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// Copyright 2019-2022 PureStake Inc.
// This file is part of Moonbeam.

// Moonbeam 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.

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

use crate::listeners::call_list::Listener;
use crate::types::serialization::*;
use crate::types::{
    single::{Call, TransactionTrace},
    CallResult, CallType, CreateResult,
};
use ethereum_types::{H160, U256};
use parity_scale_codec::{Decode, Encode};
use serde::Serialize;

pub struct Formatter;

impl super::ResponseFormatter for Formatter {
    type Listener = Listener;
    type Response = TransactionTrace;

    fn format(listener: Listener) -> Option<TransactionTrace> {
        if let Some(entry) = listener.entries.last() {
            return Some(TransactionTrace::CallList(
                entry
                    .into_iter()
                    .map(|(_, value)| Call::Blockscout(value.clone()))
                    .collect(),
            ));
        }
        None
    }
}

#[derive(Clone, Eq, PartialEq, Debug, Encode, Decode, Serialize)]
#[serde(rename_all = "lowercase", tag = "type")]
pub enum BlockscoutCallInner {
    Call {
        #[serde(rename(serialize = "callType"))]
        /// Type of call.
        call_type: CallType,
        to: H160,
        #[serde(serialize_with = "bytes_0x_serialize")]
        input: Vec<u8>,
        /// "output" or "error" field
        #[serde(flatten)]
        res: CallResult,
    },
    Create {
        #[serde(serialize_with = "bytes_0x_serialize")]
        init: Vec<u8>,
        #[serde(flatten)]
        res: CreateResult,
    },
    SelfDestruct {
        #[serde(skip)]
        balance: U256,
        to: H160,
    },
}

#[derive(Clone, Eq, PartialEq, Debug, Encode, Decode, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct BlockscoutCall {
    pub from: H160,
    /// Indices of parent calls.
    pub trace_address: Vec<u32>,
    /// Number of children calls.
    /// Not needed for Blockscout, but needed for `crate::block`
    /// types that are build from this type.
    #[serde(skip)]
    pub subtraces: u32,
    /// Sends funds to the (payable) function
    pub value: U256,
    /// Remaining gas in the runtime.
    pub gas: U256,
    /// Gas used by this context.
    pub gas_used: U256,
    #[serde(flatten)]
    pub inner: BlockscoutCallInner,
}