use crate::common::network_paths_and_settings::block_extension_and_paths;
use crate::common::network_startup::get_listen_socket;
use crate::create_dir_all;
use crate::exit;
use crate::flexi_logger::{
    Cleanup, Criterion, DeferredNow, FileSpec, Logger, LoggerHandle, Naming, Record, WriteMode,
};
use crate::log::{error, info};
use crate::miner::genesis::create_genesis_transaction;
use crate::miner::mining::mine_block;
use crate::panic;
use crate::records::memory::chain_state::rebuild_chain_state_cache;
use crate::records::memory::mempool::{init_db, setup_mempool};
use crate::records::memory::network_mapping::NodeInfo;
use crate::records::memory::response_channels::Command;
use crate::records::record_chain::rewards_tx::rebuild_immature_reward_window;
use crate::rpc::server::start_rpc::start_rpc;
use crate::sled::Db;
use crate::startup::connections::handle_connections;
use crate::startup::daemonize::{install_shutdown_cleanup, remove_registered_pid_file};
use crate::startup::initialize_startup::open_chain_state;
use crate::verifications::verification_service::initialize_global_verification_service;
use crate::wallets::structures::Wallet;
use crate::Arc;
use crate::Error;
use crate::HashMap;
use crate::Mutex;
use crate::Settings;
use std::io::Write;
use std::path::Path;

// The runtime logger is shared by the normal console node path and the Windows service path.
fn format_log(
    writer: &mut dyn Write,
    now: &mut DeferredNow,
    record: &Record<'_>,
) -> Result<(), std::io::Error> {
    write!(
        writer,
        "[{}] {} [{}] {}",
        now.now().format("%Y-%m-%d %H:%M:%S"),
        record.level(),
        record.target(),
        record.args()
    )
}

pub async fn initialize_node_logging() -> Result<LoggerHandle, Box<dyn Error>> {
    let (
        _network_name,
        _padded_base_coin,
        _suffix,
        _torrent_path,
        _wallet_path,
        _block_path,
        _db_path,
        _balance_path,
        log_path,
    ) = block_extension_and_paths();

    // Create the log folder before flexi_logger tries to open the rotating file.
    create_dir_all(Path::new(&log_path)).await?;

    // Runtime logging goes to a rotating node log shared by service and console startup paths.
    let handle = Logger::try_with_str(&Settings::load()?.log_level)?
        .format(format_log)
        .log_to_file(FileSpec::default().directory(&log_path).basename("node"))
        .rotate(
            Criterion::Size(10_000_000),
            Naming::Numbers,
            Cleanup::KeepLogFiles(10),
        )
        .write_mode(WriteMode::BufferAndFlush)
        .start()?;

    Ok(handle)
}

pub fn install_panic_cleanup() {
    // Panic cleanup removes the Linux PID file so later restarts do not trip over stale state.
    panic::set_hook(Box::new(|info| {
        eprintln!("Application panicked: {info}");
        error!("Application panicked: {info}");
        remove_registered_pid_file();
        exit(1);
    }));
}

pub fn clear_ip_scores(db: &Db) -> sled::Result<()> {
    // IP reputation is runtime-only state, so each process start begins with a clean score table.
    let tree = db.open_tree("ip_rep_system")?;
    tree.clear()?;
    Ok(())
}

pub async fn run_unlocked_node(wallet: Arc<Wallet>, install_shutdown: bool) -> Result<(), String> {
    // Once the wallet is available, the shared node runtime performs the remaining
    // startup work for both Linux foreground/daemon mode and the Windows service path.
    info!(
        "Initializing PostgreSQL mempool connection for host={} port={} dbname={}",
        Settings::load().map_err(|e| e.to_string())?.pg_host,
        Settings::load().map_err(|e| e.to_string())?.pg_port,
        Settings::load().map_err(|e| e.to_string())?.pg_dbname
    );
    init_db().await.map_err(|e| e.to_string())?;

    info!("Creating or validating PostgreSQL mempool tables.");
    setup_mempool().await.map_err(|e| e.to_string())?;
    info!("PostgreSQL mempool tables are ready.");

    // Open sled after Postgres is ready so block state and mempool state start together.
    let db = open_chain_state().await;
    if let Err(err) = rebuild_chain_state_cache(&db).await {
        error!("[chain_state] failed to rebuild startup chain state cache: {err}");
    }
    if let Err(err) = rebuild_immature_reward_window(&db).await {
        error!("[rewards] failed to rebuild immature reward window: {err}");
    }

    if install_shutdown {
        // Console/daemon mode owns signal cleanup; Windows service shutdown is handled separately.
        #[cfg(unix)]
        install_shutdown_cleanup(db.clone());
        #[cfg(not(unix))]
        install_shutdown_cleanup();
    }

    if let Err(e) = clear_ip_scores(&db) {
        eprintln!("Failed to clear IP scores: {e}");
        error!("Failed to clear IP scores: {e}");
    }

    match NodeInfo::load_recovery_snapshot().await {
        Ok(loaded) if loaded > 0 => {
            info!("[network_map] loaded {loaded} recovered node records with monitors cleared");
            if let Err(err) = NodeInfo::rebuild_mined_counts_from_chain(&db).await {
                error!("[network_map] failed to rebuild recovered mined counts: {err}");
            }
        }
        Ok(_) => {}
        Err(err) => error!("[network_map] failed to load recovery snapshot: {err}"),
    }

    let wallet_for_server = wallet.clone();
    let map: Arc<Mutex<Command>> = Arc::new(Mutex::new(HashMap::new()));
    let map_cloned = Arc::clone(&map);
    let db_server = db.clone();
    let verification_service = Arc::new(initialize_global_verification_service());
    let server_address = get_listen_socket().await;

    // Mainnet is intentionally blocked until launch.
    #[cfg(feature = "mainnet")]
    {
        compile_error!("The 'mainnet' feature is not allowed to be built.");
    }

    // The RPC server starts first so handshake traffic can begin while the rest of the
    // node initialization continues.
    tokio::spawn(async move {
        start_rpc(&db_server, server_address, wallet_for_server, map_cloned).await;
    });

    // Connection management, genesis creation, and mining then proceed in the same
    // unlocked runtime regardless of how the process was launched.
    handle_connections(db.clone(), wallet.clone(), map.clone())
        .await
        .map_err(|e| format!("Startup connection error: {e}"))?;

    create_genesis_transaction(
        &db,
        verification_service.clone(),
        wallet.clone(),
        map.clone(),
    )
    .await;

    mine_block(&db, verification_service, wallet.clone(), map.clone())
        .await
        .map_err(|e| format!("Mining loop error: {e}"))?;

    // If mining exits normally, cleanup any daemon PID file left by startup.
    remove_registered_pid_file();
    Ok(())
}