# Copyright (c) 2026 Dominic Masters
#
# This software is released under the MIT License.
# https://opensource.org/licenses/MIT

# Resolve YAUL_INSTALL_ROOT (already set by the toolchain file, but guard
# in case cmake/targets/ is loaded standalone for IDE tooling).
if(NOT DEFINED YAUL_INSTALL_ROOT)
  if(DEFINED ENV{YAUL_INSTALL_ROOT})
    set(YAUL_INSTALL_ROOT "$ENV{YAUL_INSTALL_ROOT}")
  else()
    set(YAUL_INSTALL_ROOT "/opt/yaul")
  endif()
endif()

# Yaul installs headers/libs under the arch-prefix sysroot subdirectory:
#   ${YAUL_INSTALL_ROOT}/sh2eb-elf/include/
#   ${YAUL_INSTALL_ROOT}/sh2eb-elf/lib/
# Cross-compiled zlib and libzip are installed to the same sysroot.
set(_YAUL_SYSROOT "${YAUL_INSTALL_ROOT}/sh2eb-elf")
set(_YAUL_BIN     "${YAUL_INSTALL_ROOT}/bin")

# ---------------------------------------------------------------------------
# Bypass system find_package calls for libraries we cross-compile into the
# sh2eb-elf sysroot and install into ${_YAUL_SYSROOT}.
# ---------------------------------------------------------------------------

# zlib
if(NOT TARGET ZLIB::ZLIB)
  add_library(ZLIB::ZLIB INTERFACE IMPORTED GLOBAL)
  set_target_properties(ZLIB::ZLIB PROPERTIES
    INTERFACE_INCLUDE_DIRECTORIES "${_YAUL_SYSROOT}/include"
    INTERFACE_LINK_LIBRARIES      "${_YAUL_SYSROOT}/lib/libz.a"
  )
endif()
set(ZLIB_FOUND         TRUE CACHE BOOL "" FORCE)
set(ZLIB_INCLUDE_DIR   "${_YAUL_SYSROOT}/include" CACHE PATH "" FORCE)
set(ZLIB_LIBRARY       "${_YAUL_SYSROOT}/lib/libz.a" CACHE FILEPATH "" FORCE)

# libzip — pre-installed into the sh2eb-elf sysroot; skip Findlibzip.cmake.
set(libzip_FOUND TRUE CACHE BOOL "libzip found (Saturn sysroot)" FORCE)
find_path(_sat_zip_inc NAMES zip.h
  PATHS "${_YAUL_SYSROOT}/include"
  NO_DEFAULT_PATH
)
if(_sat_zip_inc)
  target_include_directories(${DUSK_LIBRARY_TARGET_NAME} PRIVATE "${_sat_zip_inc}")
endif()

# ---------------------------------------------------------------------------
# Compile definitions
# ---------------------------------------------------------------------------
target_compile_definitions(${DUSK_LIBRARY_TARGET_NAME} PUBLIC
  DUSK_SATURN
  DUSK_INPUT_GAMEPAD
  DUSK_PLATFORM_ENDIAN_BIG
  DUSK_DISPLAY_WIDTH=320
  DUSK_DISPLAY_HEIGHT=224
  DUSK_THREAD_NONE
)

# ---------------------------------------------------------------------------
# Compile options
# ---------------------------------------------------------------------------
target_compile_options(${DUSK_LIBRARY_TARGET_NAME} PRIVATE
  -m2 -mb
  -fno-builtin
  -fomit-frame-pointer
  -w
)

# ---------------------------------------------------------------------------
# Include paths
# ---------------------------------------------------------------------------
target_include_directories(${DUSK_LIBRARY_TARGET_NAME} PRIVATE
  "${_YAUL_SYSROOT}/include"
  "${_YAUL_SYSROOT}/include/yaul"
)

# ---------------------------------------------------------------------------
# Link libraries
# ---------------------------------------------------------------------------
target_link_directories(${DUSK_LIBRARY_TARGET_NAME} PRIVATE
  "${_YAUL_SYSROOT}/lib"
)

target_link_libraries(${DUSK_LIBRARY_TARGET_NAME} PRIVATE
  "${_YAUL_SYSROOT}/lib/libyaul.a"
  "${_YAUL_SYSROOT}/lib/libzip.a"
  "${_YAUL_SYSROOT}/lib/libz.a"
  m
)

# ---------------------------------------------------------------------------
# Post-build: ELF → binary image
# sh2eb-elf-objcopy converts the ELF to a flat binary that IP.BIN loads
# into Saturn Work RAM.
# ---------------------------------------------------------------------------
set(DUSK_SAT_BIN "${CMAKE_BINARY_DIR}/Dusk.bin")
add_custom_command(TARGET ${DUSK_BINARY_TARGET_NAME} POST_BUILD
  COMMAND "${_YAUL_BIN}/sh2eb-elf-objcopy"
          -O binary
          "$<TARGET_FILE:${DUSK_BINARY_TARGET_NAME}>"
          "${DUSK_SAT_BIN}"
  COMMENT "Converting ${DUSK_BINARY_TARGET_NAME} ELF → ${DUSK_SAT_BIN}"
)