package postgres

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

	"git.nianxx.cn/wangxuming/NianAIGC/backend/internal/billing"
)

func TestUpdateBillingPriceRulesUsesSingleGuardedStatement(t *testing.T) {
	q := &fakeQuerier{}
	db := NewDatabase(Config{Backend: BackendPostgres}, q)
	patch := billing.BulkPricePatch{RuleIDs: []string{"first", "second"}, MarkupMultiplier: 1.75}
	if _, err := db.UpdateBillingPriceRules(context.Background(), patch); !errors.Is(err, billing.ErrPriceNotFound) {
		t.Fatalf("empty result error = %v", err)
	}
	if q.sql != UpdateBillingPriceRulesSQL || !reflect.DeepEqual(q.args, []any{patch.RuleIDs, patch.MarkupMultiplier}) {
		t.Fatalf("query = %q, args = %#v", q.sql, q.args)
	}
	for _, clause := range []string{"FOR UPDATE", "count(*) = cardinality($1::text[])", "AND (SELECT all_present FROM eligible)", "jsonb_set(tier.value", "UPDATE public.billing_price_rules"} {
		if !strings.Contains(q.sql, clause) {
			t.Fatalf("missing atomic bulk update clause %q", clause)
		}
	}
	q.sql = ""
	if _, err := db.UpdateBillingPriceRules(context.Background(), billing.BulkPricePatch{MarkupMultiplier: 2}); !errors.Is(err, billing.ErrPriceNotFound) || q.sql != "" {
		t.Fatalf("empty ID list issued a query: %q, %v", q.sql, err)
	}
}