#!/usr/bin/env python
# Copyright (c) 2020, the R8 project authors. Please see the AUTHORS file
# for details. All rights reserved. Use of this source code is governed by a
# BSD-style license that can be found in the LICENSE file.

import argparse
import os
import subprocess
import sys
import zipfile

import archive
import jdk
import retrace
import utils


def make_parser():
  parser = argparse.ArgumentParser(description = 'Compile a dump artifact.')
  parser.add_argument(
    '-d',
    '--dump',
    help='Dump file to compile',
    default=None)
  parser.add_argument(
    '-c',
    '--compiler',
    help='Compiler to use (default read from version file)',
    default=None)
  parser.add_argument(
    '-v',
    '--version',
    help='Compiler version to use (default read from dump version file).'
      'Valid arguments are:'
      '  "master" to run from your own tree,'
      '  "X.Y.Z" to run a specific version, or'
      '  <hash> to run that hash from master.',
    default=None)
  parser.add_argument(
    '--nolib',
    help='Use the non-lib distribution (default uses the lib distribution)',
    default=False,
    action='store_true')
  parser.add_argument(
    '--ea',
    help='Enable Java assertions when running the compiler (default disabled)',
    default=False,
    action='store_true')
  parser.add_argument(
      '--debug-agent',
      help='Enable Java debug agent and suspend compilation (default disabled)',
      default=False,
      action='store_true')
  return parser

def error(msg):
  print msg
  sys.exit(1)

class Dump(object):

  def __init__(self, directory):
    self.directory = directory

  def if_exists(self, name):
    f = os.path.join(self.directory, name)
    if os.path.exists(f):
      return f
    return None

  def program_jar(self):
    return self.if_exists('program.jar')

  def library_jar(self):
    return self.if_exists('library.jar')

  def classpath_jar(self):
    return self.if_exists('classpath.jar')

  def config_file(self):
    return self.if_exists('proguard.config')

  def version_file(self):
    return self.if_exists('r8-version')

  def version(self):
    f = self.version_file()
    if f:
      return open(f).read().split(' ')[0]
    return None

def read_dump(args, temp):
  if args.dump is None:
    error("A dump file must be specified")
  dump_file = zipfile.ZipFile(args.dump, 'r')
  with utils.ChangedWorkingDirectory(temp):
    dump_file.extractall()
    return Dump(temp)

def determine_version(args, dump):
  if args.version is None:
    return dump.version()
  return args.version

def determine_compiler(args, dump):
  compilers = ('d8', 'r8', 'r8full')
  if args.compiler not in compilers:
    error("Unable to determine a compiler to use. Valid options: %s" % compilers.join(', '))
  return args.compiler

def determine_output(args, temp):
  return os.path.join(temp, 'out.jar')

def download_distribution(args, version, temp):
  if version == 'master':
    return utils.R8_JAR if args.nolib else utils.R8LIB_JAR
  name = 'r8.jar' if args.nolib else 'r8lib.jar'
  source = archive.GetUploadDestination(version, name, is_hash(version))
  dest = os.path.join(temp, 'r8.jar')
  utils.download_file_from_cloud_storage(source, dest)
  return dest

def prepare_wrapper(dist, temp):
  wrapper_file = os.path.join(
      utils.REPO_ROOT,
      'src/main/java/com/android/tools/r8/utils/CompileDumpCompatR8.java')
  subprocess.check_output([
    jdk.GetJavacExecutable(),
    wrapper_file,
    '-d', temp,
    '-cp', dist,
    ])
  return temp

def is_hash(version):
  return len(version) == 40

def run(args, otherargs):
  with utils.TempDir() as temp:
    dump = read_dump(args, temp)
    version = determine_version(args, dump)
    compiler = determine_compiler(args, dump)
    out = determine_output(args, temp)
    jar = download_distribution(args, version, temp)
    wrapper_dir = prepare_wrapper(jar, temp)
    cmd = [jdk.GetJavaExecutable()]
    if args.debug_agent:
      if not args.nolib:
        print "WARNING: Running debugging agent on r8lib is questionable..."
      cmd.append(
          '-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=*:5005')
    if args.ea:
      cmd.append('-ea')
    cmd.extend(['-cp', '%s:%s' % (wrapper_dir, jar)])
    if compiler == 'd8':
      cmd.append('com.android.tools.r8.D8')
    if compiler.startswith('r8'):
      cmd.append('com.android.tools.r8.utils.CompileDumpCompatR8')
    if compiler == 'r8':
      cmd.append('--compat')
    cmd.append(dump.program_jar())
    cmd.extend(['--output', out])
    if dump.library_jar():
      cmd.extend(['--lib', dump.library_jar()])
    if dump.classpath_jar():
      cmd.extend(['--classpath', dump.classpath_jar()])
    if compiler != 'd8' and dump.config_file():
      cmd.extend(['--pg-conf', dump.config_file()])
    cmd.extend(otherargs)
    utils.PrintCmd(cmd)
    try:
      print subprocess.check_output(cmd, stderr=subprocess.STDOUT)
      return 0
    except subprocess.CalledProcessError, e:
      print e.output
      if not args.nolib:
        stacktrace = os.path.join(temp, 'stacktrace')
        open(stacktrace, 'w+').write(e.output)
        local_map = utils.R8LIB_MAP if version == 'master' else None
        hash_or_version = None if version == 'master' else version
        print "=" * 80
        print " RETRACED OUTPUT"
        print "=" * 80
        retrace.run(local_map, hash_or_version, stacktrace, is_hash(version))
      return 1

if __name__ == '__main__':
  (args, otherargs) = make_parser().parse_known_args(sys.argv[1:])
  sys.exit(run(args, otherargs))