// Copyright (c) 2015 - 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
import { PathLayer } from '@deck.gl/layers';
const defaultProps = {
    fadeTrail: true,
    trailLength: { type: 'number', value: 120, min: 0 },
    currentTime: { type: 'number', value: 0, min: 0 },
    getTimestamps: { type: 'accessor', value: (d) => d.timestamps }
};
/** Render animated paths that represent vehicle trips. */
class TripsLayer extends PathLayer {
    getShaders() {
        const shaders = super.getShaders();
        shaders.inject = {
            'vs:#decl': `\
uniform float trailLength;
in float instanceTimestamps;
in float instanceNextTimestamps;
out float vTime;
`,
            // Timestamp of the vertex
            'vs:#main-end': `\
vTime = instanceTimestamps + (instanceNextTimestamps - instanceTimestamps) * vPathPosition.y / vPathLength;
`,
            'fs:#decl': `\
uniform bool fadeTrail;
uniform float trailLength;
uniform float currentTime;
in float vTime;
`,
            // Drop the segments outside of the time window
            'fs:#main-start': `\
if(vTime > currentTime || (fadeTrail && (vTime < currentTime - trailLength))) {
  discard;
}
`,
            // Fade the color (currentTime - 100%, end of trail - 0%)
            'fs:DECKGL_FILTER_COLOR': `\
if(fadeTrail) {
  color.a *= 1.0 - (currentTime - vTime) / trailLength;
}
`
        };
        return shaders;
    }
    initializeState() {
        super.initializeState();
        const attributeManager = this.getAttributeManager();
        attributeManager.addInstanced({
            timestamps: {
                size: 1,
                accessor: 'getTimestamps',
                shaderAttributes: {
                    instanceTimestamps: {
                        vertexOffset: 0
                    },
                    instanceNextTimestamps: {
                        vertexOffset: 1
                    }
                }
            }
        });
    }
    draw(params) {
        const { fadeTrail, trailLength, currentTime } = this.props;
        params.uniforms = {
            ...params.uniforms,
            fadeTrail,
            trailLength,
            currentTime
        };
        super.draw(params);
    }
}
TripsLayer.layerName = 'TripsLayer';
TripsLayer.defaultProps = defaultProps;
export default TripsLayer;