if("${ARCH}" STREQUAL "x86")
  set_ifndef(QEMU_binary_suffix i386)
else()
  set_ifndef(QEMU_binary_suffix ${ARCH})
endif()

set(qemu_alternate_path $ENV{QEMU_BIN_PATH})
if(qemu_alternate_path)
find_program(
  QEMU
  PATHS ${qemu_alternate_path}
  NO_DEFAULT_PATH
  NAMES qemu-system-${QEMU_binary_suffix}
  )
else()
find_program(
  QEMU
  qemu-system-${QEMU_binary_suffix}
  )
endif()

set(qemu_targets
  run
  debugserver
  )

set(QEMU_FLAGS -pidfile)
if(${CMAKE_GENERATOR} STREQUAL "Unix Makefiles")
  list(APPEND QEMU_FLAGS qemu\${QEMU_INSTANCE}.pid)
else()
  list(APPEND QEMU_FLAGS qemu${QEMU_INSTANCE}.pid)
endif()

# We can set "default" value for QEMU_PTY & QEMU_PIPE on cmake invocation.
if(QEMU_PTY)
  # Send console output to a pseudo-tty, used for running automated tests
  set(CMAKE_QEMU_SERIAL0 pty)
else()
  if(QEMU_PIPE)
    # Send console output to a pipe, used for running automated tests
    set(CMAKE_QEMU_SERIAL0 pipe:${QEMU_PIPE})
  else()
    set(CMAKE_QEMU_SERIAL0 mon:stdio)
  endif()
endif()

# But also can set QEMU_PTY & QEMU_PIPE on *make* (not cmake) invocation,
# like it was before cmake.
if(${CMAKE_GENERATOR} STREQUAL "Unix Makefiles")
  list(APPEND QEMU_FLAGS
    -serial
    \${if \${QEMU_PTY}, pty, \${if \${QEMU_PIPE}, pipe:\${QEMU_PIPE}, ${CMAKE_QEMU_SERIAL0}}}
    # NB: \$ is not supported by Ninja
    )
else()
  list(APPEND QEMU_FLAGS
    -serial
    ${CMAKE_QEMU_SERIAL0}
    )
endif()

# Add a BT serial device when building for bluetooth, unless the
# application explicitly opts out with NO_QEMU_SERIAL_BT_SERVER.
if(CONFIG_BT)
  if(NOT NO_QEMU_SERIAL_BT_SERVER)
    list(APPEND QEMU_FLAGS -serial unix:/tmp/bt-server-bredr)
  endif()
endif()

# If we are running a networking application in QEMU, then set proper
# QEMU variables. This also allows two QEMUs to be hooked together and
# pass data between them. The QEMU flags are not set for standalone
# tests defined by CONFIG_NET_TEST.
if(CONFIG_NETWORKING)
  if(CONFIG_NET_QEMU_SLIP)
    if((CONFIG_NET_SLIP_TAP) OR (CONFIG_IEEE802154_UPIPE))
      set(QEMU_NET_STACK 1)
    endif()
  endif()
endif()

# TO create independent pipes for each QEMU application set QEMU_PIPE_STACK
if(QEMU_PIPE_STACK)
  list(APPEND qemu_targets
    node
    )

  if(NOT QEMU_PIPE_ID)
    set(QEMU_PIPE_ID 1)
  endif()

  list(APPEND QEMU_FLAGS
    -serial none
    )

  list(APPEND MORE_FLAGS_FOR_node
        -serial pipe:/tmp/hub/ip-stack-node${QEMU_PIPE_ID}
        -pidfile qemu-node${QEMU_PIPE_ID}.pid
        )

  set(PIPE_NODE_IN  /tmp/hub/ip-stack-node${QEMU_PIPE_ID}.in)
  set(PIPE_NODE_OUT /tmp/hub/ip-stack-node${QEMU_PIPE_ID}.out)

  set(pipes
    ${PIPE_NODE_IN}
    ${PIPE_NODE_OUT}
    )

  set(destroy_pipe_commands
    COMMAND ${CMAKE_COMMAND} -E remove -f ${pipes}
    )

  set(create_pipe_commands
    COMMAND ${CMAKE_COMMAND} -E make_directory /tmp/hub
    COMMAND mkfifo ${PIPE_NODE_IN}
    COMMAND mkfifo ${PIPE_NODE_OUT}
    )

  set(PRE_QEMU_COMMANDS_FOR_node
    ${destroy_pipe_commands}
    ${create_pipe_commands}
    )

elseif(QEMU_NET_STACK)
  list(APPEND qemu_targets
    client
    server
    )

  foreach(target ${qemu_targets})
    if((${target} STREQUAL client) OR (${target} STREQUAL server))
      list(APPEND MORE_FLAGS_FOR_${target}
        -serial pipe:/tmp/ip-stack-${target}
        -pidfile qemu-${target}.pid
        )
    else()
      # QEMU_INSTANCE is a command line argument to *make* (not cmake). By
      # appending the instance name to the pid file we can easily run more
      # instances of the same sample.

      if(${CMAKE_GENERATOR} STREQUAL "Unix Makefiles")
        set(tmp_file unix:/tmp/slip.sock\${QEMU_INSTANCE})
      else()
        set(tmp_file unix:/tmp/slip.sock${QEMU_INSTANCE})
      endif()

      list(APPEND MORE_FLAGS_FOR_${target}
        -serial ${tmp_file}
        )
    endif()
  endforeach()


  set(PIPE_SERVER_IN  /tmp/ip-stack-server.in)
  set(PIPE_SERVER_OUT /tmp/ip-stack-server.out)
  set(PIPE_CLIENT_IN  /tmp/ip-stack-client.in)
  set(PIPE_CLIENT_OUT /tmp/ip-stack-client.out)

  set(pipes
    ${PIPE_SERVER_IN}
    ${PIPE_SERVER_OUT}
    ${PIPE_CLIENT_IN}
    ${PIPE_CLIENT_OUT}
    )

  set(destroy_pipe_commands
    COMMAND ${CMAKE_COMMAND} -E remove -f ${pipes}
    )

  # TODO: Port to Windows. Perhaps using python? Or removing the
  # need for mkfifo and create_symlink somehow.
  set(create_pipe_commands
    COMMAND mkfifo ${PIPE_SERVER_IN}
    COMMAND mkfifo ${PIPE_SERVER_OUT}
    )
  if(PCAP)
    list(APPEND create_pipe_commands
      COMMAND mkfifo ${PIPE_CLIENT_IN}
      COMMAND mkfifo ${PIPE_CLIENT_OUT}
      )
  else()
    list(APPEND create_pipe_commands
      COMMAND ${CMAKE_COMMAND} -E create_symlink ${PIPE_SERVER_IN}  ${PIPE_CLIENT_OUT}
      COMMAND ${CMAKE_COMMAND} -E create_symlink ${PIPE_SERVER_OUT} ${PIPE_CLIENT_IN}
      )
  endif()

  set(PRE_QEMU_COMMANDS_FOR_server
    ${destroy_pipe_commands}
    ${create_pipe_commands}
    )
  if(PCAP)
    # Start a monitor application to capture traffic
    #
    # Assumes;
    # PCAP has been set to the file where traffic should be captured
    # NET_TOOLS has been set to the net-tools repo path
    # net-tools/monitor_15_4 has been built beforehand

    set_ifndef(NET_TOOLS ${ZEPHYR_BASE}/../net-tools) # Default if not set

    list(APPEND PRE_QEMU_COMMANDS_FOR_server
      COMMAND ${NET_TOOLS}/monitor_15_4
  ${PCAP}
  /tmp/ip-stack-server
      /tmp/ip-stack-client
      > /dev/null &
      # TODO: Support cleanup of the monitor_15_4 process
      )
  endif()
endif(QEMU_PIPE_STACK)

if(CONFIG_X86_IAMCU)
  list(APPEND PRE_QEMU_COMMANDS
    COMMAND
    ${PYTHON_EXECUTABLE}
    ${ZEPHYR_BASE}/scripts/qemu-machine-hack.py
    $<TARGET_FILE:${logical_target_for_zephyr_elf}>
    )
endif()

if(CONFIG_X86_64)
  set(QEMU_KERNEL_FILE "${CMAKE_BINARY_DIR}/zephyr-qemu.elf")
endif()

if(NOT QEMU_PIPE)
  set(QEMU_PIPE_COMMENT "\nTo exit from QEMU enter: 'CTRL+a, x'\n")
endif()

# Use flags passed in from the environment
set(env_qemu $ENV{QEMU_EXTRA_FLAGS})
separate_arguments(env_qemu)
list(APPEND QEMU_EXTRA_FLAGS ${env_qemu})

list(APPEND MORE_FLAGS_FOR_debugserver -s -S)

# Architectures can define QEMU_KERNEL_FILE to use a specific output
# file to pass to qemu (and a "qemu_kernel_target" target to generate
# it), or set QEMU_KERNEL_OPTION if they want to replace the "-kernel
# ..." option entirely.
if(DEFINED QEMU_KERNEL_FILE)
  set(QEMU_KERNEL_OPTION "-kernel;${QEMU_KERNEL_FILE}")
elseif(NOT DEFINED QEMU_KERNEL_OPTION)
  set(QEMU_KERNEL_OPTION "-kernel;$<TARGET_FILE:${logical_target_for_zephyr_elf}>")
endif()

foreach(target ${qemu_targets})
  add_custom_target(${target}
    ${PRE_QEMU_COMMANDS}
    ${PRE_QEMU_COMMANDS_FOR_${target}}
    COMMAND
    ${QEMU}
    ${QEMU_FLAGS_${ARCH}}
    ${QEMU_FLAGS}
    ${QEMU_EXTRA_FLAGS}
    ${MORE_FLAGS_FOR_${target}}
    ${QEMU_KERNEL_OPTION}
    DEPENDS ${logical_target_for_zephyr_elf}
    WORKING_DIRECTORY ${APPLICATION_BINARY_DIR}
    COMMENT "${QEMU_PIPE_COMMENT}[QEMU] CPU: ${QEMU_CPU_TYPE_${ARCH}}"
    USES_TERMINAL
    )
  if(DEFINED QEMU_KERNEL_FILE)
    add_dependencies(${target} qemu_kernel_target)
  endif()
endforeach()