package alipay_test

import (
	"context"
	"crypto/rand"
	"crypto/rsa"
	"crypto/sha256"
	"encoding/base64"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"crypto"

	"github.com/wangjia/pay/internal/provider"
	ali "github.com/wangjia/pay/internal/provider/alipay"
)

// jiu 反馈波 item 1:Metadata["is_mobile"]=="1" 应走 TradeWapPay,产出与
// page(FAST_INSTANT_TRADE_PAY)不同的收银台跳转(product_code=QUICK_WAP_WAY)。
// TradeWapPay/TradePagePay 都是纯本地签名构造 URL(不出网),同 alipay_test.go
// TestCreateRedirect 的用法,无需 httptest。
func TestCreateWapDiffersFromPage(t *testing.T) {
	appPriv, _, aliPub := genKeys(t)
	p := ali.New(buildClient(t, appPriv, aliPub))

	page, err := p.Create(context.Background(), provider.CreateRequest{
		OutTradeNo: "PAY-WAP-1", Subject: "Pro 年付", AmountMinor: 19900, Currency: "CNY",
		ReturnURL: "https://x/return",
	})
	if err != nil {
		t.Fatalf("create page: %v", err)
	}
	wap, err := p.Create(context.Background(), provider.CreateRequest{
		OutTradeNo: "PAY-WAP-1", Subject: "Pro 年付", AmountMinor: 19900, Currency: "CNY",
		ReturnURL: "https://x/return", Metadata: map[string]string{"is_mobile": "1"},
	})
	if err != nil {
		t.Fatalf("create wap: %v", err)
	}
	if page.RenderType != provider.RenderRedirect || wap.RenderType != provider.RenderRedirect {
		t.Fatalf("render_type: page=%v wap=%v, want both redirect", page.RenderType, wap.RenderType)
	}
	pageURL, _ := page.Payload["url"].(string)
	wapURL, _ := wap.Payload["url"].(string)
	if pageURL == wapURL {
		t.Fatalf("wap URL 应与 page URL 不同(不同 product_code/签名参数), got 相同: %q", pageURL)
	}
	if !strings.Contains(wapURL, "QUICK_WAP_WAY") {
		t.Fatalf("wap URL 应带 product_code=QUICK_WAP_WAY, got %q", wapURL)
	}
	if !strings.Contains(pageURL, "FAST_INSTANT_TRADE_PAY") {
		t.Fatalf("page URL 应带 product_code=FAST_INSTANT_TRADE_PAY, got %q", pageURL)
	}
}

// fakeAlipayPreCreate 返回一份用"支付宝侧"私钥签名的 alipay.trade.precreate 响应
// (与 alipay_refund_test.go 的 fakeAlipayRefund 同一套 fixture 手法)。
func fakeAlipayPreCreate(t *testing.T, aliPriv *rsa.PrivateKey, qrCode string) *httptest.Server {
	t.Helper()
	return httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		node := map[string]any{
			"code": "10000", "msg": "Success",
			"out_trade_no": "PAY-QR-1", "qr_code": qrCode,
		}
		nodeJSON, _ := json.Marshal(node)
		h := sha256.Sum256(nodeJSON)
		sig, _ := rsa.SignPKCS1v15(rand.Reader, aliPriv, crypto.SHA256, h[:])
		resp := map[string]any{
			"alipay_trade_precreate_response": json.RawMessage(nodeJSON),
			"sign":                            base64.StdEncoding.EncodeToString(sig),
		}
		w.Header().Set("Content-Type", "application/json")
		_ = json.NewEncoder(w).Encode(resp)
	}))
}

// jiu 反馈波 item 2:Metadata["render"]=="qr" 应走 TradePreCreate(当面付),
// 产出 render_type=qr,payload 三字段 {qr_content, display_amount, currency}。
func TestCreateQR(t *testing.T) {
	aliKey, err := rsa.GenerateKey(rand.Reader, 2048)
	if err != nil {
		t.Fatalf("gen ali key: %v", err)
	}
	ts := fakeAlipayPreCreate(t, aliKey, "https://qr.alipay.com/bax12345")
	defer ts.Close()
	p := ali.New(buildRefundClient(t, ts.URL, &aliKey.PublicKey)) // 复用 alipay_refund_test.go 的 sandbox-gateway client builder

	sess, err := p.Create(context.Background(), provider.CreateRequest{
		OutTradeNo: "PAY-QR-1", Subject: "Pro 年付", AmountMinor: 19900, Currency: "CNY",
		Metadata: map[string]string{"render": "qr"},
	})
	if err != nil {
		t.Fatalf("create qr: %v", err)
	}
	if sess.RenderType != provider.RenderQR {
		t.Fatalf("render_type = %v, want qr", sess.RenderType)
	}
	if sess.ExpiresAt == nil {
		t.Fatal("qr session 应带 ExpiresAt(当面付默认 2 小时窗口)")
	}
	if sess.Payload["qr_content"] != "https://qr.alipay.com/bax12345" {
		t.Fatalf("payload.qr_content = %v", sess.Payload["qr_content"])
	}
	if sess.Payload["display_amount"] != "199" { // money.Format 去尾零(19900 分 → "199")
		t.Fatalf("payload.display_amount = %v, want 199", sess.Payload["display_amount"])
	}
	if sess.Payload["currency"] != "CNY" {
		t.Fatalf("payload.currency = %v, want CNY", sess.Payload["currency"])
	}
}

// alipay.trade.precreate 被渠道拒绝(如金额超限)时 Create 应报错、不返回 Session。
func TestCreateQRChannelRejected(t *testing.T) {
	aliKey, err := rsa.GenerateKey(rand.Reader, 2048)
	if err != nil {
		t.Fatalf("gen ali key: %v", err)
	}
	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		node := map[string]any{"code": "40004", "msg": "Business Failed", "sub_code": "ACQ.INVALID_PARAMETER", "sub_msg": "参数无效"}
		nodeJSON, _ := json.Marshal(node)
		h := sha256.Sum256(nodeJSON)
		sig, _ := rsa.SignPKCS1v15(rand.Reader, aliKey, crypto.SHA256, h[:])
		resp := map[string]any{
			"alipay_trade_precreate_response": json.RawMessage(nodeJSON),
			"sign":                            base64.StdEncoding.EncodeToString(sig),
		}
		w.Header().Set("Content-Type", "application/json")
		_ = json.NewEncoder(w).Encode(resp)
	}))
	defer ts.Close()
	p := ali.New(buildRefundClient(t, ts.URL, &aliKey.PublicKey))

	sess, err := p.Create(context.Background(), provider.CreateRequest{
		OutTradeNo: "PAY-QR-2", Subject: "Pro 年付", AmountMinor: 19900, Currency: "CNY",
		Metadata: map[string]string{"render": "qr"},
	})
	if err == nil {
		t.Fatalf("want 渠道拒绝返回 error, got session=%+v", sess)
	}
	if sess != nil {
		t.Fatalf("渠道拒绝时不应返回 Session, got %+v", sess)
	}
}