// 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/>.

use cache::CacheConfig;
use db::migrate;
use dir::{helpers::replace_home, DatabaseDirectories};
use ethcore::{
    client::{BlockId, ClientConfig, DatabaseCompactionProfile, Mode, VMType, VerifierType},
    miner::{Penalization, PendingSet},
};
use ethereum_types::{clean_0x, Address, U256};
use ethkey::Password;
use journaldb::Algorithm;
use miner::pool::PrioritizationStrategy;
use std::{
    collections::HashSet,
    fs::File,
    io,
    io::{BufRead, BufReader, Write},
    time::Duration,
};
use sync::{self, validate_node_url};
use upgrade::{upgrade, upgrade_data_paths};

pub fn to_duration(s: &str) -> Result<Duration, String> {
    to_seconds(s).map(Duration::from_secs)
}

fn to_seconds(s: &str) -> Result<u64, String> {
    let bad = |_| {
        format!(
            "{}: Invalid duration given. See openethereum --help for more information.",
            s
        )
    };

    match s {
        "twice-daily" => Ok(12 * 60 * 60),
        "half-hourly" => Ok(30 * 60),
        "1second" | "1 second" | "second" => Ok(1),
        "1minute" | "1 minute" | "minute" => Ok(60),
        "hourly" | "1hour" | "1 hour" | "hour" => Ok(60 * 60),
        "daily" | "1day" | "1 day" | "day" => Ok(24 * 60 * 60),
        x if x.ends_with("seconds") => x[0..x.len() - 7].trim().parse().map_err(bad),
        x if x.ends_with("minutes") => x[0..x.len() - 7]
            .trim()
            .parse::<u64>()
            .map_err(bad)
            .map(|x| x * 60),
        x if x.ends_with("hours") => x[0..x.len() - 5]
            .trim()
            .parse::<u64>()
            .map_err(bad)
            .map(|x| x * 60 * 60),
        x if x.ends_with("days") => x[0..x.len() - 4]
            .trim()
            .parse::<u64>()
            .map_err(bad)
            .map(|x| x * 24 * 60 * 60),
        x => x.trim().parse().map_err(bad),
    }
}

pub fn to_mode(s: &str, timeout: u64, alarm: u64) -> Result<Mode, String> {
    match s {
        "active" => Ok(Mode::Active),
        "passive" => Ok(Mode::Passive(
            Duration::from_secs(timeout),
            Duration::from_secs(alarm),
        )),
        "dark" => Ok(Mode::Dark(Duration::from_secs(timeout))),
        "offline" => Ok(Mode::Off),
        _ => Err(format!(
            "{}: Invalid value for --mode. Must be one of active, passive, dark or offline.",
            s
        )),
    }
}

pub fn to_block_id(s: &str) -> Result<BlockId, String> {
    if s == "latest" {
        Ok(BlockId::Latest)
    } else if let Ok(num) = s.parse() {
        Ok(BlockId::Number(num))
    } else if let Ok(hash) = s.parse() {
        Ok(BlockId::Hash(hash))
    } else {
        Err("Invalid block.".into())
    }
}

pub fn to_u256(s: &str) -> Result<U256, String> {
    if let Ok(decimal) = U256::from_dec_str(s) {
        Ok(decimal)
    } else {
        clean_0x(s)
            .parse()
            .map_err(|_| format!("Invalid numeric value: {}", s))
    }
}

pub fn to_pending_set(s: &str) -> Result<PendingSet, String> {
    match s {
        "cheap" => Ok(PendingSet::AlwaysQueue),
        "strict" => Ok(PendingSet::AlwaysSealing),
        "lenient" => Ok(PendingSet::SealingOrElseQueue),
        other => Err(format!("Invalid pending set value: {:?}", other)),
    }
}

pub fn to_queue_strategy(s: &str) -> Result<PrioritizationStrategy, String> {
    match s {
        "gas_price" => Ok(PrioritizationStrategy::GasPriceOnly),
        other => Err(format!("Invalid queue strategy: {}", other)),
    }
}

pub fn to_queue_penalization(time: Option<u64>) -> Result<Penalization, String> {
    Ok(match time {
        Some(threshold_ms) => Penalization::Enabled {
            offend_threshold: Duration::from_millis(threshold_ms),
        },
        None => Penalization::Disabled,
    })
}

pub fn to_address(s: Option<String>) -> Result<Address, String> {
    match s {
        Some(ref a) => clean_0x(a)
            .parse()
            .map_err(|_| format!("Invalid address: {:?}", a)),
        None => Ok(Address::default()),
    }
}

pub fn to_addresses(s: &Option<String>) -> Result<Vec<Address>, String> {
    match *s {
        Some(ref adds) if !adds.is_empty() => adds
            .split(',')
            .map(|a| {
                clean_0x(a)
                    .parse()
                    .map_err(|_| format!("Invalid address: {:?}", a))
            })
            .collect(),
        _ => Ok(Vec::new()),
    }
}

/// Tries to parse string as a price.
pub fn to_price(s: &str) -> Result<f32, String> {
    s.parse::<f32>().map_err(|_| {
        format!(
            "Invalid transaction price {:?} given. Must be a decimal number.",
            s
        )
    })
}

pub fn join_set(set: Option<&HashSet<String>>) -> Option<String> {
    set.map(|s| {
        s.iter()
            .map(|s| s.as_str())
            .collect::<Vec<&str>>()
            .join(",")
    })
}

/// Flush output buffer.
pub fn flush_stdout() {
    io::stdout().flush().expect("stdout is flushable; qed");
}

/// Formats and returns parity ipc path.
pub fn parity_ipc_path(base: &str, path: &str, shift: u16) -> String {
    let mut path = path.to_owned();
    if shift != 0 {
        path = path.replace("jsonrpc.ipc", &format!("jsonrpc-{}.ipc", shift));
    }
    replace_home(base, &path)
}

/// Validates and formats bootnodes option.
pub fn to_bootnodes(bootnodes: &Option<String>) -> Result<Vec<String>, String> {
    match *bootnodes {
        Some(ref x) if !x.is_empty() => x
            .split(',')
            .map(|s| match validate_node_url(s).map(Into::into) {
                None => Ok(s.to_owned()),
                Some(sync::ErrorKind::AddressResolve(_)) => {
                    Err(format!("Failed to resolve hostname of a boot node: {}", s))
                }
                Some(_) => Err(format!(
                    "Invalid node address format given for a boot node: {}",
                    s
                )),
            })
            .collect(),
        Some(_) => Ok(vec![]),
        None => Ok(vec![]),
    }
}

#[cfg(test)]
pub fn default_network_config() -> ::sync::NetworkConfiguration {
    use super::network::IpFilter;
    use sync::NetworkConfiguration;
    NetworkConfiguration {
        config_path: Some(replace_home(&::dir::default_data_path(), "$BASE/network")),
        net_config_path: None,
        listen_address: Some("0.0.0.0:30303".into()),
        public_address: None,
        udp_port: None,
        nat_enabled: true,
        discovery_enabled: true,
        boot_nodes: Vec::new(),
        use_secret: None,
        max_peers: 50,
        min_peers: 25,
        snapshot_peers: 0,
        max_pending_peers: 64,
        ip_filter: IpFilter::default(),
        reserved_nodes: Vec::new(),
        allow_non_reserved: true,
        client_version: ::parity_version::version(),
    }
}

pub fn to_client_config(
    cache_config: &CacheConfig,
    spec_name: String,
    mode: Mode,
    tracing: bool,
    fat_db: bool,
    compaction: DatabaseCompactionProfile,
    vm_type: VMType,
    name: String,
    pruning: Algorithm,
    pruning_history: u64,
    pruning_memory: usize,
    check_seal: bool,
    max_round_blocks_to_import: usize,
) -> ClientConfig {
    let mut client_config = ClientConfig::default();

    let mb = 1024 * 1024;
    // in bytes
    client_config.blockchain.max_cache_size = cache_config.blockchain() as usize * mb;
    // in bytes
    client_config.blockchain.pref_cache_size = cache_config.blockchain() as usize * 3 / 4 * mb;
    // db cache size, in megabytes
    client_config.db_cache_size = Some(cache_config.db_cache_size() as usize);
    // db queue cache size, in bytes
    client_config.queue.max_mem_use = cache_config.queue() as usize * mb;
    // in bytes
    client_config.tracing.max_cache_size = cache_config.traces() as usize * mb;
    // in bytes
    client_config.tracing.pref_cache_size = cache_config.traces() as usize * 3 / 4 * mb;
    // in bytes
    client_config.state_cache_size = cache_config.state() as usize * mb;
    // in bytes
    client_config.jump_table_size = cache_config.jump_tables() as usize * mb;
    // in bytes
    client_config.history_mem = pruning_memory * mb;

    client_config.mode = mode;
    client_config.tracing.enabled = tracing;
    client_config.fat_db = fat_db;
    client_config.pruning = pruning;
    client_config.history = pruning_history;
    client_config.db_compaction = compaction;
    client_config.vm_type = vm_type;
    client_config.name = name;
    client_config.verifier_type = if check_seal {
        VerifierType::Canon
    } else {
        VerifierType::CanonNoSeal
    };
    client_config.spec_name = spec_name;
    client_config.max_round_blocks_to_import = max_round_blocks_to_import;
    client_config
}

pub fn execute_upgrades(
    base_path: &str,
    dirs: &DatabaseDirectories,
    pruning: Algorithm,
    compaction_profile: &DatabaseCompactionProfile,
) -> Result<(), String> {
    upgrade_data_paths(base_path, dirs, pruning);

    match upgrade(&dirs.path) {
        Ok(upgrades_applied) if upgrades_applied > 0 => {
            debug!("Executed {} upgrade scripts - ok", upgrades_applied);
        }
        Err(e) => {
            return Err(format!("Error upgrading OpenEthereum data: {:?}", e));
        }
        _ => {}
    }

    let client_path = dirs.db_path(pruning);
    migrate(&client_path, compaction_profile).map_err(|e| format!("{}", e))
}

/// Prompts user asking for password.
pub fn password_prompt() -> Result<Password, String> {
    use rpassword::read_password;
    const STDIN_ERROR: &'static str = "Unable to ask for password on non-interactive terminal.";

    println!("Please note that password is NOT RECOVERABLE.");
    print!("Type password: ");
    flush_stdout();

    let password = read_password().map_err(|_| STDIN_ERROR.to_owned())?.into();

    print!("Repeat password: ");
    flush_stdout();

    let password_repeat = read_password().map_err(|_| STDIN_ERROR.to_owned())?.into();

    if password != password_repeat {
        return Err("Passwords do not match!".into());
    }

    Ok(password)
}

/// Read a password from password file.
pub fn password_from_file(path: String) -> Result<Password, String> {
    let passwords = passwords_from_files(&[path])?;
    // use only first password from the file
    passwords
        .get(0)
        .map(Password::clone)
        .ok_or_else(|| "Password file seems to be empty.".to_owned())
}

/// Reads passwords from files. Treats each line as a separate password.
pub fn passwords_from_files(files: &[String]) -> Result<Vec<Password>, String> {
    let passwords = files.iter().map(|filename| {
		let file = File::open(filename).map_err(|_| format!("{} Unable to read password file. Ensure it exists and permissions are correct.", filename))?;
		let reader = BufReader::new(&file);
		let lines = reader.lines()
			.filter_map(|l| l.ok())
			.map(|pwd| pwd.trim().to_owned().into())
			.collect::<Vec<Password>>();
		Ok(lines)
	}).collect::<Result<Vec<Vec<Password>>, String>>();
    Ok(passwords?.into_iter().flat_map(|x| x).collect())
}

#[cfg(test)]
mod tests {
    use super::{
        join_set, password_from_file, to_address, to_addresses, to_block_id, to_bootnodes,
        to_duration, to_mode, to_pending_set, to_price, to_u256,
    };
    use ethcore::{
        client::{BlockId, Mode},
        miner::PendingSet,
    };
    use ethereum_types::U256;
    use ethkey::Password;
    use std::{collections::HashSet, fs::File, io::Write, time::Duration};
    use tempdir::TempDir;

    #[test]
    fn test_to_duration() {
        assert_eq!(
            to_duration("twice-daily").unwrap(),
            Duration::from_secs(12 * 60 * 60)
        );
        assert_eq!(
            to_duration("half-hourly").unwrap(),
            Duration::from_secs(30 * 60)
        );
        assert_eq!(to_duration("1second").unwrap(), Duration::from_secs(1));
        assert_eq!(to_duration("2seconds").unwrap(), Duration::from_secs(2));
        assert_eq!(to_duration("15seconds").unwrap(), Duration::from_secs(15));
        assert_eq!(to_duration("1minute").unwrap(), Duration::from_secs(1 * 60));
        assert_eq!(
            to_duration("2minutes").unwrap(),
            Duration::from_secs(2 * 60)
        );
        assert_eq!(
            to_duration("15minutes").unwrap(),
            Duration::from_secs(15 * 60)
        );
        assert_eq!(to_duration("hourly").unwrap(), Duration::from_secs(60 * 60));
        assert_eq!(
            to_duration("daily").unwrap(),
            Duration::from_secs(24 * 60 * 60)
        );
        assert_eq!(
            to_duration("1hour").unwrap(),
            Duration::from_secs(1 * 60 * 60)
        );
        assert_eq!(
            to_duration("2hours").unwrap(),
            Duration::from_secs(2 * 60 * 60)
        );
        assert_eq!(
            to_duration("15hours").unwrap(),
            Duration::from_secs(15 * 60 * 60)
        );
        assert_eq!(
            to_duration("1day").unwrap(),
            Duration::from_secs(1 * 24 * 60 * 60)
        );
        assert_eq!(
            to_duration("2days").unwrap(),
            Duration::from_secs(2 * 24 * 60 * 60)
        );
        assert_eq!(
            to_duration("15days").unwrap(),
            Duration::from_secs(15 * 24 * 60 * 60)
        );
        assert_eq!(
            to_duration("15 days").unwrap(),
            Duration::from_secs(15 * 24 * 60 * 60)
        );
        assert_eq!(to_duration("2  seconds").unwrap(), Duration::from_secs(2));
    }

    #[test]
    fn test_to_mode() {
        assert_eq!(to_mode("active", 0, 0).unwrap(), Mode::Active);
        assert_eq!(
            to_mode("passive", 10, 20).unwrap(),
            Mode::Passive(Duration::from_secs(10), Duration::from_secs(20))
        );
        assert_eq!(
            to_mode("dark", 20, 30).unwrap(),
            Mode::Dark(Duration::from_secs(20))
        );
        assert!(to_mode("other", 20, 30).is_err());
    }

    #[test]
    fn test_to_block_id() {
        assert_eq!(to_block_id("latest").unwrap(), BlockId::Latest);
        assert_eq!(to_block_id("0").unwrap(), BlockId::Number(0));
        assert_eq!(to_block_id("2").unwrap(), BlockId::Number(2));
        assert_eq!(to_block_id("15").unwrap(), BlockId::Number(15));
        assert_eq!(
            to_block_id("9fc84d84f6a785dc1bd5abacfcf9cbdd3b6afb80c0f799bfb2fd42c44a0c224e")
                .unwrap(),
            BlockId::Hash(
                "9fc84d84f6a785dc1bd5abacfcf9cbdd3b6afb80c0f799bfb2fd42c44a0c224e"
                    .parse()
                    .unwrap()
            )
        );
    }

    #[test]
    fn test_to_u256() {
        assert_eq!(to_u256("0").unwrap(), U256::from(0));
        assert_eq!(to_u256("11").unwrap(), U256::from(11));
        assert_eq!(to_u256("0x11").unwrap(), U256::from(17));
        assert!(to_u256("u").is_err())
    }

    #[test]
    fn test_pending_set() {
        assert_eq!(to_pending_set("cheap").unwrap(), PendingSet::AlwaysQueue);
        assert_eq!(to_pending_set("strict").unwrap(), PendingSet::AlwaysSealing);
        assert_eq!(
            to_pending_set("lenient").unwrap(),
            PendingSet::SealingOrElseQueue
        );
        assert!(to_pending_set("othe").is_err());
    }

    #[test]
    fn test_to_address() {
        assert_eq!(
            to_address(Some("0xD9A111feda3f362f55Ef1744347CDC8Dd9964a41".into())).unwrap(),
            "D9A111feda3f362f55Ef1744347CDC8Dd9964a41".parse().unwrap()
        );
        assert_eq!(
            to_address(Some("D9A111feda3f362f55Ef1744347CDC8Dd9964a41".into())).unwrap(),
            "D9A111feda3f362f55Ef1744347CDC8Dd9964a41".parse().unwrap()
        );
        assert_eq!(to_address(None).unwrap(), Default::default());
    }

    #[test]
    fn test_to_addresses() {
        let addresses = to_addresses(&Some(
            "0xD9A111feda3f362f55Ef1744347CDC8Dd9964a41,D9A111feda3f362f55Ef1744347CDC8Dd9964a42"
                .into(),
        ))
        .unwrap();
        assert_eq!(
            addresses,
            vec![
                "D9A111feda3f362f55Ef1744347CDC8Dd9964a41".parse().unwrap(),
                "D9A111feda3f362f55Ef1744347CDC8Dd9964a42".parse().unwrap(),
            ]
        );
    }

    #[test]
    fn test_password() {
        let tempdir = TempDir::new("").unwrap();
        let path = tempdir.path().join("file");
        let mut file = File::create(&path).unwrap();
        file.write_all(b"a bc ").unwrap();
        assert_eq!(
            password_from_file(path.to_str().unwrap().into())
                .unwrap()
                .as_bytes(),
            b"a bc"
        );
    }

    #[test]
    fn test_password_multiline() {
        let tempdir = TempDir::new("").unwrap();
        let path = tempdir.path().join("file");
        let mut file = File::create(path.as_path()).unwrap();
        file.write_all(
            br#"    password with trailing whitespace
those passwords should be
ignored
but the first password is trimmed

"#,
        )
        .unwrap();
        assert_eq!(
            password_from_file(path.to_str().unwrap().into()).unwrap(),
            Password::from("password with trailing whitespace")
        );
    }

    #[test]
    fn test_to_price() {
        assert_eq!(to_price("1").unwrap(), 1.0);
        assert_eq!(to_price("2.3").unwrap(), 2.3);
        assert_eq!(to_price("2.33").unwrap(), 2.33);
    }

    #[test]
    fn test_to_bootnodes() {
        let one_bootnode = "enode://e731347db0521f3476e6bbbb83375dcd7133a1601425ebd15fd10f3835fd4c304fba6282087ca5a0deeafadf0aa0d4fd56c3323331901c1f38bd181c283e3e35@128.199.55.137:30303";
        let two_bootnodes = "enode://e731347db0521f3476e6bbbb83375dcd7133a1601425ebd15fd10f3835fd4c304fba6282087ca5a0deeafadf0aa0d4fd56c3323331901c1f38bd181c283e3e35@128.199.55.137:30303,enode://e731347db0521f3476e6bbbb83375dcd7133a1601425ebd15fd10f3835fd4c304fba6282087ca5a0deeafadf0aa0d4fd56c3323331901c1f38bd181c283e3e35@128.199.55.137:30303";

        assert_eq!(to_bootnodes(&Some("".into())), Ok(vec![]));
        assert_eq!(to_bootnodes(&None), Ok(vec![]));
        assert_eq!(
            to_bootnodes(&Some(one_bootnode.into())),
            Ok(vec![one_bootnode.into()])
        );
        assert_eq!(
            to_bootnodes(&Some(two_bootnodes.into())),
            Ok(vec![one_bootnode.into(), one_bootnode.into()])
        );
    }

    #[test]
    fn test_join_set() {
        let mut test_set = HashSet::new();
        test_set.insert("0x1111111111111111111111111111111111111111".to_string());
        test_set.insert("0x0000000000000000000000000000000000000000".to_string());

        let res = join_set(Some(&test_set)).unwrap();

        assert!(
			res == "0x1111111111111111111111111111111111111111,0x0000000000000000000000000000000000000000"
			||
			res == "0x0000000000000000000000000000000000000000,0x1111111111111111111111111111111111111111"
		);
    }
}