package cardflow

import (
	"fmt"
	"strings"

	"git.5iot.com/iotlcm-public/iotlcm-admin-svr/internal/consts"
	"git.5iot.com/iotlcm-public/iotlcm-admin-svr/internal/dao"
)

// MainPackageFlowExpr returns the card's base package flow. When the current
// package table is already joined, pass its table alias to avoid another subquery.
func MainPackageFlowExpr(cardAlias, currentPackageAlias string) string {
	cardColumns := dao.TSimCardInfo.Columns()
	packageColumns := dao.TSimFlowPackageInfo.Columns()
	cardTotalFlow := column(cardAlias, cardColumns.PackageTotalFlowMb)

	currentPackageAlias = strings.TrimSpace(currentPackageAlias)
	if currentPackageAlias != "" {
		return fmt.Sprintf(
			"COALESCE(NULLIF(%s, 0), %s, 0)",
			column(currentPackageAlias, packageColumns.FlowMb),
			cardTotalFlow,
		)
	}

	packageTable := dao.TSimFlowPackageInfo.Table()
	packageAlias := "card_base_pkg"
	return fmt.Sprintf(
		"COALESCE(NULLIF((SELECT %s.%s FROM %s AS %s WHERE %s.%s = %s AND %s.%s = %s LIMIT 1), 0), %s, 0)",
		packageAlias,
		packageColumns.FlowMb,
		packageTable,
		packageAlias,
		packageAlias,
		packageColumns.PackageCode,
		column(cardAlias, cardColumns.CurrentPackageCode),
		packageAlias,
		packageColumns.TenantId,
		column(cardAlias, cardColumns.TenantId),
		cardTotalFlow,
	)
}

// ActiveCardTopupFlowExpr returns active, unexpired single-card add-package flow.
func ActiveCardTopupFlowExpr(cardAlias string) string {
	cardColumns := dao.TSimCardInfo.Columns()
	bindTable := dao.TSimCardBindPkg.Table()
	bindColumns := dao.TSimCardBindPkg.Columns()
	packageTable := dao.TSimFlowPackageInfo.Table()
	packageColumns := dao.TSimFlowPackageInfo.Columns()
	bindAlias := "card_topup_bind"
	packageAlias := "card_topup_pkg"

	return fmt.Sprintf(
		"IFNULL((SELECT SUM(IFNULL(%s.%s, 0)) FROM %s AS %s LEFT JOIN %s AS %s ON %s.%s = %s.%s AND %s.%s = %s.%s WHERE %s.%s = %s AND %s.%s = %s AND %s.%s = %d AND %s.%s = %d AND (%s.%s IS NULL OR %s.%s <= NOW()) AND (%s.%s IS NULL OR %s.%s > NOW())), 0)",
		packageAlias,
		packageColumns.FlowMb,
		bindTable,
		bindAlias,
		packageTable,
		packageAlias,
		bindAlias,
		bindColumns.PackageCode,
		packageAlias,
		packageColumns.PackageCode,
		bindAlias,
		bindColumns.TenantId,
		packageAlias,
		packageColumns.TenantId,
		bindAlias,
		bindColumns.Iccid,
		column(cardAlias, cardColumns.Iccid),
		bindAlias,
		bindColumns.TenantId,
		column(cardAlias, cardColumns.TenantId),
		bindAlias,
		bindColumns.PackageType,
		consts.PackageTypeCardAddPackage,
		bindAlias,
		bindColumns.EffectiveStatus,
		consts.EffectiveStatusEffective,
		bindAlias,
		bindColumns.EffectiveTime,
		bindAlias,
		bindColumns.EffectiveTime,
		bindAlias,
		bindColumns.ExpectedExpireTime,
		bindAlias,
		bindColumns.ExpectedExpireTime,
	)
}

func TotalFlowExpr(cardAlias, currentPackageAlias string) string {
	return fmt.Sprintf(
		"(%s + %s)",
		MainPackageFlowExpr(cardAlias, currentPackageAlias),
		ActiveCardTopupFlowExpr(cardAlias),
	)
}

func RemainFlowExpr(cardAlias, currentPackageAlias string) string {
	return fmt.Sprintf(
		"GREATEST(%s - IFNULL(%s, 0), 0)",
		TotalFlowExpr(cardAlias, currentPackageAlias),
		column(cardAlias, dao.TSimCardInfo.Columns().UsedFlowMb),
	)
}

func ExhaustedCondition(cardAlias, currentPackageAlias string) string {
	return fmt.Sprintf(
		"%s <= IFNULL(%s, 0)",
		TotalFlowExpr(cardAlias, currentPackageAlias),
		column(cardAlias, dao.TSimCardInfo.Columns().UsedFlowMb),
	)
}

func column(alias, name string) string {
	alias = strings.TrimSpace(alias)
	if alias == "" {
		return name
	}
	return alias + "." + name
}