package web

import (
	"encoding/json"
	"path/filepath"
	"testing"

	"github.com/yuanyuanxiang/SimpleRemoter/server/go/connection"
	"github.com/yuanyuanxiang/SimpleRemoter/server/go/devicehistory"
	"github.com/yuanyuanxiang/SimpleRemoter/server/go/hub"
	"github.com/yuanyuanxiang/SimpleRemoter/server/go/logger"
	"github.com/yuanyuanxiang/SimpleRemoter/server/go/protocol"
	"github.com/yuanyuanxiang/SimpleRemoter/server/go/wsauth"
)

// deleteTestHub builds the minimal wsHub wiring handleDeleteDevice needs.
func deleteTestHub(t *testing.T) (*wsHub, *hub.Hub, *devicehistory.Store) {
	t.Helper()
	h := hub.New()
	hist, err := devicehistory.Open(filepath.Join(t.TempDir(), "devices.json"), 100, nil)
	if err != nil {
		t.Fatalf("Open history: %v", err)
	}
	t.Cleanup(func() { _ = hist.Close() })
	h.Subscribe(hist)

	auth := wsauth.New()
	wh := &wsHub{
		auth:    auth,
		devices: h,
		history: hist,
		log:     logger.New(logger.Config{}),
		clients: make(map[*wsClient]struct{}),
	}
	return wh, h, hist
}

func deleteTestClient(wh *wsHub, role string) (*wsClient, string) {
	tok, err := wh.auth.IssueToken("tester", role)
	if err != nil {
		panic(err)
	}
	c := &wsClient{send: make(chan wsMsg, 8), closed: make(chan struct{})}
	wh.register(c)
	return c, tok
}

func deleteReply(t *testing.T, c *wsClient) map[string]any {
	t.Helper()
	for {
		select {
		case m := <-c.send:
			var out map[string]any
			if err := json.Unmarshal(m.data, &out); err != nil {
				t.Fatalf("decode reply: %v", err)
			}
			if out["cmd"] == "delete_device_result" {
				return out
			}
		default:
			t.Fatal("no delete_device_result reply")
			return nil
		}
	}
}

func TestDeleteDeviceOfflineRemovesHistoryRecord(t *testing.T) {
	wh, h, hist := deleteTestHub(t)
	h.Register(&hub.Device{ID: "gone", Name: "Gone"},
		&connection.Context{RemoteAddr: "10.0.0.1:1000"})
	h.Unregister("gone")

	c, tok := deleteTestClient(wh, "admin")
	raw, _ := json.Marshal(map[string]any{"token": tok, "id": "gone"})
	wh.handleDeleteDevice(c, raw)

	rep := deleteReply(t, c)
	if rep["ok"] != true || rep["mode"] != "removed" {
		t.Fatalf("reply = %+v, want ok/removed", rep)
	}
	if hist.Remove("gone") {
		t.Fatal("history record still present after delete")
	}
}

func TestDeleteDeviceOnlineSendsUninstall(t *testing.T) {
	wh, h, hist := deleteTestHub(t)
	var sent []byte
	h.SetSender(func(_ *connection.Context, data []byte) error {
		sent = append([]byte(nil), data...)
		return nil
	})
	h.Register(&hub.Device{ID: "live", Name: "Live"},
		&connection.Context{RemoteAddr: "10.0.0.2:1000"})

	c, tok := deleteTestClient(wh, "admin")
	raw, _ := json.Marshal(map[string]any{"token": tok, "id": "live"})
	wh.handleDeleteDevice(c, raw)

	rep := deleteReply(t, c)
	if rep["ok"] != true || rep["mode"] != "uninstall" {
		t.Fatalf("reply = %+v, want ok/uninstall", rep)
	}
	if len(sent) != 1 || sent[0] != protocol.CommandUninstall {
		t.Fatalf("sent = %v, want single %d byte", sent, protocol.CommandUninstall)
	}
	// The history record is dropped along with the uninstall, so the device
	// does not reappear as a dead offline entry after it disconnects.
	if hist.Remove("live") {
		t.Fatal("online device's history record survived the uninstall")
	}
}

func TestDeleteDeviceRequiresAdmin(t *testing.T) {
	wh, h, hist := deleteTestHub(t)
	h.Register(&hub.Device{ID: "gone", Name: "Gone"},
		&connection.Context{RemoteAddr: "10.0.0.3:1000"})
	h.Unregister("gone")

	c, tok := deleteTestClient(wh, "viewer")
	raw, _ := json.Marshal(map[string]any{"token": tok, "id": "gone"})
	wh.handleDeleteDevice(c, raw)

	rep := deleteReply(t, c)
	if rep["ok"] != false {
		t.Fatalf("reply = %+v, want ok:false", rep)
	}
	if !hist.Remove("gone") {
		t.Fatal("viewer delete removed the history record")
	}
}