package server

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

	"github.com/cdnutter/canon/internal/store"
)

// adminPage carries a JSON blob the page script boots from.
type adminPage struct {
	Boot template.JS
	List *store.List
}

func bootJSON(v any) template.JS {
	b, _ := json.Marshal(v)
	return template.JS(b)
}

type sizeLimits struct {
	Max         int `json:"max"`
	Recommended int `json:"recommended"`
	Warn        int `json:"warn"`
}

var limits = sizeLimits{store.MaxListSize, store.RecommendedListSize, store.SoftListSizeWarning}

func (s *Server) handleAdminLists(w http.ResponseWriter, r *http.Request) {
	lists, err := s.store.Lists(r.Context(), true)
	if err != nil {
		s.serverError(w, r, err)
		return
	}
	if lists == nil {
		lists = []store.List{}
	}
	covers, err := s.store.ListCovers(r.Context(), 3)
	if err != nil {
		s.serverError(w, r, err)
		return
	}
	s.render(w, r, http.StatusOK, "admin_lists", "Your lists", adminPage{Boot: bootJSON(map[string]any{
		"lists":      lists,
		"covers":     covers,
		"styles":     store.ListStyles,
		"categories": store.Categories,
		"limits":     limits,
	})})
}

func (s *Server) handleAdminList(w http.ResponseWriter, r *http.Request) {
	id, err := pathID(r)
	if err != nil {
		s.notFound(w, r)
		return
	}
	l, err := s.store.ListByID(r.Context(), id)
	if err != nil {
		s.notFound(w, r)
		return
	}
	cat := listCategory(l)
	provider := ""
	if p, err := s.providers.For(r.Context(), l.Category); err == nil {
		provider = p.Label()
	}
	s.render(w, r, http.StatusOK, "admin_list", l.Title, adminPage{List: &l, Boot: bootJSON(map[string]any{
		"list":        l,
		"category":    cat,
		"categories":  store.Categories,
		"limits":      limits,
		"provider":    provider,
		"productions": store.TheaterProductions,
		"styles":      store.ListStyles,
		"pageSize":    listPageSize,
	})})
}

func (s *Server) handleAdminSettings(w http.ResponseWriter, r *http.Request) {
	s.render(w, r, http.StatusOK, "admin_settings", "Settings", adminPage{Boot: bootJSON(map[string]any{
		"categories": store.Categories,
	})})
}