// Copyright 2015-2020 Parity Technologies (UK) Ltd.
// This file is part of OpenEthereum.

// OpenEthereum 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.

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

//! Spec deserialization.

use crate::spec::{Engine, Genesis, Params, State};
use serde_json::{self, Error};
use std::io::Read;

/// Fork spec definition
#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Deserialize)]
pub enum ForkSpec {
    EIP150,
    EIP158,
    Frontier,
    Homestead,
    Byzantium,
    Constantinople,
    ConstantinopleFix,
    Istanbul,
    EIP158ToByzantiumAt5,
    FrontierToHomesteadAt5,
    HomesteadToDaoAt5,
    HomesteadToEIP150At5,
    ByzantiumToConstantinopleAt5,
    ByzantiumToConstantinopleFixAt5,
    Berlin,
}

/// Spec deserialization.
#[derive(Debug, PartialEq, Deserialize)]
#[serde(deny_unknown_fields)]
#[serde(rename_all = "camelCase")]
pub struct Spec {
    /// Spec name.
    pub name: String,
    /// Special fork name.
    pub data_dir: Option<String>,
    /// Engine.
    pub engine: Engine,
    /// Spec params.
    pub params: Params,
    /// Genesis header.
    pub genesis: Genesis,
    /// Genesis state.
    pub accounts: State,
    /// Boot nodes.
    pub nodes: Option<Vec<String>>,
}

impl Spec {
    /// Loads test from json.
    pub fn load<R>(reader: R) -> Result<Self, Error>
    where
        R: Read,
    {
        serde_json::from_reader(reader)
    }
}

#[cfg(test)]
mod tests {
    use crate::spec::spec::Spec;
    use serde_json;

    #[test]
    fn should_error_on_unknown_fields() {
        let s = r#"{
		"name": "Morden",
		"dataDir": "morden",
		"engine": {
			"Ethash": {
				"params": {
					"minimumDifficulty": "0x020000",
					"difficultyBoundDivisor": "0x0800",
					"durationLimit": "0x0d",
					"homesteadTransition" : "0x",
					"daoHardforkTransition": "0xffffffffffffffff",
					"daoHardforkBeneficiary": "0x0000000000000000000000000000000000000000",
					"daoHardforkAccounts": []
				}
			}
		},
		"params": {
			"accountStartNonce": "0x0100000",
			"maximumExtraDataSize": "0x20",
			"minGasLimit": "0x1388",
			"networkID" : "0x2",
			"forkBlock": "0xffffffffffffffff",
			"forkCanonHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
			"gasLimitBoundDivisor": "0x20",
			"unknownField": "0x0"
		},
		"genesis": {
			"seal": {
				"ethereum": {
					"mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
					"nonce": "0x00006d6f7264656e"
				}
			},
			"difficulty": "0x20000",
			"author": "0x0000000000000000000000000000000000000000",
			"timestamp": "0x00",
			"parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
			"extraData": "0x",
			"gasLimit": "0x2fefd8"
		},
		"nodes": [
			"enode://b1217cbaa440e35ed471157123fe468e19e8b5ad5bedb4b1fdbcbdab6fb2f5ed3e95dd9c24a22a79fdb2352204cea207df27d92bfd21bfd41545e8b16f637499@104.44.138.37:30303"
		],
		"accounts": {
			"0000000000000000000000000000000000000001": { "balance": "1", "nonce": "1048576", "builtin": { "name": "ecrecover", "pricing": { "linear": { "base": 3000, "word": 0 } } } },
			"0000000000000000000000000000000000000002": { "balance": "1", "nonce": "1048576", "builtin": { "name": "sha256", "pricing": { "linear": { "base": 60, "word": 12 } } } },
			"0000000000000000000000000000000000000003": { "balance": "1", "nonce": "1048576", "builtin": { "name": "ripemd160", "pricing": { "linear": { "base": 600, "word": 120 } } } },
			"0000000000000000000000000000000000000004": { "balance": "1", "nonce": "1048576", "builtin": { "name": "identity", "pricing": { "linear": { "base": 15, "word": 3 } } } },
			"102e61f5d8f9bc71d0ad4a084df4e65e05ce0e1c": { "balance": "1606938044258990275541962092341162602522202993782792835301376", "nonce": "1048576" }
		}
		}"#;
        let result: Result<Spec, _> = serde_json::from_str(s);
        assert!(result.is_err());
    }

    #[test]
    fn spec_deserialization() {
        let s = r#"{
		"name": "Morden",
		"dataDir": "morden",
		"engine": {
			"Ethash": {
				"params": {
					"minimumDifficulty": "0x020000",
					"difficultyBoundDivisor": "0x0800",
					"durationLimit": "0x0d",
					"homesteadTransition" : "0x",
					"daoHardforkTransition": "0xffffffffffffffff",
					"daoHardforkBeneficiary": "0x0000000000000000000000000000000000000000",
					"daoHardforkAccounts": []
				}
			}
		},
		"params": {
			"accountStartNonce": "0x0100000",
			"maximumExtraDataSize": "0x20",
			"minGasLimit": "0x1388",
			"networkID" : "0x2",
			"forkBlock": "0xffffffffffffffff",
			"forkCanonHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
			"gasLimitBoundDivisor": "0x20"
		},
		"genesis": {
			"seal": {
				"ethereum": {
					"mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
					"nonce": "0x00006d6f7264656e"
				}
			},
			"difficulty": "0x20000",
			"author": "0x0000000000000000000000000000000000000000",
			"timestamp": "0x00",
			"parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
			"extraData": "0x",
			"gasLimit": "0x2fefd8"
		},
		"nodes": [
			"enode://b1217cbaa440e35ed471157123fe468e19e8b5ad5bedb4b1fdbcbdab6fb2f5ed3e95dd9c24a22a79fdb2352204cea207df27d92bfd21bfd41545e8b16f637499@104.44.138.37:30303"
		],
		"accounts": {
			"0000000000000000000000000000000000000001": {
				"balance": "1",
				"nonce": "1048576",
				"builtin": {
					"name": "ecrecover",
					"pricing": {
						"linear": {
							"base": 3000,
							"word": 0
						}
					}
				}
			},
			"0000000000000000000000000000000000000002": {
				"balance": "1",
				"nonce": "1048576",
				"builtin": {
					"name": "sha256",
					"pricing": {
						"linear": {
							"base": 60,
							"word": 12
						}
					}
				}
			},
			"0000000000000000000000000000000000000003": {
				"balance": "1",
				"nonce": "1048576",
				"builtin": {
					"name": "ripemd160",
					"pricing": {
						"linear": {
							"base": 600,
							"word": 120
						}
					}
				}
			},
			"0000000000000000000000000000000000000004": {
				"balance": "1",
				"nonce": "1048576",
				"builtin": {
					"name": "identity",
					"pricing": {
						"linear": {
							"base": 15,
							"word": 3
						}
					}
				}
			},
			"102e61f5d8f9bc71d0ad4a084df4e65e05ce0e1c": { "balance": "1606938044258990275541962092341162602522202993782792835301376", "nonce": "1048576" }
		}
		}"#;
        let _deserialized: Spec = serde_json::from_str(s).unwrap();
        // TODO: validate all fields
    }
}