package cooler_test

import (
	"context"
	"encoding/json"
	"fmt"
	"time"

	"git.golem15.com/golem15/summercms/modules/backpack"
	"git.golem15.com/golem15/summercms/modules/cooler"
)

func ExampleFromApp() {
	// serve publishes the Cache at start-up; a job or console command asks
	// FromApp, which builds the configured driver (memory here) once.
	app := backpack.New(nil)
	cache, err := cooler.FromApp(app)
	if err != nil {
		fmt.Println(err)
		return
	}
	ctx := context.Background()
	loads := 0
	popular := func(context.Context) ([]byte, error) {
		loads++
		return json.Marshal([]string{"Hello", "Summer"})
	}
	var titles []string
	for range 2 {
		raw, err := cache.Remember(ctx, "blog:popular", 10*time.Minute, popular)
		if err != nil {
			fmt.Println(err)
			return
		}
		if err := json.Unmarshal(raw, &titles); err != nil {
			fmt.Println(err)
			return
		}
	}
	fmt.Println(titles, loads)
	// Output: [Hello Summer] 1
}