package omdb

import (
	"fmt"
	"io/ioutil"
	"net/http"
	"os"
)

const (
	base = "http://www.omdbapi.com/?apikey=%s&i=%s"
)

var cache map[string][]byte

func Get(imdbID string) ([]byte, error) {
	if cache == nil {
		cache = make(map[string][]byte)
	}
	if b, ok := cache[imdbID]; ok {
		return b, nil
	}

	url := fmt.Sprintf(base, apiKey(), imdbID)
	resp, err := http.Get(url)
	if err != nil {
		return nil, fmt.Errorf("error getting %q: %w", url, err)
	}
	defer resp.Body.Close()

	b, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return nil, fmt.Errorf("error reading body from %q: %w", url, err)
	}

	cache[imdbID] = b

	return b, nil
}

func apiKey() string {
	return os.Getenv("API_KEY")
}