#!/usr/bin/env python
# emacs-mode: -*-python-*-
"""
test_pyenvlib -- uncompyle and verify Python libraries

Usage-Examples:

  test_pyenvlib.py --all		# decompile all tests (suite + libs)
  test_pyenvlib.py --all --verify	# decomyile all tests and verify results
  test_pyenvlib.py --test		# decompile only the testsuite
  test_pyenvlib.py --2.7.12 --verify	# decompile and verify python lib 2.7.11
  test_pyenvlib.py --3.6.4 --max 10	# decompile first 10 of 3.6.4

Adding own test-trees:

Step 1) Edit this file and add a new entry to 'test_options', eg.
          test_options['mylib'] = ('/usr/lib/mylib', PYOC, 'mylib')
Step 2: Run the test:
	  test_pyenvlib --mylib	  # decompile 'mylib'
	  test_pyenvlib --mylib --verify # decompile verify 'mylib'
"""

from __future__ import print_function

import os, time, re, shutil, sys
from fnmatch import fnmatch

from uncompyle6 import main, PYTHON3
import xdis.magics as magics

# ----- configure this for your needs

python_versions = [v for v in magics.python_versions if re.match("^[0-9.]+$", v)]

# FIXME: we should remove Python versions that we don't support.
# These include Jython, and Python bytecode changes pre release.

TEST_VERSIONS = (
    "pypy3-2.4.0",
    "pypy-2.6.1",
    "pypy-5.0.1",
    "pypy-5.3.1",
    "pypy3.5-5.7.1-beta",
    "pypy3.5-5.9.0",
    "pypy3.5-6.0.0",
    "pypy3.6-7.1.0",
    "pypy3.6-7.1.1",
    "pypy3.6-7.2.0",
    "native",
) + tuple(python_versions)


target_base = "/tmp/py-dis/"
lib_prefix = os.path.join(os.environ["HOME"], ".pyenv/versions")

PYC = ("*.pyc",)
PYO = ("*.pyo",)
PYOC = ("*.pyc", "*.pyo")

# -----

test_options = {
    # name: (src_basedir, pattern, output_base_suffix)
    "test": ("./test", PYOC, "test"),
    "max=": 200,
}

for vers in TEST_VERSIONS:
    if vers.startswith("pypy"):
        if vers.startswith("pypy3."):
            short_vers = vers[4:6]
        else:
            short_vers = vers[0:-2]

        test_options[vers] = (
            os.path.join(lib_prefix, vers, "lib_pypy"),
            PYC,
            "python-lib" + short_vers,
        )
    else:
        if vers == "native":
            short_vers = os.path.basename(sys.path[-1])
            from xdis import PYTHON_VERSION
            if PYTHON_VERSION > 3.0:
                PYC = "*.cpython-%d.pyc" % int(PYTHON_VERSION * 10)
            test_options[vers] = (sys.path[-1], PYC, short_vers)
        else:
            short_vers = vers[:3]
            test_options[vers] = (
                os.path.join(lib_prefix, vers, "lib", "python" + short_vers),
                PYC,
                "python-lib" + short_vers,
            )


def do_tests(
    src_dir, patterns, target_dir, start_with=None, do_verify=False, max_files=200
):
    def visitor(files, dirname, names):
        files.extend(
            [
                os.path.normpath(os.path.join(dirname, n))
                for n in names
                for pat in patterns
                if fnmatch(n, pat)
            ]
        )

    files = []
    cwd = os.getcwd()
    os.chdir(src_dir)
    if PYTHON3:
        for root, dirname, names in os.walk(os.curdir):
            files.extend(
                [
                    os.path.normpath(os.path.join(root, n))
                    for n in names
                    for pat in patterns
                    if fnmatch(n, pat)
                ]
            )
            pass
        pass
    else:
        os.path.walk(os.curdir, visitor, files)
    os.chdir(cwd)
    files.sort()

    if start_with:
        try:
            start_with = files.index(start_with)
            files = files[start_with:]
            print(">>> starting with file", files[0])
        except ValueError:
            pass

    if len(files) > max_files:
        files = [file for file in files if not "site-packages" in file and (file.endswith(".pyo") or file.endswith(".pyc"))]
        files = [file for file in files if not "test" in file and (file.endswith(".pyo") or file.endswith(".pyc"))]
        if len(files) > max_files:
            # print("Number of files %d - truncating to last 200" % len(files))
            print(
                "Number of files %d - truncating to first %s" % (len(files), max_files)
            )
            files = files[:max_files]

    print(time.ctime())
    (tot_files, okay_files, failed_files, verify_failed_files) = main.main(
        src_dir, target_dir, files, [], do_verify=do_verify
    )
    print(time.ctime())
    return verify_failed_files + failed_files


if __name__ == "__main__":
    import getopt, sys

    do_coverage = do_verify = False
    test_dirs = []
    start_with = None

    test_options_keys = list(test_options.keys())
    test_options_keys.sort()
    opts, args = getopt.getopt(
        sys.argv[1:],
        "",
        [
            "start-with=",
            "verify",
            "verify-run",
            "syntax-verify",
            "max=",
            "coverage",
            "all",
        ]
        + test_options_keys,
    )
    vers = ""

    for opt, val in opts:
        if opt == "--verify":
            do_verify = "strong"
        elif opt == "--syntax-verify":
            do_verify = "weak"
        elif opt == "--verify-run":
            do_verify = "verify-run"
        elif opt == "--coverage":
            do_coverage = True
        elif opt == "--start-with":
            start_with = val
        elif opt[2:] in test_options_keys:
            triple = test_options[opt[2:]]
            vers = triple[-1]
            test_dirs.append(triple)
        elif opt == "--max":
            test_options["max="] = int(val)
        elif opt == "--all":
            vers = "all"
            for val in test_options_keys:
                test_dirs.append(test_options[val])

    if do_coverage:
        os.environ["SPARK_PARSER_COVERAGE"] = "/tmp/spark-grammar-%s.cover" % vers

    failed = 0
    for src_dir, pattern, target_dir in test_dirs:
        if os.path.exists(src_dir):
            target_dir = os.path.join(target_base, target_dir)
            if os.path.exists(target_dir):
                shutil.rmtree(target_dir, ignore_errors=1)
            failed += do_tests(
                src_dir,
                pattern,
                target_dir,
                start_with,
                do_verify,
                test_options["max="],
            )
        else:
            print("### Path %s doesn't exist; skipping" % src_dir)
            pass
        pass
    sys.exit(failed)

# python 1.5:

# test/re_tests		memory error
# test/test_b1		memory error

# Verification notes:
# - xdrlib fails verification due the same lambda used twice
#   (verification is successful when using original .pyo as
#   input)
#