<?php

/**
 * @return string
 */
function admin_shifts_title()
{
    return _("Create shifts");
}

/**
 * Assistent zum Anlegen mehrerer neuer Schichten
 *
 * @return string
 */
function admin_shifts()
{
    $valid = true;

    $start = parse_date("Y-m-d H:i", date("Y-m-d") . " 00:00");
    $end = $start;
    $mode = 'single';
    $angelmode = 'manually';
    $length = '';
    $change_hours = [];
    $title = "";
    $shifttype_id = null;

    // Locations laden (auch unsichtbare - fuer Erzengel ist das ok)
    $rooms = sql_select("SELECT * FROM `Room` ORDER BY `Name`");
    $room_array = [];
    foreach ($rooms as $room) {
        $room_array[$room['RID']] = $room['Name'];
    }

    // Engeltypen laden
    $types = sql_select("SELECT * FROM `AngelTypes` ORDER BY `name`");
    $needed_angel_types = [];
    foreach ($types as $type) {
        $needed_angel_types[$type['id']] = 0;
    }

    // Load shift types
    $shifttypes_source = ShiftTypes();
    if ($shifttypes_source === false) {
        engelsystem_error('Unable to load shift types.');
    }
    $shifttypes = [];
    foreach ($shifttypes_source as $shifttype) {
        $shifttypes[$shifttype['id']] = $shifttype['name'];
    }

    if (isset($_REQUEST['preview']) || isset($_REQUEST['back'])) {
        if (isset($_REQUEST['shifttype_id'])) {
            $shifttype = ShiftType($_REQUEST['shifttype_id']);
            if ($shifttype === false) {
                engelsystem_error('Unable to load shift type.');
            }
            if ($shifttype == null) {
                $valid = false;
                error(_('Please select a shift type.'));
            } else {
                $shifttype_id = $_REQUEST['shifttype_id'];
            }
        } else {
            $valid = false;
            error(_('Please select a shift type.'));
        }

        // Name/Bezeichnung der Schicht, darf leer sein
        $title = strip_request_item('title');

        // Auswahl der sichtbaren Locations für die Schichten
        if (
            isset($_REQUEST['rid'])
            && preg_match("/^[0-9]+$/", $_REQUEST['rid'])
            && isset($room_array[$_REQUEST['rid']])
        ) {
            $rid = $_REQUEST['rid'];
        } else {
            $valid = false;
            $rid = $rooms[0]['RID'];
            error(_('Please select a location.'));
        }

        if (isset($_REQUEST['start']) && $tmp = parse_date("Y-m-d H:i", $_REQUEST['start'])) {
            $start = $tmp;
        } else {
            $valid = false;
            error(_('Please select a start time.'));
        }

        if (isset($_REQUEST['end']) && $tmp = parse_date("Y-m-d H:i", $_REQUEST['end'])) {
            $end = $tmp;
        } else {
            $valid = false;
            error(_('Please select an end time.'));
        }

        if ($start >= $end) {
            $valid = false;
            error(_('The shifts end has to be after its start.'));
        }

        if (isset($_REQUEST['mode'])) {
            if ($_REQUEST['mode'] == 'single') {
                $mode = 'single';
            } elseif ($_REQUEST['mode'] == 'multi') {
                if (isset($_REQUEST['length']) && preg_match("/^[0-9]+$/", trim($_REQUEST['length']))) {
                    $mode = 'multi';
                    $length = trim($_REQUEST['length']);
                } else {
                    $valid = false;
                    error(_('Please enter a shift duration in minutes.'));
                }
            } elseif ($_REQUEST['mode'] == 'variable') {
                if (
                    isset($_REQUEST['change_hours'])
                    && preg_match("/^([0-9]{2}(,|$))/", trim(str_replace(" ", "", $_REQUEST['change_hours'])))
                ) {
                    $mode = 'variable';
                    $change_hours = array_map('trim', explode(",", $_REQUEST['change_hours']));
                } else {
                    $valid = false;
                    error(_('Please split the shift-change hours by colons.'));
                }
            }
        } else {
            $valid = false;
            error(_('Please select a mode.'));
        }

        if (isset($_REQUEST['angelmode'])) {
            if ($_REQUEST['angelmode'] == 'location') {
                $angelmode = 'location';
            } elseif ($_REQUEST['angelmode'] == 'manually') {
                $angelmode = 'manually';
                foreach ($types as $type) {
                    if (
                        isset($_REQUEST['type_' . $type['id']])
                        && preg_match("/^[0-9]+$/", trim($_REQUEST['type_' . $type['id']]))
                    ) {
                        $needed_angel_types[$type['id']] = trim($_REQUEST['type_' . $type['id']]);
                    } else {
                        $valid = false;
                        error(sprintf(_('Please check the needed angels for team %s.'), $type['name']));
                    }
                }
                if (array_sum($needed_angel_types) == 0) {
                    $valid = false;
                    error(_('There are 0 angels needed. Please enter the amounts of needed angels.'));
                }
            } else {
                $valid = false;
                error(_('Please select a mode for needed angels.'));
            }
        } else {
            $valid = false;
            error(_('Please select needed angels.'));
        }

        // Beim Zurück-Knopf das Formular zeigen
        if (isset($_REQUEST['back'])) {
            $valid = false;
        }

        // Alle Eingaben in Ordnung
        if ($valid) {
            if ($angelmode == 'location') {
                $needed_angel_types = [];
                $needed_angel_types_location = sql_select("SELECT * FROM `NeededAngelTypes` WHERE `room_id`='" . sql_escape($rid) . "'");
                foreach ($needed_angel_types_location as $type) {
                    $needed_angel_types[$type['angel_type_id']] = $type['count'];
                }
            }
            $shifts = [];
            if ($mode == 'single') {
                $shifts[] = [
                    'start'        => $start,
                    'end'          => $end,
                    'RID'          => $rid,
                    'title'        => $title,
                    'shifttype_id' => $shifttype_id
                ];
            } elseif ($mode == 'multi') {
                $shift_start = (int)$start;
                do {
                    $shift_end = $shift_start + (int)$length * 60;

                    if ($shift_end > $end) {
                        $shift_end = $end;
                    }
                    if ($shift_start >= $shift_end) {
                        break;
                    }

                    $shifts[] = [
                        'start'        => $shift_start,
                        'end'          => $shift_end,
                        'RID'          => $rid,
                        'title'        => $title,
                        'shifttype_id' => $shifttype_id
                    ];

                    $shift_start = $shift_end;
                } while ($shift_end < $end);
            } elseif ($mode == 'variable') {
                rsort($change_hours);
                $day = parse_date("Y-m-d H:i", date("Y-m-d", $start) . " 00:00");
                $change_index = 0;
                // Ersten/nächsten passenden Schichtwechsel suchen
                foreach ($change_hours as $i => $change_hour) {
                    if ($start < $day + $change_hour * 60 * 60) {
                        $change_index = $i;
                    } elseif ($start == $day + $change_hour * 60 * 60) {
                        // Start trifft Schichtwechsel
                        $change_index = ($i + count($change_hours) - 1) % count($change_hours);
                        break;
                    } else {
                        break;
                    }
                }

                $shift_start = $start;
                do {
                    $day = parse_date("Y-m-d H:i", date("Y-m-d", $shift_start) . " 00:00");
                    $shift_end = $day + $change_hours[$change_index] * 60 * 60;

                    if ($shift_end > $end) {
                        $shift_end = $end;
                    }
                    if ($shift_start >= $shift_end) {
                        $shift_end += 24 * 60 * 60;
                    }

                    $shifts[] = [
                        'start'        => $shift_start,
                        'end'          => $shift_end,
                        'RID'          => $rid,
                        'title'        => $title,
                        'shifttype_id' => $shifttype_id
                    ];

                    $shift_start = $shift_end;
                    $change_index = ($change_index + count($change_hours) - 1) % count($change_hours);
                } while ($shift_end < $end);
            }

            $shifts_table = [];
            foreach ($shifts as $shift) {
                $shifts_table_entry = [
                    'timeslot'      =>
                        '<span class="glyphicon glyphicon-time"></span> '
                        . date("Y-m-d H:i", $shift['start'])
                        . ' - '
                        . date("H:i", $shift['end'])
                        . '<br />'
                        . Room_name_render(Room($shift['RID'])),
                    'title'         =>
                        ShiftType_name_render(ShiftType($shifttype_id))
                        . ($shift['title'] ? '<br />' . $shift['title'] : ''),
                    'needed_angels' => ''
                ];
                foreach ($types as $type) {
                    if (isset($needed_angel_types[$type['id']]) && $needed_angel_types[$type['id']] > 0) {
                        $shifts_table_entry['needed_angels'] .= '<b>' . AngelType_name_render($type) . ':</b> ' . $needed_angel_types[$type['id']] . '<br />';
                    }
                }
                $shifts_table[] = $shifts_table_entry;
            }

            // Fürs Anlegen zwischenspeichern:
            $_SESSION['admin_shifts_shifts'] = $shifts;
            $_SESSION['admin_shifts_types'] = $needed_angel_types;

            $hidden_types = "";
            foreach ($needed_angel_types as $type_id => $count) {
                $hidden_types .= form_hidden('type_' . $type_id, $count);
            }
            return page_with_title(_("Preview"), [
                form([
                    $hidden_types,
                    form_hidden('shifttype_id', $shifttype_id),
                    form_hidden('title', $title),
                    form_hidden('rid', $rid),
                    form_hidden('start', date("Y-m-d H:i", $start)),
                    form_hidden('end', date("Y-m-d H:i", $end)),
                    form_hidden('mode', $mode),
                    form_hidden('length', $length),
                    form_hidden('change_hours', implode(', ', $change_hours)),
                    form_hidden('angelmode', $angelmode),
                    form_submit('back', _("back")),
                    table([
                        'timeslot'      => _('Time and location'),
                        'title'         => _('Type and title'),
                        'needed_angels' => _('Needed angels')
                    ], $shifts_table),
                    form_submit('submit', _("Save"))
                ])
            ]);
        }
    } elseif (isset($_REQUEST['submit'])) {
        if (!is_array($_SESSION['admin_shifts_shifts']) || !is_array($_SESSION['admin_shifts_types'])) {
            redirect(page_link_to('admin_shifts'));
        }

        $needed_angel_types_info = [];
        foreach ($_SESSION['admin_shifts_shifts'] as $shift) {
            $shift['URL'] = null;
            $shift['PSID'] = null;
            $shift_id = Shift_create($shift);
            if ($shift_id === false) {
                engelsystem_error('Unable to create shift.');
            }

            engelsystem_log(
                "Shift created: " . $shifttypes[$shift['shifttype_id']]
                . " with title " . $shift['title']
                . " from " . date("Y-m-d H:i", $shift['start'])
                . " to " . date("Y-m-d H:i", $shift['end'])
            );

            foreach ($_SESSION['admin_shifts_types'] as $type_id => $count) {
                $angel_type_source = sql_select("SELECT * FROM `AngelTypes` WHERE `id`='" . sql_escape($type_id) . "' LIMIT 1");
                if (count($angel_type_source) > 0) {
                    sql_query("INSERT INTO `NeededAngelTypes` SET `shift_id`='" . sql_escape($shift_id) . "', `angel_type_id`='" . sql_escape($type_id) . "', `count`='" . sql_escape($count) . "'");
                    $needed_angel_types_info[] = $angel_type_source[0]['name'] . ": " . $count;
                }
            }
        }

        engelsystem_log("Shift needs following angel types: " . join(", ", $needed_angel_types_info));
        success("Schichten angelegt.");
        redirect(page_link_to('admin_shifts'));
    } else {
        unset($_SESSION['admin_shifts_shifts']);
        unset($_SESSION['admin_shifts_types']);
    }

    if (!isset($_REQUEST['rid'])) {
        $_REQUEST['rid'] = null;
    }
    $angel_types = "";
    foreach ($types as $type) {
        $angel_types .= '<div class="col-md-4">' . form_spinner(
                'type_' . $type['id'],
                $type['name'],
                $needed_angel_types[$type['id']]
            )
            . '</div>';
    }

    return page_with_title(admin_shifts_title(), [
        msg(),
        form([
            form_select('shifttype_id', _('Shifttype'), $shifttypes, $shifttype_id),
            form_text('title', _("Title"), $title),
            form_select('rid', _("Room"), $room_array, $_REQUEST['rid']),
            div('row', [
                div('col-md-6', [
                    form_text('start', _("Start"), date("Y-m-d H:i", $start)),
                    form_text('end', _("End"), date("Y-m-d H:i", $end)),
                    form_info(_("Mode"), ''),
                    form_radio('mode', _("Create one shift"), $mode == 'single', 'single'),
                    form_radio('mode', _("Create multiple shifts"), $mode == 'multi', 'multi'),
                    form_text('length', _("Length"), !empty($_REQUEST['length']) ? $_REQUEST['length'] : '120'),
                    form_radio(
                        'mode',
                        _("Create multiple shifts with variable length"),
                        $mode == 'variable',
                        'variable'
                    ),
                    form_text(
                        'change_hours',
                        _("Shift change hours"),
                        !empty($_REQUEST['change_hours']) ? $_REQUEST['change_hours'] : '00, 04, 08, 10, 12, 14, 16, 18, 20, 22'
                    )
                ]),
                div('col-md-6', [
                    form_info(_("Needed angels"), ''),
                    form_radio(
                        'angelmode',
                        _("Take needed angels from room settings"),
                        $angelmode == 'location',
                        'location'
                    ),
                    form_radio('angelmode', _("The following angels are needed"), $angelmode == 'manually', 'manually'),
                    div('row', [
                        $angel_types
                    ])
                ])
            ]),
            form_submit('preview', _("Preview"))
        ])
    ]);
}