import * as repl from 'repl'
import { Context, createContext, runInContext } from 'vm'
import { readInput, SupportedLoader } from './build'
import { logv } from './util'

export function runRepl(
    context: Context,
    loader: SupportedLoader,
    exported?: string[]
) {
    if (exported) {
        console.log(`Exports: ${exported.join(', ')}`)
    }
    console.log(`REPL Loader: ${loader.toUpperCase()}`)

    const r = repl
        .start({
            useGlobal: true,
            eval: (cmd, context, _filename, callback) => {
                //add async wrapper
                //                 context.__FILE_NODE__INTERNAL__ = callback
                //                 cmd = `(async () => {
                // ${cmd}

                // })()`

                let js = readInput(cmd, loader)
                logv(`Transformed: ${js}`)
                try {
                    let val = runInContext(js, context)
                    callback(null, val)
                } catch (e) {
                    if (e instanceof Error) {
                        callback(e, null)
                    } else {
                        callback(new Error((e as any).toString()), null)
                    }
                }
            },
        })
        .on('close', () => process.exit(0))

    Object.keys(context).forEach(key =>
        Object.defineProperty(r.context, key, {
            configurable: false,
            enumerable: true,
            value: context[key],
        })
    )

    createContext(r.context)
}