import {Event} from './types'
import {Container, StaticInstantiable} from '../../di'
import {ErrorWithContext} from '../../util'

export function getEventName<T extends Event>(eventKey: StaticInstantiable<T>): string {
    const protoName = eventKey.prototype.eventName
    if ( protoName ) {
        return protoName
    }

    try {
        const inst = Container.getContainer().make<T>(eventKey)
        if ( inst.eventName ) {
            return inst.eventName
        }
    } catch (e: unknown) {}  // eslint-disable-line no-empty

    let stringParseName = eventKey.toString()
        .split('\n')
        .map(x => x.trim())
        .filter(x => x.startsWith('this.eventName = \'') || x.startsWith('this.eventName = "'))?.[0]
        ?.split('=')?.[1]
        ?.trim()

    if ( stringParseName ) {
        stringParseName = stringParseName.endsWith(';') ? stringParseName.slice(1, -2) : stringParseName.slice(1, -1)
        if ( stringParseName ) {
            return stringParseName
        }
    }

    throw new ErrorWithContext('Unable to determine eventName from eventKey', {
        eventKey,
    })
}