// 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/>.

//! Trace filter deserialization.

use ethcore::{client, client::BlockId};
use ethereum_types::H160;
use v1::types::BlockNumber;

/// Trace filter
#[derive(Debug, PartialEq, Deserialize)]
#[serde(deny_unknown_fields)]
#[serde(rename_all = "camelCase")]
pub struct TraceFilter {
    /// From block
    pub from_block: Option<BlockNumber>,
    /// To block
    pub to_block: Option<BlockNumber>,
    /// From address
    pub from_address: Option<Vec<H160>>,
    /// To address
    pub to_address: Option<Vec<H160>>,
    /// Output offset
    pub after: Option<usize>,
    /// Output amount
    pub count: Option<usize>,
}

impl Into<client::TraceFilter> for TraceFilter {
    fn into(self) -> client::TraceFilter {
        let num_to_id = |num| match num {
            BlockNumber::Hash { hash, .. } => BlockId::Hash(hash),
            BlockNumber::Num(n) => BlockId::Number(n),
            BlockNumber::Earliest => BlockId::Earliest,
            BlockNumber::Latest => BlockId::Latest,
            BlockNumber::Pending => {
                warn!("Pending traces are not supported and might be removed in future versions. Falling back to Latest");
                BlockId::Latest
            }
        };
        let start = self.from_block.map_or(BlockId::Latest, &num_to_id);
        let end = self.to_block.map_or(BlockId::Latest, &num_to_id);
        client::TraceFilter {
            range: start..end,
            from_address: self
                .from_address
                .map_or_else(Vec::new, |x| x.into_iter().map(Into::into).collect()),
            to_address: self
                .to_address
                .map_or_else(Vec::new, |x| x.into_iter().map(Into::into).collect()),
            after: self.after,
            count: self.count,
        }
    }
}

#[cfg(test)]
mod tests {
    use ethereum_types::Address;
    use serde_json;
    use v1::types::{BlockNumber, TraceFilter};

    #[test]
    fn test_empty_trace_filter_deserialize() {
        let s = r#"{}"#;
        let deserialized: TraceFilter = serde_json::from_str(s).unwrap();
        assert_eq!(
            deserialized,
            TraceFilter {
                from_block: None,
                to_block: None,
                from_address: None,
                to_address: None,
                after: None,
                count: None,
            }
        );
    }

    #[test]
    fn test_trace_filter_deserialize() {
        let s = r#"{
			"fromBlock": "latest",
			"toBlock": "latest",
			"fromAddress": ["0x0000000000000000000000000000000000000003"],
			"toAddress": ["0x0000000000000000000000000000000000000005"],
			"after": 50,
			"count": 100
		}"#;
        let deserialized: TraceFilter = serde_json::from_str(s).unwrap();
        assert_eq!(
            deserialized,
            TraceFilter {
                from_block: Some(BlockNumber::Latest),
                to_block: Some(BlockNumber::Latest),
                from_address: Some(vec![Address::from_low_u64_be(3).into()]),
                to_address: Some(vec![Address::from_low_u64_be(5).into()]),
                after: 50.into(),
                count: 100.into(),
            }
        );
    }
}
