mod cli;
mod config;
mod models;
mod ui;

use clap::Parser;
use cli::{Cli, Commands, parse_server_address};
use color_eyre::Result;
use config::SearchConfig;
use soulseek_rs::{Client, ClientSettings, PeerAddress};
use std::{
    env,
    sync::{Arc, atomic::AtomicBool},
    time::Duration,
};
use ui::{FileSelector, launch_main_tui, show_multi_download_progress};

fn main() -> Result<()> {
    dotenv::dotenv().ok();
    color_eyre::install()?;

    let cli = Cli::parse();

    let log_level = match cli.verbose {
        0 => "ERROR",
        1 => "WARN",
        2 => "INFO",
        3 => "DEBUG",
        _ => "TRACE",
    };
    // SAFETY: Called before any threads are spawned
    unsafe { env::set_var("LOG_LEVEL", log_level) };

    // Set LOG_FILE env var if provided via CLI
    if let Some(log_file) = &cli.log_file {
        // SAFETY: Called before any threads are spawned
        unsafe {
            env::set_var("LOG_FILE", log_file.to_string_lossy().to_string())
        };
    }

    let username = cli.username.ok_or_else(|| {
        color_eyre::eyre::eyre!(
            "Username required: use --username or set SOULSEEK_USERNAME env var"
        )
    })?;

    let password = cli.password.ok_or_else(|| {
        color_eyre::eyre::eyre!(
            "Password required: use --password or set SOULSEEK_PASSWORD env var"
        )
    })?;

    let (server_host, server_port) = parse_server_address(&cli.server)?;

    match cli.command {
        Some(Commands::Search {
            query,
            timeout,
            download_dir,
            max_concurrent_downloads,
        }) => {
            let config = SearchConfig {
                username,
                password,
                server_host,
                server_port,
                enable_listener: !cli.disable_listener,
                listener_port: cli.listener_port,
                query,
                timeout,
                download_dir,
                verbose: cli.verbose,
                max_concurrent_downloads,
            };
            search_and_download(config)
        }
        None => {
            // Launch main TUI
            // Enable logger buffering BEFORE connection to prevent log artifacts
            soulseek_rs::utils::logger::enable_buffering();

            let settings = ClientSettings {
                username: username.clone(),
                password: password.clone(),
                server_address: PeerAddress::new(
                    server_host.clone(),
                    server_port,
                ),
                enable_listen: !cli.disable_listener,
                listen_port: cli.listener_port,
            };

            let mut client = Client::with_settings(settings);
            client.connect().map_err(|e| {
                color_eyre::eyre::eyre!("Failed to connect: {}", e)
            })?;
            client.login().map_err(|e| {
                color_eyre::eyre::eyre!("Failed to login: {}", e)
            })?;

            let client = Arc::new(client);

            // Clear screen and enable mouse capture before initializing TUI
            use ratatui::crossterm::{
                event::EnableMouseCapture,
                execute,
                terminal::{Clear, ClearType},
            };
            let _ = execute!(
                std::io::stdout(),
                Clear(ClearType::All),
                EnableMouseCapture
            );

            let terminal = ratatui::init();

            launch_main_tui(
                terminal,
                client,
                cli.download_dir,
                cli.max_concurrent_downloads,
                Duration::from_secs(cli.search_timeout),
            )
        }
    }
}

fn search_and_download(config: SearchConfig) -> Result<()> {
    if config.verbose > 0 {
        println!(
            "🔌 Connecting to Soulseek server {}:{}...",
            config.server_host, config.server_port
        );
    }

    let settings = ClientSettings {
        username: config.username.clone(),
        password: config.password.clone(),
        server_address: PeerAddress::new(
            config.server_host.clone(),
            config.server_port,
        ),
        enable_listen: config.enable_listener,
        listen_port: config.listener_port,
    };

    let mut client = Client::with_settings(settings);
    client
        .connect()
        .map_err(|e| color_eyre::eyre::eyre!("Failed to connect: {}", e))?;
    client
        .login()
        .map_err(|e| color_eyre::eyre::eyre!("Failed to login: {}", e))?;

    if config.verbose > 0 {
        println!("🔍 Searching for: {}", config.query);
    }

    // Wrap client in Arc for sharing with FileSelector
    let client = Arc::new(client);

    // Create cancel flag for search
    let cancel_flag = Arc::new(AtomicBool::new(false));

    // Start search in background thread
    let search_client = client.clone();
    let search_query = config.query.clone();
    let search_timeout = Duration::from_secs(config.timeout);
    let search_cancel = cancel_flag.clone();

    let _search_handle = std::thread::spawn(move || {
        search_client.search_with_cancel(
            &search_query,
            search_timeout,
            Some(search_cancel),
        )
    });

    // Launch FileSelector immediately with live search enabled
    let terminal = ratatui::init();
    let mut file_selector = FileSelector::new_with_live_search(
        client.clone(),
        config.query.clone(),
        Duration::from_secs(config.timeout),
        cancel_flag.clone(),
    );
    let (terminal, selected_indices) = file_selector.run(terminal)?;

    // Cancel search thread - no need to wait for it
    cancel_flag.store(true, std::sync::atomic::Ordering::Relaxed);

    // Get final results
    let results = client.get_search_results(&config.query);

    if selected_indices.is_empty() {
        ratatui::restore();
        println!("❌ No files selected for download");
        return Ok(());
    }

    // Directly map selected indices to file data (skip expensive all_files conversion)
    let selected_files: Vec<_> = selected_indices
        .iter()
        .filter_map(|&idx| {
            let mut current = 0;
            for result in &results {
                let next = current + result.files.len();
                if idx < next {
                    let file_idx = idx - current;
                    let file = &result.files[file_idx];
                    return Some((
                        file.name.clone(),
                        result.username.clone(),
                        file.size,
                    ));
                }
                current = next;
            }
            None
        })
        .collect();

    if selected_files.is_empty() {
        ratatui::restore();
        println!("❌ No files found in search results");
        return Ok(());
    }

    // Show multi-download progress view immediately (initializes downloads asynchronously)
    show_multi_download_progress(
        terminal,
        client,
        selected_files,
        config.download_dir,
        config.max_concurrent_downloads,
    )?;

    println!("\n✨ Download complete!");

    Ok(())
}