#!/bin/bash

# Copyright 2015 The Bazel Authors. All rights reserved.
#
# 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.

# General purpose method and values for bootstrapping bazel.

set -o errexit

DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
WORKSPACE_DIR="$(dirname $(dirname ${DIR}))"

JAVA_VERSION=${JAVA_VERSION:-1.8}
BAZELRC=${BAZELRC:-"/dev/null"}
PLATFORM="$(uname -s | tr 'A-Z' 'a-z')"

MACHINE_TYPE="$(uname -m)"
MACHINE_IS_64BIT='no'
if [ "${MACHINE_TYPE}" = 'amd64' -o "${MACHINE_TYPE}" = 'x86_64' ]; then
  MACHINE_IS_64BIT='yes'
fi

MACHINE_IS_ARM='no'
if [ "${MACHINE_TYPE}" = 'arm' -o "${MACHINE_TYPE}" = 'armv7l' -o "${MACHINE_TYPE}" = 'aarch64' ]; then
  MACHINE_IS_ARM='yes'
fi

# Extension for executables.
EXE_EXT=""
case "${PLATFORM}" in
msys*|mingw*)
  EXE_EXT=".exe"
esac

# Whether we display build messages or not.  We set this conditionally because
# the file including us or the user may already have defined VERBOSE to their
# liking.
: ${VERBOSE:=yes}

# List of functions to invoke on exit.
ATEXIT_HANDLERS=

# Registers a function to be invoked on exit.
#
# The handlers will be invoked at exit time in the order they were registered.
# See comments in run_atexit for more details.
function atexit() {
  local handler="${1}"; shift

  [ -n "${ATEXIT_HANDLERS}" ] || trap 'run_atexit_handlers $?' EXIT
  ATEXIT_HANDLERS="${ATEXIT_HANDLERS} ${handler}"
}

# Exit routine to run all registered atexit handlers.
#
# If the program exited with an error, this exit routine will also exit with the
# same error.  However, if the program exited successfully, this exit routine
# will only exit successfully if the atexit handlers succeed.
function run_atexit_handlers() {
  local exit_code="$?"

  local failed=no
  for handler in ${ATEXIT_HANDLERS}; do
    eval "${handler}" || failed=yes
  done

  trap - EXIT  # Reset exit handler to prevent double execution.
  if [ ${exit_code} -ne 0 ]; then
    exit ${exit_code}
  else
    if [ "${failed}" = yes ]; then
      echo "Program tried to exit successfully but atexit routines failed" 1>&2
      exit 1
    else
      exit 0
    fi
  fi
}

function tempdir() {
  local tmp=${TMPDIR:-/tmp}
  local DIR="$(mktemp -d ${tmp%%/}/bazel.XXXXXXXX)"
  mkdir -p "${DIR}"
  eval "cleanup_tempdir() { rm -rf '${DIR}'; }"
  atexit cleanup_tempdir
  NEW_TMPDIR="${DIR}"
}
tempdir
OUTPUT_DIR=${NEW_TMPDIR}
errfile=${OUTPUT_DIR}/errors
eval "cleanup_errfile() {
        if [ -f '${errfile}' ]; then
          cat '${errfile}' 1>&2;
        fi;
      }"
atexit cleanup_errfile
phasefile=${OUTPUT_DIR}/phase
eval "cleanup_phasefile() {
        if [ -f '${phasefile}' ]; then
          echo 1>&2;
          cat '${phasefile}' 1>&2;
        fi;
      }"
atexit cleanup_phasefile

# Excutes a command respecting the current verbosity settings.
#
# If VERBOSE is yes, the command itself and its output are printed.
# If VERBOSE is no, the command's output is only displayed in case of failure.
#
# Exits the script if the command fails.
function run() {
  if [ "${VERBOSE}" = yes ]; then
    echo "${@}"
    "${@}" || exit $?
  else
    echo "${@}" >"${errfile}"
    # The exit here is needed because "set -e" on the shell does not cause
    # errors in functions to exit in all cases.  We should probably disable
    # "set -e" altogether and add explicit error handling where necessary.
    "${@}" >>"${errfile}" 2>&1 || exit $?
    rm "${errfile}"
  fi
}

function fail() {
  local exitCode=$?
  if [[ "$exitCode" = "0" ]]; then
    exitCode=1
  fi
  echo >&2
  echo "$1" >&2
  exit $exitCode
}

function display() {
  if [[ -z "${QUIETMODE}" ]]; then
    echo -e "$@" >&2
  fi
}

function log() {
  echo -n "." >&2
  echo "$1" >${phasefile}
}

function clear_log() {
  echo >&2
  rm -f ${phasefile}
}

LEAVES="\xF0\x9F\x8D\x83"
INFO="\033[32mINFO\033[0m:"
WARNING="\033[31mWARN\033[0m:"

first_step=1
function new_step() {
  rm -f ${phasefile}
  local new_line=
  if [ -n "${first_step}" ]; then
    first_step=
  else
    new_line="\n"
  fi
  display -n "$new_line$LEAVES  $1"
}

function git_sha1() {
  if [ -x "$(which git || true)" ] && [ -d .git ]; then
    git rev-parse --short HEAD 2>/dev/null || true
  fi
}

function git_date() {
  if [ -x "$(which git || true)" ] && [ -d .git ]; then
    git log -1 --pretty=%ai | cut -d " " -f 1 || true
  fi
}

# Get the latest release version and append the date of
# the last commit if any.
function get_last_version() {
  if [ -f "CHANGELOG.md" ]; then
    local version="$(fgrep -m 1 '## Release' CHANGELOG.md \
                       | sed -E 's|.*Release (.*) \(.*\)|\1|')"
  else
    local version=""
  fi

  local date="$(git_date)"
  if [ -z "${version-}" ]; then
    version="unknown"
  fi
  if [ -n "${date-}" ]; then
    date="$(date +%Y-%m-%d)"
  fi
  echo "${version}-${date}"
}

if [[ ${PLATFORM} == "darwin" ]]; then
  function md5_file() {
    echo $(cat $1 | md5) $1
  }
else
  function md5_file() {
    md5sum $1
  }
fi

# Gets the java version from JAVA_HOME
# Sets JAVAC and JAVAC_VERSION with respectively the path to javac and
# the version of javac.
function get_java_version() {
  test -z "$JAVA_HOME" && fail "JDK not found, please set \$JAVA_HOME."
  JAVAC="${JAVA_HOME}/bin/javac"
  [[ -x "${JAVAC}" ]] \
    || fail "JAVA_HOME ($JAVA_HOME) is not a path to a working JDK."

  JAVAC_VERSION=$("${JAVAC}" -version 2>&1)
  if [[ "$JAVAC_VERSION" =~ ^"javac "(1\.([789]|[1-9][0-9])).*$ ]]; then
    JAVAC_VERSION=${BASH_REMATCH[1]}
  else
    fail "Cannot determine JDK version, please set \$JAVA_HOME."
  fi
}

# Return the target that a bind point to, using Bazel query.
function get_bind_target() {
  $BAZEL --bazelrc=${BAZELRC} --nomaster_bazelrc \
    query "deps($1, 1) - $1"
}