package service

import (
	"fmt"
	"strconv"
	"sync"
	"time"
)

const (
	generatedChanKey       = "channel_yd_mock"
	generatedCardType      = "1"
	generatedPackageCode   = "CMIOT-SD-500M-24M-D01"
	generatedSupplierCode  = "SUP_CMCC"
	generatedMonthlyUsage  = 18432.0
	generatedDailyUsage    = 614.4
	generatedPoolUsageByte = 18874368.0
)

type inboundExportColumn struct {
	Header string
	Key    string
}

var inboundExportColumns = []inboundExportColumn{
	{Header: "ICCID*", Key: "ICCID"},
	{Header: "MSISDN*", Key: "MSISDN"},
	{Header: "IMSI*", Key: "IMSI"},
	{Header: "IMEI", Key: "IMEI"},
	{Header: "通道编号*", Key: "chanKey"},
	{Header: "卡类型", Key: "cardType"},
	{Header: "上游套餐编码", Key: "upPkgCode"},
	{Header: "供应商编码", Key: "suppliersCode"},
	{Header: "上游激活时间", Key: "upstreamActivationTime"},
	{Header: "是否贴片转插拔", Key: "insertToPlugEnabled"},
	{Header: "是否运营商达量断网", Key: "carrierTrafficCutoffEnabled"},
	{Header: "协议到期时间", Key: "agreementExpiryDate"},
	{Header: "是否有测试期", Key: "hasTestPeriod"},
	{Header: "测试期天数", Key: "testPeriodDays"},
	{Header: "测试期最晚过期日期", Key: "testPeriodLatestExpiryDate"},
	{Header: "是否有沉默期", Key: "hasSilentPeriod"},
	{Header: "沉默期天数", Key: "silentPeriodDays"},
	{Header: "沉默期最晚过期日期", Key: "silentPeriodLatestExpiryDate"},
}

var inboundExportHeaders = func() []string {
	headers := make([]string, 0, len(inboundExportColumns))
	for _, column := range inboundExportColumns {
		headers = append(headers, column.Header)
	}
	return headers
}()

// 生成序号分配器。
//
// 序号直接来自毫秒时间戳时，同一毫秒内的两次生成会得到完全相同的 seq，
// 进而生成重复的 ICCID/IMSI，触发 mock_t_sim_card 的唯一约束冲突
// （表现为「一键生成」连点两次或两个分组连续生成时报
// UNIQUE constraint failed: mock_t_sim_card.imsi）。
//
// 这里用进程内单调递增的上界保证 seq 严格递增：时间戳只决定起点，
// 真正的唯一性由 nextGeneratedSeq 保证。
var (
	generatedSeqMu   sync.Mutex
	generatedSeqLast int64
)

// nextGeneratedSeq 返回严格大于上一次分配值的序号。
func nextGeneratedSeq(candidate int64) int64 {
	generatedSeqMu.Lock()
	defer generatedSeqMu.Unlock()
	if candidate <= generatedSeqLast {
		candidate = generatedSeqLast + 1
	}
	generatedSeqLast = candidate
	return candidate
}

func GenerateSIMCards(batchTime time.Time, count int) []SIMCard {
	if count <= 0 {
		return []SIMCard{}
	}
	cards := make([]SIMCard, 0, count)
	base := batchTime.UnixMilli()
	dbTime := batchTime.Format("2006-01-02 15:04:05")
	for i := 0; i < count; i++ {
		seq := nextGeneratedSeq(base + int64(i+1))
		card := SIMCard{
			MSISDN:              fmt.Sprintf("141%08d", seq%100000000),
			ICCID:               fmt.Sprintf("898604%014d", seq%100000000000000),
			IMSI:                fmt.Sprintf("46004%010d", seq%10000000000),
			IMEI:                fmt.Sprintf("86%013d", seq%10000000000000),
			Remark:              sourceRemark("CMCC", generatedPackageCode, generatedPackageCode),
			CardStatus:          "2",
			LastChangeDate:      dbTime,
			StopReason:          "000000000000",
			FrozenStatus:        "0",
			FrozenOperTime:      batchTime.Format("20060102150405"),
			OpenDate:            dbTime,
			ActiveDate:          dbTime,
			OnOffStatus:         "1",
			SessionStatus:       "01",
			IP:                  fmt.Sprintf("10.%d.%d.%d", (seq/10000)%255, (seq/100)%255, seq%255),
			IPv6Prefix:          "",
			IPv6:                "",
			RAT:                 "6",
			CardBindStatus:      "1",
			RegionLimitStatus:   "0",
			AreaRestrictType:    "1",
			RestrictedArea:      "110000,310000,440000",
			MonthUsageKB:        generatedMonthlyUsage,
			PoolUsageBytes:      generatedPoolUsageByte,
			DailyBaseKB:         generatedDailyUsage,
			MonthlyBaseKB:       generatedMonthlyUsage,
			GrowthPerMinuteKB:   0,
			LastUsageUpdateTime: batchTime.Format(time.RFC3339),
			APNs: []APN{
				{Name: "CMIOT", Status: "1", UsageBytes: generatedPoolUsageByte, ModifyTime: batchTime.Format("20060102150405"), ServiceUsageState: "1", PCCs: []PCC{{ServiceCode: "default", Name: "APN 缺省流量", PolicyStatus: "2", ServiceUsageState: "1", ModifyTime: batchTime.Format("20060102150405")}}},
			},
		}
		cards = append(cards, card)
	}
	return cards
}

func inboundExportRow(card SIMCard) map[string]string {
	activation := parseCardTime(card.ActiveDate)
	return map[string]string{
		"ICCID":                        card.ICCID,
		"MSISDN":                       card.MSISDN,
		"IMSI":                         card.IMSI,
		"IMEI":                         card.IMEI,
		"chanKey":                      generatedChanKey,
		"cardType":                     generatedCardType,
		"upPkgCode":                    generatedPackageCode,
		"suppliersCode":                generatedSupplierCode,
		"upstreamActivationTime":       activation.Format("2006-01-02 15:04:05"),
		"insertToPlugEnabled":          "true",
		"carrierTrafficCutoffEnabled":  "false",
		"agreementExpiryDate":          activation.AddDate(1, 0, 0).Format("2006-01-02"),
		"hasTestPeriod":                "true",
		"testPeriodDays":               "30",
		"testPeriodLatestExpiryDate":   activation.AddDate(0, 0, 30).Format("2006-01-02"),
		"hasSilentPeriod":              "false",
		"silentPeriodDays":             "",
		"silentPeriodLatestExpiryDate": "",
	}
}

func parseCardTime(value string) time.Time {
	for _, layout := range []string{"2006-01-02 15:04:05", time.RFC3339, time.RFC3339Nano} {
		if t, err := time.ParseInLocation(layout, value, time.Local); err == nil {
			return t
		}
	}
	if unixMilli, err := strconv.ParseInt(value, 10, 64); err == nil {
		return time.UnixMilli(unixMilli)
	}
	return time.Now()
}