/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/

import * as es from 'event-stream';
import { Stream } from 'stream';
import assign = require('object-assign');
import remote = require('gulp-remote-src');
const flatmap = require('gulp-flatmap');
const vzip = require('gulp-vinyl-zip');
const filter = require('gulp-filter');
const rename = require('gulp-rename');
const util = require('gulp-util');
const buffer = require('gulp-buffer');
const json = require('gulp-json-editor');
const webpack = require('webpack');
const webpackGulp = require('webpack-stream');
import * as fs from 'fs';
import * as path from 'path';
import * as vsce from 'vsce';
import * as File from 'vinyl';

export function fromLocal(extensionPath: string, sourceMappingURLBase?: string): Stream {
	let result = es.through();

	vsce.listFiles({ cwd: extensionPath, packageManager: vsce.PackageManager.Yarn }).then(fileNames => {
		const files = fileNames
			.map(fileName => path.join(extensionPath, fileName))
			.map(filePath => new File({
				path: filePath,
				stat: fs.statSync(filePath),
				base: extensionPath,
				contents: fs.createReadStream(filePath) as any
			}));

		const filesStream = es.readArray(files);

		// check for a webpack configuration file, then invoke webpack
		// and merge its output with the files stream. also rewrite the package.json
		// file to a new entry point
		if (fs.existsSync(path.join(extensionPath, 'extension.webpack.config.js'))) {
			const packageJsonFilter = filter('package.json', { restore: true });

			const patchFilesStream = filesStream
				.pipe(packageJsonFilter)
				.pipe(buffer())
				.pipe(json(data => {
					// hardcoded entry point directory!
					data.main = data.main.replace('/out/', /dist/);
					return data;
				}))
				.pipe(packageJsonFilter.restore);

			const webpackConfig = {
				...require(path.join(extensionPath, 'extension.webpack.config.js')),
				...{ mode: 'production', stats: 'errors-only' }
			};
			const webpackStream = webpackGulp(webpackConfig, webpack)
				.pipe(es.through(function (data) {
					data.stat = data.stat || {};
					data.base = extensionPath;
					this.emit('data', data);
				}))
				.pipe(es.through(function (data: File) {
					// source map handling:
					// * rewrite sourceMappingURL
					// * save to disk so that upload-task picks this up
					if (sourceMappingURLBase) {
						const contents = (<Buffer>data.contents).toString('utf8');
						data.contents = Buffer.from(contents.replace(/\n\/\/# sourceMappingURL=(.*)$/gm, function (_m, g1) {
							return `\n//# sourceMappingURL=${sourceMappingURLBase}/extensions/${path.basename(extensionPath)}/dist/${g1}`;
						}), 'utf8');

						if (/\.js\.map$/.test(data.path)) {
							if (!fs.existsSync(path.dirname(data.path))) {
								fs.mkdirSync(path.dirname(data.path));
							}
							fs.writeFileSync(data.path, data.contents);
						}
					}
					this.emit('data', data);
				}))
				;

			es.merge(webpackStream, patchFilesStream)
				// .pipe(es.through(function (data) {
				// 	// debug
				// 	console.log('out', data.path, data.contents.length);
				// 	this.emit('data', data);
				// }))
				.pipe(result);

		} else {
			filesStream.pipe(result);
		}

	}).catch(err => result.emit('error', err));

	return result;
}

function error(err: any): Stream {
	const result = es.through();
	setTimeout(() => result.emit('error', err));
	return result;
}

const baseHeaders = {
	'X-Market-Client-Id': 'VSCode Build',
	'User-Agent': 'VSCode Build',
	'X-Market-User-Id': '291C1CD0-051A-4123-9B4B-30D60EF52EE2',
};

export function fromMarketplace(extensionName: string, version: string): Stream {
	const filterType = 7;
	const value = extensionName;
	const criterium = { filterType, value };
	const criteria = [criterium];
	const pageNumber = 1;
	const pageSize = 1;
	const sortBy = 0;
	const sortOrder = 0;
	const flags = 0x1 | 0x2 | 0x80;
	const assetTypes = ['Microsoft.VisualStudio.Services.VSIXPackage'];
	const filters = [{ criteria, pageNumber, pageSize, sortBy, sortOrder }];
	const body = JSON.stringify({ filters, assetTypes, flags });
	const headers: any = assign({}, baseHeaders, {
		'Content-Type': 'application/json',
		'Accept': 'application/json;api-version=3.0-preview.1',
		'Content-Length': body.length
	});

	const options = {
		base: 'https://marketplace.visualstudio.com/_apis/public/gallery',
		requestOptions: {
			method: 'POST',
			gzip: true,
			headers,
			body: body
		}
	};

	return remote('/extensionquery', options)
		.pipe(flatmap((stream, f) => {
			const rawResult = f.contents.toString('utf8');
			const result = JSON.parse(rawResult);
			const extension = result.results[0].extensions[0];
			if (!extension) {
				return error(`No such extension: ${extension}`);
			}

			const metadata = {
				id: extension.extensionId,
				publisherId: extension.publisher,
				publisherDisplayName: extension.publisher.displayName
			};

			const extensionVersion = extension.versions.filter(v => v.version === version)[0];
			if (!extensionVersion) {
				return error(`No such extension version: ${extensionName} @ ${version}`);
			}

			const asset = extensionVersion.files.filter(f => f.assetType === 'Microsoft.VisualStudio.Services.VSIXPackage')[0];
			if (!asset) {
				return error(`No VSIX found for extension version: ${extensionName} @ ${version}`);
			}

			util.log('Downloading extension:', util.colors.yellow(`${extensionName}@${version}`), '...');

			const options = {
				base: asset.source,
				requestOptions: {
					gzip: true,
					headers: baseHeaders
				}
			};

			return remote('', options)
				.pipe(flatmap(stream => {
					const packageJsonFilter = filter('package.json', { restore: true });

					return stream
						.pipe(vzip.src())
						.pipe(filter('extension/**'))
						.pipe(rename(p => p.dirname = p.dirname.replace(/^extension\/?/, '')))
						.pipe(packageJsonFilter)
						.pipe(buffer())
						.pipe(json({ __metadata: metadata }))
						.pipe(packageJsonFilter.restore);
				}));
		}));
}