import { describe, expect } from "bun:test"

import { Effect, Layer, Schema } from "effect"

import { Agent } from "../../src/agent/agent"

import { MessageID, SessionID } from "../../src/session/schema"

import { Tool } from "@/tool/tool"

import { Truncate } from "@/tool/truncate"

import { testEffect } from "../lib/effect"

const it = testEffect(Layer.mergeAll(Truncate.defaultLayer, Agent.defaultLayer))

const params = Schema.Struct({ input: Schema.String })

function makeTool(id: string, executeFn?: () => void) {

return {

description: "test tool",

parameters: params,

execute() {

executeFn?.()

return Effect.succeed({ title: "test", output: "ok", metadata: {} })

},

}

}

describe("Tool.define", () => {

it.effect("object-defined tool does not mutate the original init object", () =>

Effect.gen(function* () {

const original = makeTool("test")

const originalExecute = original.execute

const info = yield* Tool.define("test-tool", Effect.succeed(original))

yield* info.init()

yield* info.init()

yield* info.init()

expect(original.execute).toBe(originalExecute)

}),

)

it.effect("effect-defined tool returns fresh objects and is unaffected", () =>

Effect.gen(function* () {

const info = yield* Tool.define(

"test-fn-tool",

Effect.succeed(() => Effect.succeed(makeTool("test"))),

)

const first = yield* info.init()

const second = yield* info.init()

expect(first).not.toBe(second)

}),

)

it.effect("object-defined tool returns distinct objects per init() call", () =>

Effect.gen(function* () {

const info = yield* Tool.define("test-copy", Effect.succeed(makeTool("test")))

const first = yield* info.init()

const second = yield* info.init()

expect(first).not.toBe(second)

}),

)

it.effect("execute receives decoded parameters", () =>

Effect.gen(function* () {

const parameters = Schema.Struct({

count: Schema.NumberFromString.pipe(Schema.optional, Schema.withDecodingDefaultType(Effect.succeed(5))),

})

const calls: Array<Schema.Schema.Type<typeof parameters>> = []

const info = yield* Tool.define(

"test-decoded",

Effect.succeed({

description: "test tool",

parameters,

execute(args: Schema.Schema.Type<typeof parameters>) {

calls.push(args)

return Effect.succeed({ title: "test", output: "ok", metadata: { truncated: false } })

},

}),

)

const ctx: Tool.Context = {

sessionID: SessionID.descending(),

messageID: MessageID.ascending(),

agent: "build",

abort: new AbortController().signal,

messages: [],

metadata() {

return Effect.void

},

ask() {

return Effect.void

},

}

const tool = yield* info.init()

const execute = tool.execute as unknown as (args: unknown, ctx: Tool.Context) => ReturnType<typeof tool.execute>

yield* execute({}, ctx)

yield* execute({ count: "7" }, ctx)

expect(calls).toEqual([{ count: 5 }, { count: 7 }])

}),

)

})