package wechat

import (
	"crypto/sha1"
	"encoding/hex"
	"encoding/json"
	"sort"
	"strings"
	"testing"
)

// TestHMACSHA256Hex 用 RFC 4231 测试向量校验 HMAC-SHA256 实现。
func TestHMACSHA256Hex(t *testing.T) {
	key := strings.Repeat("\x0b", 20) // 0x0b * 20
	data := "Hi There"
	want := "b0344c61d8db38535ca8afceaf0bf12b881dc200c9833da726e9376c2e32cff7"
	if got := hmacSHA256Hex(key, data); got != want {
		t.Fatalf("hmacSHA256Hex mismatch: got %s, want %s", got, want)
	}
}

// TestBuildPaymentSign 校验 signData 字典序、paySig 与 signature 的内部一致性。
func TestBuildPaymentSign(t *testing.T) {
	const (
		appKey     = "test-app-key"
		sessionKey = "test-session-key"
		offerID    = "wx1234567890"
		productID  = "monthly_vip"
		outTradeNo = "OD20260908120000abcdef"
		attach     = "uid=42"
	)

	virtualPayMu.Lock()
	defaultVirtualPayClient = &virtualPayClient{appKey: appKey, env: XPayEnvProd}
	virtualPayMu.Unlock()
	defer func() {
		virtualPayMu.Lock()
		defaultVirtualPayClient = nil
		virtualPayMu.Unlock()
	}()

	sign, err := BuildPaymentSign(offerID, productID, outTradeNo, attach, sessionKey, 1900)
	if err != nil {
		t.Fatalf("BuildPaymentSign error: %v", err)
	}

	// signData 字段必须按字典序排列（微信侧按字典序重组验签）。
	wantOrder := []string{"attach", "buyQuantity", "currencyType", "env", "goodsPrice", "offerId", "outTradeNo", "productId"}
	last := -1
	for _, key := range wantOrder {
		idx := strings.Index(sign.SignData, `"`+key+`"`)
		if idx < 0 {
			t.Fatalf("signData missing key %q: %s", key, sign.SignData)
		}
		if idx < last {
			t.Fatalf("signData key order wrong at %q: %s", key, sign.SignData)
		}
		last = idx
	}

	// signData 必须是合法 JSON，且 offerId 为字符串。
	var m map[string]any
	if err := json.Unmarshal([]byte(sign.SignData), &m); err != nil {
		t.Fatalf("signData is not valid JSON: %v", err)
	}
	if _, ok := m["offerId"].(string); !ok {
		t.Fatalf("offerId must be string, got %T", m["offerId"])
	}
	if v, ok := m["goodsPrice"].(float64); !ok || v != 1900 {
		t.Fatalf("goodsPrice mismatch: %v", m["goodsPrice"])
	}

	// paySig = hmac(appKey, "requestVirtualPayment&"+signData)；signature = hmac(sessionKey, signData)。
	wantPaySig := hmacSHA256Hex(appKey, requestVirtualPaymentURI+"&"+sign.SignData)
	wantSignature := hmacSHA256Hex(sessionKey, sign.SignData)
	if sign.PaySig != wantPaySig {
		t.Fatalf("paySig mismatch: got %s, want %s", sign.PaySig, wantPaySig)
	}
	if sign.Signature != wantSignature {
		t.Fatalf("signature mismatch: got %s, want %s", sign.Signature, wantSignature)
	}
}

// TestCheckURLSignature 校验消息推送 URL 验签（SHA1 字典序拼接）。
func TestCheckURLSignature(t *testing.T) {
	token := "my-token"
	timestamp := "1756000000"
	nonce := "abc123"

	// 独立计算期望值：["1756000000","abc123","my-token"] 字典序拼接后做 SHA1。
	arr := []string{token, timestamp, nonce}
	sort.Strings(arr)
	sum := sha1.Sum([]byte(arr[0] + arr[1] + arr[2]))
	wantSig := hex.EncodeToString(sum[:])

	if !CheckURLSignature(token, timestamp, nonce, wantSig) {
		t.Fatal("CheckURLSignature should pass with correct signature")
	}
	if CheckURLSignature(token, timestamp, nonce, "bad") {
		t.Fatal("CheckURLSignature should fail with wrong signature")
	}
	if CheckURLSignature("", timestamp, nonce, wantSig) {
		t.Fatal("CheckURLSignature should fail with empty token")
	}
}

// TestParseNotifyAndResponse 校验发货推送解析与应答构造。
func TestParseNotifyAndResponse(t *testing.T) {
	raw := []byte(`{
		"ToUserName":"gh_test",
		"FromUserName":"official_openid",
		"CreateTime":1756000000,
		"MsgType":"event",
		"Event":"xpay_goods_deliver_notify",
		"OpenId":"o_user",
		"OutTradeNo":"OD20260908120000abcdef",
		"Env":0,
		"WeChatPayInfo":{"MchOrderNo":"mch_123","TransactionId":"wx_123","PaidTime":1756000000},
		"GoodsInfo":{"ProductId":"monthly_vip","Quantity":1,"OrigPrice":1900,"ActualPrice":1900,"Attach":"uid=42"}
	}`)

	base, err := ParseNotify(raw)
	if err != nil {
		t.Fatalf("ParseNotify error: %v", err)
	}
	if base.Event != EventGoodsDeliverNotify {
		t.Fatalf("unexpected event: %s", base.Event)
	}
	if base.OutTradeNo != "OD20260908120000abcdef" {
		t.Fatalf("unexpected out_trade_no: %s", base.OutTradeNo)
	}

	var deliver XPayGoodsDeliverNotify
	if err := json.Unmarshal(raw, &deliver); err != nil {
		t.Fatalf("unmarshal deliver notify: %v", err)
	}
	if deliver.GoodsInfo.ProductID != "monthly_vip" || deliver.GoodsInfo.ActualPrice != 1900 {
		t.Fatalf("deliver goods info mismatch: %+v", deliver.GoodsInfo)
	}

	okBody := BuildNotifyResponse(true)
	if !strings.Contains(string(okBody), `"ErrCode":0`) {
		t.Fatalf("success response missing ErrCode 0: %s", okBody)
	}
	failBody := BuildNotifyResponse(false)
	if !strings.Contains(string(failBody), `"ErrCode":1`) {
		t.Fatalf("fail response missing ErrCode 1: %s", failBody)
	}
}

// TestIsOrderPaidStatus 校验订单支付状态白名单判断：仅已知成功枚举为已支付，未知/空串按未支付。
func TestIsOrderPaidStatus(t *testing.T) {
	cases := []struct {
		status string
		want   bool
	}{
		{XPayOrderStatusPaid, true},
		{"NOTPAY", false},
		{"CLOSED", false},
		{"UNKNOWN", false},
		{"", false},
	}
	for _, c := range cases {
		if got := IsOrderPaidStatus(c.status); got != c.want {
			t.Fatalf("IsOrderPaidStatus(%q) = %v, want %v", c.status, got, c.want)
		}
	}
}

// TestResolveEnvKey 校验环境自动选择规则：只填现网/只填沙箱/两把都填/两把都空。
func TestResolveEnvKey(t *testing.T) {
	// 只填现网 -> 现网
	key, env, err := resolveEnvKey("prod-key", "")
	if err != nil || key != "prod-key" || env != XPayEnvProd {
		t.Fatalf("only env key: key=%q env=%d err=%v", key, env, err)
	}
	// 只填沙箱 -> 沙箱
	key, env, err = resolveEnvKey("", "sandbox-key")
	if err != nil || key != "sandbox-key" || env != XPayEnvSandbox {
		t.Fatalf("only sandbox key: key=%q env=%d err=%v", key, env, err)
	}
	// 两把都填 -> 现网优先
	key, env, err = resolveEnvKey("prod-key", "sandbox-key")
	if err != nil || key != "prod-key" || env != XPayEnvProd {
		t.Fatalf("both keys: key=%q env=%d err=%v", key, env, err)
	}
	// 两把都空 -> 报错
	if _, _, err := resolveEnvKey("", ""); err == nil {
		t.Fatal("empty keys should return error")
	}
}