package handler

import (
	"fmt"
	"net/http"
	"spend-sparrow/internal/handler/middleware"
	"spend-sparrow/internal/service"
	t "spend-sparrow/internal/template/dashboard"
	"spend-sparrow/internal/utils"
	"time"
)

type Dashboard interface {
	Handle(router *http.ServeMux)
}

type DashboardImpl struct {
	s service.Dashboard
	r *Render
}

func NewDashboard(s service.Dashboard, r *Render) Dashboard {
	return DashboardImpl{
		s: s,
		r: r,
	}
}

func (h DashboardImpl) Handle(r *http.ServeMux) {
	r.Handle("GET /transaction", h.handleDashboardPage())
}

func (h DashboardImpl) handleDashboardPage() http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		updateSpan(r)

		user := middleware.GetUser(r)
		if user == nil {
			utils.DoRedirect(w, r, "/auth/signin")
			return
		}

		var month time.Time
		var err error
		monthStr := r.URL.Query().Get("month")
		if monthStr == "" {
			month, err = time.Parse("2006-01-02", r.FormValue("timestamp"))
			if err != nil {
				handleError(w, r, fmt.Errorf("could not parse timestamp: %w", service.ErrBadRequest))
				return
			}
		} else {
			month = time.Now()
		}

		summary, err := h.s.Summary(r.Context(), user, month)

		comp := t.Dashboard(summary)
		if utils.IsHtmx(r) {
			h.r.Render(r, w, comp)
		} else {
			h.r.RenderLayout(r, w, comp, user)
		}
	}
}