////////////////////////////////////////////////////
// spellChecker.js
//
// spellChecker object
//
// This file is sourced on web pages that have a textarea object to evaluate
// for spelling. It includes the implementation for the spellCheckObject.
//
// Modified by LUDO (Marc Alier) for integration with the moogle environment
// august 2004 malier@lsi.upc.es
//
////////////////////////////////////////////////////


// constructor
function spellChecker( textObject) {
    // public properties - configurable
    //this.popUpUrl = '/moodle/lib/speller/spellchecker.html';
    this.popUpName = 'spellchecker';
    this.popUpProps = "menu=no,width=440,height=350,top=70,left=120,resizable=yes,status=yes";
    //this.spellCheckScript = '/moodle/lib/speller/server-scripts/spellchecker.php';
    //this.spellCheckScript = '/cgi-bin/spellchecker.pl';

    // values used to keep track of what happened to a word
    this.replWordFlag = "R";    // single replace
    this.ignrWordFlag = "I";    // single ignore
    this.replAllFlag = "RA";    // replace all occurances
    this.ignrAllFlag = "IA";    // ignore all occurances
    this.fromReplAll = "~RA";   // an occurance of a "replace all" word
    this.fromIgnrAll = "~IA";   // an occurance of a "ignore all" word
    // properties set at run time
    this.wordFlags = new Array();
    this.currentTextIndex = 0;
    this.currentWordIndex = 0;
    this.spellCheckerWin = null;
    this.controlWin = null;
    this.wordWin = null;
    this.textArea = textObject; // deprecated
    this.textInputs = arguments;

    this._editor=""; //  BY LUDO
    // private methods
    this._spellcheck = _spellcheck;
    this._getSuggestions = _getSuggestions;
    this._setAsIgnored = _setAsIgnored;
    this._getTotalReplaced = _getTotalReplaced;
    this._setWordText = _setWordText;
    this._getFormInputs = _getFormInputs;

    // public methods
    this.openChecker = openChecker;
    this.startCheck = startCheck;
    this.checkTextBoxes = checkTextBoxes;
    this.checkTextAreas = checkTextAreas;
    this.spellCheckAll = spellCheckAll;
    this.ignoreWord = ignoreWord;
    this.ignoreAll = ignoreAll;
    this.replaceWord = replaceWord;
    this.replaceAll = replaceAll;
    this.terminateSpell = terminateSpell;
    this.undo = undo;

    // set the current window's "speller" property to the instance of this class.
    // this object can now be referenced by child windows/frames.
    window.speller = this;
}

// call this method to check all text boxes (and only text boxes) in the HTML document
function checkTextBoxes() {
    this.textInputs = this._getFormInputs( "^text$" );
    this.openChecker();
}

// call this method to check all textareas (and only textareas ) in the HTML document
function checkTextAreas() {
    this.textInputs = this._getFormInputs( "^textarea$" );
    this.openChecker();
}

// call this method to check all text boxes and textareas in the HTML document
function spellCheckAll() {
    this.textInputs = this._getFormInputs( "^text(area)?$" );
    this.openChecker();
}

// call this method to check text boxe(s) and/or textarea(s) that were passed in to the
// object's constructor or to the textInputs property
function openChecker() {
    this.spellCheckerWin = window.open( this.popUpUrl, this.popUpName, this.popUpProps );
    if( !this.spellCheckerWin.opener ) {
        this.spellCheckerWin.opener = window;
    }
}

function startCheck( wordWindowObj, controlWindowObj ) {

    // set properties from args
    this.wordWin = wordWindowObj;
    this.controlWin = controlWindowObj;

    // reset properties
    this.wordWin.resetForm();
    this.controlWin.resetForm();
    this.currentTextIndex = 0;
    this.currentWordIndex = 0;
    // initialize the flags to an array - one element for each text input
    this.wordFlags = new Array( this.wordWin.textInputs.length );
    // each element will be an array that keeps track of each word in the text
    for( var i=0; i<this.wordFlags.length; i++ ) {
        this.wordFlags[i] = [];
    }

    // start
    this._spellcheck();

    return true;
}

function ignoreWord() {
    var wi = this.currentWordIndex;
    var ti = this.currentTextIndex;
    if( !this.wordWin ) {
        alert( 'Error: Word frame not available.' );
        return false;
    }
    if( !this.wordWin.getTextVal( ti, wi )) {
        alert( 'Error: "Not in dictionary" text is missing.' );
        return false;
    }
    // set as ignored
    if( this._setAsIgnored( ti, wi, this.ignrWordFlag )) {
        this.currentWordIndex++;
        this._spellcheck();
    }
}

function ignoreAll() {
    var wi = this.currentWordIndex;
    var ti = this.currentTextIndex;
    if( !this.wordWin ) {
        alert( 'Error: Word frame not available.' );
        return false;
    }
    // get the word that is currently being evaluated.
    var s_word_to_repl = this.wordWin.getTextVal( ti, wi );
    if( !s_word_to_repl ) {
        alert( 'Error: "Not in dictionary" text is missing' );
        return false;
    }

    // set this word as an "ignore all" word.
    this._setAsIgnored( ti, wi, this.ignrAllFlag );

    // loop through all the words after this word
    for( var i = ti; i < this.wordWin.textInputs.length; i++ ) {
        for( var j = 0; j < this.wordWin.totalWords( i ); j++ ) {
            if(( i == ti && j > wi ) || i > ti ) {
                // future word: set as "from ignore all" if
                // 1) do not already have a flag and
                // 2) have the same value as current word
                if(( this.wordWin.getTextVal( i, j ) == s_word_to_repl )
                && ( !this.wordFlags[i][j] )) {
                    this._setAsIgnored( i, j, this.fromIgnrAll );
                }
            }
        }
    }

    // finally, move on
    this.currentWordIndex++;
    this._spellcheck();
}

function replaceWord() {
    var wi = this.currentWordIndex;
    var ti = this.currentTextIndex;
    if( !this.wordWin ) {
        alert( 'Error: Word frame not available.' );
        return false;
    }
    if( !this.wordWin.getTextVal( ti, wi )) {
        alert( 'Error: "Not in dictionary" text is missing' );
        return false;
    }
    if( !this.controlWin.replacementText ) {
        return;
    }
    var txt = this.controlWin.replacementText;
    if( txt.value ) {
        var newspell = new String( txt.value );
        if( this._setWordText( ti, wi, newspell, this.replWordFlag )) {
            this.currentWordIndex++;
            this._spellcheck();
        }
    }
}

function replaceAll() {
    var ti = this.currentTextIndex;
    var wi = this.currentWordIndex;
    if( !this.wordWin ) {
        alert( 'Error: Word frame not available.' );
        return false;
    }
    var s_word_to_repl = this.wordWin.getTextVal( ti, wi );
    if( !s_word_to_repl ) {
        alert( 'Error: "Not in dictionary" text is missing' );
        return false;
    }
    var txt = this.controlWin.replacementText;
    if( !txt.value ) return;
    var newspell = new String( txt.value );

    // set this word as a "replace all" word.
    this._setWordText( ti, wi, newspell, this.replAllFlag );

    // loop through all the words after this word
    for( var i = ti; i < this.wordWin.textInputs.length; i++ ) {
        for( var j = 0; j < this.wordWin.totalWords( i ); j++ ) {
            if(( i == ti && j > wi ) || i > ti ) {
                // future word: set word text to s_word_to_repl if
                // 1) do not already have a flag and
                // 2) have the same value as s_word_to_repl
                if(( this.wordWin.getTextVal( i, j ) == s_word_to_repl )
                && ( !this.wordFlags[i][j] )) {
                    this._setWordText( i, j, newspell, this.fromReplAll );
                }
            }
        }
    }

    // finally, move on
    this.currentWordIndex++;
    this._spellcheck();
}

function terminateSpell() {
    // called when we have reached the end of the spell checking.
    var msg = "Spell check complete:\n\n";
    var numrepl = this._getTotalReplaced();
    if( numrepl == 0 ) {
        // see if there were no misspellings to begin with
        if( !this.wordWin ) {
            msg = "";
        } else {
            if( this.wordWin.totalMisspellings() ) {
                msg += "No words changed.";
            } else {
                msg += "No misspellings found.";
            }
        }
    } else if( numrepl == 1 ) {
        msg += "One word changed.";
    } else {
        msg += numrepl + " words changed.";
    }
    if( msg ) {
        msg += "\n";
        alert( msg );
    }

    if( numrepl > 0 ) {
        // update the text field(s) on the opener window
        for( var i = 0; i < this.textInputs.length; i++ ) {
            // this.textArea.value = this.wordWin.text;
            if( this.wordWin ) {
                if( this.wordWin.textInputs[i] ) {
                    this.textInputs[i].value = this.wordWin.textInputs[i];
                }
            }
        }
        // START LUDO
        try {
            this._editor.setHTML(this._editor._textArea.value);
        } catch (e) {
                // If were not in editor, just continue.
            }
        //LUDO END
    }

    // return back to the calling window
    this.spellCheckerWin.close();

    return true;
}

function undo() {
    // skip if this is the first word!
    var ti = this.currentTextIndex;
    var wi = this.currentWordIndex

    if( this.wordWin.totalPreviousWords( ti, wi ) > 0 ) {
        this.wordWin.removeFocus( ti, wi );

        // go back to the last word index that was acted upon
        do {
            // if the current word index is zero then reset the seed
            if( this.currentWordIndex == 0 && this.currentTextIndex > 0 ) {
                this.currentTextIndex--;
                this.currentWordIndex = this.wordWin.totalWords( this.currentTextIndex )-1;
                if( this.currentWordIndex < 0 ) this.currentWordIndex = 0;
            } else {
                if( this.currentWordIndex > 0 ) {
                    this.currentWordIndex--;
                }
            }
        } while (
            this.wordWin.totalWords( this.currentTextIndex ) == 0
            || this.wordFlags[this.currentTextIndex][this.currentWordIndex] == this.fromIgnrAll
            || this.wordFlags[this.currentTextIndex][this.currentWordIndex] == this.fromReplAll
        );

        var text_idx = this.currentTextIndex;
        var idx = this.currentWordIndex;
        var preReplSpell = this.wordWin.originalSpellings[text_idx][idx];

        // if we got back to the first word then set the Undo button back to disabled
        if( this.wordWin.totalPreviousWords( text_idx, idx ) == 0 ) {
            this.controlWin.disableUndo();
        }

        // examine what happened to this current word.
        switch( this.wordFlags[text_idx][idx] ) {
            // replace all: go through this and all the future occurances of the word
            // and revert them all to the original spelling and clear their flags
            case this.replAllFlag :
                for( var i = text_idx; i < this.wordWin.textInputs.length; i++ ) {
                    for( var j = 0; j < this.wordWin.totalWords( i ); j++ ) {
                        if(( i == text_idx && j >= idx ) || i > text_idx ) {
                            var origSpell = this.wordWin.originalSpellings[i][j];
                            if( origSpell == preReplSpell ) {
                                this._setWordText ( i, j, origSpell, undefined );
                            }
                        }
                    }
                }
                break;

            // ignore all: go through all the future occurances of the word
            // and clear their flags
            case this.ignrAllFlag :
                for( var i = text_idx; i < this.wordWin.textInputs.length; i++ ) {
                    for( var j = 0; j < this.wordWin.totalWords( i ); j++ ) {
                        if(( i == text_idx && j >= idx ) || i > text_idx ) {
                            var origSpell = this.wordWin.originalSpellings[i][j];
                            if( origSpell == preReplSpell ) {
                                this.wordFlags[i][j] = undefined;
                            }
                        }
                    }
                }
                break;

            // replace: revert the word to its original spelling
            case this.replWordFlag :
                this._setWordText ( text_idx, idx, preReplSpell, undefined );
                break;
        }

        // For all four cases, clear the wordFlag of this word. re-start the process
        this.wordFlags[text_idx][idx] = undefined;
        this._spellcheck();
    }
}

function _spellcheck() {
    var ww = this.wordWin;

    // check if this is the last word in the current text element
    if( this.currentWordIndex == ww.totalWords( this.currentTextIndex) ) {
        this.currentTextIndex++;
        this.currentWordIndex = 0;
        // keep going if we're not yet past the last text element
        if( this.currentTextIndex < this.wordWin.textInputs.length ) {
            this._spellcheck();
            return;
        } else {
            this.terminateSpell();
            return;
        }
    }

    // if this is after the first one make sure the Undo button is enabled
    if( this.currentWordIndex > 0 ) {
        this.controlWin.enableUndo();
    }

    // skip the current word if it has already been worked on
    if( this.wordFlags[this.currentTextIndex][this.currentWordIndex] ) {
        // increment the global current word index and move on.
        this.currentWordIndex++;
        this._spellcheck();
    } else {
        var evalText = ww.getTextVal( this.currentTextIndex, this.currentWordIndex );
        if( evalText ) {
            this.controlWin.evaluatedText.value = evalText;
            ww.setFocus( this.currentTextIndex, this.currentWordIndex );
            this._getSuggestions( this.currentTextIndex, this.currentWordIndex );
        }
    }
}

function _getSuggestions( text_num, word_num ) {
    this.controlWin.clearSuggestions();
    // add suggestion in list for each suggested word.
    // get the array of suggested words out of the
    // three-dimensional array containing all suggestions.
    var a_suggests = this.wordWin.suggestions[text_num][word_num];
    if( a_suggests ) {
        // got an array of suggestions.
        for( var ii = 0; ii < a_suggests.length; ii++ ) {
            this.controlWin.addSuggestion( a_suggests[ii] );
        }
    }
    this.controlWin.selectDefaultSuggestion();
}

function _setAsIgnored( text_num, word_num, flag ) {
    // set the UI
    this.wordWin.removeFocus( text_num, word_num );
    // do the bookkeeping
    this.wordFlags[text_num][word_num] = flag;
    return true;
}

function _getTotalReplaced() {
    var i_replaced = 0;
    for( var i = 0; i < this.wordFlags.length; i++ ) {
        for( var j = 0; j < this.wordFlags[i].length; j++ ) {
            if(( this.wordFlags[i][j] == this.replWordFlag )
            || ( this.wordFlags[i][j] == this.replAllFlag )
            || ( this.wordFlags[i][j] == this.fromReplAll )) {
                i_replaced++;
            }
        }
    }
    return i_replaced;
}

function _setWordText( text_num, word_num, newText, flag ) {
    // set the UI and form inputs
    this.wordWin.setText( text_num, word_num, newText );
    // keep track of what happened to this word:
    this.wordFlags[text_num][word_num] = flag;
    return true;
}

function _getFormInputs( inputPattern ) {
    var inputs = new Array();
    for( var i = 0; i < document.forms.length; i++ ) {
        for( var j = 0; j < document.forms[i].elements.length; j++ ) {
            if( document.forms[i].elements[j].type.match( inputPattern )) {
                inputs[inputs.length] = document.forms[i].elements[j];
            }
        }
    }
    return inputs;
}
