package gateway_test

import (
	"context"
	"errors"
	"testing"

	"github.com/wangjia/pay/config"
	"github.com/wangjia/pay/internal/accounts"
	"github.com/wangjia/pay/internal/gateway"
	"github.com/wangjia/pay/internal/model"
	"github.com/wangjia/pay/internal/provider"
	"github.com/wangjia/pay/internal/provider/fake"
	"github.com/wangjia/pay/internal/store"
)

// --- 测试替身 ---

type stubResolver struct{}

func (stubResolver) Resolve(sku, currency string) (int64, string, string, error) {
	if sku != "pro_year" {
		return 0, "", "", gateway.ErrProductNotFound
	}
	// 结算币种驱动金额:USDT 6 位, 其余按分。测试只用 fake(USDT)。
	switch currency {
	case "USDT":
		return 29990000, "Pro 年付", "pro_year", nil
	case "CNY":
		return 19900, "Pro 年付", "pro_year", nil
	default:
		return 0, "", "", gateway.ErrProductNotFound
	}
}

type spyEnqueuer struct {
	calls    []map[string]any
	failNext bool // 置 true 模拟 outbox 入队失败(settle 崩溃窗口测试用),命中后消费一次即清零。
	// failOnEventType 非空时,下一次遇到该 event_type 的入队调用失败一次(消费后清空)——用于
	// 测试"同一 HandleCallback 内先后两次 Enqueue,只让第二次(如 subscription.created)失败,
	// 第一次(如 payment.succeeded)先成功"这类场景,failNext 做不到按 event_type 区分。
	failOnEventType string
	seen            map[string]bool // 镜像真实 WebhookStore.EnqueueDelivery 的 (out_trade_no,event_type,
	// refund_id) 唯一键 ON CONFLICT DO NOTHING:重复 key 静默 no-op(不追加 calls,也不算失败)。
	// 修复"重投补入队自愈"后,业务代码会在 duplicate/重投分支也调用 Enqueue,若 spy 仍是无脑
	// 计数器就会把 outbox 天然幂等的重复行误判成"多发了一次 webhook",这里镜像真实幂等语义。
}

func (s *spyEnqueuer) Enqueue(outTradeNo, bizSystem, eventType, refundID string, data map[string]any) error {
	if s.failNext {
		s.failNext = false
		return errors.New("outbox down")
	}
	if s.failOnEventType != "" && eventType == s.failOnEventType {
		s.failOnEventType = ""
		return errors.New("outbox down")
	}
	key := outTradeNo + "|" + eventType + "|" + refundID
	if s.seen == nil {
		s.seen = make(map[string]bool)
	}
	if s.seen[key] {
		return nil // 幂等 no-op,行已存在
	}
	s.seen[key] = true
	s.calls = append(s.calls, data)
	return nil
}

func newGateway(t *testing.T) (*gateway.Gateway, *fake.Provider, *spyEnqueuer, *store.OrderStore) {
	t.Helper()
	db := model.OpenTestDB(t)
	orders := store.NewOrderStore(db)
	refunds := store.NewRefundStore(db)
	subs := store.NewSubscriptionStore(db)
	chargebacks := store.NewChargebackStore(db)
	preg := provider.NewRegistry()
	fp := fake.New()
	preg.Register(fp)
	// fake 注册在 method "fake";账户按 channel="fake" region="global" 配。
	areg := accounts.New([]config.AccountConfig{
		{AccountID: "fake-a1", Channel: "fake", Region: "global", Enabled: true, Weight: 1},
		{AccountID: "fake-a2", Channel: "fake", Region: "global", Enabled: true, Weight: 1},
	})
	picker := accounts.NewRouter(areg, nil, nil) // 默认 round_robin
	spy := &spyEnqueuer{}
	g := gateway.New(orders, refunds, preg, picker, stubResolver{}, spy, "global", subs, chargebacks)
	return g, fp, spy, orders
}

func TestCreateOrderPipeline(t *testing.T) {
	g, _, _, orders := newGateway(t)
	res, err := g.CreateOrder(context.Background(), gateway.CreateOrderInput{
		SKU: "pro_year", Method: "fake", BizSystem: "pangolin", BizRef: "u-1",
	})
	if err != nil {
		t.Fatalf("CreateOrder: %v", err)
	}
	if res.OrderNo == "" || res.Session.RenderType != string(provider.RenderCryptoAddress) {
		t.Fatalf("result = %+v", res)
	}
	if res.Session.Payload["currency"] != "USDT" {
		t.Fatalf("payload = %+v", res.Session.Payload)
	}
	// 落库:order pending + attempt pending 带 provider_ref。
	o, err := orders.GetOrder(res.OrderNo)
	if err != nil || o.Status != model.OrderPendingV2 || o.AmountMinor != 29990000 {
		t.Fatalf("order = %+v, %v", o, err)
	}
	atts, _ := orders.ListAttemptsByStatus(model.AttemptPending, 10)
	if len(atts) != 1 || atts[0].Channel != "fake" || atts[0].AccountID != "fake-a1" {
		t.Fatalf("attempt = %+v", atts)
	}
}

func TestCreateOrderPersistsBizCode(t *testing.T) {
	g, _, _, orders := newGateway(t)
	res, err := g.CreateOrder(context.Background(), gateway.CreateOrderInput{
		SKU: "pro_year", Method: "fake", BizSystem: "pangolin", BizRef: "u-1",
	})
	if err != nil {
		t.Fatalf("create: %v", err)
	}
	o, err := orders.GetOrder(res.OrderNo)
	if err != nil {
		t.Fatalf("get order: %v", err)
	}
	if o.BizCode != "pro_year" { // stubResolver 的 bizCode
		t.Fatalf("order.BizCode = %q, want pro_year", o.BizCode)
	}
}

func TestCreateOrderErrors(t *testing.T) {
	g, _, _, _ := newGateway(t)
	ctx := context.Background()
	if _, err := g.CreateOrder(ctx, gateway.CreateOrderInput{SKU: "nope", Method: "fake"}); err != gateway.ErrProductNotFound {
		t.Fatalf("未知 sku 应 ErrProductNotFound, got %v", err)
	}
	if _, err := g.CreateOrder(ctx, gateway.CreateOrderInput{SKU: "pro_year", Method: "ghost"}); err == nil {
		t.Fatalf("未知 method 应报错")
	}
}

func TestRetryAndCancel(t *testing.T) {
	g, _, _, orders := newGateway(t)
	ctx := context.Background()
	res, _ := g.CreateOrder(ctx, gateway.CreateOrderInput{SKU: "pro_year", Method: "fake", BizSystem: "pangolin", BizRef: "u-1"})

	// retry:弃旧尝试 + 建新尝试(order 仍 pending)。
	r2, err := g.RetryOrder(ctx, res.OrderNo, "fake", nil)
	if err != nil || r2.OrderNo != res.OrderNo {
		t.Fatalf("retry = %+v, %v", r2, err)
	}
	pend, _ := orders.ListAttemptsByStatus(model.AttemptPending, 10)
	if len(pend) != 1 {
		t.Fatalf("retry 后应恰 1 个 pending 尝试, got %d", len(pend))
	}

	// cancel pending → true;再 cancel → false。
	ok, err := g.CancelOrder(res.OrderNo)
	if err != nil || !ok {
		t.Fatalf("cancel = %v, %v", ok, err)
	}
	if ok2, _ := g.CancelOrder(res.OrderNo); ok2 {
		t.Fatalf("已取消单再取消应 false")
	}
	// canceled 单不可 retry。
	if _, err := g.RetryOrder(ctx, res.OrderNo, "fake", nil); err != gateway.ErrOrderNotPending {
		t.Fatalf("canceled 单 retry 应 ErrOrderNotPending, got %v", err)
	}
}

func TestRetrySwitchesAccount(t *testing.T) {
	g, _, _, orders := newGateway(t)
	ctx := context.Background()
	res, _ := g.CreateOrder(ctx, gateway.CreateOrderInput{SKU: "pro_year", Method: "fake", BizSystem: "pangolin", BizRef: "u-1"})

	// 首单落 fake-a1(round_robin 计数 0);retry 排除 a1 → 必落 fake-a2。
	if _, err := g.RetryOrder(ctx, res.OrderNo, "fake", nil); err != nil {
		t.Fatalf("retry: %v", err)
	}
	pend, _ := orders.ListAttemptsByStatus(model.AttemptPending, 10)
	if len(pend) != 1 || pend[0].AccountID != "fake-a2" {
		t.Fatalf("retry 应换到 fake-a2, got %+v", pend)
	}
}

// jiu 反馈波 item 1:CreateOrderInput.Metadata / RetryOrder 的 metadata 参数须原样
// 透传到 provider.CreateRequest.Metadata,不能在 gateway 管线里被丢弃或改写。
func TestMetadataPassthroughToProvider(t *testing.T) {
	g, fp, _, _ := newGateway(t)
	ctx := context.Background()

	res, err := g.CreateOrder(ctx, gateway.CreateOrderInput{
		SKU: "pro_year", Method: "fake", BizSystem: "pangolin", BizRef: "u-1",
		Metadata: map[string]string{"is_mobile": "1"},
	})
	if err != nil {
		t.Fatalf("create: %v", err)
	}
	if got := fp.LastMetadata(); got["is_mobile"] != "1" {
		t.Fatalf("CreateOrder 后 provider 收到的 metadata = %+v, want is_mobile=1", got)
	}

	if _, err := g.RetryOrder(ctx, res.OrderNo, "fake", map[string]string{"render": "qr"}); err != nil {
		t.Fatalf("retry: %v", err)
	}
	if got := fp.LastMetadata(); got["render"] != "qr" {
		t.Fatalf("RetryOrder 后 provider 收到的 metadata = %+v, want render=qr", got)
	}
}

func TestCreateOrderCurrencyFromChannelCapability(t *testing.T) {
	g, _, _, orders := newGateway(t) // fake provider, SettleCurrencies=["USDT"]
	res, err := g.CreateOrder(context.Background(), gateway.CreateOrderInput{SKU: "pro_year", Method: "fake"})
	if err != nil {
		t.Fatalf("create: %v", err)
	}
	o, _ := orders.GetOrder(res.OrderNo)
	if o.Currency != "USDT" || o.AmountMinor != 29990000 {
		t.Fatalf("order = %s/%d want USDT/29990000", o.Currency, o.AmountMinor)
	}
}

// cnyOnlyProvider 是本测试文件专用的最小 stub provider(结算币种固定 CNY),
// 陪 fake(结算 USDT)凑出"两个结算币种不同的方法"场景,用来直测 RetryOrder 换渠道
// 触发 gateway.ErrCurrencyMismatch 的分支(gateway.go:177 附近)。不复用
// internal/provider/provider_test.go 的 stubProvider——那个类型未导出且在
// package provider_test 里,gateway_test 包拿不到。
type cnyOnlyProvider struct{}

func (cnyOnlyProvider) Method() string { return "cny-only" }

func (cnyOnlyProvider) Capabilities() provider.Capabilities {
	return provider.Capabilities{
		RenderTypes:      []provider.RenderType{provider.RenderQR},
		SettleCurrencies: []string{"CNY"},
	}
}

func (cnyOnlyProvider) Create(_ context.Context, req provider.CreateRequest) (*provider.Session, error) {
	return &provider.Session{ProviderRef: "CNYONLY-" + req.OutTradeNo, RenderType: provider.RenderQR, Payload: map[string]any{}}, nil
}

func (cnyOnlyProvider) VerifyCallback(context.Context, provider.CallbackInput) (*provider.PaidEvent, error) {
	return nil, errors.New("cnyOnlyProvider: not implemented")
}

func (cnyOnlyProvider) Query(context.Context, provider.QueryRequest) (*provider.PaidEvent, error) {
	return &provider.PaidEvent{Status: provider.PaidPending}, nil
}

// TestRetryOrderCurrencyMismatch 直测 gateway.go:177 附近的触发条件:换到一个结算
// 币种与订单不同的渠道 retry,必须报 ErrCurrencyMismatch(而不是静默换币重定价——
// P3 范围之外,见 RetryOrder 注释)。此前只在 handler 层经 HTTP 间接测到 409。
func TestRetryOrderCurrencyMismatch(t *testing.T) {
	db := model.OpenTestDB(t)
	orders := store.NewOrderStore(db)
	refunds := store.NewRefundStore(db)
	subs := store.NewSubscriptionStore(db)
	chargebacks := store.NewChargebackStore(db)
	preg := provider.NewRegistry()
	preg.Register(fake.New())        // "fake" 结算 USDT
	preg.Register(cnyOnlyProvider{}) // "cny-only" 结算 CNY
	areg := accounts.New([]config.AccountConfig{
		{AccountID: "fake-a1", Channel: "fake", Region: "global", Enabled: true, Weight: 1},
		{AccountID: "cny-a1", Channel: "cny-only", Region: "global", Enabled: true, Weight: 1},
	})
	picker := accounts.NewRouter(areg, nil, nil)
	g := gateway.New(orders, refunds, preg, picker, stubResolver{}, &spyEnqueuer{}, "global", subs, chargebacks)
	ctx := context.Background()

	// 用 cny-only 下单(结算 CNY),再 retry 到 fake(结算 USDT)→ 币种不符。
	res, err := g.CreateOrder(ctx, gateway.CreateOrderInput{SKU: "pro_year", Method: "cny-only"})
	if err != nil {
		t.Fatalf("create: %v", err)
	}

	_, err = g.RetryOrder(ctx, res.OrderNo, "fake", nil)
	if !errors.Is(err, gateway.ErrCurrencyMismatch) {
		t.Fatalf("RetryOrder 换到结算币种不同的渠道应报 ErrCurrencyMismatch, got %v", err)
	}
}