<?php

class erpCustomerMapper
{
    public static function map($payload)
    {
        $action = strtoupper(trim($payload['action'] ?? ''));
        if ($action === 'UPDATED') {
            return self::mapPatch($payload);
        }

        return self::mapFull($payload);
    }

    public static function mapFull($payload)
    {
        $after = $payload['after'] ?? [];

        $mapped = [];

        foreach (self::fieldMap() as $misField => $cfg) {

            $dtoField = $cfg['dto'];

            $mapped[$dtoField] = self::transformValue(
                $after[$misField] ?? null,
                $cfg['type']
            );
        }

        // audit
        $mapped['cusSourceType'] = 'MIS';


        return $mapped;
    }

    private static function mapPatch($payload)
    {
        $before = $payload['before'] ?? [];
        $after = $payload['after'] ?? [];

        $patch = [];

        foreach (self::fieldMap() as $misField => $cfg) {

            $beforeVal = $before[$misField] ?? null;
            $afterVal = $after[$misField] ?? null;

            if (!self::isDifferent($beforeVal, $afterVal)) {
                continue;
            }

            $patch[$cfg['dto']] = self::transformValue(
                $afterVal,
                $cfg['type']
            );
        }

        // NO CHANGE
        if (count($patch) <= 0) {
            return null;
        }

        // REQUIRED
        $patch['cusSourceType'] = 'MIS';
        $patch['cusNo'] = $after['c_accountno'] ?? null;
        $patch['cusExternalUpdatedBy'] = $after['c_updatedby'] ?? null;

        return $patch;
    }

    // FIELD MAP
    private static function fieldMap(): array
    {
        return [
            'c_accountno'           => ['dto' => 'cusNo'                    , 'type' => 'string'],
            'c_name'                => ['dto' => 'cusName'                  , 'type' => 'string'],
            'c_status'              => ['dto' => 'cusStatus'                , 'type' => 'string'],
            'c_regionuid'           => ['dto' => 'cusRegionId'              , 'type' => 'int'],
            'c_area'                => ['dto' => 'cusAreaId'                , 'type' => 'int'],
            'c_address'             => ['dto' => 'cusAddress1'              , 'type' => 'string'],
            'c_location'            => ['dto' => 'cusAddress2'              , 'type' => 'string'],
            'c_postal'              => ['dto' => 'cusPostalCode'            , 'type' => 'string'],
            'c_city'                => ['dto' => 'cusCity'                  , 'type' => 'string'],
            'c_province'            => ['dto' => 'cusProvince'              , 'type' => 'string'],
            'c_geolat'              => ['dto' => 'cusGeoLat'                , 'type' => 'float'],
            'c_geolon'              => ['dto' => 'cusGeoLon'                , 'type' => 'float'],
            'c_email'               => ['dto' => 'cusEmail'                 , 'type' => 'string'],
            'c_phone'               => ['dto' => 'cusPhone'                 , 'type' => 'string'],
            'c_phoneext'            => ['dto' => 'cusPhoneExt'              , 'type' => 'string'],
            'c_contractdate'        => ['dto' => 'cusContractDate'          , 'type' => 'date'],
            'c_contractby'          => ['dto' => 'cusContractedBy'          , 'type' => 'string'],
            'c_installdate'         => ['dto' => 'cusInstallDate'           , 'type' => 'date'],
            // 'c_fullcycle'           => ['dto' => 'cusFullCycle'             , 'type' => 'decimal'],
            // 'c_fullcycleflag'       => ['dto' => 'cusFullCycleFlag'         , 'type' => 'bool'],
            // 'c_fullcycleforced'     => ['dto' => 'cusFullCycleForced'       , 'type' => 'decimal'],
            // 'c_forceddate'          => ['dto' => 'cusFullCycleForcedDate'   , 'type' => 'date'],
            'c_schedule'            => ['dto' => 'cusSchedule'              , 'type' => 'string'],
            'c_scheduleday'         => ['dto' => 'cusScheduledays'          , 'type' => 'string'],
            'c_lastpaiddate'        => ['dto' => 'cusLastPaidDate'          , 'type' => 'date'],
            'c_rate'                => ['dto' => 'cusRate'                  , 'type' => 'float'],
            'c_paymenttype'         => ['dto' => 'cusPayMethod'             , 'type' => 'string'],
            'c_form_eu'             => ['dto' => 'cusIsccDate'              , 'type' => 'date'],
            'c_form_corsia'         => ['dto' => 'cusCorsiaDate'            , 'type' => 'date'],
            'c_hstno'               => ['dto' => 'cusHstNo'                 , 'type' => 'string'],
            'c_inactivedate'        => ['dto' => 'cusTerminatedDate'        , 'type' => 'date'],
            'c_lastpickupdate'      => ['dto' => 'cusLastPickupDate'        , 'type' => 'date'],
            'c_lastpickupquantity'  => ['dto' => 'cusLastPickupQty'         , 'type' => 'int'],
            'c_sludge'              => ['dto' => 'cusLastSludge'            , 'type' => 'int'],
            'c_comment_ri'          => ['dto' => 'cusComment'               , 'type' => 'string'],
            'c_comment_ci'          => ['dto' => 'cusContactComment'        , 'type' => 'string'],
            'c_createdby'           => ['dto' => 'cusExternalCreatedBy'     , 'type' => 'string'],
            'c_updatedby'           => ['dto' => 'cusExternalUpdatedBy'     , 'type' => 'string'],
            'c_salesperson'         => ['dto' => 'cusSalesperson'           , 'type' => 'string'],
            'c_salescommissiondate' => ['dto' => 'cusSalesCommissionDate'   , 'type' => 'string'],
            'c_salesmethod'         => ['dto' => 'cusSalesMethod'           , 'type' => 'string'],
            // 어차피 무시당함
            // 'c_createddate'         => ['dto' => 'cusCreatedAt'             , 'type' => 'datetime'],
            // 'c_updateddate'         => ['dto' => 'cusUpdatedAt'             , 'type' => 'datetime'],
        ];
    }

    // VALUE TRANSFORM
    private static function transformValue(
        $value,
        string $type
    ) {

        switch ($type) {

            case 'int':
                return ($value === ''||$value === null) ? null : (int)$value;

            case 'float':
                return ($value === ''||$value === null) ? null : (float)$value;

            case 'decimal':
                return ($value === ''||$value === null) ? null : (float)$value;

            case 'bool':
                return ($value == '1'||$value === 1||$value === true);

            case 'date':
                return self::date($value);

            case 'datetime':
                return self::datetime($value);

            default:
                return ($value === null) ? null : rtrim((string)$value);
        }
    }

    private static function isDifferent($a, $b): bool
    {
        if (is_numeric($a) && is_numeric($b)) {
            return (float)$a != (float)$b;
        }

        return $a !== $b;
    }

    private static function date($value)
    {
        $value = trim((string)$value);
        if ($value == '') {
            return null;
        }

        $value = preg_replace('/[^0-9]/','',$value);
        if (strlen($value) != 8) {
            return null;
        }

        return
            substr($value, 0, 4)
            . '-'
            . substr($value, 4, 2)
            . '-'
            . substr($value, 6, 2);
    }

    private static function datetime($yyyymmddhhmiss)
	{
		if (
			empty($yyyymmddhhmiss)
			|| strlen($yyyymmddhhmiss) != 14
		) {
			return null;
		}

		return substr($yyyymmddhhmiss,0,4)."-".
			substr($yyyymmddhhmiss,4,2)."-".
			substr($yyyymmddhhmiss,6,2)."T".
			substr($yyyymmddhhmiss,8,2).":".
			substr($yyyymmddhhmiss,10,2).":".
			substr($yyyymmddhhmiss,12,2);
	}
}