from __future__ import absolute_import
import os
import tempfile
import subprocess
import sys
import platform

import lit.Test
import lit.TestRunner
import lit.util
from lit.formats.base import TestFormat


class LLDBTest(TestFormat):
    def __init__(self, dotest_cmd):
        self.dotest_cmd = dotest_cmd

    def getTestsInDirectory(self, testSuite, path_in_suite, litConfig,
                            localConfig):
        source_path = testSuite.getSourcePath(path_in_suite)
        for filename in os.listdir(source_path):
            # Ignore dot files and excluded tests.
            if (filename.startswith('.') or filename in localConfig.excludes):
                continue

            # Ignore files that don't start with 'Test'.
            if not filename.startswith('Test'):
                continue

            filepath = os.path.join(source_path, filename)
            if not os.path.isdir(filepath):
                base, ext = os.path.splitext(filename)
                if ext in localConfig.suffixes:
                    yield lit.Test.Test(testSuite, path_in_suite +
                                        (filename, ), localConfig)

    def execute(self, test, litConfig):
        if litConfig.noExecute:
            return lit.Test.PASS, ''

        if not getattr(test.config, 'lldb_enable_python', False):
            return (lit.Test.UNSUPPORTED, 'Python module disabled')

        if test.config.unsupported:
            return (lit.Test.UNSUPPORTED, 'Test is unsupported')

        testPath, testFile = os.path.split(test.getSourcePath())

        # The Python used to run lit can be different from the Python LLDB was
        # build with.
        executable = test.config.python_executable

        isLuaTest = testFile == test.config.lua_test_entry

        # On Windows, the system does not always correctly interpret
        # shebang lines.  To make sure we can execute the tests, add
        # python exe as the first parameter of the command.
        cmd = [executable] + self.dotest_cmd + [testPath, '-p', testFile]

        if isLuaTest:
            luaExecutable = test.config.lua_executable
            cmd.extend(['--env', 'LUA_EXECUTABLE=%s' % luaExecutable])

        timeoutInfo = None
        try:
            out, err, exitCode = lit.util.executeCommand(
                cmd,
                env=test.config.environment,
                timeout=litConfig.maxIndividualTestTime)
        except lit.util.ExecuteCommandTimeoutException as e:
            out = e.out
            err = e.err
            exitCode = e.exitCode
            timeoutInfo = 'Reached timeout of {} seconds'.format(
                litConfig.maxIndividualTestTime)

        if sys.version_info.major == 2:
            # In Python 2, string objects can contain Unicode characters. Use
            # the non-strict 'replace' decoding mode. We cannot use the strict
            # mode right now because lldb's StringPrinter facility and the
            # Python utf8 decoder have different interpretations of which
            # characters are "printable". This leads to Python utf8 decoding
            # exceptions even though lldb is behaving as expected.
            out = out.decode('utf-8', 'replace')
            err = err.decode('utf-8', 'replace')

        output = """Script:\n--\n%s\n--\nExit Code: %d\n""" % (
            ' '.join(cmd), exitCode)
        if timeoutInfo is not None:
            output += """Timeout: %s\n""" % (timeoutInfo,)
        output += "\n"

        if out:
            output += """Command Output (stdout):\n--\n%s\n--\n""" % (out,)
        if err:
            output += """Command Output (stderr):\n--\n%s\n--\n""" % (err,)

        if timeoutInfo:
            return lit.Test.TIMEOUT, output

        if exitCode:
            if 'XPASS:' in out or 'XPASS:' in err:
                return lit.Test.XPASS, output

            # Otherwise this is just a failure.
            return lit.Test.FAIL, output

        has_unsupported_tests = 'UNSUPPORTED:' in out or 'UNSUPPORTED:' in err
        has_passing_tests = 'PASS:' in out or 'PASS:' in err
        if has_unsupported_tests and not has_passing_tests:
            return lit.Test.UNSUPPORTED, output

        passing_test_line = 'RESULT: PASSED'
        if passing_test_line not in out and passing_test_line not in err:
            return lit.Test.UNRESOLVED, output

        return lit.Test.PASS, output