// 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..

use sgx_types::*;
use std::string::String;
use std::vec::Vec;

use sgx_trts::ascii::AsciiExt;
use sgx_trts::c_str::*;
use sgx_trts::enclave::*;
use sgx_trts::error;
use sgx_trts::libc;
use sgx_trts::memchr;
use sgx_trts::trts::*;
use sgx_trts::veh::*;

//Only during dev
//use core::mem;

global_ctors_object! {
    VARNAME, func_name = {()}
}

// veh
extern "C" fn sample_exception_handler(_: *mut sgx_exception_info_t) -> int32_t {
    0
}

pub fn test_rsgx_get_thread_policy() {
    assert_eq!(rsgx_get_thread_policy(), SgxThreadPolicy::Bound);
}

pub fn test_trts_sizes() {
    //Only during dev
    //assert_eq!(mem::size_of::<global_data_t>(), 1488);
    //assert_eq!(mem::size_of::<thread_data_t>(), 160);
}

pub fn test_register_first_exception_handler() {
    let handle = rsgx_register_exception_handler(1, sample_exception_handler);
    assert!(handle.is_some());
    assert_eq!(rsgx_unregister_exception_handler(handle.unwrap()), true);
}

pub fn test_register_last_exception_handler() {
    let handle = rsgx_register_exception_handler(0, sample_exception_handler);
    assert!(handle.is_some());
    assert_eq!(rsgx_unregister_exception_handler(handle.unwrap()), true);
}

pub fn test_register_multiple_exception_handler() {
    let mut handler_vec: Vec<exception_handle> = Vec::new();
    let ntest: usize = 100;

    for i in 0..ntest {
        let handle = rsgx_register_exception_handler(i as uint32_t % 2, sample_exception_handler);
        assert!(handle.is_some());
        handler_vec.push(handle.unwrap());
    }

    for i in 0..ntest {
        let h = handler_vec[i];
        assert_eq!(rsgx_unregister_exception_handler(h), true);
    }

    for i in 0..ntest {
        let h = handler_vec[i];
        assert_eq!(rsgx_unregister_exception_handler(h), false);
    }
}

// trts
pub fn test_read_rand() {
    let mut rand_arr = [0; 100];
    assert_eq!(rsgx_read_rand(&mut rand_arr[..]), Ok(()));
    // Cannot all be zero
    let cmp = [0; 100].iter().zip(rand_arr.iter()).all(|(x, y)| x == y);
    assert_ne!(cmp, true);
}

pub fn test_data_is_within_enclave() {
    #[allow(dead_code)]
    #[derive(Clone, Copy)]
    struct SampleDs {
        x: i32,
        y: i32,
        z: [i32; 100],
    }
    unsafe impl marker::ContiguousMemory for SampleDs {}
    let mut sample_object: SampleDs = SampleDs {
        x: 0,
        y: 0,
        z: [0; 100],
    };
    sample_object.x = 100;
    sample_object.y = 100;
    sample_object.z[0] = 100;
    assert_eq!(rsgx_data_is_within_enclave(&sample_object), true);

    let ooo;
    unsafe {
        let ppp = 0xdeadbeafdeadbeaf as *const u8;
        ooo = &*ppp;
    }
    assert_eq!(rsgx_data_is_within_enclave(ooo), false);
}

pub fn test_slice_is_within_enlave() {
    let one_array = [0; 100];
    assert_eq!(rsgx_slice_is_within_enclave(&one_array[..]), true);

    // TODO: Not compiling
    //let mut ooo : &[u8];
    //unsafe {
    //    let ppp = 0xdeadbeafdeadbeaf as * const [u8];
    //    ooo = &*ppp;
    //}
    //assert_eq!(rsgx_slice_is_within_enclave(ooo), false);
}

pub fn test_raw_is_within_enclave() {
    assert_eq!(
        rsgx_raw_is_within_enclave(test_raw_is_within_enclave as *const u8, 10),
        true
    );
    assert_eq!(
        rsgx_raw_is_within_enclave(0xdeadbeafdeadbeaf as *const u8, 10),
        false
    );
}

pub fn test_data_is_outside_enclave() {
    #[allow(dead_code)]
    #[derive(Clone, Copy)]
    struct SampleDs {
        x: i32,
        y: i32,
        z: [i32; 100],
    }
    unsafe impl marker::ContiguousMemory for SampleDs {}
    let mut sample_object: SampleDs = SampleDs {
        x: 0,
        y: 0,
        z: [0; 100],
    };
    sample_object.x = 100;
    sample_object.y = 100;
    sample_object.z[0] = 100;
    assert_eq!(rsgx_data_is_outside_enclave(&sample_object), false);

    let ooo;
    unsafe {
        let ppp = 0xdeadbeafdeadbeaf as *const u8;
        ooo = &*ppp;
    }
    assert_eq!(rsgx_data_is_outside_enclave(ooo), true);
}

pub fn test_slice_is_outside_enclave() {
    let one_array = [0; 100];
    assert_eq!(rsgx_slice_is_outside_enclave(&one_array[..]), false);

    // TODO: Not compiling
    //let mut ooo : &[u8];
    //unsafe {
    //    let ppp = 0xdeadbeafdeadbeaf as * const [u8];
    //    ooo = &*ppp;
    //}
    //assert_eq!(rsgx_slice_is_within_enclave(ooo), true);
}

pub fn test_raw_is_outside_enclave() {
    assert_eq!(
        rsgx_raw_is_outside_enclave(test_raw_is_outside_enclave as *const u8, 10),
        false
    );
    assert_eq!(
        rsgx_raw_is_outside_enclave(0xdeadbeafdeadbeaf as *const u8, 10),
        true
    );
}

// macros

pub fn test_global_ctors_object() {
    assert_eq!(VARNAME(), ());
}

// oom
// I don't think we can test oom

// error
pub fn test_error() {
    // XXX: Top 11 should be the same in all unix?
    let errorinfo_vec: Vec<(i32, &'static str)> = vec![
        (1, "Operation not permitted"),
        (2, "No such file or directory"),
        (3, "No such process"),
        (4, "Interrupted system call"),
        (5, "Input/output error"),
        (6, "Device not configured"),
        (7, "Argument list too long"),
        (8, "Exec format error"),
        (9, "Bad file descriptor"),
        (10, "No child processes"),
        (11, "Resource deadlock avoided"),
    ];

    for case in errorinfo_vec {
        let mut buf: [i8; 64] = [0; 64];
        error::set_errno(case.0);
        unsafe {
            error::error_string(error::errno(), &mut buf[..]);
        }
        let answer: Vec<u8> = buf.iter().map(|&x| x as u8).collect();
        let ans_str = String::from_utf8(answer).unwrap();
        assert_eq!(ans_str.trim_matches('\0'), case.1);
    }
}

// libc
pub fn test_rts_libc_memchr() {
    let test_str = "abcdedfg";
    assert_eq!(
        unsafe { libc::memchr(test_str.as_ptr() as *const u8, 'd' as u8, test_str.len()) },
        test_str[3..].as_ptr()
    );
    assert_eq!(
        unsafe { libc::memchr("abcdefg".as_ptr() as *const u8, 'z' as u8, test_str.len()) },
        0 as *const u8
    );
}

pub fn test_rts_libc_memrchr() {
    let test_str = "abcdedfg";
    assert_eq!(
        unsafe { libc::memrchr(test_str.as_ptr() as *const u8, 'd' as u8, test_str.len()) },
        test_str[5..].as_ptr()
    );
    assert_eq!(
        unsafe { libc::memrchr("abcdefg".as_ptr() as *const u8, 'z' as u8, test_str.len()) },
        0 as *const u8
    );
}

// memchr

pub fn test_rts_memchr_memchr() {
    let test_str = "abcdedfg".as_bytes();
    let needle = 'd' as u8;
    assert_eq!(memchr::memchr(needle, test_str), Some(3));
    let needle = 'z' as u8;
    assert_eq!(memchr::memchr(needle, test_str), None);
}

pub fn test_rts_memchr_memrchr() {
    let test_str = "abcdedfg".as_bytes();
    let needle = 'd' as u8;
    assert_eq!(memchr::memrchr(needle, test_str), Some(5));
    let needle = 'z' as u8;
    assert_eq!(memchr::memrchr(needle, test_str), None);
}

// ascii
pub fn test_ascii() {
    assert_eq!("café".to_ascii_uppercase(), "CAFÉ");
    assert_eq!("café".to_ascii_uppercase(), "CAFé");

    let ascii = 'a';
    let non_ascii = '❤';
    let int_ascii = 97;

    assert!(ascii.is_ascii());
    assert!(!non_ascii.is_ascii());
    assert!(int_ascii.is_ascii());
    assert_eq!('A', ascii.to_ascii_uppercase());
    assert_eq!('❤', non_ascii.to_ascii_uppercase());
    assert_eq!(65, int_ascii.to_ascii_uppercase());

    let ascii = 'A';
    let non_ascii = '❤';
    let int_ascii = 65;

    assert_eq!('a', ascii.to_ascii_lowercase());
    assert_eq!('❤', non_ascii.to_ascii_lowercase());
    assert_eq!(97, int_ascii.to_ascii_lowercase());

    let ascii1 = 'A';
    let ascii2 = 'a';
    let ascii3 = 'A';
    let ascii4 = 'z';

    assert!(ascii1.eq_ignore_ascii_case(&ascii2));
    assert!(ascii1.eq_ignore_ascii_case(&ascii3));
    assert!(!ascii1.eq_ignore_ascii_case(&ascii4));

    let mut ascii = 'a';
    ascii.make_ascii_uppercase();
    assert_eq!('A', ascii);

    let mut ascii = 'A';
    ascii.make_ascii_lowercase();
    assert_eq!('a', ascii);
}

// c_str
pub fn test_cstr() {
    let c_string = CString::new("foo").unwrap();
    let ptr = c_string.into_raw();

    unsafe {
        assert_eq!(b'f', *ptr as u8);
        assert_eq!(b'o', *ptr.offset(1) as u8);
        assert_eq!(b'o', *ptr.offset(2) as u8);
        assert_eq!(b'\0', *ptr.offset(3) as u8);
        // retake pointer to free memory
        let _ = CString::from_raw(ptr);
    }

    let c_string = CString::new("foo").unwrap();
    let bytes = c_string.into_bytes();
    assert_eq!(bytes, vec![b'f', b'o', b'o']);

    let c_string = CString::new("foo").unwrap();
    let bytes = c_string.into_bytes_with_nul();
    assert_eq!(bytes, vec![b'f', b'o', b'o', b'\0']);

    let c_string = CString::new("foo").unwrap();
    let bytes = c_string.as_bytes();
    assert_eq!(bytes, &[b'f', b'o', b'o']);

    let c_string = CString::new("foo").unwrap();
    let bytes = c_string.as_bytes_with_nul();
    assert_eq!(bytes, &[b'f', b'o', b'o', b'\0']);

    let c_string = CString::new(b"foo".to_vec()).unwrap();
    let c_str = c_string.as_c_str();
    assert_eq!(c_str, CStr::from_bytes_with_nul(b"foo\0").unwrap());

    let c_string = CString::new(b"foo".to_vec()).unwrap();
    let boxed = c_string.into_boxed_c_str();
    assert_eq!(&*boxed, CStr::from_bytes_with_nul(b"foo\0").unwrap());

    let c_str = CStr::from_bytes_with_nul(b"foo\0").unwrap();
    assert_eq!(c_str.to_bytes(), b"foo");

    let c_str = CStr::from_bytes_with_nul(b"foo\0").unwrap();
    assert_eq!(c_str.to_bytes_with_nul(), b"foo\0");

    let c_str = CStr::from_bytes_with_nul(b"foo\0").unwrap();
    assert_eq!(c_str.to_str(), Ok("foo"));

    let c_str = CStr::from_bytes_with_nul(b"Hello World\0").unwrap();
    assert_eq!(c_str.to_string_lossy(), Cow::Borrowed("Hello World"));

    use std::borrow::Cow;

    let c_str = CStr::from_bytes_with_nul(b"Hello \xF0\x90\x80World\0").unwrap();
    assert_eq!(
        c_str.to_string_lossy(),
        Cow::Owned(String::from("Hello �World")) as Cow<str>
    );
}