# csvtoenum(<CSV_FILE> <OUT_HEADER> <C_TYPE> <TAKE_COLUMN> <PREFIX_COLUMN>)
# Example:
# csvtoenum(myfile.csv outhead.h itemtype_t id ITEM_TYPE_)
#
# Will generate a header with:
# typedef enum {
#   ITEM_TYPE_NULL,
#   ITEM_TYPE_FOO,
#   ...
#   ITEM_TYPE_COUNT,
# } itemtype_t;

function(csvtoenum CSV_FILE OUT_HEADER C_TYPE TAKE_COLUMN PREFIX_COLUMN)
  # Read the CSV file
  file(READ "${CSV_FILE}" CSV_CONTENTS)
  string(REPLACE "\r\n" "\n" CSV_CONTENTS "${CSV_CONTENTS}")
  string(REPLACE "\r" "\n" CSV_CONTENTS "${CSV_CONTENTS}")
  string(REGEX REPLACE "\n+$" "" CSV_CONTENTS "${CSV_CONTENTS}")
  string(REPLACE "\n" ";" CSV_LINES "${CSV_CONTENTS}")

  # Get header row and find column indices
  list(GET CSV_LINES 0 HEADER_ROW)
  string(REPLACE "," ";" HEADER_LIST "${HEADER_ROW}")
  set(COLUMN_INDEX -1)
  set(PREFIX_INDEX -1)
  set(IDX 0)
  foreach(COL ${HEADER_LIST})
    if(COL STREQUAL "${TAKE_COLUMN}")
      set(COLUMN_INDEX ${IDX})
    endif()
    if(COL STREQUAL "${PREFIX_COLUMN}")
      set(PREFIX_INDEX ${IDX})
    endif()
    math(EXPR IDX "${IDX} + 1")
  endforeach()
  if(COLUMN_INDEX EQUAL -1)
    message(FATAL_ERROR "csvtoenum: TAKE_COLUMN '${TAKE_COLUMN}' not found in header of ${CSV_FILE}")
  endif()
  if(PREFIX_INDEX EQUAL -1)
    message(FATAL_ERROR "csvtoenum: PREFIX_COLUMN '${PREFIX_COLUMN}' not found in header of ${CSV_FILE}")
  endif()

  # Prepare enum entries
  set(ENUM_ENTRIES "  ${PREFIX_COLUMN}NULL,")
  set(ROW_IDX 1)
  list(LENGTH CSV_LINES NUM_LINES)
  while(ROW_IDX LESS NUM_LINES)
    list(GET CSV_LINES ${ROW_IDX} ROW)
    string(REPLACE "," ";" ROW_LIST "${ROW}")
    list(LENGTH ROW_LIST ROW_LEN)
    if(ROW_LEN GREATER COLUMN_INDEX)
      list(GET ROW_LIST ${COLUMN_INDEX} ENTRY)
      list(GET ROW_LIST ${PREFIX_INDEX} PREFIX)
      # Only add if ENTRY is not empty
      string(STRIP "${ENTRY}" ENTRY)
      if(NOT ENTRY STREQUAL "")
        set(ENUM_ENTRIES "${ENUM_ENTRIES}\n  ${PREFIX}${ENTRY},")
      endif()
    endif()
    math(EXPR ROW_IDX "${ROW_IDX} + 1")
  endwhile()
  set(ENUM_ENTRIES "${ENUM_ENTRIES}\n  ${PREFIX_COLUMN}COUNT,")

  # Write header file
  file(WRITE "${OUT_HEADER}" "/**\n * Auto-generated by csvtoenum.cmake\n * Source: ${CSV_FILE}\n */\n\ntypedef enum {\n${ENUM_ENTRIES}\n} ${C_TYPE};\n")
endfunction()