package router

import (
	"encoding/json"
	"net/http"
	"time"

	"go.jolheiser.com/gpm/config"

	"github.com/go-chi/chi"
	"github.com/go-chi/chi/middleware"
	"go.jolheiser.com/beaver"
)

var cache map[string]config.Package

func New(cfg *config.Config) *chi.Mux {
	r := chi.NewRouter()
	r.Use(middleware.RedirectSlashes)
	r.Use(middleware.Recoverer)
	r.Use(middleware.Timeout(30 * time.Second))

	r.Get("/", handleHome(cfg))
	r.Get("/export", handleExport(cfg))
	r.Get("/package/{name}", handlePackage)

	cache = cfg.Packages.Map()

	return r
}

func handleHome(cfg *config.Config) func(res http.ResponseWriter, _ *http.Request) {
	return func(res http.ResponseWriter, _ *http.Request) {
		status, err := json.Marshal(map[string]interface{}{
			"version":  config.Version,
			"packages": len(cfg.Packages),
		})
		if err != nil {
			res.WriteHeader(http.StatusInternalServerError)
			_, _ = res.Write([]byte("{}"))
			return
		}

		_, _ = res.Write(status)
	}
}

func handleExport(cfg *config.Config) func(res http.ResponseWriter, _ *http.Request) {
	return func(res http.ResponseWriter, _ *http.Request) {
		export, err := cfg.Export()
		if err != nil {
			beaver.Error(err)
			return
		}

		_, _ = res.Write([]byte(export))
	}
}

func handlePackage(res http.ResponseWriter, req *http.Request) {
	name := chi.URLParam(req, "name")

	if pkg, ok := cache[name]; ok {
		data, err := json.Marshal(pkg)
		if err != nil {
			res.WriteHeader(http.StatusInternalServerError)
			_, _ = res.Write([]byte("{}"))
			return
		}
		_, _ = res.Write(data)
		return
	}

	res.WriteHeader(http.StatusNotFound)
	_, _ = res.Write([]byte("{}"))
}