#!/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

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


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 <outputdir>

Takes the current layer configuration 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 layer's layer.conf is used)
* overridden/appended items from bbappends will need to be tidied up
"""
        arglist = args.split()
        if len(arglist) != 1:
            logger.error('Please specify an output directory')
            self.do_help('flatten')
            return

        if os.path.exists(arglist[0]) and os.listdir(arglist[0]):
            logger.error('Directory %s exists and is non-empty, please clear it out first' % arglist[0])
            return

        self.check_prepare_cooker()
        layers = (self.config_data.getVar('BBLAYERS', True) or "").split()
        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([arglist[0],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:
                                            self.apply_append(appendname, fdest)

    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())

    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)