# MIT License
#
# Copyright The SCons Foundation
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"""Tool-specific initialization for rmic.

There normally shouldn't be any need to import this module directly.
It will usually be imported through the generic SCons.Tool.Tool()
selection method.
"""

import os.path

import SCons.Action
import SCons.Builder
import SCons.Node.FS
import SCons.Util

from SCons.Tool.JavaCommon import get_java_install_dirs


def emit_rmic_classes(target, source, env):
    """Create and return lists of Java RMI stub and skeleton
    class files to be created from a set of class files.
    """
    class_suffix = env.get('JAVACLASSSUFFIX', '.class')
    classdir = env.get('JAVACLASSDIR')

    if not classdir:
        try:
            s = source[0]
        except IndexError:
            classdir = '.'
        else:
            try:
                classdir = s.attributes.java_classdir
            except AttributeError:
                classdir = '.'
    classdir = env.Dir(classdir).rdir()
    if str(classdir) == '.':
        c_ = None
    else:
        c_ = str(classdir) + os.sep

    slist = []
    for src in source:
        try:
            classname = src.attributes.java_classname
        except AttributeError:
            classname = str(src)
            if c_ and classname[:len(c_)] == c_:
                classname = classname[len(c_):]
            if class_suffix and classname[:-len(class_suffix)] == class_suffix:
                classname = classname[-len(class_suffix):]
        s = src.rfile()
        s.attributes.java_classdir = classdir
        s.attributes.java_classname = classname
        slist.append(s)

    stub_suffixes = ['_Stub']
    if env.get('JAVAVERSION') == '1.4':
        stub_suffixes.append('_Skel')

    tlist = []
    for s in source:
        for suff in stub_suffixes:
            fname = s.attributes.java_classname.replace('.', os.sep) + \
                    suff + class_suffix
            t = target[0].File(fname)
            t.attributes.java_lookupdir = target[0]
            tlist.append(t)

    return tlist, source

RMICAction = SCons.Action.Action('$RMICCOM', '$RMICCOMSTR')

RMICBuilder = SCons.Builder.Builder(action = RMICAction,
                     emitter = emit_rmic_classes,
                     src_suffix = '$JAVACLASSSUFFIX',
                     target_factory = SCons.Node.FS.Dir,
                     source_factory = SCons.Node.FS.File)

def generate(env) -> None:
    """Add Builders and construction variables for rmic to an Environment."""
    env['BUILDERS']['RMIC'] = RMICBuilder

    if env['PLATFORM'] == 'win32':
        version = env.get('JAVAVERSION', None)
        # Ensure that we have a proper path for rmic
        paths = get_java_install_dirs('win32', version=version)
        rmic = SCons.Tool.find_program_path(env, 'rmic', default_paths=paths)
        # print("RMIC: %s"%rmic)
        if rmic:
            rmic_bin_dir = os.path.dirname(rmic)
            env.AppendENVPath('PATH', rmic_bin_dir)

    env['RMIC']            = 'rmic'
    env['RMICFLAGS']       = SCons.Util.CLVar('')
    env['RMICCOM']         = '$RMIC $RMICFLAGS -d ${TARGET.attributes.java_lookupdir} -classpath ${SOURCE.attributes.java_classdir} ${SOURCES.attributes.java_classname}'
    env['JAVACLASSSUFFIX']  = '.class'

def exists(env) -> bool:
    # As reported by Jan Nijtmans in issue #2730, the simple
    #    return env.Detect('rmic')
    # doesn't always work during initialization. For now, we
    # stop trying to detect an executable (analogous to the
    # javac Builder).
    # TODO: Come up with a proper detect() routine...and enable it.
    return True

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