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    // Copyright 2015-2017 Parity Technologies (UK) Ltd.
    // This file is part of Parity.

    // Parity is free software: you can redistribute it and/or modify
    // it under the terms of the GNU General Public License as published by
    // the Free Software Foundation, either version 3 of the License, or
    // (at your option) any later version.

    // Parity is distributed in the hope that it will be useful,
    // but WITHOUT ANY WARRANTY; without even the implied warranty of
    // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    // GNU General Public License for more details.

    // You should have received a copy of the GNU General Public License
    // along with Parity.  If not, see <http://www.gnu.org/licenses/>.

    //! Diff between two accounts.

    use std::cmp::*;
    use std::fmt;
    use std::collections::BTreeMap;
    use util::{U256, H256, Uint, Bytes};
    use ipc::binary::BinaryConvertable;

    #[derive(Debug, PartialEq, Eq, Clone)]
    #[cfg_attr(feature = "ipc", binary)]
    /// Diff type for specifying a change (or not).
    pub enum Diff<T> where T: Eq + BinaryConvertable {
    	/// Both sides are the same.
    	Same,
    	/// Left (pre, source) side doesn't include value, right side (post, destination) does.
    	Born(T),
    	/// Both sides include data; it chaged value between them.
    	Changed(T, T),
    	/// Left (pre, source) side does include value, right side (post, destination) does not.
    	Died(T),
    }

    impl<T> Diff<T> where T: Eq + BinaryConvertable {
    	/// Construct new object with given `pre` and `post`.
    	pub fn new(pre: T, post: T) -> Self { if pre == post { Diff::Same } else { Diff::Changed(pre, post) } }

    	/// Get the before value, if there is one.
    	pub fn pre(&self) -> Option<&T> { match *self { Diff::Died(ref x) | Diff::Changed(ref x, _) => Some(x), _ => None } }

    	/// Get the after value, if there is one.
    	pub fn post(&self) -> Option<&T> { match *self { Diff::Born(ref x) | Diff::Changed(_, ref x) => Some(x), _ => None } }

    	/// Determine whether there was a change or not.
    	pub fn is_same(&self) -> bool { match *self { Diff::Same => true, _ => false }}
    }

    #[derive(Debug, PartialEq, Eq, Clone)]
    #[cfg_attr(feature = "ipc", binary)]
    /// Account diff.
    pub struct AccountDiff {
    	/// Change in balance, allowed to be `Diff::Same`.
    	pub balance: Diff<U256>,
    	/// Change in nonce, allowed to be `Diff::Same`.
    	pub nonce: Diff<U256>,					// Allowed to be Same
    	/// Change in code, allowed to be `Diff::Same`.
    	pub code: Diff<Bytes>,					// Allowed to be Same
    	/// Change in storage, values are not allowed to be `Diff::Same`.
    	pub storage: BTreeMap<H256, Diff<H256>>,
    }

    #[derive(Debug, PartialEq, Eq, Clone)]
    #[cfg_attr(feature = "ipc", binary)]
    /// Change in existance type.
    // TODO: include other types of change.
    pub enum Existance {
    	/// Item came into existance.
    	Born,
    	/// Item stayed in existance.
    	Alive,
    	/// Item went out of existance.
    	Died,
    }

    impl fmt::Display for Existance {
    	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    		match *self {
    			Existance::Born => write!(f, "+++")?,
    			Existance::Alive => write!(f, "***")?,
    			Existance::Died => write!(f, "XXX")?,
    		}
    		Ok(())
    	}
    }

    impl AccountDiff {
    	/// Get `Existance` projection.
    	pub fn existance(&self) -> Existance {
    		match self.balance {
    			Diff::Born(_) => Existance::Born,
    			Diff::Died(_) => Existance::Died,
    			_ => Existance::Alive,
    		}
    	}
    }

    // TODO: refactor into something nicer.
    fn interpreted_hash(u: &H256) -> String {
    	if u <= &H256::from(0xffffffff) {
    		format!("{} = 0x{:x}", U256::from(&**u).low_u32(), U256::from(&**u).low_u32())
    	} else if u <= &H256::from(u64::max_value()) {
    		format!("{} = 0x{:x}", U256::from(&**u).low_u64(), U256::from(&**u).low_u64())
    //	} else if u <= &H256::from("0xffffffffffffffffffffffffffffffffffffffff") {
    //		format!("@{}", Address::from(u))
    	} else {
    		format!("#{}", u)
    	}
    }

    impl fmt::Display for AccountDiff {
    	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    		use util::bytes::ToPretty;

    		match self.nonce {
    			Diff::Born(ref x) => write!(f, "  non {}", x)?,
    			Diff::Changed(ref pre, ref post) => write!(f, "#{} ({} {} {})", post, pre, if pre > post {"-"} else {"+"}, *max(pre, post) - *	min(pre, post))?,
    			_ => {},
    		}
    		match self.balance {
    			Diff::Born(ref x) => write!(f, "  bal {}", x)?,
    			Diff::Changed(ref pre, ref post) => write!(f, "${} ({} {} {})", post, pre, if pre > post {"-"} else {"+"}, *max(pre, post) - *min(pre, post))?,
    			_ => {},
    		}
    		if let Diff::Born(ref x) = self.code {
    			write!(f, "  code {}", x.pretty())?;
    		}
    		write!(f, "\n")?;
    		for (k, dv) in &self.storage {
    			match *dv {
    				Diff::Born(ref v) => write!(f, "    +  {} => {}\n", interpreted_hash(k), interpreted_hash(v))?,
    				Diff::Changed(ref pre, ref post) => write!(f, "    *  {} => {} (was {})\n", interpreted_hash(k), interpreted_hash(post), interpreted_hash(pre))?,
    				Diff::Died(_) => write!(f, "    X  {}\n", interpreted_hash(k))?,
    				_ => {},
    			}
    		}
    		Ok(())
    	}
    }

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