package main

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

// TestCopyDirContentsCreatesDestination pins the bug that broke copying a QSL
// design between profiles.
//
// copyDirContents wrote straight into dst without creating it, so the first
// os.Create failed with ENOENT. The caller was written as "ignore
// os.IsNotExist", meaning "the source has no assets, that is fine" — and ENOENT
// from the failed write matched it exactly. Nothing was copied, no error was
// reported, and the operator saw "copied design is incomplete: hero photo file
// … not found" from the validation two lines later.
func TestCopyDirContentsCreatesDestination(t *testing.T) {
	base := t.TempDir()
	src := filepath.Join(base, "src")
	if err := os.MkdirAll(filepath.Join(src, "sub"), 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(src, "img_25c06bda.jpg"), []byte("hero"), 0o644); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(src, "sub", "back.png"), []byte("back"), 0o644); err != nil {
		t.Fatal(err)
	}

	// dst does not exist — the case of every first copy.
	dst := filepath.Join(base, "dst")
	if err := copyDirContents(src, dst); err != nil {
		t.Fatalf("copyDirContents: %v", err)
	}
	for name, want := range map[string]string{
		"img_25c06bda.jpg": "hero",
		"sub/back.png":     "back",
	} {
		got, err := os.ReadFile(filepath.Join(dst, filepath.FromSlash(name)))
		if err != nil {
			t.Errorf("%s: %v", name, err)
			continue
		}
		if string(got) != want {
			t.Errorf("%s = %q, want %q", name, got, want)
		}
	}
}

// A missing SOURCE is still an error from copyDirContents itself — it is the
// caller that decides whether a design with no pictures is acceptable, and it
// can only decide that if this does not quietly succeed.
func TestCopyDirContentsMissingSource(t *testing.T) {
	base := t.TempDir()
	if err := copyDirContents(filepath.Join(base, "nope"), filepath.Join(base, "dst")); err == nil {
		t.Fatal("copying a missing source returned no error")
	} else if !os.IsNotExist(err) {
		t.Fatalf("want a not-exist error, got %v", err)
	}
}