# Copyright (c) 2015 - present Facebook, Inc.
# All rights reserved.
#
# This source code is licensed under the BSD style license found in the
# LICENSE file in the root directory of this source tree. An additional grant
# of patent rights can be found in the PATENTS file in the same directory.

import logging
import os
import util
import tempfile

from inferlib import config, jwlib, utils

MODULE_NAME = __name__
MODULE_DESCRIPTION = '''Run analysis of code built with a command like:
gradle [options] [task]

Analysis examples:
infer -- gradle build
infer -- ./gradlew build'''
LANG = ['java']


def gen_instance(*args):
    return GradleCapture(*args)


# This creates an empty argparser for the module, which provides only
# description/usage information and no arguments.
create_argparser = util.base_argparser(MODULE_DESCRIPTION, MODULE_NAME)


class GradleCapture:

    def __init__(self, args, cmd):
        self.args = args
        # TODO: make the extraction of targets smarter
        self.build_cmd = [cmd[0], '--debug'] + cmd[1:]
        # That contains javac version as well
        version_str = util.run_cmd_ignore_fail([cmd[0], '--version'])
        path = os.path.join(self.args.infer_out,
                            config.JAVAC_FILELISTS_FILENAME)
        if not os.path.exists(path):
            os.mkdir(path)
        logging.info('Running with:\n' + utils.decode(version_str))

    def get_infer_commands(self, verbose_output):
        argument_start_pattern = ' Compiler arguments: '
        calls = []
        seen_build_cmds = set([])
        for line in verbose_output:
            if argument_start_pattern in line:
                content = line.partition(argument_start_pattern)[2].strip()
                # if we're building both the debug and release configuration
                # and the build commands are identical up to "release/debug",
                # only do capture for one set of commands
                build_agnostic_cmd = content.replace('release', 'debug')
                if build_agnostic_cmd in seen_build_cmds:
                    continue
                seen_build_cmds.add(build_agnostic_cmd)
                javac_arguments = content.split(' ')
                java_files = []
                java_args = []
                for java_arg in javac_arguments:
                    if java_arg.endswith('.java'):
                        java_files.append(java_arg)
                    else:
                        java_args.append(java_arg)
                with tempfile.NamedTemporaryFile(
                        mode='w',
                        suffix='.txt',
                        prefix='gradle_',
                        dir=os.path.join(self.args.infer_out,
                                         config.JAVAC_FILELISTS_FILENAME),
                        delete=False) as sources:
                    sources.write('\n'.join(map(utils.encode, java_files)))
                    sources.flush()
                    java_args.append('@' + sources.name)
                capture = jwlib.create_infer_command(java_args)
                calls.append(capture)
        return calls

    def capture(self):
        print('Running and capturing gradle compilation...')
        cmds = self.get_infer_commands(util.get_build_output(self.build_cmd))
        clean_cmd = '%s clean' % self.build_cmd[0]
        return util.run_compilation_commands(cmds, clean_cmd)