#!/usr/bin/env python3

import os, sys
from glob import glob
from re import sub
import argparse


def escape(s):
    s = s.decode()
    lookup = {
        "\0": "\\0",
        "\t": "\\t",
        "\n": '\\n"\n"',
        "\r": "\\r",
        "\\": "\\\\",
        '"': '\\"',
    }
    return '""\n"{}"'.format("".join([lookup[x] if x in lookup else x for x in s]))


def chew_filename(t):
    return {"func": "test_{}_fn".format(sub(r"/|\.|-", "_", t)), "desc": t}


def script_to_map(test_file):
    r = {"name": chew_filename(test_file)["func"]}
    with open(test_file, "rb") as f:
        r["script"] = escape(f.read())
    with open(test_file + ".exp", "rb") as f:
        r["output"] = escape(f.read())
    return r


test_function = (
    "void {name}(void* data) {{\n"
    "  static const char pystr[] = {script};\n"
    "  static const char exp[] = {output};\n"
    '  printf("\\n");\n'
    "  upytest_set_expected_output(exp, sizeof(exp) - 1);\n"
    "  upytest_execute_test(pystr);\n"
    '  printf("result: ");\n'
    "}}"
)

testcase_struct = "struct testcase_t {name}_tests[] = {{\n{body}\n  END_OF_TESTCASES\n}};"
testcase_member = '  {{ "{desc}", {func}, TT_ENABLED_, 0, 0 }},'

testgroup_struct = "struct testgroup_t groups[] = {{\n{body}\n  END_OF_GROUPS\n}};"
testgroup_member = '  {{ "{name}", {name}_tests }},'

## XXX: may be we could have `--without <groups>` argument...
# currently these tests are selected because they pass on qemu-arm
test_dirs = (
    "basics",
    "micropython",
    "misc",
    "extmod",
    "float",
    "inlineasm",
    "qemu-arm",
)  # 'import', 'io',)
exclude_tests = (
    # pattern matching in .exp
    "basics/bytes_compare3.py",
    "extmod/ticks_diff.py",
    "extmod/time_ms_us.py",
    "extmod/heapq_timeq.py",
    # unicode char issue
    "extmod/json_loads.py",
    # doesn't output to python stdout
    "extmod/re_debug.py",
    "extmod/vfs_basic.py",
    "extmod/vfs_fat_ramdisk.py",
    "extmod/vfs_fat_fileio.py",
    "extmod/vfs_fat_fsusermount.py",
    "extmod/vfs_fat_oldproto.py",
    # rounding issues
    "float/float_divmod.py",
    # requires double precision floating point to work
    "float/float2int_doubleprec_intbig.py",
    "float/float_format_ints_doubleprec.py",
    "float/float_parse_doubleprec.py",
    # inline asm FP tests (require Cortex-M4)
    "inlineasm/asmfpaddsub.py",
    "inlineasm/asmfpcmp.py",
    "inlineasm/asmfpldrstr.py",
    "inlineasm/asmfpmuldiv.py",
    "inlineasm/asmfpsqrt.py",
    # different filename in output
    "micropython/emg_exc.py",
    "micropython/heapalloc_traceback.py",
    # don't have emergency exception buffer
    "micropython/heapalloc_exc_compressed_emg_exc.py",
    # pattern matching in .exp
    "micropython/meminfo.py",
    # needs sys stdfiles
    "misc/print_exception.py",
    # settrace .exp files are too large
    "misc/sys_settrace_loop.py",
    "misc/sys_settrace_generator.py",
    "misc/sys_settrace_features.py",
    # don't have f-string
    "basics/string_fstring.py",
    "basics/string_fstring_debug.py",
)

output = []
tests = []

argparser = argparse.ArgumentParser(
    description="Convert native MicroPython tests to tinytest/upytesthelper C code"
)
argparser.add_argument("--stdin", action="store_true", help="read list of tests from stdin")
argparser.add_argument("--exclude", action="append", help="exclude test by name")
args = argparser.parse_args()

if not args.stdin:
    if args.exclude:
        exclude_tests += tuple(args.exclude)
    for group in test_dirs:
        tests += [test for test in glob("{}/*.py".format(group)) if test not in exclude_tests]
else:
    for l in sys.stdin:
        tests.append(l.rstrip())

output.extend([test_function.format(**script_to_map(test)) for test in tests])
testcase_members = [testcase_member.format(**chew_filename(test)) for test in tests]
output.append(testcase_struct.format(name="", body="\n".join(testcase_members)))

testgroup_members = [testgroup_member.format(name=group) for group in [""]]

output.append(testgroup_struct.format(body="\n".join(testgroup_members)))

## XXX: may be we could have `--output <filename>` argument...
# Don't depend on what system locale is set, use utf8 encoding.
sys.stdout.buffer.write("\n\n".join(output).encode("utf8"))