<?php

class JsonToForm
{
    /**
     *   ## Help Constants and Functions ------------------------------------------------
     *   ////////////////////////////////////////////////////////////////////////////////
     *
     *   // Cache fields options (json format) ////////////////////////////////////////
     *   // ---------------------------------------------------------------------------
     *   $formJSON = file_get_contents('config/kallassa.json');
     *   define("FORMJSON", $formJSON);
     *
     *   // Cache CCODE attributes (json format) //////////////////////////////////////
     *   // ---------------------------------------------------------------------------
     *   $codeJSON = file_get_contents('config/ccode.json');
     *   define("CODEJSON", $codeJSON);
     *
     *   // Parse anythig from a field ////////////////////////////////////////////////
     *   // ARGS:
     *   //    $fkey   = keyname (as in json fields oprions)
     *   //    $inp    = input value (string)
     *   // RETURN: array(
     *   //    'label' = field label,
     *   //    'multi' = (true|false) is multiple choice (select|radio|check) or not,
     *   //    'value' = human readable value (or array of values if multi)
     *   // ) -------------------------------------------------------------------------
     */
    public static function parse_any($fkey, $inp ="")
    {
         $formARRAY = json_decode(FORMJSON);

         foreach ($formARRAY as $key => $section) {
            foreach ($section->childs as $kk => $field) {

                // find the field
                if ($field->nam == $fkey) {

                    $values = array();    // human readble values if select (comma separated)

                    if ($field->typ == 'select') {
                    $multi = true;

                    if ($inp !='') {
                        $codes = explode(",", $inp);    // split coded values
                        foreach ($field->opt as $kkk => $v) {
                            if (in_array($v->id, $codes)) {   // check if option is in array
                                $values[] = ($field->nam == 'ccode') ? ($v->id.": ".$v->tag) : $v->tag;
                            }
                        }
                    }

                    }
                    else $multi = false;

                    // return everything in an array
                    return  array(
                            'label' => $field->lab,
                            'multi' => $multi,
                            'value' => ($multi ? $values : $inp)
                            );
                }
            }
         }

        // if not escaped already, then name return same
        return    array('label' => $fkey, 'multi' => false, 'value' => $inp );
    }


    // Parse anythig from ccode
    public static function parse_ccode($ckey) {
        $ccARRAY = json_decode(CODEJSON);

        foreach ($ccARRAY as $key => $val) {
            // find the field
            if ($val->id == $ckey) {
                // return everything in an array
                return  $val;
            }
        }
    }


    // Get totals of alla categories /////////////////////////////////////////////
    // RETURN array of items (value) per category (array key)
    // ---------------------------------------------------------------------------
    public static function get_totals() {
        $result = array();
        $sum = 0;

        $dbc = new mysqli(DB_HOST, DB_USER, DB_PASS, DB_DBMS);
        if ($dbc->connect_errno) {
            echo "Database connection failed; Please try in a few minutes. ";
            if (TESTING) echo $dbc->connect_error;
            $dbc->close(); die();
        }
        $dbc->set_charset("utf8");

        // prepare statemet
        $stm = $dbc->prepare("SELECT ccode, count(id) total FROM `items` GROUP BY ccode");
        $stm->execute();               // execute query
        $stm->store_result();          // store result
        $stm->bind_result($c, $tot);
        while ($stm->fetch()) {
            // using md5() you can have any unicode string as key ;)
            // credit: https://stackoverflow.com/questions/10696067/characters-allowed-in-php-array-keys -> Rob's answer
            // but newer versions of php (v7+) seem to handle unicide keys nicely
                $result[$c] = $tot;
            $sum += $tot;
            }

        $result['all'] = $sum;

        return $result;
    }


    // Preview Local Datetime ////////////////////////////////////////////////////
    // (in Greek format and names )
    // ---------------------------------------------------------------------------
    public static function local_dt($t) {
        $day  = array("Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat");
        $dayL = array("Κυρ", "Δευ", "Τρι", "Τετ", "Πεμ", "Παρ", "Σαβ");
        $mon  = array("Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec");
        $monL = array("Ιαν", "Φεβ", "Μαρ", "Απρ", "Μαϊ", "Ιουν", "Ιουλ", "Αυγ", "Σεπ", "Οκτ", "Νοε", "Δεκ");
        $tm   = array("am", "pm");
        $tmL  = array("πμ", "μμ");
        $r = date("D. j M. Y, h:i:sa", $t);
        $r = str_replace($day, $dayL, $r);
        $r = str_replace($mon, $monL, $r);
        $r = str_replace($tm, $tmL, $r);
        return $r;
    }


    // Part of string
    // UTF-8 SAFE
    public static function str_part($str, $len) {
        return (mb_strlen($str) > $len) ? mb_substr($str, 0, $len-1) ."…" : $str;
    }


    public static function make_a_form($form)
    {
        $formJson = json_decode(json_encode($form));

        $default_outer = $form->defaults->outer_class ?? '';
        $default_inner = $form->defaults->inner_class ?? '';
        $default_type = $form->defaults->type ?? 'text';

        // TODO handle $form->defaults->source;

        // Script Workflow:
        // ---------------------------------------------------------------------------
        // 1. read fields options
        // 2. generate HTML
        // 3. generate JS needed

        // the UI
        // ---------------------------------------------------------------------------
        // Fields are grouped in sections
        // These sections presented in tabs (or accordion if mobile device)
        // Two (2) sections incduded to inform the user of empty fields or errors

        // Libraries and FrameWorks used
        // ---------------------------------------------------------------------------
        // Bootstrap 4.3 is used for easy responsive HTML code
        // JQuery 3.3 is used to handle user interation
        // Select2 is used to make select-boxes (single or multiple) easier to use

        // read fields options (json format) /////////////////////////////////////////
        // ---------------------------------------------------------------------------

        // Init strigns for JS generator (needed to handle everything) ///////////////
        // ---------------------------------------------------------------------------
        $checkFilledJS = "";    // JS for checking empty fields
        $ref2Select2JS = "";    // references to Select2-controls Javascript
        $initSelectsJS = "";    // js to initialize select fields (single or multiple)


        $html = '';

        foreach ($formJson->form as $key => $field) {

            $attributes = $field->attributes ?? [];         // attributes array
            $type = $field->type ?? $default_type;
            $class = $field->class ?? "";
            $label = $field->label;
            $name = $field->name ?? "$field->label";

            // TODO: auto value

            $appendKey = in_array('append-key', $attributes) ? true : false;        // append key (for selects)
            $required = in_array('required', $attributes) ? 'required' : '';        // required
            $asterisk = in_array('required', $attributes) ? '*' : '';       // asterisk in label if required
            

            $html .= "
            <div class='form-group {$class}'>
                <label for='{$name}'>{$label} {$asterisk}</label>
                ";
            
            switch ($type) {

                case 'select':                         

                    if (in_array('multiple', $attributes)) {      // if select is multiple

                        $html .="
                            <select id='{$name}' class='form-select form-select-sm' name='{$name}[]' multiple='multiple' style='width:100%'>";

                        // prepare initialization of select2 (multiple)
                        $initSelectsJS .= "
                            var {$name} = $('#{$name}');
                            {$name}.select2({ width: '100%', placeholde: '{$label}' });";

                        // prepare check if empty field
                        $checkFilledJS .= "
                            if (getValues({$name}) =='') { empty += '{$label} {$asterisk}<br />'; }
                            values.{$name} = getValues($name);";


                    } else {    // select is single; draw select + add empty option

                        $html .="
                            <select id='{$name}' class='form-select form-select-sm' name='{$name}' style='width:100%'>
                            <option value='0'>(επιλέξτε)</option>";

                        // // prepare initialization of select2 (single)
                        // $initSelectsJS .= "
                        //     var {$name} = $('#{$name}');
                        //     {$name}.select2({ allowClear: true });";

                        // prepare check if empty field
                        $checkFilledJS .= "
                            if (getValues({$name}) =='') { empty += '{$label} {$asterisk}<br />'; }
                            values.{$name} = getValues($name);";
                        
                    }

                    // inject options
                    if (isset($field->options)) {
                    foreach ($field->options as $key => $val) {
                        $html .= "
                            <option value='{$key}'>{$val}</option>";
                    }}

                    // close select
                    $html .= "</select>";

                    break;


                case 'text':

                    $html .= "
                        <input type='text' class='form-control form-control-sm' name='{$name}' {$required}>";

                    $checkFilledJS = "
                        if ($('input[name={$name}]').val() =='') { empty += '{$label} {$asterisk}<br />'; }
                        values.{$name} = $('input[name={$name}]').val();";

                    break;


                case 'password':

                    $html .= "
                        <input type='password' class='form-control form-control-sm' name='{$name}' {$required}>";

                    $checkFilledJS = "
                        if ($('input[name={$name}]').val() =='') { empty += '{$label} {$asterisk}<br />'; }
                        values.{$name} = $('input[name={$name}]').val();";

                    break;

                            
                case 'integer':

                    $html .= "
                        <input type='number' class='form-control form-control-sm' name='{$name}' min='0' step='1' {$required}>";

                    $checkFilledJS .= "
                        if ($('input[name={$name}]').val() =='') { empty += '{$label} {$asterisk}<br />'; }
                        values.{$name} = $('input[name={$name}]').val();";

                    break;


                case 'textarea':

                    $html .= "
                        <textarea class='form-control form-control-sm' name='{$name}' {$required}></textarea>";

                    $checkFilledJS .= "
                        if ($('textarea[name={$name}]').val() =='') { empty += '{$label} {$asterisk}<br />'; }
                        values.{$name} = $('textarea[name={$name}]').val();";

                    break;
                    

                case 'date':

                    $html .= "
                        <input type='date' class='form-control form-control-sm' name='{$name}' {$required}>";

                    $checkFilledJS .= "
                        if ($('input[name={$name}]').val() =='') { empty += '{$label} {$asterisk}<br />'; }
                        values.{$name} = $('input[name={$name}]').val();";

                    break;


                case 'email':

                    $html .= "
                        <input type='email' class='form-control form-control-sm' name='{$name}' {$required}>";

                    $checkFilledJS .= "
                        if ($('input[name={$name}]').val() =='') { empty += '{$label} {$asterisk}<br />'; }
                        values.{$name} = $('input[name={$name}]').val();";

                    break;


                default:    // label, acts as common text

                    //$html .= "<label>{$label}</label";
                    

            }

            $html .= '</div>';
        }

        return [
            'html' => $html,
            'init_js' => $initSelectsJS,
            'values_js' => $checkFilledJS
        ];

    }

}


      /*****
        // Script Workflow:
        // ---------------------------------------------------------------------------
        // 1. read fields options
        // 2. generate HTML
        // 3. generate JS needed

        // the UI
        // ---------------------------------------------------------------------------
        // Fields are grouped in sections
        // These sections presented in tabs (or accordion if mobile device)
        // Two (2) sections incduded to inform the user of empty fields or errors

        // Libraries and FrameWorks used
        // ---------------------------------------------------------------------------
        // Bootstrap 4.3 is used for easy responsive HTML code
        // JQuery 3.3 is used to handle user interation
        // Select2 is used to make select-boxes (single or multiple) easier to use


        // read fields options (json format) /////////////////////////////////////////
        // ---------------------------------------------------------------------------
        $formJSON = file_get_contents('config/kallassa.json');
        $formARRAY = json_decode($formJSON);


        // Init strigns for JS generator (needed to handle everything) ///////////////
        // ---------------------------------------------------------------------------
        $checkFilledJS = "";    // JS for checking empty fields
        $ref2Select2JS = "";    // references to Select2-controls Javascript
        $initSelectsJS = "";    // js to initialize select fields (single or multiple)
      */


        /** document header
         * 
         * <!DOCTYPE html>
         * <html prefix="og: http://ogp.me/ns#" xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-GB" lang="en-GB" dir="ltr">
         * <head>
         *     <!-- Metas + Title -->
         *     <meta http-equiv="X-UA-Compatible" content="IE=edge">
         *     <meta name="viewport" content="width=device-width, initial-scale=1">
         *     <meta http-equiv="content-type" content="text/html; charset=utf-8" />
         *                 
         *     <title><?=PROJECT?> : Εισαγωγή Εγγραφής</title>
         *
         *     <!-- CSS needed -->
         *     <link href="https://fonts.googleapis.com/css?family=Ubuntu:400,700&display=swap" rel="stylesheet">
         *     <link rel="stylesheet" href="/css/bootstrap.min.css" /><!-- v4.4.1 -->
         *     <link rel="stylesheet" href="/css/select2.min.css" /><!-- v4.0.10 -->
         *     <link rel="stylesheet" href="/css/pi.css" />
         * </head>
         * <body>
         */


        /** form footer
         * <!-- footer of form -->
         * <div class="row">
         *
         *     <div class="col-md-4 line-right">
         *         <h3>Δεν έχουν συμπληρωθεί:</h3>
         *         <div id="empty-fields"></div>
         *     </div>
         *  
         *     <div class="col-md-8">
         *   
         *         <!-- custom field -->
         *         <div class="form-group">
         *           <label for="more">Συμπληρωματική Πληροφορία</label>
         *           <textarea name="note" class="form-control form-control-sm tall"></textarea>
         *           <?php
         *           // append js code
         *           // for checking if field is empty
         *           // and attaching value to json data
         *           $checkFilledJS .= "
         *               if ($('textarea[name=note]').val() =='') {
         *                 empty += '<span>Γενικά:</span>Συμπληρωματική Πληροφορία<br />';
         *               }
         *               values.note = $('textarea[name=note]').val();
         *           ";
         *           ?>
         *         </div>
         *     
         *         <div class="form-group">
         *           <input class="btn btn-primary" type="submit" value="Καταχώρηση Εγγραφής">
         *         </div>
         *     </div>
         * </div>
         */

        
        /** post-DOM-end + scripts
         * 
         * </form>
         * </div>
         * <!-- DOM ENDS HERE -->
         * 
         *   <!-- scripts and libraries
         *   load and register one by one, so you don't need to worry about if they are ready -->
         * <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
         * <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-migrate/1.4.1/jquery-migrate.min.js"></script>
         * <script src="/js/bootstrap.min.js"></script>
         * <script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/select2.full.min.js"></script>
         * <script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.10/js/i18n/el.js"></script>
         * <script>
         * // NOW RUN EVERYTHING AFTER JQUERY (AND DOM ready)
         * // -----------------------------------------------------------------------------
         * ////////////////////////////////////////////////////////////////////////////////
         * 
         *   // 00. FLAGS and NEEDED FUNCTIONS
         *   // ---------------------------------------------------------------------------
         *   //////////////////////////////////////////////////////////////////////////////
         * 
         *   var waitingResponse = false;    // flag for an ajax request that was sent and still waiting response
         * 
         *   // pure JS ajax GET request
         *   // return data as JSON
         *   // no fancy things like UTF8; if needed use base64 ---------------------------
         *   function ajax_get(url, callback) {
         *       var xmlhttp = new XMLHttpRequest();
         *       xmlhttp.onreadystatechange = function() {
         *           if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
         * 
         *               try {
         *                   var data = JSON.parse(xmlhttp.responseText);
         *               } catch(err) {
         *                   console.log(err.message + ' in ' + xmlhttp.responseText);
         *                   return;
         *               }
         *               callback(data);
         *           }
         *       };
         * 
         *       xmlhttp.open("GET", url, true);
         *       xmlhttp.send();
         *   }
         * 
         * 
         *   // 01. MENU MANAGEMENT
         *   // ---------------------------------------------------------------------------
         *   //////////////////////////////////////////////////////////////////////////////
         * 
         *   // menu management
         *   // ---------------------------------------------------------------------------
         *   $('.dropdown-item').on('click', function(e){
         *     e.preventDefault();
         * 
         *     if (!waitingResponse) {
         *       waitingResponse = true;
         * 
         *       var r = confirm('Δεν έχετε αποθηκεύσει το τρέχον αντικείμενο!\nΕίστε σίγουροι ότι θέλετε να εγκαταλείψετε τη σελίδα;');
         *       if (r == true) {
         * 
         *         // all data-goto have the format: 'method,uri_address'
         *         // uri_address is the url to call
         *         // method options:
         *         // * url : means goto url (redirect)
         *         // * ajax : means call url via ajax; if 'success = true' then goto '/' after that
         *         // -----------------------------------------------------------------------
         *         var opt = $(this).data('goto').split(',');  // split data-goto
         * 
         *         if (opt[0] == 'url') {    // if method = url
         *           window.location.href = opt[1];
         *         }
         *         else {                    // else, method = ajax
         *           ajax_get(opt[1], function(response) {
         *             if (response.success) {
         *               window.location.href = '/';
         *             }
         *           });
         *         }
         * 
         *       }
         *       else {
         *         // user did not confirmed the selection; do nothing
         *       }
         * 
         *       waitingResponse = false;
         *     }
         * 
         *   });
         * 
         *   // 02. USER INTERFACE
         *   // ---------------------------------------------------------------------------
         *   //////////////////////////////////////////////////////////////////////////////
         * 
         *   // tabs to accorderon --------------------------------------------------------
         *   //////////////////////////////////////////////////////////////////////////////
         * 
         *   // FUNCTION: Set tabsContainer height
         *   // acording to which tab is visible
         *   // and tab mode (tabs|acordeon)
         *   // ---------------------------------------------------------------------------
         *   function set_tabsContainer_height() {
         *       var ch_;      // content height
         *       var tc_base;    // tabs-container base height
         *       tc_base = ($(window).width() > 650) ? 100 : 400;
         *       if ($('#content1').is(':visible'))  ch_ = $('#content1').height();
         *       if ($('#content2').is(':visible'))  ch_ = $('#content2').height();
         *       if ($('#content3').is(':visible'))  ch_ = $('#content3').height();
         *       if ($('#content4').is(':visible'))  ch_ = $('#content4').height();
         *       if ($('#content5').is(':visible'))  ch_ = $('#content5').height();
         *       if ($('#content6').is(':visible'))  ch_ = $('#content6').height();
         * 
         *       $('#tabsContainer').height(ch_ + tc_base);
         * 
         *   }
         *   set_tabsContainer_height();  // init (run for 1st time)
         * 
         *   // on tab selection
         *   // calculate tabsContainer height
         *   $('input:radio[name="tabs"]').change( function(){
         *       set_tabsContainer_height()
         *   });
         * 
         *   // on window change
         *   // set tabsContainer height
         *   $( window ).resize(function() {
         *       set_tabsContainer_height();
         *   });
         * 
         * 
         * 
         *   // 03. form-control form-control-smS
         *   // ---------------------------------------------------------------------------
         *   //////////////////////////////////////////////////////////////////////////////
         * 
         *   // Select2 controls
         *   //////////////////////////////////////////////////////////////////////////////
         * 
         *   // FUNCTION: Get selected value(s) of Select2 control
         *   // pass arg: source-element
         *   // return: value(s) comma-separated
         *   // ---------------------------------------------------------------------------
         *   function getValues(srcElm) {
         *       var res;
         *       var obj = srcElm.select2('data');    // get delected data array
         * 
         *       if (obj.length === 0)    return '';  // if empty list then nothig is selected
         *       else {
         *           var i = 0;
         *           obj.forEach(function(elm){   // loop through object elements array
         * 
         *               if (i)  res += ',' + elm.id; // if not first item, prepend ',' befor value(id)
         *               else    res = elm.id;        // else set (first) checked value
         * 
         *               i++;
         *           });
         *       }
         *       return res;
         *   }
         * 
         *   // patch select2-multiple widths
         *   // ---------------------------------------------------------------------------
         *   $('.select-field').select2({ width: '100%' });
         * 
         *   // init select2 fields
         *   // (embed from php)
         *   // ---------------------------------------------------------------------------
         *   <?=$initSelectsJS?>
         * 
         * 
         *   // 04. FORM-LOGIC
         *   // ---------------------------------------------------------------------------
         *   //////////////////////////////////////////////////////////////////////////////
         * 
         *   // FUNCTION: Report empty fields
         *   // ---------------------------------------------------------------------------
         *   function reportEmpty() {
         *     var empty = '';
         *     var needit = [];
         *     var values = {};
         * 
         *     // embed if-conditions from php
         *     <?=$checkFilledJS?>
         * 
         *     $("#empty-fields").html(empty);   // render empty fields
         * 
         *     // console.log(JSON.stringify(values));
         * 
         *     return { need : needit, data: values };    // return all fields
         *   }
         *   reportEmpty();
         * 
         *   $('form').on('keyup change paste', 'input, select, textarea', function(){
         *       console.log('Form changed!');
         *       reportEmpty();
         *   });
         * 
         *   // validation?
         *   // check: https://www.sitepoint.com/instant-validation/
         * 
         * 
         *   $('#post-form').on('submit', function(e){
         *     e.preventDefault();
         *     if (!waitingResponse) {
         *         waitingResponse = true;
         *         var resp = reportEmpty();
         * 
         *         if (resp.need.length > 0) alert("Tα πεδία:\n\n" + resp.need.join(',\n') + "\n\nείναι υποχρεωτικά!");
         *         else {
         *           // alert('sending: '+JSON.stringify(resp.data));
         *           var postUrl = "/ajax.php?do=additem";   // url to post form
         *           var data2send = resp.data;              // parse data to send
         * 
         *           $.ajax({
         *             type: 'POST',
         *             url: postUrl,    // make sure you respect the same origin policy with this url
         *             data: data2send,
         *             dataType: "text",
         * 
         *             success: function(data) {  // server replies
         *                 var json = $.parseJSON(data);
         *                 if (json.success == true) {   // good! post accepted
         *                     // alert(json.id)
         *                     window.location.href = '/ui-show-item.php?id='+ json.id;
         *                 }
         *                 else {
         *                      alert("Post not accepted.\nPlease check the data you submit.");
         *                      // $('#oc-company-form')[0].reset();
         *                 }
         *             },
         * 
         *             error: function() {
         *               alert('Some ajax error! :(');
         *             }
         *           });
         *         }
         * 
         *         waitingResponse = false;
         *     }
         * 
         *   });
         * 
         * <?php
         *   // bibliography and References
         *   //
         *   // WHICH JQUERY:
         *   // read: https://jquery.com/download/
         *   //
         *   // SELECT2
         *   // https://stackoverflow.com/questions/12889309/get-selected-value-from-multi-value-select-boxes-by-jquery-select2
         *   //
         *   // tests:
         *   // https://jsfiddle.net/3nd1gL8o/1/
         *   // https://jsfiddle.net/3nd1gL8o/5/
         *   //
         *   // EXAMPLE with ALL CASES NEEDed:
         *   // https://jsfiddle.net/v684h0g2/2/
         * ?>
         * </script>
         *   </body>
         * </html>
         */