<?php
define("DUPLICATE_NAME_IN_SAME_GROUP", true);

// kiolvassa a választható emberek listáját
function read_electable_people(string $fname): array
{
    $s = file_get_contents($fname);

    // szétszedés csoportnév-csoporttag sorozatra
    $group_name_seq = preg_split("/(\*\*)|(__)/", trim($s), -1, PREG_SPLIT_NO_EMPTY);

    // csoportok feldolgozása egyenként
    $ep = [];
    for ($i = 0; $i < count($group_name_seq); $i += 2) {
        $group = trim($group_name_seq[$i]); // csoport kiolvasása
        $names = preg_split("/(\n)|(\r\n)/", trim($group_name_seq[$i + 1]), -1, PREG_SPLIT_NO_EMPTY); // nevek a csoportból

        foreach ($names as $name) {
            if (trim($name) === "") { // üres sorokat átugorja
                continue;
            }
            $new_rec = ["name" => $name, "group" => $group];
            if (DUPLICATE_NAME_IN_SAME_GROUP || !in_array($new_rec, $ep)) {
                $ep[] = $new_rec;
            }
        }
    }


    return $ep;
}

define("MINIMUM_NEEDLE_LENGTH", 3);
define("HIDE_GROUP_OF_NON_DUPLICATES", true);

// keresés a nevek között
function search_in_names(array $records, string $needle, string $group = "", bool $show_only_exact_match = false,
                         bool  $hide_groups_of_non_duplicates = HIDE_GROUP_OF_NON_DUPLICATES): array
{
    // keresés
    $needle = trim($needle);

    if (strlen($needle) < MINIMUM_NEEDLE_LENGTH) {
        return [];
    }

    $exact_match = [];
    $hitpos_array = [];

    $filter = function (array $var) use (&$hitpos_array, &$exact_match, $needle, $group, $show_only_exact_match): bool {
        // ha a csoporton belül keres
        if ($group !== "" && strtolower($var["group"]) !== strtolower($group)) {
            return false;
        }

        $hitpos = iconv_strpos(strtolower($var["name"]), strtolower($needle));

        // pontos egyezés vizsgálata (hossz és kezdőindex vizsgálata)
        if ($show_only_exact_match && ($hitpos != 0 || strlen($var["name"]) !== strlen($needle))) {
            $hitpos = false;
        }

        // ha van egyezés...
        if ($hitpos !== false) {
            $hitpos_array[] = $hitpos;

            // megvizsgálja, hogy exact egyezés van-e?
            $exact_match[] = $var["name"] === $needle;
        }

        return $hitpos !== false;
    };

    $filter_res = array_values(array_filter($records, $filter));

    if (count($filter_res) > 0) {
        for ($i = 0; $i < count($filter_res); $i++) {
            $filter_res[$i]["hitpos"] = $hitpos_array[$i];
            $filter_res[$i]["exact_match"] = $exact_match[$i];
            $filter_res[$i]["duplicate"] = false;
        }
    }

    if ($hide_groups_of_non_duplicates) {
        // nevek rendezése hossz szerint (substr gyorsítása n*(n-1)-ről (n-1)+(n-2)+(n-3)... vizsgálatra)
        usort($filter_res, fn($a, $b) => strlen($a["name"]) - strlen($b["name"]));

        // ha a név nem szerepel több, mint egyszer, akkor a csoportot törli (security reasons)
        for ($i = 0; $i < count($filter_res); $i++) {
            if ($filter_res[$i]["duplicate"]) {
                continue;
            }

            $name_needle = $filter_res[$i]["name"]; // név, amit keresünk a többiben
            $is_duplicate = false;
            for ($j = $i + 1; $j < count($filter_res); $j++) {
                // ha van találat, akkor kiugrunk a keresésből
                if (stripos($filter_res[$j]["name"], $name_needle) !== false) {
                    $filter_res[$j]["duplicate"] = true;
                    $is_duplicate = true;
                    break;
                }
            }

            $filter_res[$i]["duplicate"] = $is_duplicate;
        }

        // csoport törlése azokból a nevekből, amikből nem szerepel több
        for ($i = 0; $i < count($filter_res); $i++) {
            if (!$filter_res[$i]["duplicate"]) {
                $filter_res[$i]["group"] = "";
            }
        }
    }

    // rendezés abc-rendbe
    usort($filter_res, fn($a, $b) => $a["name"] > $b["name"]);

    return $filter_res;
}

// hozzáillesztés és sorok felcserélése
function append_and_shuffle(string $filename, string $str)
{
    $file_contents = file_get_contents($filename, $str); // betöltés
    $file_contents = ($file_contents === false) ? $str : ($file_contents . $str); // új adat hozzáadása
    $lines = explode("\n", $file_contents); // szétszedés soronként
    $lines_trimmed = []; // üres sorok kihagyása
    foreach ($lines as $line) {
        $lt = trim($line);
        if ($lt !== "") {
            $lines_trimmed[] = $lt;
        }
    }
    shuffle($lines_trimmed); // sorok felcserélése
    $file_contents = implode("\n", $lines_trimmed) . "\n"; // összeállítás egy stringbe
    return file_put_contents($filename, $file_contents); // mentés
}

define("DATA_DIR", "data");
define("LOGIN_ID_FILE_NAME", "electors_masked.md");
define("VOTE_FILENAME", "votes.dat");
define("VOTE_COUNT_FILENAME", "vote_count.dat");
define("USED_ELECTOR_HASH_FILENAME", "electors_submitted_vote.dat");
define("VOTE_STATE_FILENAME", "vote_state.json");
define("VOTE_TIMESTAMP_FILENAME", "vote_timestamps.dat");

function submit_name(string $name, string $group, string $elector_id)
{
    // default...
    $ret = [
        "successful" => false,
        "index" => -1
    ];

    // ---------------

    $used_hash_filename = DATA_DIR . DIRECTORY_SEPARATOR . USED_ELECTOR_HASH_FILENAME;
    $votes_filename = DATA_DIR . DIRECTORY_SEPARATOR . VOTE_FILENAME;
    $vote_count_filename = DATA_DIR . DIRECTORY_SEPARATOR . VOTE_COUNT_FILENAME;
    $timestamp_filename = DATA_DIR . DIRECTORY_SEPARATOR . VOTE_TIMESTAMP_FILENAME;

    // ---------------

    // kölcsönös kizárás a számláló fájllal
    $fp = fopen($vote_count_filename, "r+");
    flock($fp, LOCK_EX); // kölcsönös kizárás

    // megvizsgáljuk, hogy szavazhat-e a felhasználó
    $used_elector_hashes = file_get_contents($used_hash_filename);
    $elector_hash = sha1($elector_id);
    if (strpos($used_elector_hashes, sha1($elector_id)) === false) { // ha szavazhat...
        // személy kikeresése
        $p = read_electable_people(ELECTABLE_PEOPLE_DATABASE);
        $hits = search_in_names($p, $name, $group, true, false);

        // ha egzakt találat van, azaz a szavazó megfelelő nevet adott meg
        if (count($hits) === 1) {
            // felhasználó azonosítójának beírása a felhasznált hash-ek jegyzékébe
            copy($used_hash_filename, "$used_hash_filename.prev");
            $hash_save_successful = append_and_shuffle($used_hash_filename, "$elector_hash\n") !== false;

            // szavazat mentése
            $name = $hits[0]["name"];
            $group = $hits[0]["group"];
            $record = "$name//$group\n";
            copy($votes_filename, "$votes_filename.prev");
            $vote_save_successful = append_and_shuffle($votes_filename, $record) !== false;

            // időbélyeg mentése
            copy($timestamp_filename, "$timestamp_filename.prev");
            $timestamp = date("Y-m-d H:i:s");
            $timestamping_successful = file_put_contents($timestamp_filename, "$timestamp\n", FILE_APPEND) !== false;

            $success = $hash_save_successful && $vote_save_successful && $timestamping_successful;

            if ($success) { // ha sikeres minden...
                // szavazatszám növelése
                $cnt = (int)(fread($fp, 255));
                $cnt++;
                $ret["index"] = $cnt;
                fseek($fp, 0);
                fwrite($fp, $cnt);
            } else { // ha valamelyik nem sikerül, akkor visszaállunk a korábbi állapotba
                rename($used_hash_filename, "$used_hash_filename.err_" . time()); // hibás fájl eltárolása
                rename($votes_filename, "$votes_filename.err_" . time());
                rename($timestamp_filename, "$timestamp_filename.err_" . time());
                copy("$used_hash_filename.prev", $used_hash_filename); // régi állapot visszaállítása
                copy("$votes_filename.prev", $votes_filename);
                copy("$timestamp_filename.prev", $timestamp_filename);
            }

            $ret["successful"] = $success;
        }
    }

    fclose($fp); // lock elengedése és fájl bezárása

    return $ret;
}

// név és csoport szétválasztása (NEM UGYANAZ, MINT JS-ben!)
function fetch_name_and_group(string $compound): array
{
    $parts = explode("//", $compound);
    return ["name" => $parts[0], "group" => $parts[1]];
}

// állapotfájl előállítása, ha nem létezik
function load_state()
{
    $vote_state_fname = DATA_DIR . DIRECTORY_SEPARATOR . VOTE_STATE_FILENAME;
    $state = [];
    if (!file_exists($vote_state_fname)) {
        $state = [
            "state" => "closed",
            "open_for_submit" => false,
            "auto_manage" => false,
            "open_date" => "2022-08-01 08:00:00",
            "close_date" => "2022-08-01 20:00:00",
            "results_public" => false,
            "public_results_plot_filename" => "",
            "public_results_plot_filename_mobile" => ""
        ];
    } else {
        $state = json_decode(file_get_contents($vote_state_fname), true);
    }

    return $state;
}

function save_state($state)
{
    file_put_contents(DATA_DIR . DIRECTORY_SEPARATOR . VOTE_STATE_FILENAME, json_encode($state, JSON_PRETTY_PRINT));
}

// jelentés generálása
function generate_report($omit_votes = true)
{
    $state = load_state();
    $elector_hashes = explode("\n", file_get_contents(DATA_DIR . DIRECTORY_SEPARATOR . LOGIN_ID_FILE_NAME));
    $total_elector_count = 0;
    foreach ($elector_hashes as $elector_hash) {
        if (trim($elector_hash) !== "") {
            $total_elector_count++;
        }
    }

    $vote_list_str = file_get_contents(DATA_DIR . DIRECTORY_SEPARATOR . VOTE_FILENAME);
    $vote_list = explode("\n", $vote_list_str);
    $votes_grouped = [];
    $total_votes = 0;
    foreach ($vote_list as $vote) {
        // üres sorok kihagyása
        if (strlen(trim($vote)) === 0) {
            continue;
        }

        $votes_grouped[$vote] = (($votes_grouped[$vote]) ?? 0) + 1;
        $total_votes++;
    }

    // rendezés szavazatok száma alapján
    uasort($votes_grouped, fn($a, $b) => ($b - $a));

    // név és csoport szétválasztása
    $votes_structured = [];
    foreach ($votes_grouped as $id_compound => $vote_cnt) {
        $expl_vote = fetch_name_and_group($id_compound);
        $votes_structured[$expl_vote["name"]] = ["name" => $expl_vote["name"], "group" => $expl_vote["group"], "count" => $vote_cnt, "ratio" => ($vote_cnt / $total_votes)];
    }

    $report = [
        "total_votes" => $total_votes,
        "total_electors" => $total_elector_count,
        "state" => $state
    ];

    if (!$omit_votes) {
        $report["records"] = array_values($votes_structured);
    }

    return $report;
}

function RGBToHSLV($r, $g, $b, bool $hsv = false)
{
    $r /= 255;
    $g /= 255;
    $b /= 255;

    $x_max = max($r, $g, $b);
    $x_min = min($r, $g, $b);
    $c = $x_max - $x_min;

    $l = ($x_max + $x_min) / 2;

    $h = 0;
    if ($c === 0) {
        $h = 0;
    } else if ($x_max === $r) {
        $h = 60 * ($g - $b) / $c;
    } else if ($x_max === $g) {
        $h = 60 * (2 + ($b - $r) / $c);
    } else if ($x_max === $b) {
        $h = 60 * (4 + ($r - $g) / $c);
    }

    if ($hsv) {
        $s = (($x_max === 0)) ? 0 : ((float)$c / $x_max);
        return [$h, $s, $x_max];
    } else {
        $s = (($l === 0) || ($l === 1)) ? 0 : (2 * ($x_max - $l) / (1 - abs(2 * $l - 1)));
        return [$h, $s, $l];
    }

}

function HSVtoRGB($h, $s, $v)
{
    $c = $v * $s;
    $h_ = $h / 60;
    $x = $c * (1 - abs(fmod($h_, 2) - 1));

    $rgb1 = [0, 0, 0];
    if ($h_ >= 0 && $h_ < 1) {
        $rgb1 = [$c, $x, 0];
    } else if ($h_ >= 1 && $h_ < 2) {
        $rgb1 = [$x, $c, 0];
    } else if ($h_ >= 2 && $h_ < 3) {
        $rgb1 = [0, $c, $x];
    } else if ($h_ >= 3 && $h_ < 4) {
        $rgb1 = [0, $x, $c];
    } else if ($h_ >= 4 && $h_ < 5) {
        $rgb1 = [$x, 0, $c];
    } else if ($h_ >= 5 && $h_ < 6) {
        $rgb1 = [$c, 0, $x];
    }

    $m = $v - $c;
    $rgb = [$rgb1[0] + $m, $rgb1[1] + $m, $rgb1[2] + $m];

    return $rgb;
}

function RGBtoHex($r, $g, $b)
{
    $r_str = dechex($r);
    $g_str = dechex($g);
    $b_str = dechex($b);

    $r_str = (strlen($r_str) === 1) ? "0$r_str" : $r_str;
    $g_str = (strlen($g_str) === 1) ? "0$g_str" : $g_str;
    $b_str = (strlen($b_str) === 1) ? "0$b_str" : $b_str;

    return "#$r_str$g_str$b_str";
}

//function RGBtoHCL($r, $g, $b)
//{
//
//}

define("SVG_REPORT_WIDTH", 700);
define("SVG_REPORT_HEIGHT", 350);
define("SVG_REPORT_STROKE_WIDTH", 30);
define("SVG_REPORT_LEGEND_MARK_SIZE", 20);
define("SVG_REPORT_HIGHLIGHT_STROKE_WIDTH", 40);
define("SVG_REPORT_PLOT_THRESHOLD_PERCENT", 5);
define("SVG_REPORT_LEGEND_FONT_SIZE", 20);
define("SVG_REPORT_START_COLOR", "003F5C");
define("SVG_REPORT_END_COLOR", "F89A17");
define("SVG_REPORT_PIE_RADIUS", 110);
define("SVG_REPORT_ANIMATION_DUR", 2);

// SVG-kép generálása a jelentésből
function generate_svg_plot($report, $mobile = false): string
{
    $pie_orig = [SVG_REPORT_WIDTH / 2, SVG_REPORT_HEIGHT / 2];
    $pie_radius = SVG_REPORT_PIE_RADIUS;
    $cum_percent = 0;
    $legend_font_size = SVG_REPORT_LEGEND_FONT_SIZE;

    $last_segment_midpoint = [0, 0];
    $last_segment_midpoint_angle = 0;

    // százalékértéknyi körív rajzolása
    $svg_curve = function ($percent) use (&$cum_percent, $pie_radius, $pie_orig, &$last_segment_midpoint, &$last_segment_midpoint_angle) {
        $x_rot = $cum_percent / 100.0 * 360; // x-tengely forgatása

        $start_angle = -$cum_percent / 100.0 * 2 * M_PI; // radián
        $end_angle = -($cum_percent + $percent) / 100.0 * 2 * M_PI; // radián
        $middle_point_angle = -($cum_percent + $percent / 2); // fok

        $start_x = $pie_orig[0] + cos($start_angle) * $pie_radius;
        $start_y = $pie_orig[1] + sin($start_angle) * $pie_radius;

        $end_x = $pie_orig[0] + cos($end_angle) * $pie_radius;
        $end_y = $pie_orig[1] + sin($end_angle) * $pie_radius;

        $last_segment_midpoint[0] = $pie_orig[0] + cos($middle_point_angle / 100.0 * 2 * M_PI) * $pie_radius;
        $last_segment_midpoint[1] = $pie_orig[1] + sin($middle_point_angle / 100.0 * 2 * M_PI) * $pie_radius;
        $last_segment_midpoint_angle = $middle_point_angle * 3.6;

        $cum_percent += $percent;
        return "M $start_x $start_y
        A $pie_radius $pie_radius $x_rot 0 0 $end_x $end_y\n";
    };

    // kurzor mozgatása
    $svg_move_cursor = function ($x, $y) {
        return "M $x $y\n";
    };

    // útvonal generálása
    $svg_path = function ($d, $color, $id, $class = "sector", $stroke_width = SVG_REPORT_STROKE_WIDTH) {
        return "<path id='$id' d='$d' stroke='$color' fill='none' stroke-width='$stroke_width' class='$class' />\n";
    };

    // jelmagyarázat generálása
    $svg_legend = function ($color, $text, $x, $y, $mark_size = SVG_REPORT_LEGEND_MARK_SIZE) use ($legend_font_size, $pie_orig, $mobile) {
        $rect_x = $x;
        $rect_y = $y;
        $circ_radius = $mark_size / 2;
        $anchor_cond = ($x > $pie_orig[0] || $mobile);
        $text_x_offset_sign = $anchor_cond ? 1 : -1;
        $text_anchor = $anchor_cond ? "start" : "end";
        $text_x = $x + $text_x_offset_sign * ($circ_radius + 0.5 * $legend_font_size);
        $text_y = $y; // + ($mark_size - 0.4 * $legend_font_size) / 2;

        //return "<rect x='$rect_x' y='$rect_y' width='$mark_size' height='$mark_size' fill='$color' rx='4' />
        return "<circle cx='$rect_x' cy='$rect_y' r='$circ_radius' fill='$color' cursor='pointer'/>
                <text class='legend' x='$text_x' y='$text_y' text-anchor='$text_anchor'>$text</text>\n";
    };

    // színpaletta előállítása
    $generate_palette = function ($start_hex, $end_hex, $cnt): array {
        if (gettype($start_hex) === "string") {
            $start_hex = hexdec($start_hex);
        }
        if (gettype($end_hex) === "string") {
            $end_hex = hexdec($end_hex);
        }

        // szétválasztás komponensekre
        $start_rgb = [($start_hex & 0xFF0000) >> 16, ($start_hex & 0x00FF00) >> 8, ($start_hex & 0x0000FF)];
        $end_rgb = [($end_hex & 0xFF0000) >> 16, ($end_hex & 0x00FF00) >> 8, ($end_hex & 0x0000FF)];

        $start_hsv = RGBToHSLV($start_rgb[0], $start_rgb[1], $start_rgb[2], true);
        $end_hsv = RGBToHSLV($end_rgb[0], $end_rgb[1], $end_rgb[2], true);

        // mindig a hosszabb görbe választása
        $hue_diff = $end_hsv[0] - $start_hsv[0];
        if (abs($hue_diff) < 180) {
            $start_hsv[0] -= 360;
        }

        // interpoláció
        $step = [($end_hsv[0] - $start_hsv[0]) / ($cnt - 1),
            ($end_hsv[1] - $start_hsv[1]) / ($cnt - 1),
            ($end_hsv[2] - $start_hsv[2]) / ($cnt - 1)];

        $palette = [];
        for ($i = 0; $i < $cnt; $i++) {
            $hue = $start_hsv[0] + $step[0] * $i % 360;
            $hue += ($hue < 0) ? 360 : 0;
            $color = [$hue, $start_hsv[1] + $step[1] * $i, $start_hsv[2] + $step[2] * $i];
            $color_rgb = HSVtoRGB($color[0], $color[1], $color[2]);
            //$palette[] = "hsl(" . (floor($color[0])) . "," . (floor($color[1])) . "%," . (floor($color[2])) . "%)";
            //$palette[] = "rgb(" . (round($color_rgb[0] * 255)) . "," . (round($color_rgb[1] * 255)) . "," . (round($color_rgb[2] * 255)) . ")";
            $palette[] = RGBtoHex((round($color_rgb[0] * 255)), (round($color_rgb[1] * 255)), (round($color_rgb[2] * 255)));
        }

        return $palette;
    };

    // -------------------

    // küszöbérték feletti blokkok számának meghatározása
    $sector_count = 0;
    foreach ($report["records"] as $record) {
        $sector_count++;
        if ($record["ratio"] * 100.0 < SVG_REPORT_PLOT_THRESHOLD_PERCENT) {
            break;
        }
    }

    // színpaletta előállítása
    $palette = $generate_palette(SVG_REPORT_START_COLOR, SVG_REPORT_END_COLOR, $sector_count);
    //$palette = [ "#003f5c", "#424d83", "#8e5092", "#d24f81", "#fa6756", "#f89a17" ];

    // svg-kép előállítása
    $svg = "";

    // stíluslap hozzáadása
    $hlsw = SVG_REPORT_HIGHLIGHT_STROKE_WIDTH;
    $animdur = SVG_REPORT_ANIMATION_DUR;
    $svg .= "<style>
        @import url('https://fonts.googleapis.com/css2?family=Faustina'); 
        .legend { font-family: 'Faustina', serif; font-size: ${legend_font_size}px; dominant-baseline: middle; cursor: pointer; }
        .sector { cursor: pointer; }
        .sector:hover { stroke-width: ${hlsw}px }
        .sectorlabel { font-family: 'Faustina', serif; fill: white; text-anchor: middle; dominant-baseline: middle; cursor: pointer; }
        g.datagroup { animation: fadeIn ${animdur}s forwards; opacity: 0; }
        g.datagroup:hover .sector { stroke-width: ${hlsw}px; }
        @keyframes fadeIn {
            0% { opacity: 0 }
            100% { opacity: 1 }        
        }
        </style>";

    $total = $report["total_votes"];
    $last_legend_anchor = [];
    foreach ($report["records"] as $idx => $record) {
        // kördiagram cikkei
        $percent = $record["count"] * 100.0 / $total;
        $joined_sector = $percent < SVG_REPORT_PLOT_THRESHOLD_PERCENT; // az küszöbérték alatti szavaztokat egybe gyűjtjük
        if ($joined_sector) {
            $percent = 100.0 - $cum_percent; // az összes maradék helyet kitöltjük
        }

        //$color = "rgb(" . random_int(0, 255) . "," . random_int(0, 255) . "," . random_int(0, 255) . ")";
        $color = $palette[$idx];

        $anim_delay = SVG_REPORT_ANIMATION_DUR * 2 / 3 * ($sector_count - $idx - 1);
        $svg .= "<g class='datagroup' style='animation-delay: ${anim_delay}s' id='datagroup${idx}'>";
        $sector_id = "sector$idx";
        $svg .= $svg_path($svg_curve($percent), $color, "$sector_id"); // körcikk
        $svg .= "<text><textPath class='sectorlabel' href='#$sector_id' startOffset='50%'>" // szöveg rajta
            . number_format((float)$percent, 1, ',', '') .
            "%</textPath></text>\n";

        // jelmagyarázat
        $legend_anchor = [];
        if (!$mobile) { // normál megjelenítés
            $legend_anchor = $pie_orig;
            $legend_anchor[0] += ($last_segment_midpoint[0] - $pie_orig[0]) * (1 + 1.2 * SVG_REPORT_STROKE_WIDTH / $pie_radius);
            $legend_anchor[1] += ($last_segment_midpoint[1] - $pie_orig[1]) * (1 + 1.2 * SVG_REPORT_STROKE_WIDTH / $pie_radius);
        } else { // mobilos megjelenítés
            $legend_anchor[0] = $pie_orig[0] - SVG_REPORT_PIE_RADIUS;
            $legend_anchor[1] = $pie_orig[1] + SVG_REPORT_PIE_RADIUS + SVG_REPORT_HIGHLIGHT_STROKE_WIDTH * 1.5 + 1.5 * $legend_font_size * $idx;
        }

        if (!$joined_sector) {
            $legend_text = "${record['name']} (${record['count']})";
        } else {
            $legend_text = "Többiek";
        }
        $svg .= $svg_legend($color, $legend_text, $legend_anchor[0], $legend_anchor[1]);
        $svg .= "</g>";

        $last_legend_anchor = $legend_anchor;

        if ($joined_sector) {
            break;
        }
    }

    // viewBox beállítása
    $viewBox = [];
    if (!$mobile) { // asztali kép
        $viewBox = "0 0 " . SVG_REPORT_WIDTH . " " . SVG_REPORT_HEIGHT;
        $style = "style='width: " . SVG_REPORT_WIDTH . "px;'";
    } else { // mobilos kép
        $vBx = SVG_REPORT_WIDTH / 2 - (SVG_REPORT_PIE_RADIUS + SVG_REPORT_HIGHLIGHT_STROKE_WIDTH + 1);
        $vBy = SVG_REPORT_HEIGHT / 2 - (SVG_REPORT_PIE_RADIUS + SVG_REPORT_HIGHLIGHT_STROKE_WIDTH + 1);
        $vBw = (SVG_REPORT_PIE_RADIUS + SVG_REPORT_HIGHLIGHT_STROKE_WIDTH) * 2;
        $vBh = $last_legend_anchor[1] + 2 * $legend_font_size;
        $viewBox = "$vBx $vBy $vBw $vBh";
        $style = "";
    }

    $svg = "<svg viewBox='$viewBox' xmlns='http://www.w3.org/2000/svg' $style>" . $svg;


    $svg .= "</svg>";

    return $svg;
}

// azonosító ellenőrzése
function verify_id($id)
{
    if (trim($id) === "") {
        return ["valid" => false, "used" => false];
    }
    $ids = file_get_contents(DATA_DIR . DIRECTORY_SEPARATOR . LOGIN_ID_FILE_NAME);
    $used_hashes = file_get_contents(DATA_DIR . DIRECTORY_SEPARATOR . USED_ELECTOR_HASH_FILENAME);
    $needle = sha1($id) . "\n"; // teljes sort kersünk, mert különben elég lenne egy részét ismerni az adatnak
    $id_valid = strpos($ids, $needle) !== false;
    $id_used = strpos($used_hashes, $needle) !== false;
    return ["valid" => $id_valid, "used" => $id_used];
}

// --------------------------------

define("CP_LOGIN_ID_FILENAME", "cp_login_hashes.dat");

// Vezérlőpult kezelése

// bejelentkezés a vezérlőpultba
function cp_verify_id($id)
{
    if (trim($id) === "") {
        return false;
    }
    $ids = file_get_contents(DATA_DIR . DIRECTORY_SEPARATOR . CP_LOGIN_ID_FILENAME);
    return strpos($ids, sha1($id) . "\n") !== false;
}

define("STATE_LOCK_FILENAME", "state.lock");
define("PUBLIC_DIR", "public");
define("FULL_RESULT_RECORDS_FILENAME", "full_results.json");

// szavazásállapot módosítása
function cp_modify_state($command)
{
    $fp = fopen(DATA_DIR . DIRECTORY_SEPARATOR . STATE_LOCK_FILENAME, "w");
    flock($fp, LOCK_EX);

    $state = load_state();
    switch ($command) {
        case "open_election":
            $state["state"] = "open";
            break;
        case "close_election":
            $state["state"] = "closed";
            break;
        case "enable_submitting":
            $state["open_for_submit"] = true;
            break;
        case "disable_submitting":
            $state["open_for_submit"] = false;
            break;
        case "publish_results":
            {
                // grafikon rajzolása
                $state["results_public"] = true;
                $uniqid = uniqid();
                $plot_filename_normal = PUBLIC_DIR . DIRECTORY_SEPARATOR . "results_$uniqid.svg";
                $plot_filename_mobile = PUBLIC_DIR . DIRECTORY_SEPARATOR . "m_results_$uniqid.svg";
                $report = generate_report(false);
                $svg_normal = generate_svg_plot($report);
                file_put_contents($plot_filename_normal, $svg_normal);
                $svg_mobile = generate_svg_plot($report, true);
                file_put_contents($plot_filename_mobile, $svg_mobile);
                $state["public_results_plot_filename"] = $plot_filename_normal;
                $state["public_results_plot_filename_mobile"] = $plot_filename_mobile;

                // szavazat-eredmények mentése
                $records_without_group = [];
                foreach ($report["records"] as $record) { // csoport törlése (privacy and like that)
                    $records_without_group[] = ["name" => $record["name"], "count" => $record["count"], "ratio" => $record["ratio"]];
                }
                file_put_contents(PUBLIC_DIR . DIRECTORY_SEPARATOR . FULL_RESULT_RECORDS_FILENAME, json_encode($records_without_group));
            }
            break;
        case "unpublish_results":
            $state["results_public"] = false;
            unlink($state["public_results_plot_filename"]);
            unlink($state["public_results_plot_filename_mobile"]);
            $state["public_results_plot_filename"] = "";
            $state["public_results_plot_filename_mobile"] = "";
            break;
    }
    save_state($state);

    fclose($fp);

    return $state;
}

define("TEMPDIR", "temp");

// jelentés előállítása csv-ként
function generate_csv_report($report)
{
    $csv_report_filename = TEMPDIR . DIRECTORY_SEPARATOR . uniqid("report_") . ".csv";

    $csvfp = fopen($csv_report_filename, "w");
    if ($csvfp === false) {
        return false;
    }

    // fejléc mentése
    $header = ["Név", "Csoport", "Szavazatok", "Arány", "Össz_szavazat", "Össz_szavazó", "Részv_arány"];
    fputcsv($csvfp, $header);

    // első sor mentése
    $records = $report["records"];
    if (count($records) === 0) { // egy sort legalább hozzáadunk
        $records[0] = ["name" => "", "group" => "", "count" => "", "ratio" => ""];
    }
    $total_votes = $report["total_votes"];
    $total_electors = $report["total_electors"];
    $firstLine = [$records[0]["name"], $records[0]["group"], $records[0]["count"], number_format($records[0]["ratio"] * 100, 2) . "%",
        $total_votes, $total_electors, number_format($total_votes / $total_electors * 100, 2) . "%"];
    fputcsv($csvfp, $firstLine);

    // többi sor mentése
    for ($i = 1; $i < count($records); $i++) {
        $records[$i]["ratio"] = number_format($records[$i]["ratio"] * 100, 2) . "%";
        fputcsv($csvfp, $records[$i]);
    }

    fclose($csvfp);

    return $csv_report_filename;
}

function cp_add_access_code(string $ac) {
    $hash = sha1($ac);
    file_put_contents(DATA_DIR . DIRECTORY_SEPARATOR . LOGIN_ID_FILE_NAME, "$hash\n", FILE_APPEND);
}

// --------------------------------

define("ELECTABLE_PEOPLE_DATABASE", "data/electable_people.md");

$action = json_decode($_POST["action"]) ?? "none";
$req_data = json_decode($_POST["data"] ?? "[]", true);

$res = "";
$disable_jsoning = false;

// Belépés nélküli feldolgozás, ha nem sikerül, akkor processed = false;
$processed = true;
switch ($action) {
    case "login":
        {
            $elector_id = $req_data["elector_id"] ?? "";
            $res = verify_id($elector_id);
            if ($res["valid"]) {
                $state = load_state();
                $res["open"] = $state["state"] === "open";
                if ($res["open"]) {
                    $res["open_for_submit"] = $state["open_for_submit"];
                    $res["results_public"] = $state["results_public"];
                }
            } else if (cp_verify_id($elector_id)) { // megnézzük, hogy admin-e, ha igen, akkor a szavazás indítása előtt beléphet
                $res["valid"] = true;
                $res["used"] = false;
                $state = load_state();
                $res["open"] = $state["state"] === "open";
                $res["open_for_submit"] = true;
                $res["results_public"] = false;
            }
        }
        break;
    case "cp_login":
        {
            $cp_id = $req_data["cp_id"] ?? "";
            $res = cp_verify_id($cp_id);
        }
        break;
    default:
        $processed = false;
        break;
}

// ha feldolgozta, akkor ugrás a végére (inkább a goto, mint 46 zárójel... :D)
if ($processed) {
    goto exit_point; // --->
}

// Belépéses (azonosítóhoz kötött) feldolgozás
$elector_id = json_decode($_POST["elector_id"] ?? "");
$state = load_state();
$admin_login = cp_verify_id($elector_id);
if (((verify_id($elector_id)["valid"]) || $admin_login) && $state["state"] === "open") {
    $processed = true;
    switch ($action) {
        case "search":
            {
                if (!$state["open_for_submit"] && !$admin_login) {
                    break;
                }

                $needle = $req_data["needle"] ?? "";
                $group = $req_data["group"] ?? "";
                $p = read_electable_people(ELECTABLE_PEOPLE_DATABASE);
                $hits = search_in_names($p, $needle, $group);
                $res = $hits;
            }
            break;
        case "submit":
            {
                if (!$state["open_for_submit"] && !$admin_login) {
                    break;
                }

                $name = $req_data["needle"] ?? "";
                $group = $req_data["group"] ?? "";
                $res = submit_name($name, $group, $elector_id);
            }
            break;
        case "results":
            {
                $mobile = $req_data["mobile"] ?? false;
                $state = load_state();
                $res = ["available" => $state["results_public"]];
                if ($state["results_public"]) {
                    $res["plot_url"] = $mobile ? $state["public_results_plot_filename_mobile"] : $state["public_results_plot_filename"];
                    $res["details"] = json_decode(file_get_contents(PUBLIC_DIR . DIRECTORY_SEPARATOR . FULL_RESULT_RECORDS_FILENAME), true);
                }
            }
            break;
        case "none":
            break;
        default:
            $processed = false;
            break;
    }
}

if ($processed) {
    goto exit_point;
}

// Control panel parancsok
$processed = true;
$elector_id = json_decode($_POST["cp_id"] ?? "");
if (cp_verify_id($elector_id)) {
    switch ($action) {
        case "cp_short_info":
            {
                $res = generate_report(true); // az összesített szavazatokat hagyja ki!
            }
            break;
        case "cp_mod_state":
            {
                $command = $req_data["command"];
                $res = cp_modify_state($command);
            }
            break;
        case "cp_generate_plot":
            {
                $disable_jsoning = true;
                $res = generate_svg_plot(generate_report(false));
            }
            break;
        case "cp_csv_report":
            {
                $report = generate_report(false); // teljes jelentés generálása
                $res = generate_csv_report($report); // csv generálása
            }
            break;
        case "cp_add_access_code":
            {
                $ac = $req_data["access_code"] ?? "";
                if ($ac !== "") {
                    cp_add_access_code($ac);
                }
            }
            break;
        default:
            $processed = false;
            break;
    }
}

exit_point:
echo $disable_jsoning ? $res : json_encode($res);

//$p = read_electable_people("data/electable_people.md");

return;