<?php
/**
 * Shared utility functions for mcifa.com PHP conversion
 */

require_once __DIR__ . '/mail_config.php';

/**
 * HTML-escape shorthand for XSS protection
 */
function h($string) {
    return htmlspecialchars((string)$string, ENT_QUOTES, 'UTF-8');
}

/**
 * Check if the current user is logged in
 */
function isLoggedIn() {
    return !empty($_SESSION['Member']) && $_SESSION['Member'] !== '-1' && $_SESSION['Member'] !== -1;
}

/**
 * Require login - include error page and exit if not authenticated.
 * Checks session first, then falls back to cookie.
 */
function requireLogin() {
    // First check session
    if (!empty($_SESSION['Member']) && $_SESSION['Member'] !== '' && $_SESSION['Member'] !== '-1' && $_SESSION['Member'] !== -1) {
        return true;
    }

    // Fallback: check cookie
    if (!empty($_COOKIE['Member']) && $_COOKIE['Member'] !== '') {
        $_SESSION['Member'] = $_COOKIE['Member'];
        return true;
    }

    // Not authorized
    require __DIR__ . '/myErrorFile.php';
    exit;
}

/**
 * ColdFusion ParagraphFormat equivalent
 * Converts double newlines to <p> tags and single newlines to <br>
 */
function paragraphFormat($text) {
    $text = trim((string)$text);
    if ($text === '') return '';
    $text = str_replace("\r\n", "\n", $text);
    $text = str_replace("\r", "\n", $text);
    // Double newlines become paragraph breaks
    $paragraphs = preg_split('/\n{2,}/', $text);
    $result = '';
    foreach ($paragraphs as $p) {
        $p = nl2br(trim($p));
        $result .= "<p>{$p}</p>\n";
    }
    return $result;
}

/**
 * Port of CF_MakeLinks custom tag
 * Converts URLs in text to clickable links, images to <img> tags,
 * and emoticon strings to emoji images
 */
function makeLinks($text, $protos = 'http,https,ftp,telnet,gopher,mailto') {
    $input = (string)$text;
    $input = str_replace('</p>', ' ', $input);

    $protoList = explode(',', $protos);
    $raw = [];

    // Find URLs for each protocol
    foreach ($protoList as $proto) {
        $proto = trim($proto);
        $prefix = ($proto === 'mailto') ? $proto . ':' : $proto . '://';
        $pos = 0;
        while (($found = stripos($input, $prefix, $pos)) !== false) {
            // Extract the URL token (until whitespace)
            $rest = substr($input, $found);
            if (preg_match('/^(\S+)/', $rest, $m)) {
                $raw[] = $m[1];
                $pos = $found + strlen($m[1]);
            } else {
                break;
            }
        }
    }

    // Refine URLs - strip trailing punctuation
    foreach ($raw as &$url) {
        while (strlen($url) > 0) {
            $last = substr($url, -1);
            if (in_array($last, [',', ';', ':', '.', ')', '('])) {
                $url = substr($url, 0, -1);
            } else {
                break;
            }
        }
    }
    unset($url);

    // Replace URLs with HTML
    $out = $input;
    foreach ($raw as $url) {
        $isGif = (stripos($url, '.gif') !== false);
        $isJpg = (stripos($url, '.jpg') !== false);
        if ($isGif || $isJpg) {
            $out = str_replace($url, '<img src="' . $url . '">', $out);
            // Clean up nested tags
            $out = str_ireplace('<img src=<img src=', '<img src=', $out);
            $out = str_ireplace('>>', '>', $out);
        } else {
            $out = str_replace($url, '<a target="new" href="' . $url . '">' . $url . '</a>', $out);
        }
    }

    // Emoticon replacements
    $emoticons = [
        ':-)'  => '<img src="happy.gif">',
        ';-)'  => '<img src="wink.gif">',
        ':-('  => '<img src="sad.gif">',
        ';)'   => '<img src="wink.gif">',
        ':('   => '<img src="sad.gif">',
        ':-D'  => '<img src="icon_smile_big.gif">',
        ':D'   => '<img src="icon_smile_big.gif">',
        '8-)'  => '<img src="icon_smile_cool.gif">',
        '8)'   => '<img src="icon_smile_cool.gif">',
        ']:o(' => '<img src="fire.gif">',
        ']:o)' => '<img src="evilgrin.gif">',
        '@.@'  => '<img src="rolleyes.gif">',
        '8-o'  => '<img src="surprised.gif">',
        '):)'  => '<img src="heart.gif">',
        ':lol:' => '<img src="laugh.gif">',
        '8-O'  => '<img src="scared.gif">',
    ];
    foreach ($emoticons as $code => $img) {
        $out = str_replace($code, $img, $out);
    }

    // Handle paragraph vs line break output
    if (substr(trim($out), 0, 3) === '<P>') {
        $out = str_replace(' ', ' ', $out);
    } else {
        $out = str_replace(["\r\n", "\n"], '<br>', $out);
    }

    return $out;
}

/**
 * Build parameterized search criteria for dynamic WHERE clauses
 * Port of CurrentSearch_AppendCriteria.cfm
 *
 * @return array ['sql' => string, 'params' => array]
 */
function buildSearchCriteria($fieldName, $fieldType, $operator, $value) {
    $sql = '';
    $params = [];
    $fieldType = strtoupper($fieldType);

    if (in_array($fieldType, ['CHAR', 'MEMO'])) {
        switch (strtoupper($operator)) {
            case 'EQUAL':
                $sql = "{$fieldName} = ?";
                $params[] = $value;
                break;
            case 'NOT_EQUAL':
                $sql = "{$fieldName} <> ?";
                $params[] = $value;
                break;
            case 'GREATER_THAN':
                $sql = "{$fieldName} > ?";
                $params[] = $value;
                break;
            case 'SMALLER_THAN':
                $sql = "{$fieldName} < ?";
                $params[] = $value;
                break;
            case 'CONTAINS':
                $sql = "{$fieldName} LIKE ?";
                $params[] = '%' . $value . '%';
                break;
            case 'BEGINS_WITH':
                $sql = "{$fieldName} LIKE ?";
                $params[] = $value . '%';
                break;
            case 'ENDS_WITH':
                $sql = "{$fieldName} LIKE ?";
                $params[] = '%' . $value;
                break;
        }
    } elseif (in_array($fieldType, ['INT', 'FLOAT', 'BIT', 'DATETIME'])) {
        switch (strtoupper($operator)) {
            case 'EQUAL':
                $sql = "{$fieldName} = ?";
                $params[] = $value;
                break;
            case 'NOT_EQUAL':
                $sql = "{$fieldName} <> ?";
                $params[] = $value;
                break;
            case 'GREATER_THAN':
                $sql = "{$fieldName} > ?";
                $params[] = $value;
                break;
            case 'SMALLER_THAN':
                $sql = "{$fieldName} < ?";
                $params[] = $value;
                break;
        }
    }

    return ['sql' => $sql, 'params' => $params];
}

/**
 * Send an email using PHP mail() with configured SMTP
 * Centralizes email sending previously scattered across send*.cfm files
 */
function sendEmail($to, $from, $subject, $body, $fromName = '') {
    if (empty($fromName)) {
        $fromName = DEFAULT_FROM_NAME;
    }
    $headers = "From: {$fromName} <{$from}>\r\n";
    $headers .= "Reply-To: {$from}\r\n";
    $headers .= "MIME-Version: 1.0\r\n";
    $headers .= "Content-Type: text/html; charset=UTF-8\r\n";

    return mail($to, $subject, $body, $headers);
}