SWDB/application/helper/HTML_Helper.php

<?php
/**
 * HTML helper file.
 *
 * Provides a helper to perform HTML operations.
 *
 * @author Iñigo Valentin <i@inigovalentin.com>
 * @license https://www.gnu.org/licenses/gpl-3.0.en.html GNU General Public License V3
 * @package SWDB
 */

require_once(PATH::HELPER . "Helper.php");
require_once(PATH::ENTITY . "Unit.php");
require_once(PATH::ENTITY . "Monster.php");
require_once(PATH::ENTITY . "Building.php");
require_once(PATH::ENTITY . "Buildable.php");
require_once(PATH::ENTITY . "Decoration.php");
require_once(PATH::ENTITY . "Decorative.php");
require_once(PATH::ENTITY . "Rune.php");
require_once(PATH::ENTITY . "Artifact.php");
require_once(PATH::ENTITY . "Enchantment.php");
require_once(PATH::ENTITY . "Item.php");

/**
 * HTML helper.
 *
 * Contains utilities to parse and format HTML and to build elements.
 *
 * @category Helper.
 */
final class HTML extends Helper{

    /**
     * Escapes HTML characters
     * 
     * Alias for htmlspecialchars([input], ENT_QUOTES)
     *
     * @param string $input Text to escape.
     * @return string Escaped text.
     */
    public static function e($input){
       return htmlspecialchars($input, ENT_QUOTES);
    }

    /**
     * Generates a unit panel.
     * 
     * @param Unit|Monster Entity to get the info from.
     * @return string HTML content for a monster panel. Empty on error.
     */
    public static function unit_panel($unit) {
        if ($unit instanceof Unit){
            $k = $unit->get_monster();
            $stars = $unit->get_stars();
            $level = true;
            $teams = (sizeof($unit->get_teams()) > 0);
            $lock = $unit->is_locked();
            $storage = $unit->is_in_storage();
            $maxed = ($unit->get_level() == 40 && $unit->is_fully_skilled());
        }
        elseif ($unit instanceof Monster){
            $k = $unit;
            $stars = $unit->get_base_stars();
            $level = false;
            $teams = 0;
            $lock = false;
            $storage = false;
            $maxed = false;
        }
        else{
            return "";
        }
        $html = "";
        if ($k->get_awakens_from() == null && $k->get_awakens_to() == null){
            // No to, no from
            if ($k->get_base_stars() >= 4){
                // SFV Collab event units, always awakened.
                $star_class = "star_purple";
            }
            elseif($k->get_archetype() == ARCHETYPE_ID::MATERIAL && $k->get_element() == ELEMENT_ID::LIGHT){
                // Rainbowmon, always awakened
                $star_class = "star_purple";
            }
            elseif($k->get_archetype() == ARCHETYPE_ID::MATERIAL && $k->get_element() == ELEMENT_ID::DARK){
                // Devilmon, always unawakened
                $star_class = "star_silver";
            }
            else{
                // Unawakeable monster
                $star_class = "star_silver";
            }
        }
        elseif ($k->get_awakens_from() != ""){
            // Already awakened
            if ($k->get_base_stars() - $k->get_natural_stars() == 1){
                // Normal awaken.
                $star_class ="star_purple";
            }
            else{
                // Second awaken.
                $star_class ="star_red";
            }
        }
        elseif ($k->get_awakens_to() != ""){
            // Awakeable.
            $star_class ="star_gold";
        }
        $html .= "<span class='stars'>\n";
        for ($i = 0; $i < $stars; $i ++){
            $html .= "<img class='star $star_class' src='" . URL::IMG["ICON"] . "star.png'/>\n";
        }
        $html .= "</span>\n";
        $html .= "<img title='" . $k->get_title() . "' class='monster border_" . $k->get_element_name() . "' src='" . $k->get_image() . "'/>\n";
        if ($level){
            $html .= "<span class='level'>\n";
            $html .= $unit->get_level() . "\n";
            $html .= "</span>\n";
        }
        $html .= "<span class='badges'>\n";
        if ($maxed){
            $html .= "<img title='Maxed unit' src='" . URL::IMG["ICON"] . "maxed.png'>";
        }
        if ($teams > 0){
            $title = $teams . " teams";
            if ($teams == 1){
                $title = "1 team: " . $unit->get_teams()[0]->get_name();
            }
            $html .= "<img title='$title' src='" . URL::IMG["ICON"] . "team.png'>";
        }
        if ($lock == 1){
            $html .= "<img title='Locked' src='" . URL::IMG["ICON"] . "lock.png'>";
        }
        if ($storage){
            $html .= "<img title='In storage' src='" . URL::IMG["ICON"] . "storage.png'>";
        }

        $html .= "</span>\n";
        return $html;
    }

    /**
     * Generates a transformed monster panel.
     * 
     * @param Unit|Monster Entity to get the info from.
     * @return string HTML content for a monster panel. Empty on error.
     */
    public static function unit_transformation_panel($unit) {
        $html = "";
        if ($unit instanceof Unit){
            $k = $unit->get_unit();
        }
        elseif ($unit instanceof Monster){
            $k = $unit;
        }
        else{
            return "";
        }
        if ($k->get_transformation() == null){
            return "";
        }
        $html .= "<div class='monster_transformation_panel'>\n";
        $html .= "<img title='" . $unit->get_title() . " (transformed)' class='monster_transformation border_" . $k->get_element_name() . "' src='" . $k->get_transformation()->get_image() . "'/>\n";
        $html .= "</div>\n";
        return $html;
    }

    /**
     * Generates a rune panel.
     * 
     * @param Rune rune Entity to get the info from.
     * @param Unit unit Optional. The unit the rune is assigned to.
     * @return string HTML content for a rune panel. Empty on error.
     */
    public static function rune_panel($rune, $unit = null) {
        if (!($rune instanceof Rune)){
            return "";
        }
        $html = "";
        $html .= "<div class='rune_panel rune_slot_" . $rune->get_slot() . " rune_level_" . $rune->get_level() . " rune_quality_" . strtolower($rune->get_quality_name()) . " rune_original_quality_" . strtolower($rune->get_original_quality_name()) . " rune_ancient_" . (int) $rune->is_ancient() . "'>\n";
        $html .= "<img class='rune_base' src='" . URL::IMG["RUNE"] . "base.png'/>\n";
        $html .= "<img class='rune_icon' src='" . $rune->get_set()->get_image() . "'/>\n";
        $html .= "<span class='rune_stars'>\n";
        $star_color = "gold";
        if ($rune->geT_level() == 15){
            $star_color = "purple";
        }
        for ($i = 0; $i < $rune->get_stars(); $i ++){
            $html .= "<img class='star star_$star_color' src='" . URL::IMG["ICON"] . "star.png'/>\n";
        }
        $html .= "</span>\n";
        $html .= "<span class='rune_level'>\n";
        $html .= $rune->get_level() . "\n";
        $html .= "</span>\n";
        $html .= "</div>\n";
        if ($unit instanceof Unit){
            $html .= "<div class='assigned'>\n";
            $html .= "<a target='blank' href='/monsters/" . $unit->get_id() . "'>\n";
            $html .= "<img title='" . $unit->get_title() . "' class='monster_image border_" . $unit->get_monster()->get_element_name() . "' src='" . $unit->get_monster()->get_image() . "'/>\n";
            $html .= "</a>\n";
            $html .= "</div>\n";
        }
        return $html;
    }

    /**
     * Generates a rune table.
     * 
     * @param Rune rune Entity to get the info from.
     * @param Unit unit Optional. The unit the rune is assigned to.
     * @return string HTML content for a rune table. Empty on error.
     */
    public static function rune_table($rune, $unit = null) {
        if (!($rune instanceof Rune)){
            return "";
        }
        $html = "";
        $html .= "<table class='rune' id='rune-" . $rune->get_id() . "'>\n";
        $html .= "<tr>\n";
        $html .= "<td class='icon'>\n";
        $html .= HTML::rune_panel($rune, $unit) . "\n";
        $html .= "</td>\n";
        $html .= "<td class='stats'>\n";
        $html .= "<table>\n";
        // Main stat
        $html .= "<tr class='main_stat'>\n";
        $html .= "<td class='stat'>\n";
        if (in_array($rune->get_main_stat()->get_stat_name(), array("CRR", "CRD", "RES", "ACC", "HP%", "ATK%", "DEF%"))){
            $stat_name = str_replace("%", "", $rune->get_main_stat()->get_stat_name());
            $stat_value = "+" . $rune->get_main_stat()->get_value() . "%";
        }
        else{
            $stat_name = $rune->get_main_stat()->get_stat_name();
            $stat_value = "+" . $rune->get_main_stat()->get_value(). "&nbsp;";
        }
        $html .= $stat_name . "\n";
        $html .= "</td>\n";
        $html .= "<td class='value'>\n";
        $html .= $stat_value . "\n";
        $html .= "</td>\n";
        $html .= "<td class='grind'>\n";
        $html .= "</td>\n";
        $html .= "<td class='enchant'>\n";
        $html .= "</td>\n";
        $html .= "</tr>\n";
        // Innate stat
        $html .= "<tr class='innate_stat'>\n";
        $html .= "<td class='stat'>\n";
        if ($rune->get_innate_stat() == null){
            $stat_name = "&nbsp;";
            $stat_value = "";
        }
        elseif (in_array($rune->get_innate_stat()->get_stat_name(), array("CRR", "CRD", "RES", "ACC", "HP%", "ATK%", "DEF%"))){
            $stat_name = str_replace("%", "", $rune->get_innate_stat()->get_stat_name());
            $stat_value = "+" . $rune->get_innate_stat()->get_value() . "%";
        }
        else{
            $stat_name = $rune->get_innate_stat()->get_stat_name();
            $stat_value = "+" . $rune->get_innate_stat()->get_value(). "&nbsp;";
        }
        $html .= $stat_name . "\n";
        $html .= "</td>\n";
        $html .= "<td class='value'>\n";
        $html .= $stat_value . "\n";
        $html .= "</td>\n";
        $html .= "<td class='grind'>\n";
        $html .= "</td>\n";
        $html .= "</tr>\n";
        for ($i = 0; $i < 4; $i ++){
            if ($rune->get_substats()[$i] == null){
                $stat_name = "&nbsp;";
                $stat_value = "";
            }
            elseif (in_array($rune->get_substats()[$i]->get_stat_name(), array("CRR", "CRD", "RES", "ACC", "HP%", "ATK%", "DEF%"))){
                $stat_name = str_replace("%", "", $rune->get_substats()[$i]->get_stat_name());
                $stat_value = "+" . $rune->get_substats()[$i]->get_value() . "%";
            }
            else{
                $stat_name = $rune->get_substats()[$i]->get_stat_name();
                $stat_value = "+" . $rune->get_substats()[$i]->get_value(). "&nbsp;";
            }
            $grind = "";
            if ($rune->get_substats()[$i] != null && $rune->get_substats()[$i]->get_grind() > 0){
                $grind = "+" . $rune->get_substats()[$i]->get_grind();
                if (in_array($rune->get_substats()[$i]->get_stat_name(), array("CRR", "CRD", "RES", "ACC", "HP%", "ATK%", "DEF%"))){
                    $grind = $grind . "%";
                }
            }
            $html .= "<tr class=substat>\n";
            $html .= "<td class='stat'>\n";
            $html .= $stat_name . "\n";
            $html .= "</td>\n";
            $html .= "<td class='value'>\n";
            $html .= $stat_value . "\n";
            $html .= "<td class='grind grind_$grind'>\n";
            $html .= $grind . "\n";
            if ($rune->get_substats()[$i] != null && $rune->get_substats()[$i]->is_enchanted()){
                $html .= "<img title='Enchanted' src='" . URL::IMG["RUNE"] . "enchanted.png'/>\n";
            }
            $html .= "</td>\n";
            $html .= "</tr>\n";
        }
        $html .= "</table>\n";
        $html .= "</td>\n";
        // Details
        $html .= "<td class='details'>\n";
        $html .= "<table class='table_details'>\n";
        $html .= "<tr>\n";
        $html .= "<td class='title'>\n";
        $html .= "QY.:\n";
        $html .= "</td>\n";
        $html .= "<td class='value'>\n";
        $html .= "<span class='quality quality_" . strtolower($rune->get_quality_name()) . "'>\n";
        $html .= $rune->get_quality_name() . "\n";
        $html .= "</span>\n";
        $html .= "</td>\n";
        $html .= "</tr>\n";
        $html .= "<tr>\n";
        $html .= "<td class='title'>\n";
        $html .= "O.QY.:\n";
        $html .= "</td>\n";
        $html .= "<td class='value'>\n";
        $html .= "<span class='quality quality_" . strtolower($rune->geT_original_quality_name()) . "'>\n";
        $html .= $rune->get_original_quality_name() . "\n";
        $html .= "</span>\n";
        $html .= "</td>\n";
        $html .= "</tr>\n";
        $html .= "<tr>\n";
        $html .= "<td class='title'>\n";
        $html .= "Value:\n";
        $html .= "</td>\n";
        $html .= "<td class='value'>\n";
        $html .= number_format($rune->get_value(), 0, ".", ",") . "\n";
        $html .= "</td>\n";
        $html .= "</tr>\n";
        $html .= "<tr>\n";
        $html .= "<td class='title'>\n";
        $html .= "EFF.:\n";
        $html .= "</td>\n";
        $html .= "<td class='value'>\n";
        $html .= number_format($rune->get_efficiency(), 2, ".", ",") . "%\n";
        $html .= "</td>\n";
        $html .= "</tr>\n";
        $html .= "<tr>\n";
        $html .= "<td class='title'>\n";
        $html .= "MX.E.:\n";
        $html .= "</td>\n";
        $html .= "<td class='value'>\n";
        $html .= number_format($rune->get_max_efficiency(), 2, ".", ",") . "%\n";
        $html .= "</td>\n";
        $html .= "</tr>\n";
        $html .= "</table>\n";
        $html .= "</td>\n";
        $html .= "</tr>\n";
        $html .= "</table>\n";
        return $html;
    }

    // TODO: Icon and background selection must go in the entity code.
    /**
     * Generates an artifact panel.
     * 
     * @param Artifact artifact Entity to get the info from.
     * @param Unit unit Optional. The unit the artifact is assigned to.
     * @return string HTML content for an artifact panel. Empty on error.
     */
    public static function artifact_panel($artifact, $unit = null) {
        if (!($artifact instanceof Artifact)){
            return "";
        }
        $html = "";
        $html .= "<div class='artifact_panel artifact_level_" . $artifact->get_level() . " artifact_quality_" . strtolower($artifact->get_quality_name()) . " artifact_original_quality_" . strtolower($artifact->get_original_quality_name()) . " '>\n";
        $background = "";
        $icon = "";
        if ($artifact->is_archetypal()){
            $background = URL::IMG["ARTIFACT"] . "type_" . strtolower($artifact->get_quality_name()) . ".png";
            $icon = URL::IMG["ARTIFACT"] . "type_";
            switch ($artifact->get_archetype()){
                case ARCHETYPE_ID::ATTACK:
                    $icon .= "attack";
                    break;
                case ARCHETYPE_ID::DEFENSE:
                    $icon .= "defense";
                    break;
                case ARCHETYPE_ID::HP:
                    $icon .= "hp";
                    break;
                case ARCHETYPE_ID::SUPPORT:
                    $icon .= "support";
                    break;
            }
            $icon .= ".png";
        }
        else{
            $background = URL::IMG["ARTIFACT"] . "element_" . strtolower($artifact->get_quality_name()) . ".png";
            $icon = URL::IMG["ARTIFACT"] . "element_";
            switch ($artifact->get_element()){
                case ELEMENT_ID::WATER:
                    $icon .= "water";
                    break;
                case ELEMENT_ID::WIND:
                    $icon .= "wind";
                    break;
                case ELEMENT_ID::FIRE:
                    $icon .= "fire";
                    break;
                case ELEMENT_ID::LIGHT:
                    $icon .= "light";
                    break;
                case ELEMENT_ID::DARK:
                    $icon .= "dark";
                    break;
            }
            $icon .= ".png";
        }
        $html .= "<img class='artifact_base' src='" . $background . "'/>\n";
        $html .= "<img class='artifact_icon' src='" . $icon . "'/>\n";
        $html .= "<span class='artifact_stars'>\n";
        $html .= "</span>\n";
        $html .= "<span class='artifact_level'>\n";
        $html .= $artifact->get_level() . "\n";
        $html .= "</span>\n";
        $html .= "</div>\n";
        if ($unit instanceof Unit){
            $html .= "<div class='assigned'>\n";
            $html .= "<a target='blank' href='/monsters/" . $unit->get_id() . "'>\n";
            $html .= "<img title='" . $unit->get_title() . "' class='monster_image border_" . $unit->get_monster()->get_element_name() . "' src='" . $unit->get_monster()->get_image() . "'/>\n";
            $html .= "</a>\n";
            $html .= "</div>\n";
        }
        return $html;
    }

    /**
     * Generates a artifact table.
     * 
     * @param Artifact artifact Entity to get the info from.
     * @param Unit unit Optional. The unit the artifact is assigned to.
     * @return string HTML content for a artifact table. Empty on error.
     */
    public static function artifact_table($artifact, $unit = null) {
        if (!($artifact instanceof Artifact)){
            return "";
        }
        $html = "";
        $html .= "<table class='artifact' id='artifact-" . $artifact->get_id() . "'>\n";
        $html .= "<tr>\n";
        $html .= "<td class='icon'>\n";
        $html .= HTML::artifact_panel($artifact, $unit) . "\n";
        $html .= "</td>\n";
        $html .= "<td class='effects'>\n";
        $html .= "<table>\n";
        // Main stat
        $html .= "<tr class='effect main_stat'>\n";
        $html .= "<td class='effect'>\n";
        $stat_name = $artifact->get_stat()->get_name();
        $stat_value = "+" . $artifact->get_stat()->get_value();
        $html .= $stat_name . "\n";
        $html .= $stat_value . "\n";
        $html .= "</td>\n";
        $html .= "</tr>\n";
        //$effects = array($artifact->effect_1_description, $artifact->effect_2_description, $artifact->effect_3_description, $artifact->effect_4_description);
        for ($i = 0; $i < 4; $i ++){
            $html .= "<tr class='effect'>\n";
            $html .= "<td class='effect'>\n";
            if (count($artifact->get_effects()) <= $i){
                $name = "&nbsp;";
            }
            else{
                $name = $artifact->get_effects()[$i]->get_name();
                $name = str_replace("Increasing", "Inc.", $name);
                $name = str_replace("Decrease", "Dec.", $name);
                $name = str_replace("Critical", "Crit.", $name);
                $name = str_replace("Received ", "", $name);
                $name = str_replace("Damage", "Dmg.", $name);
                $name = str_replace("Additional", "Addl.", $name);
                $name = str_replace("Proportional", "Rel.", $name);
                $name = str_replace("Counterattack", "Counter", $name);
                $name = str_replace("Dealt by Attacking Together", "Attacking Together", $name);
                $name = str_replace("HP condition is bad", "bad HP", $name);
                $name = str_replace("HP condition is good", "good HP", $name);
            }
            $html .= $name;
            $html .= "</td>\n";
            $html .= "</tr>\n";
        }
        $html .= "</table>\n";
        $html .= "</td>\n";
        $html .= "</tr>\n";
        $html .= "<tr>\n";
        $html .= "<td class='details' colspan='2'>\n";
        $html .= "EFF.: " . number_format($artifact->get_efficiency(), 2, ".", ",") . "%&nbsp;&nbsp;\n";
        $html .= "MX.E.: " . number_format($artifact->get_max_efficiency(), 2, ".", ",") . "%&nbsp;&nbsp;\n";
        $html .= "Value.: " . number_format($artifact->get_value(), 0, ".", ",") . "\n";
        $html .= "</td>\n";
        $html .= "</tr>\n";
        $html .= "</table>\n";
        return $html;
    }

    /**
     * Generates a grindstone or gem panel.
     * 
     * @param Enchantment Entity to get the info from.
     * @return string HTML content for a rune panel. Empty on error.
     */
    public static function enchantment_panel($enchantment) {
        if (!($enchantment instanceof Enchantment)){
            return "";
        }
        $html = "";
        if ($enchantment->is_gem()){
            if ($enchantment->is_inmemorial()){
                $base = URL::IMG["GRIND"] . "gem_inmemorial.png";
            }
            else{
                $base = URL::IMG["GRIND"] . "gem.png";
            }
        }
        else{
            if ($enchantment->is_inmemorial()){
                $base = URL::IMG["GRIND"] . "grind_inmemorial.png";
            }
            else{
                $base = URL::IMG["GRIND"] . "grind.png";
            }
        }
        if (! $enchantment->is_inmemorial() && $enchantment->get_rune_set() != null){
            $icon = "<img class='enchantment_icon' src='" . $enchantment->get_rune_set()->get_image() . "'/>\n";
        }
        else{
            $icon = "";
        }
        if (in_array($enchantment->get_stat_name(), array("CRR", "CRD", "RES", "ACC", "HP%", "ATK%", "DEF%"))){
            $stat_name = str_replace("%", "", $enchantment->get_stat_name());
            $stat_value = "+" . $enchantment->get_min() . "~" . $enchantment->get_max() . "%";
        }
        else{
            $stat_name = $enchantment->get_stat_name();
            $stat_value = "+" . $enchantment->get_min() . "~" . $enchantment->get_max();
        }
        $html .= "<div class='enchantment_panel enchantment_quality_" . strtolower($enchantment->get_quality_name()) . " enchantment_ancient_" . $enchantment->is_ancient() . "'>\n";
        $html .= "<img class='enchantment_base' src='" . $base . "'/>\n";
        $html .= $icon;
        $html .= "<span class='enchantment_stat'>\n";
        $html .= "<span class='enchantment_stat->stat_name'>" . $stat_name . "</span>\n";
        $html .= "<span class='enchantment_stat->value'>" . $stat_value . "</span>\n";
        $html .= "</span>\n";
        if ($enchantment->get_amount() > 1){
            $html .= "<span class='enchantment_amount'>\n";
            $html .= "x" . $enchantment->get_amount() . "\n";
            $html .= "</span>\n";
        }
        $html .= "</div>\n";
        return $html;
    }

    /**
     * Generates a building panel.
     *
     * @param Building|Decoration|Buildable|Decorative $building Entity to get the info from.
     * @return string HTML content for a building panel. Empty on error.
     */
    public static function building_panel($building) {
        if ($building instanceof Building){
            $level = false;
            $title = $building->get_buildable()->get_name();
            $description = $building->get_buildable()->get_description();
            $img = $building->get_buildable()->get_image();
        }
        elseif ($building instanceof Buildable){
            $level = false;
            $title = $building->get_name();
            $description = $building->get_description();
            $img = $building->get_image();
        }
        elseif ($building instanceof Decoration){
            $level = $building->get_level();
            $title = $building->get_decorative()->get_name();
            $description = $building->get_decorative()->get_description();
            $img = $building->get_decorative()->get_image();
        }
        elseif ($building instanceof Decorative){
            $level = false;
            $title = $building->get_name();
            $description = $building->get_description();
            $img = $building->get_image();
        }
        else{
            return "";
        }
        if (strlen($description) > 0){
            $title .= ": " . $description;
        }
        $html = "<div class='building_panel'>\n";
        $html .= "<img title='" . $title . "' class='building' src='" . $img . "'/>\n";
        if ($level){
            $html .= "<span class='level'>\n";
            $html .= $level . "\n";
            $html .= "</span>\n";
        }
        $html .= "</div>\n";
        return $html;
    }

    /**
     * Generates a item panel.
     *
     * @param Inventory $item Entity to get the info from.
     * @return string HTML content for an item panel. Empty on error.
     */
    public static function item_panel($item) {
        if (!($item instanceof Inventory) && !($item instanceof Item)){
            return "";
        }

        if ($item instanceof Item){
            $html = "<div class='item_panel'>\n";
            $html .= "<img title='" . $item->get_name() . "' class='item' src='" . $item->get_image() . "'/>\n";
            $html .= "<span class='amount'>\n";
            $html .= $item->get_amount() . "\n";
            $html .= "</span>\n";
            $html .= "</div>\n";
        }
        elseif ($item instanceof Inventory){
            $html = "<div class='item_panel'>\n";
            $html .= "<img title='" . $item->get_name() . "' class='item' src='" . $item->get_image() . "'/>\n";
            $html .= "</div>\n";
        }
        return $html;
    }

    /**
     * Generates a source panel.
     *
     * @param Inventory $source Entity to get the info from.
     * @return string HTML content for a source panel. Empty on error.
     */
    public static function source_panel($source) {
        //if (!($item instanceof Source)){
        //    return "";
        //}
        $html = "<div class='source_panel'>\n";
        $html .= "<img title='" . $source->get_name() . "' class='item' src='" . $source->get_image() . "'/>\n";
        $html .= "</div>\n";
        return $html;
    }

    /**
     * Generates an arena rank icon image.
     *
     * @param int $d Arena rank id.
     * @return string HTML content for the image.
     */
    public static function arena_rank_icon($id) {
        switch ($id){
            case ARENA_RANK_ID::BEGINER:
                $src = URL::IMG["RANK"] . "0901.png";
                $tit = "Beginer";
                break;
            case ARENA_RANK_ID::CHALLENGER_1:
                $src = URL::IMG["RANK"] . "1001.png";
                $tit = "Challenger 1";
                break;
            case ARENA_RANK_ID::CHALLENGER_2:
                $src = URL::IMG["RANK"] . "1002.png";
                $tit = "Challenger 2";
                break;
            case ARENA_RANK_ID::CHALLENGER_3:
                $src = URL::IMG["RANK"] . "1003.png";
                $tit = "Challenger 3";
                break;
            case ARENA_RANK_ID::FIGHTER_1:
                $src = URL::IMG["RANK"] . "2001.png";
                $tit = "Fighter 1";
                break;
            case ARENA_RANK_ID::FIGHTER_2:
                $src = URL::IMG["RANK"] . "2002.png";
                $tit = "Fighter 2";
                break;
            case ARENA_RANK_ID::FIGHTER_3:
                $src = URL::IMG["RANK"] . "2003.png";
                $tit = "Fighter 3";
                break;
            case ARENA_RANK_ID::CONQUEROR_1:
                $src = URL::IMG["RANK"] . "3001.png";
                $tit = "Conqueror 1";
                break;
            case ARENA_RANK_ID::CONQUEROR_2:
                $src = URL::IMG["RANK"] . "3002.png";
                $tit = "Conqueror 2";
                break;
            case ARENA_RANK_ID::CONQUEROR_3:
                $src = URL::IMG["RANK"] . "3003.png";
                $tit = "Conqueror 3";
                break;
            case ARENA_RANK_ID::GUARDIAN_1:
                $src = URL::IMG["RANK"] . "4001.png";
                $tit = "Guardian 1";
                break;
            case ARENA_RANK_ID::GUARDIAN_2:
                $src = URL::IMG["RANK"] . "4002.png";
                $tit = "Guardian 2";
                break;
            case ARENA_RANK_ID::GUARDIAN_3:
                $src = URL::IMG["RANK"] . "4003.png";
                $tit = "Guardian 3";
                break;
            case ARENA_RANK_ID::LEGEND:
                $src = URL::IMG["RANK"] . "5001.png";
                $tit = "Legend";
            default:
                $src = URL::IMG["RANK"] . "0901.png";
                $tit = "Beginer";
        }
        $html = "<img alt='$tit' title='$tit' src='$src'/>";
        return $html;
    }

}