package main

import (
	"encoding/hex"
	"os"
	"path/filepath"
	"regexp"
	"testing"

	"lukechampine.com/blake3"
)

func TestComputeBLAKE3UsesB3sumCheckFileDigestFormat(t *testing.T) {
	t.Parallel()

	dir := t.TempDir()
	path := filepath.Join(dir, "archive.tar.gz")
	content := []byte("mpv-manager release archive")
	if err := os.WriteFile(path, content, 0o600); err != nil {
		t.Fatal(err)
	}

	got, err := computeBLAKE3(path)
	if err != nil {
		t.Fatalf("computeBLAKE3: %v", err)
	}
	wantSum := blake3.Sum256(content)
	want := hex.EncodeToString(wantSum[:])
	if got != want {
		t.Fatalf("computeBLAKE3 = %q, want %q", got, want)
	}
	if !regexp.MustCompile(`^[0-9a-f]{64}$`).MatchString(got) {
		t.Fatalf("digest %q is not compatible with b3sum check-file syntax", got)
	}
}

func TestComputeBLAKE3MissingFile(t *testing.T) {
	t.Parallel()
	if _, err := computeBLAKE3(filepath.Join(t.TempDir(), "missing.zip")); err == nil {
		t.Fatal("computeBLAKE3 should fail for a missing file")
	}
}