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

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

    async apply() {
        if ( !(await this.check()) ) {
            const path = await this._path()
            await path.ownership(this._config.owners, !!this._config.recursive)
        }
    }

    async check() {
        const path = await this._path()
        const owners = await path.ownership()

        if ( this._config.owners.user && owners.user !== this._config.owners.user ) return false
        else if ( this._config.owners.group && owners.group !== this._config.owners.group ) return false
        return true
    }

    async reverse() {
        if ( await this.check() ) {
            if (this._config.revert_to) {
                const path = await this._path()
                await path.ownership(this._config.revert_to, !!this._config.recursive)
            } else {
                this.output.warn(`Owner state does not support automatic reversal. Specify the revert_to config key for this functionality. (Host: ${this._host.name})`)
            }
        }
    }

    async _path() {
        const path = await this._host.get_path(this._config.path)
        await path.classify()
        if ( !path.is_valid() ) throw new Error(`Invalid path for OwnerState: ${path}`)
        return path
    }

    failure_message() {
        return `The ownership state of the file "${this._config.path}" on host "${this._host.name}" is invalid.`
    }

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

module.exports = exports = OwnerState