# Copyright (C) 2014 The Android Open Source Project
#
# 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.
#
# This depends on gerrit-plugin-api and optionally
# gerrit-plugin-gwtui (GWT module) and gwt-user libraries to be
# available under:
#
#     //lib/gerrit:plugin-api
#     //lib/gerrit:plugin-gwtui
#     //lib/gwt:user
#     //lib/gwt:dev
#
# To provide it maven_jar() or bucklet can be used in lib/gerrit/BUCK:
#
# include_defs('//bucklets/maven_jar.bucklet')
#
# VER = '2.10'
#
# maven_jar(
#   name = 'plugin-api',
#   id = 'com.google.gerrit:gerrit-plugin-api:' + VER',
# )
#
# maven_jar(
#   name = 'plugin-gwtui',
#   id = 'com.google.gerrit:gerrit-plugin-gwtui:' + VER',
# )
#

GWT_JVM_ARGS = ['-Xmx512m']

GWT_COMPILER_ARGS = [
  '-XdisableClassMetadata',
  '-XdisableCastChecking',
]

GERRIT_PLUGIN_API = ['//lib/gerrit:plugin-api']
GERRIT_GWT_API = ['//lib/gerrit:gwtui-api']

GWT_DEPS = [
  '//lib/gwt:user',
  '//lib/gwt:dev',
]

STANDALONE_MODE = True

def gerrit_plugin(
    name,
    deps = [],
    provided_deps = [],
    srcs = [],
    resources = [],
    gwt_module = None,
    manifest_entries = [],
    type = 'plugin',
    visibility = ['PUBLIC']):
  from multiprocessing import cpu_count
  from os import path,getcwd
  # TODO(davido): Remove this hack and replace all this mess with just
  # ROOT = get_base_path()
  # when this issue is fixed:
  # https://github.com/facebook/buck/issues/200
  # Or this PR is merged:
  # https://github.com/facebook/buck/pull/201
  ROOT = getcwd()
  while not path.lexists(path.join(ROOT, '.buckconfig')):
    ROOT = path.dirname(ROOT)
  if path.exists(path.join(ROOT, 'VERSION')):
    include_defs('//' + path.join(ROOT, 'VERSION'))
    mf_cmd = 'v=%s && ' % PLUGIN_VERSION
  elif path.exists(path.join(ROOT, '.git')):
    mf_cmd = 'v=$(git describe --always HEAD) && '
  else: # cannot retrieve plugin version, guessing '1.0'
    mf_cmd = 'v=1.0 && '
  mf_cmd += 'echo "Manifest-Version: 1.0" >$OUT && '
  mf_cmd += 'echo "Gerrit-ApiType: %s" >>$OUT && ' % type
  mf_cmd += 'echo "Implementation-Version: $v" >>$OUT && '
  mf_cmd += 'echo "Implementation-Vendor: Gerrit Code Review" >>$OUT'
  for line in manifest_entries:
    line = line.replace('$', '\$')
    mf_cmd += ' && echo "%s" >> $OUT' % line
  genrule(
    name = name + '__manifest',
    cmd = mf_cmd,
    out = 'MANIFEST.MF',
  )
  gwt_deps = []
  static_jars = []
  if gwt_module:
    gwt_deps = GWT_DEPS + GERRIT_GWT_API
    static_jars = [':%s-static-jar' % name]
  java_library(
    name = name + '__plugin',
    srcs = srcs,
    resources = resources,
    deps = deps,
    provided_deps = GERRIT_PLUGIN_API + provided_deps + gwt_deps,
    visibility = ['PUBLIC'],
  )
  if gwt_module:
    prebuilt_jar(
      name = '%s-static-jar' % name,
      binary_jar = ':%s-static' % name,
    )
    genrule(
      name = '%s-static' % name,
      cmd = 'mkdir -p $TMP/static' +
        ';unzip -qd $TMP/static $(location %s)' %
        ':%s__gwt_application' % name +
        ';cd $TMP' +
        ';zip -qr $OUT .',
      out = '%s-static.zip' % name,
    )
    gwt_binary(
      name = name + '__gwt_application',
      modules = [gwt_module],
      deps = gwt_deps,
      module_deps = [':%s__plugin' % name],
      local_workers = cpu_count(),
      strict = True,
      experimental_args = GWT_COMPILER_ARGS,
      vm_args = GWT_JVM_ARGS,
    )

  java_binary(
    name = name,
    manifest_file = ':%s__manifest' % name,
    merge_manifests = False,
    deps = [
      ':%s__plugin' % name,
    ] + static_jars,
    visibility = visibility,
  )