/*
 * Copyright 2015 Open Networking Laboratory
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 ONOS GUI -- SVG -- Glyph Service
 */
(function () {
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    // injected references
    var $log, fs, sus;

    // internal state
    var glyphs = d3.map(),
        msgGS = 'GlyphService.';

    // ----------------------------------------------------------------------
    // Base set of Glyphs...

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            triangleUp: "M0.5,6.2c0,0,3.8-3.8,4.2-4.2C5,1.7,5.3,2,5.3,2l4.3," +
            "4.3c0,0,0.4,0.4-0.1,0.4c-1.7,0-8.2,0-8.8,0C0,6.6,0.5,6.2,0.5,6.2z",

            triangleDown: "M9.5,4.2c0,0-3.8,3.8-4.2,4.2c-0.3,0.3-0.5,0-0.5," +
            "0L0.5,4.2c0,0-0.4-0.4,0.1-0.4c1.7,0,8.2,0,8.8,0C10,3.8,9.5,4.2," +
            "9.5,4.2z"
        };

    // ----------------------------------------------------------------------

    function clear() {
        // start with a fresh map
        glyphs = d3.map();
    }

    function init() {
        clear();
        register(birdViewBox, birdData);
        register(glyphViewBox, glyphData);
        register(badgeViewBox, badgeData);
    }

    function register(viewBox, data, overwrite) {
        var dmap = d3.map(data),
            dups = [],
            ok;

        dmap.forEach(function (key, value) {
            if (!overwrite && glyphs.get(key)) {
                dups.push(key);
            } else {
                glyphs.set(key, {id: key, vb: viewBox, d: value});
            }
        });
        ok = (dups.length == 0);
        if (!ok) {
            dups.forEach(function (id) {
                $log.warn(msgGS + 'register(): ID collision: "'+id+'"');
            });
        }
        return ok;
    }

    function ids() {
        return glyphs.keys();
    }

    function glyph(id) {
        return glyphs.get(id);
    }

    // Note: defs should be a D3 selection of a single <defs> element
    function loadDefs(defs, glyphIds, noClear) {
        var list = fs.isA(glyphIds) || ids(),
            clearCache = !noClear;

        if (clearCache) {
            // remove all existing content
            defs.html(null);
        }

        // load up the requested glyphs
        list.forEach(function (id) {
            var g = glyph(id);
            if (g) {
                if (noClear) {
                    // quick exit if symbol is already present
                    if (defs.select('symbol#' + g.id).size() > 0) {
                        return;
                    }
                }
                defs.append('symbol')
                    .attr({ id: g.id, viewBox: g.vb })
                    .append('path').attr('d', g.d);
            }
        });
    }

    // trans can specify translation [x,y]
    function addGlyph(elem, glyphId, size, overlay, trans) {
        var sz = size || 40,
            ovr = !!overlay,
            xns = fs.isA(trans),
            atr = {
                width: sz,
                height: sz,
                'class': 'glyph',
                'xlink:href': '#' + glyphId
            };

        if (xns) {
            atr.transform = sus.translate(trans);
        }
        return elem.append('use').attr(atr).classed('overlay', ovr);
    }

    // ----------------------------------------------------------------------

    angular.module('onosSvg')
    .factory('GlyphService',
        ['$log', 'FnService', 'SvgUtilService',

        function (_$log_, _fs_, _sus_) {
            $log = _$log_;
            fs = _fs_;
            sus = _sus_;

            return {
                clear: clear,
                init: init,
                register: register,
                ids: ids,
                glyph: glyph,
                loadDefs: loadDefs,
                addGlyph: addGlyph
            };
        }]
    );

}());