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

class FileContentState extends State {
    static get services() {
        return [...super.services, 'hosts']
    }

    async apply() {
        const target_path = await this._target()
        if ( target_path.is_valid() ) {

        }

        if ( this._config.source ) {
            const source_path = await this._source()
            await source_path.copy_to(target_path)
        } else {
            await target_path.echo(this._config.contents)
        }
    }

    async check() {
        if ( this._config.source ) {
            const source_path = await this._source()
            const source_hash = await source_path.hash()

            const target_path = await this._target()
            if ( !target_path.is_file() ) return false
            const target_hash = await target_path.hash()

            return source_hash === target_hash
        } else {
            const localhost = this.hosts.get('localhost')
            const temp_path = await localhost.get_temp_file()
            await temp_path.echo(this._config.contents)
            const source_hash = await temp_path.hash()

            const target_path = await this._target()
            if ( !target_path.is_file() ) return false
            const target_hash = await target_path.hash()

            return source_hash === target_hash
        }
    }

    async reverse() {
        await (await this._target()).echo('')
    }

    async _target() {
        if ( typeof this._config.target === 'string' ) {
            return UniversalPath.fromString(this._config.target)
        } else return this._config.target
    }

    async _source() {
        if ( typeof this._config.target === 'string' ) {
            return UniversalPath.fromString(this._config.target)
        } else return this._config.target
    }
}

module.exports = exports = FileContentState