WEB/src/Controller/SSPController.php

<?php
namespace App\Controller;

use App\Utility\EprosumeModel;
use App\Utility\WalletEprosumeModel;

use Cake\Core\Configure;
use Cake\Http\Exception\ForbiddenException;
use Cake\Http\Exception\NotFoundException;
use Cake\View\Exception\MissingTemplateException;

abstract class SSPController extends AppController
{
    protected $EprosumeModel = null;
    protected $WalletEprosumeModel = null;

    public function initialize()
    {
        parent::initialize();
        $this->EprosumeModel = new EprosumeModel();
        $this->WalletEprosumeModel = new WalletEprosumeModel();
    }

    protected function doSetPrice($prosumer, $buyPrice, $sellPrice)
    {
        $this->autoRender = false;
        if(
            !in_array($prosumer, $this->WalletEprosumeModel->getProsumers(1))
            ||
            !is_numeric($buyPrice)
            ||
            !is_numeric($sellPrice)
        ) {
            return $this->response->withStatus(400);
        }

        $results = $this->WalletEprosumeModel->setPrice($prosumer, $buyPrice, $sellPrice);

        if(empty($results)) {
            return $this->response->withStatus(502);
        } else {
            $this->EprosumeModel->setPrice($prosumer, $buyPrice, $sellPrice);
            return $this->response = $this->response
                ->withStatus(200)
                ->withType('application/json')
            ;
        }
    }

    protected function doTransfer($from, $prosumer, $amount, $asset, $memo)
    {
        $this->autoRender = false;
        if(
            !in_array($from, $this->WalletEprosumeModel->getProsumers(1))
            ||
            !in_array($prosumer, $this->WalletEprosumeModel->getProsumers(1))
            ||
            $from == $prosumer
            ||
            !is_numeric($amount)
            ||
            !in_array($asset, $this->EprosumeModel->getAssetsType())
            ||
            !is_string($memo)
        ) {
            return $this->response->withStatus(400);
        }

        $results = $this->WalletEprosumeModel->transfer($from, $prosumer, $amount, $asset, $memo);
        if(empty($results)) {
            return $this->response->withStatus(502);
        } else {
            return $this->response
                ->withStatus(200)
                ->withType('application/json')
            ;
        }         
    }

    public function blocks() {
        $qs = $this->request->getAttribute('params')["?"] ?? [];
        $asset = $qs["asset"] ?? null;
        $date_from = $qs["from"] ?? (new \DateTime())->sub(new \DateInterval("P1D"))->format("Y-m-d H:i:s");
        $date_to = $qs["to"] ?? (new \DateTime())->format("Y-m-d H:i:s");
        $meter = $qs["meter"] ?? null; 
        $filters = [
            'date_from' => $date_from,
            'date_to' => $date_to,
            'meter' => $meter,
            'asset' => $asset,
        ];
        $asset && $filters['asset'] = $asset;
        $meter && $filters['meter'] = $meter;

        $blocks = $this->EprosumeModel->blocksList(
            $filters
        );
        return $blocks
            ? $this->response
                ->withStatus(200)
                ->withType('application/json')
                ->withStringBody(
                    $this->jsonEncodeGenerator($blocks)
                )
            : $this->response
                ->withStatus(200)
                ->withType('application/json')
                ->withStringBody(
                    $this->jsonEncodeGenerator([])
                )
            ;
    }

    public function balances() {
        $qs = $this->request->getAttribute('params')["?"] ?? [];
        $date_from = $qs["from"] ?? (new \DateTime())->sub(new \DateInterval("P1D"))->format("Y-m-d H:i:s");
        $date_to = $qs["to"] ?? (new \DateTime())->format("Y-m-d H:i:s");
        $meter = $qs["meter"] ?? null; 

        $balances = $this->EprosumeModel->balanceHistory($date_from, $date_to, $meter);
        return $balances
            ? $this->response
                ->withStatus(200)
                ->withType('application/json')
                ->withStringBody(
                    $this->jsonEncodeGenerator($balances)
                )
                : $this->response
                ->withStatus(200)
                ->withType('application/json')
                ->withStringBody(
                    $this->jsonEncodeGenerator([])
                )
            ;
    }

    public function charts($type, $meter_name) {
        $qs = $this->request->getAttribute('params')["?"] ?? $queryString; 
        $period = $qs['period'] ?? 0;
        $from = $qs['from'] ?? null;
        $to = $qs['to'] ?? null;
        $data = $this->EprosumeModel->charts($type, $meter_name, $from, $to, $period);
        return $data
            ? $this->response
                ->withStatus(200)
                ->withType('application/json')
                ->withStringBody(
                    $this->jsonEncodeGenerator($data)
                )
                : $this->response
                ->withStatus(200)
                ->withType('application/json')
                ->withStringBody(
                    $this->jsonEncodeGenerator([])
                )
            ;
    }

    protected function SSPResponse($dataset, $user_meter_id=null, array $queryString = [])
    {
        $this->autoRender = false;
        $qs = $this->request->getAttribute('params')["?"] ?? $queryString; 
        $format = $qs["format"] ?? "json";
        if(
            $format == "csv"
        ) {
            unset($qs["start"], $qs["length"]);
        }

        $qs["user_meter_id"] = $user_meter_id;
        $results = $this->EprosumeModel->dataTableSSP(
            $dataset, 
            $qs["user_meter_id"],
            ($qs["draw"] ?? 1), 
            ($qs["columns"] ?? [["data"=>"timestamp"]]),
            ($qs["order"] ?? [["column"=>0,"dir"=>"desc"]]),
            ($qs["start"] ?? null), 
            ($qs["length"] ?? null),
            ($qs["search"] ?? null),
            ($qs["meter"] ?? null),
            ($qs["txid"] ?? null),
            ($qs["from"] ?? null),
            ($qs["to"] ?? null),
            ($qs["period"] ?? null)
        );
        if($format == "json") {
            $dataString = $this->jsonEncodeGenerator($results["data"]);
            if( $this->request->is('ajax') ) {
                $draw = $results["draw"];
                $recordsFiltered = $results["recordsFiltered"];
                $recordsTotal = $results["recordsTotal"];
                $body = $this->setDataTableResponse($dataString, $recordsTotal, $recordsFiltered, $draw);
            } else {
                $body = $dataString;
            }
            $this->response = $this->response
                ->withStatus(200)
                ->withType('application/json')
                ->withStringBody($body);
            return $this->response;
        } else if($format == "csv") {
            $csvFileHandle = $this->csvTmpFileGenerator($results["data"], $qs["columns"]);
            $csvFilePath = stream_get_meta_data($csvFileHandle)['uri'];
            $csvContent = file_get_contents($csvFilePath);
            return $this->response
                ->withType("text/csv")
                ->withDownload("eProsume_export_".$dataset."_".date("YmdHis").".csv")
                ->withLength(strlen($csvContent))
                ->withStringBody($csvContent);
        }
        return null;
    }

    protected function getRequestInput() {
        return array_map(
            function($v) {
                return filter_var($v, FILTER_SANITIZE_STRING);
            },
            json_decode($this->request->input(), true) ?? []
        );
    }

    protected function jsonEncodeGenerator(iterable $generator) 
    {
        $memory_limit = 5 * 1024 * 1024;
        $fp = fopen("php://temp", 'r+');
        fputs($fp, '[');
        foreach ($generator as $key => $value) {
            if(is_null($value)) {
                continue;
            }
            if ($key != 0) {
                fputs($fp, ','); 
            }
            fputs($fp, json_encode($value));
        }
        fputs($fp, ']');
        rewind($fp);
        return stream_get_contents($fp);
    }

    protected function csvTmpFileGenerator(iterable $generator, array $columns) 
    {
        $memory_limit = 5 * 1024 * 1024;
        $fp = tmpfile();
        foreach ($columns as $column) {
            fputs($fp, (empty($column["name"]) ? $column["data"] : $column["name"]) );
            fputs($fp, ";");
        }
        fputs($fp, PHP_EOL); 
        foreach ($generator as $key => $row) {
            if(is_null($row)) {
                continue;
            }
            if ($key != 0) {
                fputs($fp, PHP_EOL); 
            }
            foreach($row as $k=>$value) {
                if($k=="id") {
                    continue;
                }
                fputs($fp, $value);
                fputs($fp, ";");    
            }
        }
        return $fp;
    }

    protected function setDataTableResponse($dataString, $recordsTotal, $recordsFiltered, $draw)
    {
        $memory_limit = 5 * 1024 * 1024;
        $fp = fopen("php://temp", 'r+');
        fputs($fp, '{');
        fputs($fp, '"draw": '.$draw.',');
        fputs($fp, '"recordsTotal": '.$recordsTotal.',');
        fputs($fp, '"recordsFiltered": '.$recordsFiltered.',');
        fputs($fp, '"data": '.$dataString);
        fputs($fp, '}');
        rewind($fp);
        return stream_get_contents($fp);
    }

}