package inbound

import (
	"encoding/json"
	"net"
	"net/http"
	"net/http/httptest"
	"testing"
	"time"

	cmpp "github.com/bigwhite/gocmpp"
	cmpputils "github.com/bigwhite/gocmpp/utils"
)

func TestInboundServerAuthenticatesAndSubmits(t *testing.T) {
	account := "100001"
	password := "secret-hash"
	var gotAuth authRequest
	var gotSubmit submitRequest
	api := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch r.URL.Path {
		case "/api/gateway/events/inbound/authenticate":
			if err := json.NewDecoder(r.Body).Decode(&gotAuth); err != nil {
				t.Fatalf("decode auth: %v", err)
			}
			_ = json.NewEncoder(w).Encode(authResponse{PasswordCipher: password})
		case "/api/gateway/events/inbound/submit":
			if err := json.NewDecoder(r.Body).Decode(&gotSubmit); err != nil {
				t.Fatalf("decode submit: %v", err)
			}
			_ = json.NewEncoder(w).Encode(submitResponse{Accepted: true, MessageID: "MSG-1"})
		default:
			t.Fatalf("unexpected api path: %s", r.URL.Path)
		}
	}))
	defer api.Close()

	addr := reserveTCPAddr(t)
	go func() {
		_ = (Server{Addr: addr, APIBaseURL: api.URL + "/api"}).ListenAndServe()
	}()
	time.Sleep(300 * time.Millisecond)

	client := cmpp.NewClient(cmpp.V30)
	defer client.Disconnect()
	if err := client.Connect(addr, account, password, 2*time.Second); err != nil {
		t.Fatalf("connect inbound cmpp: %v", err)
	}

	content, err := cmpputils.Utf8ToUcs2("测试入站")
	if err != nil {
		t.Fatalf("encode content: %v", err)
	}
	_, err = client.SendReqPkt(&cmpp.Cmpp3SubmitReqPkt{
		PkTotal:            1,
		PkNumber:           1,
		RegisteredDelivery: 1,
		MsgLevel:           1,
		ServiceId:          "cmpp",
		FeeUserType:        2,
		FeeTerminalId:      "13500002696",
		MsgFmt:             8,
		MsgSrc:             account,
		FeeType:            "02",
		FeeCode:            "0",
		SrcId:              "10690000",
		DestUsrTl:          1,
		DestTerminalId:     []string{"13500002696"},
		MsgLength:          uint8(len(content)),
		MsgContent:         content,
	})
	if err != nil {
		t.Fatalf("send submit: %v", err)
	}
	rsp := recvSubmitRsp(t, client)
	if rsp.Result != 0 || rsp.MsgId == 0 {
		t.Fatalf("unexpected submit response: %+v", rsp)
	}
	if gotAuth.Account != account || gotAuth.AuthSource == "" || gotAuth.RemoteIP == "" {
		t.Fatalf("unexpected auth payload: %+v", gotAuth)
	}
	if gotSubmit.Account != account || gotSubmit.PhoneNumber != "13500002696" || gotSubmit.Content != "测试入站" {
		t.Fatalf("unexpected submit payload: %+v", gotSubmit)
	}
}

func reserveTCPAddr(t *testing.T) string {
	t.Helper()
	listener, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		t.Fatalf("reserve tcp addr: %v", err)
	}
	addr := listener.Addr().String()
	if err := listener.Close(); err != nil {
		t.Fatalf("close reserved listener: %v", err)
	}
	return addr
}

func recvSubmitRsp(t *testing.T, client *cmpp.Client) *cmpp.Cmpp3SubmitRspPkt {
	t.Helper()
	deadline := time.Now().Add(2 * time.Second)
	for time.Now().Before(deadline) {
		packet, err := client.RecvAndUnpackPkt(200 * time.Millisecond)
		if err != nil {
			continue
		}
		if rsp, ok := packet.(*cmpp.Cmpp3SubmitRspPkt); ok {
			return rsp
		}
	}
	t.Fatal("timed out waiting submit response")
	return nil
}