package change

import (
	"context"
	"strings"

	"git.5iot.com/iotlcm-public/iotlcm-admin-svr/internal/library/batchinput/excel"
	"git.5iot.com/iotlcm-public/iotlcm-admin-svr/internal/model"
)

type ExcelSubmitOptions struct {
	NewPackageCode           string
	DurationMonths           int
	GiftDurationMonths       int
	EffectiveMode            string
	OfflineContractCompleted bool
}

func ExcelTemplateHeaders() []string {
	return []string{
		"ICCID",
		"MSISDN",
		"IMSI",
		"newPackageCode",
		"durationMonths",
		"giftDurationMonths",
		"effectiveMode",
		"offlineContractCompleted",
	}
}

func (o *ExcelSubmitOptions) ToBatchSubmitParam() *model.TSimCardChangeBatchSubmitParam {
	if o == nil {
		return &model.TSimCardChangeBatchSubmitParam{}
	}
	return &model.TSimCardChangeBatchSubmitParam{
		NewPackageCode:           strings.TrimSpace(o.NewPackageCode),
		DurationMonths:           o.DurationMonths,
		GiftDurationMonths:       o.GiftDurationMonths,
		EffectiveMode:            strings.TrimSpace(o.EffectiveMode),
		OfflineContractCompleted: o.OfflineContractCompleted,
	}
}

func (o *ExcelSubmitOptions) ToBatchSubmitParamWithBatchNo(batchNo string) *model.TSimCardChangeBatchSubmitParam {
	param := o.ToBatchSubmitParam()
	param.BatchNo = strings.TrimSpace(batchNo)
	return param
}

func ParseExcelFileRows(ctx context.Context, filePath string) ([]*Row, *ExcelSubmitOptions, error) {
	parsedRows, err := excel.ParseFile(ctx, filePath, excel.ParseOptions{
		RequiredHeaders: ExcelTemplateHeaders(),
		SingleSheet:     true,
	})
	if err != nil {
		return nil, nil, err
	}

	rows := make([]*Row, 0, len(parsedRows))
	var options *ExcelSubmitOptions
	inconsistent := false

	for _, parsed := range parsedRows {
		row := &Row{
			RowNo:  parsed.RowNo,
			Iccid:  excel.Field(parsed, "ICCID"),
			Msisdn: excel.Field(parsed, "MSISDN"),
			Imsi:   excel.Field(parsed, "IMSI"),
			RawFields: map[string]string{
				"ICCID":                    excel.Field(parsed, "ICCID"),
				"MSISDN":                   excel.Field(parsed, "MSISDN"),
				"IMSI":                     excel.Field(parsed, "IMSI"),
				"newPackageCode":           excel.Field(parsed, "newPackageCode"),
				"durationMonths":           excel.Field(parsed, "durationMonths"),
				"giftDurationMonths":       excel.Field(parsed, "giftDurationMonths"),
				"effectiveMode":            excel.Field(parsed, "effectiveMode"),
				"offlineContractCompleted": excel.Field(parsed, "offlineContractCompleted"),
			},
		}
		rowOptions, reasons := parseExcelSubmitOptions(parsed)
		if len(reasons) > 0 {
			row.AddReason(strings.Join(reasons, "; "))
			rows = append(rows, row)
			continue
		}

		row.NewPackageCode = rowOptions.NewPackageCode
		row.DurationMonths = rowOptions.DurationMonths
		row.GiftDurationMonths = rowOptions.GiftDurationMonths
		row.EffectiveMode = rowOptions.EffectiveMode
		row.OfflineContractCompleted = rowOptions.OfflineContractCompleted

		if options == nil {
			options = rowOptions
		} else if !sameExcelSubmitOptions(options, rowOptions) {
			row.AddReason("same excel batch change params must be consistent")
			inconsistent = true
		}
		rows = append(rows, row)
	}

	if inconsistent {
		markRowsWithoutReason(rows, "same excel batch change params must be consistent")
	}
	return rows, options, nil
}

func parseExcelSubmitOptions(row excel.ParsedRow) (*ExcelSubmitOptions, []string) {
	var reasons []string

	newPackageCode := strings.TrimSpace(excel.Field(row, "newPackageCode"))
	if newPackageCode == "" {
		reasons = append(reasons, "newPackageCode is required")
	}
	durationMonths, err := excel.ParsePositiveInt(excel.Field(row, "durationMonths"))
	if err != nil {
		reasons = append(reasons, "durationMonths must be a positive integer")
	}

	giftDurationValue := strings.TrimSpace(excel.Field(row, "giftDurationMonths"))
	giftDurationMonths := 0
	if giftDurationValue != "" {
		giftDurationMonths, err = excel.ParseNonNegativeInt(giftDurationValue)
		if err != nil {
			reasons = append(reasons, "giftDurationMonths must be a non-negative integer")
		}
	}

	effectiveMode := strings.TrimSpace(excel.Field(row, "effectiveMode"))
	if effectiveMode == "" {
		reasons = append(reasons, "effectiveMode is required")
	}

	offlineContractCompleted, err := excel.ParseBool(excel.Field(row, "offlineContractCompleted"))
	if err != nil {
		reasons = append(reasons, "offlineContractCompleted format is invalid")
	} else if !offlineContractCompleted {
		reasons = append(reasons, "offlineContractCompleted must be true")
	}

	if len(reasons) > 0 {
		return nil, reasons
	}

	return &ExcelSubmitOptions{
		NewPackageCode:           newPackageCode,
		DurationMonths:           durationMonths,
		GiftDurationMonths:       giftDurationMonths,
		EffectiveMode:            effectiveMode,
		OfflineContractCompleted: offlineContractCompleted,
	}, nil
}

func sameExcelSubmitOptions(left, right *ExcelSubmitOptions) bool {
	if left == nil || right == nil {
		return false
	}
	return strings.TrimSpace(left.NewPackageCode) == strings.TrimSpace(right.NewPackageCode) &&
		left.DurationMonths == right.DurationMonths &&
		left.GiftDurationMonths == right.GiftDurationMonths &&
		strings.TrimSpace(left.EffectiveMode) == strings.TrimSpace(right.EffectiveMode) &&
		left.OfflineContractCompleted == right.OfflineContractCompleted
}