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use multiversx_sc::{
    api::{LogApi, LogApiImpl},
    types::{
        heap::ArgBuffer, managed_vec_of_buffers_to_arg_buffer, ManagedBuffer, ManagedType,
        ManagedVec,
    },
};

use crate::{tx_mock::TxLog, DebugApi};

impl LogApi for DebugApi {
    type LogApiImpl = DebugApi;

    fn log_api_impl() -> Self::LogApiImpl {
        DebugApi::new_from_static()
    }
}

/// Interface to only be used by code generated by the macros.
/// The smart contract code doesn't have access to these methods directly.
impl LogApiImpl for DebugApi {
    fn write_event_log(&self, topics_buffer: &ArgBuffer, data: &[u8]) {
        let arg_data_buffer = topics_buffer.arg_data();
        let arg_data_lengths = topics_buffer.arg_lengths();

        let mut current_index = 0;
        let mut topics = Vec::new();

        // we already processed the first data arg, so we skip it
        for arg_len in arg_data_lengths.iter() {
            let topic = arg_data_buffer[current_index..(current_index + arg_len)].to_vec();
            topics.push(topic);

            current_index += arg_len;
        }

        let mut tx_result = self.result_borrow_mut();
        tx_result.result_logs.push(TxLog {
            address: self.input_ref().to.clone(),
            endpoint: self.input_ref().func_name.clone(),
            topics,
            data: data.to_vec(),
        });
    }

    fn write_legacy_log(&self, topics: &[[u8; 32]], data: &[u8]) {
        let topics_vec = topics.iter().map(|array| array.to_vec()).collect();

        let mut tx_result = self.result_borrow_mut();
        tx_result.result_logs.push(TxLog {
            address: self.input_ref().to.clone(),
            endpoint: self.input_ref().func_name.clone(),
            topics: topics_vec,
            data: data.to_vec(),
        });
    }

    fn managed_write_log(
        &self,
        topics_handle: Self::ManagedBufferHandle,
        data_handle: Self::ManagedBufferHandle,
    ) {
        let topics = ManagedVec::<Self, ManagedBuffer<Self>>::from_handle(topics_handle);
        let topics_arg_buffer = managed_vec_of_buffers_to_arg_buffer(topics);
        let data = ManagedBuffer::<Self>::from_handle(data_handle);
        self.write_event_log(&topics_arg_buffer, data.to_boxed_bytes().as_slice());
    }
}