// memory-search CLI — thin wrapper around poc_memory::memory_search
//
// --hook: run hook logic (for debugging; poc-hook calls the library directly)
// no args: show seen set for current session

use clap::Parser;
use std::fs;
use std::io::{self, Read, Write};

const STASH_PATH: &str = "/tmp/claude-memory-search/last-input.json";

#[derive(Parser)]
#[command(name = "memory-search")]
struct Args {
    /// Run hook logic (reads JSON from stdin or stash file)
    #[arg(long)]
    hook: bool,
}

fn show_seen() {
    let input = match fs::read_to_string(STASH_PATH) {
        Ok(s) => s,
        Err(_) => { eprintln!("No session state available"); return; }
    };
    let Some(session) = poc_memory::memory_search::Session::from_json(&input) else {
        eprintln!("No session state available");
        return;
    };

    println!("Session: {}", session.session_id);

    if let Ok(cookie) = fs::read_to_string(&session.path("cookie")) {
        println!("Cookie:  {}", cookie.trim());
    }

    match fs::read_to_string(&session.path("compaction")) {
        Ok(s) => {
            let offset: u64 = s.trim().parse().unwrap_or(0);
            let ts = poc_memory::transcript::compaction_timestamp(&session.transcript_path, offset);
            match ts {
                Some(t) => println!("Last compaction: offset {} ({})", offset, t),
                None => println!("Last compaction: offset {}", offset),
            }
        }
        Err(_) => println!("Last compaction: none detected"),
    }

    let pending = fs::read_dir(&session.path("chunks")).ok()
        .map(|d| d.flatten().count()).unwrap_or(0);
    if pending > 0 {
        println!("Pending chunks: {}", pending);
    }

    for (label, suffix) in [("Current seen set", ""), ("Previous seen set (pre-compaction)", "-prev")] {
        let path = session.state_dir.join(format!("seen{}-{}", suffix, session.session_id));
        let content = fs::read_to_string(&path).unwrap_or_default();
        let lines: Vec<&str> = content.lines().filter(|s| !s.is_empty()).collect();
        if lines.is_empty() { continue; }

        println!("\n{} ({}):", label, lines.len());
        for line in &lines { println!("  {}", line); }
    }
}

fn main() {
    let args = Args::parse();

    if args.hook {
        // Read from stdin if piped, otherwise from stash
        let input = {
            let mut buf = String::new();
            io::stdin().read_to_string(&mut buf).ok();
            if buf.trim().is_empty() {
                fs::read_to_string(STASH_PATH).unwrap_or_default()
            } else {
                let _ = fs::create_dir_all("/tmp/claude-memory-search");
                let _ = fs::write(STASH_PATH, &buf);
                buf
            }
        };

        let output = poc_memory::memory_search::run_hook(&input);
        print!("{}", output);
    } else {
        show_seen()
    }
}