feat: split the concept of hidden and impassable exits. add player_flag for discovered hidden exits.

4 files changed, 49 insertions, 33 deletions

diff --git a/internal/admin/api_map.go b/internal/admin/api_map.go
index 5168165..a7802f9 100644
--- a/internal/admin/api_map.go
+++ b/internal/admin/api_map.go
@@ -50,7 +50,7 @@ func (s *AdminServer) handleMap(w http.ResponseWriter, r *http.Request) {
 			return nil, false
 		}
 		return room, true
-	}, nil, func(gc world.GridConflict) {
+	}, nil, nil, func(gc world.GridConflict) {
 		if gc.Kind == "overlap" {
 			log.Printf("map: grid overlap: room %d wants cell %v already held by %d (via %d->%s)",
 				gc.Target, gc.Want, gc.Occupier, gc.From, gc.Dir)
@@ -171,6 +171,7 @@ func (s *AdminServer) handleMap(w http.ResponseWriter, r *http.Request) {
 		Dir           string `json:"dir"`
 		Bidirectional bool   `json:"bidirectional"`
 		Hidden        bool   `json:"hidden"`
+		AlwaysBlocked bool   `json:"always_blocked"`
 	}
 
 	type UDLink struct {
@@ -260,7 +261,7 @@ func (s *AdminServer) handleMap(w http.ResponseWriter, r *http.Request) {
 
 		bidirectional := false
 		if targetRoom, ok := roomData[target]; ok {
-			if oppExit, ok := targetRoom.Exits[world.OppositeExit[dir]]; ok && oppExit.Room == rid && !oppExit.Hidden {
+			if oppExit, ok := targetRoom.Exits[world.OppositeExit[dir]]; ok && oppExit.Room == rid && !oppExit.Hidden && !oppExit.AlwaysBlocked {
 				bidirectional = true
 			}
 		}
@@ -277,6 +278,7 @@ func (s *AdminServer) handleMap(w http.ResponseWriter, r *http.Request) {
 			Dir:           string(dir),
 			Bidirectional: bidirectional,
 			Hidden:        exit.Hidden,
+			AlwaysBlocked: exit.AlwaysBlocked,
 		})
 		}
 	}
diff --git a/internal/admin/api_room_courses.go b/internal/admin/api_room_courses.go
index f81a204..86c7cdf 100644
--- a/internal/admin/api_room_courses.go
+++ b/internal/admin/api_room_courses.go
@@ -378,8 +378,8 @@ func (s *AdminServer) handleRoomAttachCourse(w http.ResponseWriter, r *http.Requ
 		NewContent:  newContent,
 	})
 
-	// --- hidden exit management ---
-	// Create hidden exits so the map BFS lays the course rooms in sequence.
+	// --- course map exit management ---
+	// Create always-blocked exits so the map BFS lays the course rooms in sequence.
 	var prevRoom, nextRoom int
 	if insertAt > 0 {
 		prevRoom = obstacleRoomID(newList[insertAt-1])
@@ -391,24 +391,24 @@ func (s *AdminServer) handleRoomAttachCourse(w http.ResponseWriter, r *http.Requ
 	if prevRoom > 0 {
 		pm, _, _, perr := s.loadRoomMapByID(prevRoom)
 		if perr == nil {
-			// Delete the old hidden link from prevRoom to nextRoom (now bypassed).
+			// Delete the old blocked link from prevRoom to nextRoom (now bypassed).
 			if nextRoom > 0 {
-				oldDir := findHiddenExitDirToTarget(pm, nextRoom)
+				oldDir := findCourseExitDirToTarget(pm, nextRoom)
 				if oldDir != "" {
 					removeExit(pm, oldDir)
 				}
 			}
 			dir := ensureValidDirection(body.Direction, pm)
-			setHiddenExit(pm, dir, roomID)
-			s.saveRoomMapByID(prevRoom, pm, fmt.Sprintf("hidden exit %d->%d for course %s", prevRoom, roomID, body.CourseID))
+			setCourseBlockedExit(pm, dir, roomID)
+			s.saveRoomMapByID(prevRoom, pm, fmt.Sprintf("blocked exit %d->%d for course %s", prevRoom, roomID, body.CourseID))
 		}
 	}
 	if nextRoom > 0 {
 		cm, _, _, cerr := s.loadRoomMapByID(roomID)
 		if cerr == nil {
 			dir := autoPickDirection(cm)
-			setHiddenExit(cm, dir, nextRoom)
-			s.saveRoomMapByID(roomID, cm, fmt.Sprintf("hidden exit %d->%d for course %s", roomID, nextRoom, body.CourseID))
+			setCourseBlockedExit(cm, dir, nextRoom)
+			s.saveRoomMapByID(roomID, cm, fmt.Sprintf("blocked exit %d->%d for course %s", roomID, nextRoom, body.CourseID))
 		}
 	}
 
@@ -448,25 +448,25 @@ func (s *AdminServer) handleRoomDetachCourse(w http.ResponseWriter, r *http.Requ
 			nextRoom = obstacleRoomID(obstacles[idx+1])
 		}
 
-		// --- hidden exit cleanup ---
+		// --- course map exit cleanup ---
 		var relinkDir string
 		if prevRoom > 0 {
 			pm, _, _, perr := s.loadRoomMapByID(prevRoom)
 			if perr == nil {
-				relinkDir = findHiddenExitDirToTarget(pm, roomID)
+				relinkDir = findCourseExitDirToTarget(pm, roomID)
 				if relinkDir != "" {
 					removeExit(pm, relinkDir)
-					s.saveRoomMapByID(prevRoom, pm, fmt.Sprintf("remove hidden exit to %d (course %s)", roomID, id))
+					s.saveRoomMapByID(prevRoom, pm, fmt.Sprintf("remove blocked exit to %d (course %s)", roomID, id))
 				}
 			}
 		}
 		if nextRoom > 0 {
 			cm, _, _, cerr := s.loadRoomMapByID(roomID)
 			if cerr == nil {
-				d := findHiddenExitDirToTarget(cm, nextRoom)
+				d := findCourseExitDirToTarget(cm, nextRoom)
 				if d != "" {
 					removeExit(cm, d)
-					s.saveRoomMapByID(roomID, cm, fmt.Sprintf("remove hidden exit to %d (course %s)", nextRoom, id))
+					s.saveRoomMapByID(roomID, cm, fmt.Sprintf("remove blocked exit to %d (course %s)", nextRoom, id))
 				}
 			}
 		}
@@ -475,8 +475,8 @@ func (s *AdminServer) handleRoomDetachCourse(w http.ResponseWriter, r *http.Requ
 			pm, _, _, perr := s.loadRoomMapByID(prevRoom)
 			if perr == nil {
 				dir := ensureValidDirection(relinkDir, pm)
-				setHiddenExit(pm, dir, nextRoom)
-				s.saveRoomMapByID(prevRoom, pm, fmt.Sprintf("relink hidden exit %d->%d (course %s)", prevRoom, nextRoom, id))
+				setCourseBlockedExit(pm, dir, nextRoom)
+				s.saveRoomMapByID(prevRoom, pm, fmt.Sprintf("relink blocked exit %d->%d (course %s)", prevRoom, nextRoom, id))
 			}
 		}
 
@@ -573,11 +573,12 @@ func roomExitsMap(m map[string]any) map[string]any {
 	return ex
 }
 
-// setHiddenExit adds or replaces a hidden exit in direction dir targeting
-// targetRoomID.
-func setHiddenExit(m map[string]any, dir string, targetRoomID int) {
+// setCourseBlockedExit adds or replaces an always-blocked exit in direction dir
+// targeting targetRoomID. Always-blocked exits are impassable but render on the map;
+// used to lay out course rooms in visual sequence.
+func setCourseBlockedExit(m map[string]any, dir string, targetRoomID int) {
 	ex := roomExitsMap(m)
-	ex[dir] = map[string]any{"room": targetRoomID, "hidden": true}
+	ex[dir] = map[string]any{"room": targetRoomID, "always_blocked": true}
 }
 
 // removeExit deletes an exit by direction. Returns true if it existed.
@@ -608,25 +609,25 @@ func exitTargetRoom(v any) int {
 	return 0
 }
 
-// exitIsHidden returns whether an exit value carries hidden: true.
-func exitIsHidden(v any) bool {
+// exitIsAlwaysBlocked returns whether an exit value carries always_blocked: true.
+func exitIsAlwaysBlocked(v any) bool {
 	if mm, ok := v.(map[string]any); ok {
-		if h, ok := mm["hidden"]; ok {
+		if h, ok := mm["always_blocked"]; ok {
 			return h == true
 		}
 	}
 	return false
 }
 
-// findHiddenExitDirToTarget returns the direction of a hidden exit from m
+// findCourseExitDirToTarget returns the direction of an always-blocked exit from m
 // targeting targetRoomID, or "" if none.
-func findHiddenExitDirToTarget(m map[string]any, targetRoomID int) string {
+func findCourseExitDirToTarget(m map[string]any, targetRoomID int) string {
 	ex, ok := m["exits"].(map[string]any)
 	if !ok {
 		return ""
 	}
 	for dir, v := range ex {
-		if exitIsHidden(v) && exitTargetRoom(v) == targetRoomID {
+		if exitIsAlwaysBlocked(v) && exitTargetRoom(v) == targetRoomID {
 			return dir
 		}
 	}
diff --git a/internal/admin/api_rooms.go b/internal/admin/api_rooms.go
index 74143a8..75f4779 100644
--- a/internal/admin/api_rooms.go
+++ b/internal/admin/api_rooms.go
@@ -458,7 +458,7 @@ func (s *AdminServer) handleRoomLink(w http.ResponseWriter, r *http.Request) {
 					return nil, false
 				}
 				return room, true
-			}, nil, nil)
+			}, nil, nil, nil)
 
 			cA, okA := grid.Coord[body.From]
 			cB, okB := grid.Coord[body.To]
@@ -542,7 +542,7 @@ func (s *AdminServer) handleRoomLink(w http.ResponseWriter, r *http.Request) {
 				roomCopy.Exits[oppDir] = world.ExitDef{Room: body.From}
 			}
 			return &roomCopy, true
-		}, nil, func(gc world.GridConflict) {
+		}, nil, nil, func(gc world.GridConflict) {
 			conflicts++
 		})
 		_ = testGrid
diff --git a/internal/admin/static/map.js b/internal/admin/static/map.js
index 0dab98c..8080451 100644
--- a/internal/admin/static/map.js
+++ b/internal/admin/static/map.js
@@ -253,10 +253,12 @@ function renderMap(data) {
       if (!fr || !tr) return;
       var x1 = fr.x * CELL + CELL/2, y1 = fr.y * CELL + CELL/2;
       var x2 = tr.x * CELL + CELL/2, y2 = tr.y * CELL + CELL/2;
+      if (l.always_blocked) {
+        g += '<line x1="'+x1+'" y1="'+y1+'" x2="'+x2+'" y2="'+y2+'" stroke="#C44" stroke-width="5" opacity="0.75" stroke-dasharray="6,3" vector-effect="non-scaling-stroke"/>';
+        return;
+      }
       if (l.hidden) {
-        // Hidden course-link exit: distinct color (map_course, ~#1B6FC0) and
-        // tighter dashed arrow style.
-        g += '<line x1="'+x1+'" y1="'+y1+'" x2="'+x2+'" y2="'+y2+'" stroke="#1B6FC0" stroke-width="5" opacity="0.75" stroke-dasharray="2,2" vector-effect="non-scaling-stroke"/>';
+        g += '<line x1="'+x1+'" y1="'+y1+'" x2="'+x2+'" y2="'+y2+'" stroke="#C7C" stroke-width="5" opacity="0.7" stroke-dasharray="2,2" vector-effect="non-scaling-stroke"/>';
         return;
       }
       var c = blendColors(fr.color, tr.color).replace('#','');
@@ -1232,15 +1234,18 @@ function renderExitsSection(r) {
     var setFlags = (typeof exit === 'object' && exit.set_flags) ? exit.set_flags : null;
     var setPlayerFlags = (typeof exit === 'object' && exit.set_player_flags) ? exit.set_player_flags : null;
     var hidden = (typeof exit === 'object' && exit.hidden) ? exit.hidden : false;
-    var isConditional = !!(cond || bmsg || setFlags || setPlayerFlags || hidden);
+    var alwaysBlocked = (typeof exit === 'object' && exit.always_blocked) ? exit.always_blocked : false;
+    var isConditional = !!(cond || bmsg || setFlags || setPlayerFlags || hidden || alwaysBlocked);
     var isBidi = mapData && mapData.links && mapData.links.some(function(l) {
       return l.bidirectional && ((l.from === r.id && l.to === target) || (l.from === target && l.to === r.id));
     });
     h += '<div class="exit-row" data-dir="' + d + '">';
     h += '<span class="exit-dir"' + (isConditional ? ' style="color:#f55"' : '') + '>' + d + '</span>';
     h += '<span class="exit-target" onclick="selectRoom(' + target + ')"># ' + target + '</span>';
+    if (alwaysBlocked) h += '<span class="exit-meta">Impassable</span>';
     if (bmsg) h += '<span class="exit-meta">Blocked: ' + esc(bmsg) + '</span>';
     if (cond) h += '<span class="exit-meta">Conditional</span>';
+    if (hidden) h += '<span class="exit-meta" style="color:#c7c">Hidden</span>';
     h += '<button class="btn btn-sm" onclick="editExitCondition(\'' + d + '\')">Edit</button>';
     if (isBidi) h += '<button class="btn btn-sm" onclick="deleteLink(' + target + ',' + r.id + ',\'from\')" title="Remove reverse exit to make one-way">\u21C6</button>';
     h += '<button class="btn btn-sm btn-danger" onclick="deleteExit(\'' + d + '\', ' + target + ')">X</button>';
@@ -1271,6 +1276,7 @@ function editExitCondition(dir) {
   var setFlags = exit.set_flags || null;
   var setPlayerFlags = exit.set_player_flags || null;
   var hidden = exit.hidden || false;
+  var alwaysBlocked = exit.always_blocked || false;
 
   var flagsStr = '';
   if (setFlags) flagsStr = Object.keys(setFlags).map(function(k) { return k + '=' + setFlags[k]; }).join(', ');
@@ -1290,6 +1296,7 @@ function editExitCondition(dir) {
   h += '<div class="form-group"><label>Set Player Flags (key=value, comma separated)</label><input id="exitPFlags" value="' + escAttr(pflagsStr) + '"></div>';
   h += '<div class="form-group"><label>Blocked Message</label><textarea id="exitBmsg" rows="2">' + esc(bmsg) + '</textarea></div>';
   h += '<div class="form-group"><label><input type="checkbox" id="exitHidden"' + (hidden ? ' checked' : '') + '> Hidden</label></div>';
+  h += '<div class="form-group"><label><input type="checkbox" id="exitAlwaysBlocked"' + (alwaysBlocked ? ' checked' : '') + '> Always Blocked (impassable, shown on map)</label></div>';
 
   h += '<div style="margin-top:10px;border-top:1px solid var(--border);padding-top:8px">';
   h += '<label style="font-size:11px;color:#aaa;text-transform:uppercase;letter-spacing:.5px">Conditions</label>';
@@ -1429,6 +1436,8 @@ function saveExitCondition() {
   exit.blocked_message = (bmsg && bmsg.value) ? bmsg.value : '';
   var hiddenEl = document.getElementById('exitHidden');
   exit.hidden = hiddenEl ? hiddenEl.checked : false;
+  var alwaysBlockedEl = document.getElementById('exitAlwaysBlocked');
+  exit.always_blocked = alwaysBlockedEl ? alwaysBlockedEl.checked : false;
   var flagsStr = document.getElementById('exitFlags');
   var pflagsStr = document.getElementById('exitPFlags');
   exit.set_flags = parseFlagInput(flagsStr ? flagsStr.value : '');
@@ -1475,6 +1484,10 @@ function clearExitCondition() {
   if (ef) ef.value = '';
   var pf = document.getElementById('exitPFlags');
   if (pf) pf.value = '';
+  var hx = document.getElementById('exitHidden');
+  if (hx) hx.checked = false;
+  var ab = document.getElementById('exitAlwaysBlocked');
+  if (ab) ab.checked = false;
 }
 
 function parseFlagInput(val) {