package contracts_test

import (
	"encoding/json"
	"os"
	"strings"
	"testing"
)

func TestCurrentContractTopology(t *testing.T) {
	type route struct {
		RoutingKey string `json:"routing_key"`
		BindingKey string `json:"binding_key"`
		Queue      string `json:"queue"`
	}
	var topology struct {
		Ownership  string `json:"ownership"`
		Dispatcher struct {
			Exchange string `json:"exchange"`
			Control  route  `json:"control"`
			Task     route  `json:"task"`
		} `json:"dispatcher"`
		SaaS struct {
			Exchange string `json:"exchange"`
			Result   route  `json:"result"`
		} `json:"saas"`
	}
	data, err := os.ReadFile("local/mq-topology.json")
	if err != nil {
		t.Fatal(err)
	}
	if err := json.Unmarshal(data, &topology); err != nil {
		t.Fatal(err)
	}
	if topology.Ownership != "saas" || topology.Dispatcher.Exchange != "agent-call.dispatchers.v1" || topology.SaaS.Exchange != "agent-call.saas.v1" {
		t.Fatalf("unapproved owner/exchanges: %+v", topology)
	}
	if topology.Dispatcher.Control.Queue != "agent-call.d.<dispatcher_id>.control.v1" || topology.Dispatcher.Control.BindingKey != "d.<dispatcher_id>.control.in" {
		t.Fatalf("wrong control queue or exact binding: %+v", topology.Dispatcher.Control)
	}
	if topology.Dispatcher.Task.Queue != "agent-call.d.<dispatcher_id>.task.<task_id>.v1" || topology.Dispatcher.Task.BindingKey != "d.<dispatcher_id>.task.<task_id>.in" {
		t.Fatalf("wrong per-task queue or binding: %+v", topology.Dispatcher.Task)
	}
	result := topology.SaaS.Result
	if result.Queue != "agent-call.saas.events.v1" || result.RoutingKey != "d.<dispatcher_id>.out" || result.BindingKey != result.RoutingKey {
		t.Fatalf("SaaS must consume a shared queue bound exactly to each D: %+v", result)
	}
	for _, r := range []route{topology.Dispatcher.Control, topology.Dispatcher.Task, result} {
		if r.RoutingKey != r.BindingKey || strings.ContainsAny(r.BindingKey, "*#") {
			t.Fatalf("route must have exact binding: %+v", r)
		}
	}
	for _, id := range []string{"d-1", "d-2"} {
		key := strings.ReplaceAll(result.RoutingKey, "<dispatcher_id>", id)
		if len(key) > 255 || key == result.BindingKey {
			t.Fatalf("invalid dispatcher-specific binding: %q", key)
		}
	}
}