gb = new GnuBook();

gb.titleLeaf = 9;

gb.getPageWidth = function(index) {
    return this.pageW[index];
}

gb.getPageHeight = function(index) {
    return this.pageH[index];
}

// Returns true if page image is available rotated
gb.canRotatePage = function(index) {
    return 'jp2' == this.imageFormat; // Assume single format for now
}

// reduce defaults to 1 (no reduction)
// rotate defaults to 0 (no rotation)
gb.getPageURI = function(index, reduce, rotate) {
    var _reduce;
    var _rotate;

    if ('undefined' == typeof(reduce)) {
        _reduce = 1;
    } else {
        _reduce = reduce;
    }
    if ('undefined' == typeof(rotate)) {
        _rotate = 0;
    } else {
        _rotate = rotate;
    }
    
    var file = this._getPageFile(index);
        
    // $$$ add more image stack formats here
    if (1==this.mode) {
        var url = 'http://'+this.server+'/GnuBook/GnuBookImages.php?zip='+this.zip+'&file='+file+'&scale='+_reduce+'&rotate='+_rotate;
    } else {
        if ('undefined' == typeof(reduce)) {
            // reduce not passed in
            var ratio = this.getPageHeight(index) / this.twoPage.height;
            var scale;
            // $$$ we make an assumption here that the scales are available pow2 (like kakadu)
            if (ratio < 2) {
                scale = 1;
            } else if (ratio < 4) {
                scale = 2;
            } else if (ratio < 8) {
                scale = 4;
            } else if (ratio < 16) {
                scale = 8;
            } else  if (ratio < 32) {
                scale = 16;
            } else {
                scale = 32;
            }
            _reduce = scale;
        }
    
        var url = 'http://'+this.server+'/GnuBook/GnuBookImages.php?zip='+this.zip+'&file='+file+'&scale='+_reduce+'&rotate='+_rotate;
        
    }
    return url;
}

gb._getPageFile = function(index) {
    var leafStr = '0000';
    var imgStr = this.leafMap[index].toString();
    var re = new RegExp("0{"+imgStr.length+"}$");
    
    var insideZipPrefix = this.subPrefix.match('[^/]+$');
    var file = insideZipPrefix + '_' + this.imageFormat + '/' + insideZipPrefix + '_' + leafStr.replace(re, imgStr) + '.' + this.imageFormat;
    
    return file;
}

gb.getPageSide = function(index) {
    //assume the book starts with a cover (right-hand leaf)
    //we should really get handside from scandata.xml
    
        
    // $$$ we should get this from scandata instead of assuming the accessible
    //     leafs are contiguous
    if ('rl' != this.pageProgression) {
        // If pageProgression is not set RTL we assume it is LTR
        if (0 == (index & 0x1)) {
            // Even-numbered page
            return 'R';
        } else {
            // Odd-numbered page
            return 'L';
        }
    } else {
        // RTL
        if (0 == (index & 0x1)) {
            return 'L';
        } else {
            return 'R';
        }
    }
}

gb.getPageNum = function(index) {
    var pageNum = this.pageNums[index];
    if (pageNum) {
        return pageNum;
    } else {
        return 'n' + index;
    }
}

gb.leafNumToIndex = function(leafNum) {
    var index = jQuery.inArray(leafNum, this.leafMap);
    if (-1 == index) {
        return null;
    } else {
        return index;
    }
}

// This function returns the left and right indices for the user-visible
// spread that contains the given index.  The return values may be
// null if there is no facing page or the index is invalid.
gb.getSpreadIndices = function(pindex) {
    // $$$ we could make a separate function for the RTL case and
    //      only bind it if necessary instead of always checking
    // $$$ we currently assume there are no gaps
    
    var spreadIndices = [null, null]; 
    if ('rl' == this.pageProgression) {
        // Right to Left
        if (this.getPageSide(pindex) == 'R') {
            spreadIndices[1] = pindex;
            spreadIndices[0] = pindex + 1;
        } else {
            // Given index was LHS
            spreadIndices[0] = pindex;
            spreadIndices[1] = pindex - 1;
        }
    } else {
        // Left to right
        if (this.getPageSide(pindex) == 'L') {
            spreadIndices[0] = pindex;
            spreadIndices[1] = pindex + 1;
        } else {
            // Given index was RHS
            spreadIndices[1] = pindex;
            spreadIndices[0] = pindex - 1;
        }
    }
    
    //console.log("   index %d mapped to spread %d,%d", pindex, spreadIndices[0], spreadIndices[1]);
    
    return spreadIndices;
}

// Remove the page number assertions for all but the highest index page with
// a given assertion.  Ensures there is only a single page "{pagenum}"
// e.g. the last page asserted as page 5 retains that assertion.
gb.uniquifyPageNums = function() {
    var seen = {};
    
    for (var i = gb.pageNums.length - 1; i--; i >= 0) {
        var pageNum = gb.pageNums[i];
        if ( !seen[pageNum] ) {
            seen[pageNum] = true;
        } else {
            gb.pageNums[i] = null;
        }
    }

}

gb.cleanupMetadata = function() {
    gb.uniquifyPageNums();
}

// getEmbedURL
//________
// Returns a URL for an embedded version of the current book
gb.getEmbedURL = function() {
    // We could generate a URL hash fragment here but for now we just leave at defaults
    var url = 'http://' + window.location.host + '/stream/'+this.bookId;
    if (this.subPrefix != this.bookId) { // Only include if needed
        url += '/' + this.subPrefix;
    }
    url += '?ui=embed';
    return url;
}

// getEmbedCode
//________
// Returns the embed code HTML fragment suitable for copy and paste
gb.getEmbedCode = function() {
    return "<iframe src='" + this.getEmbedURL() + "' width='480px' height='430px'></iframe>";
}

gb.pageW =		[
            2416,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2256,2416            ];

gb.pageH =		[
            3563,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3354,3584            ];
gb.leafMap = [
            1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112    
            ];

gb.pageNums = [
            null,null,null,null,null,null,null,null,null,null,null,null,null,'6','7','8','9','10','11','12','13','14','15','16','17','18','19','20','21','22','23','24','25','26','27','28','29','30','31','32','33','34','35','36','37','38','39','40','41','42','43','44','45','46','47','48','49','50','51','52','53','54','55','56','57','58','59','60','61','62','63','64','65','66','67','68','69','70','71','72','73','74','75','76','77','78','79','80','81','82','83','84','85','86','87','88','89','90','91','92','93','94','95',null,null,null,null,null,null,null,null,null    
            ];
            
      
gb.numLeafs = gb.pageW.length;

gb.bookId   = 'essaysirishameri00yeat';
gb.zip      = '/2/items/essaysirishameri00yeat/essaysirishameri00yeat_jp2.zip';
gb.subPrefix = '';
gb.server   = 'ia301503.us.archive.org';
gb.bookTitle= 'Essays, Irish and American.';
gb.bookPath = '/2/items/essaysirishameri00yeat/essaysirishameri00yeat';
gb.bookUrl  = 'http://www.archive.org/details/essaysirishameri00yeat';
gb.imageFormat = 'jp2';

gb.pageProgression = 'lr';
// Check for config object
// $$$ change this to use the newer params object
if (typeof(gbConfig) != 'undefined') {
    if (typeof(gbConfig["ui"]) != 'undefined') {
        gb.ui = gbConfig["ui"];
    }

    if (gbConfig['mode'] == 1) {
        gb.mode = 1;
        if (typeof(gbConfig['reduce'] != 'undefined')) {
            gb.reduce = gbConfig['reduce'];
        }
    } else if (gbConfig['mode'] == 2) {
        gb.mode = 2;
      
    }
} // gbConfig

gb.cleanupMetadata();
gb.init();