package notify

import (
	"strings"
	"testing"
)

func TestBuildFileIDUniqueAcrossBurst(t *testing.T) {
	const total = 512
	seen := make(map[string]struct{}, total)
	for i := 0; i < total; i++ {
		id := buildFileID("report.txt")
		if _, ok := seen[id]; ok {
			t.Fatalf("duplicate file id generated: %q", id)
		}
		seen[id] = struct{}{}
	}
}

func TestBuildFileIDKeepsReadableBaseName(t *testing.T) {
	id := buildFileID("/tmp/demo/report.txt")
	if !strings.HasPrefix(id, "report.txt-") {
		t.Fatalf("unexpected file id prefix: %q", id)
	}

	parts := strings.Split(id, "-")
	if got, want := len(parts), 5; got != want {
		t.Fatalf("unexpected file id segment count: got %d want %d, id=%q", got, want, id)
	}
	for _, part := range parts[1:] {
		if part == "" {
			t.Fatalf("unexpected empty file id segment: %q", id)
		}
	}
}

func TestBuildFileIDFallsBackToUnnamedBase(t *testing.T) {
	id := buildFileID("")
	if !strings.HasPrefix(id, "unnamed-") {
		t.Fatalf("unexpected unnamed file id prefix: %q", id)
	}
}

func TestNewFileMetaEnvelopeKeepsOptionalMeta(t *testing.T) {
	env := newFileMetaEnvelope("file-1", "/tmp/demo/report.txt", 123, "sum", 0o640, 123456789)
	if got, want := env.File.Mode, uint32(0o640); got != want {
		t.Fatalf("mode mismatch: got %o want %o", got, want)
	}
	if got, want := env.File.ModTime, int64(123456789); got != want {
		t.Fatalf("modtime mismatch: got %d want %d", got, want)
	}
}