package admin

// Regression: admin create/link grid prechecks seeded the layout from the
// configured starting room. A detached in-progress area (not yet reachable
// from the start room) was therefore never laid out, so a link that introduced
// a grid twist was accepted, and auto-detecting a direction rejected two
// adjacent detached rooms as "not reachable from the seed room". The prechecks
// now seed from the room being edited.

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

	"thehouseoficarus/internal/config"
)

// newDetachedAdminServer builds a server whose configured starting room (999)
// is deliberately outside every room under test.
func newDetachedAdminServer(t *testing.T, rooms map[int]string) *AdminServer {
	t.Helper()
	s := newTestAdminServer(t, rooms)
	s.cfg = config.Default()
	s.cfg.StartingRoom = 999
	return s
}

func postLink(t *testing.T, s *AdminServer, body string) (map[string]any, int) {
	t.Helper()
	req := httptest.NewRequest(http.MethodPost, "/api/rooms/link", strings.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	rr := httptest.NewRecorder()
	s.handleRoomLink(rr, req)
	var resp map[string]any
	_ = json.Unmarshal(rr.Body.Bytes(), &resp)
	return resp, rr.Code
}

func TestLinkConflictDetectedInDetachedArea(t *testing.T) {
	s := newDetachedAdminServer(t, map[int]string{
		10: "id: 10\nname: A\nexits:\n  north:\n    room: 11\n",
		11: "id: 11\nname: B\nexits:\n  south:\n    room: 10\n  east:\n    room: 12\n",
		12: "id: 12\nname: C\n",
		// Starting room outside the component under edit.
		999: "id: 999\nname: Start\n",
	})

	// 10-e north->11 and 11-east->12 place 12 at (1,-1); adding 10-east->12
	// would also place it at (1,0) — a twist the detached precheck must catch.
	if resp, code := postLink(t, s, `{"from":10,"to":12,"dir":"east"}`); code != http.StatusConflict {
		t.Fatalf("detached link that creates a grid twist: status = %d (%v), want %d", code, resp, http.StatusConflict)
	}
}

func TestAutoDirectionWorksInDetachedArea(t *testing.T) {
	s := newDetachedAdminServer(t, map[int]string{
		10:  "id: 10\nname: A\nexits:\n  east:\n    room: 11\n",
		11:  "id: 11\nname: B\nexits:\n  west:\n    room: 10\n",
		999: "id: 999\nname: Start\n",
	})

	resp, code := postLink(t, s, `{"from":10,"to":11}`)
	if code != http.StatusOK {
		t.Fatalf("auto-direction in a detached area: status = %d (%v), want 200", code, resp)
	}
	if got := roomExitTarget(s, 10, "east"); got != 11 {
		t.Fatalf("room 10 east exit = %d, want 11", got)
	}
}