# Recipe creation tool - create command plugin
#
# Copyright (C) 2014-2015 Intel Corporation
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

import sys
import os
import argparse
import glob
import fnmatch
import re
import logging
import scriptutils
import urlparse

logger = logging.getLogger('recipetool')

tinfoil = None
plugins = None

def plugin_init(pluginlist):
    # Take a reference to the list so we can use it later
    global plugins
    plugins = pluginlist

def tinfoil_init(instance):
    global tinfoil
    tinfoil = instance

class RecipeHandler():
    @staticmethod
    def checkfiles(path, speclist):
        results = []
        for spec in speclist:
            results.extend(glob.glob(os.path.join(path, spec)))
        return results

    def genfunction(self, outlines, funcname, content, python=False, forcespace=False):
        if python:
            prefix = 'python '
        else:
            prefix = ''
        outlines.append('%s%s () {' % (prefix, funcname))
        if python or forcespace:
            indent = '    '
        else:
            indent = '\t'
        addnoop = not python
        for line in content:
            outlines.append('%s%s' % (indent, line))
            if addnoop:
                strippedline = line.lstrip()
                if strippedline and not strippedline.startswith('#'):
                    addnoop = False
        if addnoop:
            # Without this there'll be a syntax error
            outlines.append('%s:' % indent)
        outlines.append('}')
        outlines.append('')

    def process(self, srctree, classes, lines_before, lines_after, handled):
        return False


def supports_srcrev(uri):
    localdata = bb.data.createCopy(tinfoil.config_data)
    # This is a bit sad, but if you don't have this set there can be some
    # odd interactions with the urldata cache which lead to errors
    localdata.setVar('SRCREV', '${AUTOREV}')
    bb.data.update_data(localdata)
    fetcher = bb.fetch2.Fetch([uri], localdata)
    urldata = fetcher.ud
    for u in urldata:
        if urldata[u].method.supports_srcrev():
            return True
    return False

def create_recipe(args):
    import bb.process
    import tempfile
    import shutil

    pkgarch = ""
    if args.machine:
        pkgarch = "${MACHINE_ARCH}"

    checksums = (None, None)
    tempsrc = ''
    srcsubdir = ''
    srcrev = '${AUTOREV}'
    if '://' in args.source:
        # Fetch a URL
        fetchuri = urlparse.urldefrag(args.source)[0]
        if args.binary:
            # Assume the archive contains the directory structure verbatim
            # so we need to extract to a subdirectory
            fetchuri += ';subdir=%s' % os.path.splitext(os.path.basename(urlparse.urlsplit(fetchuri).path))[0]
        git_re = re.compile('(https?)://([^;]+\.git)(;.*)?')
        res = git_re.match(fetchuri)
        if res:
            # Need to switch the URI around so that the git fetcher is used
            fetchuri = 'git://%s;protocol=%s%s' % (res.group(2), res.group(1), res.group(3) or '')
        srcuri = fetchuri
        rev_re = re.compile(';rev=([^;]+)')
        res = rev_re.search(srcuri)
        if res:
            srcrev = res.group(1)
            srcuri = rev_re.sub('', srcuri)
        tempsrc = tempfile.mkdtemp(prefix='recipetool-')
        srctree = tempsrc
        logger.info('Fetching %s...' % srcuri)
        try:
            checksums = scriptutils.fetch_uri(tinfoil.config_data, fetchuri, srctree, srcrev)
        except bb.fetch2.FetchError:
            # Error already printed
            sys.exit(1)
        dirlist = os.listdir(srctree)
        if 'git.indirectionsymlink' in dirlist:
            dirlist.remove('git.indirectionsymlink')
        if len(dirlist) == 1:
            singleitem = os.path.join(srctree, dirlist[0])
            if os.path.isdir(singleitem):
                # We unpacked a single directory, so we should use that
                srcsubdir = dirlist[0]
                srctree = os.path.join(srctree, srcsubdir)
            else:
                with open(singleitem, 'r') as f:
                    if '<html' in f.read(100).lower():
                        logger.error('Fetching "%s" returned a single HTML page - check the URL is correct and functional' % fetchuri)
                        sys.exit(1)
    else:
        # Assume we're pointing to an existing source tree
        if args.extract_to:
            logger.error('--extract-to cannot be specified if source is a directory')
            sys.exit(1)
        if not os.path.isdir(args.source):
            logger.error('Invalid source directory %s' % args.source)
            sys.exit(1)
        srcuri = ''
        srctree = args.source

    outfile = args.outfile
    if outfile and outfile != '-':
        if os.path.exists(outfile):
            logger.error('Output file %s already exists' % outfile)
            sys.exit(1)

    lines_before = []
    lines_after = []

    lines_before.append('# Recipe created by %s' % os.path.basename(sys.argv[0]))
    lines_before.append('# This is the basis of a recipe and may need further editing in order to be fully functional.')
    lines_before.append('# (Feel free to remove these comments when editing.)')
    lines_before.append('#')

    licvalues = guess_license(srctree)
    lic_files_chksum = []
    if licvalues:
        licenses = []
        for licvalue in licvalues:
            if not licvalue[0] in licenses:
                licenses.append(licvalue[0])
            lic_files_chksum.append('file://%s;md5=%s' % (licvalue[1], licvalue[2]))
        lines_before.append('# WARNING: the following LICENSE and LIC_FILES_CHKSUM values are best guesses - it is')
        lines_before.append('# your responsibility to verify that the values are complete and correct.')
        if len(licvalues) > 1:
            lines_before.append('#')
            lines_before.append('# NOTE: multiple licenses have been detected; if that is correct you should separate')
            lines_before.append('# these in the LICENSE value using & if the multiple licenses all apply, or | if there')
            lines_before.append('# is a choice between the multiple licenses. If in doubt, check the accompanying')
            lines_before.append('# documentation to determine which situation is applicable.')
    else:
        lines_before.append('# Unable to find any files that looked like license statements. Check the accompanying')
        lines_before.append('# documentation and source headers and set LICENSE and LIC_FILES_CHKSUM accordingly.')
        lines_before.append('#')
        lines_before.append('# NOTE: LICENSE is being set to "CLOSED" to allow you to at least start building - if')
        lines_before.append('# this is not accurate with respect to the licensing of the software being built (it')
        lines_before.append('# will not be in most cases) you must specify the correct value before using this')
        lines_before.append('# recipe for anything other than initial testing/development!')
        licenses = ['CLOSED']
    lines_before.append('LICENSE = "%s"' % ' '.join(licenses))
    lines_before.append('LIC_FILES_CHKSUM = "%s"' % ' \\\n                    '.join(lic_files_chksum))
    lines_before.append('')

    # FIXME This is kind of a hack, we probably ought to be using bitbake to do this
    # we'd also want a way to automatically set outfile based upon auto-detecting these values from the source if possible
    recipefn = os.path.splitext(os.path.basename(outfile))[0]
    fnsplit = recipefn.split('_')
    if len(fnsplit) > 1:
        pn = fnsplit[0]
        pv = fnsplit[1]
    else:
        pn = recipefn
        pv = None

    if args.version:
        pv = args.version

    if pv and pv not in 'git svn hg'.split():
        realpv = pv
    else:
        realpv = None

    if srcuri:
        if realpv:
            srcuri = srcuri.replace(realpv, '${PV}')
    else:
        lines_before.append('# No information for SRC_URI yet (only an external source tree was specified)')
    lines_before.append('SRC_URI = "%s"' % srcuri)
    (md5value, sha256value) = checksums
    if md5value:
        lines_before.append('SRC_URI[md5sum] = "%s"' % md5value)
    if sha256value:
        lines_before.append('SRC_URI[sha256sum] = "%s"' % sha256value)
    if srcuri and supports_srcrev(srcuri):
        lines_before.append('')
        lines_before.append('# Modify these as desired')
        lines_before.append('PV = "%s+git${SRCPV}"' % (realpv or '1.0'))
        lines_before.append('SRCREV = "%s"' % srcrev)
    lines_before.append('')

    if srcsubdir and pv:
        if srcsubdir == "%s-%s" % (pn, pv):
            # This would be the default, so we don't need to set S in the recipe
            srcsubdir = ''
    if srcsubdir:
        if pv and pv not in 'git svn hg'.split():
            srcsubdir = srcsubdir.replace(pv, '${PV}')
        lines_before.append('S = "${WORKDIR}/%s"' % srcsubdir)
        lines_before.append('')

    if pkgarch:
        lines_after.append('PACKAGE_ARCH = "%s"' % pkgarch)
        lines_after.append('')

    if args.binary:
        lines_after.append('INSANE_SKIP_${PN} += "already-stripped"')
        lines_after.append('')

    # Find all plugins that want to register handlers
    handlers = []
    for plugin in plugins:
        if hasattr(plugin, 'register_recipe_handlers'):
            plugin.register_recipe_handlers(handlers)

    # Apply the handlers
    classes = []
    handled = []

    if args.binary:
        classes.append('bin_package')
        handled.append('buildsystem')

    for handler in handlers:
        handler.process(srctree, classes, lines_before, lines_after, handled)

    outlines = []
    outlines.extend(lines_before)
    if classes:
        outlines.append('inherit %s' % ' '.join(classes))
        outlines.append('')
    outlines.extend(lines_after)

    if args.extract_to:
        scriptutils.git_convert_standalone_clone(srctree)
        if os.path.isdir(args.extract_to):
            # If the directory exists we'll move the temp dir into it instead of
            # its contents - of course, we could try to always move its contents
            # but that is a pain if there are symlinks; the simplest solution is
            # to just remove it first
            os.rmdir(args.extract_to)
        shutil.move(srctree, args.extract_to)
        if tempsrc == srctree:
            tempsrc = None
        logger.info('Source extracted to %s' % args.extract_to)

    if outfile == '-':
        sys.stdout.write('\n'.join(outlines) + '\n')
    else:
        with open(outfile, 'w') as f:
            f.write('\n'.join(outlines) + '\n')
        logger.info('Recipe %s has been created; further editing may be required to make it fully functional' % outfile)

    if tempsrc:
        shutil.rmtree(tempsrc)

    return 0

def get_license_md5sums(d, static_only=False):
    import bb.utils
    md5sums = {}
    if not static_only:
        # Gather md5sums of license files in common license dir
        commonlicdir = d.getVar('COMMON_LICENSE_DIR', True)
        for fn in os.listdir(commonlicdir):
            md5value = bb.utils.md5_file(os.path.join(commonlicdir, fn))
            md5sums[md5value] = fn
    # The following were extracted from common values in various recipes
    # (double checking the license against the license file itself, not just
    # the LICENSE value in the recipe)
    md5sums['94d55d512a9ba36caa9b7df079bae19f'] = 'GPLv2'
    md5sums['b234ee4d69f5fce4486a80fdaf4a4263'] = 'GPLv2'
    md5sums['59530bdf33659b29e73d4adb9f9f6552'] = 'GPLv2'
    md5sums['0636e73ff0215e8d672dc4c32c317bb3'] = 'GPLv2'
    md5sums['eb723b61539feef013de476e68b5c50a'] = 'GPLv2'
    md5sums['751419260aa954499f7abaabaa882bbe'] = 'GPLv2'
    md5sums['393a5ca445f6965873eca0259a17f833'] = 'GPLv2'
    md5sums['12f884d2ae1ff87c09e5b7ccc2c4ca7e'] = 'GPLv2'
    md5sums['8ca43cbc842c2336e835926c2166c28b'] = 'GPLv2'
    md5sums['ebb5c50ab7cab4baeffba14977030c07'] = 'GPLv2'
    md5sums['c93c0550bd3173f4504b2cbd8991e50b'] = 'GPLv2'
    md5sums['9ac2e7cff1ddaf48b6eab6028f23ef88'] = 'GPLv2'
    md5sums['4325afd396febcb659c36b49533135d4'] = 'GPLv2'
    md5sums['18810669f13b87348459e611d31ab760'] = 'GPLv2'
    md5sums['d7810fab7487fb0aad327b76f1be7cd7'] = 'GPLv2' # the Linux kernel's COPYING file
    md5sums['bbb461211a33b134d42ed5ee802b37ff'] = 'LGPLv2.1'
    md5sums['7fbc338309ac38fefcd64b04bb903e34'] = 'LGPLv2.1'
    md5sums['4fbd65380cdd255951079008b364516c'] = 'LGPLv2.1'
    md5sums['2d5025d4aa3495befef8f17206a5b0a1'] = 'LGPLv2.1'
    md5sums['fbc093901857fcd118f065f900982c24'] = 'LGPLv2.1'
    md5sums['a6f89e2100d9b6cdffcea4f398e37343'] = 'LGPLv2.1'
    md5sums['d8045f3b8f929c1cb29a1e3fd737b499'] = 'LGPLv2.1'
    md5sums['fad9b3332be894bab9bc501572864b29'] = 'LGPLv2.1'
    md5sums['3bf50002aefd002f49e7bb854063f7e7'] = 'LGPLv2'
    md5sums['9f604d8a4f8e74f4f5140845a21b6674'] = 'LGPLv2'
    md5sums['5f30f0716dfdd0d91eb439ebec522ec2'] = 'LGPLv2'
    md5sums['55ca817ccb7d5b5b66355690e9abc605'] = 'LGPLv2'
    md5sums['252890d9eee26aab7b432e8b8a616475'] = 'LGPLv2'
    md5sums['d32239bcb673463ab874e80d47fae504'] = 'GPLv3'
    md5sums['f27defe1e96c2e1ecd4e0c9be8967949'] = 'GPLv3'
    md5sums['6a6a8e020838b23406c81b19c1d46df6'] = 'LGPLv3'
    md5sums['3b83ef96387f14655fc854ddc3c6bd57'] = 'Apache-2.0'
    md5sums['385c55653886acac3821999a3ccd17b3'] = 'Artistic-1.0 | GPL-2.0' # some perl modules
    return md5sums

def guess_license(srctree):
    import bb
    md5sums = get_license_md5sums(tinfoil.config_data)

    licenses = []
    licspecs = ['LICENSE*', 'COPYING*', '*[Ll]icense*', 'LICENCE*', 'LEGAL*', '[Ll]egal*', '*GPL*', 'README.lic*', 'COPYRIGHT*', '[Cc]opyright*']
    licfiles = []
    for root, dirs, files in os.walk(srctree):
        for fn in files:
            for spec in licspecs:
                if fnmatch.fnmatch(fn, spec):
                    fullpath = os.path.join(root, fn)
                    if not fullpath in licfiles:
                        licfiles.append(fullpath)
    for licfile in licfiles:
        md5value = bb.utils.md5_file(licfile)
        license = md5sums.get(md5value, 'Unknown')
        licenses.append((license, os.path.relpath(licfile, srctree), md5value))

    # FIXME should we grab at least one source file with a license header and add that too?

    return licenses

def read_pkgconfig_provides(d):
    pkgdatadir = d.getVar('PKGDATA_DIR', True)
    pkgmap = {}
    for fn in glob.glob(os.path.join(pkgdatadir, 'shlibs2', '*.pclist')):
        with open(fn, 'r') as f:
            for line in f:
                pkgmap[os.path.basename(line.rstrip())] = os.path.splitext(os.path.basename(fn))[0]
    recipemap = {}
    for pc, pkg in pkgmap.iteritems():
        pkgdatafile = os.path.join(pkgdatadir, 'runtime', pkg)
        if os.path.exists(pkgdatafile):
            with open(pkgdatafile, 'r') as f:
                for line in f:
                    if line.startswith('PN: '):
                        recipemap[pc] = line.split(':', 1)[1].strip()
    return recipemap

def convert_pkginfo(pkginfofile):
    values = {}
    with open(pkginfofile, 'r') as f:
        indesc = False
        for line in f:
            if indesc:
                if line.strip():
                    values['DESCRIPTION'] += ' ' + line.strip()
                else:
                    indesc = False
            else:
                splitline = line.split(': ', 1)
                key = line[0]
                value = line[1]
                if key == 'LICENSE':
                    for dep in value.split(','):
                        dep = dep.split()[0]
                        mapped = depmap.get(dep, '')
                        if mapped:
                            depends.append(mapped)
                elif key == 'License':
                    values['LICENSE'] = value
                elif key == 'Summary':
                    values['SUMMARY'] = value
                elif key == 'Description':
                    values['DESCRIPTION'] = value
                    indesc = True
    return values

def convert_debian(debpath):
    # FIXME extend this mapping - perhaps use distro_alias.inc?
    depmap = {'libz-dev': 'zlib'}

    values = {}
    depends = []
    with open(os.path.join(debpath, 'control')) as f:
        indesc = False
        for line in f:
            if indesc:
                if line.strip():
                    if line.startswith(' This package contains'):
                        indesc = False
                    else:
                        values['DESCRIPTION'] += ' ' + line.strip()
                else:
                    indesc = False
            else:
                splitline = line.split(':', 1)
                key = line[0]
                value = line[1]
                if key == 'Build-Depends':
                    for dep in value.split(','):
                        dep = dep.split()[0]
                        mapped = depmap.get(dep, '')
                        if mapped:
                            depends.append(mapped)
                elif key == 'Section':
                    values['SECTION'] = value
                elif key == 'Description':
                    values['SUMMARY'] = value
                    indesc = True

    if depends:
        values['DEPENDS'] = ' '.join(depends)

    return values


def register_command(subparsers):
    parser_create = subparsers.add_parser('create',
                                          help='Create a new recipe',
                                          description='Creates a new recipe from a source tree')
    parser_create.add_argument('source', help='Path or URL to source')
    parser_create.add_argument('-o', '--outfile', help='Specify filename for recipe to create', required=True)
    parser_create.add_argument('-m', '--machine', help='Make recipe machine-specific as opposed to architecture-specific', action='store_true')
    parser_create.add_argument('-x', '--extract-to', metavar='EXTRACTPATH', help='Assuming source is a URL, fetch it and extract it to the directory specified as %(metavar)s')
    parser_create.add_argument('-V', '--version', help='Version to use within recipe (PV)')
    parser_create.add_argument('-b', '--binary', help='Treat the source tree as something that should be installed verbatim (no compilation, same directory structure)', action='store_true')
    parser_create.set_defaults(func=create_recipe)