package vehicle

import (
	"fmt"
	"math"
	"testing"
	"time"

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

func setupFeeConfigTest(t *testing.T) *FeeConfigService {
	t.Helper()
	dsn := fmt.Sprintf("file:fee-config-%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)
	t.Cleanup(func() {
		_ = sqlDB.Close()
		if global.GVA_DB == db {
			global.GVA_DB = nil
		}
	})
	global.GVA_DB = db
	require.NoError(t, db.AutoMigrate(&dao.VehicleType{}, &dao.FeeConfig{}))
	require.NoError(t, db.Create(&dao.VehicleType{Name: "临时车", IsSystem: true}).Error)
	return &FeeConfigService{}
}

func validReq() request.FeeConfigCreate {
	return request.FeeConfigCreate{
		VehicleTypeID: 1, StartTime: 15, StartFee: 5,
		UnitTime: 30, UnitFee: 3, DailyMaxFee: 30, VIPDiscount: 1.0,
	}
}

func TestCreateFeeConfigAcceptsValidRules(t *testing.T) {
	svc := setupFeeConfigTest(t)
	require.NoError(t, svc.CreateFeeConfig(validReq()))

	var config dao.FeeConfig
	require.NoError(t, global.GVA_DB.First(&config, "vehicle_type_id = ?", uint(1)).Error)
	require.Equal(t, 30.0, config.DailyMaxFee)
}

func TestCreateFeeConfigRejectsInvalidRules(t *testing.T) {
	svc := setupFeeConfigTest(t)

	cases := []struct {
		name string
		mut  func(*request.FeeConfigCreate)
		want string
	}{
		{"负免费时长", func(r *request.FeeConfigCreate) { r.StartTime = -1 }, "免费时长"},
		{"单位时间为零", func(r *request.FeeConfigCreate) { r.UnitTime = 0 }, "单位时间"},
		{"负起步价", func(r *request.FeeConfigCreate) { r.StartFee = -1 }, "起步价"},
		{"负单位费用", func(r *request.FeeConfigCreate) { r.UnitFee = -1 }, "单位费用"},
		{"负日封顶", func(r *request.FeeConfigCreate) { r.DailyMaxFee = -1 }, "日封顶"},
		{"封顶低于起步价", func(r *request.FeeConfigCreate) { r.DailyMaxFee = 3 }, "日封顶"},
		{"折扣大于1", func(r *request.FeeConfigCreate) { r.VIPDiscount = 1.5 }, "VIP折扣"},
		{"折扣为负", func(r *request.FeeConfigCreate) { r.VIPDiscount = -0.5 }, "VIP折扣"},
		{"折扣为NaN", func(r *request.FeeConfigCreate) { r.VIPDiscount = math.NaN() }, "VIP折扣"},
		{"起步价为NaN", func(r *request.FeeConfigCreate) { r.StartFee = math.NaN() }, "起步价"},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			req := validReq()
			tc.mut(&req)
			err := svc.CreateFeeConfig(req)
			require.Error(t, err)
			require.Contains(t, err.Error(), tc.want)
		})
	}

	// 全部拒绝，未入库
	var count int64
	require.NoError(t, global.GVA_DB.Model(&dao.FeeConfig{}).Count(&count).Error)
	require.Zero(t, count)
}

func TestUpdateFeeConfigRejectsInvalidRules(t *testing.T) {
	svc := setupFeeConfigTest(t)
	require.NoError(t, svc.CreateFeeConfig(validReq()))

	var existing dao.FeeConfig
	require.NoError(t, global.GVA_DB.First(&existing).Error)

	update := request.FeeConfigUpdate{
		ID: existing.ID, VehicleTypeID: 1, StartTime: 15, StartFee: 5,
		UnitTime: 0, UnitFee: 3, DailyMaxFee: 30, VIPDiscount: 1.0,
	}
	require.Error(t, svc.UpdateFeeConfig(update))

	// 原配置未被修改
	var after dao.FeeConfig
	require.NoError(t, global.GVA_DB.First(&after, existing.ID).Error)
	require.Equal(t, 30, after.UnitTime)
}

func TestListFeeConfigsHandlesZeroPage(t *testing.T) {
	svc := setupFeeConfigTest(t)
	require.NoError(t, svc.CreateFeeConfig(validReq()))

	// Page=0 兜底为第 1 页，不产生负 offset
	total, list, err := svc.ListFeeConfigs(request.FeeConfigQuery{Page: 0, PageSize: 0})
	require.NoError(t, err)
	require.Equal(t, int64(1), total)
	require.Len(t, list, 1)
}