cmake_minimum_required(VERSION 3.9)

project(pi400kb)

# for asprintf
set(CMAKE_C_STANDARD 99)
set(CMAKE_C_STANDARD_REQUIRED ON)
set(CMAKE_C_EXTENSIONS ON)
add_compile_definitions(_GNU_SOURCE)

option(NO_OUTPUT "Disable USB HID output" OFF)

if(NOT HOOK_PATH)
    set(HOOK_PATH "/home/pi/pi400kb/hook.sh" CACHE STRING "Path to .sh toggle hook")
endif()

if(NOT KEYBOARD_VID)
    set(KEYBOARD_VID "0x04d9" CACHE STRING "Vendor ID for keyboard")
endif()

if(NOT KEYBOARD_PID)
    set(KEYBOARD_PID "0x0007" CACHE STRING "Product ID for keyboard")
endif()

if(NOT KEYBOARD_DEV)
    set(KEYBOARD_DEV "/dev/input/by-id/usb-_Raspberry_Pi_Internal_Keyboard-event-kbd" CACHE STRING "Device path for keyboard")
endif()


if(NOT MOUSE_VID)
    set(MOUSE_VID "0x093a" CACHE STRING "Vendor ID for mouse")
endif()

if(NOT MOUSE_PID)
    set(MOUSE_PID "0x2510" CACHE STRING "Product ID for mouse")
endif()

if(NOT MOUSE_DEV)
    set(MOUSE_DEV "/dev/input/by-id/usb-PixArt_USB_Optical_Mouse-event-mouse" CACHE STRING "Device path for mouse")
endif()


add_library(libusbgx INTERFACE)
target_sources(libusbgx INTERFACE
    ${CMAKE_CURRENT_LIST_DIR}/libusbgx/src/usbg.c
    ${CMAKE_CURRENT_LIST_DIR}/libusbgx/src/usbg_common.c
    ${CMAKE_CURRENT_LIST_DIR}/libusbgx/src/usbg_common_libconfig.c
    ${CMAKE_CURRENT_LIST_DIR}/libusbgx/src/usbg_schemes_libconfig.c
    ${CMAKE_CURRENT_LIST_DIR}/libusbgx/src/usbg_error.c

    ${CMAKE_CURRENT_LIST_DIR}/libusbgx/src/function/ether.c
    ${CMAKE_CURRENT_LIST_DIR}/libusbgx/src/function/ffs.c
    ${CMAKE_CURRENT_LIST_DIR}/libusbgx/src/function/hid.c
    ${CMAKE_CURRENT_LIST_DIR}/libusbgx/src/function/loopback.c
    ${CMAKE_CURRENT_LIST_DIR}/libusbgx/src/function/midi.c
    ${CMAKE_CURRENT_LIST_DIR}/libusbgx/src/function/ms.c
    ${CMAKE_CURRENT_LIST_DIR}/libusbgx/src/function/phonet.c
    ${CMAKE_CURRENT_LIST_DIR}/libusbgx/src/function/serial.c
    ${CMAKE_CURRENT_LIST_DIR}/libusbgx/src/function/uac2.c
)

# disable -Waddress-of-packed-member unaligned pointer warning
set_source_files_properties(
    ${CMAKE_CURRENT_LIST_DIR}/libusbgx/src/function/ether.c
    PROPERTIES COMPILE_FLAGS
    "-Wno-address-of-packed-member"
)

target_include_directories(libusbgx INTERFACE ${CMAKE_CURRENT_LIST_DIR}/libusbgx/include)
target_include_directories(libusbgx INTERFACE ${CMAKE_CURRENT_BINARY_DIR})

target_compile_definitions(libusbgx INTERFACE HAS_GADGET_SCHEMES)

if(EXISTS ${CMAKE_CURRENT_LIST_DIR}/libusbgx/include/usbg/usbg_version.h.in)
    set(USBG_VERSION_HEX "0x00000000")
    configure_file(${CMAKE_CURRENT_LIST_DIR}/libusbgx/include/usbg/usbg_version.h.in ${CMAKE_CURRENT_BINARY_DIR}/usbg_version.h @ONLY)
else()
    message(FATAL_ERROR "Missing usbg_version.h.in. Did you forget to `git submodule update --init`?")
endif()

find_library(libconfig libconfig)

target_link_libraries(libusbgx INTERFACE config)

add_executable(
    pi400kb
    pi400.c
    gadget-hid.c
)

target_compile_definitions(pi400kb PRIVATE
    HAS_GADGET_SCHEMES

    HOOK_PATH="${HOOK_PATH}"

    MOUSE_VID=${MOUSE_VID}
    MOUSE_PID=${MOUSE_PID}
    MOUSE_DEV="${MOUSE_DEV}"

    KEYBOARD_VID=${KEYBOARD_VID}
    KEYBOARD_PID=${KEYBOARD_PID}
    KEYBOARD_DEV="${KEYBOARD_DEV}"
)

if(NO_OUTPUT)
    target_compile_definitions(pi400kb PRIVATE NO_OUTPUT)
endif()

target_link_libraries(pi400kb libusbgx)

install(FILES
    ${CMAKE_CURRENT_LIST_DIR}/hook.sh
    ${CMAKE_CURRENT_LIST_DIR}/pi400kb.service
    ${CMAKE_CURRENT_LIST_DIR}/README.md
    DESTINATION .
)

install(TARGETS pi400kb DESTINATION .)

set(CPACK_INCLUDE_TOPLEVEL_DIRECTORY OFF)
set(CPACK_GENERATOR "ZIP" "TGZ")
include(CPack)