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use itertools::Itertools;
use pallas_machines::{CodecError, DecodePayload, EncodePayload, PayloadEncoder};
use std::{collections::HashMap, fmt::Debug};

pub const TESTNET_MAGIC: u64 = 1097911063;
pub const MAINNET_MAGIC: u64 = 764824073;

#[derive(Debug, Clone)]
pub struct VersionTable<T>
where
    T: Debug + Clone + EncodePayload + DecodePayload,
{
    pub values: HashMap<u64, T>,
}

impl<T> EncodePayload for VersionTable<T>
where
    T: Debug + Clone + EncodePayload + DecodePayload,
{
    fn encode_payload(&self, e: &mut PayloadEncoder) -> Result<(), Box<dyn std::error::Error>> {
        e.map(self.values.len() as u64)?;

        for key in self.values.keys().sorted() {
            e.u64(*key)?;
            self.values[key].encode_payload(e)?;
        }

        Ok(())
    }
}

pub type NetworkMagic = u64;

pub type VersionNumber = u64;

#[derive(Debug)]
pub enum RefuseReason {
    VersionMismatch(Vec<VersionNumber>),
    HandshakeDecodeError(VersionNumber, String),
    Refused(VersionNumber, String),
}

impl EncodePayload for RefuseReason {
    fn encode_payload(&self, e: &mut PayloadEncoder) -> Result<(), Box<dyn std::error::Error>> {
        match self {
            RefuseReason::VersionMismatch(versions) => {
                e.array(2)?;
                e.u16(0)?;
                e.array(versions.len() as u64)?;
                for v in versions.iter() {
                    e.u64(*v)?;
                }

                Ok(())
            }
            RefuseReason::HandshakeDecodeError(version, msg) => {
                e.array(3)?;
                e.u16(1)?;
                e.u64(*version)?;
                e.str(msg)?;

                Ok(())
            }
            RefuseReason::Refused(version, msg) => {
                e.array(3)?;
                e.u16(2)?;
                e.u64(*version)?;
                e.str(msg)?;

                Ok(())
            }
        }
    }
}

impl DecodePayload for RefuseReason {
    fn decode_payload(
        d: &mut pallas_machines::PayloadDecoder,
    ) -> Result<Self, Box<dyn std::error::Error>> {
        d.array()?;

        match d.u16()? {
            0 => {
                let versions = d.array_iter::<u64>()?;
                let versions = versions.try_collect()?;
                Ok(RefuseReason::VersionMismatch(versions))
            }
            1 => {
                let version = d.u64()?;
                let msg = d.str()?;

                Ok(RefuseReason::HandshakeDecodeError(version, msg.to_string()))
            }
            2 => {
                let version = d.u64()?;
                let msg = d.str()?;

                Ok(RefuseReason::Refused(version, msg.to_string()))
            }
            x => Err(Box::new(CodecError::BadLabel(x))),
        }
    }
}