//go:build unit

package service

import (
	"strings"
	"testing"

	"github.com/stretchr/testify/require"
)

// These tests guard against fmt.Sprintf arg-count mismatches in the email
// templates. A mismatch would produce "%!(EXTRA ...)" or "%!v(MISSING)" in
// the output, which these assertions will catch.

// ---------- buildBalanceLowEmailBody ----------

func TestBuildBalanceLowEmailBody_ContainsRequiredFields(t *testing.T) {
	s := &BalanceNotifyService{}
	body := s.buildBalanceLowEmailBody("Alice", 3.14, 10.0, "MySite", "")

	// All substituted values should appear in the output.
	require.Contains(t, body, "MySite")
	require.Contains(t, body, "Alice")
	require.Contains(t, body, "$3.14")
	require.Contains(t, body, "$10.00")

	// No fmt.Sprintf format error markers.
	require.NotContains(t, body, "%!")
	require.NotContains(t, body, "MISSING")
	require.NotContains(t, body, "EXTRA")
}

func TestBuildBalanceLowEmailBody_WithRechargeURL(t *testing.T) {
	s := &BalanceNotifyService{}
	body := s.buildBalanceLowEmailBody("Bob", 5.0, 20.0, "Site", "https://example.com/pay")

	// The recharge anchor element should appear with the URL.
	require.Contains(t, body, `href="https://example.com/pay"`)
	require.Contains(t, body, "立即充值")
	require.NotContains(t, body, "%!")
}

func TestBuildBalanceLowEmailBody_RechargeURLEscaped(t *testing.T) {
	s := &BalanceNotifyService{}
	// Try a URL with characters that need HTML escaping.
	body := s.buildBalanceLowEmailBody("u", 1.0, 5.0, "Site", `https://example.com/?a=1&b=<script>`)

	// `&` and `<` should be escaped in the href.
	require.Contains(t, body, "&amp;")
	require.Contains(t, body, "&lt;script&gt;")
	require.NotContains(t, body, "<script>")
}

func TestBuildBalanceLowEmailBody_NoRechargeURLOmitsButton(t *testing.T) {
	s := &BalanceNotifyService{}
	body := s.buildBalanceLowEmailBody("u", 1.0, 5.0, "Site", "")
	// The anchor element should not be rendered (style class may still appear).
	require.NotContains(t, body, `<a href`)
	require.NotContains(t, body, "立即充值")
}

// ---------- buildQuotaAlertEmailBody ----------

func TestBuildQuotaAlertEmailBody_AllFieldsPresent(t *testing.T) {
	s := &BalanceNotifyService{}
	body := s.buildQuotaAlertEmailBody(
		42,                      // accountID
		"acc-foo",               // accountName
		"anthropic",             // platform
		"日限额 / Daily",          // dimLabel
		750.50,                  // used
		1000.0,                  // limit
		249.50,                  // remaining
		"$249.50",               // thresholdDisplay
		"MySite",                // siteName
	)

	require.Contains(t, body, "MySite")
	require.Contains(t, body, "#42")
	require.Contains(t, body, "acc-foo")
	require.Contains(t, body, "anthropic")
	require.Contains(t, body, "Daily")
	require.Contains(t, body, "$750.50")
	require.Contains(t, body, "$1000.00")
	require.Contains(t, body, "$249.50")

	// No format error markers.
	require.NotContains(t, body, "%!")
	require.NotContains(t, body, "MISSING")
	require.NotContains(t, body, "EXTRA")
}

func TestBuildQuotaAlertEmailBody_UnlimitedDisplay(t *testing.T) {
	s := &BalanceNotifyService{}
	body := s.buildQuotaAlertEmailBody(
		1, "n", "p", "dim",
		100.0, 0.0, // limit=0 triggers unlimited branch
		0.0, "30%", "Site",
	)
	require.Contains(t, body, "无限制")
	require.Contains(t, body, "Unlimited")
}

func TestBuildQuotaAlertEmailBody_PercentageThresholdDisplay(t *testing.T) {
	s := &BalanceNotifyService{}
	body := s.buildQuotaAlertEmailBody(
		1, "n", "p", "dim",
		700.0, 1000.0, 300.0,
		"30%", // percentage-formatted threshold
		"Site",
	)
	require.Contains(t, body, "30%")
	require.NotContains(t, body, "%!")
}

func TestBuildQuotaAlertEmailBody_RemainingClampedAtZero(t *testing.T) {
	// Even though caller is responsible for clamping, this test documents the
	// display behavior with remaining=0.
	s := &BalanceNotifyService{}
	body := s.buildQuotaAlertEmailBody(
		1, "n", "p", "dim",
		1500.0, 1000.0, 0.0, // used > limit (over-quota)
		"$100.00", "Site",
	)
	require.Contains(t, body, "$0.00")
}

// ---------- sanity checks on the CSS `%%` escape ----------

func TestBuildBalanceLowEmailBody_NoCSSFormatError(t *testing.T) {
	s := &BalanceNotifyService{}
	body := s.buildBalanceLowEmailBody("u", 1.0, 5.0, "Site", "")
	// CSS `linear-gradient(135deg, #f59e0b 0%, #d97706 100%)` should appear with
	// literal percent signs (from the %% escape in the template).
	require.True(t,
		strings.Contains(body, "0%") && strings.Contains(body, "100%"),
		"CSS gradient percentages not rendered; got: %s", body)
}

func TestBuildQuotaAlertEmailBody_NoCSSFormatError(t *testing.T) {
	s := &BalanceNotifyService{}
	body := s.buildQuotaAlertEmailBody(1, "n", "p", "d", 0, 0, 0, "$0.00", "Site")
	require.True(t,
		strings.Contains(body, "0%") && strings.Contains(body, "100%"),
		"CSS gradient percentages not rendered; got: %s", body)
}
