//! WhatsApp LLM message handler — runs an LLM turn for a non-command message.

use std::sync::Arc;

use super::super::WhatsAppWebhookContext;
use super::super::format::{chunk_for_whatsapp, markdown_to_whatsapp};
use super::super::history::save_whatsapp_history;

/// [`crate::chat::llm_turn::TransportFormat`] implementation for WhatsApp:
/// messages are markdown-converted then split to fit the platform's size
/// limit, and LLM errors are checked for an OAuth login link.
#[derive(Clone, Copy)]
struct WhatsAppFormat;

impl crate::chat::llm_turn::TransportFormat for WhatsAppFormat {
    fn format_and_chunk(&self, markdown: &str) -> Vec<String> {
        chunk_for_whatsapp(&markdown_to_whatsapp(markdown))
    }

    fn log_prefix(&self) -> &'static str {
        "[whatsapp]"
    }

    fn format_error(&self, err: &str) -> String {
        if let Some(url) = crate::llm::oauth::extract_login_url_from_error(err) {
            format!("Authentication required. Log in to Claude here: {url}")
        } else {
            format!("Error processing your request: {err}")
        }
    }
}

/// Forward a message to Claude Code and send the response back via WhatsApp.
pub(super) async fn handle_llm_message(
    ctx: &WhatsAppWebhookContext,
    sender: &str,
    user_message: &str,
) {
    use crate::chat::llm_turn::{LlmTurnContext, run_llm_turn};

    run_llm_turn(
        LlmTurnContext {
            transport: Arc::clone(&ctx.transport),
            key: sender,
            user: sender,
            services: &ctx.services,
            history: &ctx.history,
            history_size: ctx.history_size,
            save_history: save_whatsapp_history,
        },
        WhatsAppFormat,
        user_message,
    )
    .await;
}

// ── Tests ───────────────────────────────────────────────────────────────