#!/bin/bash
# Copyright 2020 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
#
# Common helpers specific for Fuchsia in-tree testing.

btf::setup_fx() {
  if [[ -z "${BT_TEMP_DIR}" ]]; then
    echo "Cannot proceed, BT_TEMP_DIR is unset" 1>&2
    exit 1
  fi
  local with_metrics=0
  if [[ $# -gt 0 && "$1" == "1" ]]; then
    with_metrics=1
  fi

  local _HOST_OUT_DIR="host_x64"
  local _REL_BUILD_DIR="out/default"
  local _FUCHSIA_DIR="${BT_TEMP_DIR}"
  local _FUCHSIA_BUILD_DIR="${_FUCHSIA_DIR}/${_REL_BUILD_DIR}"

  # Fake fuchsia dir configuration.
  local _FX="${_FUCHSIA_DIR}/scripts/fx"
  BT_ASSERT_FILE_EXISTS "${_FX}"
  BT_ASSERT_FILE_EXISTS "${_FUCHSIA_DIR}/tools/devshell/lib/vars.sh"
  BT_ASSERT_FILE_EXISTS "${_FUCHSIA_DIR}/tools/devshell/lib/platform.sh"
  BT_ASSERT_FILE_EXISTS "${_FUCHSIA_DIR}/tools/devshell/lib/fx-optional-features.sh"

  # Fake a build directory with the minimal content so that fx work
  mkdir -p "${_FUCHSIA_BUILD_DIR}" "${_FUCHSIA_BUILD_DIR}/${_HOST_OUT_DIR}" \
           "${_FUCHSIA_DIR}/.jiri_root/bin" "${_FUCHSIA_DIR}/.ssh"
  ln -s "${_FX}" "${_FUCHSIA_DIR}/.jiri_root/bin/fx"
  echo "${_REL_BUILD_DIR}" > "${_FUCHSIA_DIR}/.fx-build-dir"
  touch "${_FUCHSIA_BUILD_DIR}/args.gn"
  touch "${_FUCHSIA_DIR}/.ssh/fuchsia_ed25519" "${_FUCHSIA_DIR}/.ssh/fuchsia_authorized_keys"
  echo -e "${_FUCHSIA_DIR}/.ssh/fuchsia_ed25519\n${_FUCHSIA_DIR}/.ssh/fuchsia_authorized_keys" > "${_FUCHSIA_DIR}/.fx-ssh-path"

  cat > "${_FUCHSIA_BUILD_DIR}/fx.config" << EOF
# Generated by fuchsia-mock.sh.
FUCHSIA_BUILD_DIR='${_REL_BUILD_DIR}'
FUCHSIA_ARCH='x64'
FUCHSIA_BOARD_NAME=pc
FUCHSIA_ZBI_COMPRESSION=zstd
HOST_OUT_DIR='${_HOST_OUT_DIR}'
EOF
  if (( with_metrics )); then
    BT_ASSERT_FILE_EXISTS "${_FUCHSIA_DIR}/tools/devshell/lib/metrics.sh"
  else
    btf::make_mock "${_FUCHSIA_DIR}/tools/devshell/lib/metrics.sh"
    cat > "${_FUCHSIA_DIR}/tools/devshell/lib/metrics.sh.mock_side_effects" <<EOF
  function track-command-execution {
   :
  }
  function track-command-finished {
   :
  }
EOF
  fi
  # If the host-tool command is not mocked, some code in vars.sh will
  # not work well. If a custom mock of 'fx host-tool' is needed, mock it
  # before calling 'setup_fx'
  btf::_make_fx_host_tool_mock

  echo "${_FX}"
}

btf::setup_fx_with_metrics() {
  btf::setup_fx 1
}

btf::_make_buildtool_mock() {
  local rel_path="$1"
  local path="${BT_TEMP_DIR}/${rel_path}"
  btf::make_mock "${path}"

  echo "${path}" >> "${BT_TEMP_DIR}/.mocked_tools"
  echo "${path}"
}

btf::make_installed_hosttools_mock() {
  local hosttool_name="$1"
  btf::_make_buildtool_mock "out/default/host-tools/${hosttool_name}"
}

btf::make_hosttools_mock() {
  local hosttool_name="$1"
  btf::_make_buildtool_mock "out/default/host_x64/${hosttool_name}"
}

btf::make_mock_binary() {
  local -r _BIN_PATH="$(mktemp -d "${BT_TEMP_DIR}/binpath.XXXXXX")"
  local tool_name="$1"
  local tool_path="${_BIN_PATH}/${tool_name}"
  btf::make_mock "${tool_path}"
  echo "${tool_path}"
}

btf::add_binary_to_path() {
  local tool_path="$(dirname "$1")"
  export PATH="${tool_path}:$PATH"
}

btf::_make_fx_host_tool_mock() {
  local tool="${BT_TEMP_DIR}/tools/devshell/host-tool"
  if [[ -f "${tool}" ]]; then
    return 0
  fi

  btf::make_mock "${tool}"
  cat > "${tool}.mock_side_effects" <<EOF
    # remove host-tool args (like --check-firewall)
    print=false
    while [[ \$# -gt 0 && \$1 =~ ^- ]]; do
      if [[ \$1 == "--print" ]]; then
        print=true
      fi
      shift
    done
    if [[ \$# == 0 ]]; then
      echo >&2 "Invalid state, cannot find host tool name"
      return 1
    fi
    tool="\$1"
    p="\$(grep "/\${tool}$" "${BT_TEMP_DIR}/.mocked_tools")"
    if [[ -z "\$p" ]]; then
      echo >&2 "Invalid state, cannot find path for \$tool." \
      "Use a btf::make_*_mock() method from fuchsia-mock.sh to mock it."
      return 1
    fi
    if [[ ! -x "\$p" ]]; then
      echo >&2 "Invalid state, \$p is not executable."
      return 1
    fi
    if \$print; then
      echo "\$p"
    else
      "\$p" "\$@"
    fi
EOF
}

# Verifies that the arguments in BT_MOCK_ARGS match the arguments to this function.
# The number and order of arguments must match, or non-zero is returned.
# If a value of an argument is un-important it can be marked with the string
# _ANY_. This allows for matching arguments that may have unique values, such as temp
# filenames.
# Args: toolname|mock_state_file arg [arg] [arg] ...
# Returns: 0 if found; 1 if not found.
btf::expect-mock-args() {
  local tool="$1"
  if [[ ! "${tool}" =~ \.mock_state(\.[0-9]+)?$ ]]; then
    tool="${tool}.mock_state"
  fi
  BT_ASSERT_FILE_EXISTS "${tool}"
  shift
  source "${tool}"
  local expected=("$@")
  local actual=("${BT_MOCK_ARGS[@]:1}")  # ignore the first arg, the mocked command
  if [[ ${#actual[@]} -ne ${#expected[@]} ]]; then
    btf::_fail 1 "Unexpected number of arguments to ${tool}.\n  Expected ${#expected[@]}: ${expected[*]}\n  Actual ${#actual[@]}: ${actual[*]}"
    return
  fi
  for (( i=0; i<"${#expected[@]}"; i++ )); do
    if [[ "${expected[$i]}" != "_ANY_" ]];  then
      if [[ "${actual[$i]}" != "${expected[$i]}" ]]; then
        btf::_fail 1 "Unexpected arguments to ${tool}.\n  Expected: ${expected[*]}\n  Actual: ${actual[*]}"
        return
      fi
    fi
  done
  return 0
}

btf::does-mock-args-contain() {
  local state_file="$1"
  BT_ASSERT_FILE_EXISTS "${state_file}"
  shift
  source "${state_file}"
  local expected=("$@")
  local actual=("${BT_MOCK_ARGS[@]}")
  local al=${#actual[@]}
  local el=${#expected[@]}
  if [[ $el -gt $al ]]; then
    return 1
  fi
  for (( a=1; a<"$(( al - el + 1 ))"; a++ )); do
    for (( e=0; e<"${el}"; e++ )); do
      local shifted="$((a + e))"
      if [[ "${expected[$e]}" != "_ANY_" && "${actual[$shifted]}" != "${expected[$e]}" ]]; then
        continue 2   # continue the outer loop
      fi
    done
    # if we got here, we went through all the expected arguments, so success
    return 0
  done
  return 1
}

btf::does-mock-args-not-contain() {
  local state_file="$1"
  BT_ASSERT_FILE_EXISTS "${state_file}"
  shift
  source "${state_file}"
  local expected=("$@")
  local actual=("${BT_MOCK_ARGS[@]}")
  local al=${#actual[@]}
  local el=${#expected[@]}
  if [[ $el -gt $al ]]; then
    return 0
  fi
  for (( a=1; a<"$(( al - el + 1 ))"; a++ )); do
    for (( e=0; e<"${el}"; e++ )); do
      local shifted="$((a + e))"
      if [[ "${expected[$e]}" != "_ANY_" && "${actual[$shifted]}" != "${expected[$e]}" ]]; then
        continue 2   # continue the outer loop
      fi
    done
    # if we got here, we went through all the expected arguments, so we found it
    return 1
  done
}