package insight

import (
	"strings"
	"testing"

	"git.amiirkhl.ir/starcoach-hackathon/zarinpal-analytics-backend/internal/peercomparison"
)

func TestDeterministicTransactionCopyDistinguishesPaymentStatesWithoutCausalClaims(t *testing.T) {
	copy := deterministicTransactionCopy(
		PeriodScope{JalaliLabelFA: "مرداد ۱۴۰۵"},
		"تیر ۱۴۰۵",
		aggregate{Sessions: 10, Paid: 7, Verified: 5, Unverified: 2, Failed: 2, Reversed: 1},
		aggregate{Sessions: 8, Paid: 6},
		true,
		TimeContext{},
		ConfidenceHigh,
	)

	body := copy.LatestObserved.Body
	for _, expected := range []string{"پرداخت‌شده و در انتظار تأیید", "تأیید نهایی", "ناموفق"} {
		if !strings.Contains(body, expected) {
			t.Fatalf("expected transaction copy to contain %q: %s", expected, body)
		}
	}
	if !strings.Contains(copy.Past.Body, "علت آن را مشخص نمی‌کند") {
		t.Fatalf("expected non-causal comparison language: %s", copy.Past.Body)
	}
}

func TestDeterministicPeerCopyNamesStrongestWeakestAndAction(t *testing.T) {
	result := peercomparison.Result{State: peercomparison.StateReady, Metrics: []peercomparison.Metric{
		{MetricID: "payment_success_rate", MerchantPerformancePercentile: "85.00"},
		{MetricID: "verification_completion_rate", MerchantPerformancePercentile: "40.00"},
	}}
	copy := deterministicPeerCopy(&result, "مرداد ۱۴۰۵")
	for _, expected := range []string{"مرداد ۱۴۰۵", "موفقیت پرداخت", "صدک 85.00", "تکمیل تأیید", "صدک 40.00"} {
		if !strings.Contains(copy.LatestObserved.Body, expected) {
			t.Fatalf("peer summary missing %q: %s", expected, copy.LatestObserved.Body)
		}
	}
	if !strings.Contains(copy.Options[0].Description, "تکمیل تأیید") {
		t.Fatalf("peer action did not target weakest category: %+v", copy.Options)
	}
}

func TestDeterministicTransactionCopyHandlesEmptyPeriod(t *testing.T) {
	copy := deterministicTransactionCopy(
		PeriodScope{JalaliLabelFA: "امروز"},
		"دیروز",
		aggregate{},
		aggregate{},
		false,
		TimeContext{},
		ConfidenceInsufficientData,
	)

	if strings.Contains(copy.LatestObserved.Body, "<nil>") {
		t.Fatalf("empty-period copy exposed an implementation value: %s", copy.LatestObserved.Body)
	}
	if !strings.Contains(copy.LatestObserved.Body, "ناموجود") {
		t.Fatalf("expected unavailable rates in empty-period copy: %s", copy.LatestObserved.Body)
	}
}

func TestDeterministicPeriodCopyUsesSelectedPeriodForOverview(t *testing.T) {
	copy := deterministicPeriodCopy(
		ModuleOverview,
		PeriodScope{JalaliLabelFA: "مرداد ۱۴۰۵"},
		"تیر ۱۴۰۵",
		aggregate{Sessions: 10, Paid: 7},
		aggregate{Sessions: 8, Paid: 6},
		true,
		TimeContext{},
		ConfidenceHigh,
	)

	if !strings.Contains(copy.LatestObserved.Body, "مرداد ۱۴۰۵") {
		t.Fatalf("selected period missing from summary: %s", copy.LatestObserved.Body)
	}
	if !strings.Contains(copy.Past.Body, "تیر ۱۴۰۵") {
		t.Fatalf("exact preceding period missing from comparison: %s", copy.Past.Body)
	}
}