1:   2:   3:   4:   5:   6:   7:   8:   9:  10:  11:  12:  13:  14:  15:  16:  17:  18:  19:  20:  21:  22:  23:  24:  25:  26:  27:  28:  29:  30:  31:  32:  33:  34:  35:  36:  37:  38:  39:  40:  41:  42:  43:  44:  45:  46:  47:  48:  49:  50:  51:  52:  53:  54:  55:  56:  57:  58:  59:  60:  61:  62:  63:  64:  65:  66:  67:  68:  69:  70:  71:  72:  73:  74:  75:  76:  77:  78:  79:  80:  81:  82:  83:  84:  85:  86:  87:  88:  89:  90:  91:  92:  93:  94:  95:  96:  97:  98:  99: 100: 101: 102: 103: 104: 105: 106: 107: 108: 109: 110: 111: 112: 113: 114: 115: 116: 117: 118: 119: 120: 121: 122: 123: 124: 125: 126: 127: 128: 129: 130: 131: 132: 133: 134: 135: 136: 137: 138: 139: 140: 141: 142: 143: 144: 145: 

<?php

/**
 * MvcCore
 *
 * This source file is subject to the BSD 3 License
 * For the full copyright and license information, please view
 * the LICENSE.md file that are distributed with this source code.
 *
 * @copyright   Copyright (c) 2016 Tom Flidr (https://github.com/mvccore)
 * @license  https://mvccore.github.io/docs/mvccore/5.0.0/LICENCE.md
 */

namespace MvcCore\Response;

trait Headers {

    /**
     * @inheritDocs
     * @return bool
     */
    public function IsSentHeaders () {
        /** @var $this \MvcCore\Response */
        return headers_sent();
    }

    /**
     * @inheritDocs
     * @param array $headers
     * @param bool $cleanAllPrevious `FALSE` by default. If `TRUE`, all previous headers
     *                               set by PHP `header()` or by this object will be removed.
     * @return \MvcCore\Response
     */
    public function SetHeaders (array $headers = [], $cleanAllPrevious = FALSE) {
        /** @var $this \MvcCore\Response */
        if ($cleanAllPrevious) {
            header_remove();
            $this->headers = [];
        }
        foreach ($headers as $name => $value) {
            $this->SetHeader($name, $value);
        }
        return $this;
    }

    /**
     * @inheritDocs
     * @param string $name
     * @param string $value
     * @return \MvcCore\Response
     */
    public function SetHeader ($name, $value) {
        /** @var $this \MvcCore\Response */
        if (isset($this->disabledHeaders[$name]))
            return $this;
        header($name . ": " . $value);
        $this->headers[$name] = $value;
        $nameLower = mb_strtolower($name);
        if ($nameLower === 'content-type') {
            $charsetPos = strpos($value, 'charset');
            if ($charsetPos !== FALSE) {
                $equalPos = strpos($value, '=', $charsetPos);
                if ($equalPos !== FALSE) $this->SetEncoding(
                    trim(substr($value, $equalPos + 1))
                );
            }
        }
        if ($nameLower === 'content-encoding') 
            $this->SetEncoding($value);
        return $this;
    }

    /**
     * @inheritDocs
     * @param string $name
     * @return string|NULL
     */
    public function GetHeader ($name) {
        /** @var $this \MvcCore\Response */
        $this->UpdateHeaders();
        return isset($this->headers[$name])
            ? $this->headers[$name]
            : NULL;
    }

    /**
     * @inheritDocs
     * @param string $name
     * @return bool
     */
    public function HasHeader ($name) {
        /** @var $this \MvcCore\Response */
        $this->UpdateHeaders();
        return isset($this->headers[$name]);
    }

    /**
     * @inheritDocs
     * @return \MvcCore\Response
     */
    public function UpdateHeaders () {
        /** @var $this \MvcCore\Response */
        $rawHeaders = headers_list();
        $name = '';
        $value = '';
        foreach ($rawHeaders as $rawHeader) {
            $doubleDotPos = strpos($rawHeader, ':');
            if ($doubleDotPos !== FALSE) {
                $name = trim(substr($rawHeader, 0, $doubleDotPos));
                $value = trim(substr($rawHeader, $doubleDotPos + 1));
            } else {
                $name = $rawHeader;
                $value = '';
            }
            if (!isset($this->disabledHeaders[$name]))
                $this->headers[$name] = $value;
        }
        return $this;
    }

    /**
     * @inheritDocs
     * @param \string[] $disabledHeaders,...
     * @return \MvcCore\Response
     */
    public function SetDisabledHeaders ($disabledHeaders) {
        /** @var $this \MvcCore\Response */
        $this->disabledHeaders = [];
        $args = func_get_args();
        if (count($args) === 1 && is_array($args[0])) $args = $args[0];
        foreach ($args as $arg)
            $this->disabledHeaders[$arg] = TRUE;
        return $this;
    }

    /**
     * @inheritDocs
     * @return \string[]
     */
    public function GetDisabledHeaders () {
        /** @var $this \MvcCore\Response */
        return array_keys($this->disabledHeaders);
    }
}