import * as childProcess from 'child_process'
import {Phase} from './Phase'
import {ExtolloCompileConfig} from '../types'
import {Logger} from '../Logger'
import {ExCompileError} from '../ExCompileError'

export class CompilePhase extends Phase {
    constructor(
        config: ExtolloCompileConfig,
        tsconfig: any,
        protected readonly tsconfigPath: string,
    ) {
        super(config, tsconfig)
    }

    public run(): Promise<void> {
        Logger.verb('tsc', 'transpile sources')
        const tsc = childProcess.spawn('tsc', ['-p', this.tsconfigPath])

        tsc.stdout.on('data', (output: Buffer) => {
            Logger.info('tsc', output.toString('utf-8'))
        })

        tsc.stderr.on('data', (output: Buffer) => {
            Logger.info('tsc', output.toString('utf-8'))
        })

        return new Promise((res, rej) => {
            tsc.on('exit', code => {
                if ( code === 0 ) {
                    res()
                } else {
                    rej(new ExCompileError('Subprocess exited with non-zero exit code'))
                }
            })
        })
    }
}