<?php

namespace Workerman\Protocols\Http;

use function array_merge_recursive;
use function explode;
use function file;
use function filemtime;
use function gmdate;
use function is_array;
use function is_file;
use function pathinfo;
use function preg_match;
use function rawurlencode;
use function strlen;
use function substr;

use const FILE_IGNORE_NEW_LINES;
use const FILE_SKIP_EMPTY_LINES;

/**
 * Class Response
 * @package Workerman\Protocols\Http
 */
class Response
{
    /**
     * Phrases.
     *
     * @var array<int,string>
     *
     * @link https://en.wikipedia.org/wiki/List_of_HTTP_status_codes
     */
    const PHRASES = [
        100 => 'Continue',
        101 => 'Switching Protocols',
        102 => 'Processing', // WebDAV; RFC 2518
        103 => 'Early Hints', // RFC 8297

        200 => 'OK',
        201 => 'Created',
        202 => 'Accepted',
        203 => 'Non-Authoritative Information', // since HTTP/1.1
        204 => 'No Content',
        205 => 'Reset Content',
        206 => 'Partial Content', // RFC 7233
        207 => 'Multi-Status', // WebDAV; RFC 4918
        208 => 'Already Reported', // WebDAV; RFC 5842
        226 => 'IM Used', // RFC 3229

        300 => 'Multiple Choices',
        301 => 'Moved Permanently',
        302 => 'Found', // Previously "Moved temporarily"
        303 => 'See Other', // since HTTP/1.1
        304 => 'Not Modified', // RFC 7232
        305 => 'Use Proxy', // since HTTP/1.1
        306 => 'Switch Proxy',
        307 => 'Temporary Redirect', // since HTTP/1.1
        308 => 'Permanent Redirect', // RFC 7538

        400 => 'Bad Request',
        401 => 'Unauthorized', // RFC 7235
        402 => 'Payment Required',
        403 => 'Forbidden',
        404 => 'Not Found',
        405 => 'Method Not Allowed',
        406 => 'Not Acceptable',
        407 => 'Proxy Authentication Required', // RFC 7235
        408 => 'Request Timeout',
        409 => 'Conflict',
        410 => 'Gone',
        411 => 'Length Required',
        412 => 'Precondition Failed', // RFC 7232
        413 => 'Payload Too Large', // RFC 7231
        414 => 'URI Too Long', // RFC 7231
        415 => 'Unsupported Media Type', // RFC 7231
        416 => 'Range Not Satisfiable', // RFC 7233
        417 => 'Expectation Failed',
        418 => 'I\'m a teapot', // RFC 2324, RFC 7168
        421 => 'Misdirected Request', // RFC 7540
        422 => 'Unprocessable Entity', // WebDAV; RFC 4918
        423 => 'Locked', // WebDAV; RFC 4918
        424 => 'Failed Dependency', // WebDAV; RFC 4918
        425 => 'Too Early', // RFC 8470
        426 => 'Upgrade Required',
        428 => 'Precondition Required', // RFC 6585
        429 => 'Too Many Requests', // RFC 6585
        431 => 'Request Header Fields Too Large', // RFC 6585
        451 => 'Unavailable For Legal Reasons', // RFC 7725

        500 => 'Internal Server Error',
        501 => 'Not Implemented',
        502 => 'Bad Gateway',
        503 => 'Service Unavailable',
        504 => 'Gateway Timeout',
        505 => 'HTTP Version Not Supported',
        506 => 'Variant Also Negotiates', // RFC 2295
        507 => 'Insufficient Storage', // WebDAV; RFC 4918
        508 => 'Loop Detected', // WebDAV; RFC 5842
        510 => 'Not Extended', // RFC 2774
        511 => 'Network Authentication Required', // RFC 6585
    ];

    /**
     * Header data.
     *
     * @var array
     */
    protected array $headers = [];

    /**
     * Http status.
     *
     * @var int
     */
    protected int $status;

    /**
     * Http reason.
     *
     * @var ?string
     */
    protected ?string $reason = null;

    /**
     * Http version.
     *
     * @var string
     */
    protected string $version = '1.1';

    /**
     * Http body.
     *
     * @var string
     */
    protected string $body = '';

    /**
     * Send file info
     *
     * @var ?array
     */
    public ?array $file = null;

    /**
     * Mine type map.
     * @var array
     */
    protected static array $mimeTypeMap = [];

    /**
     * Init.
     *
     * @return void
     */
    public static function init(): void
    {
        static::initMimeTypeMap();
    }

    /**
     * Response constructor.
     *
     * @param int $status
     * @param array|null $headers
     * @param string $body
     */
    public function __construct(int $status = 200, ?array $headers = [], string $body = '')
    {
        $this->status = $status;
        $this->headers = $headers;
        $this->body = $body;
    }

    /**
     * Set header.
     *
     * @param string $name
     * @param string $value
     * @return $this
     */
    public function header(string $name, string $value): static
    {
        $this->headers[$name] = $value;
        return $this;
    }

    /**
     * Set header.
     *
     * @param string $name
     * @param string $value
     * @return $this
     */
    public function withHeader(string $name, string $value): static
    {
        return $this->header($name, $value);
    }

    /**
     * Set headers.
     *
     * @param array $headers
     * @return $this
     */
    public function withHeaders(array $headers): static
    {
        $this->headers = array_merge_recursive($this->headers, $headers);
        return $this;
    }

    /**
     * Remove header.
     *
     * @param string $name
     * @return $this
     */
    public function withoutHeader(string $name): static
    {
        unset($this->headers[$name]);
        return $this;
    }

    /**
     * Get header.
     *
     * @param string $name
     * @return null|array|string
     */
    public function getHeader(string $name): array|string|null
    {
        return $this->headers[$name] ?? null;
    }

    /**
     * Get headers.
     *
     * @return array
     */
    public function getHeaders(): array
    {
        return $this->headers;
    }

    /**
     * Set status.
     *
     * @param int $code
     * @param string|null $reasonPhrase
     * @return $this
     */
    public function withStatus(int $code, string $reasonPhrase = null): static
    {
        $this->status = $code;
        $this->reason = $reasonPhrase;
        return $this;
    }

    /**
     * Get status code.
     *
     * @return int
     */
    public function getStatusCode(): int
    {
        return $this->status;
    }

    /**
     * Get reason phrase.
     *
     * @return ?string
     */
    public function getReasonPhrase(): ?string
    {
        return $this->reason;
    }

    /**
     * Set protocol version.
     *
     * @param string $version
     * @return $this
     */
    public function withProtocolVersion(string $version): static
    {
        $this->version = $version;
        return $this;
    }

    /**
     * Set http body.
     *
     * @param string $body
     * @return $this
     */
    public function withBody(string $body): static
    {
        $this->body = $body;
        return $this;
    }

    /**
     * Get http raw body.
     *
     * @return string
     */
    public function rawBody(): string
    {
        return $this->body;
    }

    /**
     * Send file.
     *
     * @param string $file
     * @param int $offset
     * @param int $length
     * @return $this
     */
    public function withFile(string $file, int $offset = 0, int $length = 0): static
    {
        if (!is_file($file)) {
            return $this->withStatus(404)->withBody('<h3>404 Not Found</h3>');
        }
        $this->file = ['file' => $file, 'offset' => $offset, 'length' => $length];
        return $this;
    }

    /**
     * Set cookie.
     *
     * @param string $name
     * @param string $value
     * @param int|null $maxAge
     * @param string $path
     * @param string $domain
     * @param bool $secure
     * @param bool $httpOnly
     * @param bool $sameSite
     * @return $this
     */
    public function cookie(
        string $name,
        string $value = '',
        int $maxAge = null,
        string $path = '',
        string $domain = '',
        bool $secure = false,
        bool $httpOnly = false,
        bool $sameSite = false,
    ): static {
        $this->headers['Set-Cookie'][] = $name . '=' . rawurlencode($value)
            . (empty($domain) ? '' : '; Domain=' . $domain)
            . ($maxAge === null ? '' : '; Max-Age=' . $maxAge)
            . (empty($path) ? '' : '; Path=' . $path)
            . (!$secure ? '' : '; Secure')
            . (!$httpOnly ? '' : '; HttpOnly')
            . (empty($sameSite) ? '' : '; SameSite=' . $sameSite);
        return $this;
    }

    /**
     * Create header for file.
     *
     * @param array $fileInfo
     * @return string
     */
    protected function createHeadForFile(array $fileInfo): string
    {
        $file = $fileInfo['file'];
        $reason = $this->reason ?: self::PHRASES[$this->status];
        $head = "HTTP/$this->version $this->status $reason\r\n";
        $headers = $this->headers;
        if (!isset($headers['Server'])) {
            $head .= "Server: workerman\r\n";
        }
        foreach ($headers as $name => $value) {
            if (is_array($value)) {
                foreach ($value as $item) {
                    $head .= "$name: $item\r\n";
                }
                continue;
            }
            $head .= "$name: $value\r\n";
        }

        if (!isset($headers['Connection'])) {
            $head .= "Connection: keep-alive\r\n";
        }

        $fileInfo = pathinfo($file);
        $extension = $fileInfo['extension'] ?? '';
        $baseName = $fileInfo['basename'] ?? 'unknown';
        if (!isset($headers['Content-Type'])) {
            if (isset(self::$mimeTypeMap[$extension])) {
                $head .= "Content-Type: " . self::$mimeTypeMap[$extension] . "\r\n";
            } else {
                $head .= "Content-Type: application/octet-stream\r\n";
            }
        }

        if (!isset($headers['Content-Disposition']) && !isset(self::$mimeTypeMap[$extension])) {
            $head .= "Content-Disposition: attachment; filename=\"$baseName\"\r\n";
        }

        if (!isset($headers['Last-Modified'])) {
            if ($mtime = filemtime($file)) {
                $head .= 'Last-Modified: ' . gmdate('D, d M Y H:i:s', $mtime) . ' GMT' . "\r\n";
            }
        }

        return "$head\r\n";
    }

    /**
     * __toString.
     *
     * @return string
     */
    public function __toString()
    {
        if ($this->file) {
            return $this->createHeadForFile($this->file);
        }

        $reason = $this->reason ?: self::PHRASES[$this->status] ?? '';
        $bodyLen = strlen($this->body);
        if (empty($this->headers)) {
            return "HTTP/$this->version $this->status $reason\r\nServer: workerman\r\nContent-Type: text/html;charset=utf-8\r\nContent-Length: $bodyLen\r\nConnection: keep-alive\r\n\r\n$this->body";
        }

        $head = "HTTP/$this->version $this->status $reason\r\n";
        $headers = $this->headers;
        if (!isset($headers['Server'])) {
            $head .= "Server: workerman\r\n";
        }
        foreach ($headers as $name => $value) {
            if (is_array($value)) {
                foreach ($value as $item) {
                    $head .= "$name: $item\r\n";
                }
                continue;
            }
            $head .= "$name: $value\r\n";
        }

        if (!isset($headers['Connection'])) {
            $head .= "Connection: keep-alive\r\n";
        }

        if (!isset($headers['Content-Type'])) {
            $head .= "Content-Type: text/html;charset=utf-8\r\n";
        } else if ($headers['Content-Type'] === 'text/event-stream') {
            return $head . $this->body;
        }

        if (!isset($headers['Transfer-Encoding'])) {
            $head .= "Content-Length: $bodyLen\r\n\r\n";
        } else {
            return $bodyLen ? "$head\r\n" . dechex($bodyLen) . "\r\n{$this->body}\r\n" : "$head\r\n";
        }

        // The whole http package
        return $head . $this->body;
    }

    /**
     * Init mime map.
     *
     * @return void
     */
    public static function initMimeTypeMap(): void
    {
        $mimeFile = __DIR__ . '/mime.types';
        $items = file($mimeFile, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
        foreach ($items as $content) {
            if (preg_match("/\s*(\S+)\s+(\S.+)/", $content, $match)) {
                $mimeType = $match[1];
                $extensionVar = $match[2];
                $extensionArray = explode(' ', substr($extensionVar, 0, -1));
                foreach ($extensionArray as $fileExtension) {
                    static::$mimeTypeMap[$fileExtension] = $mimeType;
                }
            }
        }
    }
}
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