<?php
namespace App\Cache;

class Cache {

    /**
     * Get Username from API or cache
     *
     * @param $uuid
     * @return bool|mixed The username if success or the UUID if failed
     */
    public static function getUsername($uuid) {
        if (file_exists(storage_path('app/uuid/'.$uuid.'.json'))) {
            $json = file_get_contents(storage_path('app/uuid/'.$uuid.'.json'));
            $json = json_decode($json, true);
            if ((time() - strtotime($json['time'])) > 3600) {
                $username = self::getUsernameUncached($uuid);
                if ($username == false) {
                    return $json['name'];
                } else {
                    $json = [];
                    $json['id'] = $uuid;
                    $json['name'] = $username;
                    self::saveJson($json);
                    return $json['name'];
                }
            } else {
                return $json['name'];
            }
        } else {
            $username = self::getUsernameUncached($uuid);
            if ($username === $uuid) {
                return $uuid;
            } else {
                $json = [];
                $json['id'] = $uuid;
                $json['name'] = $username;
                self::saveJson($json);
                return $json['name'];
            }
        }
    }

    /**
     * Get UUID from API or cache
     *
     * @param $username
     * @return bool|mixed The UUID if success or the username if failed
     */
    public static function getUUID($username) {
        foreach(glob(storage_path('app/uuid/*')) as $file) {
            $json = file_get_contents($file);
            $json = json_decode($json, true);

            if ($json['name'] !== $username) continue;

            if ((time() - strtotime($json['time'])) > 3600) {
                $uuid = self::getUUIDUncached($username);
                if ($uuid == false) {
                    unlink(storage_path('app/uuid/'.$file));
                    return $json['name'];
                } else {
                    $json = [];
                    $json['id'] = $uuid;
                    $json['name'] = $username;
                    self::saveJson($json);
                    return $json['id'];
                }
            } else {
                return $json['id'];
            }
        }

        $uuid = self::getUUIDUncached($username);
        if ($uuid == false) {
            return $username;
        } else {
            $json = [];
            $json['id'] = $uuid;
            $json['name'] = $username;
            self::saveJson($json);
            return $json['id'];
        }
    }

    /**
     * Get the UUID by the username
     *
     * @param $username
     * @return bool|mixed The UUID without dashes, or false if failed
     */
    private static function getUUIDUncached($username) {
        $profile = self::getProfile($username);
        if (is_array($profile) and isset($profile['id']))
            return $profile['id'];

        return false;
    }

    /**
     * Get the profile (username & UUID) from the username
     *
     * @uses http://wiki.vg/Mojang_API#Username_-.3E_UUID_at_time
     *
     * @param $username
     * @return bool|mixed Array with ID and name, or false if failed
     */
    private static function getProfile($username) {
        if (self::isValidUsername($username)) {
            $json = file_get_contents('https://api.mojang.com/users/profiles/minecraft/' . $username);
            if (!empty($json)) {
                $data = json_decode($json, true);
                if (is_array($data) and !empty($data)) {
                    return $data;
                }
            }
        }
        return false;
    }

    /**
     * Get the username from the UUID
     *
     * @uses http://wiki.vg/Mojang_API#UUID_-.3E_Name_history
     *
     * @param $uuid
     * @return bool|mixed Username, or false if failed
     */
    private static function getUsernameUncached($uuid) {
        if (is_string($uuid)) {
            $json = file_get_contents('https://api.mojang.com/user/profiles/' . $uuid . '/names');
            if (!empty($json)) {
                $data = json_decode($json, true);
                if (!empty($data) and is_array($data)) {
                    $last = array_pop($data);
                    if (is_array($last) and isset($last['name'])) {
                        return $last['name'];
                    }
                }
            }
        }
        return false;
    }

    /**
     * Check if the username is correct.
     *
     * @param $username
     * @return bool Valid or not
     */
    private static function isValidUsername($username) {
        return is_string($username) and strlen($username) >= 2 and strlen($username) <= 16 and ctype_alnum(str_replace('_', '', $username));
    }

    /**
     * Save the JSON to a file
     *
     * @param $json
     */
    private static function saveJson($json) {
        $array = [
            'id' => $json['id'],
            'name' => $json['name'],
            'time' => date('d-m-Y H:m:s')
        ];

        file_put_contents(storage_path('app/uuid/'.$json['id'].'.json'), json_encode($array));
    }

}