package artifacts

import (
	"bytes"
	"regexp"
	"strings"
	"testing"
	"time"
)

func TestNewRunIDWithFormat(t *testing.T) {
	now := time.Date(2026, 5, 15, 3, 15, 22, 0, time.UTC)
	random := bytes.NewReader([]byte{0xa1, 0xb2, 0xc3, 0xd4})

	runID, err := NewRunIDWith(now, random)
	if err != nil {
		t.Fatalf("NewRunIDWith() error = %v", err)
	}
	if runID != "20260515T031522Z-a1b2c3d4" {
		t.Fatalf("runID = %q, want %q", runID, "20260515T031522Z-a1b2c3d4")
	}
}

func TestNewRunIDWithShape(t *testing.T) {
	runID, err := NewRunIDWith(time.Now().UTC(), bytes.NewReader([]byte{0x01, 0x02, 0x03, 0x04}))
	if err != nil {
		t.Fatalf("NewRunIDWith() error = %v", err)
	}
	pattern := regexp.MustCompile(`^\d{8}T\d{6}Z-[0-9a-f]{8}$`)
	if !pattern.MatchString(runID) {
		t.Fatalf("runID = %q, want pattern %q", runID, pattern.String())
	}
	suffix := runID[len(runID)-8:]
	if strings.ToLower(suffix) != suffix {
		t.Fatalf("runID suffix = %q, want lowercase", suffix)
	}
}