package handler

import (
	"net/http"

	"github.com/gin-gonic/gin"

	"github.com/user-management-system/internal/service"
)

// SMSHandler handles SMS requests
type SMSHandler struct {
	authService    *service.AuthService
	smsCodeService *service.SMSCodeService
}

// NewSMSHandler creates a new SMSHandler (stub, no SMS configured)
func NewSMSHandler() *SMSHandler {
	return &SMSHandler{}
}

// NewSMSHandlerWithService creates a SMSHandler backed by real AuthService + SMSCodeService
func NewSMSHandlerWithService(authService *service.AuthService, smsCodeService *service.SMSCodeService) *SMSHandler {
	return &SMSHandler{
		authService:    authService,
		smsCodeService: smsCodeService,
	}
}

// SendCode 发送短信验证码（用于注册/登录）
func (h *SMSHandler) SendCode(c *gin.Context) {
	if h.smsCodeService == nil {
		c.JSON(http.StatusServiceUnavailable, gin.H{"error": "SMS service not configured"})
		return
	}

	var req service.SendCodeRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	resp, err := h.smsCodeService.SendCode(c.Request.Context(), &req)
	if err != nil {
		handleError(c, err)
		return
	}

	c.JSON(http.StatusOK, resp)
}

// LoginByCode 短信验证码登录（带设备信息以支持设备信任链路）
func (h *SMSHandler) LoginByCode(c *gin.Context) {
	if h.authService == nil {
		c.JSON(http.StatusServiceUnavailable, gin.H{"error": "SMS login not configured"})
		return
	}

	var req struct {
		Phone         string `json:"phone" binding:"required"`
		Code          string `json:"code" binding:"required"`
		DeviceID      string `json:"device_id"`
		DeviceName    string `json:"device_name"`
		DeviceBrowser string `json:"device_browser"`
		DeviceOS      string `json:"device_os"`
	}

	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	clientIP := c.ClientIP()
	resp, err := h.authService.LoginByCode(c.Request.Context(), req.Phone, req.Code, clientIP)
	if err != nil {
		handleError(c, err)
		return
	}

	// 自动注册/更新设备记录（不阻塞主流程）
	// 注意：必须用独立的 background context，不能用 c.Request.Context()（gin 回收后会取消）
	if req.DeviceID != "" && resp != nil && resp.User != nil {
		loginReq := &service.LoginRequest{
			DeviceID:      req.DeviceID,
			DeviceName:    req.DeviceName,
			DeviceBrowser: req.DeviceBrowser,
			DeviceOS:      req.DeviceOS,
		}
		userID := resp.User.ID
		go func() {
			devCtx, cancel := newBackgroundCtx(5)
			defer cancel()
			h.authService.BestEffortRegisterDevicePublic(devCtx, userID, loginReq)
		}()
	}

	c.JSON(http.StatusOK, resp)
}