use anyhow::Context;
use bdk::electrum_client::HeaderNotification;
use serde::{Deserialize, Serialize};
use std::convert::{TryFrom, TryInto};
use std::ops::Add;

/// Represent a block height, or block number, expressed in absolute block
/// count. E.g. The transaction was included in block #655123, 655123 block
/// after the genesis block.
#[derive(Debug, Copy, Clone, PartialEq, Eq, Ord, PartialOrd, Serialize, Deserialize)]
#[serde(transparent)]
pub struct BlockHeight(u32);

impl From<BlockHeight> for u32 {
    fn from(height: BlockHeight) -> Self {
        height.0
    }
}

impl TryFrom<HeaderNotification> for BlockHeight {
    type Error = anyhow::Error;

    fn try_from(value: HeaderNotification) -> Result<Self, Self::Error> {
        Ok(Self(
            value
                .height
                .try_into()
                .context("Failed to fit usize into u32")?,
        ))
    }
}

impl Add<u32> for BlockHeight {
    type Output = BlockHeight;
    fn add(self, rhs: u32) -> Self::Output {
        BlockHeight(self.0 + rhs)
    }
}

#[derive(Serialize, Debug, Clone, Copy, PartialEq, Eq)]
pub enum ExpiredTimelocks {
    None { blocks_left: u32 },
    Cancel { blocks_left: u32 },
    Punish,
}