# MIT License
#
# Copyright The SCons Foundation
#
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# a copy of this software and associated documentation files (the
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# permit persons to whom the Software is furnished to do so, subject to
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#
# The above copyright notice and this permission notice shall be included
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"""SCons.Tool.javah

Tool-specific initialization for javah.

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.Tool.javac
import SCons.Util
from SCons.Tool.JavaCommon import get_java_install_dirs


def emit_java_headers(target, source, env):
    """Create and return lists of Java stub header files that will
    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)]
            classname = SCons.Tool.javac.classname(classname)
        s = src.rfile()
        s.attributes.java_classname = classname
        slist.append(s)

    s = source[0].rfile()
    if not hasattr(s.attributes, 'java_classdir'):
        s.attributes.java_classdir = classdir

    if target[0].__class__ is SCons.Node.FS.File:
        tlist = target
    else:
        if not isinstance(target[0], SCons.Node.FS.Dir):
            target[0].__class__ = SCons.Node.FS.Dir
            target[0]._morph()
        tlist = []
        for s in source:
            fname = s.attributes.java_classname.replace('.', '_') + '.h'
            t = target[0].File(fname)
            t.attributes.java_lookupdir = target[0]
            tlist.append(t)

    return tlist, source

def JavaHOutFlagGenerator(target, source, env, for_signature):
    try:
        t = target[0]
    except (AttributeError, IndexError, TypeError):
        t = target
    try:
        return '-d ' + str(t.attributes.java_lookupdir)
    except AttributeError:
        return '-o ' + str(t)

def getJavaHClassPath(env,target, source, for_signature):
    path = "${SOURCE.attributes.java_classdir}"
    if 'JAVACLASSPATH' in env and env['JAVACLASSPATH']:
        path = SCons.Util.AppendPath(path, env['JAVACLASSPATH'])
    return "-classpath %s" % path

def generate(env):
    """Add Builders and construction variables for javah to an Environment."""
    java_javah = SCons.Tool.CreateJavaHBuilder(env)
    java_javah.emitter = emit_java_headers

    if env['PLATFORM'] == 'win32':
        # Ensure that we have a proper path for javah
        paths = get_java_install_dirs('win32')
        javah = SCons.Tool.find_program_path(env, 'javah', default_paths=paths)
        if javah:
            javah_bin_dir = os.path.dirname(javah)
            env.AppendENVPath('PATH', javah_bin_dir)

    env.SetDefault(
        JAVAH='javah',
        JAVAHFLAGS=SCons.Util.CLVar(''),
        JAVACLASSSUFFIX='.class',
        JAVASUFFIX='.java',
    )
    env['_JAVAHOUTFLAG'] = JavaHOutFlagGenerator
    env['_JAVAHCLASSPATH'] = getJavaHClassPath
    env['JAVAHCOM'] = '$JAVAH $JAVAHFLAGS $_JAVAHOUTFLAG $_JAVAHCLASSPATH ${SOURCES.attributes.java_classname}'

def exists(env):
    return env.Detect('javah')

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