import * as fs from 'fs';

import {ng} from '../../utils/process';

import {writeFile, prependToFile, replaceInFile} from '../../utils/fs';

const OUTPUT_RE = /(main|polyfills|vendor|inline|styles|\d+)\.[a-z0-9]+\.(chunk|bundle)\.(js|css)$/;

function generateFileHashMap(): Map<string, string> {

const hashes = new Map<string, string>();

fs.readdirSync('./dist')

.forEach(name => {

if (!name.match(OUTPUT_RE)) {

return;

}

const [module, hash] = name.split('.');

hashes.set(module, hash);

});

return hashes;

}

function validateHashes(

oldHashes: Map<string, string>,

newHashes: Map<string, string>,

shouldChange: Array<string>): void {

console.log(' Validating hashes...');

console.log(` Old hashes: ${JSON.stringify([...oldHashes])}`);

console.log(` New hashes: ${JSON.stringify([...newHashes])}`);

oldHashes.forEach((hash, module) => {

if (hash == newHashes.get(module)) {

if (shouldChange.includes(module)) {

throw new Error(`Module "${module}" did not change hash (${hash})...`);

}

} else if (!shouldChange.includes(module)) {

throw new Error(`Module "${module}" changed hash (${hash})...`);

}

});

}

export default function() {

// TODO(architect): Delete this test. It is now in devkit/build-angular.

return;

let oldHashes: Map<string, string>;

let newHashes: Map<string, string>;

// First, collect the hashes.

return Promise.resolve()

.then(() => ng('generate', 'module', 'lazy', '--routing'))

.then(() => prependToFile('src/app/app.module.ts', `

import { RouterModule } from '@angular/router';

import { ReactiveFormsModule } from '@angular/forms';

`))

.then(() => replaceInFile('src/app/app.module.ts', 'imports: [', `imports: [

RouterModule.forRoot([{ path: "lazy", loadChildren: "./lazy/lazy.module#LazyModule" }]),

ReactiveFormsModule,

`))

.then(() => ng('build', '--output-hashing=all'))

.then(() => {

oldHashes = generateFileHashMap();

})

.then(() => ng('build', '--output-hashing=all'))

.then(() => {

newHashes = generateFileHashMap();

})

.then(() => {

validateHashes(oldHashes, newHashes, []);

oldHashes = newHashes;

})

.then(() => writeFile('src/styles.css', 'body { background: blue; }'))

.then(() => ng('build', '--output-hashing=all'))

.then(() => {

newHashes = generateFileHashMap();

})

.then(() => {

validateHashes(oldHashes, newHashes, ['styles']);

oldHashes = newHashes;

})

.then(() => writeFile('src/app/app.component.css', 'h1 { margin: 10px; }'))

.then(() => ng('build', '--output-hashing=all'))

.then(() => {

newHashes = generateFileHashMap();

})

.then(() => {

validateHashes(oldHashes, newHashes, ['main']);

oldHashes = newHashes;

})

.then(() => prependToFile('src/app/lazy/lazy.module.ts', `

import { ReactiveFormsModule } from '@angular/forms';

`))

.then(() => replaceInFile('src/app/lazy/lazy.module.ts', 'imports: [', `

imports: [

ReactiveFormsModule,

`))

.then(() => ng('build', '--output-hashing=all'))

.then(() => {

newHashes = generateFileHashMap();

})

.then(() => {

validateHashes(oldHashes, newHashes, ['inline', '0']);

});

}