import * as fse from 'fs-extra'
import * as path from 'path'
import * as mkdirp from 'mkdirp'
import * as rimraf from 'rimraf'
import * as rfdc from 'rfdc'
import { Phase } from './Phase'
import { Logger } from '../Logger'

export class PreparePhase extends Phase {
    public async run(): Promise<void> {
        const dir = this.config.compileDir || 'exbuild'

        Logger.verb('prepare', `remove ${dir}`)
        await new Promise<void>((res, rej) => {
            rimraf(dir, e => {
                if ( e ) {
                    rej(e)
                } else {
                    res()
                }
            })
        })

        Logger.verb('prepare', `create ${dir}`)
        await mkdirp(dir)

        for ( const src of this.tsconfig.include ) {
            Logger.verb('prepare', `copy ${src}`)
            await fse.copy(src, path.join(dir, src))
        }

        const transformerPath = path.resolve(__dirname, '..', 'transformer.js')
        Logger.verb('prepare', `copy ${transformerPath}`)
        await fse.copy(transformerPath, path.join(dir, 'transformer.js'))

        const tsconfig = rfdc()(this.tsconfig)
        const outDir = tsconfig?.compilerOptions?.outDir || './lib'
        if ( !tsconfig.compilerOptions ) {
            tsconfig.compilerOptions = {}
        }

        if ( !tsconfig.compilerOptions.plugins ) {
            tsconfig.compilerOptions.plugins = []
        }

        tsconfig.compilerOptions.plugins.push({
            transform: './transformer.js',
            import: 'identifierProgram',
        })

        tsconfig.compilerOptions.plugins.push({
            transform: './transformer.js',
            import: 'transformProgram',
            transformProgram: true,
        })

        /* tsconfig.compilerOptions.plugins.push({
            transform: './transformer.js',
            import: 'transformerProgram',
            after: true,
        })*/

        tsconfig.compilerOptions.outDir = path.join('..', outDir)

        fse.writeFileSync(path.join(dir, 'tsconfig.json'), JSON.stringify(tsconfig, undefined, 4))
    }
}