package application

import (
	"context"
	"errors"
	"strings"
	"testing"

	"github.com/mmmy/snapgo/internal/domain"
)

type fakeFTPUploader struct {
	path string
	data []byte
	err  error
}

func (f *fakeFTPUploader) Upload(_ context.Context, remoteRelPath string, data []byte) error {
	f.path = remoteRelPath
	f.data = append([]byte(nil), data...)
	return f.err
}

func TestCaptureAndFTPServiceUploadsAndCopiesFTPPath(t *testing.T) {
	uploader := &fakeFTPUploader{}
	clip := &fakeClipboard{}
	notifier := &fakeNotifier{}
	svc := &CaptureAndFTPService{
		Uploader:  uploader,
		Clipboard: clip,
		Notifier:  notifier,
		Cfg: domain.FTPConfig{
			Protocol:   domain.FTPProtocolFTP,
			PathPrefix: "snapgo/",
		},
	}

	if err := svc.ExecuteWithBytes(context.Background(), []byte("png")); err != nil {
		t.Fatalf("upload FTP screenshot: %v", err)
	}
	if string(uploader.data) != "png" {
		t.Fatalf("expected PNG bytes, got %q", string(uploader.data))
	}
	if !strings.HasPrefix(uploader.path, "snapgo/") || !strings.HasSuffix(uploader.path, ".png") {
		t.Fatalf("unexpected remote path %q", uploader.path)
	}
	if clip.text != "/"+uploader.path {
		t.Fatalf("expected FTP root path copied, got %q", clip.text)
	}
	if notifier.success != clip.text {
		t.Fatalf("expected success notification %q, got %q", clip.text, notifier.success)
	}
}

func TestCaptureAndFTPServiceCopiesConfiguredRootPath(t *testing.T) {
	uploader := &fakeFTPUploader{}
	clip := &fakeClipboard{}
	svc := &CaptureAndFTPService{
		Uploader:  uploader,
		Clipboard: clip,
		Cfg: domain.FTPConfig{
			Protocol:      domain.FTPProtocolSFTP,
			RootDirectory: "~/ftp/",
			PathPrefix:    "images",
		},
	}

	if err := svc.ExecuteWithBytes(context.Background(), []byte("png")); err != nil {
		t.Fatalf("upload SFTP screenshot: %v", err)
	}
	if clip.text != "~/ftp/"+uploader.path {
		t.Fatalf("expected configured SFTP root path copied, got %q", clip.text)
	}
}

func TestFTPShareTextJoinsConfiguredRootAndRemoteDirectory(t *testing.T) {
	const relPath = "snapgo/2026/07/20260713-110413-18lnbx.png"
	const want = "~/ftp/snapgo/2026/07/20260713-110413-18lnbx.png"
	if got := ftpShareText(domain.FTPProtocolSFTP, "~/ftp/", relPath); got != want {
		t.Fatalf("ftpShareText() = %q, want %q", got, want)
	}
}

func TestFTPShareTextUsesProtocolDefaultWhenRootDirectoryIsEmpty(t *testing.T) {
	const relPath = "snapgo/2026/07/image.png"
	tests := []struct {
		name     string
		protocol string
		want     string
	}{
		{name: "FTP", protocol: domain.FTPProtocolFTP, want: "/" + relPath},
		{name: "SFTP", protocol: domain.FTPProtocolSFTP, want: "~/" + relPath},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := ftpShareText(tt.protocol, "", relPath); got != tt.want {
				t.Fatalf("ftpShareText() = %q, want %q", got, tt.want)
			}
		})
	}
}

func TestCaptureAndFTPServiceRejectsTraversalBeforeUpload(t *testing.T) {
	uploader := &fakeFTPUploader{}
	notifier := &fakeNotifier{}
	svc := &CaptureAndFTPService{
		Uploader: uploader,
		Notifier: notifier,
		Cfg: domain.FTPConfig{
			Protocol:   domain.FTPProtocolSFTP,
			PathPrefix: "../../outside",
		},
	}

	err := svc.ExecuteWithBytes(context.Background(), []byte("png"))
	if err == nil {
		t.Fatal("expected traversal prefix to fail")
	}
	if uploader.path != "" {
		t.Fatalf("uploader should not run, got path %q", uploader.path)
	}
	if notifier.failure == "" {
		t.Fatal("expected failure notification")
	}
}

func TestCaptureAndFTPServiceSurfacesUploadFailure(t *testing.T) {
	want := errors.New("server unavailable")
	uploader := &fakeFTPUploader{err: want}
	clip := &fakeClipboard{}
	notifier := &fakeNotifier{}
	svc := &CaptureAndFTPService{
		Uploader:  uploader,
		Clipboard: clip,
		Notifier:  notifier,
		Cfg:       domain.FTPConfig{Protocol: domain.FTPProtocolFTP},
	}

	err := svc.ExecuteWithBytes(context.Background(), []byte("png"))
	if !errors.Is(err, want) {
		t.Fatalf("expected %v, got %v", want, err)
	}
	if clip.text != "" {
		t.Fatalf("clipboard should remain empty, got %q", clip.text)
	}
	if !strings.Contains(notifier.failure, "server unavailable") {
		t.Fatalf("unexpected failure notification %q", notifier.failure)
	}
}

func TestBuildFTPRemotePathNormalizesLoginRootMarkers(t *testing.T) {
	remotePath, err := buildFTPRemotePath("  ~////snapgo/  ")
	if err != nil {
		t.Fatalf("build remote path: %v", err)
	}
	if strings.HasPrefix(remotePath, "/") || !strings.HasPrefix(remotePath, "snapgo/") {
		t.Fatalf("expected relative snapgo path, got %q", remotePath)
	}
}