"""
Frame is the Client Framework that verifies and
installs entries, and generates statistics.
"""
__revision__ = '$Revision$'

import logging
import sys
import time
import Bcfg2.Client.Tools


def cmpent(ent1, ent2):
    """Sort entries."""
    if ent1.tag != ent2.tag:
        return cmp(ent1.tag, ent2.tag)
    else:
        return cmp(ent1.get('name'), ent2.get('name'))


def promptFilter(prompt, entries):
    """Filter a supplied list based on user input."""
    ret = []
    entries.sort(cmpent)
    for entry in entries[:]:
        if 'qtext' in entry.attrib:
            iprompt = entry.get('qtext')
        else:
            iprompt = prompt % (entry.tag, entry.get('name'))
        try:
            # py3k compatibility
            try:
                ans = raw_input(iprompt.encode(sys.stdout.encoding, 'replace'))
            except NameError:
                ans = input(iprompt)
            if ans in ['y', 'Y']:
                ret.append(entry)
        except EOFError:
            # python 2.4.3 on CentOS doesn't like ^C for some reason
            break
        except:
            print("Error while reading input")
            continue
    return ret


def matches_entry(entryspec, entry):
    # both are (tag, name)
    if entryspec == entry:
        return True
    else:
        for i in [0, 1]:
            if entryspec[i] == entry[i]:
                continue
            elif entryspec[i] == '*':
                continue
            elif '*' in entryspec[i]:
                starpt = entryspec[i].index('*')
                if entry[i].startswith(entryspec[i][:starpt]):
                    continue
            return False
        return True


def matches_white_list(entry, whitelist):
    return True in [matches_entry(we, (entry.tag, entry.get('name')))
                    for we in whitelist]


def passes_black_list(entry, blacklist):
    return True not in [matches_entry(be, (entry.tag, entry.get('name')))
                        for be in blacklist]


class Frame:
    """Frame is the container for all Tool objects and state information."""
    def __init__(self, config, setup, times, drivers, dryrun):
        self.config = config
        self.times = times
        self.dryrun = dryrun
        self.times['initialization'] = time.time()
        self.setup = setup
        self.tools = []
        self.states = {}
        self.whitelist = []
        self.blacklist = []
        self.removal = []
        self.logger = logging.getLogger("Bcfg2.Client.Frame")
        for driver in drivers[:]:
            if driver not in Bcfg2.Client.Tools.drivers and \
                   isinstance(driver, str):
                self.logger.error("Tool driver %s is not available" % driver)
                drivers.remove(driver)

        tclass = {}
        for tool in drivers:
            if not isinstance(tool, str):
                tclass[time.time()] = tool
            tool_class = "Bcfg2.Client.Tools.%s" % tool
            try:
                tclass[tool] = getattr(__import__(tool_class, globals(),
                                                  locals(), ['*']),
                                       tool)
            except ImportError:
                continue
            except:
                self.logger.error("Tool %s unexpectedly failed to load" % tool,
                                  exc_info=1)

        for tool in list(tclass.values()):
            try:
                self.tools.append(tool(self.logger, setup, config))
            except Bcfg2.Client.Tools.toolInstantiationError:
                continue
            except:
                self.logger.error("Failed to instantiate tool %s" % \
                                  (tool), exc_info=1)

        for tool in self.tools[:]:
            for conflict in getattr(tool, 'conflicts', []):
                [self.tools.remove(item) for item in self.tools \
                 if item.name == conflict]

        self.logger.info("Loaded tool drivers:")
        self.logger.info([tool.name for tool in self.tools])

        # find entries not handled by any tools
        problems = [entry for struct in config for \
                    entry in struct if entry not in self.handled]

        if problems:
            self.logger.error("The following entries are not handled by any tool:")
            self.logger.error(["%s:%s:%s" % (entry.tag, entry.get('type'), \
                                             entry.get('name')) for entry in problems])
            self.logger.error("")
        entries = [(entry.tag, entry.get('name'))
                   for struct in config for entry in struct]
        pkgs = [(entry.get('name'), entry.get('origin'))
                for struct in config for entry in struct if entry.tag == 'Package']
        multi = []
        for entry in entries[:]:
            if entries.count(entry) > 1:
                multi.append(entry)
                entries.remove(entry)
        if multi:
            self.logger.debug("The following entries are included multiple times:")
            self.logger.debug(["%s:%s" % entry for entry in multi])
            self.logger.debug("")
        if pkgs:
            self.logger.debug("The following packages are specified in bcfg2:")
            self.logger.debug([pkg[0] for pkg in pkgs if pkg[1] == None])
            self.logger.debug("The following packages are prereqs added by Packages:")
            self.logger.debug([pkg[0] for pkg in pkgs if pkg[1] == 'Packages'])

    def __getattr__(self, name):
        if name in ['extra', 'handled', 'modified', '__important__']:
            ret = []
            for tool in self.tools:
                ret += getattr(tool, name)
            return ret
        elif name in self.__dict__:
            return self.__dict__[name]
        raise AttributeError(name)

    def InstallImportant(self):
        """Install important entries

        We also process the decision mode stuff here because we want to prevent
        non-whitelisted/blacklisted 'important' entries from being installed
        prior to determining the decision mode on the client.
        """
        # Need to process decision stuff early so that dryrun mode works with it
        self.whitelist = [entry for entry in self.states \
                          if not self.states[entry]]
        if not self.setup['file']:
            if self.setup['decision'] == 'whitelist':
                dwl = self.setup['decision_list']
                w_to_rem = [e for e in self.whitelist \
                            if not matches_white_list(e, dwl)]
                if w_to_rem:
                    self.logger.info("In whitelist mode: suppressing installation of:")
                    self.logger.info(["%s:%s" % (e.tag, e.get('name')) for e in w_to_rem])
                    self.whitelist = [x for x in self.whitelist \
                                      if x not in w_to_rem]
            elif self.setup['decision'] == 'blacklist':
                b_to_rem = [e for e in self.whitelist \
                            if not passes_black_list(e, self.setup['decision_list'])]
                if b_to_rem:
                    self.logger.info("In blacklist mode: suppressing installation of:")
                    self.logger.info(["%s:%s" % (e.tag, e.get('name')) for e in b_to_rem])
                    self.whitelist = [x for x in self.whitelist if x not in b_to_rem]

        # take care of important entries first
        if not self.dryrun and not self.setup['bundle']:
            for cfile in [cfl for cfl in self.config.findall(".//Path") \
                          if cfl.get('name') in self.__important__ and \
                             cfl.get('type') == 'file']:
                if cfile not in self.whitelist:
                    continue
                tl = [t for t in self.tools if t.handlesEntry(cfile) \
                     and t.canVerify(cfile)]
                if tl:
                    if self.setup['interactive'] and not \
                           promptFilter("Install %s: %s? (y/N):", [cfile]):
                        self.whitelist.remove(cfile)
                        continue
                    try:
                        self.states[cfile] = tl[0].InstallPath(cfile)
                        if self.states[cfile]:
                            tl[0].modified.append(cfile)
                    except:
                        self.logger.error("Unexpected tool failure",
                                          exc_info=1)
                    cfile.set('qtext', '')
                    if tl[0].VerifyPath(cfile, []):
                        self.whitelist.remove(cfile)

    def Inventory(self):
        """
           Verify all entries,
           find extra entries,
           and build up workqueues

        """
        # initialize all states
        for struct in self.config.getchildren():
            for entry in struct.getchildren():
                self.states[entry] = False
        for tool in self.tools:
            try:
                tool.Inventory(self.states)
            except:
                self.logger.error("%s.Inventory() call failed:" % tool.name, exc_info=1)

    def Decide(self):
        """Set self.whitelist based on user interaction."""
        prompt = "Install %s: %s? (y/N): "
        rprompt = "Remove %s: %s? (y/N): "
        if self.setup['remove']:
            if self.setup['remove'] == 'all':
                self.removal = self.extra
            elif self.setup['remove'] in ['services', 'Services']:
                self.removal = [entry for entry in self.extra
                                if entry.tag == 'Service']
            elif self.setup['remove'] in ['packages', 'Packages']:
                self.removal = [entry for entry in self.extra
                                if entry.tag == 'Package']

        candidates = [entry for entry in self.states
                      if not self.states[entry]]

        if self.dryrun:
            if self.whitelist:
                self.logger.info("In dryrun mode: suppressing entry installation for:")
                self.logger.info(["%s:%s" % (entry.tag, entry.get('name'))
                                  for entry in self.whitelist])
                self.whitelist = []
            if self.removal:
                self.logger.info("In dryrun mode: suppressing entry removal for:")
                self.logger.info(["%s:%s" % (entry.tag, entry.get('name'))
                                  for entry in self.removal])
            self.removal = []
            return
        # Here is where most of the work goes
        # first perform bundle filtering
        if self.setup['bundle']:
            all_bundle_names = [b.get('name') for b in
                                self.config.findall('./Bundle')]
            # warn if non-existent bundle given
            for bundle in self.setup['bundle']:
                if bundle not in all_bundle_names:
                    self.logger.info("Warning: Bundle %s not found" % bundle)
            bundles = [b for b in self.config.findall('./Bundle')
                       if b.get('name') in self.setup['bundle']]
            self.whitelist = [e for e in self.whitelist
                              if True in [e in b for b in bundles]]
        elif self.setup['indep']:
            bundles = [nb for nb in self.config.getchildren()
                       if nb.tag != 'Bundle']
        else:
            bundles = self.config.getchildren()

        # first process prereq actions
        for bundle in bundles[:]:
            if bundle.tag != 'Bundle':
                continue
            bmodified = len([item for item in bundle if item in self.whitelist])
            actions = [a for a in bundle.findall('./Action')
                       if (a.get('timing') != 'post' and
                           (bmodified or a.get('when') == 'always'))]
            # now we process all "always actions"
            if self.setup['interactive']:
                promptFilter(prompt, actions)
            self.DispatchInstallCalls(actions)
            
            # need to test to fail entries in whitelist
            if False in [self.states[a] for a in actions]:
                # then display bundles forced off with entries
                self.logger.info("Bundle %s failed prerequisite action" %
                                 (bundle.get('name')))
                bundles.remove(bundle)
                b_to_remv = [ent for ent in self.whitelist if ent in bundle]
                if b_to_remv:
                    self.logger.info("Not installing entries from Bundle %s" %
                                     (bundle.get('name')))
                    self.logger.info(["%s:%s" % (e.tag, e.get('name'))
                                      for e in b_to_remv])
                    [self.whitelist.remove(ent) for ent in b_to_remv]

        if self.setup['interactive']:
            self.whitelist = promptFilter(prompt, self.whitelist)
            self.removal = promptFilter(rprompt, self.removal)

        for entry in candidates:
            if entry not in self.whitelist:
                self.blacklist.append(entry)

    def DispatchInstallCalls(self, entries):
        """Dispatch install calls to underlying tools."""
        for tool in self.tools:
            handled = [entry for entry in entries if tool.canInstall(entry)]
            if not handled:
                continue
            try:
                tool.Install(handled, self.states)
            except:
                self.logger.error("%s.Install() call failed:" % tool.name, exc_info=1)

    def Install(self):
        """Install all entries."""
        self.DispatchInstallCalls(self.whitelist)
        mods = self.modified
        mbundles = [struct for struct in self.config.findall('Bundle') if \
                    [mod for mod in mods if mod in struct]]

        if self.modified:
            # Handle Bundle interdeps
            if mbundles:
                self.logger.info("The Following Bundles have been modified:")
                self.logger.info([mbun.get('name') for mbun in mbundles])
                self.logger.info("")
            tbm = [(t, b) for t in self.tools for b in mbundles]
            for tool, bundle in tbm:
                try:
                    tool.Inventory(self.states, [bundle])
                except:
                    self.logger.error("%s.Inventory() call failed:" % tool.name, exc_info=1)
            clobbered = [entry for bundle in mbundles for entry in bundle \
                         if not self.states[entry] and entry not in self.blacklist]
            if clobbered:
                self.logger.debug("Found clobbered entries:")
                self.logger.debug(["%s:%s" % (entry.tag, entry.get('name')) \
                                   for entry in clobbered])
                if not self.setup['interactive']:
                    self.DispatchInstallCalls(clobbered)

        for bundle in self.config.findall('.//Bundle'):
            if self.setup['bundle'] and \
                   bundle.get('name') not in self.setup['bundle']:
                # prune out unspecified bundles when running with -b
                continue
            for tool in self.tools:
                try:
                    if bundle in mbundles:
                        tool.BundleUpdated(bundle, self.states)
                    else:
                        tool.BundleNotUpdated(bundle, self.states)
                except:
                    self.logger.error("%s.BundleNotUpdated() call failed:" % \
                                      (tool.name), exc_info=1)

    def Remove(self):
        """Remove extra entries."""
        for tool in self.tools:
            extras = [entry for entry in self.removal if tool.handlesEntry(entry)]
            if extras:
                try:
                    tool.Remove(extras)
                except:
                    self.logger.error("%s.Remove() failed" % tool.name, exc_info=1)

    def CondDisplayState(self, phase):
        """Conditionally print tracing information."""
        self.logger.info('\nPhase: %s' % phase)
        self.logger.info('Correct entries:\t%d' % list(self.states.values()).count(True))
        self.logger.info('Incorrect entries:\t%d' % list(self.states.values()).count(False))
        if phase == 'final' and list(self.states.values()).count(False):
            self.logger.info(["%s:%s" % (entry.tag, entry.get('name')) for \
                              entry in self.states if not self.states[entry]])
        self.logger.info('Total managed entries:\t%d' % len(list(self.states.values())))
        self.logger.info('Unmanaged entries:\t%d' % len(self.extra))
        if phase == 'final' and self.setup['extra']:
            self.logger.info(["%s:%s" % (entry.tag, entry.get('name')) \
                              for entry in self.extra])

        self.logger.info("")

        if ((list(self.states.values()).count(False) == 0) and not self.extra):
            self.logger.info('All entries correct.')

    def ReInventory(self):
        """Recheck everything."""
        if not self.dryrun and self.setup['kevlar']:
            self.logger.info("Rechecking system inventory")
            self.Inventory()

    def Execute(self):
        """Run all methods."""
        self.Inventory()
        self.times['inventory'] = time.time()
        self.CondDisplayState('initial')
        self.InstallImportant()
        self.Decide()
        self.Install()
        self.times['install'] = time.time()
        self.Remove()
        self.times['remove'] = time.time()
        if self.modified:
            self.ReInventory()
            self.times['reinventory'] = time.time()
        self.times['finished'] = time.time()
        self.CondDisplayState('final')

    def GenerateStats(self):
        """Generate XML summary of execution statistics."""
        feedback = Bcfg2.Client.XML.Element("upload-statistics")
        stats = Bcfg2.Client.XML.SubElement(feedback,
                                            'Statistics',
                                            total=str(len(self.states)),
                                            client_version=__revision__,
                                            version='2.0',
                                            revision=self.config.get('revision', '-1'))
        good = len([key for key, val in list(self.states.items()) if val])
        stats.set('good', str(good))
        if len([key for key, val in list(self.states.items()) if not val]) == 0:
            stats.set('state', 'clean')
        else:
            stats.set('state', 'dirty')

        # List bad elements of the configuration
        for (data, ename) in [(self.modified, 'Modified'), (self.extra, "Extra"), \
                              ([entry for entry in self.states if not \
                                self.states[entry]], "Bad")]:
            container = Bcfg2.Client.XML.SubElement(stats, ename)
            for item in data:
                item.set('qtext', '')
                container.append(item)
                item.text = None

        timeinfo = Bcfg2.Client.XML.Element("OpStamps")
        feedback.append(stats)
        for (event, timestamp) in list(self.times.items()):
            timeinfo.set(event, str(timestamp))
        stats.append(timeinfo)
        return feedback