package outbound

import (
	"context"
	"fmt"
	"io"
	"strconv"
	"strings"

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

	"github.com/gogf/gf/v2/os/gtime"
)

type ExcelParseResult struct {
	Rows        []*Row
	SubmitParam *model.TSimCardOutboundSubmitParam
}

type consistencyValue struct {
	rowNo      int
	normalized string
}

func excelHeaders() []string {
	return []string{
		"ICCID",
		"MSISDN",
		"IMSI",
		"客户/机构",
		"套餐",
		"套餐开始时间",
		"购买时长（年）",
		"赠送时长（月）",
		"订单金额",
		"线下合同/销售/走账已完成",
		"备注",
	}
}

func excelRequiredHeaders() []string {
	return []string{"ICCID"}
}

func ParseExcelFile(ctx context.Context, filePath string) (*ExcelParseResult, error) {
	parsedRows, err := excel.ParseFile(ctx, filePath, excel.ParseOptions{
		RequiredHeaders: excelRequiredHeaders(),
		SingleSheet:     true,
	})
	if err != nil {
		return nil, err
	}
	return buildExcelParseResult(parsedRows), nil
}

func ParseExcelReader(ctx context.Context, reader io.Reader) (*ExcelParseResult, error) {
	parsedRows, err := excel.ParseReader(ctx, reader, excel.ParseOptions{
		RequiredHeaders: excelRequiredHeaders(),
		SingleSheet:     true,
	})
	if err != nil {
		return nil, err
	}
	return buildExcelParseResult(parsedRows), nil
}

func buildExcelParseResult(parsedRows []excel.ParsedRow) *ExcelParseResult {
	rows := make([]*Row, 0, len(parsedRows))
	consistentCustomerAgentId := consistencyValue{}
	consistentPackageCode := consistencyValue{}
	consistentPackageBeginTime := consistencyValue{}
	consistentDurationYears := consistencyValue{}
	consistentDurationMonthPart := consistencyValue{}
	consistentGiftDurationYears := consistencyValue{}
	consistentGiftDurationMonthPart := consistencyValue{}
	consistentAmount := consistencyValue{}
	consistentOfflineContractCompleted := consistencyValue{}
	consistentRemark := consistencyValue{}

	for _, parsed := range parsedRows {
		row := &Row{
			RowNo:  parsed.RowNo,
			Iccid:  excel.Field(parsed, "ICCID"),
			Msisdn: excel.Field(parsed, "MSISDN"),
			Imsi:   excel.Field(parsed, "IMSI"),
			// 出库不再配置测试期、沉默期；1 表示否。
			HasTestPeriod:   1,
			HasSilentPeriod: 1,
		}

		parseRequiredPositiveInt(row, excelField(parsed, "customerAgentId"), "客户/机构", func(value int) {
			row.CustomerAgentId = int64(value)
			checkConsistency(row, "客户/机构", strconv.FormatInt(row.CustomerAgentId, 10), &consistentCustomerAgentId)
		})

		row.PackageCode = strings.TrimSpace(excelField(parsed, "packageCode"))
		if row.PackageCode == "" {
			row.AddReason("套餐不能为空")
		} else {
			checkConsistency(row, "套餐", row.PackageCode, &consistentPackageCode)
		}

		parseRequiredDateTime(row, excelField(parsed, "packageBeginTime"), "套餐开始时间", func(value *gtime.Time) {
			row.PackageBeginTime = value
			checkConsistency(row, "套餐开始时间", formatTime(value), &consistentPackageBeginTime)
		})

		parseExcelDuration(row, parsed, &consistentDurationYears, &consistentDurationMonthPart)

		parseExcelGiftDuration(row, parsed, &consistentGiftDurationYears, &consistentGiftDurationMonthPart)

		parseRequiredAmount(row, excelField(parsed, "amount"), func(value string) {
			row.Amount = value
			checkConsistency(row, "订单金额", value, &consistentAmount)
		})

		parseRequiredBool(row, excelField(parsed, "offlineContractCompleted"), "线下合同/销售/走账已完成", func(value bool) {
			row.OfflineContractCompleted = value
			checkConsistency(row, "线下合同/销售/走账已完成", strconv.FormatBool(value), &consistentOfflineContractCompleted)
		})

		row.Remark = strings.TrimSpace(excelField(parsed, "remark"))
		checkConsistency(row, "备注", row.Remark, &consistentRemark)

		rows = append(rows, row)
	}

	result := &ExcelParseResult{Rows: rows}
	if hasInvalidRows(rows) {
		return result
	}
	result.SubmitParam = &model.TSimCardOutboundSubmitParam{
		CustomerAgentId:          rows[0].CustomerAgentId,
		PackageCode:              rows[0].PackageCode,
		PackageBeginTime:         rows[0].PackageBeginTime,
		DurationYears:            rows[0].DurationYears,
		DurationMonthPart:        rows[0].DurationMonthPart,
		DurationMonths:           rows[0].DurationMonths,
		GiftDurationYears:        rows[0].GiftDurationYears,
		GiftDurationMonthPart:    rows[0].GiftDurationMonthPart,
		GiftDurationMonths:       rows[0].GiftDurationMonths,
		HasTestPeriod:            1,
		HasSilentPeriod:          1,
		Amount:                   rows[0].Amount,
		OfflineContractCompleted: rows[0].OfflineContractCompleted,
		Remark:                   rows[0].Remark,
		BuyerNote:                rows[0].Remark,
		AdminNote:                rows[0].Remark,
	}
	return result
}

func excelField(row excel.ParsedRow, name string) string {
	for _, alias := range excelFieldAliases(name) {
		if value := strings.TrimSpace(excel.Field(row, alias)); value != "" {
			return value
		}
	}
	return ""
}

func excelFieldAliases(name string) []string {
	switch name {
	case "customerAgentId":
		return []string{"客户/机构", "客户/机构ID", "客户ID", "customerAgentId"}
	case "packageCode":
		return []string{"套餐", "套餐编码", "packageCode"}
	case "packageBeginTime":
		return []string{"套餐开始时间", "packageBeginTime"}
	case "durationYears":
		return []string{"购买时长（年）", "套餐购买时长（年）", "durationYears"}
	case "durationMonthPart":
		return []string{"购买时长（月）", "套餐购买时长（月）", "durationMonthPart"}
	case "durationMonths":
		return []string{"durationMonths"}
	case "giftDurationYears":
		return []string{"赠送时长（年）", "giftDurationYears"}
	case "giftDurationMonthPart":
		return []string{"赠送时长（月）", "giftDurationMonthPart"}
	case "giftDurationMonths":
		return []string{"giftDurationMonths"}
	case "amount":
		return []string{"订单金额", "amount"}
	case "offlineContractCompleted":
		return []string{"线下合同/销售/走账已完成", "是否走线下", "offlineContractCompleted"}
	case "remark":
		return []string{"备注", "remark", "buyerNote", "adminNote"}
	default:
		return []string{name}
	}
}

func parseExcelDuration(row *Row, parsed excel.ParsedRow, consistentYears, consistentMonthPart *consistencyValue) {
	yearsRaw := excelField(parsed, "durationYears")
	monthPartRaw := excelField(parsed, "durationMonthPart")
	if strings.TrimSpace(yearsRaw) != "" || strings.TrimSpace(monthPartRaw) != "" {
		parseOptionalNonNegativeInt(row, yearsRaw, "购买时长（年）", 0, func(value int) {
			row.DurationYears = value
			checkConsistency(row, "购买时长（年）", strconv.Itoa(value), consistentYears)
		})
		parseOptionalMonthPart(row, monthPartRaw, "购买时长（月）", func(value int) {
			row.DurationMonthPart = value
			checkConsistency(row, "购买时长（月）", strconv.Itoa(value), consistentMonthPart)
		})
		row.DurationMonths = row.DurationYears*12 + row.DurationMonthPart
		if row.DurationMonths <= 0 {
			row.AddReason("购买时长必须大于0")
		}
		return
	}
	parseRequiredPositiveInt(row, excelField(parsed, "durationMonths"), "套餐购买时长（月）", func(value int) {
		row.DurationMonths = value
		row.DurationYears = value / 12
		row.DurationMonthPart = value % 12
		checkConsistency(row, "套餐购买时长（月）", strconv.Itoa(value), consistentMonthPart)
	})
}

func parseExcelGiftDuration(row *Row, parsed excel.ParsedRow, consistentYears, consistentMonthPart *consistencyValue) {
	yearsRaw := excelField(parsed, "giftDurationYears")
	monthPartRaw := excelField(parsed, "giftDurationMonthPart")
	if strings.TrimSpace(yearsRaw) != "" || strings.TrimSpace(monthPartRaw) != "" {
		parseOptionalNonNegativeInt(row, yearsRaw, "赠送时长（年）", 0, func(value int) {
			row.GiftDurationYears = value
			checkConsistency(row, "赠送时长（年）", strconv.Itoa(value), consistentYears)
		})
		parseOptionalMonthPart(row, monthPartRaw, "赠送时长（月）", func(value int) {
			row.GiftDurationMonthPart = value
			checkConsistency(row, "赠送时长（月）", strconv.Itoa(value), consistentMonthPart)
		})
		row.GiftDurationMonths = row.GiftDurationYears*12 + row.GiftDurationMonthPart
		return
	}
	parseOptionalNonNegativeInt(row, excelField(parsed, "giftDurationMonths"), "赠送时长（月）", 0, func(value int) {
		row.GiftDurationMonths = value
		row.GiftDurationYears = value / 12
		row.GiftDurationMonthPart = value % 12
		checkConsistency(row, "赠送时长（月）", strconv.Itoa(value), consistentMonthPart)
	})
}

func checkConsistency(row *Row, field, normalized string, base *consistencyValue) {
	if row == nil || !row.Valid() {
		return
	}
	if base.rowNo == 0 {
		base.rowNo = row.RowNo
		base.normalized = normalized
		return
	}
	if base.normalized != normalized {
		row.AddReason(fmt.Sprintf("%s与第%d行不一致", field, base.rowNo))
	}
}

func parseRequiredPositiveInt(row *Row, raw, field string, apply func(value int)) {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		row.AddReason(field + "不能为空")
		return
	}
	value, err := excel.ParsePositiveInt(raw)
	if err != nil {
		row.AddReason(field + "格式不正确")
		return
	}
	apply(value)
}

func parseOptionalNonNegativeInt(row *Row, raw, field string, defaultValue int, apply func(value int)) {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		apply(defaultValue)
		return
	}
	value, err := excel.ParseNonNegativeInt(raw)
	if err != nil {
		row.AddReason(field + "格式不正确")
		return
	}
	apply(value)
}

func parseOptionalMonthPart(row *Row, raw, field string, apply func(value int)) {
	parseOptionalNonNegativeInt(row, raw, field, 0, func(value int) {
		if value > 11 {
			row.AddReason(field + "必须在0到11之间")
			return
		}
		apply(value)
	})
}

func parseOptionalAmount(row *Row, raw string, apply func(value string)) {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		apply("")
		return
	}
	value, err := excel.ParseAmount(raw)
	if err != nil {
		row.AddReason("订单金额格式不正确")
		return
	}
	apply(fmt.Sprintf("%.2f", value))
}

func parseRequiredAmount(row *Row, raw string, apply func(value string)) {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		row.AddReason("订单金额不能为空")
		return
	}
	parseOptionalAmount(row, raw, apply)
}

func parseRequiredBool(row *Row, raw, field string, apply func(value bool)) {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		row.AddReason(field + "不能为空")
		return
	}
	value, err := excel.ParseBool(raw)
	if err != nil {
		row.AddReason(field + "格式不正确")
		return
	}
	apply(value)
}

func parseRequiredDateTime(row *Row, raw, field string, apply func(value *gtime.Time)) {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		row.AddReason(field + "不能为空")
		return
	}
	value, err := excel.ParseDateTime(raw)
	if err != nil {
		row.AddReason(field + "格式不正确")
		return
	}
	apply(value)
}