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

if os.name == 'nt':
    # On Windows wsl and qemu-user is required:
    # sudo apt install qemu-user
    qemu_command = ['wsl', 'qemu-arm']
else:
    qemu_command = ['qemu-arm']


def parse_results(log_text: str) -> dict[int, bytes]:
    regex = r"^READ_DATA offs=(\d*) size=(\d*) data=(.*)$"
    matches = re.finditer(regex, log_text, re.MULTILINE)
    var_dict: dict[int, bytes] = {}

    for match in matches:
        value_str: list[str] = match.group(3).strip().split(' ')
        #print('--', value_str)
        value = bytes(int(v, base=16) for v in value_str)
        if len(value) <= 8:
            var_dict[int(match.group(1))] = value

    return var_dict


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 check_for_qemu() -> bool:
    command = qemu_command + ['--version']
    try:
        result = subprocess.run(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, check=False)
    except Exception:
        return False
    return result.returncode == 0


def function1(c1: NumLike) -> list[NumLike]:
    return [c1 / 4, c1 / -4, c1 // 4, c1 // -4, (c1 * -1) // 4,
            c1 * 4, c1 * -4,
            c1 + 4, c1 - 4,
            c1 > 2, c1 > 100, c1 < 4, c1 < 100]


def function2(c1: NumLike) -> list[NumLike]:
    return [c1 * 4.44, c1 * -4.44]


def function3(c1: NumLike) -> list[NumLike]:
    return [c1 / 4]


def function4(c1: NumLike) -> list[NumLike]:
    return [c1 == 9, c1 == 4, c1 != 9, c1 != 4]


def function5(c1: NumLike) -> list[NumLike]:
    return [c1 == True, c1 == False, c1 != True, c1 != False, c1 / 2, c1 + 2]


def function6(c1: NumLike) -> list[NumLike]:
    return [c1 == True]


def iiftests(c1: NumLike) -> list[NumLike]:
    return [iif(c1 > 5, 8, 9),
            iif(c1 < 5, 8.5, 9.5),
            iif(1 > 5, 3.3, 8.8) + c1,
            iif(1 < 5, c1 * 3.3, 8.8),
            iif(c1 < 5, c1 * 3.3, 8.8)]


@pytest.mark.runner
def test_compile():
    c_i = variable(9)
    c_f = variable(1.111)
    c_b = variable(True)

    ret_test = function1(c_i) + function1(c_f) + function2(c_i) + function2(c_f) + function3(c_i) + function4(c_i) + function5(c_b) + [variable(9) % 2] + iiftests(c_i) + iiftests(c_f) + [cp.asin(c_i/10)]
    ret_ref = function1(9) + function1(1.111) + function2(9) + function2(1.111) + function3(9) + function4(9) + function5(True) + [9 % 2] + iiftests(9) + iiftests(1.111) + [cp.asin(9/10)]

    #ret_test = (c_i * 100 // 5, c_f * 10 // 5)
    #ret_ref = (9 * 100 // 5, 1.111 * 10 // 5)

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

    sdb = backend.stencil_db_from_package('armv7')
    dw, variables = compile_to_dag(out, sdb)

    #dw.write_com(_binwrite.Command.READ_DATA)
    #dw.write_int(0)
    #dw.write_int(28)

    # run program command
    dw.write_com(_binwrite.Command.RUN_PROG)
    #dw.write_com(_binwrite.Command.DUMP_CODE)

    for net in ret_test:
        assert isinstance(net, backend.Net)
        add_read_command(dw, variables, net)

    #dw.write_com(_binwrite.Command.READ_DATA)
    #dw.write_int(0)
    #dw.write_int(28)

    dw.write_com(_binwrite.Command.END_COM)

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

    dw.to_file('build/runner/test-armv7.copapy')

    if not check_for_qemu():
        warnings.warn("qemu-armv7 not found, armv7 test skipped!", UserWarning)
        return
    if not os.path.isfile('build/runner/coparun-armv7'):
        warnings.warn("armv7 runner not found, armv7 test skipped!", UserWarning)
        return

    command = qemu_command + ['build/runner/coparun-armv7', 'build/runner/test-armv7.copapy'] + ['build/runner/test-armv7.copapy.bin']
    #try:
    result = run_command(command)
    #except FileNotFoundError:
    #    warnings.warn(f"Test skipped, executable not found.", UserWarning)
    #    return

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

    assert 'Return value: 1' in result

    result_data = parse_results(result)

    for test, ref in zip(ret_test, ret_ref):
        assert isinstance(test, variable)
        address = variables[test][0]
        data = result_data[address]
        if test.dtype == 'int':
            val = int.from_bytes(data, sdb.byteorder, signed=True)
        elif test.dtype == 'bool':
            val = bool.from_bytes(data, sdb.byteorder)
        elif test.dtype == 'float':
            en = {'little': '<', 'big': '>'}[sdb.byteorder]
            val = struct.unpack(en + 'f', data)[0]
            assert isinstance(val, float)
        else:
            raise Exception(f"Unknown type: {test.dtype}")
        print('+', val, ref, test.dtype, f"  addr={address}")
        for t in (int, float, bool):
            assert isinstance(val, t) == isinstance(ref, t), f"Result type does not match for {val} and {ref}"
            assert val == pytest.approx(ref, 1e-5), f"Result does not match: {val} and reference: {ref}"  # pyright: ignore[reportUnknownMemberType]


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