include(CMakeParseArguments)

# springbok_c_module()
#
# A wrapper for the iree_bytecode_module to apply common iree-translate flags
# Parameters:
# NAME: Name of target.
# SRC: Source file to compile into an emitC module. Support relative path.
# FLAGS: Flags to pass to the translation tool (list of strings).
# C_IDENTIFIER: Identifier to use for generate c embed code.
#     If omitted then no C embed code will be generated.
#
# Examples:
# springbok_c_module(
#   NAME
#     dare_devel_c_module_emitc_static
#   SRC
#     "daredevil_quant.tflite"
#   FLAGS
#     "-iree-input-type=tosa"
# )
#
# springbok_c_module(
#   NAME
#     simple_float_mul_c_module_emitc_static
#   SRC
#     "simple_float_mul.mlir"
#   FLAGS
#     "-iree-input-type=mhlo"
#   PUBLIC
# )
#
function(springbok_c_module)
  cmake_parse_arguments(
    _RULE
    "PUBLIC"
    "NAME;SRC"
    "FLAGS"
    ${ARGN}
  )

  set(_MLIR_SRC "${_RULE_SRC}")
  string(FIND "${_RULE_SRC}" ".tflite" _IS_TFLITE REVERSE)
  if(${_IS_TFLITE} GREATER 0)
    find_program(IREE_IMPORT_TFLITE_TOOL "iree-import-tflite" REQUIRED)
    set(_MLIR_SRC "${CMAKE_CURRENT_BINARY_DIR}/${_RULE_NAME}.mlir")
    get_filename_component(_SRC_PATH "${_RULE_SRC}" REALPATH)
    set(_ARGS "${_SRC_PATH}")
    list(APPEND _ARGS "-o")
    list(APPEND _ARGS "${_RULE_NAME}.mlir")
    # Only add the custom_command here. The output is passed to
    # iree_bytecode_module as the source.
    add_custom_command(
      OUTPUT
        "${_RULE_NAME}.mlir"
      COMMAND
        ${IREE_IMPORT_TFLITE_TOOL}
        ${_ARGS}
      DEPENDS
        ${IREE_IMPORT_TFLITE_TOOL}
    )
  endif()

  get_filename_component(_MLIR_SRC "${_MLIR_SRC}" REALPATH)
  iree_get_executable_path(_TRANSLATE_TOOL_EXECUTABLE "iree-translate")
  iree_get_executable_path(_LINKER_TOOL_EXECUTABLE "lld")

  # Replace dependencies passed by ::name with iree::package::name
  iree_package_ns(_PACKAGE_NS)
  list(TRANSFORM _RULE_DEPS REPLACE "^::" "${_PACKAGE_NS}::")

  # Prefix the library with the package name, so we get: iree_package_name.
  iree_package_name(_PACKAGE_NAME)

  set(_RULE_C_NAME "${_RULE_NAME}_c")
  set(_LIB_NAME "${_PACKAGE_NAME}_${_RULE_C_NAME}")
  set(_GEN_TARGET "${_LIB_NAME}_gen")
  set(_O_FILE_NAME ${_RULE_C_NAME}.o)
  set(_H_FILE_NAME ${_RULE_C_NAME}.h)
  set(_EMITC_FILE_NAME ${_RULE_NAME}_emitc.h)

  ## Example with VM C module.
  # Setup args for iree-translate.
  set(_TRANSLATE_ARGS ${_RULE_FLAGS})
  list(APPEND _TRANSLATE_ARGS "-iree-mlir-to-vm-c-module")
  list(APPEND _TRANSLATE_ARGS "-iree-hal-target-backends=dylib-llvm-aot")
  list(APPEND _TRANSLATE_ARGS "-iree-llvm-target-triple=riscv32-pc-linux-elf")
  list(APPEND _TRANSLATE_ARGS "-iree-llvm-target-cpu=generic-rv32")
  list(APPEND _TRANSLATE_ARGS "-iree-llvm-target-cpu-features=+m,+f,+experimental-v")
  list(APPEND _TRANSLATE_ARGS "-iree-llvm-target-abi=ilp32")
  list(APPEND _TRANSLATE_ARGS "-iree-llvm-link-embedded=false")
  list(APPEND _TRANSLATE_ARGS "-iree-llvm-link-static")
  list(APPEND _TRANSLATE_ARGS "-iree-llvm-system-linker-path=\"${_LINKER_TOOL_EXECUTABLE}\"")
  list(APPEND _TRANSLATE_ARGS "-iree-llvm-static-library-output-path=${_O_FILE_NAME}")
  list(APPEND _TRANSLATE_ARGS "${_MLIR_SRC}")
  list(APPEND _TRANSLATE_ARGS "-o")
  list(APPEND _TRANSLATE_ARGS "${_EMITC_FILE_NAME}")

  # Custom command for iree-translate to generate static library and C module.
  add_custom_command(
    OUTPUT
      ${_H_FILE_NAME}
      ${_O_FILE_NAME}
      ${_EMITC_FILE_NAME}
    COMMAND ${_TRANSLATE_TOOL_EXECUTABLE} ${_TRANSLATE_ARGS}
    DEPENDS ${_TRANSLATE_TOOL_EXECUTABLE} ${_MLIR_SRC} ${_LINKER_TOOL_EXECUTABLE}
  )

  add_custom_target(
    ${_GEN_TARGET}
    DEPENDS
      "${_EMITC_FILE_NAME}"
  )

   add_library(${_LIB_NAME}
   STATIC
   ${_O_FILE_NAME}
  )
  add_dependencies(${_LIB_NAME} ${_GEN_TARGET})

  SET_TARGET_PROPERTIES(
    ${_LIB_NAME}
    PROPERTIES
    LINKER_LANGUAGE C
  )

  # Alias the iree_package_name library to iree::package::name.
  # This lets us more clearly map to Bazel and makes it possible to
  # disambiguate the underscores in paths vs. the separators.
  add_library(${_PACKAGE_NS}::${_RULE_C_NAME} ALIAS ${_LIB_NAME})
  iree_package_dir(_PACKAGE_DIR)
  if(${_RULE_C_NAME} STREQUAL ${_PACKAGE_DIR})
    add_library(${_PACKAGE_NS} ALIAS ${_LIB_NAME})
  endif()

endfunction()