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

class FileState extends State {
    async apply() {
        if ( !(await this.check()) ) {
            const path = await this._path()
            await path.touch()

            if ( this._config.contents ) {
                await path.echo(this._config.contents)
            } else if ( this._config.template ) {
                await path.copy_from(this._config.template)
            }
        }
    }

    async check() {
        const path = await this._path()
        await path.classify()
        return path.is_file()
    }

    async reverse() {
        if ( await this.check() ) {
            const path = await this._path()
            await path.unlink()
        }
    }

    async _path() {
        if ( !this._config.path ) throw new Error('Missing path config for FileState.')
        return this._host.get_path(this._config.path)
    }

    failure_message() {
        return `The file "${this._config.path}" does not exist on the host "${this._host.name}."`
    }

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

module.exports = exports = FileState