/**
* @license
* Copyright (C) 2017-2018 "IoT.bzh"
* Author Sebastien Douheret <sebastien@iot.bzh>
*
* 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.
*/

import { Component, OnInit, AfterViewInit, ViewEncapsulation } from '@angular/core';
import { Injectable, Inject } from '@angular/core';
import { DOCUMENT } from '@angular/common';
import * as d3 from 'd3';

import { SupervisionService, AglTopology } from '../../@core-xds/services/supervision.service';
import { AlertService } from '../../@core-xds/services/alert.service';

interface WsCheckbox {
  name: string;
  pid: number;
  value: boolean;
  disabled: boolean;
  tooltip: string;
}

@Component({
  selector: 'xds-supervision',
  styleUrls: ['./supervision-config.component.scss'],
  templateUrl: './supervision-config.component.html',
  encapsulation: ViewEncapsulation.None,  // workaround about https://github.com/angular/angular/issues/7845
})
export class SupervisionConfigComponent implements OnInit, AfterViewInit {

  daemonCheckboxes: WsCheckbox[] = [];
  starting = false;
  stopping = false;

  private graph: any;
  private svg: any;
  private links = [];

  constructor(@Inject(DOCUMENT) private document: Document,
    private supervisorSvr: SupervisionService,
    private alert: AlertService,
  ) {

  }

  ngOnInit() {

  }

  ngAfterViewInit() {
    this.getAGLTopo();
  }

  getAGLTopo() {
    this.supervisorSvr.getTopo().subscribe(topo => {
      this.graphAGLBindings(topo);
      this.updateCheckboxes(topo);
    });
  }

  onStartTrace() {
    this.starting = true;

    const dmArr = [];
    this.daemonCheckboxes.forEach(dm => dm.value && dmArr.push(dm.pid));

    this.supervisorSvr.startTrace({ pids: dmArr }).subscribe(res => {
      this.starting = false;
      this.alert.info('Monitoring successfully started');
    }, err => {
      this.starting = false;
      this.alert.error(err);
    });
  }

  onStopTrace() {
    this.stopping = true;
    this.supervisorSvr.stopTrace({}).subscribe(res => {
      this.stopping = false;
      this.alert.info('Monitoring successfully stopped');
    }, err => {
      this.stopping = false;
      this.alert.error(err);
    });
  }

  isStartBtnDisable(): boolean {
    return this.starting;
  }

  isStopBtnDisable(): boolean {
    return this.stopping;
  }

  private updateCheckboxes(topo: AglTopology[]) {
    this.daemonCheckboxes = [];
    topo.forEach(elem => {
      this.daemonCheckboxes.push({
        name: elem.name,
        pid: elem.pid,
        value: false,
        disabled: false,
        tooltip: 'Daemon ' + elem.name + ' (pid ' + elem.pid + ')',
      });
    });

  }


  // Compute the distinct nodes from the links.
  // Based on http://bl.ocks.org/mbostock/1153292
  private graphAGLBindings(topo: AglTopology[]) {

    const ws_link: { [id: string]: string[] } = {};
    let ii = 1;
    topo.forEach(elem => {
      if (elem.name === 'null') {
        elem.name = 'Daemon-' + String(ii++);
      }
      if (elem.ws_clients && elem.ws_clients instanceof Array) {
        elem.ws_clients.forEach((ws: string) => {
          if (ws_link[ws]) {
            ws_link[ws].push(elem.name);
          } else {
            ws_link[ws] = [elem.name];
          }
        });
      }
      if (elem.ws_servers && elem.ws_servers instanceof Array) {
        elem.ws_servers.forEach((ws: string) => {
          if (ws_link[ws]) {
            ws_link[ws].push(elem.name);
          } else {
            ws_link[ws] = [elem.name];
          }
        });
      }
    });

    const nodes = {};
    this.links = [];
    ii = 1;
    topo.forEach(elem => {
      let almostOne = false;
      if (elem.ws_clients && elem.ws_clients.length) {
        elem.ws_clients.forEach(wsCli => {
          ws_link[wsCli].forEach(appName => {
            if (appName !== elem.name) {
              almostOne = true;
              this.links.push({ source: elem.name, target: appName, type: 'ws-client' });
            }
          });
        });
      }
      if (elem.ws_servers && elem.ws_servers.length) {
        elem.ws_servers.forEach(wsSvr => {
          ws_link[wsSvr].forEach(appName => {
            if (appName !== elem.name) {
              almostOne = true;
              this.links.push({ source: elem.name, target: appName, type: 'ws-server' });
            }
          });
        });
      }
      if (!almostOne) {
        const name = '???-' + String(ii++);
        this.links.push({
          source: elem.isServer ? name : elem.name,
          target: elem.isServer ? elem.name : name,
          type: 'not-connected',
        });
      }
    });

    this.links.forEach(function (link) {
      link.source = nodes[link.source] || (nodes[link.source] = {
        name: link.source,
      });
      link.target = nodes[link.target] || (nodes[link.target] = {
        name: link.target,
      });
    });

    const width = this.document.getElementById('graph').clientWidth,
      height = this.document.getElementById('graph').clientHeight;

    // Delete previous graph
    if (this.svg) {
      this.svg.remove();
    }

    // Create new graph
    const force = d3.layout.force()
      .nodes(d3.values(nodes))
      .links(this.links)
      .size([width, height])
      .linkDistance(120)
      .charge(-600)
      .on('tick', tick)
      .start();
    // const force = d3.forceSimulation()

    this.graph = d3.select('#graph');
    this.svg = this.graph.append('svg')
      .attr('width', width)
      .attr('height', height);

    // Define the div for the tooltip
    /*
    const divTooltip = d3.select('#graph').append('div')
      .attr('class', 'tooltip')
      .style('opacity', 0);
    */

    // Per-type markers, as they don't inherit styles.
    this.svg.append('defs').selectAll('marker')
      .data(['ws-server', 'ws-client', 'not-connected'])
      .enter().append('marker')
      .attr('id', function (d) {
        return d;
      })
      .attr('viewBox', '0 -5 10 10')
      .attr('refX', 15)
      .attr('refY', -1.5)
      .attr('markerWidth', 12)
      .attr('markerHeight', 12)
      .attr('orient', 'auto')
      .append('path')
      .attr('d', 'M0,-5L10,0L0,5');

    const path = this.svg.append('g').selectAll('path')
      .data(force.links())
      .enter().append('path')
      .attr('class', function (d) {
        return 'link ' + d.type;
      })
      .attr('marker-end', function (d) {
        return 'url(#' + d.type + ')';
      });

    const circle = this.svg.append('g').selectAll('circle')
      .data(force.nodes())
      .enter().append('circle')
      .attr('r', 12)
      .call(force.drag);

    const text = this.svg.append('g').selectAll('text')
      .data(force.nodes())
      .enter().append('text')
      .attr('x', 20)
      .attr('y', '.31em')
      .text(function (d) {
        return d.name;
      });

    /* TODO - SEB
        circle.on('mouseover', d => {
          divTooltip.transition()
            .duration(200)
            .style('opacity', .9);
            divTooltip.html('This is a Tooltip <br/>' + d.close)
            .style('left', (d3.event.pageX) + 'px')
            .style('top', (d3.event.pageY - 28) + 'px');
        });

        //  Tooltip Object
        const tooltip = d3.select('body')
          .append('div').attr('id', 'tooltip')
          .style('position', 'absolute')
          .style('z-index', '10')
          .style('visibility', 'hidden')
          .text('a simple tooltip');
    */

    // Use elliptical arc path segments to doubly-encode directionally.
    function tick() {
      path.attr('d', linkArc);
      circle.attr('transform', transform);
      text.attr('transform', transform);
    }

    function linkArc(d) {
      const dx = d.target.x - d.source.x,
        dy = d.target.y - d.source.y,
        dr = Math.sqrt(dx * dx + dy * dy);
      return 'M' + d.source.x + ',' + d.source.y + 'A' + dr + ',' + dr + ' 0 0,1 ' + d.target.x + ',' + d.target.y;
    }

    function transform(d) {
      return 'translate(' + d.x + ',' + d.y + ')';
    }
  }
}