package releasecheck

import (
	"bytes"
	"os"
	"os/exec"
	"path/filepath"
	"runtime"
	"sort"
	"strings"
	"testing"
)

func TestAssetBuilderRejectsUnsafeDestinations(t *testing.T) {
	repoRoot := releaseCheckRepoRoot(t)
	builder := filepath.Join(repoRoot, "scripts", "build-release-assets.sh")
	nonempty := t.TempDir()
	if err := os.WriteFile(filepath.Join(nonempty, "existing"), []byte("x"), 0o644); err != nil {
		t.Fatal(err)
	}
	notDirectory := filepath.Join(t.TempDir(), "not-a-directory")
	if err := os.WriteFile(notDirectory, []byte("x"), 0o644); err != nil {
		t.Fatal(err)
	}
	linkTarget := t.TempDir()
	symlink := filepath.Join(t.TempDir(), "linked-output")
	if err := os.Symlink(linkTarget, symlink); err != nil {
		t.Fatal(err)
	}

	for _, args := range [][]string{
		nil,
		{"v1.2", t.TempDir()},
		{"1.2.3", t.TempDir()},
		{"v01.2.3", t.TempDir()},
		{"v1.02.3", t.TempDir()},
		{"v1.2.03", t.TempDir()},
		{"v1.2.3-rc.1", t.TempDir()},
		{"v1.2.3+build", t.TempDir()},
		{"v1.2.3", "relative-output"},
		{"v1.2.3", "/"},
		{"v1.2.3", repoRoot},
		{"v1.2.3", nonempty},
		{"v1.2.3", notDirectory},
		{"v1.2.3", symlink},
	} {
		command := exec.Command("sh", append([]string{builder}, args...)...)
		command.Dir = t.TempDir()
		output, err := command.CombinedOutput()
		if err == nil {
			t.Fatalf("asset builder %q succeeded", args)
		}
		if !strings.Contains(string(output), "build-release-assets:") {
			t.Fatalf("asset builder %q output = %q", args, output)
		}
	}
}

func TestAssetBuilderBuildsNamedAssetsAndChecksEmbeddedVersion(t *testing.T) {
	repoRoot := releaseCheckRepoRoot(t)
	builder := filepath.Join(repoRoot, "scripts", "build-release-assets.sh")
	binDir := t.TempDir()
	writeFakeGo(t, filepath.Join(binDir, "go"))
	outputDir := filepath.Join(t.TempDir(), "assets")

	command := exec.Command("sh", builder, "v1.2.3", outputDir)
	command.Dir = t.TempDir()
	command.Env = append(os.Environ(), "PATH="+binDir+string(os.PathListSeparator)+os.Getenv("PATH"))
	output, err := command.CombinedOutput()
	if err != nil {
		t.Fatalf("asset builder error = %v\n%s", err, output)
	}
	entries, err := os.ReadDir(outputDir)
	if err != nil {
		t.Fatal(err)
	}
	got := make([]string, 0, len(entries))
	for _, entry := range entries {
		got = append(got, entry.Name())
	}
	sort.Strings(got)
	want := []string{
		"narratio-v1.2.3-darwin-amd64",
		"narratio-v1.2.3-darwin-arm64",
		"narratio-v1.2.3-linux-amd64",
		"narratio-v1.2.3-linux-arm64",
		"narratio-v1.2.3-windows-amd64.exe",
		"narratio-v1.2.3-windows-arm64.exe",
	}
	if !slicesEqual(got, want) {
		t.Fatalf("asset names = %#v, want %#v", got, want)
	}
	version := exec.Command(filepath.Join(outputDir, "narratio-v1.2.3-linux-amd64"), "version")
	var versionOutput bytes.Buffer
	version.Stdout = &versionOutput
	if err := version.Run(); err != nil {
		t.Fatal(err)
	}
	if got := versionOutput.String(); got != "narratio v1.2.3\n" {
		t.Fatalf("embedded version output = %q", got)
	}
}

func releaseCheckRepoRoot(t *testing.T) string {
	t.Helper()
	_, file, _, ok := runtime.Caller(0)
	if !ok {
		t.Fatal("runtime.Caller() failed")
	}
	return filepath.Clean(filepath.Join(filepath.Dir(file), "..", ".."))
}

func writeFakeGo(t *testing.T, path string) {
	t.Helper()
	const fake = `#!/bin/sh
set -eu

if [ "$1" = env ]; then
  case $2 in
    GOOS) printf '%s\n' linux ;;
    GOARCH) printf '%s\n' amd64 ;;
    *) exit 1 ;;
  esac
  exit 0
fi

output=
version=
while [ "$#" -gt 0 ]; do
  case $1 in
    -o)
      shift
      output=$1
      ;;
    -ldflags)
      shift
      case $1 in
        *gitea.maximumdirect.net/eric/narratio/internal/buildinfo.Version=*)
          version=${1##*=}
          ;;
      esac
      ;;
  esac
  shift
done

[ -n "$output" ]
[ -n "$version" ]
printf '#!/bin/sh\nprintf "narratio %%s\\n" "%s"\n' "$version" > "$output"
chmod +x "$output"
`
	if err := os.WriteFile(path, []byte(fake), 0o755); err != nil {
		t.Fatal(err)
	}
}

func slicesEqual(left, right []string) bool {
	if len(left) != len(right) {
		return false
	}
	for index := range left {
		if left[index] != right[index] {
			return false
		}
	}
	return true
}