// Conversation extraction from JSONL transcripts
//
// extract_conversation  — parse JSONL transcript to messages
// split_on_compaction   — split messages at compaction boundaries

/// Extract conversation messages from a JSONL transcript file.
/// Returns (line_number, role, text, timestamp) tuples.
pub fn extract_conversation(jsonl_path: &str) -> Result<Vec<(usize, String, String, String)>, String> {
    let path = std::path::Path::new(jsonl_path);
    let messages = super::transcript::parse_transcript(path)?;
    Ok(messages.into_iter()
        .map(|m| (m.line, m.role, m.text, m.timestamp))
        .collect())
}

pub const COMPACTION_MARKER: &str = "This session is being continued from a previous conversation that ran out of context";

/// Split extracted messages into segments at compaction boundaries.
/// Each segment represents one continuous conversation before context was compacted.
pub fn split_on_compaction(messages: Vec<(usize, String, String, String)>) -> Vec<Vec<(usize, String, String, String)>> {
    let mut segments: Vec<Vec<(usize, String, String, String)>> = Vec::new();
    let mut current = Vec::new();

    for msg in messages {
        if msg.1 == "user" && msg.2.starts_with(COMPACTION_MARKER) {
            if !current.is_empty() {
                segments.push(current);
                current = Vec::new();
            }
            current.push(msg);
        } else {
            current.push(msg);
        }
    }
    if !current.is_empty() {
        segments.push(current);
    }

    segments
}