buffer as a feature

client/src/buffer/functions.rs

@@ -0,0 +1,35 @@
+// src/buffer/functions/buffer.rs
+
+use crate::buffer::state::BufferState;
+use crate::buffer::state::AppView;
+
+pub fn get_view_layer(view: &AppView) -> u8 {
+    match view {
+        AppView::Intro => 1,
+        AppView::Login | AppView::Register | AppView::Admin | AppView::AddTable | AppView::AddLogic => 2,
+        AppView::Form | AppView::Scratch => 3,
+    }
+}
+
+/// Switches the active buffer index.
+pub fn switch_buffer(buffer_state: &mut BufferState, next: bool) -> bool {
+    if buffer_state.history.len() <= 1 {
+        return false;
+    }
+
+    let len = buffer_state.history.len();
+    let current_index = buffer_state.active_index;
+    let new_index = if next {
+        (current_index + 1) % len
+    } else {
+        (current_index + len - 1) % len
+    };
+
+    if new_index != current_index {
+        buffer_state.active_index = new_index;
+        true
+    } else {
+        false
+    }
+}
+

client/src/buffer/mod.rs

@@ -0,0 +1,9 @@
+// src/buffer/mod.rs
+
+pub mod state;
+pub mod functions;
+pub mod ui;
+
+pub use state::{AppView, BufferState};
+pub use functions::*;
+pub use ui::render_buffer_list;

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)
+        }
+    }
+}

client/src/buffer/ui.rs

@@ -0,0 +1,80 @@
+// src/buffer/ui.rs
+
+use crate::config::colors::themes::Theme;
+use crate::buffer::state::BufferState;
+use crate::state::app::state::AppState;  // Add this import
+use ratatui::{
+    layout::{Alignment, Rect},
+    style::Style,
+    text::{Line, Span},
+    widgets::Paragraph,
+    Frame,
+};
+use unicode_width::UnicodeWidthStr;
+use crate::buffer::functions::get_view_layer;
+
+pub fn render_buffer_list(
+    f: &mut Frame,
+    area: Rect,
+    theme: &Theme,
+    buffer_state: &BufferState,
+    app_state: &AppState,
+) {
+    // --- Style Definitions ---
+    let active_style = Style::default()
+        .fg(theme.bg)
+        .bg(theme.highlight);
+
+    let inactive_style = Style::default()
+        .fg(theme.fg)
+        .bg(theme.bg);
+
+    // --- Determine Active Layer ---
+    let active_layer = match buffer_state.history.get(buffer_state.active_index) {
+        Some(view) => get_view_layer(view),
+        None => 1,
+    };
+
+    // --- Create Spans ---
+    let mut spans = Vec::new();
+    let mut current_width = 0;
+
+    let current_table_name = app_state.current_view_table_name.as_deref();
+
+    for (original_index, view) in buffer_state.history.iter().enumerate() {
+        // Filter: Only process views matching the active layer
+        if get_view_layer(view) != active_layer {
+            continue;
+        }
+
+        let is_active = original_index == buffer_state.active_index;
+        let buffer_name = view.display_name_with_context(current_table_name);
+        let buffer_text = format!(" {} ", buffer_name);
+        let text_width = UnicodeWidthStr::width(buffer_text.as_str());
+
+        // Calculate width needed for this buffer (separator + text)
+        let needed_width = text_width;
+        if current_width + needed_width > area.width as usize {
+            break;
+        }
+
+        // Add the buffer text itself
+        let text_style = if is_active { active_style } else { inactive_style };
+        spans.push(Span::styled(buffer_text, text_style));
+        current_width += text_width;
+    }
+
+    // --- Filler Span ---
+    let remaining_width = area.width.saturating_sub(current_width as u16);
+    if !spans.is_empty() || remaining_width > 0 {
+        spans.push(Span::styled(
+                " ".repeat(remaining_width as usize),
+                inactive_style,
+        ));
+    }
+
+    // --- Render ---
+    let buffer_line = Line::from(spans);
+    let paragraph = Paragraph::new(buffer_line).alignment(Alignment::Left);
+    f.render_widget(paragraph, area);
+}