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#!/usr/bin/env python

# This script has subcommands which operate against your bitbake layers, either
# displaying useful information, or acting against them.
# See the help output for details on available commands.

import cmd
import logging
import os
import sys
import fnmatch

bindir = os.path.dirname(__file__)
topdir = os.path.dirname(bindir)
sys.path[0:0] = [os.path.join(topdir, 'lib')]

import bb.cache
import bb.cooker
import bb.providers
import bb.utils
from bb.cooker import state
import bb.fetch2


logger = logging.getLogger('BitBake')


def main(args):
    # Set up logging
    console = logging.StreamHandler(sys.stdout)
    format = bb.msg.BBLogFormatter("%(levelname)s: %(message)s")
    bb.msg.addDefaultlogFilter(console)
    console.setFormatter(format)
    logger.addHandler(console)

    initialenv = os.environ.copy()
    bb.utils.clean_environment()

    cmds = Commands(initialenv)
    if args:
        cmds.onecmd(' '.join(args))
    else:
        cmds.do_help('')
    return cmds.returncode


class Commands(cmd.Cmd):
    def __init__(self, initialenv):
        cmd.Cmd.__init__(self)
        self.returncode = 0
        self.config = Config(parse_only=True)
        self.cooker = bb.cooker.BBCooker(self.config,
                                         self.register_idle_function,
                                         initialenv)
        self.config_data = self.cooker.configuration.data
        bb.providers.logger.setLevel(logging.ERROR)
        self.cooker_data = None

    def register_idle_function(self, function, data):
        pass

    def prepare_cooker(self):
        sys.stderr.write("Parsing recipes..")
        logger.setLevel(logging.WARNING)

        try:
            while self.cooker.state in (state.initial, state.parsing):
                self.cooker.updateCache()
        except KeyboardInterrupt:
            self.cooker.shutdown()
            self.cooker.updateCache()
            sys.exit(2)

        logger.setLevel(logging.INFO)
        sys.stderr.write("done.\n")

        self.cooker_data = self.cooker.status
        self.cooker_data.appends = self.cooker.appendlist

    def check_prepare_cooker(self):
        if not self.cooker_data:
            self.prepare_cooker()

    def default(self, line):
        """Handle unrecognised commands"""
        sys.stderr.write("Unrecognised command or option\n")
        self.do_help('')

    def do_help(self, topic):
        """display general help or help on a specified command"""
        if topic:
            sys.stdout.write('%s: ' % topic)
            cmd.Cmd.do_help(self,topic)
        else:
            sys.stdout.write("usage: bitbake-layers <command> [arguments]\n\n")
            sys.stdout.write("Available commands:\n")
            procnames = self.get_names()
            for procname in procnames:
                if procname[:3] == 'do_':
                    sys.stdout.write("  %s\n" % procname[3:])
                    doc = getattr(self, procname).__doc__
                    if doc:
                        sys.stdout.write("    %s\n" % doc.splitlines()[0])

    def do_show_layers(self, args):
        """show current configured layers"""
        self.check_prepare_cooker()
        logger.plain('')
        logger.plain("%s  %s  %s" % ("layer".ljust(20), "path".ljust(40), "priority"))
        logger.plain('=' * 74)
        layerdirs = str(self.config_data.getVar('BBLAYERS', True)).split()
        for layerdir in layerdirs:
            layername = '?'
            layerpri = 0
            for layer, _, regex, pri in self.cooker.status.bbfile_config_priorities:
                if regex.match(os.path.join(layerdir, 'test')):
                    layername = layer
                    layerpri = pri
                    break

            logger.plain("%s  %s  %d" % (layername.ljust(20), layerdir.ljust(40), layerpri))

    def do_show_overlayed(self, args):
        """list overlayed recipes (where there is a recipe in another layer that has a higher layer priority)

usage: show_overlayed

Highest priority recipes are listed with the recipes they overlay as subitems.
"""
        self.check_prepare_cooker()
        if self.cooker.overlayed:
            logger.plain('Overlayed recipes:')
            for f in self.cooker.overlayed.iterkeys():
                logger.plain('%s' % f)
                for of in self.cooker.overlayed[f]:
                    logger.plain('  %s' % of)
        else:
            logger.plain('No overlayed recipes found')

    def do_flatten(self, args):
        """flattens layer configuration into a separate output directory.

usage: flatten [layer1 layer2 [layer3]...] <outputdir>

Takes the specified layers (or all layers in the current layer
configuration if none are specified) and builds a "flattened" directory
containing the contents of all layers, with any overlayed recipes removed
and bbappends appended to the corresponding recipes. Note that some manual
cleanup may still be necessary afterwards, in particular:

* where non-recipe files (such as patches) are overwritten (the flatten
  command will show a warning for these)
* where anything beyond the normal layer setup has been added to
  layer.conf (only the lowest priority number layer's layer.conf is used)
* overridden/appended items from bbappends will need to be tidied up
* when the flattened layers do not have the same directory structure (the
  flatten command should show a warning when this will cause a problem)

Warning: if you flatten several layers where another layer is intended to
be used "inbetween" them (in layer priority order) such that recipes /
bbappends in the layers interact, and then attempt to use the new output
layer together with that other layer, you may no longer get the same
build results (as the layer priority order has effectively changed).
"""
        arglist = args.split()
        if len(arglist) < 1:
            logger.error('Please specify an output directory')
            self.do_help('flatten')
            return

        if len(arglist) == 2:
            logger.error('If you specify layers to flatten you must specify at least two')
            self.do_help('flatten')
            return

        outputdir = arglist[-1]
        if os.path.exists(outputdir) and os.listdir(outputdir):
            logger.error('Directory %s exists and is non-empty, please clear it out first' % outputdir)
            return

        self.check_prepare_cooker()
        layers = (self.config_data.getVar('BBLAYERS', True) or "").split()
        if len(arglist) > 2:
            layernames = arglist[:-1]
            found_layernames = []
            found_layerdirs = []
            for layerdir in layers:
                for layername, _, regex, _ in self.cooker.status.bbfile_config_priorities:
                    if layername in layernames:
                        if regex.match(os.path.join(layerdir, 'test')):
                            found_layerdirs.append(layerdir)
                            found_layernames.append(layername)
                            break

            for layername in layernames:
                if not layername in found_layernames:
                    logger.error('Unable to find layer %s in current configuration, please run "%s show_layers" to list configured layers' % (layername, os.path.basename(sys.argv[0])))
                    return
            layers = found_layerdirs
        else:
            layernames = []

        # Ensure a specified path matches our list of layers
        def layer_path_match(path):
            for layerdir in layers:
                if path.startswith(os.path.join(layerdir, '')):
                    return layerdir
            return None

        appended_recipes = []
        for layer in layers:
            overlayed = []
            for f in self.cooker.overlayed.iterkeys():
                for of in self.cooker.overlayed[f]:
                    if of.startswith(layer):
                        overlayed.append(of)

            logger.plain('Copying files from %s...' % layer )
            for root, dirs, files in os.walk(layer):
                for f1 in files:
                    f1full = os.sep.join([root, f1])
                    if f1full in overlayed:
                        logger.plain('  Skipping overlayed file %s' % f1full )
                    else:
                        ext = os.path.splitext(f1)[1]
                        if ext != '.bbappend':
                            fdest = f1full[len(layer):]
                            fdest = os.path.normpath(os.sep.join([outputdir,fdest]))
                            bb.utils.mkdirhier(os.path.dirname(fdest))
                            if os.path.exists(fdest):
                                if f1 == 'layer.conf' and root.endswith('/conf'):
                                    logger.plain('  Skipping layer config file %s' % f1full )
                                    continue
                                else:
                                    logger.warn('Overwriting file %s', fdest)
                            bb.utils.copyfile(f1full, fdest)
                            if ext == '.bb':
                                if f1 in self.cooker_data.appends:
                                    appends = self.cooker_data.appends[f1]
                                    if appends:
                                        logger.plain('  Applying appends to %s' % fdest )
                                        for appendname in appends:
                                            if layer_path_match(appendname):
                                                self.apply_append(appendname, fdest)
                                    appended_recipes.append(f1)

        # Take care of when some layers are excluded and yet we have included bbappends for those recipes
        for recipename in self.cooker_data.appends.iterkeys():
            if recipename not in appended_recipes:
                appends = self.cooker_data.appends[recipename]
                first_append = None
                for appendname in appends:
                    layer = layer_path_match(appendname)
                    if layer:
                        if first_append:
                            self.apply_append(appendname, first_append)
                        else:
                            fdest = appendname[len(layer):]
                            fdest = os.path.normpath(os.sep.join([outputdir,fdest]))
                            bb.utils.mkdirhier(os.path.dirname(fdest))
                            bb.utils.copyfile(appendname, fdest)
                            first_append = fdest

        # Get the regex for the first layer in our list (which is where the conf/layer.conf file will
        # have come from)
        first_regex = None
        layerdir = layers[0]
        for layername, pattern, regex, _ in self.cooker.status.bbfile_config_priorities:
            if (not layernames) or layername in layernames:
                if regex.match(os.path.join(layerdir, 'test')):
                    first_regex = regex
                    break

        if first_regex:
            # Find the BBFILES entries that match (which will have come from this conf/layer.conf file)
            bbfiles = str(self.config_data.getVar('BBFILES', True)).split()
            bbfiles_layer = []
            for item in bbfiles:
                if first_regex.match(item):
                    newpath = os.path.join(outputdir, item[len(layerdir)+1:])
                    bbfiles_layer.append(newpath)

            if bbfiles_layer:
                # Check that all important layer files match BBFILES
                for root, dirs, files in os.walk(outputdir):
                    for f1 in files:
                        ext = os.path.splitext(f1)[1]
                        if ext in ['.bb', '.bbappend']:
                            f1full = os.sep.join([root, f1])
                            entry_found = False
                            for item in bbfiles_layer:
                                if fnmatch.fnmatch(f1full, item):
                                    entry_found = True
                                    break
                            if not entry_found:
                                logger.warning("File %s does not match the flattened layer's BBFILES setting, you may need to edit conf/layer.conf or move the file elsewhere" % f1full)

    def get_append_layer(self, appendname):
        for layer, _, regex, _ in self.cooker.status.bbfile_config_priorities:
            if regex.match(appendname):
                return layer
        return "?"

    def apply_append(self, appendname, recipename):
        appendfile = open(appendname, 'r')
        recipefile = open(recipename, 'a')
        recipefile.write('\n')
        recipefile.write('##### bbappended from %s #####\n' % self.get_append_layer(appendname))
        recipefile.writelines(appendfile.readlines())
        recipefile.close()
        appendfile.close()

    def do_show_appends(self, args):
        """list bbappend files and recipe files they apply to

usage: show_appends

Recipes are listed with the bbappends that apply to them as subitems.
"""
        self.check_prepare_cooker()
        if not self.cooker_data.appends:
            logger.plain('No append files found')
            return

        logger.plain('State of append files:')

        pnlist = list(self.cooker_data.pkg_pn.keys())
        pnlist.sort()
        for pn in pnlist:
            self.show_appends_for_pn(pn)

        self.show_appends_for_skipped()

    def show_appends_for_pn(self, pn):
        filenames = self.cooker_data.pkg_pn[pn]

        best = bb.providers.findBestProvider(pn,
                                             self.cooker.configuration.data,
                                             self.cooker_data,
                                             self.cooker_data.pkg_pn)
        best_filename = os.path.basename(best[3])

        self.show_appends_output(filenames, best_filename)

    def show_appends_for_skipped(self):
        filenames = [os.path.basename(f)
                    for f in self.cooker.skiplist.iterkeys()]
        self.show_appends_output(filenames, None, " (skipped)")

    def show_appends_output(self, filenames, best_filename, name_suffix = ''):
        appended, missing = self.get_appends_for_files(filenames)
        if appended:
            for basename, appends in appended:
                logger.plain('%s%s:', basename, name_suffix)
                for append in appends:
                    logger.plain('  %s', append)

            if best_filename:
                if best_filename in missing:
                    logger.warn('%s: missing append for preferred version',
                                best_filename)
                    self.returncode |= 1


    def get_appends_for_files(self, filenames):
        appended, notappended = [], []
        for filename in filenames:
            _, cls = bb.cache.Cache.virtualfn2realfn(filename)
            if cls:
                continue

            basename = os.path.basename(filename)
            appends = self.cooker_data.appends.get(basename)
            if appends:
                appended.append((basename, list(appends)))
            else:
                notappended.append(basename)
        return appended, notappended


class Config(object):
    def __init__(self, **options):
        self.pkgs_to_build = []
        self.debug_domains = []
        self.extra_assume_provided = []
        self.prefile = []
        self.postfile = []
        self.debug = 0
        self.__dict__.update(options)

    def __getattr__(self, attribute):
        try:
            return super(Config, self).__getattribute__(attribute)
        except AttributeError:
            return None


if __name__ == '__main__':
    sys.exit(main(sys.argv[1:]) or 0)