package gitx

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

// gitInitCommit creates a real git repo with one commit and returns its root.
// Skips when git is unavailable.
func gitInitCommit(t *testing.T) string {
	t.Helper()
	if _, err := exec.LookPath("git"); err != nil {
		t.Skip("git not available")
	}
	root := t.TempDir()
	for _, args := range [][]string{
		{"init", "-q"}, {"config", "user.email", "t@x"}, {"config", "user.name", "t"},
	} {
		c := exec.Command("git", args...)
		c.Dir = root
		if out, err := c.CombinedOutput(); err != nil {
			t.Fatalf("git %v: %v\n%s", args, err, out)
		}
	}
	if err := os.WriteFile(filepath.Join(root, "f.txt"), []byte("x"), 0o644); err != nil {
		t.Fatal(err)
	}
	for _, args := range [][]string{{"add", "-A"}, {"commit", "-qm", "seed"}} {
		c := exec.Command("git", args...)
		c.Dir = root
		if out, err := c.CombinedOutput(); err != nil {
			t.Fatalf("git %v: %v\n%s", args, err, out)
		}
	}
	return root
}

func TestIsDirty(t *testing.T) {
	root := gitInitCommit(t)
	dirty, err := IsDirty(root)
	if err != nil {
		t.Fatal(err)
	}
	if dirty {
		t.Error("freshly committed tree reported dirty")
	}
	if err := os.WriteFile(filepath.Join(root, "new.txt"), []byte("y"), 0o644); err != nil {
		t.Fatal(err)
	}
	dirty, err = IsDirty(root)
	if err != nil {
		t.Fatal(err)
	}
	if !dirty {
		t.Error("tree with an untracked file reported clean")
	}
}

func TestLastCommitTime(t *testing.T) {
	root := gitInitCommit(t)
	ts, ok, err := LastCommitTime(root)
	if err != nil {
		t.Fatal(err)
	}
	if !ok {
		t.Fatal("LastCommitTime ok=false on a repo with a commit")
	}
	if ts.IsZero() {
		t.Error("LastCommitTime returned a zero time")
	}
}

func TestLastCommitTime_NoCommits(t *testing.T) {
	if _, err := exec.LookPath("git"); err != nil {
		t.Skip("git not available")
	}
	root := t.TempDir()
	c := exec.Command("git", "init", "-q")
	c.Dir = root
	if out, err := c.CombinedOutput(); err != nil {
		t.Fatalf("git init: %v\n%s", err, out)
	}
	if _, ok, err := LastCommitTime(root); err != nil || ok {
		t.Errorf("LastCommitTime on an empty repo = (ok=%v, err=%v), want (false, nil)", ok, err)
	}
}