import {oneLine} from 'common-tags';

import * as fs from 'fs';

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

import {writeFile} from '../../utils/fs';

import {addImportToModule} from '../../utils/ast';

export default function() {

const oldHashes: {[module: string]: string} = {};

const newHashes: {[module: string]: string} = {};

// First, collect the hashes.

return Promise.resolve()

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

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

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

`, '@angular/router'))

.then(() => ng('build', '--prod'))

.then(() => {

fs.readdirSync('./dist')

.forEach(name => {

if (!name.match(/(main|inline|styles|\d+)\.[a-z0-9]+\.bundle\.(js|css)/)) {

return;

}

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

oldHashes[module] = hash;

});

})

.then(() => writeFile('src/app/app.component.css', 'h1 { margin: 5px; }'))

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

.then(() => ng('build', '--prod'))

.then(() => {

fs.readdirSync('./dist')

.forEach(name => {

if (!name.match(/(main|inline|styles|\d+)\.[a-z0-9]+\.bundle\.(js|css)/)) {

return;

}

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

newHashes[module] = hash;

});

})

.then(() => {

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

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

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

Object.keys(oldHashes)

.forEach(module => {

if (oldHashes[module] == newHashes[module]) {

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

}

});

});

}