#![expect(
    clippy::print_stderr,
    reason = "This is a CLI application, printing to stderr is expected and convenient"
)]

use anyhow::Result;
use clap::Subcommand;
use keycard_wallet::{KeycardWallet, clear_pairing, python_path};
use pyo3::prelude::*;

use crate::{
    WalletCore,
    cli::{SubcommandReturnValue, WalletSubcommand, read_mnemonic, read_pin},
};

/// Represents generic chain CLI subcommand.
#[derive(Subcommand, Debug, Clone)]
pub enum KeycardSubcommand {
    Available,
    Connect,
    Disconnect,
    Init,
    Load,
    /// Retrieve the private keys (NSK, VSK) for a given BIP-32 key path.
    ///
    /// Prints raw key material to stdout — intended for debugging only.
    /// Requires --reveal to confirm intent.
    /// Only available when built with the `keycard-debug` feature.
    #[cfg(feature = "keycard-debug")]
    GetPrivateKeys {
        /// BIP-32 derivation path, e.g. `m/44'/60'/0'/0/0`.
        #[arg(long)]
        key_path: String,
        /// Confirm that raw NSK and VSK should be disclosed on stdout.
        #[arg(long)]
        reveal: bool,
    },
}

impl KeycardSubcommand {
    fn handle_available(_wallet_core: &mut WalletCore) -> SubcommandReturnValue {
        Python::attach(|py| {
            python_path::add_python_path(py)
                .expect("`wallet::keycard::available`: unable to setup python path");

            let wallet = KeycardWallet::new(py)
                .expect("`wallet::keycard::available`: invalid data received for pin");
            let available = wallet
                .is_unpaired_keycard_available(py)
                .expect("`wallet::keycard::available`: received invalid data from Keycard wrapper");

            if available {
                println!("\u{2705} Keycard is available.");
            } else {
                println!("\u{274c} Keycard is not available.");
            }
        });

        SubcommandReturnValue::Empty
    }

    fn handle_connect(_wallet_core: &mut WalletCore) -> Result<SubcommandReturnValue> {
        let pin = read_pin()?;

        Python::attach(|py| {
            python_path::add_python_path(py)
                .expect("`wallet::keycard::connect`: unable to setup python path");

            let wallet = KeycardWallet::new(py)
                .expect("`wallet::keycard::connect`: invalid keycard wallet provided");

            wallet
                .connect(py, &pin)
                .expect("`wallet::keycard::connect`: failed to connect to keycard");

            println!("\u{2705} Keycard paired and ready.");
            drop(wallet.close_session(py));
        });

        Ok(SubcommandReturnValue::Empty)
    }

    fn handle_disconnect(_wallet_core: &mut WalletCore) -> Result<SubcommandReturnValue> {
        let pin = read_pin()?;

        Python::attach(|py| {
            python_path::add_python_path(py)
                .expect("`wallet::keycard::disconnect`: unable to setup python path");

            let wallet = KeycardWallet::new(py)
                .expect("`wallet::keycard::disconnect`: invalid keycard wallet provided");

            wallet
                .connect(py, &pin)
                .expect("`wallet::keycard::disconnect`: failed to open session");

            wallet
                .disconnect(py)
                .expect("`wallet::keycard::disconnect`: failed to unpair keycard");

            clear_pairing();
            println!("\u{2705} Keycard unpaired and pairing cleared.");
        });

        Ok(SubcommandReturnValue::Empty)
    }

    fn handle_init(_wallet_core: &mut WalletCore) -> Result<SubcommandReturnValue> {
        let pin = read_pin()?;

        Python::attach(|py| {
            python_path::add_python_path(py)
                .expect("`wallet::keycard::init`: unable to setup python path");

            let wallet = KeycardWallet::new(py)
                .expect("`wallet::keycard::init`: invalid keycard wallet provided");

            let initialized = wallet
                .initialize(py, &pin)
                .expect("`wallet::keycard::init`: failed to initialize keycard");

            if initialized {
                clear_pairing();
                println!("\u{2705} Keycard initialized successfully.");
            }
        });

        Ok(SubcommandReturnValue::Empty)
    }

    fn handle_load(_wallet_core: &mut WalletCore) -> Result<SubcommandReturnValue> {
        let pin = read_pin()?;
        let mnemonic = read_mnemonic()?;

        Python::attach(|py| {
            python_path::add_python_path(py)
                .expect("`wallet::keycard::load`: unable to setup python path");

            let wallet = KeycardWallet::new(py)
                .expect("`wallet::keycard::load`: invalid keycard wallet provided");

            wallet
                .connect(py, &pin)
                .expect("`wallet::keycard::load`: failed to connect to keycard");

            println!("\u{2705} Keycard is now connected to wallet.");
            if wallet.load_mnemonic(py, &mnemonic).is_ok() {
                println!("\u{2705} Mnemonic phrase loaded successfully.");
            } else {
                println!("\u{274c} Failed to load mnemonic phrase.");
            }
            drop(wallet.close_session(py));
        });

        Ok(SubcommandReturnValue::Empty)
    }

    #[cfg(feature = "keycard-debug")]
    fn handle_get_private_keys(
        key_path: &str,
        reveal: bool,
        _wallet_core: &mut WalletCore,
    ) -> Result<SubcommandReturnValue> {
        if !reveal {
            eprintln!(
                "WARNING: pass --reveal to print NSK and VSK. \
                 Disclosing either key fully compromises the account's privacy."
            );
            return Ok(SubcommandReturnValue::Empty);
        }
        eprintln!(
            "WARNING: NSK and VSK are being printed to stdout. \
             Any terminal log, scrollback, or screen recording captures these keys."
        );
        let pin = read_pin()?;
        let (nsk, vsk) = KeycardWallet::get_private_keys_for_path_with_connect(&pin, key_path)
            .map_err(anyhow::Error::from)?;
        println!("NSK: {}", hex::encode(*nsk));
        println!("VSK: {}", hex::encode(*vsk));
        Ok(SubcommandReturnValue::Empty)
    }
}

impl WalletSubcommand for KeycardSubcommand {
    async fn handle_subcommand(
        self,
        wallet_core: &mut WalletCore,
    ) -> Result<SubcommandReturnValue> {
        match self {
            Self::Available => Ok(Self::handle_available(wallet_core)),
            Self::Connect => Self::handle_connect(wallet_core),
            Self::Disconnect => Self::handle_disconnect(wallet_core),
            Self::Init => Self::handle_init(wallet_core),
            Self::Load => Self::handle_load(wallet_core),
            #[cfg(feature = "keycard-debug")]
            Self::GetPrivateKeys { key_path, reveal } => {
                Self::handle_get_private_keys(&key_path, reveal, wallet_core)
            }
        }
    }
}