buffer as a feature

client/src/buffer/state.rs

@@ -0,0 +1,119 @@
+// src/buffer/state/buffer.rs
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum AppView {
+    Intro,
+    Login,
+    Register,
+    Admin,
+    AddTable,
+    AddLogic,
+    Form,
+    Scratch,
+}
+
+impl AppView {
+    /// Returns the display name for the view.
+    /// For Form, pass the current table name to get dynamic naming.
+    pub fn display_name(&self) -> &str {
+        match self {
+            AppView::Intro => "Intro",
+            AppView::Login => "Login",
+            AppView::Register => "Register",
+            AppView::Admin => "Admin_Panel",
+            AppView::AddTable => "Add_Table",
+            AppView::AddLogic => "Add_Logic",
+            AppView::Form => "Form",
+            AppView::Scratch => "*scratch*",
+        }
+    }
+
+    /// Returns the display name with dynamic context (for Form buffers)
+    pub fn display_name_with_context(&self, current_table_name: Option<&str>) -> String {
+        match self {
+            AppView::Form => {
+                current_table_name
+                    .unwrap_or("Data Form")
+                    .to_string()
+            }
+            _ => self.display_name().to_string(),
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct BufferState {
+    pub history: Vec<AppView>,
+    pub active_index: usize,
+}
+
+impl Default for BufferState {
+    fn default() -> Self {
+        Self {
+            history: vec![AppView::Intro],
+            active_index: 0,
+        }
+    }
+}
+
+impl BufferState {
+    pub fn update_history(&mut self, view: AppView) {
+        let existing_pos = self.history.iter().position(|v| v == &view);
+        match existing_pos {
+            Some(pos) => self.active_index = pos,
+            None => {
+                self.history.push(view.clone());
+                self.active_index = self.history.len() - 1;
+            }
+        }
+    }
+
+    pub fn get_active_view(&self) -> Option<&AppView> {
+        self.history.get(self.active_index)
+    }
+
+    pub fn close_active_buffer(&mut self) -> bool {
+        if self.history.is_empty() {
+            self.history.push(AppView::Intro);
+            self.active_index = 0;
+            return false;
+        }
+
+        let current_index = self.active_index;
+        self.history.remove(current_index);
+
+        if self.history.is_empty() {
+            self.history.push(AppView::Intro);
+            self.active_index = 0;
+        } else if self.active_index >= self.history.len() {
+            self.active_index = self.history.len() - 1;
+        }
+        true
+    }
+
+    pub fn close_buffer_with_intro_fallback(&mut self, current_table_name: Option<&str>) -> String {
+        let current_view_cloned = self.get_active_view().cloned();
+
+        if let Some(AppView::Intro) = current_view_cloned {
+            if self.history.len() == 1 {
+                self.close_active_buffer();
+                return "Intro buffer reset".to_string();
+            }
+        }
+
+        let closed_name = current_view_cloned
+            .as_ref()
+            .map(|v| v.display_name_with_context(current_table_name))
+            .unwrap_or_else(|| "Unknown".to_string());
+
+        if self.close_active_buffer() {
+            if self.history.len() == 1 && matches!(self.history.get(0), Some(AppView::Intro)) {
+                format!("Closed '{}' - returned to Intro", closed_name)
+            } else {
+                format!("Closed '{}'", closed_name)
+            }
+        } else {
+            format!("Buffer '{}' could not be closed", closed_name)
+        }
+    }
+}