<?php
include_once("peter_db.php");
$peter_db = new peter_db();
$c = $peter_db -> getConnection();

// Establish database connection
//$c = new mysqli($DBServer, $DBUser, $DBPass, $DBName);

//if ($c->connect_error) { die('Database connection failed: ' . $c->connect_error ); }
//if (!mysqli_select_db($c, $DBName)) { die("Uh oh, couldn't select database $DBName"); }
mysqli_set_charset($c, 'utf8');

$DEBUG = 0;
function p($s) { echo "<p>{$s}</p>\n"; }
function p2($val){ echo '<pre>'; print_r($val); echo "</pre>\n"; }
function ok($str) { global $c; return mysqli_real_escape_string($c, strip_tags($str, '<p><br><ul><ol><li><b><i><strong><em>')); }
function okh($str) { global $c; return mysqli_real_escape_string($c, $str); }
function sanitizeAndValidate($s) { return okh($s); }
function unescape_commas($s) { return preg_replace('/\[CMA\]/', ',', $s); }

/*function single_row_select($qry, $j=1) { 
    global $c;
    $r = mysqli_query($c, $qry);    d_err($qry);
    $e = mysqli_error($c); if($e) { d_err("sql error: " . $e ); }
    if (!$r) { return $r; }
    $a = mysqli_fetch_assoc($r);
    $e = mysqli_error($c); if($e) { d_err("sql error: " . $e ); }
    if (! $j) { return $a; } return json_encode($a); }
    
function single_row_insert($qry) { global $c;
    $r = mysqli_query($c, $qry);    
    return mysqli_insert_id($c); }

function single_row_update($qry, $j=1) { global $c;
    $r = mysqli_query($c, $qry);    
    return 1; }

function multi_row_select($qry, $j=1) {  global $c; $rows = array();
    $result = mysqli_query($c, $qry);
	while($r = mysqli_fetch_assoc($result)) { $rows[] = $r; }
	if (! $j) { return $rows; } return json_encode( $rows); }
*/

function multi_row_1d($qry) { global $c; 
    $savedQuery = mysqli_query($c, $qry);
    while($savedResult = mysqli_fetch_array($savedQuery)) { $savedArray[] = $savedResult[0]; }
    return $savedArray; }


//     _____ _____ _   _  _____ _      ______          _                ____  _   _ 
//    / ____|_   _| \ | |/ ____| |    |  ____|        (_)              / __ \| \ | |
//   | (___   | | |  \| | |  __| |    | |__        ___ _  __ _ _ __   | |  | |  \| |
//    \___ \  | | | . ` | | |_ | |    |  __|      / __| |/ _` | '_ \  | |  | | . ` |
//    ____) |_| |_| |\  | |__| | |____| |____     \__ \ | (_| | | | | | |__| | |\  |
//   |_____/|_____|_| \_|\_____|______|______|    |___/_|\__, |_| |_|  \____/|_| \_|
//                                                        __/ |                     
//                                                       |___/                      
//   SSO
//
//   Set GLOBAL VARS corresponding to current logged in user. 
//   They may only edit their own dir info. 
//

include('single_sign_on.php');


// Define URL templates and associated SQL queries
$queries = array(
    '/users/{id}' => 'SELECT * FROM conf_users WHERE id = :id',
    '/users' => 'SELECT * FROM conf_users',
    '/sessions' => 'SELECT c.id,c.title,c.desc,c.length,c.starttime,c.track,c.location,c.location_irl,c.mode,c.gets_survey,c.category,c.parent,c.recording,c.instructions,c.image_url,c.is_flex_approved,c.cal_uid,sst.type AS typeStr, sst.id AS type, GROUP_CONCAT(ctg.tag) AS tags FROM conf_sessions c LEFT JOIN conf_sessiontypes sst ON c.type=sst.id LEFT JOIN conf_tagmember ct ON c.id=ct.session LEFT JOIN conf_tags ctg ON ctg.id=ct.tag GROUP BY c.id ORDER BY c.track, c.starttime;',
    '/ses/{day}' => 'SELECT c.id,c.title,c.desc,c.length,c.starttime,c.track,c.location,c.location_irl,c.mode,c.gets_survey,c.category,c.parent,c.recording,c.image_url,c.is_flex_approved,c.cal_uid,sst.type AS typeStr, sst.id AS type, GROUP_CONCAT(ctg.tag) AS tags FROM conf_sessions c LEFT JOIN conf_sessiontypes sst ON c.type=sst.id LEFT JOIN conf_tagmember ct ON c.id=ct.session LEFT JOIN conf_tags ctg ON ctg.id=ct.tag WHERE c.starttime LIKE \'%:day%\' GROUP BY c.id ORDER BY c.track, c.starttime;',
    '/settings' => 'SELECT * FROM conf_uinforecord;'
);

$functions = array(
    '/app' => 'appdata',
    '/start' => 'startup',    
    '/update/activity' => 'set_sessioninfo',
);


if (1) {    //// ($_SERVER['REQUEST_METHOD'] === 'GET') {

    if (isset($_REQUEST['query'])) {
        $requestUrl = '/' . $_REQUEST['query'];             /// $_SERVER['REQUEST_URI'];

        // Check if a matching URL template exists
        // Execute corresponding SQL query based on the request URL
        foreach ($queries as $urlTemplate => $sqlTemplate) {
            $pattern = preg_replace('/{([\-_\w]+)}/', '([\-_\w]+)', $urlTemplate);

            if (preg_match("#^$pattern$#", $requestUrl, $matches)) {
                // Extract parameter values
                $params = array();
                preg_match_all('/{([\-_\w]+)}/', $urlTemplate, $paramNames);
                foreach ($paramNames[1] as $index => $paramName) {
                    $paramValue = $matches[$index + 1];
                    //echo ". . index:" . $index .  ". . paramName:" . $paramName .  ". . paramValue:" . $paramValue . "<br>";
                    
                    // Sanitize and validate the parameter value
                    // Store the sanitized value in the $params array
                    $params[':' . $paramName] = sanitizeAndValidate($paramValue);
                }

                // Prepare the SQL query with the parameter values
                $sql = strtr($sqlTemplate, $params);
                // Execute the SQL query and retrieve data
                //echo "query:" . $sql . "<br>";

                $result = mysqli_query($c, $sql);
                $rows = array();
                while($r = mysqli_fetch_assoc($result)) { $rows[] = $r; }
                $jsonString = json_encode($rows);
                $sizeInBytes = strlen($jsonString);

                echo json_encode(array(
                    "size"   => $sizeInBytes,
                    "result" => "success",
                    //"query" => $sql,
                    "data"  => $rows,
                    "err" => mysqli_error($c)
                ));


            }
        }
        
        foreach ($functions as $urlTemplate => $functionCall) {
            $pattern = preg_replace('/{([\-_\w]+)}/', '([\-_\w]+)', $urlTemplate);

            if (preg_match("#^$pattern$#", $requestUrl, $matches)) {
                // Extract parameter values
                $params = array();
                preg_match_all('/{([\-_\w]+)}/', $urlTemplate, $paramNames);
                foreach ($paramNames[1] as $index => $paramName) {
                    $paramValue = $matches[$index + 1];
                    // Sanitize and validate the parameter value
                    // Store the sanitized value in the $params array
                    $params[':' . $paramName] = sanitizeAndValidate($paramValue);
                }

                $rows = call_user_func($functionCall);
                $jsonString = json_encode($rows);
                $sizeInBytes = strlen($jsonString);

                echo json_encode(array(
                    "size"   => $sizeInBytes,
                    "result" => "success",
                    "data"  => $rows,
                    "err" => mysqli_error($c)
                ));


            }
        }
    }
} /*elseif ($_SERVER['REQUEST_METHOD'] === 'POST') {
    // Handle updates / inserts
    $tableName = $_GET['table'];
    $postData = $_POST;
    $recordId = isset($postData['id']) ? $postData['id'] : null;

    $date = date('Y-m-d H:i:s');
    $columns = explode(',', $_REQUEST['cols']);
    $values = explode(',', $_REQUEST['vals']);
    $values = array_map('unescape_commas', $values);
    $columnValuePairs = array_combine($columns, $values);
    
    // Build the update/insert query
    if ($recordId) {
        $query = "UPDATE $tableName SET ";
        $query .= join(", ", array_map(function ($column, $value) {
            return okh($column) . " = '" . okh($value) . "'";
        }, array_keys($columnValuePairs), $columnValuePairs));
        $query .= ", changed = '$date'";
        $query .= " WHERE id = $recordId";
    } else {
        $query = "INSERT INTO $tableName (";
        $query .= join(", ", array_map('okh', $columns));
        $query .= ", changed) VALUES ('";
        $query .= join("', '", array_map('okh', $values));
        $query .= "', '$date')";
    }
    
    // Execute the query
    echo "Query: " . $query . "<br>";
    exit();
    $r = mysqli_query($c, $query);
    echo json_encode(array(
        "rawvalstr" => $_REQUEST['vals'],
        "result" => "success",
        "action" => ($recordId ? "updated" : "inserted"),
        "logaction" => $logaction,
        "query" => $query,
        "err" => mysqli_error($c)
    ));
    exit();


} */

function startup() {
    global $USER;
    $ddd = multi_row_select('SELECT * FROM gavi_departments ORDER BY name',0);
    $ttt = multi_row_select('SELECT * FROM gavi_titles ORDER BY name',0);
    $rrr = multi_row_select("SELECT * FROM gavi_roles ORDER BY 'descr'",0);
    $ccc = multi_row_select('SELECT * FROM gavi_committees ORDER BY name',0);
    $sss = multi_row_select('SELECT * FROM conf_sessiontypes ORDER BY id',0);
    $aya = multi_row_select('SELECT * FROM conf_academicyears ORDER BY id',0);
    $set = multi_row_select('SELECT id,label,value FROM conf_uinforecord',0);
    $ppp = multi_row_select("SELECT * FROM `conf_sessions` WHERE `type` = '20' OR `type` = '21' ORDER BY starttime",0);

    $SET = array();
    foreach ($set as $setting) {
        $SET[$setting['label']] = $setting['value'];
    }
    echo json_encode(  array( 'user'=>$USER, 'departments'=>$ddd, 'titles'=>$ttt, 'roles'=>$rrr, 'committees'=>$ccc, 
        'sessiontypes'=>$sss, 'settings'=>$SET, 'ay'=>$aya, 'parents'=>$ppp ) );
    exit();
}

function appdata() {
    global $USER;
    
    // mysessions
    $m = multi_row_select("SELECT c.id,c.title,c.desc,c.length,c.starttime,c.track,c.location,c.location_irl,c.mode,c.gets_survey,c.category,c.parent,c.recording,c.instructions,c.image_url,c.is_flex_approved,sst.type,sst.id AS typeId, GROUP_CONCAT(ctg.tag) AS tags FROM conf_sessions c LEFT JOIN conf_signups as sup on c.id=sup.session LEFT JOIN conf_hosts as h ON h.session=c.id JOIN conf_sessiontypes sst ON c.type=sst.id LEFT JOIN conf_tagmember ct ON c.id=ct.session LEFT JOIN conf_tags ctg ON ctg.id=ct.tag WHERE (h.host='{$USER['conf_id']}' OR sup.user='{$USER['conf_id']}') GROUP BY c.id ORDER BY c.track, c.starttime;",0);
    
    // sessions
    $s = multi_row_select('SELECT c.id,c.title,c.desc,c.length,c.starttime,c.track,c.location,c.location_irl,c.mode,c.gets_survey,c.category,c.parent,c.recording,c.instructions,c.image_url,c.is_flex_approved,c.cal_uid,sst.type AS typeStr, sst.id AS type, GROUP_CONCAT(ctg.tag) AS tags FROM conf_sessions c LEFT JOIN conf_sessiontypes sst ON c.type=sst.id LEFT JOIN conf_tagmember ct ON c.id=ct.session LEFT JOIN conf_tags ctg ON ctg.id=ct.tag GROUP BY c.id ORDER BY c.track, c.starttime;',0);
    
    // hosts
    $hh = multi_row_1d("select session FROM conf_hosts WHERE host='{$USER['conf_id']}';"); 
    
    // conferences
    $c = multi_row_select('SELECT * FROM conf_conferences;',0);
    
    $y = multi_row_select('SELECT * FROM conf_academicyears',0);
    
    // options
    $o = multi_row_select('SELECT * FROM conf_uinforecord',0);
    
    echo json_encode(array(
        "mysessions" => $m,
        "sessions" => $s,
        "host" => $hh,
        "user" => $USER,
        "conference" => $c,
        "ay" => $y,
        "options" => $o,
    ));
    exit();
}


// // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // 
// // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // // 
// 
//  Editing of session info
//
function reducer ($memo, $a) { return $memo . "`" . ok($a[0]) . "` = '" . okh($a[1]) . "', "; }

function set_sessioninfo() {
    global $c, $USER;
    $table = 'conf_sessions';
        
    if (isset($_POST['id'])) { 
        $ID = ok($_REQUEST['id']);
        $WHERECLAUSE = " WHERE id={$ID}"; 
        $date = date('Y-m-d H:i:s');
        
        $cols = explode(',', $_REQUEST['cols']);     $vals = explode(',', $_REQUEST['vals']);
        $vals = array_map('unescape_commas', $vals);
        $cv = array_map(null,$cols,$vals);
        $q = array_reduce($cv, 'reducer', "UPDATE `{$table}` SET ");
        $q = substr($q, 0, -2);
        $q .= $WHERECLAUSE;
        single_row_update($q,0);
        echo json_encode( array("rawvalstr"=>$_REQUEST['vals'], "result"=>"success","action"=>"updated", "query"=>$q,"err"=>mysqli_error($c)));
    } else {
        echo json_encode( array("result"=>"fail", "err"=>"no activity id specified") ); }
    exit(); 
}


// Return an appropriate response indicating success or failure
// ...


// Close the database connection
// ...


// later... permission check

    // Check if the user has permission to update the record
    /*if (isset($_POST['id'])) { // Editing another person's data
        if (!check_permission($USER->id, $_POST['id'], 'personnel')) {
            echo json_encode(array("result" => "fail", "err" => "You don't have permission to edit this"));
            exit();
        } else {
            $logaction = log_it("Updating $tableName record with id {$_POST['id']}");
            $recordId = $_POST['id'];
        }
    } else {
        $logaction = log_it("Updating $tableName record");
        $recordId = $USER->id;
    }*/