package web

import (
	"net/http"
	"net/http/httptest"
	"path/filepath"
	"strings"
	"testing"

	"antidrift/internal/domain"
	"antidrift/internal/session"

	"github.com/gin-gonic/gin"
)

func newTestServer(t *testing.T) *Server {
	t.Helper()
	gin.SetMode(gin.TestMode)
	path := filepath.Join(t.TempDir(), "state.json")
	ctrl, err := session.New(path)
	if err != nil {
		t.Fatalf("controller: %v", err)
	}
	return NewServer(ctrl)
}

func post(t *testing.T, r http.Handler, path, body string) *httptest.ResponseRecorder {
	t.Helper()
	req := httptest.NewRequest(http.MethodPost, path, strings.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	w := httptest.NewRecorder()
	r.ServeHTTP(w, req)
	return w
}

func TestPlanningThenCommitmentReachesActive(t *testing.T) {
	s := newTestServer(t)
	r := s.Router()

	if w := post(t, r, "/planning", ""); w.Code != http.StatusOK {
		t.Fatalf("/planning code %d", w.Code)
	}
	body := `{"next_action":"Build web","success_condition":"web tests pass","timebox_secs":1500}`
	if w := post(t, r, "/commitment", body); w.Code != http.StatusOK {
		t.Fatalf("/commitment code %d body %s", w.Code, w.Body.String())
	}
	if s.ctrl.State().RuntimeState != domain.RuntimeActive {
		t.Fatalf("expected Active, got %s", s.ctrl.State().RuntimeState)
	}
}

func TestCommitmentRejectsInvalidInput(t *testing.T) {
	s := newTestServer(t)
	r := s.Router()
	_ = post(t, r, "/planning", "")
	body := `{"next_action":"","success_condition":"x","timebox_secs":1500}`
	w := post(t, r, "/commitment", body)
	if w.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d", w.Code)
	}
}

func TestIllegalTransitionReturns409(t *testing.T) {
	s := newTestServer(t)
	r := s.Router()
	// /complete from Locked is illegal.
	w := post(t, r, "/complete", "")
	if w.Code != http.StatusConflict {
		t.Fatalf("expected 409, got %d", w.Code)
	}
}