package dlcache_test

import (
	"crypto/sha1"
	"encoding/hex"
	"io"
	"os"
	"path/filepath"
	"testing"

	"go.arsenm.dev/lure/internal/dlcache"
)

func init() {
	dir, err := os.MkdirTemp("/tmp", "lure-dlcache-test.*")
	if err != nil {
		panic(err)
	}
	dlcache.BasePath = dir
}

func TestNew(t *testing.T) {
	const id = "https://example.com"
	dir, err := dlcache.New(id)
	if err != nil {
		t.Errorf("Expected no error, got %s", err)
	}

	exp := filepath.Join(dlcache.BasePath, sha1sum(id))
	if dir != exp {
		t.Errorf("Expected %s, got %s", exp, dir)
	}

	fi, err := os.Stat(dir)
	if err != nil {
		t.Errorf("stat: expected no error, got %s", err)
	}

	if !fi.IsDir() {
		t.Errorf("Expected cache item to be a directory")
	}

	dir2, ok := dlcache.Get(id)
	if !ok {
		t.Errorf("Expected Get() to return valid value")
	}
	if dir2 != dir {
		t.Errorf("Expected %s from Get(), got %s", dir, dir2)
	}
}

func sha1sum(id string) string {
	h := sha1.New()
	_, _ = io.WriteString(h, id)
	return hex.EncodeToString(h.Sum(nil))
}