# Extract the retail assets into OUT using the ra3tools scripts. Driven by the
# openra3_assets target and run with `cmake -P`, so it needs only Python and the
# game install - no target executable, and therefore works for a cross-build too
# (mount the install into the container and pass RA3_GAME_DIR).
#
# Variables (all required unless noted):
#   GAME_DIR     Red Alert 3 install root
#   OUT          destination folder (next to the executable)
#   PYTHON       python interpreter
#   RA3TOOLS     path to ra3-headless/ra3tools
#   EXTRACT_ALL  ON to also dump every asset (models/textures/audio/movies)
#   STAMP        stamp file to write on completion

function(run)
    execute_process(COMMAND ${ARGN} RESULT_VARIABLE _rc)
    if(NOT _rc EQUAL 0)
        message(WARNING "extract step failed (${_rc}): ${ARGN}")
    endif()
endfunction()

file(MAKE_DIRECTORY "${OUT}")

if(NOT EXISTS "${RA3TOOLS}/ra3_big.py")
    message(WARNING "ra3tools not found at '${RA3TOOLS}'; skipping asset extraction")
else()
    # Maps + overview art: raw .big payloads; the engine unwraps EAR/RefPack.
    run("${PYTHON}" "${RA3TOOLS}/ra3_big.py" extract "${GAME_DIR}/Data/MapsMultiplayer.big" --match "*.map" --out "${OUT}/maps")
    run("${PYTHON}" "${RA3TOOLS}/ra3_big.py" extract "${GAME_DIR}/Data/MapsMultiplayer.big" --match "*_art.tga" --out "${OUT}/maps")

    # Terrain tile textures (the engine samples these for the map).
    foreach(archive Terrain.big Core11.big)
        if(EXISTS "${GAME_DIR}/Data/${archive}")
            run("${PYTHON}" "${RA3TOOLS}/ra3_big.py" extract "${GAME_DIR}/Data/${archive}" --match "*.tga" --out "${OUT}/terrain")
        endif()
    endforeach()

    if(EXTRACT_ALL)
        message(STATUS "extracting every .big entry to ${OUT}/raw")
        run("${PYTHON}" "${RA3TOOLS}/ra3_big.py" extract-all --game-dir "${GAME_DIR}" --out "${OUT}/raw" --match "*")

        if(EXISTS "${RA3TOOLS}/ra3_binary.py")
            message(STATUS "extracting models + textures (static stream)")
            run("${PYTHON}" "${RA3TOOLS}/ra3_binary.py" export "${GAME_DIR}/Data/StaticStream.big" --models --textures --png --by-source --out "${OUT}/art")

            message(STATUS "extracting audio (sound effects + voice)")
            run("${PYTHON}" "${RA3TOOLS}/ra3_binary.py" export "${GAME_DIR}/Data/EnglishAudio.big" --stream audio --audio --out "${OUT}/audio")

            message(STATUS "extracting movie audio")
            run("${PYTHON}" "${RA3TOOLS}/ra3_big.py" extract "${GAME_DIR}/Data/EnglishMovieAudio.big" --match "*.snd" --out "${OUT}/movies")
        endif()
    endif()
endif()

file(TOUCH "${STAMP}")