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

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

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

    async check() {
        try {
            const path = await this._path()
            const permissions = `${await path.permissions()}`.trim()
            const target = `${this._config.level}`.trim()
            return permissions === target
        } catch (e) {}
        return false
    }

    async reverse() {
        if ( this._config.revert_to ) {
            const path = await this._path()
            await path.permissions(this._config.revert_to, this._config.recursive)
        } else {
            this.output.warn(`Permission state does not support automatic reversal. Specify the revert_to config 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 PermissionState: ${path}`)
        return path
    }

    failure_message() {
        return `The resource permissions for "${this._config.path}" on host "${this._host.name}" are invalid.`
    }

    check_message() {
        return this.failure_message()
    }

    display() {
        return `Set filesystem permissions of resource ${this._config.path}...`
    }
}

module.exports = exports = PermissionState