// Copyright 2020 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import { Group } from './ic-model.mjs';
import Processor from "./processor.mjs";
import { MapLogEvent } from "./log/map.mjs";
import { FocusEvent, SelectTimeEvent, SelectionEvent } from './events.mjs';
import { defineCustomElement, V8CustomElement } from './helper.mjs';

defineCustomElement('ic-panel', (templateText) =>
  class ICPanel extends V8CustomElement {
    #selectedLogEvents;
    #timeline;
    constructor() {
      super(templateText);
      this.initGroupKeySelect();
      this.groupKey.addEventListener(
        'change', e => this.updateTable(e));
      this.$('#filterICTimeBtn').addEventListener(
        'click', e => this.handleICTimeFilter(e));
    }
    set timeline(value) {
      console.assert(value !== undefined, "timeline undefined!");
      this.#timeline = value;
      this.selectedLogEvents = this.#timeline.all;
      this.updateCount();
    }
    get groupKey() {
      return this.$('#group-key');
    }

    get table() {
      return this.$('#table');
    }

    get tableBody() {
      return this.$('#table-body');
    }

    get count() {
      return this.$('#count');
    }

    get spanSelectAll() {
      return this.querySelectorAll("span");
    }

    set selectedLogEvents(value) {
      this.#selectedLogEvents = value;
      this.updateCount();
      this.updateTable();
    }

    updateCount() {
      this.count.innerHTML = this.selectedLogEvents.length;
    }

    get selectedLogEvents() {
      return this.#selectedLogEvents;
    }

    updateTable(event) {
      let select = this.groupKey;
      let key = select.options[select.selectedIndex].text;
      let tableBody = this.tableBody;
      this.removeAllChildren(tableBody);
      let groups = Group.groupBy(this.selectedLogEvents, key, true);
      this.render(groups, tableBody);
    }

    escapeHtml(unsafe) {
      if (!unsafe) return "";
      return unsafe.toString()
        .replace(/&/g, "&")
        .replace(/</g, "&lt;")
        .replace(/>/g, "&gt;")
        .replace(/"/g, "&quot;")
        .replace(/'/g, "&#039;");
    }
    processValue(unsafe) {
      if (!unsafe) return "";
      if (!unsafe.startsWith("http")) return this.escapeHtml(unsafe);
      let a = document.createElement("a");
      a.href = unsafe;
      a.textContent = unsafe;
      return a;
    }

    td(tr, content, className) {
      let node = document.createElement("td");
      if (typeof content == "object") {
        node.appendChild(content);
      } else {
        node.innerHTML = content;
      }
      node.className = className;
      tr.appendChild(node);
      return node
    }

    handleMapClick(e) {
      const entry = e.target.parentNode.entry;
      const id = entry.key;
      const selectedMapLogEvents =
        this.searchIcLogEventToMapLogEvent(id, entry.entries);
      this.dispatchEvent(new SelectionEvent(selectedMapLogEvents));
    }

    searchIcLogEventToMapLogEvent(id, icLogEvents) {
      // searches for mapLogEvents using the id, time
      const selectedMapLogEventsSet = new Set();
      for (const icLogEvent of icLogEvents) {
        const time = icLogEvent.time;
        const selectedMap = MapLogEvent.get(id, time);
        selectedMapLogEventsSet.add(selectedMap);
      }
      return Array.from(selectedMapLogEventsSet);
    }

    //TODO(zcankara) Handle in the processor for events with source positions.
    handleFilePositionClick(e) {
      const entry = e.target.parentNode.entry;
      this.dispatchEvent(new FocusEvent(entry.filePosition));
    }

    render(entries, parent) {
      let fragment = document.createDocumentFragment();
      let max = Math.min(1000, entries.length)
      for (let i = 0; i < max; i++) {
        let entry = entries[i];
        let tr = document.createElement("tr");
        tr.entry = entry;
        //TODO(zcankara) Create one bound method and use it everywhere
        if (entry.property === "map") {
          tr.addEventListener('click', e => this.handleMapClick(e));
          tr.classList.add('clickable');
        } else if (entry.property == "filePosition") {
          tr.classList.add('clickable');
          tr.addEventListener('click',
            e => this.handleFilePositionClick(e));
        }
        let details = this.td(tr, '<span>&#8505;</a>', 'details');
        //TODO(zcankara) don't keep the whole function context alive
        details.onclick = _ => this.toggleDetails(details);
        this.td(tr, entry.percentage + "%", 'percentage');
        this.td(tr, entry.count, 'count');
        this.td(tr, this.processValue(entry.key), 'key');
        fragment.appendChild(tr);
      }
      let omitted = entries.length - max;
      if (omitted > 0) {
        let tr = document.createElement("tr");
        let tdNode = this.td(tr, 'Omitted ' + omitted + " entries.");
        tdNode.colSpan = 4;
        fragment.appendChild(tr);
      }
      parent.appendChild(fragment);
    }


    renderDrilldown(entry, previousSibling) {
      let tr = document.createElement('tr');
      tr.className = "entry-details";
      tr.style.display = "none";
      // indent by one td.
      tr.appendChild(document.createElement("td"));
      let td = document.createElement("td");
      td.colSpan = 3;
      for (let key in entry.groups) {
        td.appendChild(this.renderDrilldownGroup(entry, key));
      }
      tr.appendChild(td);
      // Append the new TR after previousSibling.
      previousSibling.parentNode.insertBefore(tr, previousSibling.nextSibling)
    }

    renderDrilldownGroup(entry, key) {
      let max = 20;
      let group = entry.groups[key];
      let div = document.createElement("div")
      div.className = 'drilldown-group-title'
      div.textContent = key + ' [top ' + max + ' out of ' + group.length + ']';
      let table = document.createElement("table");
      this.render(group.slice(0, max), table, false)
      div.appendChild(table);
      return div;
    }

    toggleDetails(node) {
      let tr = node.parentNode;
      let entry = tr.entry;
      // Create subgroup in-place if the don't exist yet.
      if (entry.groups === undefined) {
        entry.createSubGroups();
        this.renderDrilldown(entry, tr);
      }
      let details = tr.nextSibling;
      let display = details.style.display;
      if (display != "none") {
        display = "none";
      } else {
        display = "table-row"
      };
      details.style.display = display;
    }

    initGroupKeySelect() {
      let select = this.groupKey;
      select.options.length = 0;
      for (let i in Processor.kProperties) {
        let option = document.createElement("option");
        option.text = Processor.kProperties[i];
        select.add(option);
      }
    }

    handleICTimeFilter(e) {
      this.dispatchEvent(new SelectTimeEvent(
        parseInt(this.$('#filter-time-start').value),
        parseInt(this.$('#filter-time-end').value)));
    }

  });