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use std::io::{self, Write};
use owo_colors::{OwoColorize, Stream::Stdout};
use rmcp::model::{self, CallToolResult};
use crate::{
cli::Cli,
client::{
ChatCompletionMessage, ChatCompletionRequest, Client, Content, MessageRole, ToolChoiceType,
},
error::AppResult,
tool::ManagerArc,
utility::fix_tool_call,
};
pub struct ReplSession {
client: Client,
manager: ManagerArc,
history: Vec<ChatCompletionMessage>,
model: String,
max_tokens: i64,
}
impl ReplSession {
pub fn new(client: Client, manager: ManagerArc, args: &Cli) -> Self {
let history = vec![ChatCompletionMessage {
role: MessageRole::system,
content: Content::Text(manager.system_prompt().into()),
name: None,
tool_calls: None,
tool_call_id: None,
}];
Self {
client,
manager,
history,
model: args.model.clone(),
max_tokens: args.max_tokens,
}
}
pub async fn run(&mut self) -> AppResult<()> {
println!("Database REPL started. Type 'exit' to quit.");
loop {
print!("User> ");
io::stdout().flush()?;
let mut user_input = String::new();
io::stdin().read_line(&mut user_input)?;
let user_input = user_input.trim();
if user_input.eq_ignore_ascii_case("exit") {
break;
}
if user_input.is_empty() {
continue;
}
self.history.push(ChatCompletionMessage {
role: MessageRole::user,
content: Content::Text(user_input.to_string()),
name: None,
tool_calls: None,
tool_call_id: None,
});
'chat_response: loop {
match self
.client
.chat_completion(
ChatCompletionRequest::new(self.model.clone(), self.history.clone())
.tool_choice(ToolChoiceType::Auto)
.max_tokens(self.max_tokens),
)
.await
{
Ok(response) => {
if let Some(choice) = response.choices.into_iter().next() {
let assistant_message = choice.message;
self.history.push(ChatCompletionMessage {
role: MessageRole::assistant,
content: assistant_message
.content
.clone()
.map_or(Content::Text("".into()), Content::Text),
name: assistant_message.name.clone(),
tool_calls: assistant_message.tool_calls.as_ref().map(
|tool_calls| {
tool_calls.iter().cloned().map(fix_tool_call).collect()
},
),
tool_call_id: None,
});
if let Some(tool_calls) = assistant_message.tool_calls {
for (tool_call_id, function_name, params_json) in
tool_calls.into_iter().filter_map(|tool| {
let params: Option<serde_json::Value> = tool
.function
.arguments
.and_then(|args| serde_json::from_str(&args).ok());
Some((tool.id, tool.function.name?, params))
})
{
let tool_result = match function_name.as_str() {
"mysqlGetDatabaseSchema" => {
self.manager.get_database_schema().await
}
"mysqlExecuteQuery" => {
if let Some(params_json) = params_json {
match serde_json::from_value(params_json) {
Ok(params) => {
self.manager.execute_query(params).await
}
Err(err) => Err(err.into()),
}
} else {
Ok(CallToolResult::error(vec![
model::Content::text(format!(
"Missing required parameter for {}",
function_name,
)),
]))
}
}
_ => Ok(CallToolResult::error(vec![model::Content::text(
format!("Unknown tool: {}", function_name),
)])),
};
let result_content = match tool_result {
Ok(result) => {
// Assuming CallToolResult content is a Vec<Content>, and the first one is text.
if let Some(text) = result
.content
.first()
.and_then(|content| content.as_text())
{
text.text.clone()
} else if result.is_error.unwrap_or(false) {
format!(
"Tool error {}: {:?}",
function_name, result.content,
)
} else {
"Tool returned non-text or empty content".into()
}
}
Err(err) => {
format!(
"Error executing tool {}: {}",
function_name, err
)
}
};
self.history.push(ChatCompletionMessage {
role: MessageRole::tool,
tool_call_id: Some(tool_call_id),
name: Some(function_name),
content: Content::Text(result_content),
tool_calls: None,
});
}
continue 'chat_response;
} else if let Some(text) = assistant_message.content {
println!(
"{}",
format!("Assistant> {}", text.trim())
.if_supports_color(Stdout, |text| text.blue())
);
}
}
break 'chat_response;
}
Err(err) => {
println!(
"{}",
format!("ERROR: {}", err).if_supports_color(Stdout, |text| text.red())
);
self.history.pop();
break 'chat_response;
}
}
}
}
Ok(())
}
}