from __future__ import print_function
import time
import six
from six.moves.urllib.parse import quote
from twisted.internet import reactor, endpoints
from twisted.internet.defer import inlineCallbacks, returnValue
from twisted.python import usage
from foolscap import base32
from foolscap.eventual import fireEventually
from foolscap.logging import log, flogfile
from foolscap.util import format_time, FORMAT_TIME_MODES, allocate_tcp_port
from twisted.web import server, static, html, resource

class WebViewerOptions(usage.Options):
    synopsis = "Usage: flogtool web-viewer DUMPFILE.flog[.bz2]"

    optFlags = [
        ("quiet", "q", "Don't print instructions to stdout"),
        ("open", "o", "Open the page in your webbrowser automatically"),
        ]

    optParameters = [
        ("port", "p", None,
         "endpoint specification of where the web server should listen."),
        ("timestamps", "t", "short-local",
         "Format for timestamps: " + " ".join(FORMAT_TIME_MODES)),
        ]

    def parseArgs(self, dumpfile):
        self.dumpfile = dumpfile

    def opt_timestamps(self, arg):
        if arg not in FORMAT_TIME_MODES:
            raise usage.UsageError("--timestamps= must be one of (%s)" %
                                   ", ".join(FORMAT_TIME_MODES))
        self["timestamps"] = arg

FLOG_CSS = """
span.MODELINE {
 font-size: 60%;
}
span.NOISY {
 color: #000080;
}
span.OPERATIONAL {
 color: #000000;
}
span.UNUSUAL {
 color: #000000;
 background-color: #ff8080;
}
span.INFREQUENT {
 color: #000000;
 background-color: #ff8080;
}
span.CURIOUS {
 color: #000000;
 background-color: #ff8080;
}
span.WEIRD {
 color: #000000;
 background-color: #ff4040;
}
span.SCARY {
 color: #000000;
 background-color: #ff4040;
}
span.BAD {
 color: #000000;
 background-color: #ff0000;
}

"""

def web_format_time(t, mode="short-local"):
    time_s = format_time(t, mode)
    time_utc = format_time(t, "utc")
    time_local = format_time(t, "long-local")
    time_ctime = time.ctime(t).replace(" ", "&nbsp;")
    extended = "Local=%s  Local=%s  UTC=%s" % (time_ctime, time_local, time_utc)
    return time_s, extended

def web_escape(u):
    return html.escape(six.ensure_str(u))

class Welcome(resource.Resource):
    def __init__(self, viewer, timestamps):
        self.viewer = viewer
        self.default_timestamps = timestamps
        resource.Resource.__init__(self)

    def fromto_time(self, t, timestamps):
        if t is None:
            return "?"
        ign, extended = web_format_time(float(t), timestamps)
        tz = time.strftime("%z", time.localtime(t))
        return '<span title="%s">%s (%s)</span>' % (extended, time.ctime(t), tz)

    def render(self, req):
        timestamps = self.default_timestamps
        data = "<html>"
        data += "<head><title>Foolscap Log Viewer</title></head>\n"
        data += "<body>\n"
        data += "<h1>Foolscap Log Viewer</h1>\n"

        data += "<h2>Logfiles:</h2>\n"
        if self.viewer.logfiles:
            data += "<ul>\n"
            for lfnum,lf in enumerate(self.viewer.logfiles):
                data += " <li>%s:\n" % html.escape(lf)
                data += " <ul>\n"
                ((first_number, first_time),
                 (last_number, last_time),
                 num_events, levels, pid, versions) = self.viewer.summaries[lf]
                # remember: the logfile uses JSON, so all strings will be
                # unicode, and twisted.web requires bytes
                data += "  <li>PID %s</li>\n" % html.escape(str(pid))
                if versions:
                    data += "  <li>Application Versions:\n"
                    data += "   <ul>\n"
                    for name in sorted(versions.keys()):
                        ver = versions[name]
                        data += "    <li>%s: %s</li>\n" % (web_escape(name),
                                                           web_escape(ver))
                    data += "   </ul>\n"
                    data += "  </li>\n"
                if first_time and last_time:
                    duration = int(last_time - first_time)
                else:
                    duration = "?"

                data += ("  <li>%s events covering %s seconds</li>\n" %
                         (num_events, duration))

                from_time_s = self.fromto_time(float(first_time), timestamps)
                to_time_s = self.fromto_time(float(last_time), timestamps)
                data += '  <li>from %s to %s</li>\n' % (from_time_s, to_time_s)
                for level in sorted(levels.keys()):
                    data += ('  <li><a href="summary/%d-%d">%d events</a> '
                             'at level %s</li>\n' %
                             (lfnum, level, len(levels[level]),
                              level))
                if self.viewer.triggers:
                    data += " <li>Incident Triggers:\n"
                    data += "  <ul>\n"
                    for t in self.viewer.triggers:
                        le = self.viewer.number_map[t]
                        data += "   <li>"
                        href_base = "/all-events?timestamps=%s" % timestamps
                        data += le.to_html(href_base, timestamps)
                        data += "   </li>\n"
                    data += "  </ul>\n"
                    data += " </li>\n"
                data += " </ul>\n"
            data += "</ul>\n"
        else:
            data += "none!"

        data += '<h2><a href="all-events?timestamps=%s">' % timestamps
        data += 'View All Events</a></h2>\n'
        data += '<form action="reload" method="post">\n'
        data += ' <input type="submit" value="Reload Logfile" />\n'
        data += '</form>\n'

        data += "</body></html>"
        req.setHeader("content-type", "text/html")
        return six.ensure_binary(data)

class Summary(resource.Resource):
    def __init__(self, viewer):
        self._viewer = viewer
        resource.Resource.__init__(self)

    def getChild(self, path, req):
        if b"-" in path:
            lfnum,levelnum = list(map(int, path.split(b"-")))
            lf = self._viewer.logfiles[lfnum]
            (first, last, num_events, levels,
             pid, versions) = self._viewer.summaries[lf]
            events = levels[levelnum]
            return SummaryView(events, levelnum)
        return resource.Resource.getChild(self, path, req)

class SummaryView(resource.Resource):
    def __init__(self, events, levelnum):
        self._events = events
        self._levelnum = levelnum
        resource.Resource.__init__(self)

    def render(self, req):
        data = "<html>"
        data += "<head><title>Foolscap Log Viewer</title>\n"
        data += '<link href="flog.css" rel="stylesheet" type="text/css" />'
        data += "</head>\n"
        data += "<body>\n"
        data += "<h1>Events at level %d</h1>\n" % self._levelnum

        data += "<ul>\n"
        for e in self._events:
            data += "<li>" + e.to_html("/all-events") + "</li>\n"
        data += "</ul>\n"
        data += "</body>\n"
        data += "</html>\n"
        return six.ensure_binary(data)



class EventView(resource.Resource):
    def __init__(self, viewer):
        self.viewer = viewer
        resource.Resource.__init__(self)

    def render(self, req):
        sortby = req.args.get("sort", ["nested"])[0]
        timestamps = req.args.get("timestamps", ["short-local"])[0]

        data = "<html>"
        data += "<head><title>Foolscap Log Viewer</title>\n"
        data += '<link href="flog.css" rel="stylesheet" type="text/css" />'
        data += "</head>\n"
        data += "<body>\n"
        data += "<h1>Event Log</h1>\n"

        data += "%d root events " % len(self.viewer.root_events)

        url = "/all-events?sort=%s" % sortby
        other_timestamps = ['<a href="%s&timestamps=short-local">local</a>' % url,
                            '<a href="%s&timestamps=utc">utc</a>' % url]
        url = "/all-events?timestamps=%s" % timestamps
        other_sortby = ['<a href="%s&sort=nested">nested</a>' % url,
                        '<a href="%s&sort=number">number</a>' % url,
                        '<a href="%s&sort=time">time</a>' % url]
        modeline = ''.join(['<span class="MODELINE">',
                            'timestamps=%s ' % timestamps,
                            '(switch to %s) ' % ", ".join(other_timestamps),
                            'sort=%s ' % sortby,
                            '(switch to %s)' % ", ".join(other_sortby),
                            '</span>\n'])
        data += modeline

        data += "<ul>\n"
        if sortby == "nested":
            for e in self.viewer.root_events:
                data += self._emit_events(0, e, timestamps)
        elif sortby == "number":
            numbers = sorted(self.viewer.number_map.keys())
            for n in numbers:
                e = self.viewer.number_map[n]
                data += '<li><span class="%s">' % e.level_class()
                data += e.to_html(timestamps=timestamps)
                data += '</span></li>\n'
        elif sortby == "time":
            events = list(self.viewer.number_map.values())
            events.sort(key=lambda a: a.e['d']['time'])
            for e in events:
                data += '<li><span class="%s">' % e.level_class()
                data += e.to_html(timestamps=timestamps)
                data += '</span></li>\n'
        else:
            data += "<b>unknown sort argument '%s'</b>\n" % sortby

        data += "</ul>\n"
        req.setHeader("content-type", "text/html")
        return six.ensure_binary(data)

    def _emit_events(self, indent, event, timestamps):
        indent_s = " " * indent
        data = (indent_s
                + '<li><span class="%s">' % event.level_class()
                + event.to_html(timestamps=timestamps)
                + "</span></li>\n"
                )
        if event.children:
            data += indent_s + "<ul>\n"
            for child in event.children:
                data += self._emit_events(indent+1, child, timestamps)
            data += indent_s + "</ul>\n"
        return data


class LogEvent:
    def __init__(self, e):
        self.e = e
        self.parent = None
        self.children = []
        self.index = None
        self.anchor_index = "no-number"
        self.incarnation = base32.encode(e['d']['incarnation'][0].encode("utf-8"))
        if 'num' in e['d']:
            self.index = (e['from'], e['d']['num'])
            self.anchor_index = "%s_%s_%d" % (quote(e['from'].encode("utf-8")),
                                              self.incarnation.encode("utf-8"),
                                              e['d']['num'])
        self.parent_index = None
        if 'parent' in e['d']:
            self.parent_index = (e['from'], e['d']['parent'])
        self.is_trigger = False

    LEVELMAP = {
        log.NOISY: "NOISY",
        log.OPERATIONAL: "OPERATIONAL",
        log.UNUSUAL: "UNUSUAL",
        log.INFREQUENT: "INFREQUENT",
        log.CURIOUS: "CURIOUS",
        log.WEIRD: "WEIRD",
        log.SCARY: "SCARY",
        log.BAD: "BAD",
        }

    def level_class(self):
        level = self.e['d'].get('level', log.OPERATIONAL)
        return self.LEVELMAP.get(level, "UNKNOWN")

    def to_html(self, href_base="", timestamps="short-local"):
        # this must return bytes to satisfy twisted.web, but the logfile is
        # JSON so we get unicode here
        d = self.e['d']
        time_short, time_extended = web_format_time(d['time'], timestamps)
        msg = web_escape(log.format_message(d))
        if 'failure' in d:
            lines = str(d['failure']).split("\n")
            html_lines = [web_escape(line) for line in lines]
            f_html = "\n".join(html_lines)
            msg += " FAILURE:<pre>%s</pre>" % f_html
        level = d.get('level', log.OPERATIONAL)
        level_s = ""
        if level >= log.UNUSUAL:
            level_s = self.LEVELMAP.get(level, "") + " "
        details = "  ".join(["Event #%d" % d['num'],
                             "TubID=%s" % web_escape(self.e['from']),
                             "Incarnation=%s" % web_escape(self.incarnation),
                             time_extended])
        label = '<span title="%s">%s</span>' % (details, time_short)
        data = '%s [<span id="E%s"><a href="%s#E%s">%d</a></span>]: %s%s' \
               % (label,
                  self.anchor_index, href_base, self.anchor_index, d['num'],
                  level_s, msg)
        if self.is_trigger:
            data += " [INCIDENT-TRIGGER]"
        return data

class Reload(resource.Resource):

    def __init__(self, viewer):
        self.viewer = viewer
        resource.Resource.__init__(self)

    def render_POST(self, req):
        self.viewer.load_logfiles()
        req.redirect("/")
        return b''

class WebViewer:

    def run(self, options):
        d = fireEventually(options)
        d.addCallback(self.start)
        d.addErrback(self._error)
        print("starting..")
        reactor.run()

    def _error(self, f):
        print("ERROR", f)
        reactor.stop()

    @inlineCallbacks
    def start(self, options):
        root = static.Data("placeholder", "text/plain")
        welcome = Welcome(self, options["timestamps"])
        root.putChild(b"", welcome)
        root.putChild(b"welcome", welcome) # we used to only do this
        root.putChild(b"reload", Reload(self))
        root.putChild(b"all-events", EventView(self))
        root.putChild(b"summary", Summary(self))
        root.putChild(b"flog.css", static.Data(six.ensure_binary(FLOG_CSS), "text/css"))
        s = server.Site(root)

        port = options["port"]
        if not port:
            port = "tcp:%d:interface=127.0.0.1" % allocate_tcp_port()
        ep = endpoints.serverFromString(reactor, port)
        self.lp = yield ep.listen(s)
        portnum = self.lp.getHost().port
        # TODO: this makes all sort of assumptions: HTTP-vs-HTTPS, localhost.
        url = "http://localhost:%d/" % portnum

        if not options["quiet"]:
            print("scanning..")
        self.logfiles = [options.dumpfile]
        self.load_logfiles()

        if not options["quiet"]:
            print("please point your browser at:")
            print(url)
        if options["open"]:
            import webbrowser
            webbrowser.open(url)

        returnValue(url) # for tests

    def stop(self):
        return self.lp.stopListening()

    def load_logfiles(self):
        #self.summary = {} # keyed by logfile name
        (self.summaries,
         self.root_events,
         self.number_map,
         self.triggers) = self.process_logfiles(self.logfiles)

    def process_logfiles(self, logfiles):
        summaries = {}
        # build up a tree of events based upon parent/child relationships
        number_map = {}
        roots = []
        trigger_numbers = []
        first_event_from = None

        for lf in logfiles:
            (first_event_number, first_event_time) = (None, None)
            (last_event_number, last_event_time) = (None, None)
            num_events = 0
            levels = {}
            pid = None

            for e in flogfile.get_events(lf):
                if "header" in e:
                    h = e["header"]
                    if h["type"] == "incident":
                        t = h["trigger"]
                        trigger_numbers.append(t["num"])
                    pid = h.get("pid")
                    versions = h.get("versions", {})
                if "d" not in e:
                    continue # skip headers
                if not first_event_from:
                    first_event_from = e['from']
                le = LogEvent(e)
                if le.index:
                    number_map[le.index] = le
                if le.parent_index in number_map:
                    le.parent = number_map[le.parent_index]
                    le.parent.children.append(le)
                else:
                    roots.append(le)
                d = e['d']
                level = d.get("level", "NORMAL")
                number = d.get("num", None)
                when = d.get("time")
                if number in trigger_numbers:
                    le.is_trigger = True

                if False:
                    # this is only meaningful if the logfile contains events
                    # from just a single tub and incarnation, but our current
                    # LogGatherer combines multiple processes' logs into a
                    # single file.
                    if first_event_number is None:
                        first_event_number = number
                    elif number is not None:
                        first_event_number = min(first_event_number, number)

                    if last_event_number is None:
                        last_event_number = number
                    elif number is not None:
                        last_event_number = max(last_event_number, number)

                if first_event_time is None:
                    first_event_time = when
                elif when is not None:
                    first_event_time = min(first_event_time, when)
                if last_event_time is None:
                    last_event_time = when
                elif when is not None:
                    last_event_time = max(last_event_time, when)

                num_events += 1
                if level not in levels:
                    levels[level] = []
                levels[level].append(le)

            summary = ( (first_event_number, first_event_time),
                        (last_event_number, last_event_time),
                        num_events, levels, pid, versions )
            summaries[lf] = summary

        triggers = [(first_event_from, num) for num in trigger_numbers]

        return summaries, roots, number_map, triggers
