use crate::api::{ChatMessage, Part};
use crate::config::{PermissionLevel, StoredConfig, Theme};
#[derive(Debug)]
pub struct ChatState {
pub config: StoredConfig,
pub history: Vec<ChatMessage>,
pub messages: Vec<MessageLine>,
pub input: String,
pub cursor: usize,
pub scroll: u16,
pub input_scroll: u16,
pub streaming_parts: Vec<Part>,
pub session_id: String,
pub message_queue: Vec<String>,
pub input_history: Vec<(String, usize)>,
pub redo_history: Vec<(String, usize)>,
pub sent_history_index: Option<usize>,
pub input_draft: String,
pub shell_focused: bool,
pub focused_shell_session_id: Option<String>,
pub focused_shell_pid: Option<u32>,
pub last_chunk_was_thought: bool,
pub messages_area: std::cell::Cell<Option<ratatui::layout::Rect>>,
pub message_line_ranges: std::cell::RefCell<Vec<(usize, usize, usize)>>,
}
impl ChatState {
pub fn new(config: StoredConfig) -> Self {
let session_id = format!(
"session_{}",
std::time::SystemTime::now()
.duration_since(std::time::UNIX_EPOCH)
.unwrap_or_default()
.as_secs()
);
Self {
config,
history: Vec::new(),
messages: Vec::new(),
input: String::new(),
cursor: 0,
scroll: 0,
input_scroll: 0,
streaming_parts: Vec::new(),
session_id,
message_queue: Vec::new(),
input_history: Vec::new(),
redo_history: Vec::new(),
sent_history_index: None,
input_draft: String::new(),
shell_focused: false,
focused_shell_session_id: None,
focused_shell_pid: None,
last_chunk_was_thought: false,
messages_area: std::cell::Cell::new(None),
message_line_ranges: std::cell::RefCell::new(Vec::new()),
}
}
pub fn get_user_prompts(&self) -> Vec<String> {
self.history
.iter()
.filter(|m| m.role == "user")
.filter_map(|m| {
m.parts
.first()
.and_then(|p| p.get("text"))
.and_then(|t| t.as_str())
.map(|s| s.to_owned())
})
.collect()
}
pub fn navigate_history_up(&mut self) {
let prompts = self.get_user_prompts();
if prompts.is_empty() {
return;
}
let next_index = match self.sent_history_index {
None => {
self.input_draft = self.input.clone();
prompts.len().saturating_sub(1)
}
Some(idx) => idx.saturating_sub(1),
};
if next_index < prompts.len() {
self.input = prompts[next_index].clone();
self.cursor = self.input.chars().count();
self.sent_history_index = Some(next_index);
}
}
pub fn navigate_history_down(&mut self) {
let prompts = self.get_user_prompts();
if prompts.is_empty() {
return;
}
if let Some(idx) = self.sent_history_index {
let next_index = idx + 1;
if next_index >= prompts.len() {
self.input = self.input_draft.clone();
self.cursor = self.input.chars().count();
self.sent_history_index = None;
} else {
self.input = prompts[next_index].clone();
self.cursor = self.input.chars().count();
self.sent_history_index = Some(next_index);
}
}
}
pub fn save_history(&mut self) {
let current = (self.input.clone(), self.cursor);
if self.input_history.last() != Some(¤t) {
self.input_history.push(current);
if self.input_history.len() > 100 {
self.input_history.remove(0);
}
}
self.redo_history.clear();
}
pub fn undo(&mut self) {
if let Some((prev_input, prev_cursor)) = self.input_history.pop() {
self.redo_history.push((self.input.clone(), self.cursor));
self.input = prev_input;
self.cursor = prev_cursor;
}
}
pub fn redo(&mut self) {
if let Some((next_input, next_cursor)) = self.redo_history.pop() {
self.input_history.push((self.input.clone(), self.cursor));
self.input = next_input;
self.cursor = next_cursor;
}
}
pub fn insert_char(&mut self, c: char) {
self.save_history();
let byte_idx = self
.input
.char_indices()
.nth(self.cursor)
.map(|(i, _)| i)
.unwrap_or(self.input.len());
self.input.insert(byte_idx, c);
self.cursor += 1;
}
pub fn insert_text(&mut self, text: &str) {
self.save_history();
let byte_idx = self
.input
.char_indices()
.nth(self.cursor)
.map(|(i, _)| i)
.unwrap_or(self.input.len());
self.input.insert_str(byte_idx, text);
self.cursor += text.chars().count();
}
pub fn remove_char(&mut self) {
if self.cursor > 0 {
self.save_history();
self.cursor -= 1;
let byte_idx = self
.input
.char_indices()
.nth(self.cursor)
.map(|(i, _)| i)
.unwrap();
self.input.remove(byte_idx);
}
}
pub fn delete_char(&mut self) {
if self.cursor < self.input.chars().count() {
self.save_history();
let byte_idx = self
.input
.char_indices()
.nth(self.cursor)
.map(|(i, _)| i)
.unwrap();
self.input.remove(byte_idx);
}
}
pub fn move_cursor_left(&mut self) {
self.cursor = self.cursor.saturating_sub(1);
}
pub fn move_cursor_right(&mut self) {
if self.cursor < self.input.chars().count() {
self.cursor += 1;
}
}
pub fn move_cursor_up(&mut self) {
let text = &self.input;
let mut lines = vec![0];
for (i, c) in text.chars().enumerate() {
if c == '\n' {
lines.push(i + 1);
}
}
let mut current_line = 0;
for (i, &start) in lines.iter().enumerate() {
if self.cursor >= start {
current_line = i;
}
}
if current_line > 0 {
let col = self.cursor - lines[current_line];
let prev_line_start = lines[current_line - 1];
let prev_line_end = lines[current_line] - 1;
let prev_line_len = prev_line_end - prev_line_start;
self.cursor = prev_line_start + col.min(prev_line_len);
} else {
self.cursor = 0;
}
}
pub fn move_cursor_down(&mut self) {
let text = &self.input;
let mut lines = vec![0];
for (i, c) in text.chars().enumerate() {
if c == '\n' {
lines.push(i + 1);
}
}
let end_idx = text.chars().count();
lines.push(end_idx + 1);
let mut current_line = 0;
for (i, &start) in lines.iter().enumerate() {
if self.cursor >= start
&& self.cursor < lines.get(i + 1).copied().unwrap_or(end_idx + 1)
{
current_line = i;
break;
}
}
if current_line + 1 < lines.len() - 1 {
let col = self.cursor - lines[current_line];
let next_line_start = lines[current_line + 1];
let next_line_end = lines[current_line + 2] - 1;
let next_line_len = next_line_end.saturating_sub(next_line_start);
self.cursor = (next_line_start + col)
.min(next_line_start + next_line_len)
.min(end_idx);
} else {
self.cursor = end_idx;
}
}
pub fn move_cursor_start(&mut self) {
let text = &self.input;
let mut start_of_line = 0;
for (i, c) in text.chars().enumerate() {
if i == self.cursor {
break;
}
if c == '\n' {
start_of_line = i + 1;
}
}
self.cursor = start_of_line;
}
pub fn move_cursor_end(&mut self) {
let text = &self.input;
let mut end_of_line = text.chars().count();
for (i, c) in text.chars().enumerate().skip(self.cursor) {
if c == '\n' {
end_of_line = i;
break;
}
}
self.cursor = end_of_line;
}
}
#[derive(Debug)]
pub struct MessageLine {
pub author: &'static str,
pub text: String,
pub pending: bool,
pub is_shell: bool,
pub shell_success: bool,
pub shell_cmd: String,
pub shell_pid: Option<u32>,
pub shell_session_id: Option<String>,
pub is_tool: bool,
pub cached_wrapped:
std::cell::RefCell<Option<(usize, Theme, Vec<ratatui::text::Line<'static>>)>>,
}
impl MessageLine {
pub fn error(text: String) -> Self {
Self {
author: "System",
text,
pending: false,
is_shell: false,
shell_success: false,
shell_cmd: String::new(),
shell_pid: None,
shell_session_id: None,
is_tool: false,
cached_wrapped: std::cell::RefCell::new(None),
}
}
pub fn user(text: String) -> Self {
Self {
author: "You",
text,
pending: false,
is_shell: false,
shell_success: false,
shell_cmd: String::new(),
shell_pid: None,
shell_session_id: None,
is_tool: false,
cached_wrapped: std::cell::RefCell::new(None),
}
}
pub fn assistant(text: String) -> Self {
Self {
author: "Darwin",
text,
pending: false,
is_shell: false,
shell_success: false,
shell_cmd: String::new(),
shell_pid: None,
shell_session_id: None,
is_tool: false,
cached_wrapped: std::cell::RefCell::new(None),
}
}
pub fn info(text: String) -> Self {
Self {
author: "Info",
text,
pending: false,
is_shell: false,
shell_success: false,
shell_cmd: String::new(),
shell_pid: None,
shell_session_id: None,
is_tool: false,
cached_wrapped: std::cell::RefCell::new(None),
}
}
pub fn tool(text: String) -> Self {
Self {
author: "Darwin",
text,
pending: false,
is_shell: false,
shell_success: false,
shell_cmd: String::new(),
shell_pid: None,
shell_session_id: None,
is_tool: true,
cached_wrapped: std::cell::RefCell::new(None),
}
}
pub fn shell(
cmd: String,
output: String,
success: bool,
shell_session_id: Option<String>,
) -> Self {
Self {
author: "Shell",
text: output,
pending: false,
is_shell: true,
shell_success: success,
shell_cmd: cmd,
shell_pid: None,
shell_session_id,
is_tool: false,
cached_wrapped: std::cell::RefCell::new(None),
}
}
pub fn pending() -> Self {
Self {
author: "Darwin",
text: String::new(),
pending: true,
is_shell: false,
shell_success: false,
shell_cmd: String::new(),
shell_pid: None,
shell_session_id: None,
is_tool: false,
cached_wrapped: std::cell::RefCell::new(None),
}
}
}
#[derive(Clone, Debug)]
pub struct CommandSuggestion {
pub name: String,
pub description: String,
}
pub enum ChatCommand {
Settings,
Exit,
Models,
Permissions(Option<PermissionLevel>),
Resume(Option<String>),
Clear,
New,
History,
Undo,
Shell(Option<String>),
Help,
Unknown(String),
}
impl ChatCommand {
pub fn parse(input: &str) -> Option<Self> {
let mut parts = input.split_whitespace();
let command = parts.next()?;
if !command.starts_with('/') {
return None;
}
Some(match command {
"/settings" => Self::Settings,
"/exit" | "/quit" => Self::Exit,
"/models" => Self::Models,
"/permissions" => {
let arg = parts.next().map(|s| s.to_lowercase());
let level = match arg.as_deref() {
Some("safe") => Some(PermissionLevel::Safe),
Some("guardian") => Some(PermissionLevel::Guardian),
Some("chaos") => Some(PermissionLevel::Chaos),
_ => None,
};
Self::Permissions(level)
}
"/resume" => {
let arg = parts.next().map(|s| s.to_owned());
Self::Resume(arg)
}
"/shell" => {
let arg = parts.next().map(|s| s.to_owned());
Self::Shell(arg)
}
"/clear" => Self::Clear,
"/new" => Self::New,
"/history" => Self::History,
"/undo" => Self::Undo,
"/help" => Self::Help,
value => Self::Unknown(value.to_owned()),
})
}
pub fn suggestions() -> Vec<CommandSuggestion> {
vec![
CommandSuggestion {
name: "/settings".to_owned(),
description: "Open settings".to_owned(),
},
CommandSuggestion {
name: "/models".to_owned(),
description: "List available models".to_owned(),
},
CommandSuggestion {
name: "/permissions".to_owned(),
description: "Cycle permission levels".to_owned(),
},
CommandSuggestion {
name: "/resume".to_owned(),
description: "Resume saved chat sessions".to_owned(),
},
CommandSuggestion {
name: "/shell".to_owned(),
description: "List or focus active shell sessions".to_owned(),
},
CommandSuggestion {
name: "/new".to_owned(),
description: "Start a new chat session".to_owned(),
},
CommandSuggestion {
name: "/clear".to_owned(),
description: "Clear current chat history".to_owned(),
},
CommandSuggestion {
name: "/history".to_owned(),
description: "List history in chat".to_owned(),
},
CommandSuggestion {
name: "/undo".to_owned(),
description: "Revert all file changes made in the last prompt".to_owned(),
},
CommandSuggestion {
name: "/help".to_owned(),
description: "Show available commands".to_owned(),
},
CommandSuggestion {
name: "/exit".to_owned(),
description: "Quit darwincode".to_owned(),
},
]
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_chat_history_navigation() {
let config = StoredConfig::default();
let mut chat = ChatState::new(config);
chat.history
.push(ChatMessage::user("first prompt".to_owned()));
chat.history
.push(ChatMessage::user("second prompt".to_owned()));
chat.input = "current draft".to_owned();
chat.navigate_history_up();
assert_eq!(chat.input, "second prompt");
assert_eq!(chat.sent_history_index, Some(1));
assert_eq!(chat.input_draft, "current draft");
chat.navigate_history_up();
assert_eq!(chat.input, "first prompt");
assert_eq!(chat.sent_history_index, Some(0));
chat.navigate_history_up();
assert_eq!(chat.input, "first prompt");
assert_eq!(chat.sent_history_index, Some(0));
chat.navigate_history_down();
assert_eq!(chat.input, "second prompt");
assert_eq!(chat.sent_history_index, Some(1));
chat.navigate_history_down();
assert_eq!(chat.input, "current draft");
assert_eq!(chat.sent_history_index, None);
}
#[test]
fn test_undo_command_parsing() {
let parsed = ChatCommand::parse("/undo");
assert!(matches!(parsed, Some(ChatCommand::Undo)));
let suggestions = ChatCommand::suggestions();
assert!(suggestions.iter().any(|s| s.name == "/undo"));
}
}