/* ------------------------------------------
 * This module tests the compiled TypeScript files
 * -------------------------------------------- */
import plugins = require('./mod02.plugins')
import paths = require('../npmts.paths')

import * as q from 'q'

import { npmtsOra } from '../npmts.log'
import { INpmtsConfig } from '../npmts.config'

/**
 * runs mocha
 * @returns INpmtsConfig
 */
let mocha = function (configArg: INpmtsConfig) {
    npmtsOra.text('Instrumentalizing and testing transpiled JS')
    npmtsOra.end() // end npmtsOra for tests.
    let done = q.defer()

    let coverageSmartstream = new plugins.smartstream.Smartstream([
        plugins.gulp.src([plugins.path.join(paths.cwd, './ts/**/*.ts')]),
        plugins.gulpSourcemaps.init(),
        plugins.gulpTypeScript({
            target: 'ES5',
            emitDecoratorMetadata: true,
            experimentalDecorators: true,
            lib: ['ES2015.Promise','ES5','ES2015.Generator']
        }),
        plugins.gulpIstanbul({
        }),
        plugins.gulpSourcemaps.write(),
        plugins.gulpFunction.forEach(async file => {
            file.path = file.path.replace(paths.tsDir, paths.distDir)
        }),
        plugins.gulpInjectModules(),
        plugins.through2.obj(
            (file, enc, cb) => {
                cb()
            },
            (cb) => {
                cb()
            }
        )
    ])

    let localSmartstream = new plugins.smartstream.Smartstream([
        plugins.gulp.src([plugins.path.join(paths.cwd, 'test/test.ts')]),
        plugins.gulpTypeScript({
            target: 'ES5',
            emitDecoratorMetadata: true,
            experimentalDecorators: true,
            lib: ['ES2015.Promise','ES5','ES2015.Generator']
        }),
        plugins.gulpInjectModules(),
        plugins.gulpMocha(),
        plugins.gulpIstanbul.writeReports({
            dir: plugins.path.join(paths.cwd, './coverage'),
            reporters: ['lcovonly', 'json', 'text', 'text-summary']
        })
    ])
    coverageSmartstream.run()
        .then(
        () => {
            plugins.beautylog.info('code is now transpiled to ES5, instrumented with istanbul, and injected for mocha!')
            return localSmartstream.run()
                .then(() => { done.resolve(configArg) }, (err) => {
                    plugins.beautylog.error('Tests failed!')
                    console.log(err)
                    if (configArg.watch) {
                        done.resolve(configArg)
                    } else {
                        process.exit(1)
                    }
                })
        },
        (err) => {
            console.log(err)
        })
    return done.promise
}

let coverage = function (configArg: INpmtsConfig) {
    let done = q.defer()
    plugins.smartcov.get.percentage(plugins.path.join(paths.coverageDir, 'lcov.info'), 2)
        .then(function (percentageArg) {
            if (percentageArg >= configArg.coverageTreshold) {
                plugins.beautylog.ok(
                    `${percentageArg.toString()}% `
                    + `coverage exceeds your treshold of `
                    + `${configArg.coverageTreshold.toString()}%`
                )
            } else {
                plugins.beautylog.warn(
                    `${percentageArg.toString()}% `
                    + `coverage fails your treshold of `
                    + `${configArg.coverageTreshold.toString()}%`
                )
                plugins.beautylog.error('exiting due to coverage failure')
                if (!configArg.watch) { process.exit(1) }
            }
            done.resolve(configArg)
        })
    return done.promise
}

export let run = function (configArg: INpmtsConfig) {
    let done = q.defer<INpmtsConfig>()
    let config = configArg
    if (config.test === true) {
        npmtsOra.text('now starting tests')
        plugins.beautylog.log(
            '------------------------------------------------------\n' +
            '*************************** TESTS: ***************************\n' +
            '--------------------------------------------------------------'
        )

        mocha(config)
            .then(coverage)
            .then(() => {
                done.resolve(config)
            }).catch(err => { console.log(err) })
    } else {
        npmtsOra.end()
        done.resolve(config)
    }
    return done.promise
}