//go:build integration

package buildstep

import (
	"context"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"git.novox.be/novox/mesh-sdk/go/forgekey"
)

// Issue 890 C1 (AC3): a mirror brought to two commits in turn; a fetch through it checks out each commit, the
// alternates name the mirror, and no symlink is in the workspace.
func TestMirrorServesTwoCommitsWithoutSymlinks(t *testing.T) {
	root := t.TempDir()
	src := filepath.Join(root, "src.git")
	work := filepath.Join(root, "work")
	for _, d := range []string{src, work} {
		if err := os.MkdirAll(d, 0o755); err != nil {
			t.Fatal(err)
		}
	}
	gitIn(t, src, "init", "-q", "--bare")
	gitIn(t, work, "init", "-q")
	var commits []string
	for _, c := range []string{"one", "two"} {
		if err := os.WriteFile(filepath.Join(work, "f"), []byte(c), 0o644); err != nil {
			t.Fatal(err)
		}
		gitIn(t, work, "add", "f")
		gitIn(t, work, "commit", "-q", "-m", c)
		commits = append(commits, gitIn(t, work, "rev-parse", "HEAD"))
		gitIn(t, work, "push", "-q", src, "HEAD:refs/heads/main")
	}
	remote := "file://" + src
	mirror := filepath.Join(root, "mirror.git")
	for i, commit := range commits {
		if err := UpdateMirror(context.Background(), forgekey.ExecRunner, mirror, remote, commit, "", AllowFileRemote()); err != nil {
			t.Fatal(err)
		}
		ws := filepath.Join(root, "ws"+string(rune('0'+i)))
		if err := os.MkdirAll(ws, 0o755); err != nil {
			t.Fatal(err)
		}
		if err := FetchCommit(context.Background(), forgekey.ExecRunner, ws, remote, commit, "", AllowFileRemote(), WithMirror(mirror)); err != nil {
			t.Fatal(err)
		}
		if head := gitIn(t, ws, "rev-parse", "HEAD"); head != commit {
			t.Errorf("HEAD = %s, want %s", head, commit)
		}
		b, _ := os.ReadFile(filepath.Join(ws, ".git", "objects", "info", "alternates"))
		if !strings.Contains(string(b), filepath.Join(mirror, "objects")) {
			t.Errorf("alternates %q", b)
		}
		_ = filepath.Walk(ws, func(p string, fi os.FileInfo, err error) error {
			if err == nil && fi.Mode()&os.ModeSymlink != 0 {
				t.Errorf("symlink %s", p)
			}
			return nil
		})
	}
}