/*
 * SonarQube
 * Copyright (C) 2009-2022 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
import * as React from 'react';
import SourceViewer from '../../../components/SourceViewer/SourceViewer';
import { scrollToElement } from '../../../helpers/scrolling';
import { BranchLike } from '../../../types/branch-like';
import { Issue } from '../../../types/types';
import CrossComponentSourceViewer from '../crossComponentSourceViewer/CrossComponentSourceViewer';
import { getLocations, getSelectedLocation } from '../utils';

interface Props {
  branchLike: BranchLike | undefined;
  issues: Issue[];
  loadIssues: (component: string, from: number, to: number) => Promise<Issue[]>;
  locationsNavigator: boolean;
  onIssueChange: (issue: Issue) => void;
  onIssueSelect: (issueKey: string) => void;
  onLocationSelect: (index: number) => void;
  openIssue: Issue;
  selectedFlowIndex: number | undefined;
  selectedLocationIndex: number | undefined;
}

export default class IssuesSourceViewer extends React.PureComponent<Props> {
  node?: HTMLElement | null;

  componentDidUpdate(prevProps: Props) {
    const { openIssue, selectedLocationIndex } = this.props;

    // Scroll back to the issue when the selected location is set to -1
    const shouldScrollBackToIssue =
      selectedLocationIndex === -1 && selectedLocationIndex !== prevProps.selectedLocationIndex;
    if (
      prevProps.openIssue.component === openIssue.component &&
      (prevProps.openIssue !== openIssue || shouldScrollBackToIssue)
    ) {
      this.scrollToIssue();
    }
  }

  scrollToIssue = (smooth = true) => {
    if (this.node) {
      const element = this.node.querySelector(`[data-issue="${this.props.openIssue.key}"]`);
      if (element) {
        this.handleScroll(element, undefined, smooth);
      }
    }
  };

  handleScroll = (element: Element, offset = window.innerHeight / 2, smooth = true) => {
    scrollToElement(element, { topOffset: offset - 100, bottomOffset: offset, smooth });
  };

  handleLoaded = () => {
    this.scrollToIssue(false);
  };

  render() {
    const { openIssue, selectedFlowIndex, selectedLocationIndex } = this.props;

    const locations = getLocations(openIssue, selectedFlowIndex).map((loc, index) => {
      loc.index = index;
      return loc;
    });
    const selectedLocation = getSelectedLocation(
      openIssue,
      selectedFlowIndex,
      selectedLocationIndex
    );

    const highlightedLocationMessage =
      this.props.locationsNavigator && selectedLocationIndex !== undefined
        ? selectedLocation && { index: selectedLocationIndex, text: selectedLocation.msg }
        : undefined;

    const startLines = locations.map(l => l.textRange.startLine);
    const showCrossComponentSourceViewer =
      startLines.length > 0 ? Math.max(...startLines) !== Math.min(...startLines) : false;

    if (showCrossComponentSourceViewer) {
      return (
        <div ref={node => (this.node = node)}>
          <CrossComponentSourceViewer
            branchLike={this.props.branchLike}
            highlightedLocationMessage={highlightedLocationMessage}
            issue={openIssue}
            issues={this.props.issues}
            locations={locations}
            onIssueChange={this.props.onIssueChange}
            onLoaded={this.handleLoaded}
            onLocationSelect={this.props.onLocationSelect}
            scroll={this.handleScroll}
            selectedFlowIndex={selectedFlowIndex}
          />
        </div>
      );
    } else {
      // if location is selected, show (and load) code around it
      // otherwise show code around the open issue
      const aroundLine = selectedLocation
        ? selectedLocation.textRange.startLine
        : openIssue.textRange && openIssue.textRange.endLine;

      const component = selectedLocation ? selectedLocation.component : openIssue.component;
      const allMessagesEmpty =
        locations !== undefined && locations.every(location => !location.msg);

      const highlightedLocations = locations.filter(location => location.component === component);

      // do not load issues when open another file for a location
      const loadIssues =
        component === openIssue.component ? this.props.loadIssues : () => Promise.resolve([]);
      const selectedIssue = component === openIssue.component ? openIssue.key : undefined;

      return (
        <div ref={node => (this.node = node)}>
          <SourceViewer
            aroundLine={aroundLine}
            branchLike={this.props.branchLike}
            component={component}
            displayAllIssues={true}
            displayIssueLocationsCount={true}
            displayIssueLocationsLink={false}
            displayLocationMarkers={!allMessagesEmpty}
            highlightedLocationMessage={highlightedLocationMessage}
            highlightedLocations={highlightedLocations}
            loadIssues={loadIssues}
            onIssueChange={this.props.onIssueChange}
            onIssueSelect={this.props.onIssueSelect}
            onLoaded={this.handleLoaded}
            onLocationSelect={this.props.onLocationSelect}
            scroll={this.handleScroll}
            selectedIssue={selectedIssue}
            slimHeader={true}
          />
        </div>
      );
    }
  }
}