// 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.

#![no_main]

use optee_utee::{
    ta_close_session, ta_create, ta_destroy, ta_invoke_command, ta_open_session, trace_println,
};
use optee_utee::{Error, ErrorKind, Parameters, Result};
use std::io::Write;
use proto::{self, Command};

fn handle_invoke(command: Command, input: proto::EnclaveInput) -> Result<proto::EnclaveOutput> {
    match command {
        Command::Hello => {
            let output = proto::EnclaveOutput {
                message: format!("Hello, {}", input.message)
            };
            Ok(output)
        },
        Command::Bye => {
            let output = proto::EnclaveOutput {
                message: format!("Bye, {}", input.message)
            };
            Ok(output)
        },
        _ => Err(Error::new(ErrorKind::BadParameters)),
    }
}

#[ta_create]
fn create() -> Result<()> {
    trace_println!("[+] TA create");
    Ok(())
}

#[ta_open_session]
fn open_session(_params: &mut Parameters) -> Result<()> {
    trace_println!("[+] TA open session");
    Ok(())
}

#[ta_close_session]
fn close_session() {
    trace_println!("[+] TA close session");
}

#[ta_destroy]
fn destroy() {
    trace_println!("[+] TA destroy");
}

#[ta_invoke_command]
fn invoke_command(cmd_id: u32, params: &mut Parameters) -> Result<()> {
    trace_println!("[+] TA invoke command");
    let mut p0 = unsafe { params.0.as_memref().unwrap()};
    let mut p1 = unsafe { params.1.as_memref().unwrap()};
    let mut p2 = unsafe { params.2.as_value().unwrap() };

    let input: proto::EnclaveInput = proto::serde_json::from_slice(p0.buffer()).unwrap();
    let output = handle_invoke(Command::from(cmd_id), input).unwrap();

    let output_vec = proto::serde_json::to_vec(&output).unwrap();
    p1.buffer().write(&output_vec).unwrap();
    p2.set_a(output_vec.len() as u32);

    Ok(())
}

// TA configurations
const TA_FLAGS: u32 = 0;
const TA_DATA_SIZE: u32 = 64 * 1024;
const TA_STACK_SIZE: u32 = 4 * 1024;
const TA_VERSION: &[u8] = b"0.1\0";
const TA_DESCRIPTION: &[u8] = b"This is a hello world example.\0";
const EXT_PROP_VALUE_1: &[u8] = b"Hello World TA\0";
const EXT_PROP_VALUE_2: u32 = 0x0010;
const TRACE_LEVEL: i32 = 4;
const TRACE_EXT_PREFIX: &[u8] = b"TA\0";
const TA_FRAMEWORK_STACK_SIZE: u32 = 2048;

include!(concat!(env!("OUT_DIR"), "/user_ta_header.rs"));