use crate::prelude::*;
use bitcoin::hashes::hex;
use bitcoin::hashes::hex::ToHex;
use bitcoin::util::address::Payload;
use bitcoin::{Address, Network, Script};
use lightning::chain::keysinterface::InMemorySigner;
use lightning::ln::chan_utils::{ChannelPublicKeys, HTLCOutputInCommitment, TxCreationKeys};

/// Debug printer for ChannelPublicKeys which doesn't have one.
pub struct DebugChannelPublicKeys<'a>(pub &'a ChannelPublicKeys);
impl<'a> core::fmt::Debug for DebugChannelPublicKeys<'a> {
    fn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
        f.debug_struct("ChannelPublicKeys")
            .field("funding_pubkey", &self.0.funding_pubkey)
            .field("revocation_basepoint", &self.0.revocation_basepoint)
            .field("payment_point", &self.0.payment_point)
            .field("delayed_payment_basepoint", &self.0.delayed_payment_basepoint)
            .field("htlc_basepoint", &self.0.htlc_basepoint)
            .finish()
    }
}

macro_rules! log_channel_public_keys {
    ($obj: expr) => {
        &crate::util::debug_utils::DebugChannelPublicKeys(&$obj)
    };
}

/// log the enforcement state at the trace level
#[macro_export]
macro_rules! trace_enforcement_state {
    ($estate: expr) => {
        #[cfg(not(feature = "debug_enforcement_state"))]
        trace!("{}:\n{:#?}", function!(), $estate);
        #[cfg(feature = "debug_enforcement_state")]
        debug!("{}:\n{:#?}", function!(), $estate);
    };
}

/// Debug printer for Payload which uses hex encoded strings.
pub struct DebugPayload<'a>(pub &'a Payload);
impl<'a> core::fmt::Debug for DebugPayload<'a> {
    fn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
        match *self.0 {
            Payload::PubkeyHash(ref hash) => hex::format_hex(hash, f),
            Payload::ScriptHash(ref hash) => hex::format_hex(hash, f),
            Payload::WitnessProgram { version: ver, program: ref prog } => f
                .debug_struct("WitnessProgram")
                .field("version", &ver.to_u8())
                .field("program", &prog.to_hex())
                .finish(),
        }
    }
}

/// Debug printer for HTLCOutputInCommitment which doesn't have one.
pub struct DebugHTLCOutputInCommitment<'a>(pub &'a HTLCOutputInCommitment);
impl<'a> core::fmt::Debug for DebugHTLCOutputInCommitment<'a> {
    fn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
        f.debug_struct("HTLCOutputInCommitment")
            .field("offered", &self.0.offered)
            .field("amount_msat", &self.0.amount_msat)
            .field("cltv_expiry", &self.0.cltv_expiry)
            .field("payment_hash", &self.0.payment_hash.0[..].to_hex())
            .field("transaction_output_index", &self.0.transaction_output_index)
            .finish()
    }
}

/// Debug support for Vec<HTLCOutputInCommitment>
pub struct DebugVecHTLCOutputInCommitment<'a>(pub &'a Vec<HTLCOutputInCommitment>);
impl<'a> core::fmt::Debug for DebugVecHTLCOutputInCommitment<'a> {
    fn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
        f.debug_list().entries(self.0.iter().map(|vv| DebugHTLCOutputInCommitment(&vv))).finish()
    }
}

/// Debug printer for TxCreationKeys which doesn't have one.
pub struct DebugTxCreationKeys<'a>(pub &'a TxCreationKeys);
impl<'a> core::fmt::Debug for DebugTxCreationKeys<'a> {
    fn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
        f.debug_struct("TxCreationKeys")
            .field("per_commitment_point", &self.0.per_commitment_point)
            .field("revocation_key", &self.0.revocation_key)
            .field("broadcaster_htlc_key", &self.0.broadcaster_htlc_key)
            .field("countersignatory_htlc_key", &self.0.countersignatory_htlc_key)
            .field("broadcaster_delayed_payment_key", &self.0.broadcaster_delayed_payment_key)
            .finish()
    }
}

/// Debug printer for InMemorySigner which doesn't have one.
pub struct DebugInMemorySigner<'a>(pub &'a InMemorySigner);
impl<'a> core::fmt::Debug for DebugInMemorySigner<'a> {
    fn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
        f.debug_struct("InMemorySigner")
            .field("funding_key", &self.0.funding_key)
            .field("revocation_base_key", &self.0.revocation_base_key)
            .field("payment_key", &self.0.payment_key)
            .field("delayed_payment_base_key", &self.0.delayed_payment_base_key)
            .field("htlc_base_key", &self.0.htlc_base_key)
            .field("commitment_seed", &DebugBytes(&self.0.commitment_seed))
            .finish()
    }
}

/// Debug support for bytes
pub struct DebugBytes<'a>(pub &'a [u8]);
impl<'a> core::fmt::Debug for DebugBytes<'a> {
    fn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
        for i in self.0 {
            write!(f, "{:02x}", i)?;
        }
        Ok(())
    }
}

/// Debug support for Vec<Vec<u8>>
pub struct DebugVecVecU8<'a>(pub &'a Vec<Vec<u8>>);
impl<'a> core::fmt::Debug for DebugVecVecU8<'a> {
    fn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
        f.debug_list().entries(self.0.iter().map(|vv| DebugBytes(&vv[..]))).finish()
    }
}

/// Debug support for a two element witness stack
pub struct DebugWitness<'a>(pub &'a (Vec<u8>, Vec<u8>));
impl<'a> core::fmt::Debug for DebugWitness<'a> {
    fn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
        f.debug_tuple("Witness")
            .field(&DebugBytes(&self.0 .0))
            .field(&DebugBytes(&self.0 .1))
            .finish()
    }
}

/// Debug support for a collection of two-element witness stacks
pub struct DebugWitVec<'a>(pub &'a Vec<(Vec<u8>, Vec<u8>)>);
impl<'a> core::fmt::Debug for DebugWitVec<'a> {
    fn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
        f.debug_list().entries(self.0.iter().map(|ww| DebugWitness(ww))).finish()
    }
}

/// Return a debug string for a bitcoin::Script
pub fn script_debug(script: &Script, network: Network) -> String {
    format!(
        "script={} {}={}",
        script.to_hex(),
        network,
        match Address::from_script(script, network) {
            Some(addr) => addr.to_string(),
            None => "<bad-address>".to_string(),
        },
    )
}

/// Logs the arguments at debug level.
#[macro_export]
macro_rules! debug_vals {
    ( $($arg:tt)* ) => {
        if log::log_enabled!(log::Level::Debug) {
            debug!("{}: {}", short_function!(), vals_str!($($arg)*));
        }
    };
}

/// Logs the arguments at debug level.
#[macro_export]
macro_rules! debug_failed_vals {
    ( $($arg:tt)* ) => {
        if log::log_enabled!(log::Level::Debug) {
            debug!("{} failed: {}", short_function!(), vals_str!($($arg)*));
        }
    };
}

/// Return a scopeguard which debugs args on return unless disabled.
#[macro_export]
macro_rules! scoped_debug_return {
    ( $($arg:tt)* ) => {{
        let should_debug = true;
        scopeguard::guard(should_debug, |should_debug| {
            if should_debug {
                if log::log_enabled!(log::Level::Debug) {
                    debug!("{} failed: {}", containing_function!(), vals_str!($($arg)*),
                    );
                }
            }
        })
    }};
}