// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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(feature = "mesalock_sgx", no_std)]
#[cfg(feature = "mesalock_sgx")]
#[macro_use]
extern crate sgx_tstd as std;

#[cfg(feature = "mesalock_sgx")]
use std::prelude::v1::*;
use std::untrusted::path::PathEx;

use anyhow::{anyhow, ensure, Result};

use teaclave_attestation::{verifier, AttestationConfig, RemoteAttestation};
use teaclave_binder::proto::{
    ECallCommand, FinalizeEnclaveInput, FinalizeEnclaveOutput, InitEnclaveInput, InitEnclaveOutput,
    StartServiceInput, StartServiceOutput,
};
use teaclave_binder::{handle_ecall, register_ecall_handler};
use teaclave_config::build::{AS_ROOT_CA_CERT, AUDITOR_PUBLIC_KEYS};
use teaclave_config::RuntimeConfig;
use teaclave_service_enclave_utils::create_trusted_scheduler_endpoint;
use teaclave_service_enclave_utils::ServiceEnclave;
use teaclave_types::{EnclaveInfo, TeeServiceError, TeeServiceResult};

mod ocall;
mod service;
mod task_file_manager;

fn start_service(config: &RuntimeConfig) -> Result<()> {
    let attestation_config = AttestationConfig::from_teaclave_config(&config)?;
    let attested_tls_config = RemoteAttestation::new(attestation_config)
        .generate_and_endorse()?
        .attested_tls_config()
        .ok_or_else(|| anyhow!("cannot get attested TLS config"))?;
    let enclave_info = EnclaveInfo::verify_and_new(
        &config.audit.enclave_info_bytes,
        AUDITOR_PUBLIC_KEYS,
        &config.audit.auditor_signatures_bytes,
    )?;
    let scheduler_service_address = &config.internal_endpoints.scheduler.advertised_address;
    let scheduler_service_endpoint = create_trusted_scheduler_endpoint(
        &scheduler_service_address,
        &enclave_info,
        AS_ROOT_CA_CERT,
        verifier::universal_quote_verifier,
        attested_tls_config,
    )?;

    let fusion_base = config.mount.fusion_base_dir.clone();

    // We only create this base directory in test_mode
    // This directory should be mounted in release mode
    #[cfg(test_mode)]
    std::untrusted::fs::create_dir_all(&fusion_base)?;

    ensure!(
        fusion_base.exists(),
        "Fusion base directory is not mounted: {}",
        fusion_base.display()
    );

    let mut service =
        service::TeaclaveExecutionService::new(scheduler_service_endpoint, fusion_base)?;
    let _ = service.start();

    Ok(())
}

#[handle_ecall]
fn handle_start_service(input: &StartServiceInput) -> TeeServiceResult<StartServiceOutput> {
    match start_service(&input.config) {
        Ok(_) => Ok(StartServiceOutput),
        Err(e) => {
            log::error!("Failed to start the service: {}", e);
            Err(TeeServiceError::ServiceError)
        }
    }
}

#[handle_ecall]
fn handle_init_enclave(_: &InitEnclaveInput) -> TeeServiceResult<InitEnclaveOutput> {
    ServiceEnclave::init(env!("CARGO_PKG_NAME"))?;
    Ok(InitEnclaveOutput)
}

#[handle_ecall]
fn handle_finalize_enclave(_: &FinalizeEnclaveInput) -> TeeServiceResult<FinalizeEnclaveOutput> {
    ServiceEnclave::finalize()?;
    Ok(FinalizeEnclaveOutput)
}

register_ecall_handler!(
    type ECallCommand,
    (ECallCommand::StartService, StartServiceInput, StartServiceOutput),
    (ECallCommand::InitEnclave, InitEnclaveInput, InitEnclaveOutput),
    (ECallCommand::FinalizeEnclave, FinalizeEnclaveInput, FinalizeEnclaveOutput),
);

#[cfg(feature = "enclave_unit_test")]
pub mod tests {
    use super::*;
    use teaclave_test_utils::*;

    pub fn run_tests() -> bool {
        run_tests!(
            ocall::tests::test_handle_file_request,
            service::tests::test_invoke_echo,
            service::tests::test_invoke_gbdt_train,
            task_file_manager::tests::test_input,
        )
    }
}