package handlers

import (
	"net/http"

	"github.com/calendarapi/internal/middleware"
	"github.com/calendarapi/internal/models"
	"github.com/calendarapi/internal/service"
	"github.com/calendarapi/internal/utils"
	"github.com/go-chi/chi/v5"
)

type TaskReminderHandler struct {
	reminderSvc *service.TaskReminderService
}

func NewTaskReminderHandler(reminderSvc *service.TaskReminderService) *TaskReminderHandler {
	return &TaskReminderHandler{reminderSvc: reminderSvc}
}

func (h *TaskReminderHandler) List(w http.ResponseWriter, r *http.Request) {
	userID, _ := middleware.GetUserID(r.Context())
	taskID, err := utils.ValidateUUID(chi.URLParam(r, "id"))
	if err != nil {
		utils.WriteError(w, err)
		return
	}

	reminders, err := h.reminderSvc.List(r.Context(), userID, taskID)
	if err != nil {
		utils.WriteError(w, err)
		return
	}

	utils.WriteList(w, reminders, models.PageInfo{Limit: len(reminders)})
}

func (h *TaskReminderHandler) Add(w http.ResponseWriter, r *http.Request) {
	userID, _ := middleware.GetUserID(r.Context())
	taskID, err := utils.ValidateUUID(chi.URLParam(r, "id"))
	if err != nil {
		utils.WriteError(w, err)
		return
	}

	var req struct {
		Type        string                 `json:"type"`
		Config      map[string]interface{} `json:"config"`
		ScheduledAt string                 `json:"scheduled_at"`
	}
	if err := utils.DecodeJSON(r, &req); err != nil {
		utils.WriteError(w, err)
		return
	}

	t, err := utils.ParseTime(req.ScheduledAt)
	if err != nil {
		utils.WriteError(w, models.NewValidationError("invalid scheduled_at"))
		return
	}

	reminder, err := h.reminderSvc.Create(r.Context(), userID, taskID, service.CreateTaskReminderRequest{
		Type:        req.Type,
		Config:      req.Config,
		ScheduledAt: t,
	})
	if err != nil {
		utils.WriteError(w, err)
		return
	}

	utils.WriteJSON(w, http.StatusOK, map[string]interface{}{"reminder": reminder})
}

func (h *TaskReminderHandler) Delete(w http.ResponseWriter, r *http.Request) {
	userID, _ := middleware.GetUserID(r.Context())
	taskID, err := utils.ValidateUUID(chi.URLParam(r, "id"))
	if err != nil {
		utils.WriteError(w, err)
		return
	}
	reminderID, err := utils.ValidateUUID(chi.URLParam(r, "reminderId"))
	if err != nil {
		utils.WriteError(w, err)
		return
	}

	if err := h.reminderSvc.Delete(r.Context(), userID, taskID, reminderID); err != nil {
		utils.WriteError(w, err)
		return
	}

	utils.WriteOK(w)
}