package order

import (
	"testing"
	"time"

	"hfb_sys/backend/internal/model"
	"hfb_sys/backend/internal/timeutil"

	"gorm.io/datatypes"
)

func TestCalculateCheckoutSettlementRefundsUnusedRent(t *testing.T) {
	order := model.RentalOrder{
		RentAmountCent:      38300,
		OwnerRentAmountCent: 35300,
		DepositAmountCent:   15000,
		AccountSnapshot: datatypes.JSON([]byte(`{
			"haf_coin_amount": 100000000,
			"asset_summary": {
				"price_breakdown": {
					"buyer_coin_base_price": 263,
					"seller_coin_base_price": 233,
					"consumable_price": 120
				}
			}
		}`)),
	}

	settlement := calculateCheckoutSettlement(order, 7, 90, 0)

	// 角精度：243.7 = roundMoney(236.7 + 7)
	if float64(settlement.ActualRentAmountCent)/100 != 243.7 {
		t.Fatalf("ActualRentAmount = %.1f, want 243.7", float64(settlement.ActualRentAmountCent)/100)
	}
	// 角精度：216.7 = roundMoney(209.7 + 7) 卖家币价+消耗品
	if float64(settlement.OwnerRentIncomeCent)/100 != 216.7 {
		t.Fatalf("OwnerRentIncome = %.1f, want 216.7", float64(settlement.OwnerRentIncomeCent)/100)
	}
	// 角精度：27.0 = roundMoney(27) 平台费
	if float64(settlement.PlatformFeeCent)/100 != 27.0 {
		t.Fatalf("PlatformFee = %.1f, want 27.0", float64(settlement.PlatformFeeCent)/100)
	}
	// 角精度：139.3 = roundMoney(383 - 243.7)
	if float64(settlement.RentRefundCent)/100 != 139.3 {
		t.Fatalf("RentRefund = %.1f, want 139.3", float64(settlement.RentRefundCent)/100)
	}
	if float64(settlement.DepositRefundCent)/100 != 150 {
		t.Fatalf("DepositRefund = %.1f, want 150.0", float64(settlement.DepositRefundCent)/100)
	}
	// 角精度：289.3 = roundMoney(139.3 + 150)
	if float64(settlement.RenterRefundCent)/100 != 289.3 {
		t.Fatalf("RenterRefund = %.1f, want 289.3", float64(settlement.RenterRefundCent)/100)
	}
}

func TestCalculateCheckoutSettlementUsesBuyerAndSellerRatiosSeparately(t *testing.T) {
	order := model.RentalOrder{
		RentAmountCent:      38300,
		OwnerRentAmountCent: 35300,
		DepositAmountCent:   15000,
		AccountSnapshot: datatypes.JSON([]byte(`{
			"haf_coin_amount": 100000000,
			"asset_summary": {
				"price_breakdown": {
					"buyer_coin_base_price": 263,
					"seller_coin_base_price": 233,
					"consumable_price": 120
				}
			}
		}`)),
	}

	settlement := calculateCheckoutSettlement(order, 0, 50, 0)

	// 角精度：131.5 = roundMoney(131.5)
	if float64(settlement.ActualRentAmountCent)/100 != 131.5 {
		t.Fatalf("租客侧实际租金 = %.1f, want 131.5", float64(settlement.ActualRentAmountCent)/100)
	}
	// 角精度：116.5 = roundMoney(116.5)
	if float64(settlement.OwnerRentIncomeCent)/100 != 116.5 {
		t.Fatalf("卖家侧租金收入 = %.1f, want 116.5", float64(settlement.OwnerRentIncomeCent)/100)
	}
	// 角精度：15.0 = roundMoney(15)
	if float64(settlement.PlatformFeeCent)/100 != 15.0 {
		t.Fatalf("平台差价 = %.1f, want 15.0", float64(settlement.PlatformFeeCent)/100)
	}
}

func TestCalculateCheckoutSettlementAddsDepositCompensation(t *testing.T) {
	order := model.RentalOrder{
		RentAmountCent:      38300,
		OwnerRentAmountCent: 35300,
		DepositAmountCent:   15000,
		AccountSnapshot: datatypes.JSON([]byte(`{
			"haf_coin_amount": 100000000,
			"asset_summary": {
				"price_breakdown": {
					"buyer_coin_base_price": 263,
					"seller_coin_base_price": 233,
					"consumable_price": 120
				}
			}
		}`)),
	}

	settlement := calculateCheckoutSettlement(order, 120, 100, 30)

	if float64(settlement.ActualRentAmountCent)/100 != 383 {
		t.Fatalf("ActualRentAmount = %.2f, want 383.00", float64(settlement.ActualRentAmountCent)/100)
	}
	if float64(settlement.OwnerRentIncomeCent)/100 != 353 {
		t.Fatalf("OwnerRentIncome = %.2f, want 353.00", float64(settlement.OwnerRentIncomeCent)/100)
	}
	if float64(settlement.DepositCompensationCent)/100 != 30 {
		t.Fatalf("DepositCompensation = %.2f, want 30.00", float64(settlement.DepositCompensationCent)/100)
	}
	if float64(settlement.OwnerIncomeCent)/100 != 383 {
		t.Fatalf("OwnerIncome = %.2f, want 383.00", float64(settlement.OwnerIncomeCent)/100)
	}
	if float64(settlement.RenterRefundCent)/100 != 120 {
		t.Fatalf("RenterRefund = %.2f, want 120.00", float64(settlement.RenterRefundCent)/100)
	}
}

func TestCalculateDepositWaiverUsesSharedRemainingQuota(t *testing.T) {
	paid, waived := calculateDepositWaiver(500, 300, 0)
	if paid != 200 || waived != 300 {
		t.Fatalf("paid = %.1f, waived = %.1f, want 200.0, 300.0", paid, waived)
	}

	paid, waived = calculateDepositWaiver(500, 300, 200)
	if paid != 400 || waived != 100 {
		t.Fatalf("paid = %.1f, waived = %.1f, want 400.0, 100.0", paid, waived)
	}

	paid, waived = calculateDepositWaiver(500, 300, 300)
	if paid != 500 || waived != 0 {
		t.Fatalf("paid = %.1f, waived = %.1f, want 500.0, 0.0", paid, waived)
	}
}

func TestArchiveListingAfterCheckoutMovesListingOffline(t *testing.T) {
	// This test is purely for contract documentation; no behavior is tested yet.
	// When implementing auto-archive behavior:
	// - Call should succeed for renting/overdue/pending_checkout_confirm/pending_checkout_accept orders
	// - Listing status should be set to "archived" or "offline"
	// - In-transaction flag should be cleared
	// - Order should enter completed or closed state
	_ = time.Now()
}

func TestNewOrderNoUsesShanghaiTimeWhenLocalIsUTC(t *testing.T) {
	oldLocal := time.Local
	time.Local = time.UTC
	defer func() {
		time.Local = oldLocal
	}()

	loc := timeutil.ShanghaiLocation()
	before := time.Now().In(loc)
	orderNo, err := newOrderNo()
	after := time.Now().In(loc)
	if err != nil {
		t.Fatalf("newOrderNo() error = %v", err)
	}
	if len(orderNo) != len("RO20260603123456789") {
		t.Fatalf("orderNo length = %d, want %d: %s", len(orderNo), len("RO20260603123456789"), orderNo)
	}
	parsed, err := time.ParseInLocation("20060102150405", orderNo[2:16], loc)
	if err != nil {
		t.Fatalf("parse order no time: %v", err)
	}
	if parsed.Before(before.Add(-2*time.Second)) || parsed.After(after.Add(2*time.Second)) {
		t.Fatalf("order no time = %s, want between %s and %s", parsed, before, after)
	}
}