import LifecycleUnit from '../../lib/src/lifecycle/Unit.ts'
import {CLIService} from './service/CLI.service.ts'
import {Unit} from '../../lib/src/lifecycle/decorators.ts'
import {Logging} from '../../lib/src/service/logging/Logging.ts'
import {parseArgs} from '../../lib/src/external/std.ts'

@Unit()
export default class CLIAppUnit extends LifecycleUnit {
    constructor(
        protected readonly cli: CLIService,
        protected readonly logger: Logging,
    ) { super() }

    public async up() {
        this.logger.verbose(`Handling CLI invocation...`)
        const args = Deno.args
        const parsed = parseArgs(args)
        console.log('args', {args, parsed})

        const keyword = parsed._[0] || ''
        const directive = this.cli.get_directive_by_keyword(String(keyword))

        this.logger.verbose(`Parsed directive: "${keyword}"`)

        if ( !directive ) {
            const help = this.cli.get_directive_by_keyword('help')
            if ( !help ) throw new Error('Usage directive not registered!')

            if ( keyword ) this.logger.error(`Invalid directive keyword: ${keyword}`)
            await help.prepare(args, parsed)
            await help.invoke()
        } else {
            await directive.prepare(args, parsed)
            await directive.invoke()
        }
    }
}