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import { localDisc } from "./local-disc.js";
import { DiscLayout } from "../disc.js";
import { loadTapeFromData } from "../tapes.js";
import { toast } from "./toast.js";
import { errorText, reportIgnoredFiles, reportLoadFailure } from "./reporting.js";
import { MediaResolver, Schemas, openIfZip, routeOf, splitImage } from "../media-resolver.js";
import { MediaSlots } from "./media-slots.js";
import { noteFeature } from "./analytics.js";
import { failingFor, LoadFailures } from "../loader.js";
import { browserDiscNames, describeBrowserDisc, describeBuiltIn, describeSessionFile } from "./media-catalogue.js";
const isTapeName = (name) => /\.uef$/i.test(name);
const sameBytes = (a, b) => a.length === b.length && a.every((byte, i) => byte === b[i]);
/** The example discs that ship with jsbeeb. */
export const BuiltInImages = [
{
name: "Elite",
desc: "An 8-bit classic. Hit F10 to launch from the space station, then use <, >, S, X and A to fly around.",
file: "elite.ssd",
},
{
name: "Welcome",
desc: "The disc supplied with BBC Disc systems to demonstrate some of the features of the system.",
file: "Welcome.ssd",
},
{
name: "Music 5000",
desc: "The Music 5000 system disk and demo songs.",
file: "5000mstr36008.ssd",
},
];
/**
* Getting discs and tapes into the machine: resolving any image reference the
* URL schema can name, files from this computer, and what every source has to
* offer. What goes in a drive or the deck funnels through its `slots`.
*/
export class MediaLoader extends EventTarget {
/**
* @param {object} deps
* @param {Function} deps.isSnapshotFile says whether a dropped file is a save state
* @param {Function} deps.loadSnapshot restores a dropped save state
*/
constructor({ processor, model, drives, urlState, modals, isSnapshotFile, loadSnapshot }) {
super();
this.processor = processor;
this.model = model;
this.drives = drives;
this.urlState = urlState;
this.modals = modals;
this.resolver = new MediaResolver();
this.driveSource = null;
this.isSnapshotFile = isSnapshotFile;
this.loadSnapshot = loadSnapshot;
this.slots = new MediaSlots({ loader: this, drives, processor, urlState });
this.listers = new Map();
this.describers = new Map();
/** Files opened this session, by key: the only media the URL cannot name. */
this.sessionFiles = new Map();
this.nextSessionFileId = 1;
this.resolver.addSource("session", (key) => {
const file = this.sessionFiles.get(key);
if (!file) throw new Error(`${key} was not opened this session`);
return { name: file.name, data: file.data, ignored: [] };
});
this.addLister("builtin", () => BuiltInImages.map(describeBuiltIn));
this.addLister("browser", () => browserDiscNames().map(describeBrowserDisc));
this.addLister("session", () => {
const files = [...this.sessionFiles];
const alike = (file) => files.filter(([, other]) => other.name === file.name && other.kind === file.kind);
return files.map(([key, file]) => {
const sameName = alike(file);
const order = sameName.findIndex(([otherKey]) => otherKey === key) + 1;
return describeSessionFile(key, file.name, file.kind, { order, count: sameName.length });
});
});
document.getElementById("fs_load").addEventListener("change", async (evt) => {
Iif (evt.target.files.length === 0) return;
noteFeature(evt.target, "upload");
const file = evt.target.files[0];
try {
await this.loadSCSIFile(file);
} catch (error) {
reportLoadFailure(file.name, error);
}
evt.target.value = ""; // clear so if the user picks the same file again after a reset we get a "change"
});
}
get params() {
return this.urlState.params;
}
/** Register the fetcher behind an image schema; each source calls this as it is constructed. */
addSource(schema, fetcher) {
if (schema === "drive") this.driveSource = fetcher;
else this.resolver.addSource(schema, fetcher);
}
/**
* Register what a source has to offer the media window: a function returning
* descriptors (see media-catalogue.js), fetched when the window asks.
*/
addLister(source, lister) {
this.listers.set(source, lister);
}
/** How a source describes one entry by path; only a source whose descriptors carry a requirement needs one. */
addDescriber(source, describer) {
this.describers.set(source, describer);
}
/**
* The descriptor a reference's own source gives for it, whichever way the reference spells
* the schema, or null: for a source with no describer, a reference it does not know, or a
* source that cannot answer.
*/
async describe(ref) {
const { schema, image } = splitImage(ref);
const describer = this.describers.get(Schemas[schema]?.source);
if (!describer) return null;
try {
return (await describer(image)) ?? null;
} catch (error) {
console.error(`Describing ${ref} failed:`, error);
return null;
}
}
/**
* Everything every source offers, merged. A source that fails is reported
* and left out rather than taking the rest of the list with it.
*
* @returns {Promise<{descriptors: object[], failures: string[]}>}
*/
async listAll() {
const descriptors = [];
const failures = [];
const sources = [...this.listers.keys()];
const outcomes = await Promise.allSettled(sources.map(async (source) => this.listers.get(source)()));
outcomes.forEach((outcome, i) => {
if (outcome.status === "fulfilled") {
descriptors.push(...outcome.value);
} else {
console.error(`Listing ${sources[i]} failed:`, outcome.reason);
failures.push(`${sources[i]}: ${errorText(outcome.reason)}`);
}
});
return { descriptors, failures };
}
/**
* A file from this computer, into whatever it is for: a save state is
* restored, a tape goes in the deck, anything else into the named drive.
*
* @returns {Promise<?{kind: string, name: string, ref?: string, driveIndex?: number, words: string}>}
* what happened, with words for a toast; null when a restore failed and has been reported already
*/
async openFile(file, driveIndex = 0, entry) {
const arrayBuffer = await file.arrayBuffer();
if (this.isSnapshotFile(file.name, arrayBuffer)) {
if (!(await this.loadSnapshot(file, arrayBuffer))) return null;
return { kind: "snapshot", name: file.name, words: `Restored the state saved in ${file.name}.` };
}
// What a zip holds decides whether it is a tape or a disc, so it is opened first.
const { name, data, ignored } = await openIfZip(file.name, new Uint8Array(arrayBuffer));
reportIgnoredFiles(name, ignored);
if (isTapeName(name)) {
const ref = await this.loadTapeFile(name, data, entry);
return { kind: "tape", name, ref, words: `Loaded ${name} as the tape.` };
}
const ref = this.loadDiscFile(name, data, driveIndex, entry);
return { kind: "disc", name, ref, driveIndex, words: `Loaded ${name} into drive ${driveIndex}.` };
}
setAutoboot(on) {
this.urlState.set({ autoboot: on ? true : undefined });
}
/**
* Keeps a file opened this session for the list, and says so with "files-changed".
* A file with the same name and bytes as one already kept is that one again.
*
* @returns {string} the `session:` reference the file is known by
*/
rememberFile(name, data, kind) {
for (const [key, file] of this.sessionFiles) {
if (file.name === name && file.kind === kind && sameBytes(file.data, data)) return `session:${key}`;
}
const key = `${this.nextSessionFileId++}/${name}`;
this.sessionFiles.set(key, { name, data, kind });
this.dispatchEvent(new Event("files-changed"));
return `session:${key}`;
}
/** A disc image from this computer, into a drive; the URL cannot name it, so it is unnamed there. */
loadDiscFile(name, data, driveIndex, entry) {
const loadedDisc = disc.discFor(name, data, undefined, this.drives.layoutForDrive(driveIndex));
// Local file: retain the image bytes for embedding in save-to-file snapshots.
loadedDisc.setOriginalImage(data);
const ref = this.rememberFile(name, data, "disc");
this.slots.put(this.slots.drive(driveIndex), loadedDisc, ref, { inUrl: false, entry });
return ref;
}
/** A tape image from this computer, into the deck; likewise unnamed in the URL. */
async loadTapeFile(name, data, entry) {
const tape = await loadTapeFromData(name, data, this.model);
const ref = this.rememberFile(name, data, "tape");
this.slots.put(this.slots.deck, tape, ref, { inUrl: false, entry });
return ref;
}
async loadSCSIFile(file) {
const { processor } = this;
if (!processor.filestore) return;
processor.filestore.scsi = new Uint8Array(await file.arrayBuffer());
processor.filestore.PC = 0x400;
processor.filestore.SP = 0xff;
processor.filestore.A = 1;
processor.filestore.emulationSpeed = 0;
// Reset any open receive blocks
processor.econet.receiveBlocks = [];
processor.econet.nextReceiveBlockNumber = 1;
this.modals.hide("econetfs");
}
async loadDiscImage(discImage, layout = DiscLayout.auto) {
if (!discImage) return null;
const { image } = splitImage(discImage);
const route = routeOf(discImage);
if (route === "browser") {
return localDisc(image, layout, (error) =>
toast(
`Browser storage would not take changes to ${image} (${errorText(error)}). Use the drive's Save button to keep a copy.`,
{ title: "Disc", quietKey: "quietLocalDiscSaveFailed" },
),
);
}
if (route === "drive") {
const [, id, name = "(unknown)"] = image.match(/([^/]+)\/?(.*)/) ?? [null, image];
return this.driveSource({ name, id }, layout);
}
// TODO(#822) come up with a decent UX for passing an 'onChange' parameter to each of these.
// Consider:
// * hashing contents and making a local disc image named by original disc hash, save by that, and offer
// to load the modified disc on load.
// * popping up a message that notes the disc has changed, and offers a way to make a local image
// * Dialog box (ugh) saying "is this ok?"
const { name, data, ignored } = await this.resolver.resolve("disc", discImage);
reportIgnoredFiles(name, ignored);
const loaded = await failingFor(LoadFailures.badImage, () => disc.discFor(name, data, undefined, layout));
if (route === "session") loaded.setOriginalImage(data);
return loaded;
}
async loadTapeImage(tapeImage) {
if (!tapeImage) return null;
const { name, data, ignored } = await this.resolver.resolve("tape", tapeImage);
reportIgnoredFiles(name, ignored);
return failingFor(LoadFailures.badImage, () => loadTapeFromData(name, data, this.model));
}
}
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