// Copyright 2017-2018 Parity Technologies (UK) Ltd.
// This file is part of Substrate.

// Substrate 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.

// Substrate 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 Substrate.  If not, see <http://www.gnu.org/licenses/>.

//! The Substrate runtime. This can be compiled with #[no_std], ready for Wasm.

#![cfg_attr(not(feature = "std"), no_std)]

#[cfg(feature = "std")]
extern crate serde;

extern crate sr_std as rstd;
extern crate parity_codec as codec;
extern crate sr_primitives as runtime_primitives;
extern crate substrate_inherents as inherents;
extern crate substrate_consensus_aura_primitives as consensus_aura;

#[macro_use]
extern crate substrate_client as client;

#[macro_use]
extern crate srml_support as runtime_support;
#[macro_use]
extern crate parity_codec_derive;
extern crate sr_io as runtime_io;
#[macro_use]
extern crate sr_version as runtime_version;

#[cfg(test)]
#[macro_use]
extern crate hex_literal;
#[cfg(test)]
extern crate substrate_keyring as keyring;
#[cfg_attr(any(feature = "std", test), macro_use)]
extern crate substrate_primitives as primitives;

#[cfg(test)] extern crate substrate_executor;

#[cfg(feature = "std")] pub mod genesismap;
pub mod system;

use rstd::prelude::*;
use codec::{Encode, Decode};

use client::{runtime_api as client_api, block_builder::api as block_builder_api};
use runtime_primitives::{
	ApplyResult, Ed25519Signature, transaction_validity::TransactionValidity,
	traits::{
		BlindCheckable, BlakeTwo256, Block as BlockT, Extrinsic as ExtrinsicT,
		GetNodeBlockType, GetRuntimeBlockType
	}
};
use runtime_version::RuntimeVersion;
pub use primitives::hash::H256;
use primitives::{Ed25519AuthorityId, OpaqueMetadata};
#[cfg(any(feature = "std", test))]
use runtime_version::NativeVersion;
use consensus_aura::api as aura_api;
use inherents::{CheckInherentsResult, InherentData};

/// Test runtime version.
pub const VERSION: RuntimeVersion = RuntimeVersion {
	spec_name: create_runtime_str!("test"),
	impl_name: create_runtime_str!("parity-test"),
	authoring_version: 1,
	spec_version: 1,
	impl_version: 1,
	apis: RUNTIME_API_VERSIONS,
};

fn version() -> RuntimeVersion {
	VERSION
}

/// Native version.
#[cfg(any(feature = "std", test))]
pub fn native_version() -> NativeVersion {
	NativeVersion {
		runtime_version: VERSION,
		can_author_with: Default::default(),
	}
}

/// Calls in transactions.
#[derive(Clone, PartialEq, Eq, Encode, Decode)]
#[cfg_attr(feature = "std", derive(Debug))]
pub struct Transfer {
	pub from: AccountId,
	pub to: AccountId,
	pub amount: u64,
	pub nonce: u64,
}

/// Extrinsic for test-runtime.
#[derive(Clone, PartialEq, Eq, Encode, Decode)]
#[cfg_attr(feature = "std", derive(Debug))]
pub enum Extrinsic {
	AuthoritiesChange(Vec<Ed25519AuthorityId>),
	Transfer(Transfer, Ed25519Signature),
}

#[cfg(feature = "std")]
impl serde::Serialize for Extrinsic
{
	fn serialize<S>(&self, seq: S) -> Result<S::Ok, S::Error> where S: ::serde::Serializer {
		self.using_encoded(|bytes| seq.serialize_bytes(bytes))
	}
}

impl BlindCheckable for Extrinsic {
	type Checked = Self;

	fn check(self) -> Result<Self, &'static str> {
		match self {
			Extrinsic::AuthoritiesChange(new_auth) => Ok(Extrinsic::AuthoritiesChange(new_auth)),
			Extrinsic::Transfer(transfer, signature) => {
				if ::runtime_primitives::verify_encoded_lazy(&signature, &transfer, &transfer.from) {
					Ok(Extrinsic::Transfer(transfer, signature))
				} else {
					Err("bad signature")
				}
			},
		}
	}
}

impl ExtrinsicT for Extrinsic {
	fn is_signed(&self) -> Option<bool> {
		Some(true)
	}
}

impl Extrinsic {
	pub fn transfer(&self) -> &Transfer {
		match self {
			Extrinsic::Transfer(ref transfer, _) => transfer,
			_ => panic!("cannot convert to transfer ref"),
		}
	}
}

/// An identifier for an account on this system.
pub type AccountId = H256;
/// A simple hash type for all our hashing.
pub type Hash = H256;
/// The block number type used in this runtime.
pub type BlockNumber = u64;
/// Index of a transaction.
pub type Index = u64;
/// The item of a block digest.
pub type DigestItem = runtime_primitives::generic::DigestItem<H256, Ed25519AuthorityId>;
/// The digest of a block.
pub type Digest = runtime_primitives::generic::Digest<DigestItem>;
/// A test block.
pub type Block = runtime_primitives::generic::Block<Header, Extrinsic>;
/// A test block's header.
pub type Header = runtime_primitives::generic::Header<BlockNumber, BlakeTwo256, DigestItem>;

/// Run whatever tests we have.
pub fn run_tests(mut input: &[u8]) -> Vec<u8> {
	use runtime_io::print;

	print("run_tests...");
	let block = Block::decode(&mut input).unwrap();
	print("deserialised block.");
	let stxs = block.extrinsics.iter().map(Encode::encode).collect::<Vec<_>>();
	print("reserialised transactions.");
	[stxs.len() as u8].encode()
}

/// Changes trie configuration (optionally) used in tests.
pub fn changes_trie_config() -> primitives::ChangesTrieConfiguration {
	primitives::ChangesTrieConfiguration {
		digest_interval: 4,
		digest_levels: 2,
	}
}

decl_runtime_apis! {
	pub trait TestAPI {
		fn balance_of(id: AccountId) -> u64;
		/// A benchmkark function that adds one to the given value and returns the result.
		fn benchmark_add_one(val: &u64) -> u64;
		/// A benchmark function that adds one to each value in the given vector and returns the
		/// result.
		fn benchmark_vector_add_one(vec: &Vec<u64>) -> Vec<u64>;
	}
}

pub struct Runtime;

impl GetNodeBlockType for Runtime {
	type NodeBlock = Block;
}

impl GetRuntimeBlockType for Runtime {
	type RuntimeBlock = Block;
}

impl_runtime_apis! {
	impl client_api::Core<Block> for Runtime {
		fn version() -> RuntimeVersion {
			version()
		}

		fn authorities() -> Vec<Ed25519AuthorityId> {
			system::authorities()
		}

		fn execute_block(block: Block) {
			system::execute_block(block)
		}

		fn initialise_block(header: &<Block as BlockT>::Header) {
			system::initialise_block(header)
		}
	}

	impl client_api::Metadata<Block> for Runtime {
		fn metadata() -> OpaqueMetadata {
			unimplemented!()
		}
	}

	impl client_api::TaggedTransactionQueue<Block> for Runtime {
		fn validate_transaction(utx: <Block as BlockT>::Extrinsic) -> TransactionValidity {
			system::validate_transaction(utx)
		}
	}

	impl block_builder_api::BlockBuilder<Block> for Runtime {
		fn apply_extrinsic(extrinsic: <Block as BlockT>::Extrinsic) -> ApplyResult {
			system::execute_transaction(extrinsic)
		}

		fn finalise_block() -> <Block as BlockT>::Header {
			system::finalise_block()
		}

		fn inherent_extrinsics(_data: InherentData) -> Vec<<Block as BlockT>::Extrinsic> {
			unimplemented!()
		}

		fn check_inherents(_block: Block, _data: InherentData) -> CheckInherentsResult {
			CheckInherentsResult::new()
		}

		fn random_seed() -> <Block as BlockT>::Hash {
			unimplemented!()
		}
	}

	impl self::TestAPI<Block> for Runtime {
		fn balance_of(id: AccountId) -> u64 {
			system::balance_of(id)
		}

		fn benchmark_add_one(val: &u64) -> u64 {
			val + 1
		}

		fn benchmark_vector_add_one(vec: &Vec<u64>) -> Vec<u64> {
			let mut vec = vec.clone();
			vec.iter_mut().for_each(|v| *v += 1);
			vec
		}
	}

	impl aura_api::AuraApi<Block> for Runtime {
		fn slot_duration() -> u64 { 1 }
	}
}