#!/usr/bin/env python3
import math
import multiprocessing
import os
from argparse import ArgumentParser

import matplotlib
import pandas as pd
import matplotlib.pyplot as plt

# Using seaborn's style
#plt.style.use('seaborn')

tex_fonts = {
    "pgf.texsystem": "lualatex",
    # "legend.fontsize": "x-large",
    # "figure.figsize": (15, 5),
    "axes.labelsize": 15,  # "small",
    # "axes.titlesize": "x-large",
    "xtick.labelsize": 15,  # "small",
    "ytick.labelsize": 15,  # "small",
    "legend.fontsize": 15,
    "axes.formatter.use_mathtext": True,
    "mathtext.fontset": "dejavusans",
}

#plt.rcParams.update(tex_fonts)


if __name__ == "__main__":
    parser = ArgumentParser()
    parser.add_argument("-s", "--serial_file", required=True, help="Serial csv file.")
    parser.add_argument("-p", "--pcap_csv_folder", required=True, help="PCAP csv folder.")
    parser.add_argument("--save", required=True, help="Location to save pdf file.")
    parser.add_argument(
        "-i",
        "--interval",
        default=10,
        type=int,
        help="Time interval for rolling window.",
    )

    args = parser.parse_args()

    pcap_csv_list = list()
    for filename in os.listdir(args.pcap_csv_folder):
        if filename.endswith(".csv") and "tcp" in filename:
            pcap_csv_list.append(filename)

    counter = 1
    if len(pcap_csv_list) == 0:
        print("No CSV files found.")

    pcap_csv_list.sort(key=lambda x: int(x.split("_")[-1].replace(".csv", "")))

    for csv in pcap_csv_list:

        print("\rProcessing {} out of {} CSVs.\t({}%)\t".format(counter, len(pcap_csv_list), math.floor(counter/len(pcap_csv_list))))

        #try:
        transmission_df = pd.read_csv(
            "{}{}".format(args.pcap_csv_folder, csv),
            dtype=dict(is_retranmission=bool, is_dup_ack=bool),
        )

        transmission_df["datetime"] = pd.to_datetime(transmission_df["datetime"]) - pd.Timedelta(hours=1)
        transmission_df = transmission_df.set_index("datetime")
        transmission_df.index = pd.to_datetime(transmission_df.index)
        transmission_df = transmission_df.sort_index()

        # srtt to [s]
        transmission_df["srtt"] = transmission_df["srtt"].apply(lambda x: x / 10**6)

        # key for columns and level for index
        transmission_df["goodput"] = transmission_df["payload_size"].groupby(pd.Grouper(level="datetime", freq="{}s".format(args.interval))).transform("sum")
        transmission_df["goodput"] = transmission_df["goodput"].apply(
            lambda x: ((x * 8) / args.interval) / 10**6
        )

        transmission_df["goodput_rolling"] = transmission_df["payload_size"].rolling("{}s".format(args.interval)).sum()
        transmission_df["goodput_rolling"] = transmission_df["goodput_rolling"].apply(
            lambda x: ((x * 8) / args.interval) / 10 ** 6
        )

        # set meta values and remove all not needed columns
        cc_algo = transmission_df["congestion_control"].iloc[0]
        cc_algo = cc_algo.upper()
        transmission_direction = transmission_df["direction"].iloc[0]

        #transmission_df = transmission_df.filter(["goodput", "datetime", "ack_rtt", "goodput_rolling", "snd_cwnd"])

        # read serial csv
        serial_df = pd.read_csv(args.serial_file)
        serial_df["datetime"] = pd.to_datetime(serial_df["datetime"]) - pd.Timedelta(hours=1)
        serial_df = serial_df.set_index("datetime")
        serial_df.index = pd.to_datetime(serial_df.index)
        serial_df.sort_index()

        transmission_df = pd.merge_asof(
            transmission_df,
            serial_df,
            tolerance=pd.Timedelta("1s"),
            right_index=True,
            left_index=True,
        )
        transmission_df = transmission_df.rename(columns={"PCID": "lte_pcid", "PCID.1": "nr_pcid"})

        transmission_df.index = transmission_df["arrival_time"]

        # transmission timeline
        scaley = 1.5
        scalex = 1.0
        plt.title("{} with {}".format(transmission_direction, cc_algo))
        fig, ax = plt.subplots(2, 1, figsize=[6.4 * scaley, 4.8 * scalex])
        fig.subplots_adjust(right=0.75)
        fig.suptitle("{} with {}".format(transmission_direction, cc_algo))
        ax0 = ax[0]
        ax1 = ax0.twinx()
        ax2 = ax0.twinx()
        #ax2.spines.right.set_position(("axes", 1.22))

        ax00 = ax[1]
        ax01 = ax00.twinx()

        # Plot vertical lines
        lte_handovers = transmission_df["lte_pcid"].diff().dropna()
        for index, value in lte_handovers.items():
            if value > 0:
                ax00.axvline(index, ymin=0, ymax=1, color="skyblue", label="4G Handover")

        nr_handovers = transmission_df["nr_pcid"].diff().dropna()
        for index, value in nr_handovers.items():
            if value > 0:
                ax00.axvline(index, ymin=0, ymax=1, color="greenyellow", label="5G Handover")

        ax0.plot(transmission_df["snd_cwnd"].dropna(), color="lime", linestyle="dashed", label="cwnd")
        ax1.plot(transmission_df["srtt"].dropna(), color="red", linestyle="dashdot", label="sRTT")
        ax2.plot(transmission_df["goodput_rolling"], color="blue", linestyle="solid", label="goodput")
        ax00.plot(transmission_df["downlink_cqi"].dropna(), color="magenta", linestyle="dotted", label="CQI")
        ax01.plot(transmission_df["DL_bandwidth"].dropna(), color="peru", linestyle="dotted", label="bandwidth")

        ax2.spines.right.set_position(("axes", 1.1))

        ax0.set_ylim(0, 5000)
        ax1.set_ylim(0, 0.3)
        ax2.set_ylim(0, 500)
        ax00.set_ylim(0, 16)
        ax01.set_ylim(0, 21)

        ax00.set_xlabel("arrival time [s]")
        ax2.set_ylabel("Goodput [mbps]")
        ax00.set_ylabel("CQI")
        ax1.set_ylabel("sRTT [s]")
        ax0.set_ylabel("cwnd")
        ax01.set_ylabel("Bandwidth [MHz]")

        fig.legend(loc="lower right")

        plt.savefig("{}{}_plot.pdf".format(args.save, csv.replace(".csv", "")))
        #except Exception as e:
        #    print("Error processing file: {}".format(csv))
        #    print(str(e))
        counter += 1

        plt.close(fig)
        plt.clf()