Tutorial

import { Effect, Schema } from "effect"
import { Command, CommandGroup, runHazelBot } from "@hazel/bot-sdk"

// In-memory task storage (use a database in production!)
const tasks: string[] = []

// Define commands
const AddTaskCommand = Command.make("task-add", {
	description: "Add a new task",
	args: { title: Schema.String },
	usageExample: "/task-add Buy groceries",
})

const ListTasksCommand = Command.make("task-list", {
	description: "List all tasks",
})

const commands = CommandGroup.make(AddTaskCommand, ListTasksCommand)

runHazelBot({
	commands,
	setup: (bot) =>
		Effect.gen(function* () {
			// Handle /task-add command
			yield* bot.onCommand(AddTaskCommand, (ctx) =>
				Effect.gen(function* () {
					tasks.push(ctx.args.title)
					yield* bot.message.send(ctx.channelId, `Added task: ${ctx.args.title}`)
				}).pipe(bot.withErrorHandler(ctx)),
			)

			// Handle /task-list command
			yield* bot.onCommand(ListTasksCommand, (ctx) =>
				Effect.gen(function* () {
					if (tasks.length === 0) {
						yield* bot.message.send(ctx.channelId, "No tasks yet!")
						return
					}
					const list = tasks.map((t, i) => `${i + 1}. ${t}`).join("\n")
					yield* bot.message.send(ctx.channelId, `**Tasks:**\n${list}`)
				}).pipe(bot.withErrorHandler(ctx)),
			)

			// React to messages mentioning "task"
			yield* bot.onMessage((message) =>
				Effect.gen(function* () {
					if (message.content.toLowerCase().includes("task")) {
						yield* bot.message.react(message, "📝")
					}
				}),
			)
		}),
})