package main

import (
	"bytes"
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/go-chi/chi/v5"

	"git.agentview.dev/profit/golangLAKEHOUSE/internal/observer"
	"git.agentview.dev/profit/golangLAKEHOUSE/internal/workflow"
)

// newTestRouter builds the observerd router with an in-memory store
// and a workflow runner with no modes registered. Closes R-005 for
// observerd.
func newTestRouter(t *testing.T) http.Handler {
	t.Helper()
	h := &handlers{
		store:  observer.NewStore(nil),
		runner: workflow.NewRunner(),
	}
	r := chi.NewRouter()
	h.register(r)
	return r
}

func TestRoutesMounted(t *testing.T) {
	r := newTestRouter(t)
	want := map[string]bool{
		"GET /observer/stats":           false,
		"POST /observer/event":          false,
		"POST /observer/workflow/run":   false,
		"GET /observer/workflow/modes":  false,
	}
	router := r.(chi.Router)
	_ = chi.Walk(router, func(method, route string, _ http.Handler, _ ...func(http.Handler) http.Handler) error {
		key := method + " " + route
		if _, ok := want[key]; ok {
			want[key] = true
		}
		return nil
	})
	for k, mounted := range want {
		if !mounted {
			t.Errorf("route not mounted: %s", k)
		}
	}
}

func TestStats_GET(t *testing.T) {
	r := newTestRouter(t)
	req := httptest.NewRequest("GET", "/observer/stats", nil)
	w := httptest.NewRecorder()
	r.ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Errorf("expected 200, got %d", w.Code)
	}
}

func TestWorkflowModes_GET(t *testing.T) {
	r := newTestRouter(t)
	req := httptest.NewRequest("GET", "/observer/workflow/modes", nil)
	w := httptest.NewRecorder()
	r.ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Errorf("expected 200, got %d", w.Code)
	}
}

// TestEvent_InvalidOp locks the validation path: an ObservedOp with
// missing required fields must 400, not 500. Without this assertion,
// observer.ErrInvalidOp could silently slip into the 500 branch on a
// future refactor and clients would see "internal" instead of the
// actual validation error.
func TestEvent_InvalidOp(t *testing.T) {
	r := newTestRouter(t)
	// Empty body — no endpoint, no source — fails ObservedOp validation.
	body := []byte(`{}`)
	req := httptest.NewRequest("POST", "/observer/event", bytes.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	w := httptest.NewRecorder()
	r.ServeHTTP(w, req)
	if w.Code != http.StatusBadRequest {
		t.Errorf("expected 400 on invalid op, got %d (body=%s)", w.Code, w.Body.String())
	}
}

// TestWorkflowRun_UnknownMode locks the 400 path on workflow definitions
// that reference modes not registered with the runner. The harness's
// reality test runs depend on this so an unknown-mode misconfiguration
// surfaces as a definition error, not a server error.
func TestWorkflowRun_UnknownMode(t *testing.T) {
	r := newTestRouter(t)
	body := []byte(`{"workflow":{"name":"t","nodes":[{"id":"n1","mode":"does.not.exist"}]}}`)
	req := httptest.NewRequest("POST", "/observer/workflow/run", bytes.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	w := httptest.NewRecorder()
	r.ServeHTTP(w, req)
	if w.Code != http.StatusBadRequest {
		t.Errorf("expected 400 on unknown mode, got %d (body=%s)", w.Code, w.Body.String())
	}
}