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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

'''jarmaker.py provides a python class to package up chrome content by
processing jar.mn files.

See the documentation for jar.mn on MDC for further details on the format.
'''

import sys
import os
import errno
import re
import logging
from time import localtime
from MozZipFile import ZipFile
from cStringIO import StringIO

from mozbuild.util import (
    lock_file,
    PushbackIter,
)

from mozbuild.preprocessor import Preprocessor
from mozbuild.action.buildlist import addEntriesToListFile
if sys.platform == 'win32':
    from ctypes import windll, WinError
    CreateHardLink = windll.kernel32.CreateHardLinkA

__all__ = ['JarMaker']


class ZipEntry(object):
    '''Helper class for jar output.

      This class defines a simple file-like object for a zipfile.ZipEntry
      so that we can consecutively write to it and then close it.
      This methods hooks into ZipFile.writestr on close().
      '''

    def __init__(self, name, zipfile):
        self._zipfile = zipfile
        self._name = name
        self._inner = StringIO()

    def write(self, content):
        '''Append the given content to this zip entry'''

        self._inner.write(content)
        return

    def close(self):
        '''The close method writes the content back to the zip file.'''

        self._zipfile.writestr(self._name, self._inner.getvalue())


def getModTime(aPath):
    if not os.path.isfile(aPath):
        return 0
    mtime = os.stat(aPath).st_mtime
    return localtime(mtime)


class JarMaker(object):
    '''JarMaker reads jar.mn files and process those into jar files or
      flat directories, along with chrome.manifest files.
      '''

    ignore = re.compile('\s*(\#.*)?$')
    jarline = re.compile('(?:(?P<jarfile>[\w\d.\-\_\\\/]+).jar\:)|(?:\s*(\#.*)?)\s*$')
    relsrcline = re.compile('relativesrcdir\s+(?P<relativesrcdir>.+?):')
    regline = re.compile('\%\s+(.*)$')
    entryre = '(?P<optPreprocess>\*)?(?P<optOverwrite>\+?)\s+'
    entryline = re.compile(entryre
                           + '(?P<output>[\w\d.\-\_\\\/\+\@]+)\s*(\((?P<locale>\%?)(?P<source>[\w\d.\-\_\\\/\@]+)\))?\s*$'
                           )

    def __init__(self, outputFormat='flat', useJarfileManifest=True,
        useChromeManifest=False):

        self.outputFormat = outputFormat
        self.useJarfileManifest = useJarfileManifest
        self.useChromeManifest = useChromeManifest
        self.pp = Preprocessor()
        self.topsourcedir = None
        self.sourcedirs = []
        self.localedirs = None
        self.l10nbase = None
        self.l10nmerge = None
        self.relativesrcdir = None
        self.rootManifestAppId = None

    def getCommandLineParser(self):
        '''Get a optparse.OptionParser for jarmaker.

        This OptionParser has the options for jarmaker as well as
        the options for the inner PreProcessor.
        '''

        # HACK, we need to unescape the string variables we get,
        # the perl versions didn't grok strings right

        p = self.pp.getCommandLineParser(unescapeDefines=True)
        p.add_option('-f', type='choice', default='jar',
            choices=('jar', 'flat', 'symlink'),
            help='fileformat used for output',
            metavar='[jar, flat, symlink]',
            )
        p.add_option('-v', action='store_true', dest='verbose',
                     help='verbose output')
        p.add_option('-q', action='store_false', dest='verbose',
                     help='verbose output')
        p.add_option('-e', action='store_true',
                     help='create chrome.manifest instead of jarfile.manifest'
                     )
        p.add_option('--both-manifests', action='store_true',
                     dest='bothManifests',
                     help='create chrome.manifest and jarfile.manifest')
        p.add_option('-s', type='string', action='append', default=[],
                     help='source directory')
        p.add_option('-t', type='string', help='top source directory')
        p.add_option('-c', '--l10n-src', type='string', action='append'
                     , help='localization directory')
        p.add_option('--l10n-base', type='string', action='store',
                     help='base directory to be used for localization (requires relativesrcdir)'
                     )
        p.add_option('--locale-mergedir', type='string', action='store'
                     ,
                     help='base directory to be used for l10n-merge (requires l10n-base and relativesrcdir)'
                     )
        p.add_option('--relativesrcdir', type='string',
                     help='relativesrcdir to be used for localization')
        p.add_option('-j', type='string', help='jarfile directory')
        p.add_option('--root-manifest-entry-appid', type='string',
                     help='add an app id specific root chrome manifest entry.'
                     )
        return p

    def processIncludes(self, includes):
        '''Process given includes with the inner PreProcessor.

        Only use this for #defines, the includes shouldn't generate
        content.
        '''

        self.pp.out = StringIO()
        for inc in includes:
            self.pp.do_include(inc)
        includesvalue = self.pp.out.getvalue()
        if includesvalue:
            logging.info('WARNING: Includes produce non-empty output')
        self.pp.out = None

    def finalizeJar(self, jarPath, chromebasepath, register, doZip=True):
        '''Helper method to write out the chrome registration entries to
         jarfile.manifest or chrome.manifest, or both.

        The actual file processing is done in updateManifest.
        '''

        # rewrite the manifest, if entries given
        if not register:
            return

        chromeManifest = os.path.join(os.path.dirname(jarPath), '..',
                'chrome.manifest')

        if self.useJarfileManifest:
            self.updateManifest(jarPath + '.manifest',
                                chromebasepath.format(''), register)
            addEntriesToListFile(chromeManifest,
                                 ['manifest chrome/{0}.manifest'.format(os.path.basename(jarPath))])
        if self.useChromeManifest:
            self.updateManifest(chromeManifest,
                                chromebasepath.format('chrome/'),
                                register)

        # If requested, add a root chrome manifest entry (assumed to be in the parent directory
        # of chromeManifest) with the application specific id. In cases where we're building
        # lang packs, the root manifest must know about application sub directories.

        if self.rootManifestAppId:
            rootChromeManifest = \
                os.path.join(os.path.normpath(os.path.dirname(chromeManifest)),
                             '..', 'chrome.manifest')
            rootChromeManifest = os.path.normpath(rootChromeManifest)
            chromeDir = \
                os.path.basename(os.path.dirname(os.path.normpath(chromeManifest)))
            logging.info("adding '%s' entry to root chrome manifest appid=%s"
                          % (chromeDir, self.rootManifestAppId))
            addEntriesToListFile(rootChromeManifest,
                                 ['manifest %s/chrome.manifest application=%s'
                                  % (chromeDir,
                                 self.rootManifestAppId)])

    def updateManifest(self, manifestPath, chromebasepath, register):
        '''updateManifest replaces the % in the chrome registration entries
        with the given chrome base path, and updates the given manifest file.
        '''

        lock = lock_file(manifestPath + '.lck')
        try:
            myregister = dict.fromkeys(map(lambda s: s.replace('%',
                    chromebasepath), register.iterkeys()))
            manifestExists = os.path.isfile(manifestPath)
            mode = manifestExists and 'r+b' or 'wb'
            mf = open(manifestPath, mode)
            if manifestExists:
                # import previous content into hash, ignoring empty ones and comments
                imf = re.compile('(#.*)?$')
                for l in re.split('[\r\n]+', mf.read()):
                    if imf.match(l):
                        continue
                    myregister[l] = None
                mf.seek(0)
            for k in myregister.iterkeys():
                mf.write(k + os.linesep)
            mf.close()
        finally:
            lock = None

    def makeJar(self, infile, jardir):
        '''makeJar is the main entry point to JarMaker.

        It takes the input file, the output directory, the source dirs and the
        top source dir as argument, and optionally the l10n dirs.
        '''

        # making paths absolute, guess srcdir if file and add to sourcedirs
        _normpath = lambda p: os.path.normpath(os.path.abspath(p))
        self.topsourcedir = _normpath(self.topsourcedir)
        self.sourcedirs = [_normpath(p) for p in self.sourcedirs]
        if self.localedirs:
            self.localedirs = [_normpath(p) for p in self.localedirs]
        elif self.relativesrcdir:
            self.localedirs = \
                self.generateLocaleDirs(self.relativesrcdir)
        if isinstance(infile, basestring):
            logging.info('processing ' + infile)
            self.sourcedirs.append(_normpath(os.path.dirname(infile)))
        pp = self.pp.clone()
        pp.out = StringIO()
        pp.do_include(infile)
        lines = PushbackIter(pp.out.getvalue().splitlines())
        try:
            while True:
                l = lines.next()
                m = self.jarline.match(l)
                if not m:
                    raise RuntimeError(l)
                if m.group('jarfile') is None:
                    # comment
                    continue
                self.processJarSection(m.group('jarfile'), lines,
                        jardir)
        except StopIteration:
            # we read the file
            pass
        return

    def generateLocaleDirs(self, relativesrcdir):
        if os.path.basename(relativesrcdir) == 'locales':
            # strip locales
            l10nrelsrcdir = os.path.dirname(relativesrcdir)
        else:
            l10nrelsrcdir = relativesrcdir
        locdirs = []

        # generate locales dirs, merge, l10nbase, en-US
        if self.l10nmerge:
            locdirs.append(os.path.join(self.l10nmerge, l10nrelsrcdir))
        if self.l10nbase:
            locdirs.append(os.path.join(self.l10nbase, l10nrelsrcdir))
        if self.l10nmerge or not self.l10nbase:
            # add en-US if we merge, or if it's not l10n
            locdirs.append(os.path.join(self.topsourcedir,
                           relativesrcdir, 'en-US'))
        return locdirs

    def processJarSection(self, jarfile, lines, jardir):
        '''Internal method called by makeJar to actually process a section
        of a jar.mn file.

        jarfile is the basename of the jarfile or the directory name for
        flat output, lines is a PushbackIter of the lines of jar.mn,
        the remaining options are carried over from makeJar.
        '''

        # chromebasepath is used for chrome registration manifests
        # {0} is getting replaced with chrome/ for chrome.manifest, and with
        # an empty string for jarfile.manifest

        chromebasepath = '{0}' + os.path.basename(jarfile)
        if self.outputFormat == 'jar':
            chromebasepath = 'jar:' + chromebasepath + '.jar!'
        chromebasepath += '/'

        jarfile = os.path.join(jardir, jarfile)
        jf = None
        if self.outputFormat == 'jar':
            # jar
            jarfilepath = jarfile + '.jar'
            try:
                os.makedirs(os.path.dirname(jarfilepath))
            except OSError, error:
                if error.errno != errno.EEXIST:
                    raise
            jf = ZipFile(jarfilepath, 'a', lock=True)
            outHelper = self.OutputHelper_jar(jf)
        else:
            outHelper = getattr(self, 'OutputHelper_'
                                + self.outputFormat)(jarfile)
        register = {}

        # This loop exits on either
        # - the end of the jar.mn file
        # - an line in the jar.mn file that's not part of a jar section
        # - on an exception raised, close the jf in that case in a finally

        try:
            while True:
                try:
                    l = lines.next()
                except StopIteration:
                    # we're done with this jar.mn, and this jar section
                    self.finalizeJar(jarfile, chromebasepath, register)
                    if jf is not None:
                        jf.close()

                    # reraise the StopIteration for makeJar
                    raise
                if self.ignore.match(l):
                    continue
                m = self.relsrcline.match(l)
                if m:
                    relativesrcdir = m.group('relativesrcdir')
                    self.localedirs = \
                        self.generateLocaleDirs(relativesrcdir)
                    continue
                m = self.regline.match(l)
                if m:
                    rline = m.group(1)
                    register[rline] = 1
                    continue
                m = self.entryline.match(l)
                if not m:
                    # neither an entry line nor chrome reg, this jar section is done
                    self.finalizeJar(jarfile, chromebasepath, register)
                    if jf is not None:
                        jf.close()
                    lines.pushback(l)
                    return
                self._processEntryLine(m, outHelper, jf)
        finally:
            if jf is not None:
                jf.close()
        return

    def _processEntryLine(self, m, outHelper, jf):
        out = m.group('output')
        src = m.group('source') or os.path.basename(out)

        # pick the right sourcedir -- l10n, topsrc or src

        if m.group('locale'):
            src_base = self.localedirs
        elif src.startswith('/'):
            # path/in/jar/file_name.xul     (/path/in/sourcetree/file_name.xul)
            # refers to a path relative to topsourcedir, use that as base
            # and strip the leading '/'
            src_base = [self.topsourcedir]
            src = src[1:]
        else:
            # use srcdirs and the objdir (current working dir) for relative paths
            src_base = self.sourcedirs + [os.getcwd()]

        # check if the source file exists
        realsrc = None
        for _srcdir in src_base:
            if os.path.isfile(os.path.join(_srcdir, src)):
                realsrc = os.path.join(_srcdir, src)
                break
        if realsrc is None:
            if jf is not None:
                jf.close()
            raise RuntimeError('File "{0}" not found in {1}'.format(src,
                               ', '.join(src_base)))
        if m.group('optPreprocess'):
            outf = outHelper.getOutput(out)
            inf = open(realsrc)
            pp = self.pp.clone()
            if src[-4:] == '.css':
                pp.setMarker('%')
            pp.out = outf
            pp.do_include(inf)
            pp.warnUnused(realsrc)
            outf.close()
            inf.close()
            return

        # copy or symlink if newer or overwrite

        if m.group('optOverwrite') or getModTime(realsrc) \
            > outHelper.getDestModTime(m.group('output')):
            if self.outputFormat == 'symlink':
                outHelper.symlink(realsrc, out)
                return
            outf = outHelper.getOutput(out)

            # open in binary mode, this can be images etc

            inf = open(realsrc, 'rb')
            outf.write(inf.read())
            outf.close()
            inf.close()

    class OutputHelper_jar(object):
        '''Provide getDestModTime and getOutput for a given jarfile.'''

        def __init__(self, jarfile):
            self.jarfile = jarfile

        def getDestModTime(self, aPath):
            try:
                info = self.jarfile.getinfo(aPath)
                return info.date_time
            except:
                return 0

        def getOutput(self, name):
            return ZipEntry(name, self.jarfile)

    class OutputHelper_flat(object):
        '''Provide getDestModTime and getOutput for a given flat
        output directory. The helper method ensureDirFor is used by
        the symlink subclass.
        '''

        def __init__(self, basepath):
            self.basepath = basepath

        def getDestModTime(self, aPath):
            return getModTime(os.path.join(self.basepath, aPath))

        def getOutput(self, name):
            out = self.ensureDirFor(name)

            # remove previous link or file
            try:
                os.remove(out)
            except OSError, e:
                if e.errno != errno.ENOENT:
                    raise
            return open(out, 'wb')

        def ensureDirFor(self, name):
            out = os.path.join(self.basepath, name)
            outdir = os.path.dirname(out)
            if not os.path.isdir(outdir):
                try:
                    os.makedirs(outdir)
                except OSError, error:
                    if error.errno != errno.EEXIST:
                        raise
            return out

    class OutputHelper_symlink(OutputHelper_flat):
        '''Subclass of OutputHelper_flat that provides a helper for
        creating a symlink including creating the parent directories.
        '''

        def symlink(self, src, dest):
            out = self.ensureDirFor(dest)

            # remove previous link or file
            try:
                os.remove(out)
            except OSError, e:
                if e.errno != errno.ENOENT:
                    raise
            if sys.platform != 'win32':
                os.symlink(src, out)
            else:
                # On Win32, use ctypes to create a hardlink
                rv = CreateHardLink(out, src, None)
                if rv == 0:
                    raise WinError()


def main(args=None):
    args = args or sys.argv
    jm = JarMaker()
    p = jm.getCommandLineParser()
    (options, args) = p.parse_args(args)
    jm.processIncludes(options.I)
    jm.outputFormat = options.f
    jm.sourcedirs = options.s
    jm.topsourcedir = options.t
    if options.e:
        jm.useChromeManifest = True
        jm.useJarfileManifest = False
    if options.bothManifests:
        jm.useChromeManifest = True
        jm.useJarfileManifest = True
    if options.l10n_base:
        if not options.relativesrcdir:
            p.error('relativesrcdir required when using l10n-base')
        if options.l10n_src:
            p.error('both l10n-src and l10n-base are not supported')
        jm.l10nbase = options.l10n_base
        jm.relativesrcdir = options.relativesrcdir
        jm.l10nmerge = options.locale_mergedir
        if jm.l10nmerge and not os.path.isdir(jm.l10nmerge):
            logging.warning("WARNING: --locale-mergedir passed, but '%s' does not exist. "
                "Ignore this message if the locale is complete." % jm.l10nmerge)
    elif options.locale_mergedir:
        p.error('l10n-base required when using locale-mergedir')
    jm.localedirs = options.l10n_src
    if options.root_manifest_entry_appid:
        jm.rootManifestAppId = options.root_manifest_entry_appid
    noise = logging.INFO
    if options.verbose is not None:
        noise = options.verbose and logging.DEBUG or logging.WARN
    if sys.version_info[:2] > (2, 3):
        logging.basicConfig(format='%(message)s')
    else:
        logging.basicConfig()
    logging.getLogger().setLevel(noise)
    topsrc = options.t
    topsrc = os.path.normpath(os.path.abspath(topsrc))
    if not args:
        infile = sys.stdin
    else:
        (infile, ) = args
    jm.makeJar(infile, options.j)