package v1

// NotificationSettingHandler handles notification setting API endpoints.
// Reference: Chatwoot NotificationSettingsController — show + update
//
// Routes:
//   GET    /api/v1/accounts/:account_id/notification_settings
//   PATCH  /api/v1/accounts/:account_id/notification_settings

import (
	"net/http"

	"github.com/gin-gonic/gin"
	"github.com/gochat/gochat/internal/model"
	"github.com/gochat/gochat/internal/service"
	"github.com/gochat/gochat/pkg/response"
)

// NotificationSettingHandler handles HTTP requests for notification settings.
type NotificationSettingHandler struct {
	svc *service.NotificationSettingService
}

// NewNotificationSettingHandler creates a new handler instance.
func NewNotificationSettingHandler(svc *service.NotificationSettingService) *NotificationSettingHandler {
	return &NotificationSettingHandler{svc: svc}
}

// NotificationSettingUpdateWrapper matches Chatwoot params.require(:notification_settings) —
// request body must be nested under "notification_settings" key.
type NotificationSettingUpdateWrapper struct {
	NotificationSettings service.UpdateNotificationSettingRequest `json:"notification_settings"`
}

// Show returns the notification setting for the current user in the account.
// GET /api/v1/accounts/:account_id/notification_settings
// Reference: Chatwoot show — @user.notification_settings.find_by(account_id: Current.account.id)
// Jbuilder: id, user_id, account_id, all_email_flags, selected_email_flags, all_push_flags, selected_push_flags
func (h *NotificationSettingHandler) Show(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}

	userID := getUserID(c)
	if userID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "user not authenticated")
		return
	}

	ns, svcErr := h.svc.Get(c.Request.Context(), accountID, userID)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.OK(c, gin.H{
		"notification_setting": serializeNotificationSetting(ns),
	})
}

// Update modifies notification settings for the current user in the account.
// PATCH /api/v1/accounts/:account_id/notification_settings
// Reference: Chatwoot update — params.require(:notification_settings).permit(selected_email_flags: [], selected_push_flags: [])
// Then update_flags → save → render show
func (h *NotificationSettingHandler) Update(c *gin.Context) {
	accountID := getAccountID(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}

	userID := getUserID(c)
	if userID == 0 {
		response.AbortWithStatusError(c, http.StatusUnauthorized, response.ErrUnauthorized, "user not authenticated")
		return
	}

	var wrapper NotificationSettingUpdateWrapper
	if err := c.ShouldBindJSON(&wrapper); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid request body")
		return
	}

	ns, svcErr := h.svc.Update(c.Request.Context(), accountID, userID, wrapper.NotificationSettings)
	if svcErr != nil {
		handleServiceError(c, svcErr)
		return
	}

	response.OK(c, gin.H{
		"notification_setting": serializeNotificationSetting(ns),
	})
}

// serializeNotificationSetting builds the response object matching Chatwoot Jbuilder show.json.jbuilder:
// id, user_id, account_id, all_email_flags, selected_email_flags, all_push_flags, selected_push_flags
func serializeNotificationSetting(ns *model.NotificationSetting) gin.H {
	return gin.H{
		"id":                  ns.ID,
		"user_id":             ns.UserID,
		"account_id":          ns.AccountID,
		"all_email_flags":     model.AllEmailFlagNames(),
		"selected_email_flags": ns.SelectedEmailFlagNames(),
		"all_push_flags":      model.AllPushFlagNames(),
		"selected_push_flags": ns.SelectedPushFlagNames(),
	}
}