package rabbitmq

import (
	"context"
	"fmt"
	"net/http"
	"net/http/httptest"
	"strings"
	"sync"
	"sync/atomic"
	"testing"
	"time"

	"github.com/gogf/gf/v2/frame/g"
	"github.com/gogf/gf/v2/os/gcfg"
	"git.5iot.com/iotlcm-public/iotlcm-worker-svr/internal/model"
)

func setChannelRefreshTestConfig(t *testing.T, gateway, proxy string) {
	t.Helper()
	oldAdapter := g.Cfg().GetAdapter()
	adapter, err := gcfg.NewAdapterContent(fmt.Sprintf(`
upstream:
  gateway:
    address: %q
    timeout: 1s
  proxy:
    address: %q
    timeout: 1s
`, gateway, proxy))
	if err != nil {
		t.Fatal(err)
	}
	g.Cfg().SetAdapter(adapter)
	t.Cleanup(func() { g.Cfg().SetAdapter(oldAdapter) })
}

func testServerAddress(server *httptest.Server) string {
	return strings.TrimPrefix(server.URL, "http://")
}

func TestRefreshChannelCallsGatewayAndProxy(t *testing.T) {
	var gatewayCalls atomic.Int32
	var proxyCalls atomic.Int32
	newServer := func(counter *atomic.Int32) *httptest.Server {
		return httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, request *http.Request) {
			counter.Add(1)
			if request.URL.Path != "/internal/channel/refresh" || request.URL.Query().Get("chanKey") != "channel-a" {
				t.Fatalf("unexpected request: %s", request.URL.String())
			}
			_, _ = w.Write([]byte(`{"code":0,"message":"success"}`))
		}))
	}
	gateway := newServer(&gatewayCalls)
	defer gateway.Close()
	proxy := newServer(&proxyCalls)
	defer proxy.Close()
	setChannelRefreshTestConfig(t, testServerAddress(gateway), testServerAddress(proxy))

	if err := refreshChannel(context.Background(), "channel-a"); err != nil {
		t.Fatal(err)
	}
	if gatewayCalls.Load() != 1 || proxyCalls.Load() != 1 {
		t.Fatalf("gateway calls=%d proxy calls=%d", gatewayCalls.Load(), proxyCalls.Load())
	}
}

func TestRenameChannelOnlyRebuildsRuntimeInstances(t *testing.T) {
	var (
		mu     sync.Mutex
		events []string
	)
	newServer := func(target string) *httptest.Server {
		return httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, request *http.Request) {
			mu.Lock()
			events = append(events, target+":"+request.URL.Path+":"+request.URL.Query().Get("chanKey"))
			mu.Unlock()
			_, _ = w.Write([]byte(`{"code":0,"message":"success"}`))
		}))
	}
	gateway := newServer("gateway")
	defer gateway.Close()
	proxy := newServer("proxy")
	defer proxy.Close()
	setChannelRefreshTestConfig(t, testServerAddress(gateway), testServerAddress(proxy))

	if err := renameChannel(context.Background(), "channel-old", "channel-new"); err != nil {
		t.Fatal(err)
	}
	want := []string{
		"gateway:/internal/channel/refresh:channel-new",
		"proxy:/internal/channel/refresh:channel-new",
		"gateway:/internal/channel/remove:channel-old",
		"proxy:/internal/channel/remove:channel-old",
	}
	if strings.Join(events, "\n") != strings.Join(want, "\n") {
		t.Fatalf("rename events = %q, want %q", events, want)
	}
}

func TestChannelControlErrorIncludesTargetStatusAndMessage(t *testing.T) {
	gateway := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		w.WriteHeader(http.StatusBadGateway)
		_, _ = w.Write([]byte(`{"code":50,"message":"carrier unavailable"}`))
	}))
	defer gateway.Close()
	setChannelRefreshTestConfig(t, testServerAddress(gateway), "127.0.0.1:1")

	err := refreshChannelTarget(context.Background(), "upstream.gateway", "channel-a")
	if err == nil {
		t.Fatal("expected target error")
	}
	message := err.Error()
	for _, part := range []string{"target=upstream.gateway", "status=502", "carrier unavailable"} {
		if !strings.Contains(message, part) {
			t.Fatalf("error %q does not contain %q", message, part)
		}
	}
}

func TestHandleChannelRefreshReturnsError(t *testing.T) {
	gateway := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		_, _ = w.Write([]byte(`{"code":50,"message":"refresh rejected"}`))
	}))
	defer gateway.Close()
	setChannelRefreshTestConfig(t, testServerAddress(gateway), "127.0.0.1:1")

	ctx, cancel := context.WithTimeout(context.Background(), 20*time.Millisecond)
	defer cancel()
	consumer := &Consumers{}
	if err := consumer.handleChannelRefresh(ctx, model.ChannelRefreshMessage{Type: "channel", ChanKey: "channel-a"}); err == nil {
		t.Fatal("refresh failure was acknowledged as success")
	}
}