<?php
class SeriaUserNotFoundException extends RuntimeException {}
class SeriaUserExtremelyNotFoundException extends SeriaUserNotFoundException {}

class SeriaUserColour {
    public const INHERIT = 0x40000000;

    private int $raw;

    public function __construct(int $raw) {
        $this->raw = $raw;
    }

    public function __toString(): string {
        if($this->raw & self::INHERIT)
            return 'inherit';
        return '#' . str_pad(dechex($this->raw & 0xFFFFFF), 6, '0', STR_PAD_LEFT);
    }
}

class SeriaUser {
    private const KEY_CHARS = 'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz0123456789';
    private const KEY_LENGTH = 48;

    private ?PDO $pdo;

    private string $user_id = '';
    private string $user_name = 'Anonymous';
    private int $user_colour = SeriaUserColour::INHERIT;
    private int $user_rank = 0;
    private int $user_permissions = 0;
    private ?string $user_pass_key = null;
    private int $user_bytes_downloaded = 0;
    private int $user_bytes_uploaded = 0;

    public function __construct(?PDO $pdo = null) {
        $this->pdo = $pdo;
    }

    public function getId(): string {
        return $this->user_id;
    }

    public function getName(): string {
        return $this->user_name;
    }

    public function getColour(): SeriaUserColour {
        return new SeriaUserColour($this->user_colour);
    }

    public function getColourRaw(): int {
        return $this->user_colour;
    }

    public function getRank(): int {
        return $this->user_rank;
    }

    public function getPermissionsRaw(): int {
        return $this->user_permissions;
    }

    public function getPassKey(): string {
        if(!$this->isLoggedIn())
            return '';

        if(($passKey = $this->user_pass_key) === null)
            return $this->resetPassKey();

        return $passKey;
    }

    public function getBytesDownloaded(): int {
        return $this->user_bytes_downloaded;
    }

    public function getBytesUploaded(): int {
        return $this->user_bytes_uploaded;
    }

    public function isLoggedIn() {
        return !empty($this->user_id);
    }

    public function isFlash(): bool {
        return $this->user_id === '1';
    }

    public function canCreateTorrents(): bool {
        return $this->isFlash()
            || $this->user_id === '32'
            || $this->user_id === '145';
    }

    public function canApproveTorrents(): bool {
        return $this->isFlash();
    }

    public function canRecalculateInfoHash(): bool {
        return $this->isFlash();
    }

    public function calculateRatio(): float {
        $bd = $this->getBytesDownloaded();
        if($bd === 0)
            return 0;
        return $this->getBytesUploaded() / $bd;
    }

    public function getActiveTransferCounts(): stdClass {
        return SeriaTorrentPeer::countUserStats($this->pdo, $this);
    }

    public function getProfileSubmissions(): array {
        return $this->getSubmissions(-1, 3);
    }

    public function getSubmissions(int $startAt, int $take): array {
        return SeriaTorrent::byUser($this->pdo, $this, $startAt, $take);
    }

    public static function generatePassKey(int $length): string {
        $keyChars = strlen(self::KEY_CHARS) - 1;
        $bytes = str_repeat("\0", $length);
        for($i = 0; $i < $length; ++$i)
            $bytes[$i] = self::KEY_CHARS[random_int(0, $keyChars)];
        return $bytes;
    }

    public function resetPassKey(): string {
        if(!$this->isLoggedIn())
            return '';

        $updatePassKey = $this->pdo->prepare('UPDATE `ser_users` SET `user_pass_key` = :pass WHERE `user_id` = :user');
        $updatePassKey->bindValue('user', $this->user_id);

        do {
            $updatePassKey->bindValue('pass', $passKey = self::generatePassKey(self::KEY_LENGTH));
        } while(!$updatePassKey->execute());

        return $this->user_pass_key = $passKey;
    }

    public function incrementTransferCounts(int $bytesDownloaded, int $bytesUploaded): void {
        if(!$this->isLoggedIn())
            return;

        $updateStats = $this->pdo->prepare('UPDATE `ser_users` SET `user_bytes_downloaded` = `user_bytes_downloaded` + :downloaded, `user_bytes_uploaded` = `user_bytes_uploaded` +  :uploaded WHERE `user_id` = :user');
        $updateStats->bindValue('downloaded', $bytesDownloaded);
        $updateStats->bindValue('uploaded', $bytesUploaded);
        $updateStats->bindValue('user', $this->user_id);

        if($updateStats->execute()) {
            $this->user_bytes_downloaded += $bytesDownloaded;
            $this->user_bytes_uploaded += $bytesUploaded;
        }
    }

    public static function anonymous(): self {
        return new static;
    }

    public static function fromMisuzu(PDO $pdo, stdClass $info): self {
        $update = $pdo->prepare('INSERT INTO `ser_users` (`user_id`, `user_name`, `user_colour`, `user_rank`, `user_permissions`) VALUES (:id, :name_1, :colour_1, :rank_1, :perms_1) ON DUPLICATE KEY UPDATE `user_name` = :name_2, `user_colour` = :colour_2, `user_rank` = :rank_2, `user_permissions` = :perms_2');
        $update->bindValue('id', $info->user_id);
        $update->bindValue('name_1', $info->username);
        $update->bindValue('name_2', $info->username);
        $update->bindValue('colour_1', $info->colour_raw);
        $update->bindValue('colour_2', $info->colour_raw);
        $update->bindValue('rank_1', $info->hierarchy);
        $update->bindValue('rank_2', $info->hierarchy);
        $update->bindValue('perms_1', $info->perms);
        $update->bindValue('perms_2', $info->perms);
        $update->execute();
        return self::byId($pdo, $info->user_id);
    }

    public static function byId(PDO $pdo, string $userId): self {
        $getUser = $pdo->prepare('SELECT `user_id`, `user_name`, `user_colour`, `user_rank`, `user_permissions`, `user_pass_key`, `user_bytes_downloaded`, `user_bytes_uploaded` FROM `ser_users` WHERE `user_id` = :user');
        $getUser->bindValue('user', $userId);

        if(!$getUser->execute())
            throw new SeriaUserExtremelyNotFoundException;

        if(($obj = $getUser->fetchObject(self::class, [$pdo])) === false)
            throw new SeriaUserNotFoundException;

        return $obj;
    }

    public static function byName(PDO $pdo, string $userName): self {
        $getUser = $pdo->prepare('SELECT `user_id`, `user_name`, `user_colour`, `user_rank`, `user_permissions`, `user_pass_key`, `user_bytes_downloaded`, `user_bytes_uploaded` FROM `ser_users` WHERE `user_name` = :user');
        $getUser->bindValue('user', $userName);

        if(!$getUser->execute())
            throw new SeriaUserExtremelyNotFoundException;

        if(($obj = $getUser->fetchObject(self::class, [$pdo])) === false)
            throw new SeriaUserNotFoundException;

        return $obj;
    }

    public static function byPassKey(PDO $pdo, string $passKey): self {
        $getUser = $pdo->prepare('SELECT `user_id`, `user_name`, `user_colour`, `user_rank`, `user_permissions`, `user_pass_key`, `user_bytes_downloaded`, `user_bytes_uploaded` FROM `ser_users` WHERE `user_pass_key` = :pass');
        $getUser->bindValue('pass', $passKey);

        if(!$getUser->execute())
            throw new SeriaUserExtremelyNotFoundException;

        if(($obj = $getUser->fetchObject(self::class, [$pdo])) === false)
            throw new SeriaUserNotFoundException;

        return $obj;
    }
}