package campaigns

import (
	"context"
	"strings"
	"testing"

	"github.com/google/uuid"
)

func TestLatestVersionsByCampaignIDsSQL_batchesDistinctOn(t *testing.T) {
	if !strings.Contains(latestVersionsByCampaignIDsSQL, "DISTINCT ON (campaign_id)") {
		t.Fatal("expected DISTINCT ON so each campaign gets one latest version")
	}
	if !strings.Contains(latestVersionsByCampaignIDsSQL, "ANY($1)") {
		t.Fatal("expected ANY($1) batch filter over campaign IDs")
	}
	if !strings.Contains(latestVersionsByCampaignIDsSQL, "ORDER BY campaign_id, version DESC") {
		t.Fatal("expected ORDER BY campaign_id, version DESC for DISTINCT ON")
	}
}

func TestApplyVersionFields(t *testing.T) {
	c := Campaign{ID: uuid.New()}
	v := Version{
		ID:        uuid.New(),
		Version:   3,
		Subject:   "Hello",
		HTMLBody:  "<p>Hi</p>",
		PlainBody: "Hi",
	}
	applyVersionFields(&c, v)
	if c.Subject != "Hello" || c.HTMLBody != "<p>Hi</p>" || c.PlainBody != "Hi" {
		t.Fatalf("subject/body not applied: %+v", c)
	}
	if c.LatestVersion == nil || c.LatestVersion.Version != 3 {
		t.Fatalf("LatestVersion not applied: %+v", c.LatestVersion)
	}
}

func TestAttachLatestVersionsEmpty(t *testing.T) {
	s := &Service{}
	if err := s.attachLatestVersions(context.TODO(), nil); err != nil {
		t.Fatalf("empty page should no-op: %v", err)
	}
	if err := s.attachLatestVersions(context.TODO(), []Campaign{}); err != nil {
		t.Fatalf("empty slice should no-op: %v", err)
	}
}