package distribution

import (
	"testing"
	"time"

	"hfb_sys/backend/internal/model"
)

func TestResolveOrderSourceTx(t *testing.T) {
	db := distributionTestDB(t)

	// 空 siteCode 正常返回 nil
	site, rule, err := ResolveOrderSourceTx(db, "", 1, 1, time.Now())
	if err != nil || site != nil || rule != nil {
		t.Fatalf("expected nil for empty siteCode, got site=%v, rule=%v, err=%v", site, rule, err)
	}

	// 站点不存在
	_, _, err = ResolveOrderSourceTx(db, "unknown_site", 1, 1, time.Now())
	if err != ErrSiteNotFound {
		t.Fatalf("expected ErrSiteNotFound, got %v", err)
	}

	// 创建正常站点
	now := time.Now()
	activeSite := model.DistributionSite{
		SiteCode:               "site_test",
		SiteName:               "测试分销站",
		Domain:                 "test.dist.com",
		Status:                 "active",
		DisplayAccountEnabled: true,
	}
	if err := db.Create(&activeSite).Error; err != nil {
		t.Fatal(err)
	}

	// 账号展示关系不存在
	_, _, err = ResolveOrderSourceTx(db, "site_test", 10, 20, now)
	if err != ErrAccountDisplayNotFound {
		t.Fatalf("expected ErrAccountDisplayNotFound, got %v", err)
	}

	// 创建展示关系
	accountDisplay := model.DistributionSiteAccount{
		SiteID:        activeSite.ID,
		AccountID:     20,
		ListingID:     10,
		DisplayStatus: "enabled",
	}
	if err := db.Create(&accountDisplay).Error; err != nil {
		t.Fatal(err)
	}

	// 规则不存在
	_, _, err = ResolveOrderSourceTx(db, "site_test", 10, 20, now)
	if err != ErrRuleNotFound {
		t.Fatalf("expected ErrRuleNotFound, got %v", err)
	}

	// 创建有效规则
	ruleVersion := model.DistributionRuleVersion{
		SiteID:                  &activeSite.ID,
		Mode:                    ModeTwoPartyDistributorReceive,
		Version:                 1,
		Status:                  "active",
		DistributorReceiveRatio: 3.5,
		PlatformSellRatio:       4.0,
		ServiceFeeValue:         2.5,
		ServiceFeeUnit:          ServiceFeeUnitFixedAmount,
		PaymentFeeBPS:           50,
		EffectiveFrom:           now.Add(-1 * time.Hour),
	}
	if err := db.Create(&ruleVersion).Error; err != nil {
		t.Fatal(err)
	}

	// 正常解析
	foundSite, foundRule, err := ResolveOrderSourceTx(db, "site_test", 10, 20, now)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}
	if foundSite.ID != activeSite.ID || foundRule.ID != ruleVersion.ID {
		t.Fatalf("unexpected result: site=%v, rule=%v", foundSite, foundRule)
	}
}

func TestSnapshotPaidOrderTxAndApplyRefundTx(t *testing.T) {
	db := distributionTestDB(t)

	now := time.Now()
	site := model.DistributionSite{
		SiteCode:               "site_pay",
		SiteName:               "支付测试站",
		Domain:                 "pay.dist.com",
		Status:                 "active",
		DisplayAccountEnabled: true,
		TaxEnabled:             true,
		TaxRateBPS:             100,
	}
	if err := db.Create(&site).Error; err != nil {
		t.Fatal(err)
	}

	rule := model.DistributionRuleVersion{
		SiteID:                  &site.ID,
		Mode:                    ModeTwoPartyDistributorReceive,
		Version:                 1,
		Status:                  "active",
		DistributorReceiveRatio: 3.5,
		PlatformSellRatio:       4.0,
		ServiceFeeValue:         2.5,
		ServiceFeeUnit:          ServiceFeeUnitFixedAmount,
		PaymentFeeBPS:           50,
		TaxEnabled:              true,
		TaxRateBPS:              100,
		EffectiveFrom:           now.Add(-1 * time.Hour),
	}
	if err := db.Create(&rule).Error; err != nil {
		t.Fatal(err)
	}

	order := model.RentalOrder{
		OrderNo:                   "ORD-DIST-1",
		ListingID:                 101,
		AccountID:                 201,
		OwnerID:                   1,
		RenterID:                  2,
		Status:                    "renting",
		PlatformFeeCent:           300,
		DistributionSiteID:        &site.ID,
		DistributionRuleVersionID: &rule.ID,
	}
	if err := db.Create(&order).Error; err != nil {
		t.Fatal(err)
	}

	// 1. SnapshotPaidOrderTx
	grossPaid := int64(10000)
	if err := SnapshotPaidOrderTx(db, order.ID, grossPaid); err != nil {
		t.Fatalf("SnapshotPaidOrderTx failed: %v", err)
	}

	var financial model.DistributionOrderFinancial
	if err := db.Where("order_id = ?", order.ID).First(&financial).Error; err != nil {
		t.Fatalf("find financial failed: %v", err)
	}
	if financial.GrossPaidAmountCent != grossPaid || financial.SiteID != site.ID {
		t.Fatalf("unexpected financial snapshot: %+v", financial)
	}

	var parties []model.DistributionOrderParty
	if err := db.Where("order_id = ?", order.ID).Find(&parties).Error; err != nil || len(parties) != 2 {
		t.Fatalf("unexpected parties count: len=%d, err=%v", len(parties), err)
	}

	// 幂等写入测试：重复调用不报错且不重复追加 party
	if err := SnapshotPaidOrderTx(db, order.ID, grossPaid); err != nil {
		t.Fatalf("idempotent SnapshotPaidOrderTx failed: %v", err)
	}
	var partiesAfter []model.DistributionOrderParty
	if err := db.Where("order_id = ?", order.ID).Find(&partiesAfter).Error; err != nil || len(partiesAfter) != 2 {
		t.Fatalf("idempotency broken: len=%d", len(partiesAfter))
	}

	// 2. ApplyRefundTx
	// 非法金额
	if err := ApplyRefundTx(db, order.ID, -10); err != ErrInvalidAmount {
		t.Fatalf("expected ErrInvalidAmount for negative refund, got %v", err)
	}
	if err := ApplyRefundTx(db, order.ID, grossPaid+100); err != ErrInvalidAmount {
		t.Fatalf("expected ErrInvalidAmount for excessive refund, got %v", err)
	}

	// 合法退款
	refundAmount := int64(2000)
	if err := ApplyRefundTx(db, order.ID, refundAmount); err != nil {
		t.Fatalf("ApplyRefundTx failed: %v", err)
	}

	var updatedFinancial model.DistributionOrderFinancial
	if err := db.Where("order_id = ?", order.ID).First(&updatedFinancial).Error; err != nil {
		t.Fatalf("find updated financial failed: %v", err)
	}
	if updatedFinancial.RefundAmountCent != refundAmount {
		t.Fatalf("expected refund amount %d, got %d", refundAmount, updatedFinancial.RefundAmountCent)
	}
	if updatedFinancial.NetPaidAmountCent != grossPaid-refundAmount {
		t.Fatalf("expected net paid %d, got %d", grossPaid-refundAmount, updatedFinancial.NetPaidAmountCent)
	}
}