ACA 20201110

<?php

/*
include => warning
include "fich";
include_once "caminho/fich";

require => error
require "fich/sdsd/sdsD/f";
*/
require_once "AmUtil.php";

//https://codeshare.luismeneses.pt/
//https://curl.haxx.se/docs/sslcerts.html
//https://curl.se/docs/caextract.html

//edit php.ini and add
//curl.cainfo="C:/<path to my php installation folder>/cacert.pem"

define ("TEST_URL", "https://apod.nasa.gov/apod/ap141231.html");
// ... "<IMG SRC="image/2011/M78... "
//https://apod.nasa.gov/apod/image/2011/M78_LDN1622_BarnardsLoop_SEP27_28_Oct15_final1024.jpg

class ApodBot{
    //consts?
    const APOD_URL = "https://apod.nasa.gov/apod/";
    const DESIRED_NUMBER_OF_DIGITS = 2;
    //const BOT_SIGNATURE = "For educational tests only";
    /*
     * the structure of an APOD URL:
     * https://apod.nasa.gov/apod/apYYMMDD.html
     * e.g.: https://apod.nasa.gov/apod/ap141231.html
     */

    private
        $mCurrentYear,
        $mCurrentMonth,
        $mCurrentDay;

    public function __construct(){
        /*
         * Y - format for year with 4 digits
         * m - format for month with 2 digits
         * d - format for day with 2 digits
         */
        $strYMD = date("Y-m-d"); //"2020-11-05"

        $aDateParts = explode("-", $strYMD);
        /*
         * $aDateParts = [
         * 0 => "2020", 1 => "11", 2 => "05"
         * ];
         */

        $this->mCurrentYear =
            intval($aDateParts[0]);

        $this->mCurrentMonth =
            intval($aDateParts[1]);

        $this->mCurrentDay =
            intval($aDateParts[2]);
    }//__construct

    //data members?

    //methods?
    //https://apod.nasa.gov/apod/ap141231.html

    /*
     * receives 3 ints: year, month, day
     * returns a string in the format
     * https://apod.nasa.gov/apod/apYYMMDD.html
     */
    public function urlForDay(
        int $pYear=0, //2020
        int $pMonth=0, //12->"12" 5->"05"
        int $pDay=0 //31->"31" 1->"01"
    ){
        $strUrlForDay = "";
        $strYear=$strMonth=$strDay="";

        //pattern for default values for parameters
        $pYear = empty($pYear) ?
            $this->mCurrentYear
            :
            $pYear;

        $pMonth =
            empty($pMonth) ?
            $this->mCurrentMonth
            :
            $pMonth;

        $pDay =
            empty($pDay) ?
            $this->mCurrentDay
            :
            $pDay;
        /*
        293029 (6 excede 2 = 6-2=4)
        9999 (4 excede 2 em 4-2=2)
        999 (3 excede 2 em 3-2=1)
        */

        $strYear = $pYear . "";
        if (
            $iSizeOfYear=strlen($strYear)
            >
            self::DESIRED_NUMBER_OF_DIGITS
        ){
            $iExcessDigits =
                $iSizeOfYear
                -
                self::DESIRED_NUMBER_OF_DIGITS;
            $strYear = substr(
                $strYear,
                $iExcessDigits-1, //start position
                self::DESIRED_NUMBER_OF_DIGITS //2 symbols
            );
        }//if there is need to fix the string for year

        $strMonth = $pMonth<10 ? "0".$pMonth : $pMonth."";

        $strDay = $pDay<10 ? "0".$pDay : $pDay."";

        /*
         * sprintf is "print into a string following a format"
         * https://apod.nasa.gov/apod/apYYMMDD.html
         */
        $strUrlForDay = sprintf(
            "%sap%s%s%s.html",
            self::APOD_URL, //"https://apod.nasa.gov/apod/"
            $strYear,
            $strMonth,
            $strDay
        );

        return $strUrlForDay;
    }//urlForDay

    const IMAGE_MARK = "<img src=\"";
    public function identifyImgInSourceCode(
        $pSrcCode
    ){
        $iWhereDoesImgElementStart =
            stripos(
                $pSrcCode,
                self::IMAGE_MARK
            );

        //it exists!
        if ($iWhereDoesImgElementStart!==false){
            $strContainsTheImgAddress =
                substr(
                    $pSrcCode,
                    $iWhereDoesImgElementStart
                    +
                    strlen(self::IMAGE_MARK)
                );

            $strImgUrl =
                substr(
                    $strContainsTheImgAddress,
                    0,
                    strpos(
                        $strContainsTheImgAddress,
                        "\"" //the closing double-quote
                    )
                );

            return self::APOD_URL.$strImgUrl;
        }
    }//identifyImgInSourceCode

    public function downloadImgForDay(
        $pY=0,
        $pM=0,
        $pD=0
    ){
        $bDownloadTodaysImg = empty($pY) && empty($pM) && empty($pD);

        //e.g. https://apod.nasa.gov/apod/ap201110.html
        $strUrlForTheHtmlPageThatPublishedTheImg = "";
        if ($bDownloadTodaysImg){
            $strUrlForTheHtmlPageThatPublishedTheImg =
                $this->urlForDay();
        }//if
        else{
            $strUrlForTheHtmlPageThatPublishedTheImg =
                $this->urlForDay($pY, $pM, $pD);
        }//else

        //source code of the html page
        $strHtmlSourceCode = AmUtil::consumeUrl($strUrlForTheHtmlPageThatPublishedTheImg);

        //this is the image direct URL
        $strUrlForTheImg = $this->identifyImgInSourceCode(
            $strHtmlSourceCode
        );

        //string/bytes array which is the published image
        //this is the download
        $bytesForTheImg = AmUtil::consumeUrl(
            $strUrlForTheImg
        );

        $iBytesWrittenOrFalse =
            file_put_contents(
                "saved.jpg",
                $bytesForTheImg
            );

        return $iBytesWrittenOrFalse;
    }//downloadImgForDay
}//ApodBot

$bot = new ApodBot(); //constructor
//$bot->getImageOfTheDay(); //image of the day (today)
$strUrl = $bot->urlForDay();
echo $strUrl.PHP_EOL;

$strUrl = $bot->urlForDay(2019, 12, 25);
echo $strUrl.PHP_EOL;

//$sourceCode = ApodBot::consumeUrl(TEST_URL);
$sourceCode = AmUtil::consumeUrl($bot->urlForDay());
echo $sourceCode;

$urlForTodaysImg = $bot->identifyImgInSourceCode(
    $sourceCode
);

echo $urlForTodaysImg.PHP_EOL;

/*
$bot->getImageOfTheDay(2019, 12, 25);//image on that date
$bot->getEntireCollection();
$bot->getAllImagemFromYear(2000);
$bot->getAllImagemFromMonth(2000, 4);
*/
echo $bot->downloadImgForDay();