package payment

import (
	"crypto/aes"
	"crypto/cipher"
	"encoding/base64"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"
)

func TestWechatV3WithoutPlatformCertificateLoadsVerificationKey(t *testing.T) {
	_, merchantPrivatePEM, _ := testRSAKeyPair(t)
	_, _, platformPublicPEM := testRSAKeyPair(t)
	apiV3Key := "01234567890123456789012345678901"
	block, err := aes.NewCipher([]byte(apiV3Key))
	if err != nil {
		t.Fatal(err)
	}
	gcm, err := cipher.NewGCM(block)
	if err != nil {
		t.Fatal(err)
	}
	nonce, associatedData := "0123456789ab", "certificate"
	ciphertext := base64.StdEncoding.EncodeToString(gcm.Seal(nil, []byte(nonce), []byte(platformPublicPEM), []byte(associatedData)))
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/v3/certificates" {
			t.Errorf("unexpected path %q", r.URL.Path)
		}
		w.Header().Set("Content-Type", "application/json")
		_ = json.NewEncoder(w).Encode(map[string]any{"data": []any{map[string]any{
			"serial_no":      "platform-serial",
			"effective_time": time.Now().Add(-time.Hour).Format(time.RFC3339),
			"expire_time":    time.Now().Add(24 * time.Hour).Format(time.RFC3339),
			"encrypt_certificate": map[string]any{
				"algorithm": "AEAD_AES_256_GCM", "nonce": nonce,
				"associated_data": associatedData, "ciphertext": ciphertext,
			},
		}}})
	}))
	defer server.Close()

	client, err := newWechatV3Client(map[string]any{
		"merchant_id": "merchant", "serial_no": "merchant-serial",
		"api_v3_key": apiV3Key, "private_key": merchantPrivatePEM,
		"create_url": server.URL,
	}, "create_url")
	if err != nil {
		t.Fatal(err)
	}
	if client.WxPublicKeyMap()["platform-serial"] == nil {
		t.Fatal("fetched platform key was not installed for signature verification")
	}
}

func TestWechatV3WithoutPlatformCertificateFetchesFromConfiguredEndpoint(t *testing.T) {
	_, merchantPrivatePEM, _ := testRSAKeyPair(t)
	requestPath := ""
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		requestPath = r.URL.Path
		w.WriteHeader(http.StatusServiceUnavailable)
	}))
	defer server.Close()

	_, err := newWechatV3Client(map[string]any{
		"merchant_id": "merchant", "serial_no": "merchant-serial",
		"api_v3_key":  "01234567890123456789012345678901",
		"private_key": merchantPrivatePEM, "create_url": server.URL,
	}, "create_url")
	if requestPath != "/v3/certificates" {
		t.Fatalf("certificate request path = %q", requestPath)
	}
	if err == nil || !strings.Contains(err.Error(), "自动获取平台证书失败") {
		t.Fatalf("certificate fetch error = %v", err)
	}
}