gatsby-node.ts

import TidalData from "./data/tides.json";
import path from "path";
import { TidesJson_PDFObject, TidesJson_ScheduleObject } from "./src/types";
import { BuildArgs, CreatePagesArgs } from "gatsby";
import fs from "fs";
import ical, { ICalEventBusyStatus, ICalEventClass } from "ical-generator";
import { DateTime } from "luxon";

export const createPages = async function ({
  actions,
  graphql,
}: CreatePagesArgs) {
  TidalData.pdfs.forEach((pdf: TidesJson_PDFObject) => {
    actions.createPage({
      path: "/tide-tables/" + pdf.url,
      component: path.resolve(`./src/components/templates/TideTablePage.tsx`),
      context: { pdf },
      defer: false,
    });
    actions.createRedirect({
      fromPath: "/tide-tables/" + pdf.url.replace("/", "-"),
      toPath: "/tide-tables/" + pdf.url,
    });
    actions.createRedirect({
      fromPath: "/tide-tables/" + pdf.url.replace("/", "-") + ".pdf",
      toPath: "/tide-tables/" + pdf.url + ".pdf",
    });
  });

  TidalData.schedule.forEach((day: TidesJson_ScheduleObject, index: number) => {
    actions.createPage({
      path: "/tide-graph/" + day.date,
      component: path.resolve(`./src/components/templates/TideGraphPage.tsx`),
      context: {
        day,
        nextDay:
          index < TidalData.schedule.length - 1
            ? TidalData.schedule[index + 1].date
            : false,
        previousDay: index > 0 ? TidalData.schedule[index - 1].date : false,
      },
      defer: false,
    });
  });

  // Legacy page
  actions.createRedirect({
    fromPath: "/historical-tables",
    toPath: "/tide-tables",
  });
};

export const onPostBootstrap = function ({ reporter }: BuildArgs) {
  reporter.info(`Generating iCal file for tide times`);
  const cal = ical();
  cal.timezone("Europe/London");
  cal.name("Porthmadog Tide Times");
  cal.description(
    "Tide times for Porthmadog, Borth-y-gest, Morfa Bychan and Black Rock Sands from Port-Tides.com"
  );
  const today = new Date();
  today.setHours(0, 0, 0, 0);
  const nextYear = new Date(today);
  nextYear.setDate(today.getDate() + 365);
  TidalData.schedule
    .filter((tideDay: TidesJson_ScheduleObject) => {
      let date = new Date(tideDay.date);
      return date >= today && date <= nextYear;
    })
    .forEach((day: TidesJson_ScheduleObject) =>
      day.groups.forEach((tide) => {
        cal.createEvent({
          start: DateTime.fromSQL(day.date + " " + tide.time).toJSDate(),
          end: DateTime.fromSQL(day.date + " " + tide.time)
            .plus({ minutes: 30 })
            .toJSDate(),
          summary: `High Tide Porthmadog - ${tide.height}m`,
          description: {
            plain: "Powered by port-tides.com",
            html: `More details at <a href="https://port-tides.com/">port-tides.com</a>`,
          },
          // Commented out to reduce file size
          /*location: {
            title: "Porthmadog",
            address: "Harbwr Porthmadog, LL49 9AY, UK",
          },
          busystatus: ICalEventBusyStatus.FREE,
          class: ICalEventClass.PUBLIC,
          url: "https://port-tides.com/tide-tables",*/
        });
      })
    );
  fs.writeFileSync("public/porthmadog-tides.ical", cal.toString());
  reporter.success(
    `Generated iCal file for tide times at public/porthmadog-tides.ical`
  );
};