ics-php-renderer/php/flow.php

<?php
require_once ('ics.php');

$ical = null;
if (isset ($_GET["ics_url"])) {
    $ical = getCalendar($_GET["ics_url"]);
}

/**
 * Fetches the user requested start date for the flow
 */
function getRequestedStartDate () {
    global $_GET, $requested_start_date;

    if (isset ($requested_start_date)) return $requested_start_date;

    if (
        ! isset ($_GET["start_date"]) ||
        ! ($requested_start_date = new DateTime ($_GET["start_date"]))
    ) {
        $requested_start_date = new DateTime ();
    }

    return $requested_start_date;
}

/**
 * Fetches the user requested amount of days to display
 */
function getRequestedDisplayedDays () {
    global $_GET, $requested_display_days;

    if (isset ($requested_display_days)) return $requested_display_days;

    if (
        ! isset ($_GET["days"]) ||
        ! ($requested_display_days = intval($_GET["days"]))
    ) {
        $requested_display_days = 7;
    }

    return $requested_display_days;
}

/**
 * Return HTML for a flow day entry
 * 
 * @param ICal     $ical ICal object
 * @param DateTime $date DateTime object
 * 
 * @return string Returns HTML with flow day entry
 * @return false  False on failure
 */
function generateFlowEntryForDay ($ical, $date) {
    if ($ical == null || $date == null) return false;

    $html = sprintf (
        '
            <div class="flow-element">
                <div class="flow-day-name">
                    <div class="day">%s</div>
                    <div class="weekday">%s</div>
                </div>
                <div class="flow-day-entries">
                    %%s
                </div>
            </div>
        ',
        $date -> format ("d"),
        getLocalizedShortDayName (
            intval ($date -> format ("N"))
        )
    );

    // Fetch events for the specified date
    $events = getEventsForDate ($ical, $date);

    // Skip empty days
    if (count ($events) == 0) return "";

    // Iterate over each event and add an event entry to the HTML
    foreach ($events as $event) {
        $dtstart = $ical -> iCalDateToDateTime($event -> dtstart_array[3]);
        $dtend   = $ical -> iCalDateToDateTime($event -> dtend_array[3]);
        
        $today_end = clone $date; $today_end -> modify("+1 day");
        
        $time_separator = " - ";
        $time_prefix    = "";
        $time_start = $dtstart -> format('H:i');
        $time_end   = $dtend   -> format('H:i');

        // When start date is in past, don't display start time
        if ($dtstart < $date) {
            $time_start = "";
            $time_separator = "Bis ";
        }

        // When end date is in future, don't display end time
        if ($dtend > $today_end) {
            $time_end = "";
            $time_separator = "";
            $time_prefix = "Ab ";
        }
            
        // Assemble time display string
        $time_str = "{$time_prefix}{$time_start}{$time_separator}{$time_end}";

        // Check if event is all day
        if ($time_start == "00:00" && $time_end == "00:00") {
            $time_str = "Ganztägig";
        }

        // Check if event is multi day
        if ($time_start == "" && $time_end == "") {
            $time_str = "Mehrtägig";
        }

        // Check if multi day event without start times
        if ($time_start . $time_end == "00:00") {
            $time_str = "Mehrtägig";
        }
        
        $html = sprintf (
            $html,
            sprintf (
                '<div class="flow-day-entry">
                    <span class="description">%s</span>
                    <span class="time">%s</span>
                </div>
                %%s',
                $event -> summary,
                $time_str
            ),
        );
    }

    $html = sprintf ($html, '');
    return $html;
}

/**
 * Return HTML with flow header for specific date
 * 
 * @param DateTime $date DateTime object
 * 
 * @return string Returns HTML with flow header
 * @return false  False on failure
 */
function generateFlowHeader ($date) {
    if ($date == null) return false;

    return sprintf (
        '<div class="flow-header">
            <div class="flow-header-spacer"></div>
            <div class="flow-header-value">%s</div>
        </div>',
        getLocalizedMonthName (intval ($date -> format ("m")))
    );
}

/**
 * Return HTML for the flow body
 * 
 * @param ICal     $ical ICal object
 * @param DateTime $date DateTime object
 * @param int      $days Days to display
 * 
 * @return string Returns HTML with the entire flow data
 * @return false  False on failure
 */
function generateFlowData ($ical, $date, $days) {
    if ($ical == null || $date == null) return false;

    $html = generateFlowHeader ($date) . "\n%s";

    $end_date = clone $date; $end_date -> modify ("+{$days} days");
    while ($date <= $end_date) {
        if ($date -> format ("d") == "01") $html = sprintf (
            $html,
            generateFlowHeader ($date) . "\n%s"
        );
        
        $html = sprintf (
            $html,
            generateFlowEntryForDay($ical, $date) . "%s"
        );

        $date -> modify ("+1 day");
    }

    $html = sprintf ($html, "");
    return $html;
}

/**
 * Echoes the entire HTML for the flow body
 */
function echoFlowBody () {
    global $ical;

    echo generateFlowData (
        $ical,
        getRequestedStartDate(),
        getRequestedDisplayedDays()
    );
}