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/*=:project

    scalable Inman Flash Replacement (sIFR) version 3.

  =:file

    Copyright: 2006 Mark Wubben.

    Author: Mark Wubben, <http://novemberborn.net/>

  =:history

    * IFR: Shaun Inman

    * sIFR 1: Mike Davidson, Shaun Inman and Tomas Jogin

    * sIFR 2: Mike Davidson, Shaun Inman, Tomas Jogin and Mark Wubben

  =:license

    This software is licensed and provided under the CC-GNU LGPL.

    See <http://creativecommons.org/licenses/LGPL/2.1/>    

*/

import SifrStyleSheet;

class sIFR {

  public static var DEFAULT_TEXT                 = 'Rendered with sIFR 3, revision 245';

  public static var CSS_ROOT_CLASS               = 'sIFR-root';

  public static var DEFAULT_WIDTH                = 300;

  public static var DEFAULT_HEIGHT               = 100;

  public static var DEFAULT_ANTI_ALIAS_TYPE      = 'advanced';

  public static var MARGIN_LEFT                  = -3;

  public static var PADDING_BOTTOM               = 5; // Extra padding to make sure the movie is high enough in most cases.

  public static var LEADING_REMAINDER            = 2; // Flash uses the specified leading minus 2 as the applied leading.

  public static var MAX_FONT_SIZE                = 126;

  public static var ALIASING_MAX_FONT_SIZE       = 48;

  //= Holds CSS properties and other rendering properties for the Flash movie.

  //  *Don't overwrite!*

  public static var styles:SifrStyleSheet        = new SifrStyleSheet();

  //= Allow sIFR to be run from localhost

  public static var fromLocal:Boolean            = true;

  //= Array containing domains for which sIFR may render text. Used to prevent

  //  hotlinking. Use `*` to allow all domains.

  public static var domains:Array                = [];

  //= Whether kerning is enabled by default. This can be overriden from the client side.

  //  See also <http://livedocs.macromedia.com/flash/8/main/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveDocs_Parts&file=00002811.html>.

  public static var defaultKerning:Boolean       = true;

  //= Default value which can be overriden from the client side.

  //  See also <http://livedocs.macromedia.com/flash/8/main/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveDocs_Parts&file=00002788.html>.

  public static var defaultSharpness:Number      = 0;

  //= Default value which can be overriden from the client side.

  //  See also <http://livedocs.macromedia.com/flash/8/main/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveDocs_Parts&file=00002787.html>.

  public static var defaultThickness:Number      = 0;

  //= Default value which can be overriden from the client side.

  //  See also <http://livedocs.macromedia.com/flash/8/main/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveDocs_Parts&file=00002732.html>.

  public static var defaultOpacity:Number        = -1; // Use client settings

  //= Default value which can be overriden from the client side.

  //  See also <http://livedocs.macromedia.com/flash/8/main/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveDocs_Parts&file=00002788.html>.

  public static var defaultBlendMode:Number      = -1; // Use cliest settings

  //= Overrides the grid fit type as defined on the client side.

  //  See also <http://livedocs.macromedia.com/flash/8/main/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveDocs_Parts&file=00002444.html>.

  public static var enforcedGridFitType:String   = null;

  //= If `true` sIFR won't override the anti aliasing set in the Flash IDE when exporting.

  //  Thickness and sharpness won't be affected either.

  public static var preserveAntiAlias:Boolean    = false;

  //= If `true` sIFR will disable anti-aliasing if the font size is larger than `ALIASING_MAX_FONT_SIZE`.

  //  This setting is *independent* from `preserveAntiAlias`.

  public static var conditionalAntiAlias:Boolean = true;

  //= Sets the anti alias type. By default it's `DEFAULT_ANTI_ALIAS_TYPE`.

  //  See also <http://livedocs.macromedia.com/flash/8/main/wwhelp/wwhimpl/common/html/wwhelp.htm?context=LiveDocs_Parts&file=00002733.html>.

  public static var antiAliasType:String         = null;

  //= Flash filters can be added to this array and will be applied to the text field.

  public static var filters:Array                = [];

  //= A mapping from the names of the filters to their actual objecs, used when transforming

  //  filters defined on the client. You can add additional filters here so they'll be supported

  //  when defined on the client.

  public static var filterMap:Object             = {

    DisplacementMapFilter : flash.filters.DisplacementMapFilter,

    ColorMatrixFilter     : flash.filters.ColorMatrixFilter,

    ConvolutionFilter     : flash.filters.ConvolutionFilter,

    GradientBevelFilter   : flash.filters.GradientBevelFilter,

    GradientGlowFilter    : flash.filters.GradientGlowFilter,

    BevelFilter           : flash.filters.BevelFilter,

    GlowFilter            : flash.filters.GlowFilter,

    BlurFilter            : flash.filters.BlurFilter,

    DropShadowFilter      : flash.filters.DropShadowFilter

  };

  private static var instance;

  private var textField;

  private var content;

  private var realHeight;

  private var originalHeight;

  private var currentHeight;

  private var fontSize;

  private var tuneWidth;

  private var tuneHeight;

  //= Sets the default styles for `sIFR.styles`. This method is called

  //  directly in `sifr.fla`, before options are applied.

  public static function setDefaultStyles() {

    sIFR.styles.parseCSS([

      '.', CSS_ROOT_CLASS, ' { color: #000000; }',

      'strong { display: inline; font-weight: bold; } ',

      'em { display: inline; font-style: italic; }',

      'a { color: #0000FF; text-decoration: underline; }',

      'a:hover { color: #0000FF; text-decoration: none; }'

    ].join(''));

  }

  //= Validates the domain sIFR is being used on.

  //  Returns `true` if the domain is valid, `false` otherwise.  

  public static function checkDomain():Boolean {

    if(sIFR.domains.length == 0) return true;

    var domain = (new LocalConnection()).domain();

    if(sIFR.fromLocal) sIFR.domains.push('localhost');

    for(var i = 0; i < sIFR.domains.length; i++) {

      var match = sIFR.domains[i];

      if(match == '*' || match == domain) return true;

      var wildcard = match.lastIndexOf('*');

      if(wildcard > -1) {

        match = match.substr(wildcard + 1);

        var matchPosition = domain.lastIndexOf(match);

        if(matchPosition > -1 && (matchPosition + match.length) == domain.length) return true;

      }

    }

    return false;

  }

  //= Runs sIFR. Called automatically.

  public static function run() {

    var holder  = _root.holder;

    var content = checkDomain() ? unescape(_root.content) : DEFAULT_TEXT

    if(content == 'undefined' || content == '') {

      content = DEFAULT_TEXT;

      fscommand('resetmovie', '');

    } else fscommand('ping', '');

    // Sets stage parameters

    Stage.scaleMode = 'noscale';

    Stage.align = 'TL';

    Stage.showMenu = false;

    // Other parameters

    var opacity = parseInt(_root.opacity);

    if(!isNaN(opacity)) holder._alpha = sIFR.defaultOpacity == -1 ? opacity : sIFR.defaultOpacity;

    else holder._alpha = 100;

    _root.blendMode = sIFR.defaultBlendMode == -1 ? _root.blendmode : sIFR.defaultBlendMode;

    sIFR.instance = new sIFR(holder.txtF, content);

    // This should ignore resizes from the callback. Disabled for now.

/*    if(_root.zoomsupport == 'true') Stage.addListener({onResize: function() { sIFR.instance.scale() }});*/

    // Setup callbacks

    _root.watch('callbackTrigger', function() { 

      sIFR.callback();

      return false;

    });

  }

  private static function eval(str) {

    var as;

    if(str.charAt(0) == '{') { // Ah, we need to create an object

      as = {};

      str = str.substring(1, str.length - 1);

      var $ = str.split(',');

      for(var i = 0; i < $.length; i++) {

        var $1 = $[i].split(':');

        as[$1[0]] = sIFR.eval($1[1]);

      }

    } else if(str.charAt(0) == '"') { // String

      as = str.substring(1, str.length - 1);

    } else if(str == 'true' || str == 'false') { // Boolean

      as = str == 'true';

    } else { // Float

      as = parseFloat(str);

    }

    return as;

  }

  private function applyFilters() {

    var $filters = this.textField.filters;

    $filters = $filters.concat(sIFR.filters);

    var $ = _root.flashfilters.split(';'); // name,prop:value,...;

    for(var i = 0; i < $.length; i++) {

      var $1 = $[i].split(',');

      var newFilter = new sIFR.filterMap[$1[0]]();

      for(var j = 1; j < $1.length; j++) {

        var $2 = $1[j].split(':');

        newFilter[$2[0]] = sIFR.eval(unescape($2[1]));

      }

      $filters.push(newFilter);

    }

    this.textField.filters = $filters;

  }

  private function sIFR(textField, content) {

    this.textField = textField;

    this.content   = content;

    var offsetLeft = parseInt(_root.offsetleft);

    textField._x = MARGIN_LEFT + (isNaN(offsetLeft) ? 0 : offsetLeft);

    var offsetTop = parseInt(_root.offsettop);

    if(!isNaN(offsetTop)) textField._y += offsetTop;

    tuneWidth = parseInt(_root.tunewidth);

    if(isNaN(tuneWidth)) tuneWidth = 0;

    tuneHeight = parseInt(_root.tuneheight);

    if(isNaN(tuneHeight)) tuneHeight = 0;

    textField._width = tuneWidth + (isNaN(parseInt(_root.width)) ? DEFAULT_WIDTH : parseInt(_root.width));

    textField._height = tuneHeight + (isNaN(parseInt(_root.height)) ? DEFAULT_HEIGHT : parseInt(_root.height));

    textField.wordWrap = true;

    textField.selectable = _root.selectable == 'true';

    textField.gridFitType = sIFR.enforcedGridFitType || _root.gridfittype;

    this.applyFilters();

    // Determine font-size and the number of lines

    this.fontSize = parseInt(_root.size);

    if(isNaN(this.fontSize)) this.fontSize = 26;

    styles.fontSize = this.fontSize;

    if(!sIFR.preserveAntiAlias && (sIFR.conditionalAntiAlias && this.fontSize < ALIASING_MAX_FONT_SIZE

    || !sIFR.conditionalAntiAlias)) {

      textField.antiAliasType = sIFR.antiAliasType || DEFAULT_ANTI_ALIAS_TYPE;      

    }

    if(!sIFR.preserveAntiAlias || !isNaN(parseInt(_root.sharpness))) {

      textField.sharpness = parseInt(_root.sharpness);

    }

    if(isNaN(textField.sharpness)) textField.sharpness = sIFR.defaultSharpness;

    if(!sIFR.preserveAntiAlias || !isNaN(parseInt(_root.thickness))) {

      textField.thickness = parseInt(_root.thickness);

    }

    if(isNaN(textField.thickness)) textField.thickness = sIFR.defaultThickness;

    // Set font-size and other styles

    sIFR.styles.parseCSS(unescape(_root.css));

    var rootStyle = styles.getStyle('.sIFR-root') || {};

    rootStyle.fontSize = this.fontSize; // won't go higher than 126!

    styles.setStyle('.sIFR-root', rootStyle);

    textField.styleSheet = styles;

    this.write(content);

    this.repaint();

  }

  private function repaint() {

    var leadingFix = this.isSingleLine() ? sIFR.styles.latestLeading : 0;

    if(leadingFix > 0) leadingFix -= LEADING_REMAINDER;

    // Flash wants to scroll the movie by one line, by adding the fontSize to the

    // textField height this is no longer happens. We also add the absolute tuneHeight,

    // to prevent a negative value from triggering the bug. We won't send the fake

    // value to the JavaScript side, though.

    textField._height = textField.textHeight + PADDING_BOTTOM + this.fontSize + Math.abs(tuneHeight) + tuneHeight - leadingFix;

    this.realHeight = textField._height - this.fontSize - Math.abs(tuneHeight);

    var arg = 'height:' + this.realHeight;

    if(_root.fitexactly == 'true') arg += ',width:' + (textField.textWidth + tuneWidth);

    fscommand('resize', arg);

    this.originalHeight = textField._height;

    this.currentHeight = Stage.height;

    textField._xscale = textField._yscale = parseInt(_root.zoom);

  }

  private function write(content) {

    this.textField.htmlText = ['<p class="', CSS_ROOT_CLASS, '">', 

                                content, '</p>'

                              ].join('');

  }

  private function isSingleLine() {

    return Math.round((this.textField.textHeight - sIFR.styles.latestLeading) / this.fontSize) == 1;

  }

  //= Scales the text field to the new scale of the Flash movie itself.

  public function scale() {

    this.currentHeight = Stage.height;

    var scale = 100 * Math.round(this.currentHeight / this.originalHeight);

    textField._xscale = textField._yscale = scale;

  }

  private function calculateRatios() {

    var strings = ['X', 'X<br>X', 'X<br>X<br>X', 'X<br>X<br>X<br>X'];

    var results = {};

    for(var i = 1; i <= strings.length; i++) {

      var size = 6;

      this.write(strings[i - 1]);

      while(size < MAX_FONT_SIZE) {

        var rootStyle = sIFR.styles.getStyle('.sIFR-root') || {};

        rootStyle.fontSize = size;

        sIFR.styles.setStyle('.sIFR-root', rootStyle);

        this.textField.styleSheet = sIFR.styles;

        this.repaint();

        var ratio = (this.realHeight - PADDING_BOTTOM) / i / size;

        if(!results[size]) results[size] = ratio;

        else results[size] = ((i - 1) * results[size] + ratio) / i;

        size++;

      }

    }

    var sizes = [], ratios = [];

    var ratiosToSizes = {}, sizesToRatios = {};

    for(var size in results) {

      if(results[size] == Object.prototype[size]) continue;

      var ratio = results[size];

      ratiosToSizes[ratio] = Math.max(ratio, parseInt(size));

    }

    for(var ratio in ratiosToSizes) {

      if(ratiosToSizes[ratio] == Object.prototype[ratio]) continue;

      sizesToRatios[ratiosToSizes[ratio]] = roundDecimals(ratio, 2);

      sizes.push(ratiosToSizes[ratio]);

    }

    sizes.sort(function(a, b) { return a - b; });

    for(var j = 0; j < sizes.length - 1; j++) ratios.push(sizes[j], sizesToRatios[sizes[j]]);

    ratios.push(sizesToRatios[sizes[sizes.length - 1]]);

    fscommand('debug:ratios', '[' + ratios.join(',') + ']');

  }

  private function roundDecimals(value, decimals) {

    return Math.round(value * Math.pow(10, decimals)) / Math.pow(10, decimals);

  }

  public static function callback() {

    switch(_root.callbackType) {

      case 'replacetext':

        sIFR.instance.content = _root.callbackValue;

        sIFR.instance.write(_root.callbackValue);

        sIFR.instance.repaint();

        break;

      case 'resettext':

        sIFR.instance.write('');

        sIFR.instance.write(sIFR.instance.content);

        break;

      case 'ratios':

        sIFR.instance.calculateRatios();

        break;

    }

  }

}