#!/usr/bin/env python3

"""
Python module to automatically analyze benchmark results
"""

import csv
import os
import abc
import re
import datetime
import time

import matplotlib.pyplot as pplot

EPOCHRE = re.compile(r"\[[0-9]+\.[0-9]+]")
TIMERE = re.compile(r"time=[0-9]+\.[0-9]+ ms")
NUMBERRE = re.compile(r"[0-9]+\.[0-9]+")


def average(lst: list) -> float:
    """
    Agerage of list
    :param lst:
    :return:
    """
    return sum(lst) / len(lst)


def keychars(x):
    """
    Return hey partnumber
    :param x:
    :return:
    """
    return int(x.split('.')[1])


class Analyzer(abc.ABC):
    """
    Very abstract analyzer
    """

    def __init__(self, typeof='.csv'):
        self.type = typeof
        self.responsespersec = []
        self.latencypersec = []

    def getfiles(self, directory: str = '.') -> list:
        """
        Returns a list of csv files in directory
        :param directory:
        :return:
        """
        return [(directory + '/' + filename) for filename in os.listdir(directory) if filename.endswith(self.type)]

    def processfile(
            self,
            fname: str,
            shouldprint: bool = False) -> None:
        pass

    def processallfiles(self, directory: str = '.') -> None:
        """
        Process all files in a directory
        :param directory:
        :return:
        """
        files = sorted(self.getfiles(directory), key=keychars)
        for f in files:
            self.processfile(f, False)


class CsvAnalyzer(Analyzer):
    """
    Abstract CSV analyzer
    """

    def __init__(self):
        """
        Init object
        """
        super().__init__()

    def walkresponsepersec(
            self,
            responsepersec: dict,
            shouldprint: bool) -> None:
        """
        Walks through reponsepersec dict
        :param responsepersec:
        :param shouldprint:
        :return:
        """
        for sec in responsepersec:
            if len(responsepersec[sec]) != 0:
                self.responsespersec.append(len(responsepersec[sec]))
                self.latencypersec.append(average(responsepersec[sec]))
                if shouldprint:
                    print(len(responsepersec[sec]))
                    print(average(responsepersec[sec]))


class PingAnalyzer(Analyzer):
    """
    Analyze ping command output.
    """

    def __init__(self):
        """
        Init object
        """
        super().__init__(typeof='.pingtxt')

    def walkresponsepersec(
            self,
            responsepersec: dict,
            shouldprint: bool) -> None:
        """
        Walks through reponsepersec dict
        :param responsepersec:
        :param shouldprint:
        :return:
        """
        for sec in responsepersec:
            if len(responsepersec[sec]) != 0:
                self.responsespersec.append(len(responsepersec[sec]))
                self.latencypersec.append(average(responsepersec[sec]))
                if shouldprint:
                    print(len(responsepersec[sec]))
                    print(average(responsepersec[sec]))

    def processfile(
            self,
            fname,
            shouldprint: bool = False):
        """
        Process a single file.
        :param fname:
        :param shouldprint:
        :return:
        """
        with open(fname, 'r') as f:
            lines = f.readlines()
            responsepersec = {}
            for line in lines:
                try:
                    epoch = float(NUMBERRE.findall(EPOCHRE.findall(line)[0])[0])
                    epoch_time = time.strftime("%H:%M:%S", time.localtime(epoch))
                    delay = float(NUMBERRE.findall(TIMERE.findall(line)[0])[0])
                    if epoch_time not in responsepersec:
                        responsepersec[epoch_time] = []
                    responsepersec[epoch_time].append(delay)
                except Exception as e:
                    print(f"line skipped because {e}")
            self.walkresponsepersec(responsepersec, shouldprint)


class HeyAnalyzer(CsvAnalyzer):
    """
    Analyze hey benchmark output.
    """

    def __init__(self):
        """
        Init object
        """
        super().__init__()

    def processfile(
            self,
            fname,
            shouldprint: bool = False):
        """
        Process a single file.
        :param fname:
        :param shouldprint:
        :return:
        """
        with open(fname, 'r') as f:
            data = csv.reader(f)
            fields = next(data)
            responsepersec = {}
            for row in data:
                items = zip(fields, row)
                item = {}
                for (name, value) in items:
                    item[name] = value.strip()
                sec = int(item['offset'].split('.')[0])
                if sec not in responsepersec:
                    responsepersec[sec] = []
                responsepersec[sec].append(float(item['response-time']))
            self.walkresponsepersec(responsepersec, shouldprint)


class BirbAnalyzer(CsvAnalyzer):
    """
    Analyze Birbnetes benchmark output.
    """

    def __init__(self):
        """
        Init object
        """
        super().__init__()

    def processfile(
            self,
            fname,
            shouldprint: bool = False):
        """
        Process a single file.
        :param fname:
        :param shouldprint:
        :return:
        """
        with open(fname, 'r') as f:
            data = csv.reader(f)
            fields = next(data)
            responsepersec = {}
            for row in data:
                items = zip(fields, row)
                item = {}
                for (name, value) in items:
                    item[name] = value.strip()
                sec = datetime.datetime.strptime(item['mqtt_arrive_time'], '%Y-%m-%dT%H:%M:%S.%f').strftime("%H:%M:%S")
                if sec not in responsepersec:
                    responsepersec[sec] = []
                responsepersec[sec].append(float(item['rtt']))
            self.walkresponsepersec(responsepersec, shouldprint)


class InputAnalyzer(CsvAnalyzer):
    """
    Analyze InputService benchmark output.
    """

    def __init__(self):
        """
        Init object
        """
        super().__init__()

    def processfile(
            self,
            fname,
            shouldprint: bool = False):
        """
        Process a single file.
        :param fname:
        :param shouldprint:
        :return:
        """
        with open(fname, 'r') as f:
            data = csv.reader(f)
            fields = next(data)
            responsepersec = {}
            for row in data:
                items = zip(fields, row)
                item = {}
                for (name, value) in items:
                    item[name] = value.strip()
                sec = datetime.datetime.strptime(item['http_start_time'], '%Y-%m-%dT%H:%M:%S.%f').strftime("%H:%M:%S")
                if sec not in responsepersec:
                    responsepersec[sec] = []
                firetime = datetime.datetime.strptime(item['http_start_time'], '%Y-%m-%dT%H:%M:%S.%f')
                responsearrivetime = datetime.datetime.strptime(item['http_complete_time'],
                                                                "%Y-%m-%dT%H:%M:%S.%f")
                latency = responsearrivetime - firetime
                responsepersec[sec].append(int(latency.total_seconds() * 1000))
            self.walkresponsepersec(responsepersec, shouldprint)


class ChartCreator:
    """
    Create charts automagically
    """

    @staticmethod
    def savetxtplot(csvfile: Analyzer, directory) -> None:
        """
        Save raw data to txt
        :param directory:
        :param csvfile:
        :return:
        """
        with open(os.getenv('TEXTDIR', default='.') + '/' + directory + "-rps.txt", 'w') as f:
            for item in csvfile.responsespersec:
                f.write("%s\n" % item)
        with open(os.getenv('TEXTDIR', default='.') + '/' + directory + "-latency.txt", 'w') as f:
            for item in csvfile.latencypersec:
                f.write("%s\n" % item)

    @staticmethod
    def savecsvplot(csvfile: Analyzer, directory) -> None:
        """
        Save plot of csv file
        :param csvfile:
        :param directory:
        :return:
        """
        pplot.plot(csvfile.responsespersec)
        pplot.title(directory)
        pplot.xlabel("Time (seconds)")
        pplot.ylabel("Response/sec")
        pplot.savefig(
            os.getenv(
                'CHARTDIR',
                default='.') +
            '/' +
            directory +
            "-rps.png")
        pplot.clf()
        pplot.plot(csvfile.latencypersec)
        pplot.title(directory)
        pplot.xlabel("Time (seconds)")
        pplot.ylabel("Response time (milliseconds)")
        pplot.savefig(
            os.getenv(
                'CHARTDIR',
                default='.') +
            '/' +
            directory +
            "-latency.png")
        pplot.clf()

    @staticmethod
    def analyze_hey(abs_directory, directory):
        """
        Analyze hey output
        :param abs_directory:
        :param directory:
        :return:
        """
        hey = HeyAnalyzer()
        hey.processallfiles(abs_directory)
        ChartCreator.savecsvplot(hey, directory)
        ChartCreator.savetxtplot(hey, directory)

    @staticmethod
    def analyze_birb(abs_directory, directory):
        """
        Analyze BirbBench output
        :param abs_directory:
        :param directory:
        :return:
        """
        birb = BirbAnalyzer()
        birb.processallfiles(abs_directory)
        ChartCreator.savecsvplot(birb, directory)
        ChartCreator.savetxtplot(birb, directory)

    @staticmethod
    def analyze_ping(abs_directory, directory):
        """
        Analyze ping command output
        :param abs_directory:
        :param directory:
        :return:
        """
        ping = PingAnalyzer()
        ping.processallfiles(abs_directory)
        ChartCreator.savecsvplot(ping, directory)
        ChartCreator.savetxtplot(ping, directory)

    @staticmethod
    def analyze_input(abs_directory, directory):
        """
        Analyze InputSvc output
        :param abs_directory:
        :param directory:
        :return:
        """
        inputsvc = InputAnalyzer()
        inputsvc.processallfiles(abs_directory)
        ChartCreator.savecsvplot(inputsvc, directory + "input")
        ChartCreator.savetxtplot(inputsvc, directory + "input")

    def doallruns(self):
        """
        Process all directories in repo
        :return:
        """
        dirs = next(os.walk(os.getenv('SEARCHDIR', default='.')))[1]
        for directory in dirs:
            abs_directory = os.getenv(
                'SEARCHDIR', default='.') + '/' + directory
            print(abs_directory)
            if 'HEY' in abs_directory.upper():
                ChartCreator.analyze_hey(abs_directory, directory)
            else:
                ChartCreator.analyze_ping(abs_directory, directory)


if __name__ == "__main__":
    """
    Entry point
    """
    chartcreator = ChartCreator()
    chartcreator.doallruns()