package gitengine

import (
	"errors"
	"reflect"
	"testing"
)

type fakeRunner struct {
	output string
	err    error
	args   []string
}

func (f *fakeRunner) Run(_ string, args ...string) (string, error) {
	f.args = append([]string(nil), args...)
	return f.output, f.err
}

func TestStatusClean(t *testing.T) {
	runner := &fakeRunner{output: "\n"}
	result, err := Status(runner, "/repo")
	if err != nil {
		t.Fatalf("Status: %v", err)
	}
	if !result.Clean {
		t.Fatal("expected clean status")
	}
	if !reflect.DeepEqual(runner.args, []string{"status", "--porcelain"}) {
		t.Fatalf("args: %#v", runner.args)
	}
}

func TestChangedFiles(t *testing.T) {
	runner := &fakeRunner{output: "README.md\nservices/core/main.go\n\n"}
	files, err := ChangedFiles(runner, "/repo", "abc", "def")
	if err != nil {
		t.Fatalf("ChangedFiles: %v", err)
	}
	want := []string{"README.md", "services/core/main.go"}
	if !reflect.DeepEqual(files, want) {
		t.Fatalf("files: got %#v want %#v", files, want)
	}
}

func TestChangedFilesRequiresRevisions(t *testing.T) {
	_, err := ChangedFiles(&fakeRunner{}, "/repo", "", "def")
	if !errors.Is(err, ErrInvalidGitInput) {
		t.Fatalf("expected ErrInvalidGitInput, got %v", err)
	}
}