where_clause
        pattern = f"%{search.strip()}%"
        params = [pattern] * 4
        
    base_query += " ORDER BY id DESC LIMIT %s OFFSET %s"
    
    users = db.execute_query(base_query, tuple(params + [size, offset]))
    total = db.execute_query(count_query, tuple(params))[0]['total']
    
    return {"users": users, "total": total, "page": page, "size": size}

@router.post("/admin/users", response_model=schemas.UserResponse)
async def admin_create_user(data: schemas.UserCreate, admin: dict = Depends(require_admin)):
    
    existing_user = db.execute_query("SELECT id FROM users WHERE email = %s", (data.email,))
    if existing_user:
        raise HTTPException(status_code=400, detail="Email already registered")
        
    hashed_password = auth_utils.get_password_hash(data.password)
    user_id = db.execute_commit(
        "INSERT INTO users (email, password_hash, first_name, last_name, phone, role, can_chat) VALUES (%s, %s, %s, %s, %s, %s, %s)",
        (data.email, hashed_password, data.first_name, data.last_name, data.phone, 'user', True)
    )
    
    user = db.execute_query("SELECT id, email, first_name, last_name, phone, shipping_address, preferred_language, role, can_chat, is_active, is_company, company_name, company_pib, company_address, ip_address, created_at FROM users WHERE id = %s", (user_id,))
    return user[0]

@router.patch("/users/{target_id}/admin", response_model=schemas.UserResponse)
async def admin_update_user(target_id: int, data: schemas.AdminUserUpdate, admin: dict = Depends(require_admin)):
    
    update_fields = []
    params = []
    update_dict = data.dict(exclude_unset=True)
    
    # Handle password hashing
    if "password" in update_dict:
        password = update_dict.pop("password")
        update_dict["password_hash"] = auth_utils.get_password_hash(password)
    
    for field, value in update_dict.items():
        update_fields.append(f"`{field}` = %s")
        params.append(value)
    
    if update_fields:
        query = f"UPDATE users SET {', '.join(update_fields)} WHERE id = %s"
        params.append(target_id)
        db.execute_commit(query, tuple(params))
        
        # If user was deactivated, kick from active sessions
        if update_dict.get("is_active") is False:
            await global_manager.kick_user(target_id)
        
    user = db.execute_query("SELECT id, email, first_name, last_name, phone, shipping_address, preferred_language, role, can_chat, is_active, is_company, company_name, company_pib, company_address, ip_address, created_at FROM users WHERE id = %s", (target_id,))
    if not user: raise HTTPException(status_code=404, detail="User not found")
    return user[0]

# WebSocket implementation moved to main.py to handle path prefixing issues
# @router.websocket("/ws/global")
# async def ws_global(websocket: WebSocket, token: str = Query(...)):
#     ...