package upstreamimpl

import (
	"context"
	"fmt"
	"git.5iot.com/iotlcm-public/iotlcm-upstream-chan/internal/model"
	"strings"
	"time"
)

const dxV3BatchLimit = 100

// dxV3BatchMonthAvailable 电信 v3 月批量接口仅支持最近六个含当月的月份。
func dxV3BatchMonthAvailable(month time.Time) bool {
	now := time.Now().In(dxBatchLocation)
	current := time.Date(now.Year(), now.Month(), 1, 0, 0, 0, 0, dxBatchLocation)
	return !month.Before(current.AddDate(0, -5, 0)) && !month.After(current)
}

func dxV3Batch[T any](ctx context.Context, s *sSimDXV3, keys []*model.SimKey, path, listName, dateName, date string,
	convert func(map[string]any) (T, error)) []*model.SimBaseRes[T] {
	output := make([]*model.SimBaseRes[T], len(keys))
	pending := make([]int, 0, len(keys))
	for index, key := range keys {
		if key == nil || strings.TrimSpace(key.MSISDN) == "" {
			output[index] = dxV3Failure[T](key, fmt.Errorf("telecom v3 batch requires msisdn"))
			continue
		}
		pending = append(pending, index)
	}
	for offset := 0; offset < len(pending); offset += dxV3BatchLimit {
		end := offset + dxV3BatchLimit
		if end > len(pending) {
			end = len(pending)
		}
		chunk := pending[offset:end]
		msisdns := make([]string, 0, len(chunk))
		for _, index := range chunk {
			msisdns = append(msisdns, strings.TrimSpace(keys[index].MSISDN))
		}
		body := map[string]any{"msisdnList": msisdns, "custNbr": s.custNbr}
		if dateName != "" {
			body[dateName] = date
		}
		var err error
		var result map[string]any
		if s.custNbr == "" {
			err = fmt.Errorf("telecom v3 custNbr not configured")
		} else {
			result, err = s.request(ctx, path, nil, body)
		}
		byNumber := make(map[string]map[string]any)
		if err == nil {
			list, ok := result[listName].([]any)
			if !ok {
				err = fmt.Errorf("telecom v3 result is missing %s", listName)
			} else {
				for _, entry := range list {
					item, ok := entry.(map[string]any)
					if !ok {
						err = fmt.Errorf("invalid telecom v3 batch entry")
						break
					}
					number := dxV3String(item, "msisdn")
					if number == "" {
						err = fmt.Errorf("telecom v3 batch entry is missing msisdn")
						break
					}
					if _, duplicate := byNumber[number]; duplicate {
						err = fmt.Errorf("duplicate telecom v3 batch result for msisdn")
						break
					}
					byNumber[number] = item
				}
			}
		}
		for _, index := range chunk {
			key := keys[index]
			itemErr := err
			item := byNumber[strings.TrimSpace(key.MSISDN)]
			if itemErr == nil && item == nil {
				itemErr = fmt.Errorf("telecom v3 batch omitted requested card")
			}
			if itemErr == nil {
				code := dxV3String(item, "result")
				if code == "" {
					itemErr = fmt.Errorf("telecom v3 batch entry is missing result")
				} else if code != "0" {
					itemErr = &dxV3Error{code: code, message: firstNonEmpty(dxV3String(item, "resultDesc"), "telecom v3 card query failed")}
				}
			}
			var value T
			if itemErr == nil && dateName != "" && dxV3String(item, dateName) != date {
				itemErr = fmt.Errorf("telecom v3 batch returned a different query period")
			}
			if itemErr == nil {
				value, itemErr = convert(item)
			}
			if itemErr != nil {
				output[index] = dxV3Failure[T](key, itemErr)
			} else {
				output[index] = &model.SimBaseRes[T]{SimKey: key, ResData: value}
			}
		}
	}
	return output
}

func (s *sSimDXV3) QuerySimCardStatusBatch(ctx context.Context, input *model.SimCardStatusInput) (model.SimCardStatusOutput, error) {
	if input == nil {
		return model.SimCardStatusOutput{}, nil
	}
	return dxV3Batch(ctx, s, input.SimKeys, "getSimStatusBatch", "simStatusList", "", "", dxV3Status), nil
}

func (s *sSimDXV3) QuerySimDataUsageMonthlyBatch(ctx context.Context, input *model.SimDataUsageMonthlyInput) (model.SimDataUsageMonthlyOutput, error) {
	if input == nil {
		return model.SimDataUsageMonthlyOutput{}, nil
	}
	month, err := time.ParseInLocation("200601", input.ReqData.QueryDate, dxBatchLocation)
	if err != nil {
		return nil, fmt.Errorf("invalid queryDate: expected yyyyMM")
	}
	if !dxV3BatchMonthAvailable(month) {
		return nil, fmt.Errorf("telecom v3 monthly batch supports the latest six months")
	}
	return dxV3Batch(ctx, s, input.SimKeys, "getDataUsageByMonthBatch", "batchTrafficList", "month", input.ReqData.QueryDate,
		func(item map[string]any) (model.SimDataUsageMonthlyOutputItem, error) {
			amount, err := dxV3Amount(item)
			return model.SimDataUsageMonthlyOutputItem{DataAmount: amount}, err
		}), nil
}

func (s *sSimDXV3) QuerySimDataUsageDailyBatch(ctx context.Context, input *model.SimDataUsageDailyInput) (model.SimDataUsageDailyOutput, error) {
	if input == nil {
		return model.SimDataUsageDailyOutput{}, nil
	}
	if !dxBatchDayAvailable(input.ReqData.QueryDate, time.Now()) {
		return nil, fmt.Errorf("telecom v3 daily batch requires a completed day within the latest seven days")
	}
	return dxV3Batch(ctx, s, input.SimKeys, "getDataUsageByDayBatch", "batchTrafficList", "date", input.ReqData.QueryDate,
		func(item map[string]any) (model.SimDataUsageDailyOutputItem, error) {
			amount, err := dxV3Amount(item)
			return model.SimDataUsageDailyOutputItem{QueryDate: input.ReqData.QueryDate, DataAmount: amount}, err
		}), nil
}

var _ model.SimCardBatchQueryI = (*sSimDXV3)(nil)