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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you 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.
*/

import * as graphic from '../../util/graphic';

var sin = Math.sin;
var cos = Math.cos;

export default graphic.extendShape({

    type: 'ec-ribbon',

    shape: {
        cx: 0,
        cy: 0,
        r: 0,
        s0: 0,
        s1: 0,
        t0: 0,
        t1: 0
    },

    style: {
        fill: '#000'
    },

    buildPath: function (ctx, shape) {

        var clockwise = shape.clockwise || false;

        var cx = shape.cx;
        var cy = shape.cy;
        var r = shape.r;
        var s0 = shape.s0;
        var s1 = shape.s1;
        var t0 = shape.t0;
        var t1 = shape.t1;
        var sx0 = cx + cos(s0) * r;
        var sy0 = cy + sin(s0) * r;
        var sx1 = cx + cos(s1) * r;
        var sy1 = cy + sin(s1) * r;
        var tx0 = cx + cos(t0) * r;
        var ty0 = cy + sin(t0) * r;
        var tx1 = cx + cos(t1) * r;
        var ty1 = cy + sin(t1) * r;

        ctx.moveTo(sx0, sy0);
        ctx.arc(cx, cy, shape.r, s0, s1, !clockwise);
        ctx.bezierCurveTo(
            (cx - sx1) * 0.70 + sx1,
            (cy - sy1) * 0.70 + sy1,
            (cx - tx0) * 0.70 + tx0,
            (cy - ty0) * 0.70 + ty0,
            tx0, ty0
        );
        // Chord to self
        if (shape.s0 === shape.t0 && shape.s1 === shape.t1) {
            return;
        }
        ctx.arc(cx, cy, shape.r, t0, t1, !clockwise);
        ctx.bezierCurveTo(
            (cx - tx1) * 0.70 + tx1,
            (cy - ty1) * 0.70 + ty1,
            (cx - sx0) * 0.70 + sx0,
            (cy - sy0) * 0.70 + sy0,
            sx0, sy0
        );
    }
});