#!/usr/bin/env python3
#
# Copyright 2015 WebAssembly Community Group participants
#
# Licensed 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.

import functools
import glob
import io
import os
import subprocess
import sys
import unittest
from contextlib import contextmanager
from multiprocessing.pool import ThreadPool
from pathlib import Path

from scripts.test import binaryenjs, finalize, shared, support, wasm2js, wasm_opt
from scripts.test.shared import print_heading

assert sys.version_info >= (3, 10), 'requires Python 3.10'


def get_changelog_version():
    with open(os.path.join(shared.options.binaryen_root, 'CHANGELOG.md')) as f:
        lines = f.readlines()
    lines = [line for line in lines if len(line.split()) == 1]
    lines = [line for line in lines if line.startswith('v')]
    version = lines[0][1:]
    print(f"Parsed CHANGELOG.md version: {version}")
    return int(version)


def run_version_tests():
    print_heading('checking --version ...')

    not_executable_suffix = ['.DS_Store', '.txt', '.js', '.ilk', '.pdb', '.dll', '.wasm', '.manifest']
    executable_prefix = ['wasm']
    bin_files = [os.path.join(shared.options.binaryen_bin, f) for f in os.listdir(shared.options.binaryen_bin)]
    executables = [f for f in bin_files if os.path.isfile(f) and
                   not any(f.endswith(s) for s in not_executable_suffix) and
                   any(os.path.basename(f).startswith(s) for s in executable_prefix)]
    executables = sorted(executables)
    assert executables

    changelog_version = get_changelog_version()
    for e in executables:
        print(f'.. {e} --version')
        proc = subprocess.run([e, '--version'], capture_output=True, text=True)
        assert len(proc.stderr) == 0, f'Expected no stderr, got:\n{proc.stderr}'
        out = proc.stdout
        assert os.path.basename(e).replace('.exe', '') in out, f'Expected version to contain program name, got:\n{out}'
        assert len(out.strip().splitlines()) == 1, f'Expected only version info, got:\n{out}'
        parts = out.split()
        assert parts[1] == 'version'
        version = int(parts[2])
        assert version == changelog_version


def run_wasm_dis_tests():
    print_heading('checking wasm-dis on provided binaries...')

    for t in shared.get_tests(shared.options.binaryen_test, ['.wasm']):
        print('..', os.path.basename(t))
        cmd = shared.WASM_DIS + [t]
        if os.path.isfile(t + '.map'):
            cmd += ['--source-map', t + '.map']

        actual = support.run_command(cmd)
        shared.fail_if_not_identical_to_file(actual, t + '.fromBinary')

        # also verify there are no validation errors
        with shared.with_pass_debug():
            cmd = shared.WASM_OPT + [t, '-all', '-q']
            support.run_command(cmd)


def run_crash_tests():
    print_heading("checking we don't crash on tricky inputs...")

    for t in shared.get_tests(shared.get_test_dir('crash'), ['.wast', '.wasm']):
        print('..', os.path.basename(t))
        cmd = shared.WASM_OPT + [t]
        # expect a parse error to be reported
        support.run_command(cmd, expected_err='parse exception:', err_contains=True, expected_status=1)


def run_dylink_tests():
    print_heading('we emit dylink sections properly...')

    dylink_tests = glob.glob(os.path.join(shared.options.binaryen_test, 'dylib*.wasm'))
    for t in sorted(dylink_tests):
        print('..', os.path.basename(t))
        cmd = shared.WASM_OPT + [t, '-o', 'a.wasm']
        support.run_command(cmd)
        with open('a.wasm', 'rb') as output:
            index = output.read().find(b'dylink')
            print('  ', index)
            assert index == 11, 'dylink section must be first, right after the magic number etc.'


def run_ctor_eval_tests():
    print_heading('checking wasm-ctor-eval...')

    for t in shared.get_tests(shared.get_test_dir('ctor-eval'), ['.wast', '.wasm']):
        print('..', os.path.basename(t))
        ctors = open(t + '.ctors').read().strip()
        cmd = shared.WASM_CTOR_EVAL + [t, '-all', '-o', 'a.wat', '-S', '--ctors', ctors]
        if 'ignore-external-input' in t:
            cmd += ['--ignore-external-input']
        if 'results' in t:
            cmd += ['--kept-exports', 'test1,test3']
        support.run_command(cmd)
        actual = open('a.wat').read()
        out = t + '.out'
        shared.fail_if_not_identical_to_file(actual, out)


def run_wasm_metadce_tests():
    print_heading('checking wasm-metadce')

    for t in shared.get_tests(shared.get_test_dir('metadce'), ['.wast', '.wasm']):
        print('..', os.path.basename(t))
        graph = t + '.graph.txt'
        cmd = shared.WASM_METADCE + [t, '--graph-file=' + graph, '-o', 'a.wat', '-S', '-all']
        stdout = support.run_command(cmd)
        expected = t + '.dced'
        with open('a.wat') as seen:
            shared.fail_if_not_identical_to_file(seen.read(), expected)
        shared.fail_if_not_identical_to_file(stdout, expected + '.stdout')


def run_wasm_reduce_tests():
    if not shared.has_shell_timeout():
        print_heading('skipping wasm-reduce testcases')
        return

    print_heading('checking wasm-reduce testcases')

    # fixed testcases
    for t in shared.get_tests(shared.get_test_dir('reduce'), ['.wast']):
        print('..', os.path.basename(t))
        # convert to wasm
        support.run_command(shared.WASM_AS + [t, '-o', 'a.wasm', '-all'])
        cmd = shared.WASM_OPT[0]
        support.run_command(shared.WASM_REDUCE + ['a.wasm', f'--command={cmd} b.wasm --fuzz-exec -all ', '-t', 'b.wasm', '-w', 'c.wasm', '--timeout=4'])
        expected = t + '.txt'
        support.run_command(shared.WASM_DIS + ['c.wasm', '-o', 'a.wat'])
        with open('a.wat') as seen:
            shared.fail_if_not_identical_to_file(seen.read(), expected)

    # run on a nontrivial fuzz testcase, for general coverage
    # this is very slow in ThreadSanitizer, so avoid it there
    if 'fsanitize=thread' not in str(os.environ):
        print_heading('checking wasm-reduce fuzz testcase')
        # TODO: re-enable multivalue once it is better optimized
        support.run_command(shared.WASM_OPT + [os.path.join(shared.options.binaryen_test, 'lit/basic/signext.wast'), '-ttf', '-Os', '-o', 'a.wasm', '--detect-features', '--disable-multivalue'])
        before = os.stat('a.wasm').st_size
        cmd = shared.WASM_OPT[0]
        support.run_command(shared.WASM_REDUCE + ['a.wasm', f'--command={cmd} b.wasm --fuzz-exec --detect-features', '-t', 'b.wasm', '-w', 'c.wasm'])
        after = os.stat('c.wasm').st_size
        # This number is a custom threshold to check if we have shrunk the
        # output sufficiently
        assert after < 0.85 * before, [before, after]


def run_spec_test(wast, stdout=None):
    cmd = shared.WASM_SHELL + [wast]
    output = support.run_command(cmd, stdout=stdout, stderr=subprocess.PIPE)
    # filter out binaryen interpreter logging that the spec suite
    # doesn't expect
    filtered = [line for line in output.splitlines() if not line.startswith('[trap')]
    return '\n'.join(filtered) + '\n'


def run_opt_test(wast, stdout=None):
    # check optimization validation
    cmd = shared.WASM_OPT + [wast, '-O', '-all', '-q']
    support.run_command(cmd, stdout=stdout)


def check_expected(actual, expected, stdout=None):
    if expected and os.path.exists(expected):
        expected = open(expected).read()
        print('       (using expected output)', file=stdout)
        actual = actual.strip()
        expected = expected.strip()
        if actual != expected:
            shared.fail(actual, expected)


UNSPLITTABLE_TESTS = [Path(x) for x in [
    "spec/testsuite/instance.wast",
    "spec/instance.wast",

    # TODO: support module splitting for (thread ...) blocks
    "spec/threads/*"]]


def is_splittable(wast: Path):
    return not any(wast.match(unsplittable_test) for unsplittable_test in UNSPLITTABLE_TESTS)


def run_one_spec_test(wast: Path, stdout=None):
    test_name = wast.name

    # /path/to/binaryen/test/spec/foo.wast -> test-spec-foo
    base_name = "-".join(wast.relative_to(Path(shared.options.binaryen_root)).with_suffix("").parts)

    print('..', test_name, file=stdout)
    # windows has some failures that need to be investigated
    if test_name == 'names.wast' and shared.skip_if_on_windows('spec: ' + test_name):
        return

    expected = os.path.join(shared.get_test_dir('spec'), 'expected-output', test_name + '.log')

    # some spec tests should fail (actual process failure, not just assert_invalid)
    try:
        actual = run_spec_test(str(wast), stdout=stdout)
    except Exception as e:
        if ('wasm-validator error' in str(e) or 'error: ' in str(e)) and '.fail.' in test_name:
            print('<< test failed as expected >>', file=stdout)
            return  # don't try all the binary format stuff TODO
        else:
            shared.fail_with_error(str(e))
            raise

    check_expected(actual, expected, stdout=stdout)

    if not is_splittable(wast):
        return

    # check binary format. here we can verify execution of the final
    # result, no need for an output verification
    actual = ''
    transformed_path = base_name + ".transformed"
    with open(transformed_path, 'w') as transformed_spec_file:
        for i, (module, asserts) in enumerate(support.split_wast(str(wast))):
            if not module:
                # Skip any initial assertions that don't have a module
                continue
            print(f'        testing split module {i}', file=stdout)
            split_name = base_name + f'_split{i}.wast'
            support.write_wast(split_name, module)
            run_opt_test(split_name, stdout=stdout)    # also that our optimizer doesn't break on it

            result_wast_file = shared.binary_format_check(split_name, verify_final_result=False, base_name=base_name, stdout=stdout)
            with open(result_wast_file) as f:
                result_wast = f.read()
                # add the asserts, and verify that the test still passes
                transformed_spec_file.write(result_wast + '\n' + '\n'.join(asserts))

    # compare all the outputs to the expected output
    actual = run_spec_test(transformed_path, stdout=stdout)
    check_expected(actual, os.path.join(shared.get_test_dir('spec'), 'expected-output', test_name + '.log'), stdout=stdout)


def run_spec_test_with_wrapped_stdout(wast: Path):
    """Run a single spec test while capturing stdout.

    Return (bool, str) where the first element is whether the test was
    successful and the second is the combined stdout and stderr of the test.
    """
    out = io.StringIO()
    try:
        run_one_spec_test(wast, stdout=out)
    except Exception as e:
        shared.num_failures += 1
        # Serialize exceptions into the output string buffer
        # so they can be reported on the main thread.
        print(e, file=out)
        return False, out.getvalue()
    return True, out.getvalue()


@contextmanager
def red_output(file=sys.stdout):
    print("\033[31m", end="", file=file)
    try:
        yield
    finally:
        print("\033[0m", end="", file=file)


def red_stderr():
    return red_output(file=sys.stderr)


def run_spec_tests():
    print_heading('checking wasm-shell spec testcases...')

    worker_count = os.cpu_count()
    print("Running with", worker_count, "workers")
    test_paths = (Path(x) for x in shared.options.spec_tests)

    failed_stdouts = []
    with ThreadPool(processes=worker_count) as pool:
        try:
            for success, stdout in pool.imap_unordered(run_spec_test_with_wrapped_stdout, test_paths):
                if success:
                    print(stdout, end="")
                    continue

                failed_stdouts.append(stdout)
                if shared.options.abort_on_first_failure:
                    with red_stderr():
                        print("Aborted spec test suite execution after first failure. Set --no-fail-fast to disable this.", file=sys.stderr)
                    break
        except KeyboardInterrupt:
            # Hard exit to avoid threads continuing to run after Ctrl-C.
            # There's no concern of deadlocking during shutdown here.
            os._exit(1)

    if failed_stdouts:
        with red_stderr():
            print("Failed tests:", file=sys.stderr)
            for failed in failed_stdouts:
                print(failed, end="", file=sys.stderr)


def run_validator_tests():
    print_heading('running validation tests...')
    # Ensure the tests validate by default
    cmd = shared.WASM_AS + [os.path.join(shared.get_test_dir('validator'), 'invalid_export.wast'), '-o', 'a.wasm']
    support.run_command(cmd)
    cmd = shared.WASM_AS + [os.path.join(shared.get_test_dir('validator'), 'invalid_import.wast'), '-o', 'a.wasm']
    support.run_command(cmd)
    cmd = shared.WASM_AS + ['--validate=web', os.path.join(shared.get_test_dir('validator'), 'invalid_export.wast'), '-o', 'a.wasm']
    support.run_command(cmd, expected_status=1)
    cmd = shared.WASM_AS + ['--validate=web', os.path.join(shared.get_test_dir('validator'), 'invalid_import.wast'), '-o', 'a.wasm']
    support.run_command(cmd, expected_status=1)
    cmd = shared.WASM_AS + ['--validate=none', os.path.join(shared.get_test_dir('validator'), 'invalid_return.wast'), '-o', 'a.wasm']
    support.run_command(cmd)
    cmd = shared.WASM_AS + [os.path.join(shared.get_test_dir('validator'), 'invalid_number.wast'), '-o', 'a.wasm']
    support.run_command(cmd, expected_status=1)


def run_example_tests():
    print_heading('checking native example testcases...')
    if not shared.NATIVECC or not shared.NATIVEXX:
        shared.fail_with_error('Native compiler (e.g. gcc/g++) was not found in PATH!')
        return
    # windows + gcc will need some work
    if shared.skip_if_on_windows('example'):
        return

    for t in shared.get_tests(shared.get_test_dir('example')):
        output_file = 'example'
        cmd = ['-I' + os.path.join(shared.options.binaryen_root, 't'), '-g', '-pthread', '-o', output_file]
        if not t.endswith(('.c', '.cpp')):
            continue
        src = os.path.join(shared.get_test_dir('example'), t)
        expected = os.path.join(shared.get_test_dir('example'), '.'.join(t.split('.')[:-1]) + '.txt')
        # build the C file separately
        libpath = shared.options.binaryen_lib
        extra = [shared.NATIVECC, src, '-c', '-o', 'example.o',
                 '-I' + os.path.join(shared.options.binaryen_root, 'src'), '-g', '-L' + libpath, '-pthread']
        if src.endswith('.cpp'):
            extra += ['-std=c++' + str(shared.cxx_standard)]
        if os.environ.get('COMPILER_FLAGS'):
            for f in os.environ.get('COMPILER_FLAGS').split(' '):
                extra.append(f)
        print('build: ', ' '.join(extra))
        subprocess.check_call(extra)
        # Link against the binaryen C library DSO, using an executable-relative rpath
        cmd = ['example.o', '-L' + libpath, '-lbinaryen'] + cmd + ['-Wl,-rpath,' + libpath]
        print('  ', t, src, expected)
        if os.environ.get('COMPILER_FLAGS'):
            for f in os.environ.get('COMPILER_FLAGS').split(' '):
                cmd.append(f)
        cmd = [shared.NATIVEXX, '-std=c++' + str(shared.cxx_standard)] + cmd
        print('link: ', ' '.join(cmd))
        subprocess.check_call(cmd)
        print('run...', output_file)
        actual = subprocess.check_output([os.path.abspath(output_file)]).decode('utf-8')
        os.remove(output_file)
        shared.fail_if_not_identical_to_file(actual, expected)


def run_unittest():
    print_heading('checking unit tests...')

    # equivalent to `python -m unittest discover -s ./test -v`
    suite = unittest.defaultTestLoader.discover(os.path.dirname(shared.options.binaryen_test))
    result = unittest.TextTestRunner(verbosity=2, failfast=shared.options.abort_on_first_failure).run(suite)
    shared.num_failures += len(result.errors) + len(result.failures)


@shared.with_pass_debug()
def run_lit():
    lit_script = os.path.join(shared.options.binaryen_bin, 'binaryen-lit')
    lit_tests = os.path.join(shared.options.binaryen_root, 'test', 'lit')
    # lit expects to be run as its own executable
    cmd = [sys.executable, lit_script, lit_tests, '-vv']
    result = subprocess.run(cmd)
    if result.returncode != 0:
        shared.num_failures += 1


@shared.with_pass_debug()
def run_gtest():
    gtest = os.path.join(shared.options.binaryen_bin, 'binaryen-unittests')
    if not os.path.isfile(gtest):
        shared.warn('gtest binary not found - skipping tests')
    else:
        result = subprocess.run(gtest)
        if result.returncode != 0:
            shared.num_failures += 1


def test_suite(name, func):
    @functools.wraps(func)
    def wrapper(*args, **kwargs):
        assert not (shared.options.abort_on_first_failure and shared.num_failures)
        result = func(*args, **kwargs)
        if shared.options.abort_on_first_failure and shared.num_failures:
            raise Exception(f'test suite failed: {name}')
        return result
    return wrapper


TEST_SUITES = {
    'version': run_version_tests,
    'wasm-opt': wasm_opt.test_wasm_opt,
    'wasm-dis': run_wasm_dis_tests,
    'crash': run_crash_tests,
    'dylink': run_dylink_tests,
    'ctor-eval': run_ctor_eval_tests,
    'wasm-metadce': run_wasm_metadce_tests,
    'wasm-reduce': run_wasm_reduce_tests,
    'spec': run_spec_tests,
    'finalize': finalize.test_wasm_emscripten_finalize,
    'wasm2js': wasm2js.test_wasm2js,
    'validator': run_validator_tests,
    'example': run_example_tests,
    'unit': run_unittest,
    'binaryenjs': binaryenjs.test_binaryen_js,
    'lit': run_lit,
    'gtest': run_gtest,
}

TEST_SUITES = {name: test_suite(name, func) for name, func in TEST_SUITES.items()}


# Run all the tests
def main():
    all_suites = TEST_SUITES.keys()
    skip_by_default = ['binaryenjs']

    if shared.options.list_suites:
        for suite in all_suites:
            print(suite)
        return 0

    for r in shared.requested:
        if r not in all_suites:
            print(f'invalid test suite: {r} (see --list-suites)\n')
            return 1

    if not shared.requested:
        shared.requested = [s for s in all_suites if s not in skip_by_default]

    for test in shared.requested:
        TEST_SUITES[test]()
        print()

    # Check/display the results
    if shared.num_failures == 0:
        print_heading('success!')

    if shared.warnings:
        print('\n' + '\n'.join(shared.warnings))

    if shared.num_failures > 0:
        print_heading(f'{shared.num_failures} failures!')
        return 1

    return 0


if __name__ == '__main__':
    sys.exit(main())