package query

import (
	"context"
	"strings"

	"github.com/gogf/gf/v2/errors/gerror"
	"git.5iot.com/iotlcm-public/iotlcm-openapi/internal/dao"
	"git.5iot.com/iotlcm-public/iotlcm-openapi/internal/model"
	"git.5iot.com/iotlcm-public/iotlcm-openapi/internal/model/entity"
	"git.5iot.com/iotlcm-public/iotlcm-openapi/internal/service"
)

const queryTrafficCutoffConfigMaxCards = 1000

type trafficCutoffIdentifier struct {
	Msisdn string
	Iccid  string
	Imsi   string
}

func validateTrafficCutoffIdentifier(item trafficCutoffIdentifier) error {
	count := 0
	if item.Msisdn != "" {
		count++
	}
	if item.Iccid != "" {
		count++
	}
	if item.Imsi != "" {
		count++
	}
	if count == 0 {
		return gerror.New("msisdn、iccid、imsi至少传一个")
	}
	return nil
}

func trafficCutoffIdentifierKey(item trafficCutoffIdentifier) string {
	if item.Iccid != "" {
		return "iccid:" + item.Iccid
	}
	if item.Msisdn != "" {
		return "msisdn:" + item.Msisdn
	}
	return "imsi:" + item.Imsi
}

func trafficCutoffCardMatchesIdentifier(card *entity.TSimCardInfo, identifier trafficCutoffIdentifier) bool {
	if card == nil {
		return false
	}
	if identifier.Iccid != "" && strings.TrimSpace(card.Iccid) != identifier.Iccid {
		return false
	}
	if identifier.Msisdn != "" && strings.TrimSpace(card.Msisdn) != identifier.Msisdn {
		return false
	}
	if identifier.Imsi != "" && strings.TrimSpace(card.Imsi) != identifier.Imsi {
		return false
	}
	return true
}

func (s *sQuerySim) QueryTrafficCutoffConfig(ctx context.Context, in *model.QueryTrafficCutoffConfigParam) (*model.QueryTrafficCutoffConfigOutput, error) {
	if in == nil {
		return nil, gerror.New("查询参数不能为空")
	}
	if strings.TrimSpace(in.AppId) == "" {
		return nil, gerror.New("appId不能为空")
	}
	if len(in.Cards) == 0 {
		return nil, gerror.New("查询卡不能为空")
	}
	if len(in.Cards) > queryTrafficCutoffConfigMaxCards {
		return nil, gerror.Newf("单次最多查询%d张卡", queryTrafficCutoffConfigMaxCards)
	}

	identifiers := make([]trafficCutoffIdentifier, 0, len(in.Cards))
	seen := make(map[string]struct{}, len(in.Cards))
	for _, item := range in.Cards {
		identifier := trafficCutoffIdentifier{Msisdn: strings.TrimSpace(item.Msisdn), Iccid: strings.TrimSpace(item.Iccid), Imsi: strings.TrimSpace(item.Imsi)}
		if err := validateTrafficCutoffIdentifier(identifier); err != nil {
			return nil, err
		}
		key := trafficCutoffIdentifierKey(identifier)
		if _, ok := seen[key]; ok {
			return nil, gerror.Newf("卡片标识重复：%s", key)
		}
		seen[key] = struct{}{}
		identifiers = append(identifiers, identifier)
	}

	cardMap, err := loadTrafficCutoffCards(ctx, identifiers)
	if err != nil {
		return nil, err
	}
	output := &model.QueryTrafficCutoffConfigOutput{Total: len(identifiers), Items: make([]model.QueryTrafficCutoffConfigItem, 0, len(identifiers))}
	for _, identifier := range identifiers {
		result := model.QueryTrafficCutoffConfigItem{}
		card := cardMap[trafficCutoffIdentifierKey(identifier)]
		if !trafficCutoffCardMatchesIdentifier(card, identifier) {
			result.ErrorCode = "CARD_NOT_FOUND"
			result.ErrorMessage = "卡片不存在或无权限"
			output.NotFoundCount++
			output.Items = append(output.Items, result)
			continue
		}
		result.Matched = true
		result.Iccid = strings.TrimSpace(card.Iccid)
		result.TrafficCutoffStatus = card.TrafficCutoffStatus
		result.TrafficCutoffStatusName = trafficCutoffStatusName(card.TrafficCutoffStatus)
		result.TrafficCutoffThreshold = card.TrafficCutoffThreshold
		if result.TrafficCutoffStatus == 0 {
			result.TrafficCutoffThreshold = 0
		}
		result.TrafficCutoffThresholdUnit = "MB"
		if in.IncludeUsage {
			packageTotalFlowMb := card.PackageTotalFlowMb
			usedFlowMb := card.UsedFlowMb
			remainingFlowMb := maxFloat(packageTotalFlowMb-usedFlowMb, 0)
			result.PackageTotalFlowMb = &packageTotalFlowMb
			result.UsedFlowMb = &usedFlowMb
			result.RemainingFlowMb = &remainingFlowMb
		}
		output.MatchedCount++
		output.Items = append(output.Items, result)
	}
	return output, nil
}

func loadTrafficCutoffCards(ctx context.Context, identifiers []trafficCutoffIdentifier) (map[string]*entity.TSimCardInfo, error) {
	columns := dao.TSimCardInfo.Columns()
	result := make(map[string]*entity.TSimCardInfo, len(identifiers))
	lookup := func(field string, values []string) error {
		if len(values) == 0 {
			return nil
		}
		var cards []*entity.TSimCardInfo
		err := service.IotTSimCardInfo().Model(ctx).
			Fields(columns.Iccid, columns.Msisdn, columns.Imsi, columns.PackageTotalFlowMb, columns.UsedFlowMb, columns.TrafficCutoffStatus, columns.TrafficCutoffThreshold).
			WhereIn(field, values).Scan(&cards)
		if err != nil {
			return gerror.Wrap(err, "查询达量断网配置失败")
		}
		for _, card := range cards {
			if card == nil {
				continue
			}
			if card.Iccid != "" {
				result["iccid:"+strings.TrimSpace(card.Iccid)] = card
			}
			if card.Msisdn != "" {
				result["msisdn:"+strings.TrimSpace(card.Msisdn)] = card
			}
			if card.Imsi != "" {
				result["imsi:"+strings.TrimSpace(card.Imsi)] = card
			}
		}
		return nil
	}
	iccidValues, msisdnValues, imsiValues := make([]string, 0), make([]string, 0), make([]string, 0)
	for _, item := range identifiers {
		switch {
		case item.Iccid != "":
			iccidValues = append(iccidValues, item.Iccid)
		case item.Msisdn != "":
			msisdnValues = append(msisdnValues, item.Msisdn)
		default:
			imsiValues = append(imsiValues, item.Imsi)
		}
	}
	if err := lookup(columns.Iccid, iccidValues); err != nil {
		return nil, err
	}
	if err := lookup(columns.Msisdn, msisdnValues); err != nil {
		return nil, err
	}
	if err := lookup(columns.Imsi, imsiValues); err != nil {
		return nil, err
	}
	return result, nil
}

func trafficCutoffStatusName(status int) string {
	switch status {
	case 1:
		return "已开启"
	case 2:
		return "已关闭"
	default:
		return "删除"
	}
}

func maxFloat(value, floor float64) float64 {
	if value < floor {
		return floor
	}
	return value
}