from bigquery_analytics import BigQueryAnalytics, BIGQUERY_AVAILABLE
import datetime
import re
import os
import sys
import time
import json
import traceback
import urllib2

# XXX hardcoded path
sys.path.append("/opt/xos")

os.environ.setdefault("DJANGO_SETTINGS_MODULE", "xos.settings")
from django.conf import settings
from django import db
from django.db import connection
from core.models import Slice, Instance, ServiceClass, Reservation, Tag, Network, User, Node, Image, Deployment, Site, NetworkTemplate, NetworkSlice, Service

BLUE_LOAD=5000000
RED_LOAD=15000000

glo_cached_queries = {}

class XOSAnalytics(BigQueryAnalytics):
    def __init__(self, tableName=None):
        if not tableName:
            tableName = settings.BIGQUERY_TABLE

        BigQueryAnalytics.__init__(self, tableName)

    def service_to_sliceNames(self, serviceName):
        service=Service.objects.get(name=serviceName)
        try:
            slices = service.slices.all()
        except:
            # BUG in data model -- Slice.service has related name 'service' and
            #                      it should be 'slices'
            slices = service.service.all()

        return [slice.name for slice in slices]

    def compose_query(self, filter={}, timeBucket="60", avg=[], sum=[], count=[], computed=[], val=[], groupBy=["Time"], orderBy=["Time"], tableName=None, latest=False, maxAge=60*60):
        if tableName is None:
            tableName = self.tableName

        maxAge = maxAge * 1000
        tablePart = "[%s.%s@-%d--1]" % ("vicci", tableName, maxAge)

        fields = []
        fieldNames = []
        srcFieldNames = ["time"]

        fields.append("SEC_TO_TIMESTAMP(INTEGER(TIMESTAMP_TO_SEC(time)/%s)*%s) as Time" % (str(timeBucket),str(timeBucket)))
        #fields.append("INTEGER(TIMESTAMP_TO_SEC(time)/%s)*%s as Time" % (str(timeBucket),str(timeBucket)))

        for fieldName in avg:
            fields.append("AVG(%s) as avg_%s" % (fieldName, fieldName.replace("%","")))
            fieldNames.append("avg_%s" % fieldName.replace("%",""))
            srcFieldNames.append(fieldName)

        for fieldName in sum:
            fields.append("SUM(%s) as sum_%s" % (fieldName, fieldName.replace("%","")))
            fieldNames.append("sum_%s" % fieldName.replace("%",""))
            srcFieldNames.append(fieldName)

        for fieldName in count:
            fields.append("COUNT(distinct %s) as count_%s" % (fieldName, fieldName.replace("%","")))
            fieldNames.append("count_%s" % fieldName.replace("%",""))
            srcFieldNames.append(fieldName)

        for fieldName in val:
            fields.append(fieldName)
            fieldNames.append(fieldName)
            srcFieldNames.append(fieldName)

        for fieldName in computed:
            operator = "/"
            parts = fieldName.split("/")
            computedFieldName = "computed_" + parts[0].replace("%","")+"_div_"+parts[1].replace("%","")
            if len(parts)==1:
                operator = "*"
                parts = computed.split("*")
                computedFieldName = "computed_" + parts[0].replace("%","")+"_mult_"+parts[1].replace("%","")
            fields.append("SUM(%s)%sSUM(%s) as %s" % (parts[0], operator, parts[1], computedFieldName))
            fieldNames.append(computedFieldName)
            srcFieldNames.append(parts[0])
            srcFieldNames.append(parts[1])

        for fieldName in groupBy:
            if (fieldName not in ["Time"]):
                fields.append(fieldName)
                fieldNames.append(fieldName)
                srcFieldNames.append(fieldName)

        fields = ", ".join(fields)

        where = []

        if filter.get("slice",None):
            where.append("%%slice='%s'" % filter["slice"])
        if filter.get("site",None):
            where.append("%%site='%s'" % filter["site"])
        if filter.get("node",None):
            where.append("%%hostname='%s'" % filter["node"])
        if filter.get("event",None):
            where.append("event='%s'" % filter["event"])
        if filter.get("service",None):
            sliceNames = self.service_to_sliceNames(filter["service"])
            if sliceNames:
                where.append("(" + " OR ".join(["%%slice='%s'" % sliceName for sliceName in sliceNames]) +")")

        if where:
            where = " WHERE " + " AND ".join(where)
        else:
            where =""

        if groupBy:
            groupBySub = " GROUP BY " + ",".join(groupBy + ["%hostname"])
            groupBy = " GROUP BY " + ",".join(groupBy)
        else:
            groupBySub = " GROUP BY %hostname"
            groupBy = ""

        if orderBy:
            orderBy = " ORDER BY " + ",".join(orderBy)
        else:
            orderBy = ""

        if latest:
            latestFields = ["table1.%s as %s" % (x,x) for x in srcFieldNames]
            latestFields = ", ".join(latestFields)
            tablePart = """(SELECT %s FROM %s AS table1
                            JOIN
                                (SELECT %%hostname, event, max(time) as maxtime from %s GROUP BY %%hostname, event) AS latest
                            ON
                                table1.%%hostname = latest.%%hostname AND table1.event = latest.event AND table1.time = latest.maxtime)""" % (latestFields, tablePart, tablePart)

        if computed:
            subQuery = "SELECT %%hostname, %s FROM %s" % (fields, tablePart)
            if where:
                subQuery = subQuery + where
            subQuery = subQuery + groupBySub

            sumFields = []
            for fieldName in fieldNames:
                if fieldName.startswith("avg"):
                    sumFields.append("AVG(%s) as avg_%s"%(fieldName,fieldName))
                    sumFields.append("MAX(%s) as max_%s"%(fieldName,fieldName))
                elif (fieldName.startswith("count")) or (fieldName.startswith("sum")) or (fieldName.startswith("computed")):
                    sumFields.append("SUM(%s) as sum_%s"%(fieldName,fieldName))
                else:
                    sumFields.append(fieldName)

            sumFields = ",".join(sumFields)

            query = "SELECT %s, %s FROM (%s)" % ("Time", sumFields, subQuery)
            if groupBy:
                query = query + groupBy
            if orderBy:
                query = query + orderBy
        else:
            query = "SELECT %s FROM %s" % (fields, tablePart)
            if where:
                query = query + " " + where
            if groupBy:
                query = query + groupBy
            if orderBy:
                query = query + orderBy

        return query

    def get_list_from_req(self, req, name, default=[]):
        value = req.GET.get(name, None)
        if not value:
            return default
        value=value.replace("@","%")
        return value.split(",")

    def format_result(self, format, result, query, dataSourceUrl):
        if not BIGQUERY_AVAILABLE:
            msg = "BigQuery Statistics Unavaiable"
        else:
            msg = None

        if (format == "json_dicts"):
            result = {"query": query, "rows": result, "dataSourceUrl": dataSourceUrl, "msg": msg}
            return ("application/javascript", json.dumps(result))

        elif (format == "json_arrays"):
            new_result = []
            for row in result:
                new_row = []
                for key in sorted(row.keys()):
                    new_row.append(row[key])
                new_result.append(new_row)
                new_result = {"query": query, "rows": new_result, "msg": msg}
            return ("application/javascript", json.dumps(new_result))

        elif (format == "html_table"):
            new_rows = []
            for row in result:
                new_row = []
                for key in sorted(row.keys()):
                    new_row.append("<TD>%s</TD>" % str(row[key]))
                new_rows.append("<TR>%s</TR>" % "".join(new_row))

            new_result = "<TABLE>%s</TABLE>" % "\n".join(new_rows)

            return ("text/html", new_result)

    def merge_datamodel_sites(self, rows, slice=None):
        """ For a query that included "site" in its groupby, merge in the
            opencloud site information.
        """

        if slice:
            try:
                slice = Slice.objects.get(name=slice)
            except:
                slice = None

        for row in rows:
            sitename = row["site"]
            try:
                model_site = Site.objects.get(name=sitename)
            except:
                # we didn't find it in the data model
                continue

            allocated_instances = 0
            if model_site and slice:
                for instance in slice.instances.all():
                    if instance.node.site == model_site:
                        allocated_instances = allocated_instances + 1

            row["lat"] = float(model_site.location.latitude)
            row["long"] = float(model_site.location.longitude)
            row["url"] = model_site.site_url
            row["numNodes"] = model_site.nodes.count()
            row["allocated_instances"] = allocated_instances

            max_cpu = row.get("max_avg_cpu", row.get("max_cpu",0))
            cpu=float(max_cpu)/100.0
            row["hotness"] = max(0.0, ((cpu*RED_LOAD) - BLUE_LOAD)/(RED_LOAD-BLUE_LOAD))

    def compose_cached_query(self, querySpec='default'):
        """ Compose a query that returns the 'most recent' row for each (hostname, event)
            pair.

            Note that groupByFields cannot contain any values that are 'Null' or those
            rows will be excluded. For example, if groupByFields includes cp, then
            there will be no libvirt_event rows, since libvirt_event does not have
            cp.

            This means we can't really have 'one query to rule them'. Settle on
            having a couple of different queries, and have the caller specify
            which one he wants.
        """

        fieldNames = ["%hostname", "%bytes_sent", "%bytes_hit", "%healthy", "time", "event", "%site", "%elapsed", "%cpu"]

        if querySpec=="default":
            groupByFields = ["%hostname", "event"]
        elif (querySpec=="hpc"):
            fieldNames.append("%cp")
            groupByFields = ["%hostname", "event", "%cp"]
        else:
            raise ValueError("Unknown queryspec %s" % querySpec)

        fields = ["table1.%s AS %s" % (x,x) for x in fieldNames]
        fields = ", ".join(fields)

        tableDesc = "%s.%s" % (self.projectName, self.tableName)

        groupByOn = ["table1.time = latest.maxtime"]
        for field in groupByFields:
            groupByOn.append("table1.%s = latest.%s" % (field, field))

        groupByOn = " AND ".join(groupByOn)
        groupByFields = ", ".join(groupByFields)

        base_query = "SELECT %s FROM [%s@-3600000--1] AS table1 JOIN (SELECT %s, max(time) as maxtime from [%s@-3600000--1] GROUP BY %s) AS latest ON %s" % \
                      (fields, tableDesc, groupByFields, tableDesc, groupByFields, groupByOn)

        return base_query

    def get_cached_query_results(self, q, wait=True):
        global glo_cached_queries

        if q in glo_cached_queries:
            if (time.time() - glo_cached_queries[q]["time"]) <= 60:
                print "using cached query"
                return glo_cached_queries[q]["rows"]

        if not wait:
            return None

        print "refreshing cached query"
        result = self.run_query(q)
        glo_cached_queries[q] = {"time": time.time(), "rows": result}

        return result

    def process_request(self, req):
        print req.GET

        tqx = req.GET.get("tqx", None)

        slice = req.GET.get("slice", None)
        site = req.GET.get("site", None)
        node = req.GET.get("node", None)
        service = req.GET.get("service", None)
        event = req.GET.get("event", "libvirt_heartbeat")
        cp = req.GET.get("cp", None)

        format = req.GET.get("format", "json_dicts")

        timeBucket = int(req.GET.get("timeBucket", 60))
        avg = self.get_list_from_req(req, "avg")
        sum = self.get_list_from_req(req, "sum")
        count = self.get_list_from_req(req, "count")
        computed = self.get_list_from_req(req, "computed")
        groupBy = self.get_list_from_req(req, "groupBy", ["Time"])
        orderBy = self.get_list_from_req(req, "orderBy", ["Time"])

        maxRows = req.GET.get("maxRows", None)
        mergeDataModelSites = req.GET.get("mergeDataModelSites", None)

        maxAge = int(req.GET.get("maxAge", 60*60))

        cached = req.GET.get("cached", None)
        cachedGroupBy = self.get_list_from_req(req, "cachedGroupBy", ["doesnotexist"])

        filter={}
        if slice:
            filter["slice"] = slice
        if site:
            filter["site"] = site
        if node:
            filter["hostname"] = node
        if event:
            filter["event"] = event
        if cp:
            filter["cp"] = cp

        q = self.compose_query(filter, timeBucket, avg, sum, count, computed, [], groupBy, orderBy, maxAge=maxAge)

        print q

        dataSourceUrl = "http://" + req.META["SERVER_NAME"] + ":" + req.META["SERVER_PORT"] + req.META["PATH_INFO"] + "?" + req.META["QUERY_STRING"].replace("format=","origFormat=").replace("%","%25") + "&format=charts";

        if (format=="dataSourceUrl"):
            result = {"dataSourceUrl": dataSourceUrl}
            return ("application/javascript", result)

        elif (format=="raw"):
            result = self.run_query_raw(q)
            result["dataSourceUrl"] = dataSourceUrl

            result = json.dumps(result);

            return ("application/javascript", result)

        elif (format=="nodata"):
            result = {"dataSourceUrl": dataSourceUrl, "query": q}
            result = json.dumps(result);
            return {"application/javascript", result}

        elif (format=="charts"):
            bq_result = self.run_query_raw(q)

            # cloudscrutiny code is probably better!
            table = {}
            table["cols"] = self.schema_to_cols(bq_result["schema"])
            rows = []
            if "rows" in bq_result:
                for row in bq_result["rows"]:
                    rowcols = []
                    for (colnum,col) in enumerate(row["f"]):
                        if (colnum==0):
                            dt = datetime.datetime.fromtimestamp(float(col["v"]))
                            rowcols.append({"v": 'new Date("%s")' % dt.isoformat()})
                        else:
                            try:
                                rowcols.append({"v": float(col["v"])})
                            except:
                                rowcols.append({"v": col["v"]})
                    rows.append({"c": rowcols})
            table["rows"] = rows

            if tqx:
                reqId = tqx.strip("reqId:")
            else:
                reqId = "0"

            result = {"status": "okColumnChart", "reqId": reqId, "table": table, "version": "0.6"}

            result = "google.visualization.Query.setResponse(" + json.dumps(result) + ");"

            def unquote_it(x): return x.group()[1:-1].replace('\\"', '"')

            p = re.compile(r'"new Date\(\\"[^"]*\\"\)"')
            result=p.sub(unquote_it, result)

            return ("application/javascript", result)

        else:
            if cached:
                results = self.get_cached_query_results(self.compose_cached_query(cached))

                result = self.postprocess_results(results, filter=filter, sum=sum, count=count, avg=avg, computed=computed, maxDeltaTime=120, groupBy=cachedGroupBy)
            else:
                result = self.run_query(q)

            if maxRows:
                result = result[-int(maxRows):]

            if mergeDataModelSites:
                self.merge_datamodel_sites(result)

            return self.format_result(format, result, q, dataSourceUrl)

def DoXOSAnalytics(request):
    bq = XOSAnalytics()
    result = bq.process_request(request)

    return result

def main():
    bq = XOSAnalytics(tableName="demoevents")

    q = bq.compose_cached_query()
    results = bq.run_query(q)

    #results = bq.postprocess_results(results,
    #                                 filter={"slice": "HyperCache"},
    #                                 groupBy=["site"],
    #                                 computed=["bytes_sent/elapsed"],
    #                                 sum=["bytes_sent", "computed_bytes_sent_div_elapsed"], avg=["cpu"],
    #                                 maxDeltaTime=60)

    #results = bq.postprocess_results(results, filter={"slice": "HyperCache"}, maxi=["cpu"], count=["hostname"], computed=["bytes_sent/elapsed"], groupBy=["Time", "site"], maxDeltaTime=80)

    results = bq.postprocess_results(results,filter={"event": "libvirt_heartbeat"}, avg=["cpu"], count=["hostname"], groupBy=["doesnotexist"])

    bq.dump_table(results)

    sys.exit(0)

    q=bq.compose_query(sum=["%bytes_sent"], avg=["%cpu"], latest=True, groupBy=["Time", "%site"])
    print q
    bq.dump_table(bq.run_query(q))

    q=bq.compose_query(avg=["%cpu","%bandwidth"], count=["%hostname"], slice="HyperCache")
    print q
    bq.dump_table(bq.run_query(q))

    q=bq.compose_query(computed=["%bytes_sent/%elapsed"])
    print
    print q
    bq.dump_table(bq.run_query(q))

    q=bq.compose_query(timeBucket=60*60, avg=["%cpu"], count=["%hostname"], computed=["%bytes_sent/%elapsed"])
    print
    print q
    bq.dump_table(bq.run_query(q))

if __name__ == "__main__":
    main()