handler/src/handlers/interaction.ts

import type { Module, SernAutocompleteData } from '../types/core-modules'
import {  callPlugins, executeModule } from './event-utils';
import { SernError } from '../core/structures/enums'
import { createSDT, isAutocomplete, isCommand, isContextCommand, isMessageComponent, isModal, resultPayload } from '../core/functions'
import type { UnpackedDependencies } from '../types/utility';
import * as Id from '../core/id'
import { Context } from '../core/structures/context';
import path from 'node:path';



export function interactionHandler(deps: UnpackedDependencies, defaultPrefix?: string) {
    //i wish javascript had clojure destructuring 
    const { '@sern/client': client,
            '@sern/modules': moduleManager,
            '@sern/logger': log,
            '@sern/emitter': reporter } = deps

    client.on('interactionCreate', async (event) => {

        //returns array of possible ids
        const possibleIds = Id.reconstruct(event);

        let modules = possibleIds
            .map(({ id, params }) => ({ module: moduleManager.get(id)!, params }))
            .filter(({ module }) => module !== undefined);

        if(modules.length == 0) {
            return;
        }
        const { module, params } = modules.at(0)!;
        let payload;
        // handles autocomplete
        if(isAutocomplete(event)) {
            const lookupTable = module.locals['@sern/lookup-table'] as Map<string, SernAutocompleteData>
            const subCommandGroup = event.options.getSubcommandGroup(false) ?? "",
                  subCommand = event.options.getSubcommand(false) ?? "",
                  option = event.options.getFocused(true),
                  fullPath = path.posix.join("<parent>", subCommandGroup, subCommand, option.name)
                  
            const resolvedModule = (lookupTable.get(fullPath)!.command) as Module
            payload= { module: resolvedModule , //autocomplete is not a true "module" warning cast!
                       args: [event, createSDT(module, deps, params)] };
            // either CommandTypes Slash |  ContextMessage | ContextUesr
        } else if(isCommand(event)) {
            const sdt = createSDT(module, deps, params)
            // handle CommandType.CtxUser || CommandType.CtxMsg
            if(isContextCommand(event)) {
                payload= { module, args: [event, sdt] };
            } else {
                // handle CommandType.Slash || CommandType.Both
                payload= { module, args: [Context.wrap(event, defaultPrefix), sdt] };
            }
            // handles modals or components
        } else if (isModal(event) || isMessageComponent(event)) {
            payload= { module, args: [event, createSDT(module, deps, params)] }
        } else {
            throw Error("Unknown interaction while handling in interactionCreate event " + event)
        }
        const result = await callPlugins(payload)
        if(!result.ok) {
            reporter.emit('module.activate', resultPayload('failure', module, result.error ?? SernError.PluginFailure))
            return
        }
        if(payload.args.length !== 2) {
            throw Error ('Invalid payload')
        }
        //@ts-ignore assigning final state from plugin
        payload.args[1].state = result.value

        // note: do not await this. will be blocking if long task (ie waiting for modal input)
        executeModule(reporter, log, payload);
    });
}