/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
import { createTrustedTypesPolicy } from './trustedTypes.js';
import { onUnexpectedError } from '../common/errors.js';
import { logOnceWebWorkerWarning } from '../common/worker/simpleWorker.js';
import { Disposable, toDisposable } from '../common/lifecycle.js';
// Reuse the trusted types policy defined from worker bootstrap
// when available.
// Refs https://github.com/microsoft/vscode/issues/222193
let ttPolicy;
if (typeof self === 'object' && self.constructor && self.constructor.name === 'DedicatedWorkerGlobalScope' && globalThis.workerttPolicy !== undefined) {
    ttPolicy = globalThis.workerttPolicy;
}
else {
    ttPolicy = createTrustedTypesPolicy('defaultWorkerFactory', { createScriptURL: value => value });
}
function getWorker(label) {
    const monacoEnvironment = globalThis.MonacoEnvironment;
    if (monacoEnvironment) {
        if (typeof monacoEnvironment.getWorker === 'function') {
            return monacoEnvironment.getWorker('workerMain.js', label);
        }
        if (typeof monacoEnvironment.getWorkerUrl === 'function') {
            const workerUrl = monacoEnvironment.getWorkerUrl('workerMain.js', label);
            return new Worker(ttPolicy ? ttPolicy.createScriptURL(workerUrl) : workerUrl, { name: label });
        }
    }
    // ESM-comment-begin
    // 	if (typeof require === 'function') {
    // 		// check if the JS lives on a different origin
    // 		const workerMain = require.toUrl('vs/base/worker/workerMain.js'); // explicitly using require.toUrl(), see https://github.com/microsoft/vscode/issues/107440#issuecomment-698982321
    // 		const workerUrl = getWorkerBootstrapUrl(workerMain, label);
    // 		return new Worker(ttPolicy ? ttPolicy.createScriptURL(workerUrl) as unknown as string : workerUrl, { name: label });
    // 	}
    // ESM-comment-end
    throw new Error(`You must define a function MonacoEnvironment.getWorkerUrl or MonacoEnvironment.getWorker`);
}
// ESM-comment-begin
// export function getWorkerBootstrapUrl(scriptPath: string, label: string): string {
// 	if (/^((http:)|(https:)|(file:))/.test(scriptPath) && scriptPath.substring(0, globalThis.origin.length) !== globalThis.origin) {
// 		// this is the cross-origin case
// 		// i.e. the webpage is running at a different origin than where the scripts are loaded from
// 	} else {
// 		const start = scriptPath.lastIndexOf('?');
// 		const end = scriptPath.lastIndexOf('#', start);
// 		const params = start > 0
// 			? new URLSearchParams(scriptPath.substring(start + 1, ~end ? end : undefined))
// 			: new URLSearchParams();
// 
// 		COI.addSearchParam(params, true, true);
// 		const search = params.toString();
// 		if (!search) {
// 			scriptPath = `${scriptPath}#${label}`;
// 		} else {
// 			scriptPath = `${scriptPath}?${params.toString()}#${label}`;
// 		}
// 	}
// 
// 	const factoryModuleId = 'vs/base/worker/defaultWorkerFactory.js';
// 	const workerBaseUrl = require.toUrl(factoryModuleId).slice(0, -factoryModuleId.length); // explicitly using require.toUrl(), see https://github.com/microsoft/vscode/issues/107440#issuecomment-698982321
// 	const blob = new Blob([[
// 		`/*${label}*/`,
// 		`globalThis.MonacoEnvironment = { baseUrl: '${workerBaseUrl}' };`,
// 		`globalThis._VSCODE_NLS_MESSAGES = ${JSON.stringify(globalThis._VSCODE_NLS_MESSAGES)};`,
// 		`globalThis._VSCODE_NLS_LANGUAGE = ${JSON.stringify(globalThis._VSCODE_NLS_LANGUAGE)};`,
// 		`const ttPolicy = globalThis.trustedTypes?.createPolicy('defaultWorkerFactory', { createScriptURL: value => value });`,
// 		`globalThis.workerttPolicy = ttPolicy;`,
// 		`importScripts(ttPolicy?.createScriptURL('${scriptPath}') ?? '${scriptPath}');`,
// 		`/*${label}*/`
// 	].join('')], { type: 'application/javascript' });
// 	return URL.createObjectURL(blob);
// }
// ESM-comment-end
function isPromiseLike(obj) {
    if (typeof obj.then === 'function') {
        return true;
    }
    return false;
}
/**
 * A worker that uses HTML5 web workers so that is has
 * its own global scope and its own thread.
 */
class WebWorker extends Disposable {
    constructor(moduleId, id, label, onMessageCallback, onErrorCallback) {
        super();
        this.id = id;
        this.label = label;
        const workerOrPromise = getWorker(label);
        if (isPromiseLike(workerOrPromise)) {
            this.worker = workerOrPromise;
        }
        else {
            this.worker = Promise.resolve(workerOrPromise);
        }
        this.postMessage(moduleId, []);
        this.worker.then((w) => {
            w.onmessage = function (ev) {
                onMessageCallback(ev.data);
            };
            w.onmessageerror = onErrorCallback;
            if (typeof w.addEventListener === 'function') {
                w.addEventListener('error', onErrorCallback);
            }
        });
        this._register(toDisposable(() => {
            this.worker?.then(w => {
                w.onmessage = null;
                w.onmessageerror = null;
                w.removeEventListener('error', onErrorCallback);
                w.terminate();
            });
            this.worker = null;
        }));
    }
    getId() {
        return this.id;
    }
    postMessage(message, transfer) {
        this.worker?.then(w => {
            try {
                w.postMessage(message, transfer);
            }
            catch (err) {
                onUnexpectedError(err);
                onUnexpectedError(new Error(`FAILED to post message to '${this.label}'-worker`, { cause: err }));
            }
        });
    }
}
export class DefaultWorkerFactory {
    static { this.LAST_WORKER_ID = 0; }
    constructor(label) {
        this._label = label;
        this._webWorkerFailedBeforeError = false;
    }
    create(moduleId, onMessageCallback, onErrorCallback) {
        const workerId = (++DefaultWorkerFactory.LAST_WORKER_ID);
        if (this._webWorkerFailedBeforeError) {
            throw this._webWorkerFailedBeforeError;
        }
        return new WebWorker(moduleId, workerId, this._label || 'anonymous' + workerId, onMessageCallback, (err) => {
            logOnceWebWorkerWarning(err);
            this._webWorkerFailedBeforeError = err;
            onErrorCallback(err);
        });
    }
}
