package api

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

	"github.com/gorilla/websocket"
)

// TestComplete_ErrorIsJSONString ensures task_complete encodes the failure
// reason as a string. Marshaling a Go error interface produces {}, which the
// manager cannot unmarshal into WSTaskUpdate.Error and used to look like a
// silent WebSocket drop with no retries.
func TestComplete_ErrorIsJSONString(t *testing.T) {
	upgrader := websocket.Upgrader{}
	received := make(chan map[string]interface{}, 1)

	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		conn, err := upgrader.Upgrade(w, r, nil)
		if err != nil {
			return
		}
		defer conn.Close()

		// auth handshake
		var auth map[string]interface{}
		if err := conn.ReadJSON(&auth); err != nil {
			return
		}
		if auth["type"] == "auth" {
			_ = conn.WriteJSON(map[string]string{"type": "auth_ok"})
		}

		var msg map[string]interface{}
		if err := conn.ReadJSON(&msg); err != nil {
			return
		}
		received <- msg
	}))
	defer server.Close()

	jc := NewJobConnection()
	if err := jc.Connect(server.URL, "/job/1", "token123"); err != nil {
		t.Fatalf("Connect failed: %v", err)
	}
	defer jc.Close()

	jc.Complete(42, false, errors.New("blender failed: signal: segmentation fault (core dumped)"), true)

	select {
	case msg := <-received:
		if msg["type"] != "task_complete" {
			t.Fatalf("type = %v, want task_complete", msg["type"])
		}
		data, ok := msg["data"].(map[string]interface{})
		if !ok {
			// gorilla may leave nested objects as map[string]interface{} after JSON round-trip;
			// also accept raw re-marshal path
			raw, _ := json.Marshal(msg["data"])
			data = map[string]interface{}{}
			if err := json.Unmarshal(raw, &data); err != nil {
				t.Fatalf("data type %T: %v", msg["data"], err)
			}
		}
		errVal, ok := data["error"].(string)
		if !ok {
			t.Fatalf("error field type %T value %#v; want string (not object)", data["error"], data["error"])
		}
		if errVal != "blender failed: signal: segmentation fault (core dumped)" {
			t.Fatalf("error = %q, want segfault message", errVal)
		}
		if data["success"] != false {
			t.Fatalf("success = %v, want false", data["success"])
		}
		if data["free_requeue"] != true {
			t.Fatalf("free_requeue = %v, want true", data["free_requeue"])
		}
	case <-time.After(2 * time.Second):
		t.Fatal("timed out waiting for task_complete message")
	}
}

func TestJobConnection_ConnectAndClose(t *testing.T) {
	upgrader := websocket.Upgrader{}
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		conn, err := upgrader.Upgrade(w, r, nil)
		if err != nil {
			return
		}
		defer conn.Close()

		var msg map[string]interface{}
		if err := conn.ReadJSON(&msg); err != nil {
			return
		}
		if msg["type"] == "auth" {
			_ = conn.WriteJSON(map[string]string{"type": "auth_ok"})
		}
		// Keep open briefly so client can mark connected.
		time.Sleep(100 * time.Millisecond)
	}))
	defer server.Close()

	jc := NewJobConnection()
	managerURL := strings.Replace(server.URL, "http://", "http://", 1)
	if err := jc.Connect(managerURL, "/job/1", "token123"); err != nil {
		t.Fatalf("Connect failed: %v", err)
	}
	if !jc.IsConnected() {
		t.Fatal("expected connection to be marked connected")
	}
	jc.Close()
}