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/**

* @file data.js

* @description Load and search movie showings from jsonShows/*.json

* @author G.E. Eidsness

* @version $Revision: 009 $

* $Date: 2013-09-16 12:01:39 -0700 (Mon, 16 Sept 2013) $

* @version $Revisions: 003 $

* $Date: 2023-11-17 00:46:39 -0700 (Fri, 17 Nov 2023) $

* $Date: 2024-09-29 10:06:39 -0700 (Mon, 29 Sept 2024) $

* @version $Rewrite: 001 $

* $Date: 2026-07-28 11:36:29 -0700 (Tue, 28 July 2026) $

/**

* @typedef {Object} Showing

* @property {Date|string} date

* @property {string} title

* @property {number} dur

* @property {string} descr

export const baseURL = "./jsonShows/";

/** @type {Object.<string, Object.<string, Showing>>} */

export let jsonShowings = { blank: {} };

/**

* @param {string|number} n

* @returns {string}

export const pad2 = (n) => String(n).padStart(2, "0");

/**

* @param {string|number} year

* @param {string|number} month1Based

* @returns {string}

export const monthJsonUrl = (year, month1Based) =>

`${baseURL}${year}_${pad2(month1Based)}.json`;

/**

* @param {string} jsonFile

* @returns {{ year: string, monthNum: number }}

const parseYearMonthFromUrl = (jsonFile) => {

const parts = jsonFile.split("/").pop().split(".")[0].split("_");

return { year: parts[0], monthNum: parseInt(parts[1], 10) };

};

/**

* @param {string|number} year

* @param {string|number} month1Based

* @returns {string}

const monthName = (year, month1Based) =>

new Date(year, month1Based - 1).toLocaleString("default", { month: "long" });

/**

* Convert showing date strings from JSON into Date objects (in place).

* @param {Object.<string, Object.<string, Showing>>} data

const adjustDateFormat = (data) => {

Object.values(data).forEach((day) => {

Object.values(day).forEach((showing) => {

if (showing && showing.date) {

showing.date = new Date(showing.date);

}

});

};

/**

* @param {Date} date

* @returns {Promise<boolean>}

export const isDataAvailable = async (date) => {

const url = monthJsonUrl(date.getFullYear(), date.getMonth() + 1);

try {

let response = await fetch(url, { method: "HEAD" });

// Some static hosts disallow HEAD; fall back to GET.

if (response.status === 405 || response.status === 501) {

response = await fetch(url, { method: "GET" });

}

return response.ok;

} catch {

return false;

}

};

/**

* @param {string|number} year

* @param {string|number} month1Based

* @returns {Promise<Date|null>}

export const findClosestAvailableDate = async (year, month1Based) => {

const currentDate = new Date(Number(year), Number(month1Based) - 1);

const futureDate = new Date(currentDate);

const pastDate = new Date(currentDate);

const maxAttempts = 12;

for (let i = 0; i < maxAttempts; i++) {

futureDate.setMonth(futureDate.getMonth() + 1);

if (await isDataAvailable(futureDate)) return futureDate;

pastDate.setMonth(pastDate.getMonth() - 1);

if (await isDataAvailable(pastDate)) return pastDate;

}

return null;

};

/**

* Load a month JSON file into jsonShowings.

* On 404, offers the closest available month (confirm dialog).

* @param {string} jsonFile

* @returns {Promise<{ ok: boolean, navigateTo: Date|null }>}

* navigateTo is set when the user accepts a fallback month (day 1).

export const loadShowings = async (jsonFile) => {

const { year, monthNum } = parseYearMonthFromUrl(jsonFile);

const label = `${monthName(year, monthNum)} ${year}`;

try {

const response = await fetch(jsonFile);

if (response.status === 404) {

const closestDate = await findClosestAvailableDate(year, monthNum);

if (closestDate) {

const closestLabel = `${closestDate.toLocaleString("default", {

month: "long",

})} ${closestDate.getFullYear()}`;

const userChoice = confirm(

`Data for ${label} is not available. Click OK to view ${closestLabel}.`

);

if (userChoice) {

const newJsonFile = monthJsonUrl(

closestDate.getFullYear(),

closestDate.getMonth() + 1

);

await loadShowings(newJsonFile);

return { ok: true, navigateTo: closestDate };

}

} else {

alert(`No available data found near ${label}.`);

}

jsonShowings = { blank: {} };

return { ok: false, navigateTo: null };

}

if (!response.ok) {

alert(`Error loading data for ${label}`);

console.error("HTTP error! status:", response.status);

jsonShowings = { blank: {} };

return { ok: false, navigateTo: null };

}

jsonShowings = await response.json();

adjustDateFormat(jsonShowings);

return { ok: true, navigateTo: null };

} catch (error) {

alert(`Error loading month data for ${label}`);

console.error("loadShowings() error:", error);

jsonShowings = { blank: {} };

return { ok: false, navigateTo: null };

}

};

/**

* Search a month JSON for title/description matches.

* @param {string} url

* @param {string} term

* @param {string} [searchType="title"] "title" | "descr"

* @returns {Promise<Array<{title: string, date: string}>>}

export const fetchAsyncListing = async (url, term, searchType = "title") => {

const matched = [];

const needle = term.toLowerCase();

if (!needle) return matched;

try {

const response = await fetch(url);

if (!response.ok) {

throw new Error(`HTTP error! status: ${response.status}`);

}

const data = await response.json();

for (const dateKey of Object.keys(data)) {

const listings = data[dateKey];

for (const listingKey of Object.keys(listings)) {

const item = listings[listingKey];

const field = (item[searchType] || "").toLowerCase();

if (field.includes(needle)) {

matched.push({

title: item.title,

date: item.date,

});

}

return matched;

} catch (error) {

console.error("fetchAsyncListing error:", error);

return [];

}

};