package server

import (
	"os"
	"os/exec"
	"path/filepath"
	"testing"

	"custard/internal/config"
	"custard/internal/gitread"
)

func gitRun(t *testing.T, dir string, args ...string) {
	t.Helper()
	c := exec.Command("git", args...)
	c.Dir = dir
	c.Env = append(c.Environ(),
		"GIT_AUTHOR_NAME=t", "GIT_AUTHOR_EMAIL=t@x", "GIT_AUTHOR_DATE=2026-01-01T00:00:00",
		"GIT_COMMITTER_NAME=t", "GIT_COMMITTER_EMAIL=t@x", "GIT_COMMITTER_DATE=2026-01-01T00:00:00")
	if out, err := c.CombinedOutput(); err != nil {
		t.Fatalf("git %v: %v: %s", args, err, out)
	}
}

// bookmarkRepo builds a bare "proj.git" in bookmark mode with one release branch.
func bookmarkRepo(t *testing.T) *Server {
	t.Helper()
	root := t.TempDir()
	work := filepath.Join(root, "work")
	gitRun(t, root, "init", "-q", "-b", "main", "work")
	if err := os.WriteFile(filepath.Join(work, ".custard.yaml"),
		[]byte("brew:\n  enabled: true\n  source: bookmark\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	gitRun(t, work, "add", ".")
	gitRun(t, work, "commit", "-q", "-m", "init")
	gitRun(t, work, "checkout", "-q", "-b", "release/v1.2.3")
	gitRun(t, work, "commit", "-q", "--allow-empty", "-m", "ship v1.2.3")
	gitRun(t, work, "checkout", "-q", "main")
	gitRun(t, work, "clone", "-q", "--bare", work, filepath.Join(root, "proj.git"))
	return &Server{store: gitread.New(root), cfg: config.Config{ReposPath: root}}
}

func TestLatestReleaseBookmarkMode(t *testing.T) {
	s := bookmarkRepo(t)
	ref, ok := s.latestRelease("proj")
	if !ok || ref.Name != "v1.2.3" {
		t.Fatalf("latestRelease = %q,%v; want v1.2.3,true", ref.Name, ok)
	}
	if ref.Message != "ship v1.2.3" {
		t.Errorf("label = %q, want tip subject", ref.Message)
	}
}

// tagRepo builds a bare "proj.git" in tag mode (no .custard.yaml) with a
// lightweight semver tag v1.0.0 on a commit.
func tagRepo(t *testing.T) *Server {
	t.Helper()
	root := t.TempDir()
	work := filepath.Join(root, "work")
	gitRun(t, root, "init", "-q", "-b", "main", "work")
	if err := os.WriteFile(filepath.Join(work, "README.md"),
		[]byte("hello\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	gitRun(t, work, "add", ".")
	gitRun(t, work, "commit", "-q", "-m", "init")
	gitRun(t, work, "tag", "v1.0.0")
	gitRun(t, work, "clone", "-q", "--bare", work, filepath.Join(root, "proj.git"))
	return &Server{store: gitread.New(root), cfg: config.Config{ReposPath: root}}
}

func TestLatestReleaseTagMode(t *testing.T) {
	s := tagRepo(t)
	ref, ok := s.latestRelease("proj")
	if !ok || ref.Name != "v1.0.0" {
		t.Fatalf("latestRelease = %q,%v; want v1.0.0,true", ref.Name, ok)
	}
}