#[cfg(feature = "bitcoin")]
mod bitcoin;
#[cfg(feature = "bitcoin")]
pub use self::bitcoin::*;

#[cfg(feature = "ethereum")]
mod ethereum;
#[cfg(feature = "ethereum")]
pub use ethereum::*;

#[cfg(feature = "solana")]
mod solana;
#[cfg(feature = "solana")]
pub use solana::*;

pub mod common;
pub use common::*;

use crate::{
    error::{Error, Result},
    messages::TrezorMessage,
    protos,
    protos::MessageType::*,
    transport::{ProtoMessage, Transport},
    Model,
};
use protobuf::MessageField;
use tracing::{debug, trace};

/// A Trezor client.
pub struct Trezor {
    model: Model,
    // Cached features for later inspection.
    features: Option<protos::Features>,
    transport: Box<dyn Transport>,
}

/// Create a new Trezor instance with the given transport.
pub fn trezor_with_transport(model: Model, transport: Box<dyn Transport>) -> Trezor {
    Trezor { model, transport, features: None }
}

impl Trezor {
    /// Get the model of the Trezor device.
    pub fn model(&self) -> Model {
        self.model
    }

    /// Get the features of the Trezor device.
    pub fn features(&self) -> Option<&protos::Features> {
        self.features.as_ref()
    }

    /// Sends a message and returns the raw ProtoMessage struct that was responded by the device.
    /// This method is only exported for users that want to expand the features of this library
    /// f.e. for supporting additional coins etc.
    pub fn call_raw<S: TrezorMessage>(&mut self, message: S) -> Result<ProtoMessage> {
        let proto_msg = ProtoMessage(S::MESSAGE_TYPE, message.write_to_bytes()?);
        self.transport.write_message(proto_msg).map_err(Error::TransportSendMessage)?;
        self.transport.read_message().map_err(Error::TransportReceiveMessage)
    }

    /// Sends a message and returns a TrezorResponse with either the expected response message,
    /// a failure or an interaction request.
    /// This method is only exported for users that want to expand the features of this library
    /// f.e. for supporting additional coins etc.
    pub fn call<'a, T, S: TrezorMessage, R: TrezorMessage>(
        &'a mut self,
        message: S,
        result_handler: Box<ResultHandler<'a, T, R>>,
    ) -> Result<TrezorResponse<'a, T, R>> {
        trace!("Sending {:?} msg: {:?}", S::MESSAGE_TYPE, message);
        let resp = self.call_raw(message)?;
        if resp.message_type() == R::MESSAGE_TYPE {
            let resp_msg = resp.into_message()?;
            trace!("Received {:?} msg: {:?}", R::MESSAGE_TYPE, resp_msg);
            Ok(TrezorResponse::Ok(result_handler(self, resp_msg)?))
        } else {
            match resp.message_type() {
                MessageType_Failure => {
                    let fail_msg = resp.into_message()?;
                    debug!("Received failure: {:?}", fail_msg);
                    Ok(TrezorResponse::Failure(fail_msg))
                }
                MessageType_ButtonRequest => {
                    let req_msg = resp.into_message()?;
                    trace!("Received ButtonRequest: {:?}", req_msg);
                    Ok(TrezorResponse::ButtonRequest(ButtonRequest {
                        message: req_msg,
                        client: self,
                        result_handler,
                    }))
                }
                MessageType_PinMatrixRequest => {
                    let req_msg = resp.into_message()?;
                    trace!("Received PinMatrixRequest: {:?}", req_msg);
                    Ok(TrezorResponse::PinMatrixRequest(PinMatrixRequest {
                        message: req_msg,
                        client: self,
                        result_handler,
                    }))
                }
                MessageType_PassphraseRequest => {
                    let req_msg = resp.into_message()?;
                    trace!("Received PassphraseRequest: {:?}", req_msg);
                    Ok(TrezorResponse::PassphraseRequest(PassphraseRequest {
                        message: req_msg,
                        client: self,
                        result_handler,
                    }))
                }
                mtype => {
                    debug!(
                        "Received unexpected msg type: {:?}; raw msg: {}",
                        mtype,
                        hex::encode(resp.into_payload())
                    );
                    Err(Error::UnexpectedMessageType(mtype))
                }
            }
        }
    }

    pub fn init_device(&mut self, session_id: Option<Vec<u8>>) -> Result<()> {
        let features = self.initialize(session_id)?.ok()?;
        self.features = Some(features);
        Ok(())
    }

    pub fn initialize(
        &mut self,
        session_id: Option<Vec<u8>>,
    ) -> Result<TrezorResponse<'_, Features, Features>> {
        let mut req = protos::Initialize::new();
        if let Some(session_id) = session_id {
            req.set_session_id(session_id);
        }
        self.call(req, Box::new(|_, m| Ok(m)))
    }

    pub fn ping(&mut self, message: &str) -> Result<TrezorResponse<'_, (), protos::Success>> {
        let mut req = protos::Ping::new();
        req.set_message(message.to_owned());
        self.call(req, Box::new(|_, _| Ok(())))
    }

    pub fn change_pin(&mut self, remove: bool) -> Result<TrezorResponse<'_, (), protos::Success>> {
        let mut req = protos::ChangePin::new();
        req.set_remove(remove);
        self.call(req, Box::new(|_, _| Ok(())))
    }

    pub fn wipe_device(&mut self) -> Result<TrezorResponse<'_, (), protos::Success>> {
        let req = protos::WipeDevice::new();
        self.call(req, Box::new(|_, _| Ok(())))
    }

    pub fn recover_device(
        &mut self,
        word_count: WordCount,
        passphrase_protection: bool,
        pin_protection: bool,
        label: String,
        dry_run: bool,
    ) -> Result<TrezorResponse<'_, (), protos::Success>> {
        let mut req = protos::RecoveryDevice::new();
        req.set_word_count(word_count as u32);
        req.set_passphrase_protection(passphrase_protection);
        req.set_pin_protection(pin_protection);
        req.set_label(label);
        req.set_enforce_wordlist(true);
        if dry_run {
            req.set_type(protos::RecoveryType::DryRun);
        } else {
            req.set_type(protos::RecoveryType::NormalRecovery);
        }
        req.set_input_method(protos::recovery_device::RecoveryDeviceInputMethod::ScrambledWords);
        //TODO(stevenroose) support languages
        req.set_language("english".to_owned());
        self.call(req, Box::new(|_, _| Ok(())))
    }

    #[allow(clippy::too_many_arguments)]
    pub fn reset_device(
        &mut self,
        display_random: bool,
        strength: usize,
        passphrase_protection: bool,
        pin_protection: bool,
        label: String,
        skip_backup: bool,
        no_backup: bool,
    ) -> Result<TrezorResponse<'_, EntropyRequest<'_>, protos::EntropyRequest>> {
        let mut req = protos::ResetDevice::new();
        req.set_display_random(display_random);
        req.set_strength(strength as u32);
        req.set_passphrase_protection(passphrase_protection);
        req.set_pin_protection(pin_protection);
        req.set_label(label);
        req.set_skip_backup(skip_backup);
        req.set_no_backup(no_backup);
        self.call(req, Box::new(|c, _| Ok(EntropyRequest { client: c })))
    }

    pub fn backup(&mut self) -> Result<TrezorResponse<'_, (), protos::Success>> {
        let req = protos::BackupDevice::new();
        self.call(req, Box::new(|_, _| Ok(())))
    }

    //TODO(stevenroose) support U2F stuff? currently ignored all

    pub fn apply_settings(
        &mut self,
        label: Option<String>,
        use_passphrase: Option<bool>,
        homescreen: Option<Vec<u8>>,
        auto_lock_delay_ms: Option<usize>,
    ) -> Result<TrezorResponse<'_, (), protos::Success>> {
        let mut req = protos::ApplySettings::new();
        if let Some(label) = label {
            req.set_label(label);
        }
        if let Some(use_passphrase) = use_passphrase {
            req.set_use_passphrase(use_passphrase);
        }
        if let Some(homescreen) = homescreen {
            req.set_homescreen(homescreen);
        }
        if let Some(auto_lock_delay_ms) = auto_lock_delay_ms {
            req.set_auto_lock_delay_ms(auto_lock_delay_ms as u32);
        }
        self.call(req, Box::new(|_, _| Ok(())))
    }

    pub fn sign_identity(
        &mut self,
        identity: protos::IdentityType,
        digest: Vec<u8>,
        curve: String,
    ) -> Result<TrezorResponse<'_, Vec<u8>, protos::SignedIdentity>> {
        let mut req = protos::SignIdentity::new();
        req.identity = MessageField::some(identity);
        req.set_challenge_hidden(digest);
        req.set_challenge_visual("".to_owned());
        req.set_ecdsa_curve_name(curve);
        self.call(req, Box::new(|_, m| Ok(m.signature().to_owned())))
    }

    pub fn get_ecdh_session_key(
        &mut self,
        identity: protos::IdentityType,
        peer_public_key: Vec<u8>,
        curve: String,
    ) -> Result<TrezorResponse<'_, protos::ECDHSessionKey, protos::ECDHSessionKey>> {
        let mut req = protos::GetECDHSessionKey::new();
        req.identity = MessageField::some(identity);
        req.set_peer_public_key(peer_public_key);
        req.set_ecdsa_curve_name(curve);
        self.call(req, Box::new(|_, m| Ok(m)))
    }
}