##
# Copyright 2009-2010 Jakob Westhoff. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#    1. Redistributions of source code must retain the above copyright notice,
#       this list of conditions and the following disclaimer.
#
#    2. Redistributions in binary form must reproduce the above copyright notice,
#       this list of conditions and the following disclaimer in the documentation
#       and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY JAKOB WESTHOFF ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
# EVENT SHALL JAKOB WESTHOFF OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# The views and conclusions contained in the software and documentation are those
# of the authors and should not be interpreted as representing official policies,
# either expressed or implied, of Jakob Westhoff
##

# Bundle version: 0.9
#
# File version  : 1.0
# File History:
#    - Alpha 1


include(ParseArguments)
find_package(Vala REQUIRED)

##
# Ensure a certain valac version is available
#
# The initial argument is the version to check for
#
# It may be followed by a optional parameter to specifiy a version range. The
# following options are valid:
#
# EXACT
#   Vala needs to be available in the exact version given
#
# MINIMUM
#   The provided version is the minimum version. Therefore Vala needs to be
#   available in the given version or any higher version
#
# MAXIMUM
#   The provided version is the maximum. Therefore Vala needs to be available
#   in the given version or any version older than this
#
# If no option is specified the version will be treated as a minimal version.
##
macro(ensure_vala_version version)
    parse_arguments(ARGS "" "MINIMUM;MAXIMUM;EXACT" ${ARGN})
    set(compare_message "")
    set(error_message "")
    if(ARGS_MINIMUM)
        set(compare_message "a minimum ")
        set(error_message "or greater ")
    elseif(ARGS_MAXIMUM)
        set(compare_message "a maximum ")
        set(error_message "or less ")
    endif(ARGS_MINIMUM)

    message(STATUS
        "checking for ${compare_message}Vala version of ${version}"
    )

    unset(version_accepted)

    # MINIMUM is the default if no option is specified
    if(ARGS_EXACT)
        if(${VALA_VERSION} VERSION_EQUAL ${version} )
            set(version_accepted TRUE)
        endif(${VALA_VERSION} VERSION_EQUAL ${version})
    elseif(ARGS_MAXIMUM)
        if(${VALA_VERSION} VERSION_LESS ${version} OR ${VALA_VERSION} VERSION_EQUAL ${version})
            set(version_accepted TRUE)
        endif(${VALA_VERSION} VERSION_LESS ${version} OR ${VALA_VERSION} VERSION_EQUAL ${version})
    else(ARGS_MAXIMUM)
        if(${VALA_VERSION} VERSION_GREATER ${version} OR ${VALA_VERSION} VERSION_EQUAL ${version})
            set(version_accepted TRUE)
        endif(${VALA_VERSION} VERSION_GREATER ${version} OR ${VALA_VERSION} VERSION_EQUAL ${version})
    endif(ARGS_EXACT)

    if (NOT version_accepted)
        message(FATAL_ERROR
            "Vala version ${version} ${error_message}is required."
        )
    endif(NOT version_accepted)

    message(STATUS
        "  found Vala, version ${VALA_VERSION}"
    )
endmacro(ensure_vala_version)
