#!/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.

### Test fx emu

BT_FILE_DEPS=(
  "scripts/fx"
  "tools/devshell/emu"
  "tools/devshell/get-build-dir"
  "tools/devshell/lib/fvm.sh"
  "tools/devshell/lib/fx-cmd-locator.sh"
  "tools/devshell/lib/fx-optional-features.sh"
  "tools/devshell/lib/image_build_vars.sh"
  "tools/devshell/lib/platform.sh"
  "tools/devshell/lib/vars.sh"
)

BT_MOCKED_TOOLS=(
  "tools/devshell/build"
)

declare fx

BT_SET_UP() {
  source "${BT_TEMP_DIR}/tools/devshell/lib/vars.sh"
  source "${BT_TEMP_DIR}/tools/devshell/tests/lib/fuchsia-mock.sh"
  fx="$(btf::setup_fx)"
  btf::make_mock "${PREBUILT_AEMU_DIR}/emulator"
  btf::make_mock "${BT_TEMP_DIR}/out/default/image_paths.sh"

  btf::make_mock "${BT_TEMP_DIR}/tools/devshell/list-build-artifacts"
  btf::make_hosttools_mock zbi > /dev/null
  fvm="$(btf::make_hosttools_mock fvm)"
}

# Test that -c arguments are added to the end of the kernel command line.
TEST_kernel_cmdline_append() {
  BT_EXPECT ${fx} emu --no-build --headless -a off --experiment-arm64 -c foobar
  source "${PREBUILT_AEMU_DIR}/emulator.mock_state"

  # The last arg will contain the kernel command line string.
  local cmdline_string="${BT_MOCK_ARGS[${#BT_MOCK_ARGS[@]}-1]}"

  # Convert the string to an array so we can easily examine the last element.
  local cmdline_array=($cmdline_string)
  BT_EXPECT_EQ "${cmdline_array[${#cmdline_array[@]}-1]}" "foobar"
}

# Test that -A argument works.
TEST_arch_arm64() {
  BT_EXPECT ${fx} emu --no-build --headless -a off --experiment-arm64 -A arm64
  source "${PREBUILT_AEMU_DIR}/emulator.mock_state"

  local machine_arg="$(get_machine_arg)"
  BT_EXPECT_EQ "${machine_arg}" "virt"
}

# Test that -A argument works.
TEST_arch_x64() {
  BT_EXPECT ${fx} emu --no-build --headless -a off -A x64
  source "${PREBUILT_AEMU_DIR}/emulator.mock_state"

  local machine_arg="$(get_machine_arg)"
  BT_EXPECT_EQ "${machine_arg}" "q35"
}

get_machine_arg() {
  for i in "${!BT_MOCK_ARGS[@]}"; do
    if [[ "${BT_MOCK_ARGS[$i]}" == "-machine" ]]; then
      echo ${BT_MOCK_ARGS[(($i + 1))]}
      return
    fi
  done
  echo "invalid"
}

# Test creating a raw FVM image on-demand.
TEST_create_fvm() {
  # Fake that we have a sparse FVM image to use as a source.
  touch "${BT_TEMP_DIR}/out/default/fvm.blk"
  touch "${BT_TEMP_DIR}/out/default/fvm.blk.decompressed"

  cat > "${BT_TEMP_DIR}/tools/devshell/list-build-artifacts.mock_side_effects" << "EOF"
if [[ "$@" == "--name zbi --expect-one tools" ]] ; then
  echo "host/zbi"
elif [[ "$@" == "--name fvm --expect-one tools" ]] ; then
  echo "host/fvm"
elif [[ "$@" == "--name storage-sparse --allow-empty images" ]] ; then
  echo "fvm.blk"
fi
EOF

  # We need to mock out 2 `fvm` tool behaviors:
  #  1. "decompress" should create the requested file
  #  2. "extend" should save the file path so we can verify it's passed as
  #     an emulator arg later
  local created_fvm_path_file="${BT_TEMP_DIR}/out/default/created-fvm-path"
  cat > "${fvm}.mock_side_effects" << EOF
if [[ \$2 == "decompress" ]]; then
  touch \$1
elif [[ \$2 == "extend" ]]; then
  echo \$1 > "${created_fvm_path_file}"
fi
EOF

  BT_EXPECT ${fx} emu --no-build --headless -a off

  local created_fvm_path=$(cat "${created_fvm_path_file}")
  BT_EXPECT btf::does-mock-args-contain \
      "${PREBUILT_AEMU_DIR}/emulator.mock_state" \
      "-drive" "file=${created_fvm_path},format=raw,if=none,id=vdisk" \
      "-device" "virtio-blk-pci,drive=vdisk"
}

BT_RUN_TESTS "$@"