kandev/apps/backend/cmd/plugin-fixture/main_test.go

// Command plugin-fixture tests. Exercises fixturePlugin's Plugin methods
// (OnEvent, InvokeTool, HandleWebhook) via direct calls — no go-plugin
// spawn needed, since fixturePlugin has no dependency on the gRPC
// transport itself (pluginsdk.Serve owns that wiring and is covered by
// pkg/pluginsdk's own tests).
package main

import (
	"bufio"
	"bytes"
	"context"
	"encoding/json"
	"errors"
	"os"
	"path/filepath"
	"testing"

	"github.com/kandev/kandev/pkg/pluginsdk"
	"github.com/stretchr/testify/require"
)

var errBoom = errors.New("boom")

// readJSONLines reads path and decodes each non-empty line as T.
func readJSONLines[T any](t *testing.T, path string) []T {
	t.Helper()
	data, err := os.ReadFile(path)
	require.NoError(t, err)

	var out []T
	scanner := bufio.NewScanner(bytes.NewReader(data))
	for scanner.Scan() {
		line := scanner.Bytes()
		if len(bytes.TrimSpace(line)) == 0 {
			continue
		}
		var v T
		require.NoError(t, json.Unmarshal(line, &v))
		out = append(out, v)
	}
	require.NoError(t, scanner.Err())
	return out
}

func TestOnEvent_AppendsJSONLineToDataDir(t *testing.T) {
	dir := t.TempDir()
	p := &fixturePlugin{dataDir: dir}

	err := p.OnEvent(context.Background(), &pluginsdk.Event{
		EventID:   "evt_1",
		EventType: "task.created",
		Payload:   map[string]any{"task_id": "t1"},
	})
	require.NoError(t, err)

	recs := readJSONLines[deliveryRecord](t, filepath.Join(dir, "deliveries.jsonl"))
	require.Len(t, recs, 1)
	require.Equal(t, "task.created", recs[0].EventType)
	require.Equal(t, "evt_1", recs[0].EventID)
}

func TestOnEvent_AppendsMultipleDeliveriesInOrder(t *testing.T) {
	dir := t.TempDir()
	p := &fixturePlugin{dataDir: dir}

	require.NoError(t, p.OnEvent(context.Background(), &pluginsdk.Event{EventID: "e1", EventType: "task.created"}))
	require.NoError(t, p.OnEvent(context.Background(), &pluginsdk.Event{EventID: "e2", EventType: "task.updated"}))

	recs := readJSONLines[deliveryRecord](t, filepath.Join(dir, "deliveries.jsonl"))
	require.Len(t, recs, 2)
	require.Equal(t, "e1", recs[0].EventID)
	require.Equal(t, "e2", recs[1].EventID)
}

func TestOnEvent_CreatesDataDirIfMissing(t *testing.T) {
	dir := filepath.Join(t.TempDir(), "nested", "data")
	p := &fixturePlugin{dataDir: dir}

	err := p.OnEvent(context.Background(), &pluginsdk.Event{EventID: "e1", EventType: "task.created"})
	require.NoError(t, err)

	_, err = os.Stat(filepath.Join(dir, "deliveries.jsonl"))
	require.NoError(t, err)
}

func TestOnEvent_FirstEventCallsHostSetState(t *testing.T) {
	dir := t.TempDir()
	p := &fixturePlugin{dataDir: dir}
	host := &fakeHost{}
	p.SetHost(host)

	require.NoError(t, p.OnEvent(context.Background(), &pluginsdk.Event{EventID: "e1", EventType: "task.created"}))
	require.NoError(t, p.OnEvent(context.Background(), &pluginsdk.Event{EventID: "e2", EventType: "task.updated"}))

	require.Len(t, host.setStateCalls, 1, "SetState should only be exercised on the first event")
	call := host.setStateCalls[0]
	require.Equal(t, "instance", call.scope)
	require.Equal(t, "", call.scopeID)
	require.Equal(t, "last_event", call.key)
	require.Equal(t, "e1", call.value["event_id"])
}

func TestOnEvent_IgnoresHostSetStateError(t *testing.T) {
	dir := t.TempDir()
	p := &fixturePlugin{dataDir: dir}
	host := &fakeHost{setStateErr: errBoom}
	p.SetHost(host)

	err := p.OnEvent(context.Background(), &pluginsdk.Event{EventID: "e1", EventType: "task.created"})
	require.NoError(t, err, "Host.SetState failures must be best-effort and not fail OnEvent")
}

func TestInvokeTool_EchoReturnsInput(t *testing.T) {
	p := &fixturePlugin{dataDir: t.TempDir()}

	input := map[string]any{"channel": "#dev", "text": "hi"}
	resp, err := p.InvokeTool(context.Background(), &pluginsdk.ToolRequest{
		ToolName: "echo",
		Input:    input,
	})
	require.NoError(t, err)
	require.Equal(t, input, resp.Output)
}

func TestHandleWebhook_AppendsJSONLineAndRespondsOK(t *testing.T) {
	dir := t.TempDir()
	p := &fixturePlugin{dataDir: dir}

	resp, err := p.HandleWebhook(context.Background(), &pluginsdk.WebhookRequest{
		WebhookKey: "test-hook",
		Method:     "POST",
		Body:       []byte(`{"ping":true}`),
	})
	require.NoError(t, err)
	require.Equal(t, int32(200), resp.Status)
	require.Equal(t, "ok", string(resp.Body))

	recs := readJSONLines[webhookRecord](t, filepath.Join(dir, "webhooks.jsonl"))
	require.Len(t, recs, 1)
	require.Equal(t, "test-hook", recs[0].WebhookKey)
}

func TestResolveDataDir_UsesEnvWhenSet(t *testing.T) {
	t.Setenv("KANDEV_PLUGIN_DATA_DIR", "/tmp/kandev-plugin-e2e-data")
	require.Equal(t, "/tmp/kandev-plugin-e2e-data", resolveDataDir())
}

func TestResolveDataDir_FallsBackToCwdWhenUnset(t *testing.T) {
	t.Setenv("KANDEV_PLUGIN_DATA_DIR", "")
	wd, err := os.Getwd()
	require.NoError(t, err)
	require.Equal(t, wd, resolveDataDir())
}

// setStateCall records one fakeHost.SetState invocation.
type setStateCall struct {
	scope, scopeID, key string
	value               map[string]any
}

// fakeHost is a minimal pluginsdk.Host test double that only records
// SetState calls; the fixture plugin never exercises the other methods.
type fakeHost struct {
	setStateCalls []setStateCall
	setStateErr   error
}

func (h *fakeHost) GetState(context.Context, string, string, string) (map[string]any, bool, error) {
	return nil, false, nil
}

func (h *fakeHost) SetState(_ context.Context, scope, scopeID, key string, value map[string]any) error {
	h.setStateCalls = append(h.setStateCalls, setStateCall{scope: scope, scopeID: scopeID, key: key, value: value})
	return h.setStateErr
}

func (h *fakeHost) DeleteState(context.Context, string, string, string) error { return nil }

func (h *fakeHost) ListState(context.Context, string, string) ([]pluginsdk.StateEntry, error) {
	return nil, nil
}

func (h *fakeHost) RevealSecret(context.Context, string) (string, error) { return "", nil }

func (h *fakeHost) EmitEvent(context.Context, string, map[string]any) error { return nil }

var _ pluginsdk.Host = (*fakeHost)(nil)