const { Service } = require('flitter-di')

/*
 * states Service
 * -------------------------------------------------------------
 * This is a service file that will be made available through Flitter's
 * dependency injector to the rest of the application based on its given
 * canonical name.
 *
 * e.g. app.di().service("states")
 */
class StatesService extends Service {
    static #state_map = {
        // TODO apache and nginx states - virtual host, reverse proxy
        // TODO package repository states - import keys, install repository
        // TODO service manager states - service enabled, service installed, stopped
        // TODO git states - clone repo, ref checked out
        // TODO package states - uninstalled

        'fs.file': require('../classes/state/fs/FileState'),
        'fs.directory': require('../classes/state/fs/DirectoryState'),
        'fs.unpack': require('../classes/state/fs/UnpackState'),
        'fs.pack': require('../classes/state/fs/PackState'),
        'fs.permission': require('../classes/state/fs/PermissionState'),
        'fs.ownership': require('../classes/state/fs/OwnerState'),

        'package.present': require('../classes/state/os/PackageState'),
        'package.updates': require('../classes/state/os/UpdateState'),
        'package.cache.clear': require('../classes/state/os/PackageCacheClearedState'),

        'service.running': require('../classes/state/os/ServiceState'),
        'service.restarted': require('../classes/state/os/ServiceRestartState'),
        'service.daemon.reloaded': require('../classes/state/os/ServiceDaemonReloadState'),

        'web.download': require('../classes/state/fs/DownloadState'),
    }

    static get services() {
        return [...super.services, 'app', 'configs']
    }

    from_config(host, state_config) {
        const type = state_config.type
        delete state_config.type

        const StepClass = this.constructor.#state_map[type]
        this.app.di().make(StepClass)
        if ( !StepClass ) throw new Error(`Invalid or unknown step type: ${type}`)

        return new StepClass(host, state_config)
    }
}

module.exports = exports = StatesService