llm 1.3.8

A Rust library unifying multiple LLM backends.
Documentation 
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use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};

use crate::dialogue::{DialogueConfig, DialogueMode, DialogueParticipant};
use crate::provider::ProviderId;

use super::id::ConversationId;
use super::message::{ConversationMessage, MessageKind, MessageRole};

const TITLE_MAX_CHARS: usize = 48;

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Conversation {
    pub id: ConversationId,
    #[serde(default)]
    pub parent_id: Option<ConversationId>,
    pub title: String,
    pub created_at: DateTime<Utc>,
    pub updated_at: DateTime<Utc>,
    pub provider_id: ProviderId,
    pub model: Option<String>,
    pub system_prompt: Option<String>,
    pub messages: Vec<ConversationMessage>,
    pub dirty: bool,
    /// Dialogue mode when multiple LLMs are participating.
    #[serde(default)]
    pub dialogue_mode: Option<DialogueMode>,
    /// Participants in a multi-LLM dialogue.
    #[serde(default)]
    pub participants: Vec<DialogueParticipant>,
    /// Dialogue configuration (initial prompt, turn mode, etc.).
    #[serde(default)]
    pub dialogue_config: Option<DialogueConfig>,
}

impl Conversation {
    pub fn new(
        provider_id: ProviderId,
        model: Option<String>,
        system_prompt: Option<String>,
    ) -> Self {
        let now = Utc::now();
        Self {
            id: ConversationId::new(),
            parent_id: None,
            title: "New conversation".to_string(),
            created_at: now,
            updated_at: now,
            provider_id,
            model,
            system_prompt,
            messages: Vec::new(),
            dirty: false,
            dialogue_mode: None,
            participants: Vec::new(),
            dialogue_config: None,
        }
    }

    /// Returns whether this conversation is a multi-LLM dialogue.
    #[must_use]
    #[allow(dead_code)]
    pub fn is_dialogue(&self) -> bool {
        self.dialogue_mode.is_some() && !self.participants.is_empty()
    }

    /// Starts a dialogue with the given mode and participants.
    pub fn start_dialogue(
        &mut self,
        mode: DialogueMode,
        config: DialogueConfig,
        participants: Vec<DialogueParticipant>,
    ) {
        self.dialogue_mode = Some(mode);
        self.dialogue_config = Some(config);
        self.participants = participants;
        self.updated_at = Utc::now();
        self.dirty = true;
    }

    /// Ends the dialogue, returning to single-LLM mode.
    pub fn end_dialogue(&mut self) {
        self.dialogue_mode = None;
        self.dialogue_config = None;
        self.participants.clear();
        self.updated_at = Utc::now();
        self.dirty = true;
    }

    pub fn push_message(&mut self, message: ConversationMessage) {
        self.messages.push(message);
        self.updated_at = Utc::now();
        self.dirty = true;
    }

    pub fn title_from_first_user(&mut self) {
        let first_user = self
            .messages
            .iter()
            .find(|msg| msg.role == MessageRole::User);
        if let Some(msg) = first_user {
            if let MessageKind::Text(text) = &msg.kind {
                self.title = truncate_title(text);
            }
        }
    }
}

fn truncate_title(text: &str) -> String {
    let trimmed = text.trim();
    let mut chars = trimmed.chars();
    let mut title = chars.by_ref().take(TITLE_MAX_CHARS).collect::<String>();
    if chars.next().is_some() {
        title.push_str("...");
    }
    if title.is_empty() {
        "Conversation".to_string()
    } else {
        title
    }
}