RR0/rr0.org

import { LinkHandler } from '../LinkReplaceCommand';
import { Time } from './Time';
import { HtmlRR0SsgContext } from '../RR0SsgContext';
import { Link, LinkType } from 'ssg-api';

export class TimeLinkDefaultHandler implements LinkHandler<HtmlRR0SsgContext> {

  constructor(protected timeFiles: string[]) {
  }

  contents(context: HtmlRR0SsgContext): Link | undefined {
    const prevLink = this.prev(context);
    if (prevLink) {
      let contentUrl = prevLink.url.substring(1);
      do {
        const slash = contentUrl.lastIndexOf('/');
        contentUrl = contentUrl.substring(0, slash);
      } while (this.timeFiles.indexOf(contentUrl) < 0 && contentUrl !== 'time');
      if (contentUrl != 'time') {
        const text = Time.titleFromFile(context, contentUrl);
        if (text) {
          return {type: LinkType.prev, text, url: '/' + contentUrl};
        }
      }
    }
  }

  next(context: HtmlRR0SsgContext): Link | undefined {
    let fileName = context.inputFile.name;
    if (this.isTimeFile(fileName)) {
      const pos = this.timeFiles.indexOf(fileName);
      if (pos >= 0) {
        const nextFile = this.timeFiles[pos + 1];
        if (nextFile) {
          const text = Time.titleFromFile(context, nextFile)!;
          return {type: LinkType.next, text, url: '/' + nextFile};
        }
      }
    }
  }

  prev(context: HtmlRR0SsgContext): Link | undefined {
    let fileName = context.inputFile.name;
    if (this.isTimeFile(fileName)) {
      const pos = this.timeFiles.indexOf(fileName);
      if (pos >= 0) {
        const prevFile = this.timeFiles[pos - 1];
        if (prevFile) {
          const text = Time.titleFromFile(context, prevFile);
          if (text) {
            return {type: LinkType.prev, text, url: '/' + prevFile};
          }
        }
      }
    }
  }

  start(context: HtmlRR0SsgContext): Link | undefined {
    if (this.isTimeFile(context.inputFile.name)) {
      return {
        type: LinkType.contents,
        text: 'Chronologie',
        url: '/time/'
      };
    }
  }

  protected isTimeFile(fileName: string): boolean {
    return fileName.startsWith('time/');
  }
}