"""
BitBake 'Command' module

Provide an interface to interact with the bitbake server through 'commands'
"""

# Copyright (C) 2006-2007  Richard Purdie
#
# 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.

"""
The bitbake server takes 'commands' from its UI/commandline.
Commands are either synchronous or asynchronous.
Async commands return data to the client in the form of events.
Sync commands must only return data through the function return value
and must not trigger events, directly or indirectly.
Commands are queued in a CommandQueue
"""

from collections import OrderedDict, defaultdict

import bb.event
import bb.cooker
import bb.remotedata

class DataStoreConnectionHandle(object):
    def __init__(self, dsindex=0):
        self.dsindex = dsindex

class CommandCompleted(bb.event.Event):
    pass

class CommandExit(bb.event.Event):
    def  __init__(self, exitcode):
        bb.event.Event.__init__(self)
        self.exitcode = int(exitcode)

class CommandFailed(CommandExit):
    def __init__(self, message):
        self.error = message
        CommandExit.__init__(self, 1)
    def __str__(self):
        return "Command execution failed: %s" % self.error

class CommandError(Exception):
    pass

class Command:
    """
    A queue of asynchronous commands for bitbake
    """
    def __init__(self, cooker):
        self.cooker = cooker
        self.cmds_sync = CommandsSync()
        self.cmds_async = CommandsAsync()
        self.remotedatastores = bb.remotedata.RemoteDatastores(cooker)

        # FIXME Add lock for this
        self.currentAsyncCommand = None

    def runCommand(self, commandline, ro_only = False):
        command = commandline.pop(0)
        if hasattr(CommandsSync, command):
            # Can run synchronous commands straight away
            command_method = getattr(self.cmds_sync, command)
            if ro_only:
                if not hasattr(command_method, 'readonly') or False == getattr(command_method, 'readonly'):
                    return None, "Not able to execute not readonly commands in readonly mode"
            try:
                self.cooker.process_inotify_updates()
                if getattr(command_method, 'needconfig', True):
                    self.cooker.updateCacheSync()
                result = command_method(self, commandline)
            except CommandError as exc:
                return None, exc.args[0]
            except (Exception, SystemExit):
                import traceback
                return None, traceback.format_exc()
            else:
                return result, None
        if self.currentAsyncCommand is not None:
            return None, "Busy (%s in progress)" % self.currentAsyncCommand[0]
        if command not in CommandsAsync.__dict__:
            return None, "No such command"
        self.currentAsyncCommand = (command, commandline)
        self.cooker.configuration.server_register_idlecallback(self.cooker.runCommands, self.cooker)
        return True, None

    def runAsyncCommand(self):
        try:
            self.cooker.process_inotify_updates()
            if self.cooker.state in (bb.cooker.state.error, bb.cooker.state.shutdown, bb.cooker.state.forceshutdown):
                # updateCache will trigger a shutdown of the parser
                # and then raise BBHandledException triggering an exit
                self.cooker.updateCache()
                return False
            if self.currentAsyncCommand is not None:
                (command, options) = self.currentAsyncCommand
                commandmethod = getattr(CommandsAsync, command)
                needcache = getattr( commandmethod, "needcache" )
                if needcache and self.cooker.state != bb.cooker.state.running:
                    self.cooker.updateCache()
                    return True
                else:
                    commandmethod(self.cmds_async, self, options)
                    return False
            else:
                return False
        except KeyboardInterrupt as exc:
            self.finishAsyncCommand("Interrupted")
            return False
        except SystemExit as exc:
            arg = exc.args[0]
            if isinstance(arg, str):
                self.finishAsyncCommand(arg)
            else:
                self.finishAsyncCommand("Exited with %s" % arg)
            return False
        except Exception as exc:
            import traceback
            if isinstance(exc, bb.BBHandledException):
                self.finishAsyncCommand("")
            else:
                self.finishAsyncCommand(traceback.format_exc())
            return False

    def finishAsyncCommand(self, msg=None, code=None):
        if msg or msg == "":
            bb.event.fire(CommandFailed(msg), self.cooker.data)
        elif code:
            bb.event.fire(CommandExit(code), self.cooker.data)
        else:
            bb.event.fire(CommandCompleted(), self.cooker.data)
        self.currentAsyncCommand = None
        self.cooker.finishcommand()

    def reset(self):
        self.remotedatastores = bb.remotedata.RemoteDatastores(self.cooker)

def split_mc_pn(pn):
    if pn.startswith("multiconfig:"):
        _, mc, pn = pn.split(":", 2)
        return (mc, pn)
    return ('', pn)

class CommandsSync:
    """
    A class of synchronous commands
    These should run quickly so as not to hurt interactive performance.
    These must not influence any running synchronous command.
    """

    def stateShutdown(self, command, params):
        """
        Trigger cooker 'shutdown' mode
        """
        command.cooker.shutdown(False)

    def stateForceShutdown(self, command, params):
        """
        Stop the cooker
        """
        command.cooker.shutdown(True)

    def getAllKeysWithFlags(self, command, params):
        """
        Returns a dump of the global state. Call with
        variable flags to be retrieved as params.
        """
        flaglist = params[0]
        return command.cooker.getAllKeysWithFlags(flaglist)
    getAllKeysWithFlags.readonly = True

    def getVariable(self, command, params):
        """
        Read the value of a variable from data
        """
        varname = params[0]
        expand = True
        if len(params) > 1:
            expand = (params[1] == "True")

        return command.cooker.data.getVar(varname, expand)
    getVariable.readonly = True

    def setVariable(self, command, params):
        """
        Set the value of variable in data
        """
        varname = params[0]
        value = str(params[1])
        command.cooker.extraconfigdata[varname] = value
        command.cooker.data.setVar(varname, value)

    def getSetVariable(self, command, params):
        """
        Read the value of a variable from data and set it into the datastore
        which effectively expands and locks the value.
        """
        varname = params[0]
        result = self.getVariable(command, params)
        command.cooker.data.setVar(varname, result)
        return result

    def setConfig(self, command, params):
        """
        Set the value of variable in configuration
        """
        varname = params[0]
        value = str(params[1])
        setattr(command.cooker.configuration, varname, value)

    def enableDataTracking(self, command, params):
        """
        Enable history tracking for variables
        """
        command.cooker.enableDataTracking()

    def disableDataTracking(self, command, params):
        """
        Disable history tracking for variables
        """
        command.cooker.disableDataTracking()

    def setPrePostConfFiles(self, command, params):
        prefiles = params[0].split()
        postfiles = params[1].split()
        command.cooker.configuration.prefile = prefiles
        command.cooker.configuration.postfile = postfiles
    setPrePostConfFiles.needconfig = False

    def matchFile(self, command, params):
        fMatch = params[0]
        return command.cooker.matchFile(fMatch)
    matchFile.needconfig = False

    def getUIHandlerNum(self, command, params):
        return bb.event.get_uihandler()
    getUIHandlerNum.needconfig = False
    getUIHandlerNum.readonly = True

    def setEventMask(self, command, params):
        handlerNum = params[0]
        llevel = params[1]
        debug_domains = params[2]
        mask = params[3]
        return bb.event.set_UIHmask(handlerNum, llevel, debug_domains, mask)
    setEventMask.needconfig = False
    setEventMask.readonly = True

    def setFeatures(self, command, params):
        """
        Set the cooker features to include the passed list of features
        """
        features = params[0]
        command.cooker.setFeatures(features)
    setFeatures.needconfig = False
    # although we change the internal state of the cooker, this is transparent since
    # we always take and leave the cooker in state.initial
    setFeatures.readonly = True

    def updateConfig(self, command, params):
        options = params[0]
        environment = params[1]
        cmdline = params[2]
        command.cooker.updateConfigOpts(options, environment, cmdline)
    updateConfig.needconfig = False

    def parseConfiguration(self, command, params):
        """Instruct bitbake to parse its configuration
        NOTE: it is only necessary to call this if you aren't calling any normal action
        (otherwise parsing is taken care of automatically)
        """
        command.cooker.parseConfiguration()
    parseConfiguration.needconfig = False

    def getLayerPriorities(self, command, params):
        command.cooker.parseConfiguration()
        ret = []
        # regex objects cannot be marshalled by xmlrpc
        for collection, pattern, regex, pri in command.cooker.bbfile_config_priorities:
            ret.append((collection, pattern, regex.pattern, pri))
        return ret
    getLayerPriorities.readonly = True

    def getRecipes(self, command, params):
        try:
            mc = params[0]
        except IndexError:
            mc = ''
        return list(command.cooker.recipecaches[mc].pkg_pn.items())
    getRecipes.readonly = True

    def getRecipeDepends(self, command, params):
        try:
            mc = params[0]
        except IndexError:
            mc = ''
        return list(command.cooker.recipecaches[mc].deps.items())
    getRecipeDepends.readonly = True

    def getRecipeVersions(self, command, params):
        try:
            mc = params[0]
        except IndexError:
            mc = ''
        return command.cooker.recipecaches[mc].pkg_pepvpr
    getRecipeVersions.readonly = True

    def getRecipeProvides(self, command, params):
        try:
            mc = params[0]
        except IndexError:
            mc = ''
        return command.cooker.recipecaches[mc].fn_provides
    getRecipeProvides.readonly = True

    def getRecipePackages(self, command, params):
        try:
            mc = params[0]
        except IndexError:
            mc = ''
        return command.cooker.recipecaches[mc].packages
    getRecipePackages.readonly = True

    def getRecipePackagesDynamic(self, command, params):
        try:
            mc = params[0]
        except IndexError:
            mc = ''
        return command.cooker.recipecaches[mc].packages_dynamic
    getRecipePackagesDynamic.readonly = True

    def getRProviders(self, command, params):
        try:
            mc = params[0]
        except IndexError:
            mc = ''
        return command.cooker.recipecaches[mc].rproviders
    getRProviders.readonly = True

    def getRuntimeDepends(self, command, params):
        ret = []
        try:
            mc = params[0]
        except IndexError:
            mc = ''
        rundeps = command.cooker.recipecaches[mc].rundeps
        for key, value in rundeps.items():
            if isinstance(value, defaultdict):
                value = dict(value)
            ret.append((key, value))
        return ret
    getRuntimeDepends.readonly = True

    def getRuntimeRecommends(self, command, params):
        ret = []
        try:
            mc = params[0]
        except IndexError:
            mc = ''
        runrecs = command.cooker.recipecaches[mc].runrecs
        for key, value in runrecs.items():
            if isinstance(value, defaultdict):
                value = dict(value)
            ret.append((key, value))
        return ret
    getRuntimeRecommends.readonly = True

    def getRecipeInherits(self, command, params):
        try:
            mc = params[0]
        except IndexError:
            mc = ''
        return command.cooker.recipecaches[mc].inherits
    getRecipeInherits.readonly = True

    def getBbFilePriority(self, command, params):
        try:
            mc = params[0]
        except IndexError:
            mc = ''
        return command.cooker.recipecaches[mc].bbfile_priority
    getBbFilePriority.readonly = True

    def getDefaultPreference(self, command, params):
        try:
            mc = params[0]
        except IndexError:
            mc = ''
        return command.cooker.recipecaches[mc].pkg_dp
    getDefaultPreference.readonly = True

    def getSkippedRecipes(self, command, params):
        # Return list sorted by reverse priority order
        import bb.cache
        skipdict = OrderedDict(sorted(command.cooker.skiplist.items(),
                                      key=lambda x: (-command.cooker.collection.calc_bbfile_priority(bb.cache.virtualfn2realfn(x[0])[0]), x[0])))
        return list(skipdict.items())
    getSkippedRecipes.readonly = True

    def getOverlayedRecipes(self, command, params):
        return list(command.cooker.collection.overlayed.items())
    getOverlayedRecipes.readonly = True

    def getFileAppends(self, command, params):
        fn = params[0]
        return command.cooker.collection.get_file_appends(fn)
    getFileAppends.readonly = True

    def getAllAppends(self, command, params):
        return command.cooker.collection.bbappends
    getAllAppends.readonly = True

    def findProviders(self, command, params):
        return command.cooker.findProviders()
    findProviders.readonly = True

    def findBestProvider(self, command, params):
        (mc, pn) = split_mc_pn(params[0])
        return command.cooker.findBestProvider(pn, mc)
    findBestProvider.readonly = True

    def allProviders(self, command, params):
        try:
            mc = params[0]
        except IndexError:
            mc = ''
        return list(bb.providers.allProviders(command.cooker.recipecaches[mc]).items())
    allProviders.readonly = True

    def getRuntimeProviders(self, command, params):
        rprovide = params[0]
        try:
            mc = params[1]
        except IndexError:
            mc = ''
        all_p = bb.providers.getRuntimeProviders(command.cooker.recipecaches[mc], rprovide)
        if all_p:
            best = bb.providers.filterProvidersRunTime(all_p, rprovide,
                            command.cooker.data,
                            command.cooker.recipecaches[mc])[0][0]
        else:
            best = None
        return all_p, best
    getRuntimeProviders.readonly = True

    def dataStoreConnectorFindVar(self, command, params):
        dsindex = params[0]
        name = params[1]
        datastore = command.remotedatastores[dsindex]
        value, overridedata = datastore._findVar(name)

        if value:
            content = value.get('_content', None)
            if isinstance(content, bb.data_smart.DataSmart):
                # Value is a datastore (e.g. BB_ORIGENV) - need to handle this carefully
                idx = command.remotedatastores.check_store(content, True)
                return {'_content': DataStoreConnectionHandle(idx),
                        '_connector_origtype': 'DataStoreConnectionHandle',
                        '_connector_overrides': overridedata}
            elif isinstance(content, set):
                return {'_content': list(content),
                        '_connector_origtype': 'set',
                        '_connector_overrides': overridedata}
            else:
                value['_connector_overrides'] = overridedata
        else:
            value = {}
            value['_connector_overrides'] = overridedata
        return value
    dataStoreConnectorFindVar.readonly = True

    def dataStoreConnectorGetKeys(self, command, params):
        dsindex = params[0]
        datastore = command.remotedatastores[dsindex]
        return list(datastore.keys())
    dataStoreConnectorGetKeys.readonly = True

    def dataStoreConnectorGetVarHistory(self, command, params):
        dsindex = params[0]
        name = params[1]
        datastore = command.remotedatastores[dsindex]
        return datastore.varhistory.variable(name)
    dataStoreConnectorGetVarHistory.readonly = True

    def dataStoreConnectorExpandPythonRef(self, command, params):
        config_data_dict = params[0]
        varname = params[1]
        expr = params[2]

        config_data = command.remotedatastores.receive_datastore(config_data_dict)

        varparse = bb.data_smart.VariableParse(varname, config_data)
        return varparse.python_sub(expr)

    def dataStoreConnectorRelease(self, command, params):
        dsindex = params[0]
        if dsindex <= 0:
            raise CommandError('dataStoreConnectorRelease: invalid index %d' % dsindex)
        command.remotedatastores.release(dsindex)

    def dataStoreConnectorSetVarFlag(self, command, params):
        dsindex = params[0]
        name = params[1]
        flag = params[2]
        value = params[3]
        datastore = command.remotedatastores[dsindex]
        datastore.setVarFlag(name, flag, value)

    def dataStoreConnectorDelVar(self, command, params):
        dsindex = params[0]
        name = params[1]
        datastore = command.remotedatastores[dsindex]
        if len(params) > 2:
            flag = params[2]
            datastore.delVarFlag(name, flag)
        else:
            datastore.delVar(name)

    def dataStoreConnectorRenameVar(self, command, params):
        dsindex = params[0]
        name = params[1]
        newname = params[2]
        datastore = command.remotedatastores[dsindex]
        datastore.renameVar(name, newname)

    def parseRecipeFile(self, command, params):
        """
        Parse the specified recipe file (with or without bbappends)
        and return a datastore object representing the environment
        for the recipe.
        """
        fn = params[0]
        appends = params[1]
        appendlist = params[2]
        if len(params) > 3:
            config_data_dict = params[3]
            config_data = command.remotedatastores.receive_datastore(config_data_dict)
        else:
            config_data = None

        if appends:
            if appendlist is not None:
                appendfiles = appendlist
            else:
                appendfiles = command.cooker.collection.get_file_appends(fn)
        else:
            appendfiles = []
        # We are calling bb.cache locally here rather than on the server,
        # but that's OK because it doesn't actually need anything from
        # the server barring the global datastore (which we have a remote
        # version of)
        if config_data:
            # We have to use a different function here if we're passing in a datastore
            # NOTE: we took a copy above, so we don't do it here again
            envdata = bb.cache.parse_recipe(config_data, fn, appendfiles)['']
        else:
            # Use the standard path
            parser = bb.cache.NoCache(command.cooker.databuilder)
            envdata = parser.loadDataFull(fn, appendfiles)
        idx = command.remotedatastores.store(envdata)
        return DataStoreConnectionHandle(idx)
    parseRecipeFile.readonly = True

class CommandsAsync:
    """
    A class of asynchronous commands
    These functions communicate via generated events.
    Any function that requires metadata parsing should be here.
    """

    def buildFile(self, command, params):
        """
        Build a single specified .bb file
        """
        bfile = params[0]
        task = params[1]
        if len(params) > 2:
            internal = params[2]
        else:
            internal = False

        if internal:
            command.cooker.buildFileInternal(bfile, task, fireevents=False, quietlog=True)
        else:
            command.cooker.buildFile(bfile, task)
    buildFile.needcache = False

    def buildTargets(self, command, params):
        """
        Build a set of targets
        """
        pkgs_to_build = params[0]
        task = params[1]

        command.cooker.buildTargets(pkgs_to_build, task)
    buildTargets.needcache = True

    def generateDepTreeEvent(self, command, params):
        """
        Generate an event containing the dependency information
        """
        pkgs_to_build = params[0]
        task = params[1]

        command.cooker.generateDepTreeEvent(pkgs_to_build, task)
        command.finishAsyncCommand()
    generateDepTreeEvent.needcache = True

    def generateDotGraph(self, command, params):
        """
        Dump dependency information to disk as .dot files
        """
        pkgs_to_build = params[0]
        task = params[1]

        command.cooker.generateDotGraphFiles(pkgs_to_build, task)
        command.finishAsyncCommand()
    generateDotGraph.needcache = True

    def generateTargetsTree(self, command, params):
        """
        Generate a tree of buildable targets.
        If klass is provided ensure all recipes that inherit the class are
        included in the package list.
        If pkg_list provided use that list (plus any extras brought in by
        klass) rather than generating a tree for all packages.
        """
        klass = params[0]
        pkg_list = params[1]

        command.cooker.generateTargetsTree(klass, pkg_list)
        command.finishAsyncCommand()
    generateTargetsTree.needcache = True

    def findConfigFiles(self, command, params):
        """
        Find config files which provide appropriate values
        for the passed configuration variable. i.e. MACHINE
        """
        varname = params[0]

        command.cooker.findConfigFiles(varname)
        command.finishAsyncCommand()
    findConfigFiles.needcache = False

    def findFilesMatchingInDir(self, command, params):
        """
        Find implementation files matching the specified pattern
        in the requested subdirectory of a BBPATH
        """
        pattern = params[0]
        directory = params[1]

        command.cooker.findFilesMatchingInDir(pattern, directory)
        command.finishAsyncCommand()
    findFilesMatchingInDir.needcache = False

    def findConfigFilePath(self, command, params):
        """
        Find the path of the requested configuration file
        """
        configfile = params[0]

        command.cooker.findConfigFilePath(configfile)
        command.finishAsyncCommand()
    findConfigFilePath.needcache = False

    def showVersions(self, command, params):
        """
        Show the currently selected versions
        """
        command.cooker.showVersions()
        command.finishAsyncCommand()
    showVersions.needcache = True

    def showEnvironmentTarget(self, command, params):
        """
        Print the environment of a target recipe
        (needs the cache to work out which recipe to use)
        """
        pkg = params[0]

        command.cooker.showEnvironment(None, pkg)
        command.finishAsyncCommand()
    showEnvironmentTarget.needcache = True

    def showEnvironment(self, command, params):
        """
        Print the standard environment
        or if specified the environment for a specified recipe
        """
        bfile = params[0]

        command.cooker.showEnvironment(bfile)
        command.finishAsyncCommand()
    showEnvironment.needcache = False

    def parseFiles(self, command, params):
        """
        Parse the .bb files
        """
        command.cooker.updateCache()
        command.finishAsyncCommand()
    parseFiles.needcache = True

    def compareRevisions(self, command, params):
        """
        Parse the .bb files
        """
        if bb.fetch.fetcher_compare_revisions(command.cooker.data):
            command.finishAsyncCommand(code=1)
        else:
            command.finishAsyncCommand()
    compareRevisions.needcache = True

    def triggerEvent(self, command, params):
        """
        Trigger a certain event
        """
        event = params[0]
        bb.event.fire(eval(event), command.cooker.data)
        command.currentAsyncCommand = None
    triggerEvent.needcache = False

    def resetCooker(self, command, params):
        """
        Reset the cooker to its initial state, thus forcing a reparse for
        any async command that has the needcache property set to True
        """
        command.cooker.reset()
        command.finishAsyncCommand()
    resetCooker.needcache = False

    def clientComplete(self, command, params):
        """
        Do the right thing when the controlling client exits
        """
        command.cooker.clientComplete()
        command.finishAsyncCommand()
    clientComplete.needcache = False

    def findSigInfo(self, command, params):
        """
        Find signature info files via the signature generator
        """
        pn = params[0]
        taskname = params[1]
        sigs = params[2]
        res = bb.siggen.find_siginfo(pn, taskname, sigs, command.cooker.data)
        bb.event.fire(bb.event.FindSigInfoResult(res), command.cooker.data)
        command.finishAsyncCommand()
    findSigInfo.needcache = False