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// SPDX-License-Identifier: Apache-2.0
// This file is part of Frontier.
//
// Copyright (c) 2020-2022 Parity Technologies (UK) Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// 	http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#![cfg_attr(not(feature = "std"), no_std)]
#![deny(unused_crate_dependencies)]

pub use ethereum::{
    AccessListItem, BlockV2 as Block, LegacyTransactionMessage, Log, ReceiptV3 as Receipt,
    TransactionAction, TransactionV2 as Transaction,
};
use ethereum_types::{H160, H256, U256};
use pallet_3vm_evm_primitives::CheckEvmTransactionInput;
use scale_codec::{Decode, Encode};
use sp_std::vec::Vec;

#[repr(u8)]
#[derive(num_enum::FromPrimitive, num_enum::IntoPrimitive)]
pub enum TransactionValidationError {
    #[allow(dead_code)]
    #[num_enum(default)]
    UnknownError,
    InvalidChainId,
    InvalidSignature,
    GasLimitTooLow,
    GasLimitTooHigh,
    MaxFeePerGasTooLow,
}

pub trait ValidatedTransaction {
    fn apply(
        source: H160,
        transaction: Transaction,
    ) -> frame_support::dispatch::DispatchResultWithPostInfo;
}

#[derive(Clone, Debug, Eq, PartialEq, Encode, Decode)]
pub struct TransactionData {
    pub action: TransactionAction,
    pub input: Vec<u8>,
    pub nonce: U256,
    pub gas_limit: U256,
    pub gas_price: Option<U256>,
    pub max_fee_per_gas: Option<U256>,
    pub max_priority_fee_per_gas: Option<U256>,
    pub value: U256,
    pub chain_id: Option<u64>,
    pub access_list: Vec<(H160, Vec<H256>)>,
}

impl From<TransactionData> for CheckEvmTransactionInput {
    fn from(t: TransactionData) -> Self {
        CheckEvmTransactionInput {
            to: if let TransactionAction::Call(to) = t.action {
                Some(to)
            } else {
                None
            },
            chain_id: t.chain_id,
            input: t.input,
            nonce: t.nonce,
            gas_limit: t.gas_limit,
            gas_price: t.gas_price,
            max_fee_per_gas: t.max_fee_per_gas,
            max_priority_fee_per_gas: t.max_priority_fee_per_gas,
            value: t.value,
            access_list: t.access_list,
        }
    }
}

impl From<&Transaction> for TransactionData {
    fn from(t: &Transaction) -> Self {
        match t {
            Transaction::Legacy(t) => TransactionData {
                action: t.action,
                input: t.input.clone(),
                nonce: t.nonce,
                gas_limit: t.gas_limit,
                gas_price: Some(t.gas_price),
                max_fee_per_gas: None,
                max_priority_fee_per_gas: None,
                value: t.value,
                chain_id: t.signature.chain_id(),
                access_list: Vec::new(),
            },
            Transaction::EIP2930(t) => TransactionData {
                action: t.action,
                input: t.input.clone(),
                nonce: t.nonce,
                gas_limit: t.gas_limit,
                gas_price: Some(t.gas_price),
                max_fee_per_gas: None,
                max_priority_fee_per_gas: None,
                value: t.value,
                chain_id: Some(t.chain_id),
                access_list: t
                    .access_list
                    .iter()
                    .map(|d| (d.address, d.storage_keys.clone()))
                    .collect(),
            },
            Transaction::EIP1559(t) => TransactionData {
                action: t.action,
                input: t.input.clone(),
                nonce: t.nonce,
                gas_limit: t.gas_limit,
                gas_price: None,
                max_fee_per_gas: Some(t.max_fee_per_gas),
                max_priority_fee_per_gas: Some(t.max_priority_fee_per_gas),
                value: t.value,
                chain_id: Some(t.chain_id),
                access_list: t
                    .access_list
                    .iter()
                    .map(|d| (d.address, d.storage_keys.clone()))
                    .collect(),
            },
        }
    }
}