/// A changeset containing [`crate`] structures typically persisted together.
#[cfg(feature = "miniscript")]
#[derive(Debug, Clone, PartialEq)]
#[cfg_attr(
    feature = "serde",
    derive(crate::serde::Deserialize, crate::serde::Serialize),
    serde(
        crate = "crate::serde",
        bound(
            deserialize = "A: Ord + crate::serde::Deserialize<'de>, K: Ord + crate::serde::Deserialize<'de>",
            serialize = "A: Ord + crate::serde::Serialize, K: Ord + crate::serde::Serialize",
        ),
    )
)]
pub struct CombinedChangeSet<K, A> {
    /// Changes to the [`LocalChain`](crate::local_chain::LocalChain).
    pub chain: crate::local_chain::ChangeSet,
    /// Changes to [`IndexedTxGraph`](crate::indexed_tx_graph::IndexedTxGraph).
    pub indexed_tx_graph:
        crate::indexed_tx_graph::ChangeSet<A, crate::indexer::keychain_txout::ChangeSet<K>>,
    /// Stores the network type of the transaction data.
    pub network: Option<bitcoin::Network>,
}

#[cfg(feature = "miniscript")]
impl<K, A> core::default::Default for CombinedChangeSet<K, A> {
    fn default() -> Self {
        Self {
            chain: core::default::Default::default(),
            indexed_tx_graph: core::default::Default::default(),
            network: None,
        }
    }
}

#[cfg(feature = "miniscript")]
impl<K: Ord, A: crate::Anchor> crate::Merge for CombinedChangeSet<K, A> {
    fn merge(&mut self, other: Self) {
        crate::Merge::merge(&mut self.chain, other.chain);
        crate::Merge::merge(&mut self.indexed_tx_graph, other.indexed_tx_graph);
        if other.network.is_some() {
            debug_assert!(
                self.network.is_none() || self.network == other.network,
                "network type must either be just introduced or remain the same"
            );
            self.network = other.network;
        }
    }

    fn is_empty(&self) -> bool {
        self.chain.is_empty() && self.indexed_tx_graph.is_empty() && self.network.is_none()
    }
}

#[cfg(feature = "miniscript")]
impl<K, A> From<crate::local_chain::ChangeSet> for CombinedChangeSet<K, A> {
    fn from(chain: crate::local_chain::ChangeSet) -> Self {
        Self {
            chain,
            ..Default::default()
        }
    }
}

#[cfg(feature = "miniscript")]
impl<K, A> From<crate::indexed_tx_graph::ChangeSet<A, crate::indexer::keychain_txout::ChangeSet<K>>>
    for CombinedChangeSet<K, A>
{
    fn from(
        indexed_tx_graph: crate::indexed_tx_graph::ChangeSet<
            A,
            crate::indexer::keychain_txout::ChangeSet<K>,
        >,
    ) -> Self {
        Self {
            indexed_tx_graph,
            ..Default::default()
        }
    }
}

#[cfg(feature = "miniscript")]
impl<K, A> From<crate::indexer::keychain_txout::ChangeSet<K>> for CombinedChangeSet<K, A> {
    fn from(indexer: crate::indexer::keychain_txout::ChangeSet<K>) -> Self {
        Self {
            indexed_tx_graph: crate::indexed_tx_graph::ChangeSet {
                indexer,
                ..Default::default()
            },
            ..Default::default()
        }
    }
}