import { red, bgRed } from '../external/std.ts'
import { Service } from '../../../di/src/decorator/Service.ts'
import { Logging } from '../service/logging/Logging.ts'

/**
 * Service class for handling and displaying top-level errors.
 */
@Service()
export default class RunLevelErrorHandler {
    constructor(
        protected logger: Logging,
    ) {}

    /**
     * Get the error handler function.
     * @type (e: Error) => void
     */
    get handle(): (e: Error) => void {
        return (e: Error) => {
            this.display(e)
            Deno.exit(1)
        }
    }

    /**
     * Log the error to the logger.
     * @param {Error} e
     */
    display(e: Error) {
        try {
            const error_string = `RunLevelErrorHandler invoked:

${bgRed('                                ')}
${bgRed('    UNCAUGHT TOP-LEVEL ERROR    ')}
${bgRed('                                ')}

${e.constructor ? e.constructor.name : e.name}
${red(`---------------------------------------------------`)}
${e.stack}
`
            this.logger.error(error_string, true)
        } catch (display_e) {
            // The error display encountered an error...
            // just throw the original so it makes it out
            console.error('RunLevelErrorHandler encountered an error:', display_e.message)
            throw e
        }
    }

}