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// Copyright 2019-2022 PureStake Inc.
// This file is part Utils package, originally developed by PureStake

// Utils 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.

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

use crate::{data::EvmDataReader, modifier::FunctionModifier, EvmResult};
use pallet_3vm_evm_primitives::{Log, PrecompileHandle};

pub trait PrecompileHandleExt: PrecompileHandle {
    /// Record cost of a log manually.
    /// This can be useful to record log costs early when their content have static size.
    #[must_use]
    fn record_log_costs_manual(&mut self, topics: usize, data_len: usize) -> EvmResult;

    /// Record cost of logs.
    #[must_use]
    fn record_log_costs(&mut self, logs: &[&Log]) -> EvmResult;

    #[must_use]
    /// Check that a function call is compatible with the context it is
    /// called into.
    fn check_function_modifier(&self, modifier: FunctionModifier) -> EvmResult;

    #[must_use]
    /// Read the selector from the input data.
    fn read_selector<T>(&self) -> EvmResult<T>
    where
        T: num_enum::TryFromPrimitive<Primitive = u32>;

    #[must_use]
    /// Returns a reader of the input, skipping the selector.
    fn read_input(&self) -> EvmResult<EvmDataReader>;
}

impl<T: PrecompileHandle> PrecompileHandleExt for T {
    /// Record cost of a log manualy.
    /// This can be useful to record log costs early when their content have static size.
    #[must_use]
    fn record_log_costs_manual(&mut self, topics: usize, data_len: usize) -> EvmResult {
        self.record_cost(crate::costs::log_costs(topics, data_len)?)?;

        Ok(())
    }

    /// Record cost of logs.
    #[must_use]
    fn record_log_costs(&mut self, logs: &[&Log]) -> EvmResult {
        for log in logs {
            self.record_log_costs_manual(log.topics.len(), log.data.len())?;
        }

        Ok(())
    }

    #[must_use]
    /// Check that a function call is compatible with the context it is
    /// called into.
    fn check_function_modifier(&self, modifier: FunctionModifier) -> EvmResult {
        crate::modifier::check_function_modifier(self.context(), self.is_static(), modifier)
    }

    #[must_use]
    /// Read the selector from the input data.
    fn read_selector<S>(&self) -> EvmResult<S>
    where
        S: num_enum::TryFromPrimitive<Primitive = u32>,
    {
        EvmDataReader::read_selector(self.input())
    }

    #[must_use]
    /// Returns a reader of the input, skipping the selector.
    fn read_input(&self) -> EvmResult<EvmDataReader> {
        EvmDataReader::new_skip_selector(self.input())
    }
}