const State = require('../State')

class YarnInstallState extends State {
    #ran_once = false

    static get services() {
        return [...super.services, 'output']
    }

    async apply() {
        const cmd = `cd "${this._config.path}" && yarn install`
        await this._host.run(cmd)
        this.#ran_once = true
    }

    async check() {
        if ( this._config.force ) return this.#ran_once
        else {
            const node_modules = this._host.get_path(`${this._config.path}/node_modules`)
            await node_modules.classify()
            return node_modules.is_directory()
        }
    }

    async reverse() {
        const node_modules = this._host.get_path(`${this._config.path}/node_modules`)
        await node_modules.unlink()
    }

    failure_message() {
        return `The Yarn packages at ${this._config.path} need to be installed.`
    }

    check_message() {
        return this.failure_message()
    }

    display() {
        return `Ensure that the Yarn packages at ${this._config.path} are installed...`
    }
}

module.exports = exports = YarnInstallState