package handlers

import (
	"encoding/json"
	"net/http"

	"boc/sms"
)

// SMSHandler hanterar SMS- och 2FA-endpoints
type SMSHandler struct {
	TwoFactor *sms.TwoFactorAuth
	Notifier  *sms.NotificationService
}

// NewSMSHandler skapar ny SMS-handler
func NewSMSHandler(twoFactor *sms.TwoFactorAuth, notifier *sms.NotificationService) *SMSHandler {
	return &SMSHandler{
		TwoFactor: twoFactor,
		Notifier:  notifier,
	}
}

// SendVerificationCode skickar 2FA-kod
func (h *SMSHandler) SendVerificationCode(w http.ResponseWriter, r *http.Request) {
	if h.TwoFactor == nil {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusServiceUnavailable)
		json.NewEncoder(w).Encode(map[string]interface{}{
			"error":   "SMS not configured",
			"message": "Set ELK46_USERNAME and ELK46_PASSWORD environment variables",
		})
		return
	}

	var req struct {
		Phone string `json:"phone"`
	}
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		http.Error(w, `{"error":"invalid request"}`, http.StatusBadRequest)
		return
	}

	code, err := h.TwoFactor.SendVerificationCode(req.Phone)
	if err != nil {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusInternalServerError)
		json.NewEncoder(w).Encode(map[string]interface{}{
			"error": err.Error(),
		})
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]interface{}{
		"message": "Verification code sent",
		"phone":   req.Phone,
		// I produktion: skicka INTE koden tillbaka!
		"code":    code, // Endast för test
	})
}

// VerifyCode verifierar 2FA-kod
func (h *SMSHandler) VerifyCode(w http.ResponseWriter, r *http.Request) {
	if h.TwoFactor == nil {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusServiceUnavailable)
		json.NewEncoder(w).Encode(map[string]interface{}{
			"error":   "SMS not configured",
			"message": "Set ELK46_USERNAME and ELK46_PASSWORD environment variables",
		})
		return
	}

	var req struct {
		Phone string `json:"phone"`
		Code  string `json:"code"`
	}
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		http.Error(w, `{"error":"invalid request"}`, http.StatusBadRequest)
		return
	}

	valid, err := h.TwoFactor.VerifyCode(req.Phone, req.Code)
	if err != nil {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusInternalServerError)
		json.NewEncoder(w).Encode(map[string]interface{}{
			"error": err.Error(),
		})
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]interface{}{
		"valid": valid,
	})
}

// SendNotification skickar generisk notifikation
func (h *SMSHandler) SendNotification(w http.ResponseWriter, r *http.Request) {
	var req struct {
		Phone   string `json:"phone"`
		Type    string `json:"type"`    // task_reminder, onboarding, document, performance, training, security
		Message string `json:"message"`
	}
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		http.Error(w, `{"error":"invalid request"}`, http.StatusBadRequest)
		return
	}

	var err error
	switch req.Type {
	case "task_reminder":
		err = h.Notifier.SendTaskReminder(req.Phone, req.Message, "idag")
	case "onboarding":
		err = h.Notifier.SendOnboardingWelcome(req.Phone, req.Message)
	case "document":
		err = h.Notifier.SendDocumentSignatureRequest(req.Phone, req.Message)
	case "security":
		err = h.Notifier.SendSecurityAlert(req.Phone, req.Message)
	default:
		http.Error(w, `{"error":"unknown notification type"}`, http.StatusBadRequest)
		return
	}

	if err != nil {
		http.Error(w, `{"error":"`+err.Error()+`"}`, http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]interface{}{
		"message": "Notification sent",
	})
}

// SMSStatus kontrollerar SMS-konfiguration
func (h *SMSHandler) SMSStatus(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]interface{}{
		"configured": h.TwoFactor != nil,
		"provider":   "46elks",
		"features": []string{
			"two_way_sms",
			"bulk_sms",
			"2fa_verification",
			"notifications",
		},
	})
}