#!/bin/sh
##
##  Copyright (c) 2014 The WebM project authors. All Rights Reserved.
##
##  Use of this source code is governed by a BSD-style license
##  that can be found in the LICENSE file in the root of the source
##  tree. An additional intellectual property rights grant can be found
##  in the file PATENTS.  All contributing project authors may
##  be found in the AUTHORS file in the root of the source tree.
##
##  This file contains shell code shared by test scripts for libvpx tools.
set -e

# Sets $VPX_TOOL_TEST to the name specified by positional parameter one.
test_begin() {
  VPX_TOOL_TEST="${1}"
}

# Clears the VPX_TOOL_TEST variable after confirming that $VPX_TOOL_TEST matches
# positional parameter one.
test_end() {
  if [ "$1" != "${VPX_TOOL_TEST}" ]; then
    echo "FAIL completed test mismatch!."
    echo "  completed test: ${1}"
    echo "  active test: ${VPX_TOOL_TEST}."
    return 1
  fi
  VPX_TOOL_TEST='<unset>'
}

# Echoes the target configuration being tested.
test_configuration_target() {
  vpx_config_mk="${LIBVPX_CONFIG_PATH}/config.mk"
  # Find the TOOLCHAIN line, split it using ':=' as the field separator, and
  # print the last field to get the value. Then pipe the value to tr to consume
  # any leading/trailing spaces while allowing tr to echo the output to stdout.
  awk -F ':=' '/TOOLCHAIN/ { print $NF }' "${vpx_config_mk}" | tr -d ' '
}

# Trap function used for failure reports and tool output directory removal.
# When the contents of $VPX_TOOL_TEST do not match the string '<unset>', reports
# failure of test stored in $VPX_TOOL_TEST.
cleanup() {
  if [ -n "${VPX_TOOL_TEST}" ] && [ "${VPX_TOOL_TEST}" != '<unset>' ]; then
    echo "FAIL: $VPX_TOOL_TEST"
  fi
  if [ -n "${VPX_TEST_OUTPUT_DIR}" ] && [ -d "${VPX_TEST_OUTPUT_DIR}" ]; then
    rm -rf "${VPX_TEST_OUTPUT_DIR}"
  fi
}

# Echoes the git hash portion of the VERSION_STRING variable defined in
# $LIBVPX_CONFIG_PATH/config.mk to stdout, or the version number string when
# no git hash is contained in VERSION_STRING.
config_hash() {
  vpx_config_mk="${LIBVPX_CONFIG_PATH}/config.mk"
  # Find VERSION_STRING line, split it with "-g" and print the last field to
  # output the git hash to stdout.
  vpx_version=$(awk -F -g '/VERSION_STRING/ {print $NF}' "${vpx_config_mk}")
  # Handle two situations here:
  # 1. The default case: $vpx_version is a git hash, so echo it unchanged.
  # 2. When being run a non-dev tree, the -g portion is not present in the
  #    version string: It's only the version number.
  #    In this case $vpx_version is something like 'VERSION_STRING=v1.3.0', so
  #    we echo only what is after the '='.
  echo "${vpx_version##*=}"
}

# Echoes the short form of the current git hash.
current_hash() {
  if git --version > /dev/null 2>&1; then
    (cd "$(dirname "${0}")"
    git rev-parse --short HEAD)
  else
    # Return the config hash if git is unavailable: Fail silently, git hashes
    # are used only for warnings.
    config_hash
  fi
}

# Echoes warnings to stdout when git hash in vpx_config.h does not match the
# current git hash.
check_git_hashes() {
  hash_at_configure_time=$(config_hash)
  hash_now=$(current_hash)

  if [ "${hash_at_configure_time}" != "${hash_now}" ]; then
    echo "Warning: git hash has changed since last configure."
  fi
}

# This script requires that the LIBVPX_BIN_PATH, LIBVPX_CONFIG_PATH, and
# LIBVPX_TEST_DATA_PATH variables are in the environment: Confirm that
# the variables are set and that they all evaluate to directory paths.
verify_vpx_test_environment() {
  if [ ! -d "${LIBVPX_BIN_PATH}" ]; then
    echo "The LIBVPX_BIN_PATH environment variable must be set."
    return 1
  fi
  if [ ! -d "${LIBVPX_CONFIG_PATH}" ]; then
    echo "The LIBVPX_CONFIG_PATH environment variable must be set."
    return 1
  fi
  if [ ! -d "${LIBVPX_TEST_DATA_PATH}" ]; then
    echo "The LIBVPX_TEST_DATA_PATH environment variable must be set."
    return 1
  fi
}

# Greps vpx_config.h in LIBVPX_CONFIG_PATH for positional parameter one, which
# should be a LIBVPX preprocessor flag. Echoes yes to stdout when the feature
# is available.
vpx_config_option_enabled() {
  vpx_config_option="${1}"
  vpx_config_file="${LIBVPX_CONFIG_PATH}/vpx_config.h"
  config_line=$(grep "${vpx_config_option}" "${vpx_config_file}")
  if echo "${config_line}" | egrep -q '1$'; then
    echo yes
  fi
}

# Echoes yes when output of test_configuration_target() contains win32 or win64.
is_windows_target() {
  if test_configuration_target \
     | grep -q -e win32 -e win64 > /dev/null 2>&1; then
    echo yes
  fi
}

# Echoes yes to stdout when the file named by positional parameter one exists
# in LIBVPX_BIN_PATH, and is executable.
vpx_tool_available() {
  tool_name="${1}"
  if [ "$(is_windows_target)" = "yes" ]; then
    tool_name="${tool_name}.exe"
  fi
  [ -x "${LIBVPX_BIN_PATH}/${1}" ] && echo yes
}

# Echoes yes to stdout when vpx_config_option_enabled() reports yes for
# CONFIG_VP8_DECODER.
vp8_decode_available() {
  [ "$(vpx_config_option_enabled CONFIG_VP8_DECODER)" = "yes" ] && echo yes
}

# Echoes yes to stdout when vpx_config_option_enabled() reports yes for
# CONFIG_VP8_ENCODER.
vp8_encode_available() {
  [ "$(vpx_config_option_enabled CONFIG_VP8_ENCODER)" = "yes" ] && echo yes
}

# Echoes yes to stdout when vpx_config_option_enabled() reports yes for
# CONFIG_VP9_DECODER.
vp9_decode_available() {
  [ "$(vpx_config_option_enabled CONFIG_VP9_DECODER)" = "yes" ] && echo yes
}

# Echoes yes to stdout when vpx_config_option_enabled() reports yes for
# CONFIG_VP9_ENCODER.
vp9_encode_available() {
  [ "$(vpx_config_option_enabled CONFIG_VP9_ENCODER)" = "yes" ] && echo yes
}

# Echoes yes to stdout when vpx_config_option_enabled() reports yes for
# CONFIG_WEBM_IO.
webm_io_available() {
  [ "$(vpx_config_option_enabled CONFIG_WEBM_IO)" = "yes" ] && echo yes
}

# Echoes yes to stdout when vpxdec exists according to vpx_tool_available().
vpxdec_available() {
  [ -n $(vpx_tool_available vpxdec) ] && echo yes
}

# Wrapper function for running vpxdec in noblit mode. Requires that
# LIBVPX_BIN_PATH points to the directory containing vpxdec. Positional
# parameter one is used as the input file path. Positional parameter two, when
# present, is interpreted as a boolean flag that means the input should be sent
# to vpxdec via pipe from cat instead of directly.
vpxdec() {
  input="${1}"
  pipe_input=${2}

  if [ $# -gt 2 ]; then
    # shift away $1 and $2 so the remaining arguments can be passed to vpxdec
    # via $@.
    shift 2
  fi

  decoder="${LIBVPX_BIN_PATH}/vpxdec"

  if [ "$(is_windows_target)" = "yes" ]; then
    decoder="${decoder}.exe"
  fi

  if [ -z "${pipe_input}" ]; then
    "${decoder}" "$input" --summary --noblit "$@" > /dev/null 2>&1
  else
    cat "${input}" | "${decoder}" - --summary --noblit "$@" > /dev/null 2>&1
  fi
}

# Echoes yes to stdout when vpxenc exists according to vpx_tool_available().
vpxenc_available() {
  [ -n $(vpx_tool_available vpxenc) ] && echo yes
}

# Wrapper function for running vpxenc. Positional parameters are interpreted as
# follows:
#   1 - codec name
#   2 - input width
#   3 - input height
#   4 - number of frames to encode
#   5 - path to input file
#   6 - path to output file
#       Note: The output file path must end in .ivf to output an IVF file.
#   7 - extra flags
#       Note: Extra flags currently supports a special case: when set to "-"
#             input is piped to vpxenc via cat.
vpxenc() {
  encoder="${LIBVPX_BIN_PATH}/vpxenc"
  codec="${1}"
  width=${2}
  height=${3}
  frames=${4}
  input=${5}
  output="${VPX_TEST_OUTPUT_DIR}/${6}"
  extra_flags=${7}

  if [ "$(is_windows_target)" = "yes" ]; then
    encoder="${encoder}.exe"
  fi

  # Because --ivf must be within the command line to get IVF from vpxenc.
  if echo "${output}" | egrep -q 'ivf$'; then
    use_ivf=--ivf
  else
    unset use_ivf
  fi

  if [ "${extra_flags}" = "-" ]; then
    pipe_input=yes
    extra_flags=${8}
  else
    unset pipe_input
  fi

  if [ -z "${pipe_input}" ]; then
    "${encoder}" --codec=${codec} --width=${width} --height=${height} \
        --limit=${frames} ${use_ivf} ${extra_flags} --output="${output}" \
        "${input}" > /dev/null 2>&1
  else
    cat "${input}" \
        | "${encoder}" --codec=${codec} --width=${width} --height=${height} \
            --limit=${frames} ${use_ivf} ${extra_flags} --output="${output}" - \
            > /dev/null 2>&1
  fi

  if [ ! -e "${output}" ]; then
    # Return non-zero exit status: output file doesn't exist, so something
    # definitely went wrong.
    return 1
  fi
}

# Filters strings from positional parameter one using the filter specified by
# positional parameter two. Filter behavior depends on the presence of a third
# positional parameter. When parameter three is present, strings that match the
# filter are excluded. When omitted, strings matching the filter are included.
# The filtered string is echoed to stdout.
filter_strings() {
  strings=${1}
  filter=${2}
  exclude=${3}

  if [ -n "${exclude}" ]; then
    # When positional parameter three exists the caller wants to remove strings.
    # Tell grep to invert matches using the -v argument.
    exclude='-v'
  else
    unset exclude
  fi

  if [ -n "${filter}" ]; then
    for s in ${strings}; do
      if echo "${s}" | egrep -q ${exclude} "${filter}" > /dev/null 2>&1; then
        filtered_strings="${filtered_strings} ${s}"
      fi
    done
  else
    filtered_strings="${strings}"
  fi
  echo "${filtered_strings}"
}

# Runs user test functions passed via positional parameters one and two.
# Functions in positional parameter one are treated as environment verification
# functions and are run unconditionally. Functions in positional parameter two
# are run according to the rules specified in vpx_test_usage().
run_tests() {
  env_tests="verify_vpx_test_environment ${1}"
  tests_to_filter="${2}"

  if [ "${VPX_TEST_RUN_DISABLED_TESTS}" != "yes" ]; then
    # Filter out DISABLED tests.
    tests_to_filter=$(filter_strings "${tests_to_filter}" ^DISABLED exclude)
  fi

  if [ -n "${VPX_TEST_FILTER}" ]; then
    # Remove tests not matching the user's filter.
    tests_to_filter=$(filter_strings "${tests_to_filter}" ${VPX_TEST_FILTER})
  fi

  tests_to_run="${env_tests} ${tests_to_filter}"

  check_git_hashes

  # Run tests.
  for test in ${tests_to_run}; do
    test_begin "${test}"
    "${test}"
    [ "${VPX_TEST_VERBOSE_OUTPUT}" = "yes" ] && echo "  PASS ${test}"
    test_end "${test}"
  done

  tested_config="$(test_configuration_target) @ $(current_hash)"
  echo $(basename "${0%.*}"): Done, all tests pass for ${tested_config}.
}

vpx_test_usage() {
cat << EOF
  Usage: ${0##*/} [arguments]
    --bin-path <path to libvpx binaries directory>
    --config-path <path to libvpx config directory>
    --filter <filter>: User test filter. Only tests matching filter are run.
    --run-disabled-tests: Run disabled tests.
    --help: Display this message and exit.
    --test-data-path <path to libvpx test data directory>
    --verbose: Verbose output.

    When the --bin-path option is not specified the script attempts to use
    \$LIBVPX_BIN_PATH and then the current directory.

    When the --config-path option is not specified the script attempts to use
    \$LIBVPX_CONFIG_PATH and then the current directory.

    When the -test-data-path option is not specified the script attempts to use
    \$LIBVPX_TEST_DATA_PATH and then the current directory.
EOF
}

# Returns non-zero (failure) when required environment variables are empty
# strings.
vpx_test_check_environment() {
  if [ -z "${LIBVPX_BIN_PATH}" ] || \
     [ -z "${LIBVPX_CONFIG_PATH}" ] || \
     [ -z "${LIBVPX_TEST_DATA_PATH}" ]; then
    return 1
  fi
}

# Parse the command line.
while [ -n "$1" ]; do
  case "$1" in
    --bin-path)
      LIBVPX_BIN_PATH="$2"
      shift
      ;;
    --config-path)
      LIBVPX_CONFIG_PATH="$2"
      shift
      ;;
    --filter)
      VPX_TEST_FILTER="$2"
      shift
      ;;
    --run-disabled-tests)
      VPX_TEST_RUN_DISABLED_TESTS=yes
      ;;
    --help)
      vpx_test_usage
      exit
      ;;
    --test-data-path)
      LIBVPX_TEST_DATA_PATH="$2"
      shift
      ;;
    --verbose)
      VPX_TEST_VERBOSE_OUTPUT=yes
      ;;
    *)
      vpx_test_usage
      exit 1
      ;;
  esac
  shift
done

# Handle running the tests from a build directory without arguments when running
# the tests on *nix/macosx.
LIBVPX_BIN_PATH="${LIBVPX_BIN_PATH:-.}"
LIBVPX_CONFIG_PATH="${LIBVPX_CONFIG_PATH:-.}"
LIBVPX_TEST_DATA_PATH="${LIBVPX_TEST_DATA_PATH:-.}"

# Create a temporary directory for output files, and a trap to clean it up.
if [ -n "${TMPDIR}" ]; then
  VPX_TEST_TEMP_ROOT="${TMPDIR}"
elif [ -n "${TEMPDIR}" ]; then
  VPX_TEST_TEMP_ROOT="${TEMPDIR}"
else
  VPX_TEST_TEMP_ROOT=/tmp
fi

VPX_TEST_RAND=$(awk 'BEGIN { srand(); printf "%d\n",(rand() * 32768)}')
VPX_TEST_OUTPUT_DIR="${VPX_TEST_TEMP_ROOT}/vpx_test_${VPX_TEST_RAND}"

if ! mkdir -p "${VPX_TEST_OUTPUT_DIR}" || \
   [ ! -d "${VPX_TEST_OUTPUT_DIR}" ]; then
  echo "${0##*/}: Cannot create output directory, giving up."
  echo "${0##*/}:   VPX_TEST_OUTPUT_DIR=${VPX_TEST_OUTPUT_DIR}"
  exit 1
fi

trap cleanup EXIT

if [ "${VPX_TEST_VERBOSE_OUTPUT}" = "yes" ]; then
cat << EOF
$(basename "${0%.*}") test configuration:
  LIBVPX_BIN_PATH=${LIBVPX_BIN_PATH}
  LIBVPX_CONFIG_PATH=${LIBVPX_CONFIG_PATH}
  LIBVPX_TEST_DATA_PATH=${LIBVPX_TEST_DATA_PATH}
  VPX_TEST_OUTPUT_DIR=${VPX_TEST_OUTPUT_DIR}
  VPX_TEST_VERBOSE_OUTPUT=${VPX_TEST_VERBOSE_OUTPUT}
  VPX_TEST_FILTER=${VPX_TEST_FILTER}
  VPX_TEST_RUN_DISABLED_TESTS=${VPX_TEST_RUN_DISABLED_TESTS}
EOF
fi