var system = require("system");
var fs = require("fs");

if (system.args.length !== 4) {
    console.log("Usage: generate-bbox.js svg_input_file bbox_output_file ");
    phantom.exit(1);
}

var address = system.args[1];
var output = system.args[2];
var metadata = system.args[3];

var content = JSON.parse(fs.read(metadata));
var glyphAnchors;
if (content.hasOwnProperty("glyphsWithAnchors")) {
    glyphAnchors = content["glyphsWithAnchors"];
}

var page = require("webpage").create();


function serialize(glyphAnchors) {

    var items = document.documentElement.getElementsByTagName("path");
    var bb = null;
    var getScreenBBoxImpl = null;
    var svgns = "http://www.w3.org/2000/svg";
    var unitsPerEm = document.documentElement.getElementsByTagName("font-face")[0].getAttribute("units-per-em");

    function getScreenBBox(e) {
        if (e.getScreenBBox) {
            return e.getScreenBBox();
        } else if (getScreenBBoxImpl) {
            return getScreenBBoxImpl(e);
        }
    }

    var impl = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
    impl += "<bounding-boxes ";
    impl += "font-family=\"" + document.documentElement.getAttribute("font-family") + "\" ";
    impl += "units-per-em=\"" + unitsPerEm + "\">\n";

    var i;
    for (i = 0; i < items.length; i++) {
        var item = items[i];
        impl += "\t<g c=\"" + item.getAttribute("id").toUpperCase() + "\" ";
        var r = item.getBBox();

        // add the bb value to the implementation
        impl += "x=\"" + r.x.toFixed(1) + "\" ";
        impl += "y=\"" + r.y.toFixed(1) + "\" ";
        impl += "w=\"" + r.width.toFixed(1) + "\" ";
        impl += "h=\"" + r.height.toFixed(1) + "\" ";
        if (item.getAttribute("horiz-adv-x")) {
            impl += "h-a-x=\"" + item.getAttribute("horiz-adv-x") + "\" ";
        }



        if (glyphAnchors) {
            var anchor = null;
            var testId = "uni" + item.getAttribute("id");
            var testName  = item.getAttribute("name");
            if (glyphAnchors.hasOwnProperty(testId)) {
                anchor = glyphAnchors[testId];
            }
            else if (glyphAnchors.hasOwnProperty(testName)) {
                anchor = glyphAnchors[testName];
            }
            if (anchor) {
                impl += ">";
                Object.keys(anchor).forEach(function(key) {
                    impl += "\n\t\t<a n=\"" + key + "\" x=\"" + anchor[key][0] + "\" y=\"" + anchor[key][1] + "\"/>";
                });
                impl += "\n\t</g>\n";
            }
            else {
              impl += "/>\n";
            }
        }
        else {
          impl += "/>\n";
        }
    }

    impl += "</bounding-boxes>\n";

    return impl;
}

function extract() {
    return function (status) {
        if (status !== "success") {
            console.log("Failed to open the page.");
        }
        else {
            var code = page.evaluate(serialize, glyphAnchors);
            //console.log(code);
            try {
                // We write the impl to the file...
                fs.write(output, code, "w");
            } catch(e) {
                console.log(e);
            }
            // ... and log the header
            //console.log(code[1]);
        }
        phantom.exit();
    };
}

page.open("file://" + fs.absolute(address), extract());