# Find the native box2d headers
#
#  BOX2D_INCLUDE_DIR  - where to find box2denc.h, etc.
#  BOX2D_LIBRARIES    - box2d library
#  BOX2D_FOUND        - True if box2d found.

IF(BOX2D_FOUND)
    # Already in cache, be silent
    SET(BOX2D_FIND_QUIETLY TRUE)
ENDIF()

IF(BUILD_BOX2D OR ACGL_GLOBAL_EXTERN_DIR_FOUND_FIRST_TIME OR BUILD_TYPE_CHANGED)
    UNSET(BOX2D_INCLUDE_DIR CACHE)
    UNSET(BOX2D_LIBRARIES CACHE)
ENDIF()

IF(BUILD_BOX2D)
    SET(BOX2D_INCLUDE_DIR "${ACGL_LOCAL_EXTERN_DIR}/box2d")
    SET(BOX2D_LIBRARIES Box2D${COMPILE_POSTFIX})
ELSE()
    # Look for the header file.
    IF(ACGL_GLOBAL_EXTERN_DIR)
        FIND_PATH(BOX2D_INCLUDE_DIR NAMES Box2D/Box2D.h PATHS "${ACGL_GLOBAL_EXTERN_DIR}/box2d" NO_DEFAULT_PATH)
    ENDIF()
    IF(NOT BOX2D_INCLUDE_DIR)
        FIND_PATH(BOX2D_INCLUDE_DIR NAMES Box2D/Box2D.h)
    ENDIF()

    # Look for the library file.
    IF(ACGL_GLOBAL_EXTERN_DIR)
        FIND_LIBRARY(BOX2D_LIBRARIES NAMES Box2D${COMPILE_POSTFIX} PATHS "${ACGL_GLOBAL_EXTERN_DIR}/box2d/lib" NO_DEFAULT_PATH)
    ENDIF()
    IF(NOT BOX2D_LIBRARIES)
        FIND_LIBRARY(BOX2D_LIBRARIES NAMES Box2D${COMPILE_POSTFIX})
    ENDIF()
ENDIF()

# Copy the results to the output variables.
IF(BOX2D_INCLUDE_DIR AND BOX2D_LIBRARIES)
    SET(BOX2D_FOUND TRUE CACHE INTERNAL "")
ELSE()
    SET(BOX2D_FOUND FALSE CACHE INTERNAL "")
ENDIF()

# Report the results.
IF(NOT BOX2D_FOUND)
    SET(BOX2D_MESSAGE "box2d was not found. Make sure BOX2D_INCLUDE_DIR AND BOX2D_LIBRARIES are set correctly.")
    IF(BOX2D_FIND_REQUIRED)
        MESSAGE(FATAL_ERROR "${BOX2D_MESSAGE}")
    ELSEIF(NOT BOX2D_FIND_QUIETLY)
        MESSAGE(STATUS "${BOX2D_MESSAGE}")
    ENDIF()
ELSEIF(NOT BOX2D_FIND_QUIETLY)
    MESSAGE(STATUS "Looking for box2d - found")
ENDIF()

MESSAGE(STATUS "BOX2D_INCLUDE_DIR:${BOX2D_INCLUDE_DIR}")
MESSAGE(STATUS "BOX2D_LIBRARIES:${BOX2D_LIBRARIES}")