package handlers

import (
	"net/http"
	"time"

	"github.com/gin-gonic/gin"
)

// RunNotificationsNow triggers the scanner on demand (UI-test + backfill).
// Optional ?date=YYYY-MM-DD lets the teacher replay a past day's send.
// Idempotent — already-logged combos are skipped.
func (h *Handler) RunNotificationsNow(c *gin.Context) {
	uid := getUserID(c)
	if uid == "" {
		respondError(c, http.StatusUnauthorized, "User not authenticated")
		return
	}
	runDate := time.Now()
	if param := c.Query("date"); param != "" {
		d, err := time.Parse("2006-01-02", param)
		if err != nil {
			respondError(c, http.StatusBadRequest, "date must be YYYY-MM-DD")
			return
		}
		runDate = d
	}
	res, err := h.notificationService.RunForDate(c.Request.Context(), runDate)
	if err != nil {
		respondError(c, http.StatusInternalServerError, "Run failed: "+err.Error())
		return
	}
	respondSuccess(c, res)
}

// ListEventNotifications returns the notification_log rows for one event so
// the DayDetail UI can show "Erinnerung verschickt am …".
func (h *Handler) ListEventNotifications(c *gin.Context) {
	uid := getUserID(c)
	if uid == "" {
		respondError(c, http.StatusUnauthorized, "User not authenticated")
		return
	}
	rows, err := h.notificationService.ListLog(c.Request.Context(), c.Param("id"), uid)
	if err != nil {
		respondError(c, http.StatusInternalServerError, err.Error())
		return
	}
	respondSuccess(c, rows)
}