import os
import logging
from decouple import config
import yaml
from dynatrace import Dynatrace
import logging
import pandas as pd
import copy
import time;


def writeToExcel(env, t, result):
    list_available = []
    list_legacy = []
    list_obsolete = []
    
    for type in ["available", "legacy", "obsolete"]:
        for i, (ki, vi) in enumerate(result[type].items()):
            if type == "available":
                list_available.append([vi["id"], vi["name"], vi["owner"]])
            if type == "legacy":
                list_legacy.append([vi["id"], vi["name"], vi["owner"]])
            if type == "obsolete":
                list_obsolete.append([vi["id"], vi["name"], vi["owner"]])

    df_available = pd.DataFrame(list_available, columns=['id', 'name', 'owner'])
    df_legacy = pd.DataFrame(list_legacy, columns=['id', 'name', 'owner'])
    df_obsolete = pd.DataFrame(list_obsolete, columns=['id', 'name', 'owner'])
    
    filename = os.path.join(".\log",
                            str(t) + "_" + str(env) + '_dashboards.xlsx')
    os.makedirs(os.path.dirname(filename), exist_ok=True)

    with pd.ExcelWriter(filename) as writer:
        df_available.to_excel(writer, sheet_name='available')
        df_legacy.to_excel(writer, sheet_name='legacy')
        df_obsolete.to_excel(writer, sheet_name='obsolete')


def evaluate(env, data):
    legacy = {}
    available = {}
    obsolete = {}
    dict_dashboards = data[0]
    list_dashboard_ids = data[1]
    dict_metric_queries = data[2]
    list_metric_query_ids = data[3]
    dict_metric_queries_copy = copy.deepcopy(dict_metric_queries)
    list_metric_query_copy_ids = copy.deepcopy(list_metric_query_ids)

    
    for x, (m, metric_query) in enumerate(dict_metric_queries.items()):
        if metric_query["id"] not in list_dashboard_ids:
            legacy[x] = {"id" : metric_query["id"],
                         "name" : metric_query["name"],
                         "owner" : metric_query["owner"]}
            del dict_metric_queries_copy[m]
            list_metric_query_copy_ids.remove(metric_query["id"])
    logging.debug("%s %s have been deleted in the past", str(env), len(legacy))
    logging.debug("%s %s dashboards with viewCount and active", str(env),
                  len(dict_metric_queries_copy))

    for i, (d, dashboard) in enumerate(dict_dashboards.items()):
        if dashboard["id"] in list_metric_query_copy_ids:
            available[i] = dashboard
        if dashboard["id"] not in list_metric_query_copy_ids:
            obsolete[i] = dashboard
    logging.info("%s %s dashboards with viewCount!", str(env), len(available))    
    logging.info("%s %s dashboards with 0 viewCount!", str(env), len(obsolete))

    return {"available" : available, "legacy" : legacy, "obsolete" : obsolete}


def adaptDataStructure(dashboards, metric_queries):
    dict_dashboards= {}
    list_dashboard_ids = []
    dict_metric_queries = {}
    list_metric_query_ids = []
    
    for s, stub in enumerate(getattr(dashboards, "_PaginatedList__elements")):
        dict_dashboards[s] = {"id" : getattr(stub, "id"),
                              "name" : getattr(stub, "name"),
                              "owner" : getattr(stub, "owner")}
        list_dashboard_ids.append(getattr(stub, "id"))

    for collection in getattr(metric_queries, "_PaginatedList__elements"):
        for m, q in enumerate(getattr(collection, "data")):
            dict_metric_queries[m] = {"id" : getattr(q, "dimension_map")["id"],
                                      "name" : None,
                                      "owner" : None}
            list_metric_query_ids.append(getattr(q, "dimension_map")["id"])

    return [dict_dashboards, list_dashboard_ids, dict_metric_queries,
            list_metric_query_ids]


def getDashboardsWithViewCount(env, client, METRIC_SELECTOR, RESOLUTION,
                               FROM_DATE, TO_DATE):
    logging.debug("%s get dashboards with viewCount, resolution %s ...", 
                  str(env), RESOLUTION)
    metric_query = client.metrics.query(METRIC_SELECTOR, RESOLUTION, FROM_DATE,
                                      TO_DATE)
    n_metric_query = getattr(metric_query, "_PaginatedList__total_count")
    logging.debug("%s %s dashboards with viewCount and older than 6 Months",
                 str(env), str(n_metric_query))

    return metric_query


def getDashboards(env, client):
    logging.debug("%s get all dashboards...", str(env))
    dashboards = client.dashboards.list(owner=None, tags=None)
    n_dashboards = getattr(dashboards, "_PaginatedList__total_count")
    logging.info("%s %s total dashboards", str(env), str(n_dashboards))

    return dashboards


def initDtClient(env, DT_URL, DT_TOKEN):
    logging.debug("%s init Dynatrace client...", str(env))
    DT_CLIENT = Dynatrace(DT_URL, DT_TOKEN, logging.Logger("ERROR"), None, None,
                          0, 10*1000)
    return DT_CLIENT


if __name__ == "__main__":
    t = time.strftime("%Y%m%d-%H%M%S")

    logging.basicConfig(level=logging.INFO, format='%(levelname)s: %(message)s')

    with open(os.path.basename("./environment.yaml")) as env_cfg:
            environment = yaml.safe_load(env_cfg)

    for env, doc in environment.items():
        logging.debug("%s checking token...", str(env))

        if config(dict(doc[2]).get("env-token-name"), default='') != "": 
            DT_URL = dict(doc[1]).get("env-url")
            DT_TOKEN = config(dict(doc[2]).get("env-token-name"), default='')
            METRIC_SELECTOR = dict(doc[5]).get("metricSelector")
            RESOLUTION = dict(doc[6]).get("resolution")
            FROM_DATE= dict(doc[7]).get("fromDate")
            TO_DATE= dict(doc[8]).get("toDate")

            client = initDtClient(env, DT_URL, DT_TOKEN)
            dashboards = getDashboards(env, client)
            metric_queries = getDashboardsWithViewCount(env, client,
                                                        METRIC_SELECTOR,
                                                        RESOLUTION, FROM_DATE,
                                                        TO_DATE)
            data = adaptDataStructure(dashboards, metric_queries)
            result = evaluate(env, data)
            writeToExcel(env, t, result)

            print("finished")