from copapy import variable, NumLike
from copapy.backend import Write, compile_to_dag, add_read_command
import subprocess
import struct
from copapy import _binwrite
import copapy.backend as backend
import os
import pytest

if os.name == 'nt':
    # On Windows wsl and qemu-user is required:
    # sudo apt install qemu-user
    qemu_command = ['wsl', 'qemu-aarch64', 'bin/coparun-aarch64', 'bin/test-aarch64.copapy']
else:
    qemu_command = ['qemu-aarch64', 'bin/coparun-aarch64', 'bin/test-aarch64.copapy']


def run_command(command: list[str]) -> str:
    result = subprocess.run(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, encoding='utf8', check=False)
    assert result.returncode != 11, f"SIGSEGV (segmentation fault)\n -Error occurred: {result.stderr}\n -Output: {result.stdout}"
    assert result.returncode == 0, f"\n -Error occurred: {result.stderr}\n -Output: {result.stdout}"
    return result.stdout


def test_example():
    c1 = 4
    c2 = 2

    i1 = c1 * 2
    r1 = i1 + 7 + (c2 + 7 * 9)
    r2 = i1 + 9

    en = {'little': '<', 'big': '>'}['little']
    data = struct.pack(en + 'i', r1)
    print("example r1 " + ' '.join(f'{b:02X}' for b in data))

    data = struct.pack(en + 'i', r2)
    print("example r2 " + ' '.join(f'{b:02X}' for b in data))


def function(c1: NumLike, c2: NumLike) -> tuple[NumLike, ...]:
    i1 = c1 // 3.3 + 5
    i2 = c2 * 5 + c1
    r1 = i1 + i2 * 55 / 4
    r2 = 4 * i2 + 5

    return i1, i2, r1, r2


@pytest.mark.skip(reason="no way of currently testing this")
def test_compile():
    c1 = variable(4)
    c2 = variable(2)

    ret = function(c1, c2)
    #ret = [c1 // 3.3 + 5]

    out = [Write(r) for r in ret]

    sdb = backend.stencil_db_from_package('aarch64', 'O3')
    il, variables = compile_to_dag(out, sdb)

    # run program command
    il.write_com(_binwrite.Command.RUN_PROG)

    for net in ret:
        assert isinstance(net, backend.Net)
        add_read_command(il, variables, net)

    il.write_com(_binwrite.Command.END_COM)

    print('* Data to runner:')
    il.print()

    il.to_file('bin/test-aarch64.copapy')

    result = run_command(qemu_command)
    print('* Output from runner:\n--')
    print(result)
    print('--')

    assert 'Return value: 1' in result
    #assert 'END_COM' in result


if __name__ == "__main__":
    #test_example()
    test_compile()