import AppClass from '../../../lib/src/lifecycle/AppClass.ts'
import {Service} from '../../../di/src/decorator/Service.ts'
import {Collection} from '../../../lib/src/collection/Collection.ts'
import {Directive} from '../directive/Directive.ts'
import {Logging} from '../../../lib/src/service/logging/Logging.ts'

/**
 * Error thrown when a directive registered with the same keyword as
 * an existing directive.
 * @extends Error
 */
export class DuplicateCLIDirectiveError extends Error {
    constructor(keyword: string) {
        super(`A CLI directive with the keyword "${keyword}" already exists.`)
    }
}

/**
 * Service for registering and managing CLI directives.
 * @extends AppClass
 */
@Service()
export class CLIService extends AppClass {
    protected directives: Collection<Directive> = new Collection<Directive>()

    constructor(
        protected readonly logger: Logging,
    ) { super() }

    /**
     * Find a registered directive using its keyword, if one exists.
     * @param {string} keyword
     * @return Directive | undefined
     */
    public get_directive_by_keyword(keyword: string): Directive | undefined {
        return this.directives.firstWhere('keyword', '=', keyword)
    }

    /**
     * Get a collection of all registered directives.
     * @return Collection<Directive>
     */
    public get_directives() {
        return this.directives.clone()
    }

    /**
     * Register a directive with the service.
     * @param {Directive} directive
     */
    public register_directive(directive: Directive) {
        if ( this.get_directive_by_keyword(directive.keyword) ) {
            throw new DuplicateCLIDirectiveError(directive.keyword)
        }

        this.logger.verbose(`Registering CLI directive with keyword: ${directive.keyword}`)
        this.directives.push(directive)
    }

    public show_logo() {
        return true
    }

    public get_logo() {
        return `██████╗  █████╗ ████████╗ ██████╗ ███╗   ██╗
██╔══██╗██╔══██╗╚══██╔══╝██╔═══██╗████╗  ██║
██║  ██║███████║   ██║   ██║   ██║██╔██╗ ██║
██║  ██║██╔══██║   ██║   ██║   ██║██║╚██╗██║
██████╔╝██║  ██║   ██║   ╚██████╔╝██║ ╚████║
╚═════╝ ╚═╝  ╚═╝   ╚═╝    ╚═════╝ ╚═╝  ╚═══╝`
    }
}