package utils

import (
	"errors"
	"math"
	"reflect"
	"strconv"
	"strings"
	"time"

	timeconv "github.com/Andrew-M-C/go.timeconv"
	"github.com/beego/beego/v2/core/validation"
	"gitlab.fjmaimaimai.com/allied-creation/performance/pkg/domain"
)

// ValidateCommand 验证输入参数
func ValidateCommand(commandType interface{}) error {
	valid := validation.Validation{}
	b, err := valid.Valid(commandType)
	if err != nil {
		return err
	}
	if !b {
		elem := reflect.TypeOf(commandType).Elem()
		for _, validErr := range valid.Errors {
			field, isExist := elem.FieldByName(validErr.Field)
			if isExist {
				if tag := field.Tag.Get("cname"); len(tag) > 0 {
					return errors.New(strings.Replace(validErr.Message, validErr.Field, tag, -1))
				} else {
					return errors.New(validErr.Message)
				}
			} else {
				return errors.New(validErr.Message)
			}
		}
	}
	return nil
}

// FormatFloatDecimal 格式化小数点位数
func FormatFloatDecimal(num float64, decimal int) string {
	d := float64(1)
	if decimal > 0 {
		d = math.Pow10(decimal) // 10的N次方
	}
	// math.trunc作用就是返回浮点数的整数部分
	return strconv.FormatFloat(math.Trunc(num*d)/d, 'f', -1, 64)
}

// NextTime 0点时刻为标准计算
func NextTime(now0 time.Time, start time.Time, kpiCycle int) time.Time {
	year, month, day := start.Date()
	// 起始时间0点时刻
	start0 := time.Date(year, month, day, 0, 0, 0, 0, time.Local)

	var nextTime time.Time
	switch kpiCycle {
	case domain.KpiCycleDay:
		nextTime = now0 // 当前时间的0点开始发送
		break
	case domain.KpiCycleWeek:
		offsetSeconds := int64(now0.Sub(start0).Seconds())
		offsetDay := offsetSeconds / (24 * 60 * 60)
		cycleCount := int(offsetDay)/7 + 1
		nextTime = timeconv.AddDate(start0, 0, 0, cycleCount*7)
		break
	case domain.KpiCycleOneMonth:
		offsetMonth := SubMonth(now0, start0)
		nextTime = timeconv.AddDate(start0, 0, offsetMonth, 0)
		if nextTime.Before(now0) {
			nextTime = timeconv.AddDate(nextTime, 0, 1, 0)
		}
		break
	case domain.KpiCycleTwoMonth:
		offsetMonth := SubMonth(now0, start0)
		multiple := float64(offsetMonth) / 2
		if multiple == 0 {
			multiple = 1
		} else {
			multiple = math.Ceil(multiple)
		}
		nextTime = timeconv.AddDate(start0, 0, int(multiple)*2, 0)
		if nextTime.Before(now0) {
			nextTime = timeconv.AddDate(nextTime, 0, 2, 0)
		}
		break
	case domain.KpiCycleThreeMonth:
		offsetMonth := SubMonth(now0, start0)
		multiple := float64(offsetMonth) / 3
		if multiple == 0 {
			multiple = 1
		} else {
			multiple = math.Ceil(multiple)
		}
		nextTime = timeconv.AddDate(start0, 0, int(multiple)*3, 0)
		if nextTime.Before(now0) {
			nextTime = timeconv.AddDate(nextTime, 0, 3, 0)
		}
		break
	case domain.KpiCycleSixMonth:
		offsetMonth := SubMonth(now0, start0)
		multiple := float64(offsetMonth) / 6
		if multiple == 0 {
			multiple = 1
		} else {
			multiple = math.Ceil(multiple)
		}
		nextTime = timeconv.AddDate(start0, 0, int(multiple)*6, 0)
		if nextTime.Before(now0) {
			nextTime = timeconv.AddDate(nextTime, 0, 6, 0)
		}
		break
	case domain.KpiCycleYear:
		offsetMonth := SubMonth(now0, start0)
		multiple := float64(offsetMonth) / 12
		if multiple == 0 {
			multiple = 1
		} else {
			multiple = math.Ceil(multiple)
		}
		nextTime = timeconv.AddDate(start0, 0, int(multiple)*12, 0)
		if nextTime.Before(now0) {
			nextTime = timeconv.AddDate(nextTime, 0, 12, 0)
		}
		break
	}
	return nextTime
}

// SubMonth 计算日期相差多少月
func SubMonth(t1, t2 time.Time) (month int) {
	y1 := t1.Year()
	y2 := t2.Year()
	m1 := int(t1.Month())
	m2 := int(t2.Month())
	d1 := t1.Day()
	d2 := t2.Day()

	yearInterval := y1 - y2
	// 如果 d1的 月-日 小于 d2的 月-日 那么 yearInterval-- 这样就得到了相差的年数
	if m1 < m2 || (m1 == m2 && d1 < d2) {
		yearInterval--
	}
	// 获取月数差值
	monthInterval := (m1 + 12) - m2
	if d1 < d2 {
		monthInterval--
	}
	monthInterval %= 12
	month = yearInterval*12 + monthInterval
	return
}

// NextTimeInc 0点时刻为标准计算
func NextTimeInc(start time.Time, kpiCycle int) time.Time {
	year, month, day := start.Date()
	// 起始时间0点时刻
	start0 := time.Date(year, month, day, 0, 0, 0, 0, time.Local)

	var nextTime time.Time
	switch kpiCycle {
	case domain.KpiCycleDay:
		nextTime = timeconv.AddDate(start0, 0, 0, 1) // 当前时间的下一天开始发送
		break
	case domain.KpiCycleWeek:
		nextTime = timeconv.AddDate(start0, 0, 0, 7)
		break
	case domain.KpiCycleOneMonth:
		nextTime = timeconv.AddDate(start0, 0, 1, 0)
		break
	case domain.KpiCycleTwoMonth:
		nextTime = timeconv.AddDate(start0, 0, 2, 0)
		break
	case domain.KpiCycleThreeMonth:
		nextTime = timeconv.AddDate(start0, 0, 3, 0)
		break
	case domain.KpiCycleSixMonth:
		nextTime = timeconv.AddDate(start0, 0, 6, 0)
		break
	case domain.KpiCycleYear:
		nextTime = timeconv.AddDate(start0, 1, 0, 0)
		break
	}
	return nextTime
}