# MIT License
#
# Copyright The SCons Foundation
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

"""Tool-specific initialization for javac.

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
import os.path
from collections import OrderedDict

import SCons.Action
import SCons.Builder
from SCons.Node.FS import _my_normcase
from SCons.Tool.JavaCommon import parse_java_file, get_java_install_dirs, get_java_include_paths
import SCons.Util

def classname(path):
    """Turn a string (path name) into a Java class name."""
    return os.path.normpath(path).replace(os.sep, '.')

def emit_java_classes(target, source, env):
    """Create and return lists of source java files
    and their corresponding target class files.
    """
    java_suffix = env.get('JAVASUFFIX', '.java')
    class_suffix = env.get('JAVACLASSSUFFIX', '.class')

    target[0].must_be_same(SCons.Node.FS.Dir)
    classdir = target[0]

    s = source[0].rentry().disambiguate()
    if isinstance(s, SCons.Node.FS.File):
        sourcedir = s.dir.rdir()
    elif isinstance(s, SCons.Node.FS.Dir):
        sourcedir = s.rdir()
    else:
        raise SCons.Errors.UserError("Java source must be File or Dir, not '%s'" % s.__class__)

    slist = []
    js = _my_normcase(java_suffix)
    for entry in source:
        entry = entry.rentry().disambiguate()
        if isinstance(entry, SCons.Node.FS.File):
            slist.append(entry)
        elif isinstance(entry, SCons.Node.FS.Dir):
            result = OrderedDict()
            dirnode = entry.rdir()
            def find_java_files(arg, dirpath, filenames) -> None:
                java_files = sorted([n for n in filenames
                                       if _my_normcase(n).endswith(js)])
                mydir = dirnode.Dir(dirpath)
                java_paths = [mydir.File(f) for f in java_files]
                for jp in java_paths:
                     arg[jp] = True
            for dirpath, dirnames, filenames in os.walk(dirnode.get_abspath()):
               find_java_files(result, dirpath, filenames)
            entry.walk(find_java_files, result)

            slist.extend(list(result.keys()))
        else:
            raise SCons.Errors.UserError("Java source must be File or Dir, not '%s'" % entry.__class__)

    version = env.get('JAVAVERSION', '1.4')
    full_tlist = []
    for f in slist:
        tlist = []
        source_file_based = True
        pkg_dir = None
        if not f.is_derived():
            pkg_dir, classes = parse_java_file(f.rfile().get_abspath(), version)
            if classes:
                source_file_based = False
                if pkg_dir:
                    d = target[0].Dir(pkg_dir)
                    p = pkg_dir + os.sep
                else:
                    d = target[0]
                    p = ''
                for c in classes:
                    t = d.File(c + class_suffix)
                    t.attributes.java_classdir = classdir
                    t.attributes.java_sourcedir = sourcedir
                    t.attributes.java_classname = classname(p + c)
                    tlist.append(t)

        if source_file_based:
            base = f.name[:-len(java_suffix)]
            if pkg_dir:
                t = target[0].Dir(pkg_dir).File(base + class_suffix)
            else:
                t = target[0].File(base + class_suffix)
            t.attributes.java_classdir = classdir
            t.attributes.java_sourcedir = f.dir
            t.attributes.java_classname = classname(base)
            tlist.append(t)

        for t in tlist:
            t.set_specific_source([f])

        full_tlist.extend(tlist)

    return full_tlist, slist

JavaAction = SCons.Action.Action('$JAVACCOM', '$JAVACCOMSTR')

JavaBuilder = SCons.Builder.Builder(action = JavaAction,
                    emitter = emit_java_classes,
                    target_factory = SCons.Node.FS.Entry,
                    source_factory = SCons.Node.FS.Entry)

class pathopt:
    """
    Callable object for generating javac-style path options from
    a construction variable (e.g. -classpath, -sourcepath).
    """
    def __init__(self, opt, var, default=None) -> None:
        self.opt = opt
        self.var = var
        self.default = default

    def __call__(self, target, source, env, for_signature):
        path = env[self.var]
        if path and not SCons.Util.is_List(path):
            path = [path]
        if self.default:
            default = env[self.default]
            if default:
                if not SCons.Util.is_List(default):
                    default = [default]
                path = path + default
        if path:
            path = SCons.Util.flatten(path)
            return [self.opt, os.pathsep.join(map(str, path))]
        else:
            return []

def Java(env, target, source, *args, **kw):
    """
    A pseudo-Builder wrapper around the separate JavaClass{File,Dir}
    Builders.
    """
    if not SCons.Util.is_List(target):
        target = [target]
    if not SCons.Util.is_List(source):
        source = [source]

    # Pad the target list with repetitions of the last element in the
    # list so we have a target for every source element.
    target = target + ([target[-1]] * (len(source) - len(target)))

    java_suffix = env.subst('$JAVASUFFIX')
    result = []

    for t, s in zip(target, source):
        if isinstance(s, SCons.Node.FS.Base):
            if isinstance(s, SCons.Node.FS.File):
                b = env.JavaClassFile
            else:
                b = env.JavaClassDir
        else:
            if os.path.isfile(s):
                b = env.JavaClassFile
            elif os.path.isdir(s):
                b = env.JavaClassDir
            elif s[-len(java_suffix):] == java_suffix:
                b = env.JavaClassFile
            else:
                b = env.JavaClassDir
        result.extend(b(t, s, *args, **kw))

    return result

def generate(env) -> None:
    """Add Builders and construction variables for javac to an Environment."""
    java_file = SCons.Tool.CreateJavaFileBuilder(env)
    java_class = SCons.Tool.CreateJavaClassFileBuilder(env)
    java_class_dir = SCons.Tool.CreateJavaClassDirBuilder(env)
    java_class.add_emitter(None, emit_java_classes)
    java_class.add_emitter(env.subst('$JAVASUFFIX'), emit_java_classes)
    java_class_dir.emitter = emit_java_classes

    env.AddMethod(Java)

    version = env.get('JAVAVERSION', None)

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


    env.SetDefault(
        JAVAC='javac',
        JAVACFLAGS=SCons.Util.CLVar(''),
        JAVAINCLUDES=get_java_include_paths(env, javac, version),
        JAVACLASSSUFFIX='.class',
        JAVASUFFIX='.java',
        JAVABOOTCLASSPATH=[],
        JAVACLASSPATH=[],
        JAVASOURCEPATH=[],
        JAVAPROCESSORPATH=[],
    )
    env['_javapathopt'] = pathopt
    env['_JAVABOOTCLASSPATH'] = '${_javapathopt("-bootclasspath", "JAVABOOTCLASSPATH")} '
    env['_JAVAPROCESSORPATH'] = '${_javapathopt("-processorpath", "JAVAPROCESSORPATH")} '
    env['_JAVACLASSPATH'] = '${_javapathopt("-classpath", "JAVACLASSPATH")} '
    env['_JAVASOURCEPATH'] = '${_javapathopt("-sourcepath", "JAVASOURCEPATH", "_JAVASOURCEPATHDEFAULT")} '
    env['_JAVASOURCEPATHDEFAULT'] = '${TARGET.attributes.java_sourcedir}'
    env['_JAVACCOM'] = '$JAVAC $JAVACFLAGS $_JAVABOOTCLASSPATH $_JAVAPROCESSORPATH $_JAVACLASSPATH -d ${TARGET.attributes.java_classdir} $_JAVASOURCEPATH $SOURCES'
    env['JAVACCOM'] = "${TEMPFILE('$_JAVACCOM','$JAVACCOMSTR')}"

def exists(env) -> bool:
    return True

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