mode manager finally

client/src/modes/handlers/mode_manager.rs

@@ -0,0 +1,50 @@
+// src/modes/handlers/mode_manager.rs
+use crate::state::state::AppState;
+use crate::modes::handlers::event::EventHandler;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum AppMode {
+    General,   // For intro and admin screens
+    ReadOnly,  // Canvas read-only mode
+    Edit,      // Canvas edit mode
+    Command,   // Command mode overlay
+}
+
+pub struct ModeManager;
+
+impl ModeManager {
+    // Determine current mode based on app state
+    pub fn derive_mode(app_state: &AppState, event_handler: &EventHandler) -> AppMode {
+        // Command mode takes precedence if active
+        if event_handler.command_mode {
+            return AppMode::Command;
+        }
+
+        // Check UI state flags
+        if app_state.ui.show_intro || app_state.ui.show_admin {
+            AppMode::General
+        } else if app_state.ui.show_form {
+            if event_handler.is_edit_mode {
+                AppMode::Edit
+            } else {
+                AppMode::ReadOnly
+            }
+        } else {
+            // Fallback
+            AppMode::General
+        }
+    }
+    
+    // Mode transition rules
+    pub fn can_enter_command_mode(current_mode: AppMode) -> bool {
+        !matches!(current_mode, AppMode::Edit)  // Can't enter from Edit mode
+    }
+    
+    pub fn can_enter_edit_mode(current_mode: AppMode) -> bool {
+        matches!(current_mode, AppMode::ReadOnly)  // Only from ReadOnly
+    }
+    
+    pub fn can_enter_read_only_mode(current_mode: AppMode) -> bool {
+        matches!(current_mode, AppMode::Edit | AppMode::Command)
+    }
+}