import { jsonError } from "../../../common.js";

export async function onRequestPost(context: RequestContext) {
  const { day, details, type } = context.data.body;
  const now = new Date();
  const currentMonth = now.getUTCMonth();
  const currentYear = now.getUTCFullYear();
  const lastDayOfMonth = new Date(currentYear, currentMonth, 0).getUTCDate();

  if (
    typeof day !== "number" ||
    day < 1 ||
    // Last day of that month
    day > lastDayOfMonth ||
    // Stop people sending weird decimal days
    parseInt(day.toString()) !== day ||
    typeof details !== "string" ||
    !details.length ||
    !["fotd", "gamenight", "rotw", "qotd"].includes(type) ||
    (type === "rotw" && !context.data.body.answer)
  )
    return jsonError("Invalid body", 400);

  if (
    await context.env.D1.prepare(
      "SELECT * FROM events WHERE day = ? AND month = ? AND type = ? AND year = ?;",
    )
      .bind(day, currentMonth, type, currentYear)
      .first()
  )
    return jsonError(
      "Event with that type already exists for the specified date",
      400,
    );

  if (type === "rotw") {
    const weekRanges: { [k: number]: number } = {
      0: 7,
      1: 14,
      2: 21,
      3: 28,
      4: 35,
    };

    const weekRange = Math.floor(day / 7);

    const existingEventInRange = await context.env.D1.prepare(
      "SELECT id FROM events WHERE day > ? AND day <= ? AND month = ? AND type = 'rotw' AND year = ?;",
    )
      .bind(
        weekRanges[weekRange] - 7,
        weekRanges[weekRange],
        currentMonth,
        currentYear,
      )
      .first();

    if (existingEventInRange)
      return jsonError("There is already an rotw for that week", 400);
  }

  const id = `${now.getTime()}${crypto.randomUUID().replaceAll("-", "")}`;

  await context.env.D1.prepare(
    "INSERT INTO events (answer, created_at, created_by, day, id, month, type, year) VALUES (?, ?, ?, ?, ?, ?, ?);",
  )
    .bind(
      context.data.body.answer || null,
      now.getTime(),
      context.data.current_user.id,
      day,
      id,
      currentMonth,
      type,
      currentYear,
    )
    .run();

  return new Response(null, {
    status: 204,
  });
}