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

class PackageAbsentState extends State {
    constructor(host, config) {
        if ( !host.packages ) {
            throw new Error(`Cannot apply package absent state to host ${host.name}: missing package manager API.`)
        }
        super(host, config)
    }

    async reverse() {
        return this._host.packages.install(this._config.package)
    }

    async check() {
        return !(await this._host.packages.is_installed(this._config.package))
    }

    async apply() {
        return this._host.packages.uninstall(this._config.package)
    }

    failure_message() {
        return `The package "${this._config.package}" still exists on host "${this._host.name}."`
    }

    check_message() {
        return this.failure_message()
    }
}

module.exports = exports = PackageAbsentState