package web

import (
	"net/http"
	"net/url"
	"strconv"
	"strings"

	"maisym.com/hsa/internal/storage"
)

type manageView struct {
	Categories []storage.Lookup
	People     []storage.Lookup
	Error      string
}

func (s *Server) handleManage(w http.ResponseWriter, r *http.Request) {
	cats, people, err := s.lookups()
	if err != nil {
		s.serverError(w, "load lookups", err)
		return
	}
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	_ = managePage.ExecuteTemplate(w, "base", manageView{
		Categories: cats,
		People:     people,
		Error:      r.URL.Query().Get("error"),
	})
}

func (s *Server) handleAddCategory(w http.ResponseWriter, r *http.Request) {
	s.addLookup(w, r, s.store.AddCategory)
}

func (s *Server) handleAddPerson(w http.ResponseWriter, r *http.Request) {
	s.addLookup(w, r, s.store.AddPerson)
}

func (s *Server) handleRenameCategory(w http.ResponseWriter, r *http.Request) {
	s.renameLookup(w, r, s.store.RenameCategory)
}

func (s *Server) handleRenamePerson(w http.ResponseWriter, r *http.Request) {
	s.renameLookup(w, r, s.store.RenamePerson)
}

func (s *Server) addLookup(w http.ResponseWriter, r *http.Request, add func(string) (int64, error)) {
	label := strings.TrimSpace(r.FormValue("label"))
	if label == "" {
		redirectManage(w, r, "Label cannot be empty.")
		return
	}
	if _, err := add(label); err != nil {
		redirectManage(w, r, "Could not add — maybe that label already exists.")
		return
	}
	redirectManage(w, r, "")
}

func (s *Server) renameLookup(w http.ResponseWriter, r *http.Request, rename func(int64, string) error) {
	id, err := strconv.ParseInt(strings.TrimSpace(r.FormValue("id")), 10, 64)
	if err != nil {
		redirectManage(w, r, "Invalid id.")
		return
	}
	label := strings.TrimSpace(r.FormValue("label"))
	if label == "" {
		redirectManage(w, r, "Label cannot be empty.")
		return
	}
	if err := rename(id, label); err != nil {
		redirectManage(w, r, "Could not rename — maybe that label already exists.")
		return
	}
	redirectManage(w, r, "")
}

func redirectManage(w http.ResponseWriter, r *http.Request, errMsg string) {
	target := "/manage"
	if errMsg != "" {
		target += "?error=" + url.QueryEscape(errMsg)
	}
	http.Redirect(w, r, target, http.StatusSeeOther)
}