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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/>.

//! Runtime API allowing to debug/trace Ethereum

extern crate alloc;

use ethereum_types::{H160, H256};
use parity_scale_codec::{Decode, Encode};
use sp_std::vec::Vec;

pub mod block;
pub mod serialization;
pub mod single;

use serde::Serialize;
use serialization::*;

pub const MANUAL_BLOCK_INITIALIZATION_RUNTIME_VERSION: u32 = 159;

#[derive(Clone, Eq, PartialEq, Debug, Encode, Decode, Serialize)]
#[serde(rename_all = "camelCase")]
pub enum CallResult {
    Output(#[serde(serialize_with = "bytes_0x_serialize")] Vec<u8>),
    // field "error"
    Error(#[serde(serialize_with = "string_serialize")] Vec<u8>),
}

#[derive(Clone, Eq, PartialEq, Debug, Encode, Decode, Serialize)]
#[serde(rename_all = "camelCase", untagged)]
pub enum CreateResult {
    Error {
        #[serde(serialize_with = "string_serialize")]
        error: Vec<u8>,
    },
    Success {
        #[serde(rename = "createdContractAddressHash")]
        created_contract_address_hash: H160,
        #[serde(serialize_with = "bytes_0x_serialize", rename = "createdContractCode")]
        created_contract_code: Vec<u8>,
    },
}

#[derive(Clone, Copy, Eq, PartialEq, Debug, Encode, Decode, Serialize)]
#[serde(rename_all = "lowercase")]
pub enum CallType {
    Call,
    CallCode,
    DelegateCall,
    StaticCall,
}

#[derive(Clone, Copy, Eq, PartialEq, Debug, Encode, Decode, Serialize)]
#[serde(rename_all = "lowercase")]
pub enum CreateType {
    Create,
}

#[derive(Debug)]
pub enum ContextType {
    Call(CallType),
    Create,
}

impl ContextType {
    pub fn from(opcode: Vec<u8>) -> Option<Self> {
        let opcode = match alloc::str::from_utf8(&opcode[..]) {
            Ok(op) => op.to_uppercase(),
            _ => return None,
        };
        match &opcode[..] {
            "CREATE" | "CREATE2" => Some(ContextType::Create),
            "CALL" => Some(ContextType::Call(CallType::Call)),
            "CALLCODE" => Some(ContextType::Call(CallType::CallCode)),
            "DELEGATECALL" => Some(ContextType::Call(CallType::DelegateCall)),
            "STATICCALL" => Some(ContextType::Call(CallType::StaticCall)),
            _ => None,
        }
    }
}

pub fn convert_memory(memory: Vec<u8>) -> Vec<H256> {
    let size = 32;
    memory
        .chunks(size)
        .map(|c| {
            let mut msg = [0u8; 32];
            let chunk = c.len();
            if chunk < size {
                let left = size - chunk;
                let remainder = vec![0; left];
                msg[0..left].copy_from_slice(&remainder[..]);
                msg[left..size].copy_from_slice(c);
            } else {
                msg[0..size].copy_from_slice(c)
            }
            H256::from_slice(&msg[..])
        })
        .collect()
}