package stdio

import (
	"bufio"
	"encoding/json"
	"io"
	"testing"
	"time"
)

// 1887/A11: a bundle pulls one message through its runtime, naming the worker and the wait, and settles it by the id the
// runtime gave.
func TestABundlePullsAndSettlesThroughTheRuntime(t *testing.T) {
	t.Setenv(ServedAs, "mesh-build-go")
	inR, inW := io.Pipe()
	outR, outW := io.Pipe()
	got := make(chan *Pulled, 1)
	go func() {
		_ = ServeOn("", []Tool{{Name: "start", Run: func(map[string]any) (any, error) {
			p, err := SeatPull("SEAT_NODE_BUILD_GO_DELIVERY_worker", 1500*time.Millisecond)
			if err != nil {
				return nil, err
			}
			got <- p
			return map[string]any{}, SeatSettle(p.ID, SettleAck)
		}}}, inR, outW)
	}()
	lines := bufio.NewScanner(outR)
	next := func() map[string]any {
		done := make(chan map[string]any, 1)
		go func() {
			if lines.Scan() {
				var m map[string]any
				_ = json.Unmarshal(lines.Bytes(), &m)
				done <- m
			}
		}()
		select {
		case m := <-done:
			return m
		case <-time.After(3 * time.Second):
			t.Fatal("the bundle said nothing")
			return nil
		}
	}
	send := func(m map[string]any) { b, _ := json.Marshal(m); _, _ = inW.Write(append(b, '\n')) }
	send(map[string]any{"jsonrpc": "2.0", "id": 1, "method": "tools/call", "params": map[string]any{"name": "start"}})
	asked := next()
	params, _ := asked["params"].(map[string]any)
	if asked["method"] != "mesh/seat.pull" || params["worker"] != "SEAT_NODE_BUILD_GO_DELIVERY_worker" || params["wait_ms"] != 1500.0 {
		t.Fatalf("asked %v", asked)
	}
	send(map[string]any{"jsonrpc": "2.0", "id": asked["id"], "result": map[string]any{"id": "p1", "worker": "SEAT_NODE_BUILD_GO_DELIVERY_worker",
		"subject": "mesh.seat.node-build-go.accept.delivery", "body": map[string]any{"v": 1}, "delivered": 1}})
	p := <-got
	if p.ID != "p1" || string(p.Body) != `{"v":1}` {
		t.Fatalf("pulled %+v", p)
	}
	asked = next()
	params, _ = asked["params"].(map[string]any)
	if asked["method"] != "mesh/seat.settle" || params["id"] != "p1" || params["fate"] != "ack" {
		t.Fatalf("settled %v", asked)
	}
	send(map[string]any{"jsonrpc": "2.0", "id": asked["id"], "result": map[string]any{}})
}