package service

import (
	"fmt"
	"testing"
	"time"

	"github.com/glebarez/sqlite"
	"github.com/stretchr/testify/require"
	"gorm.io/gorm"
	"wails-app/internal/dao"
	"wails-app/internal/global"
)

func setupPaymentServiceTest(t *testing.T) *PaymentService {
	dsn := fmt.Sprintf("file:payment-service-%d?mode=memory&cache=shared", time.Now().UnixNano())
	db, err := gorm.Open(sqlite.Open(dsn), &gorm.Config{})
	require.NoError(t, err)
	sqlDB, err := db.DB()
	require.NoError(t, err)
	sqlDB.SetMaxOpenConns(16)
	t.Cleanup(func() {
		_ = sqlDB.Close()
		if global.GVA_DB == db {
			global.GVA_DB = nil
		}
	})
	global.GVA_DB = db
	require.NoError(t, db.AutoMigrate(&dao.PaymentMethodConfig{}, &dao.PaymentEntryConfig{}, &dao.PaymentEntryMethod{}, &dao.VehicleRecord{}, &dao.PaymentRecord{}))
	require.NoError(t, db.Create(&[]dao.PaymentMethodConfig{
		{Code: PaymentCash, Name: "人工支付", InputMode: InputModeManualAmount, Scenes: []string{SceneCounter}, Enabled: true, Sort: 10, IsSystem: true},
		{Code: PaymentPOS, Name: "POS机支付", InputMode: InputModeConfirm, Scenes: []string{SceneCounter}, Enabled: true, Sort: 20, IsSystem: true},
		{Code: PaymentTicketQR, Name: "小票扫码支付", InputMode: InputModeExternal, Scenes: []string{SceneTicket}, Enabled: true, Sort: 30, IsSystem: true},
	}).Error)
	require.NoError(t, db.Create(&[]dao.PaymentEntryConfig{
		{Code: EntryCounter, Name: "收费岗亭", Enabled: true, IsSystem: true},
		{Code: EntryTicket, Name: "停车小票", Enabled: true, IsSystem: true},
	}).Error)
	require.NoError(t, db.Create(&[]dao.PaymentEntryMethod{
		{EntryCode: EntryCounter, MethodCode: PaymentCash, Sort: 10},
		{EntryCode: EntryCounter, MethodCode: PaymentPOS, Sort: 20},
		{EntryCode: EntryTicket, MethodCode: PaymentCash, Sort: 10},
		{EntryCode: EntryTicket, MethodCode: PaymentPOS, Sort: 20},
		{EntryCode: EntryTicket, MethodCode: PaymentTicketQR, Sort: 30},
	}).Error)
	return NewPaymentService()
}

func TestCashCannotBeDisabledOrDeleted(t *testing.T) {
	svc := setupPaymentServiceTest(t)
	method, err := svc.repo.GetMethodByCode(nil, PaymentCash)
	require.NoError(t, err)

	require.EqualError(t, svc.SetMethodEnabled(method.ID, false), "人工支付是基础功能，不能停用")
	require.EqualError(t, svc.DeleteMethod(method.ID), "系统内置支付方式不能删除")
}

func TestPaymentMethodSceneAndAmountValidation(t *testing.T) {
	svc := setupPaymentServiceTest(t)

	_, _, err := svc.ValidatePayment(nil, PaymentTicketQR, SceneCounter, 10, 10)
	require.EqualError(t, err, "支付方式“小票扫码支付”未配置到当前支付入口")

	_, _, err = svc.ValidatePayment(nil, PaymentCash, SceneCounter, 10, 9.9)
	require.EqualError(t, err, "实收金额不足")

	_, paidAmount, err := svc.ValidatePayment(nil, PaymentPOS, SceneCounter, 10, 999)
	require.NoError(t, err)
	require.Equal(t, 10.0, paidAmount)

	_, paidAmount, err = svc.ValidatePayment(nil, PaymentFree, SceneCounter, 10, 0)
	require.NoError(t, err)
	require.Zero(t, paidAmount)

	_, _, err = svc.ValidatePayment(nil, PaymentFree, SceneTicket, 10, 0)
	require.EqualError(t, err, "免密放行不能用于当前支付场景")
}

func TestDisabledAndInvalidMethodsAreRejected(t *testing.T) {
	svc := setupPaymentServiceTest(t)
	method, err := svc.repo.GetMethodByCode(nil, PaymentPOS)
	require.NoError(t, err)
	require.NoError(t, svc.SetMethodEnabled(method.ID, false))

	_, _, err = svc.ValidatePayment(nil, PaymentPOS, SceneCounter, 10, 10)
	require.EqualError(t, err, "支付方式“POS机支付”已停用")

	err = svc.CreateMethod(&dao.PaymentMethodConfig{Code: "Bad Code", Name: "测试", InputMode: InputModeConfirm, Scenes: []string{SceneCounter}})
	require.ErrorContains(t, err, "支付编码必须")
}

func TestCustomMethodsAreOrderedAndDuplicateCodesRejected(t *testing.T) {
	svc := setupPaymentServiceTest(t)
	custom := &dao.PaymentMethodConfig{
		Code: "bank_card", Name: "银行卡", InputMode: InputModeConfirm,
		EntryCodes: []string{EntryCounter}, Enabled: true, Sort: 5,
	}
	require.NoError(t, svc.CreateMethod(custom))

	methods, err := svc.ListEnabledMethods(SceneCounter)
	require.NoError(t, err)
	require.Equal(t, "bank_card", methods[0].Code)

	duplicate := &dao.PaymentMethodConfig{
		Code: "bank_card", Name: "重复编码", InputMode: InputModeConfirm,
		EntryCodes: []string{EntryCounter}, Enabled: true,
	}
	require.EqualError(t, svc.CreateMethod(duplicate), "支付编码已存在")
}