import os.path, sys

def _PackageOption(pkgName, default=1):
    """ Allow user to choose whether a package should be used if available. This results in a commandline option use<Pkgname>,
    where Pkgname is the name of the package with a capitalized first letter.
    @param pkgName: Name of package.
    @param default: The default value for this option ("yes"/"no").
    """
    return BoolOption("use%s" % pkgName[0].upper() + pkgName[1:], "use %s if available" % (pkgName), default)

def _BoolOption(opt, explanation, default=1):
    """ Allow user to enable/disable a certain option. This results in a commandline option enable<Option>, where Option
    is the name of the option with a capitalized first letter.
    @param opt: Name of option.
    @param explanation: Explanation of option.
    @param default: The default value for this option (1/0).
    """
    return BoolOption("enable%s" % opt[0].upper() + opt[1:], explanation, default)

def _EnumOption(opt, explanation, allowedValues, default):
    """ Allow the user to choose among a set of values for an option. This results in a commandline option with<Option>,
    where Option is the name of the option with a capitalized first letter.
    @param opt: The name of the option.
    @param explanation: Explanation of option.
    @param allowedValues: The set of values to choose from.
    @param default: The default value.
    """
    assert default in allowedValues
    return EnumOption("with%s" % opt[0].upper() + opt[1:], explanation, default, allowed_values=allowedValues)

def _DirectoryOption(opt, explanation, default):
    """ Allow the user to configure the location for a certain directory, for instance the prefix. This results in a
    commandline option which is simply the name of this option.
    @param opt: The configurable directory, for instance "prefix".
    @param explanation: Explanation of option.
    @param default: The default value for this option.
    """
    return PathOption(opt, explanation, default)
    # Incompatible with the latest stable SCons
    # return PathOption(path, help, default, PathOption.PathIsDir)

import SCons.Errors
try:
    Import("Platform", "Posix")
except SCons.Errors.UserError:
    # The common objects must be exported first
    SConscript("SConscript_common")
    Import("Platform", "Posix")

# Expose the options as a dictionary of sets of options
opts = {}

if Platform in Posix:
    opts["Installation Dirs"] = [_DirectoryOption("prefix", "installation prefix", "/usr/local")]
elif Platform in Windows:
    if Platform == "cygwin":
        opts["Installation Dirs"] = [_DirectoryOption("prefix", "installation prefix", "/usr/local")]

opts["Build Targets"] = [_BoolOption("shared", "create shared library"), _BoolOption("static", "create static library"),
        _BoolOption("tests", "build test programs")]

apis = []
if Platform in Posix:
    apis.append(_PackageOption("OSS"))
    apis.append(_PackageOption("JACK"))
    if Platform == "linux":
        apis.append(_PackageOption("ALSA"))
        apis.append(_PackageOption("ASIHPI"))
elif Platform in Windows:
    if Platform == "cygwin":
        apis.append(_EnumOption("winAPI", "Windows API to use", ("wmme", "directx", "asio"), "wmme"))
elif Platform == "darwin":
    apis.append(_EnumOption("macAPI", "Mac API to use", ("asio", "core", "sm"), "core"))
opts["Host APIs"] = apis

opts["Build Parameters"] = [\
        _BoolOption("debug", "compile with debug symbols"),
        _BoolOption("optimize", "compile with optimization", default=0),
        _BoolOption("asserts", "runtime assertions are helpful for debugging, but can be detrimental to performance",
                default=1),
        _BoolOption("debugOutput", "enable debug output", default=0),
        # _BoolOption("python", "create Python binding"),
        ("customCFlags", "customize compilation of C code", ""),
        ("customCxxFlags", "customize compilation of C++ code", ""),
        ("customLinkFlags", "customize linking", ""),
        ]

opts["Bindings"] = [\
        _BoolOption("cxx", "build Merlijn Blaauw's PA C++ wrapper", default=0)
        ]
    
Return("opts")
