<?php
// SPDX-FileCopyrightText: 2021 Andrea Chirulescu <andrea.chirulescu@gmail.com>
// SPDX-FileCopyrightText: 2021 Harald Eilertsen <haraldei@anduin.net>
//
// SPDX-License-Identifier: AGPL-3.0-or-later

require_once __DIR__ . '/../../view-helpers/select_field.php';

if (!class_exists("GiglogAdmin_ConcertsTable"))
{
    class GiglogAdmin_ConcertsTable
    {
        const STATUS_LABELS = [
            '',
            'Accred Requested',
            'Photo Approved',
            'Text Approved',
            'Photo and Text Approved',
            'Rejected'
        ];

        const FILTER_KEYS = [
            'city',
            'venue',
            'month',
            'only_mine'
        ];

        private string $username;
        private array $filter;

        private int $page_no = 1;
        private int $total_no_of_pages = 1;
        private int $previous_page = 0;
        private int $next_page = 0;

        private string $nonce;

        public static function update() : void
        {
            //
            // Check that we get a nonce, and that it is valid to prevent CSRF attacks.
            //
            if (!isset($_POST['nonce']) || !wp_verify_nonce($_POST['nonce'], 'concerts-table')) {
                wp_die('You are not allowed to do that.', 403);
                exit();
            }

            if (isset($_POST['assignitem'])) {
                $concert = GiglogAdmin_Concert::get(intval($_POST['cid']));

                if ($concert) {
                    $role = sanitize_text_field($_POST['pid']);
                    self::assignconcert($role, $concert);
                }

                return;
            }

            if (isset($_POST['unassignitem'])) {
                $concert = GiglogAdmin_Concert::get(intval($_POST['cid']));

                if ($concert) {
                    $role = sanitize_text_field($_POST['pid']);
                    self::unassignconcert($role, $concert);
                }

                return;
            }

            // handle the status drop down
            if (isset($_POST['selectstatus']) && !empty($_POST['selectstatus']) && !empty($_POST['cid'])) {
                if ($_POST['selectstatus'] > 0 && $_POST['selectstatus'] < count(self::STATUS_LABELS)) {
                    $concert = GiglogAdmin_Concert::get(intval($_POST['cid']));
                    if ( $concert ) {
                        $concert->set_status(intval($_POST['selectstatus']));
                        $concert->save();
                        self::emailuser($concert,intval($_POST['selectstatus']));
                    }
                }
            }
        }

        static function assignconcert(string $p1, GiglogAdmin_Concert $concert): void
        {
            $username = wp_get_current_user()->user_login;
            $concert->assign_role($p1, $username);
            $concert->save();

            $cuser = get_user_by( 'login', 'etadmin');

            if ( $cuser ) {
                $dest = $cuser->user_email;
                $subject = 'WP-GIGLOG '.$username.' has taken '.$p1. 'for concert '.$concert->cname();
                $body = 'WP-GIGLOG '.$username.' has taken '.$p1. 'for concert '.$concert->cname().', concert with ID ' .$concert->id();
                $headers = array('Content-Type: text/html; charset=UTF-8');

                wp_mail( $dest, $subject, $body );
            }
        }

        static function unassignconcert(string $p1, GiglogAdmin_Concert $concert): void
        {
            $username = wp_get_current_user()->user_login;
            $concert->remove_user_from_roles($username);
            $concert->save();

            $cuser = get_user_by( 'login', 'etadmin');

            if ( $cuser ) {
                $dest = $cuser->user_email;
                $subject = 'WP-GIGLOG '.$username.' has UNASSIGNED  '.$p1. 'for concert '.$concert->cname();
                $body = 'WP-GIGLOG '.$username.' has UNASSIGNED  '.$p1. 'for concert '.$concert->cname().', concert with ID ' .$concert->id();
                $headers = array('Content-Type: text/html; charset=UTF-8');

                wp_mail( $dest, $subject, $body );
            }
        }

        static function emailuser(GiglogAdmin_Concert $concert, string $cstatus): void
        {
            $username = wp_get_current_user()->user_login;
            $useremail = 'live@eternal-terror.com';
            $dest = '';
            $roles = $concert -> roles();
            $x = '';

            foreach ($roles as $role) {
                if($role){
                    $cuser = get_user_by( 'login', $role);

                    if ( $cuser ) {
                        $dest .= $cuser->user_email . ',';
                    }
                }
            }

            $subject = 'Message from GIGLOG: Concert '.$concert->cname().' has a new status  '.$cstatus. '.';
            $body = 'You receive this message because you have assigned one of the roles for Concert '.$concert->cname().'.';
            $body .= '\r\n This is to inform you that there is a new status for the acreditation  '.$cstatus. '.';
            $body .= '\r\n Should you no longer want to receive updates about this concert, please log in to Giglog and remove yourself from the concert. Thanks!';
            $headers = array('Content-Type: text/plain; charset=UTF-8'); //it is text by default so no need for headers actually

            wp_mail( $dest, $subject, $body );
        }

        public function __construct()
        {
            $this->username = wp_get_current_user()->user_login;

            // Set the nonce we use to check for CSRF attacks.
            $this->nonce = wp_create_nonce('concerts-table');
            $this->get_args();
        }

        public function render(): string
        {
            return $this->render_filters()
                . $this->render_concerts_table();
        }

        private function render_concert_table_header() : string
        {
            $content = '<div style="overflow-x:auto;"><table class="assignit">';
            $content.= '<span style="font-size:0.8em;font-style: italic;">Note: the iCal link will download a file with extension .ical which can be used to add the event to your calendar. For convenience, we set all events with start time at 19:00 but please check the actual event for the correct time.</span>';

            $content.= '<tr class="assignithrow">';
            $content.= '<th>CITY</th><th>DATE</th><th>NAME</th><th>VENUE</th>';

            if (!is_admin()) {
                $content .= '<th>EVENT</th><th>TICKETS</th><th>Calendar</th>';
            }
            else {
                $content .= '<th></th><th>PHOTO1</th><th>PHOTO2</th><th>TEXT1</th><th>TEXT2</th><th>STATUS</th>';
                if (current_user_can('administrator')) {
                    $content .= '<th>AdminOptions</th>';
                }
            }

            $content .= '</tr>';

            return $content;
        }

        private function get_args() : void
        {
            $this->filter = [];

            // Use the submitted "city" if any. Otherwise, use the default/static value.
            $cty = filter_input( INPUT_GET, 'city', FILTER_SANITIZE_SPECIAL_CHARS );
            if ($cty) {
                $this->filter['city'] = $cty;
            }

            $venue = filter_input( INPUT_GET, 'venue', FILTER_SANITIZE_SPECIAL_CHARS );
            if ($venue) {
                $this->filter['venue_id'] = $venue;
            }

            $smonth = filter_input( INPUT_GET, 'month', FILTER_SANITIZE_SPECIAL_CHARS );
            if ($smonth) {
                $this->filter['month'] = $smonth;
            }

            if(isset($_GET['only_mine']) && $_GET['only_mone'] == '1') {
                $this->filter['currentuser'] = $this->username;
            }

            if (isset($_GET['page_no']) && $_GET['page_no'] != "" && is_numeric($_GET['page_no']) && isset($_GET['page_no']) == $this->page_no  ) {
                $this->page_no = intval($_GET['page_no']);
            } else {
                $this->page_no = 1;
            }
        }

        private function get_concerts() : ?array
        {
            $total_records_per_page = 15;

            $total_concerts = GiglogAdmin_Concert::count( $this->filter );
            $this->total_no_of_pages = ceil( $total_concerts / $total_records_per_page );

            //calculate OFFSET Value and SET other Variables
            $offset = ($this->page_no - 1) * $total_records_per_page;
            $this->previous_page = $this->page_no - 1;
            $this->next_page = $this->page_no + 1;


            if ($this->page_no > $this->total_no_of_pages ) {
                $this->page_no = 1;
            }

            $this->filter['offset'] =  $offset;
            $this->filter['recperpage'] =  $total_records_per_page;

            return GiglogAdmin_Concert::find_concerts($this->filter);
        }

        private function get_filter(string $f) : ?string
        {
            return isset( $this->filter[$f] ) ? $this->filter[$f] : null;
        }

        private function render_pagination() : string
        {
            $content =
                '<div id="pagtextbox" style="display:flex">'
                . '<span class="alignleft" style="text-align:left;flex:auto;">';

            if($this->page_no > 1) {
                $content .=
                    '<span>'
                    . '<a href="'. add_query_arg( 'page_no', 1 ) . '">'
                    . 'First Page</a> -'
                    . '</span>'
                    . '<span>'
                    . '<a href="' . add_query_arg( 'page_no', $this->previous_page ) . '">'
                    . ' Previous</a></span>';
            }

            $content .= '</span>'
                . '<span class="aligncenter" style="text-align:center;flex:auto">'
                . '<strong>Page ' . $this->page_no . ' of ' . $this->total_no_of_pages . '</strong>'
                . '</span>';

            $content .= '<span class="alignright" style="text-align:right;flex:auto;float:none">';

            if ($this->page_no < $this->total_no_of_pages) {
                $content .=
                    '<span>'
                    . '<a href="' . add_query_arg( 'page_no', $this->next_page ) . '">'
                    . 'Next</a> - '
                    . '</span>'
                    . '<span>'
                    . '<a href="' . add_query_arg( 'page_no', $this->total_no_of_pages ) .'">'
                    . 'Last Page</a>'
                    . '</span>';
            }

            $content .=
                '</span>'
                . '</div>';

            return $content;
        }

        private function render_concerts_table() : string
        {
            $concerts = $this->get_concerts();

            $last_city = '';

            $content = $this->render_concert_table_header();

            foreach ( $concerts as $concert ) {
                $content .= '<tr class="assignitr"><td>';

                if ($last_city != $concert->venue()->city()) {
                    $content .= $concert->venue()->city();
                }

                $content .= '</td>';

                $content .=
                    "<td>" . date( 'd.M.Y', strtotime( $concert->cdate() ) ) . "</td>"
                    . "<td>" . esc_html($concert->cname()) . "</td>"
                    . "<td>" . esc_html($concert->venue()->name()) . "</td>";

                if( is_admin() ) {
                    $content .= '<td class="publishstatus">' . $this->mark_new_concert($concert) . '</td>';

                    foreach ( [ 'photo1', 'photo2', 'rev1', 'rev2' ] as $role ) {
                        $content .= '<td class="assigneduser">'
                            . $this->assign_role_for_user_form( $role, $concert )
                            . '</td>';
                    }

                    $content .= '<td>' . self::STATUS_LABELS[$concert->status()] . '</td>';

                    if (current_user_can('administrator')) {
                        $content .= "<td class=\"adminbuttons\">{$this->adminactions( $concert )}</td>";
                    }
                }
                else {
                    $content .= "<td><a target=\"_blank\" href=\"{$concert->eventlink()}\">Link</a></td>";
                    $content .= "<td><a target=\"_blank\" href=\"{$concert->tickets()}\">Tickets</a></td>";
                }

                $content .= '<td> <a href="'.get_admin_url().'admin-ajax.php?action=giglog_export_ical&evid='.$concert->id().'">iCal</td>';
                $content .= '</tr>';
                $last_city = $concert->venue()->city();
            }

            $content .= '</table>';

            $content .= $this->render_pagination();

            //from main form that includes filters
            $content .= '</div></form></p>';

            // return the table
            return $content;
        }

        private function render_filters() : string
        {
            global $wp_locale;

            $select = '<p><form method="GET" action="" class="filterclass">FILTER DATA:  ';

            foreach( $_GET as $name => $val ) {
                if ( in_array( $name, self::FILTER_KEYS ) ) {
                    continue;
                }

                $select .= '<input type="hidden" name="' . esc_attr( $name )
                    . '" value="' . esc_attr( $val ) . '">';
            }

            $cty = $this->get_filter('city');

            $select .= \EternalTerror\ViewHelpers\select_field(
                "city",
                array_map(fn($city) => [$city, $city], GiglogAdmin_Venue::all_cities()),
                $cty,
                "Select city...");

            if ( !empty($cty) ) {
                //second drop down for venue
                $select .= \EternalTerror\ViewHelpers\select_field(
                    "venue",
                    array_map(
                        fn($venue) => [$venue->id(), $venue->name()],
                        GiglogAdmin_Venue::venues_in_city($cty)
                    ),
                    $this->get_filter('venue_id'),
                    "Select venue...");
            }

            $select .= \EternalTerror\ViewHelpers\select_field(
                "month",
                array_map(
                    fn($m) => [ $m, $wp_locale->get_month( $m ) ],
                    range( 1, 12 )
                ),
                $this->get_filter('month'),
                "Select month...");

            $select.='</select>';

            if(is_admin()) {
                //option to select own concerts only
                $select .= '<input name="only_mine" class="ownconc" type="checkbox" value="1"'
                    . checked( $this->get_filter( 'current_user' ) )
                    . '><label for="ownconcerts">Show own concerts only</label>';

            }
            //NOTE that I remvoed </form></p> and mvoed them up to render_concerts_table function
            $select .= '<input class="applybutton" type="submit" value="Apply Filters">';

            return $select;
        }

        private function adminactions( GiglogAdmin_Concert $concert ) : string
        {
            return
                '<form class="adminactions" method="POST" action="">'
                . '<input type="hidden" name="nonce" value="' . $this->nonce . '">'
                . '<input type="hidden" name="cid" value="' . $concert->id() .  '" />'
                . \EternalTerror\ViewHelpers\select_field(
                    'selectstatus',
                    array_map(fn($i) => [ $i, self::STATUS_LABELS[$i] ], range(1, count(self::STATUS_LABELS) - 1)),
                    $concert->status())
                    . '<input type="submit" value="SetStatus">'
                    . '<input type="submit" name ="edit" value="EDIT">'
                    . '</form>';
        }

        /**
         * Display a mark on the concert if it is new.
         * I.e. imported/created within the last ten days.
         *
         * @return null|string
         */
        private function mark_new_concert(GiglogAdmin_Concert $concert) : string
        {
            $now = new DateTime();
            $new_entry = $now->diff($concert->created())->days <= 10;
            if ($new_entry) {
                return '<span style="color:green">NEW</span>';
            }
            else {
                return '';
            }
        }

        private function assign_role_for_user_form(string $role, GiglogAdmin_Concert $concert) : ?string
        {
            $roles = $concert->roles();
            $assigned_user = array_key_exists($role, $roles) ? $roles[$role] : NULL;

            //first check if current slot is taken by current user
            if ( $assigned_user == $this->username ) {
                $f = '<form class="unassign_concert" method="POST" action="">'
                    . '  <input type="hidden" name="nonce" value="' . $this->nonce . '">'
                    . '  <input type="hidden" name="cid" value="' . $concert->id() . '" />'
                    . '  <input type="hidden" name="pid" value="' . $role . '" />'
                    . '  <input type="submit" name="unassignitem" value=""/>'
                    . '</form>';
            }
            elseif ( $assigned_user ) { //check if slot is taken by another user
                $f = '<span class="takenby">Taken</span>'
                    . '<div class="takenby">Taken by ' . $assigned_user . '</div>';
            }
            elseif ( array_search($this->username, $roles) ) {
                // other slots for this concert are taken by user
                $f = '<span class="taken_by_self">-</span>';
            }
            else { //not taken by anyone
                $f = '<form class="assign_concert" method="POST" action="">'
                    . '  <input type="hidden" name="nonce" value="' . $this->nonce . '">'
                    . '  <input type="hidden" name="cid" value="' . $concert->id() . '" />'
                    . '  <input type="hidden" name="pid" value="' . $role. '" />'
                    . '  <input  type="submit" name="assignitem" value=""/>'
                    . '</form>';
            }

            return $f;
        }
    }
}