<?php

/*-- todo ---------------------------//
Writeup how to use the Validate class, add in support for form id checks
Complete the number and date validation
//-----------------------------------*/

class Validate
{
    public $Fields = [];

    public function SetFields($FieldName, $Required, $FieldType, $ErrorMessage, $Options = [])
    {
        $this->Fields[$FieldName]['Type'] = strtolower($FieldType);
        $this->Fields[$FieldName]['Required'] = $Required;
        $this->Fields[$FieldName]['ErrorMessage'] = $ErrorMessage;

        if (!empty($Options['maxlength'])) {
            $this->Fields[$FieldName]['MaxLength'] = $Options['maxlength'];
        }
        if (!empty($Options['minlength'])) {
            $this->Fields[$FieldName]['MinLength'] = $Options['minlength'];
        }
        if (!empty($Options['comparefield'])) {
            $this->Fields[$FieldName]['CompareField'] = $Options['comparefield'];
        }
        if (!empty($Options['allowperiod'])) {
            $this->Fields[$FieldName]['AllowPeriod'] = $Options['allowperiod'];
        }
        if (!empty($Options['allowcomma'])) {
            $this->Fields[$FieldName]['AllowComma'] = $Options['allowcomma'];
        }
        if (!empty($Options['inarray'])) {
            $this->Fields[$FieldName]['InArray'] = $Options['inarray'];
        }
        if (!empty($Options['regex'])) {
            $this->Fields[$FieldName]['Regex'] = $Options['regex'];
        }
    }

    public function ValidateForm($ValidateArray)
    {
        reset($this->Fields);
        foreach ($this->Fields as $FieldKey => $Field) {
            $ValidateVar = $ValidateArray[$FieldKey];

            # todo: Change this to a switch statement
            if ($ValidateVar !== '' || !empty($Field['Required']) || $Field['Type'] === 'date') {
                if ($Field['Type'] === 'string') {
                    if (isset($Field['MaxLength'])) {
                        $MaxLength = $Field['MaxLength'];
                    } else {
                        $MaxLength = 255;
                    }
                    if (isset($Field['MinLength'])) {
                        $MinLength = $Field['MinLength'];
                    } else {
                        $MinLength = 1;
                    }

                    if (strlen($ValidateVar) > $MaxLength) {
                        return $Field['ErrorMessage'];
                    } elseif (strlen($ValidateVar) < $MinLength) {
                        return $Field['ErrorMessage'];
                    }
                } elseif ($Field['Type'] === 'number') {
                    if (isset($Field['MaxLength'])) {
                        $MaxLength = $Field['MaxLength'];
                    } else {
                        $MaxLength = '';
                    }
                    if (isset($Field['MinLength'])) {
                        $MinLength = $Field['MinLength'];
                    } else {
                        $MinLength = 0;
                    }

                    $Match = '0-9';
                    if (isset($Field['AllowPeriod'])) {
                        $Match .= '.';
                    }
                    if (isset($Field['AllowComma'])) {
                        $Match .= ',';
                    }

                    if (preg_match('/[^'.$Match.']/', $ValidateVar) || strlen($ValidateVar) < 1) {
                        return $Field['ErrorMessage'];
                    } elseif ($MaxLength !== '' && $ValidateVar > $MaxLength) {
                        return $Field['ErrorMessage'].'!!';
                    } elseif ($ValidateVar < $MinLength) {
                        return $Field['ErrorMessage']."$MinLength";
                    }
                } elseif ($Field['Type'] === 'email') {
                    if (isset($Field['MaxLength'])) {
                        $MaxLength = $Field['MaxLength'];
                    } else {
                        $MaxLength = 255;
                    }
                    if (isset($Field['MinLength'])) {
                        $MinLength = $Field['MinLength'];
                    } else {
                        $MinLength = 6;
                    }

                    if (!preg_match("/^".EMAIL_REGEX."$/i", $ValidateVar)) {
                        return $Field['ErrorMessage'];
                    } elseif (strlen($ValidateVar) > $MaxLength) {
                        return $Field['ErrorMessage'];
                    } elseif (strlen($ValidateVar) < $MinLength) {
                        return $Field['ErrorMessage'];
                    }
                } elseif ($Field['Type'] === 'link') {
                    if (isset($Field['MaxLength'])) {
                        $MaxLength = $Field['MaxLength'];
                    } else {
                        $MaxLength = 255;
                    }
                    if (isset($Field['MinLength'])) {
                        $MinLength = $Field['MinLength'];
                    } else {
                        $MinLength = 10;
                    }

                    if (!preg_match('/^'.URL_REGEX.'$/i', $ValidateVar)) {
                        return $Field['ErrorMessage'];
                    } elseif (strlen($ValidateVar) > $MaxLength) {
                        return $Field['ErrorMessage'];
                    } elseif (strlen($ValidateVar) < $MinLength) {
                        return $Field['ErrorMessage'];
                    }
                } elseif ($Field['Type'] === 'username') {
                    if (isset($Field['MaxLength'])) {
                        $MaxLength = $Field['MaxLength'];
                    } else {
                        $MaxLength = 20;
                    }
                    if (isset($Field['MinLength'])) {
                        $MinLength = $Field['MinLength'];
                    } else {
                        $MinLength = 1;
                    }

                    if (!preg_match(USERNAME_REGEX, $ValidateVar)) {
                        return $Field['ErrorMessage'];
                    } elseif (strlen($ValidateVar) > $MaxLength) {
                        return $Field['ErrorMessage'];
                    } elseif (strlen($ValidateVar) < $MinLength) {
                        return $Field['ErrorMessage'];
                    }
                } elseif ($Field['Type'] === 'checkbox') {
                    if (!isset($ValidateArray[$FieldKey])) {
                        return $Field['ErrorMessage'];
                    }
                } elseif ($Field['Type'] === 'compare') {
                    if ($ValidateArray[$Field['CompareField']] !== $ValidateVar) {
                        return $Field['ErrorMessage'];
                    }
                } elseif ($Field['Type'] === 'inarray') {
                    if (array_search($ValidateVar, $Field['InArray']) === false) {
                        return $Field['ErrorMessage'];
                    }
                } elseif ($Field['Type'] === 'regex') {
                    if (!preg_match($Field['Regex'], $ValidateVar)) {
                        return $Field['ErrorMessage'];
                    }
                }
            }
        } // while
    } // function

    /**
     * Extension Parser
     *
     * Takes an associative array of file types and extension, e.g.,
     * $Archives = [
     *   '7z'     => ['7z'],
     *   'bzip2'  => ['bz2', 'bzip2'],
     *   'gzip'   => ['gz', 'gzip', 'tgz', 'tpz'],
     *   ...
     * ];
     *
     * Then it finds all the extensions in a torrent file list,
     * organizes them by file size, and returns the heaviest match.
     *
     * That way, you can have, e.g., 5 GiB FASTQ sequence data in one file,
     * and 100 other small files, and get the format of the actual data.
     *
     * todo: Incorporate into $this->ValidateForm (remove if statements first)
     */
    public function ParseExtensions($FileList, $Category, $FileTypes)
    {
        # Sort $Tor->file_list() output by size
        $UnNested = array_values($FileList[1]);
        $Sorted = (usort($UnNested, function ($a, $b) {
            return $b <=> $a;
        })) ? $UnNested : null;  # Ternary wrap because ↑ returns true
        
        # Harvest the wheat
        # todo: Entries seem duplicated here
        $Heaviest = array_slice($Sorted, 0, 20);
        $Matches = [];

        foreach ($Heaviest as $Heaviest) {
            # Collect the last 2 period-separated tokens
            $Extensions = array_slice(explode('.', strtolower($Heaviest[1])), -2, 2);
            $Matches = array_merge($Extensions);

            # Distill the file format
            $FileTypes = $FileTypes[$Category];
            $FileTypeNames = array_keys($FileTypes);

            # todo: Find the smallest possible number of iterations
            # todo: Reduce nesting by one level
            foreach ($Matches as $Match) {
                $Match = strtolower($Match);
        
                foreach ($FileTypeNames as $FileTypeName) {
                    $SearchMe = [ $FileTypeName, $FileTypes[$FileTypeName] ];
        
                    if (in_array($Match, $SearchMe[1])) {
                        return $SearchMe[0];
                        break;
                    }
                }
            }
        }
    }

    public function GenerateJS($FormID)
    {
        /*
        $ReturnJS = "<script type=\"text/javascript\" language=\"javascript\">\r\n";
        $ReturnJS .= "function formVal() {\r\n";
        $ReturnJS .= "  clearErrors('$FormID');\r\n";

        reset($this->Fields);
        foreach ($this->Fields as $FieldKey => $Field) {
            if ($Field['Type'] === 'string') {
                $ValItem = '  if ($(\'#'.$FieldKey.'\').raw().value === ""';
                if (!empty($Field['MaxLength'])) {
                    $ValItem .= ' || $(\'#'.$FieldKey.'\').raw().value.length > '.$Field['MaxLength'];
                } else {
                    $ValItem .= ' || $(\'#'.$FieldKey.'\').raw().value.length > 255';
                }
                if (!empty($Field['MinLength'])) {
                    $ValItem .= ' || $(\'#'.$FieldKey.'\').raw().value.length < '.$Field['MinLength'];
                }
                $ValItem .= ') { return showError(\''.$FieldKey.'\',\''.$Field['ErrorMessage'].'\'); }'."\r\n";
            } elseif ($Field['Type'] === 'number') {
                $Match = '0-9';
                if (!empty($Field['AllowPeriod'])) {
                    $Match .= '.';
                }
                if (!empty($Field['AllowComma'])) {
                    $Match .= ',';
                }

                $ValItem = '  if ($(\'#'.$FieldKey.'\').raw().value.match(/[^'.$Match.']/) || $(\'#'.$FieldKey.'\').raw().value.length < 1';
                if (!empty($Field['MaxLength'])) {
                    $ValItem .= ' || $(\'#'.$FieldKey.'\').raw().value/1 > '.$Field['MaxLength'];
                }
                if (!empty($Field['MinLength'])) {
                    $ValItem .= ' || $(\'#'.$FieldKey.'\').raw().value/1 < '.$Field['MinLength'];
                }
                $ValItem .= ') { return showError(\''.$FieldKey.'\',\''.$Field['ErrorMessage'].'\'); }'."\r\n";
            } elseif ($Field['Type'] === 'email') {
                $ValItem = '  if (!validEmail($(\'#'.$FieldKey.'\').raw().value)';
                if (!empty($Field['MaxLength'])) {
                    $ValItem .= ' || $(\'#'.$FieldKey.'\').raw().value.length > '.$Field['MaxLength'];
                } else {
                    $ValItem .= ' || $(\'#'.$FieldKey.'\').raw().value.length > 255';
                }
                if (!empty($Field['MinLength'])) {
                    $ValItem .= ' || $(\'#'.$FieldKey.'\').raw().value.length < '.$Field['MinLength'];
                } else {
                    $ValItem .= ' || $(\'#'.$FieldKey.'\').raw().value.length < 6';
                }
                $ValItem .= ') { return showError(\''.$FieldKey.'\',\''.$Field['ErrorMessage'].'\'); }'."\r\n";
            } elseif ($Field['Type'] === 'link') {
                $ValItem = '  if (!validLink($(\'#'.$FieldKey.'\').raw().value)';
                if (!empty($Field['MaxLength'])) {
                    $ValItem .= ' || $(\'#'.$FieldKey.'\').raw().value.length > '.$Field['MaxLength'];
                } else {
                    $ValItem .= ' || $(\'#'.$FieldKey.'\').raw().value.length > 255';
                }
                if (!empty($Field['MinLength'])) {
                    $ValItem .= ' || $(\'#'.$FieldKey.'\').raw().value.length < '.$Field['MinLength'];
                } else {
                    $ValItem .= ' || $(\'#'.$FieldKey.'\').raw().value.length < 10';
                }
                $ValItem .= ') { return showError(\''.$FieldKey.'\',\''.$Field['ErrorMessage'].'\'); }'."\r\n";
            } elseif ($Field['Type'] === 'username') {
                $ValItem = '  if ($(\'#'.$FieldKey.'\').raw().value.match(/[^a-zA-Z0-9_\-]/)';
                if (!empty($Field['MaxLength'])) {
                    $ValItem .= ' || $(\'#'.$FieldKey.'\').raw().value.length > '.$Field['MaxLength'];
                }
                if (!empty($Field['MinLength'])) {
                    $ValItem .= ' || $(\'#'.$FieldKey.'\').raw().value.length < '.$Field['MinLength'];
                }
                $ValItem .= ') { return showError(\''.$FieldKey.'\',\''.$Field['ErrorMessage'].'\'); }'."\r\n";
            } elseif ($Field['Type'] === 'regex') {
                $ValItem = '  if (!$(\'#'.$FieldKey.'\').raw().value.match('.$Field['Regex'].')) { return showError(\''.$FieldKey.'\',\''.$Field['ErrorMessage'].'\'); }'."\r\n";
            } elseif ($Field['Type'] === 'date') {
                $DisplayError = $FieldKey.'month';
                if (isset($Field['MinLength']) && $Field['MinLength'] === 3) {
                    $Day = '$(\'#'.$FieldKey.'day\').raw().value';
                    $DisplayError .= ",{$FieldKey}day";
                } else {
                    $Day = '1';
                }
                $DisplayError .= ",{$FieldKey}year";
                $ValItemHold = '  if (!validDate($(\'#'.$FieldKey.'month\').raw().value+\'/\'+'.$Day.'+\'/\'+$(\'#'.$FieldKey.'year\').raw().value)) { return showError(\''.$DisplayError.'\',\''.$Field['ErrorMessage'].'\'); }'."\r\n";

                if (empty($Field['Required'])) {
                    $ValItem = '  if ($(\'#'.$FieldKey.'month\').raw().value !== ""';
                    if (isset($Field['MinLength']) && $Field['MinLength'] === 3) {
                        $ValItem .= ' || $(\'#'.$FieldKey.'day\').raw().value !== ""';
                    }
                    $ValItem .= ' || $(\'#'.$FieldKey.'year\').raw().value !== "") {'."\r\n";
                    $ValItem .= $ValItemHold;
                    $ValItem .= " }\r\n";
                } else {
                    $ValItem .= $ValItemHold;
                }
            } elseif ($Field['Type'] === 'checkbox') {
                $ValItem = '  if (!$(\'#'.$FieldKey.'\').checked) { return showError(\''.$FieldKey.'\',\''.$Field['ErrorMessage'].'\'); }'."\r\n";
            } elseif ($Field['Type'] === 'compare') {
                $ValItem = '  if ($(\'#'.$FieldKey.'\').raw().value!==$(\'#'.$Field['CompareField'].'\').raw().value) { return showError(\''.$FieldKey.','.$Field['CompareField'].'\',\''.$Field['ErrorMessage'].'\'); }'."\r\n";
            }

            if (empty($Field['Required']) && $Field['Type'] !== 'date') {
                $ReturnJS .= '  if ($(\'#'.$FieldKey.'\').raw().value!=="") {'."\r\n ";
                $ReturnJS .= $ValItem;
                $ReturnJS .= "  }\r\n";
            } else {
                $ReturnJS .= $ValItem;
            }
            $ValItem = '';
        }

        $ReturnJS .= "}\r\n";
        $ReturnJS .= "</script>\r\n";
        return $ReturnJS;
        */
    }
}