#
#   temperature.py
#   
#   Find current temperature of various system components (CPU, motherboard,
#   hard drives, ambient). Detection of motherboard-based temperatures (CPU
#   etc) uses the pysensors library, and produces a similar output to
#   lmsensors. HDD temperatures are obtained from the hddtemp daemon
#   (http://www.guzu.net/linux/hddtemp.php) which was orphaned since 2007. For
#   hddtemp to work, it must be started in daemon mode, either manually or with
#   a unit file. Manually, it would be started like this:
#
#       sudo hddtemp -d /dev/sda /dev/sdb ... /dev/sdX
#

import re
import sensors
import socket, sys
from telnetlib import Telnet
from typing import List, Dict, NamedTuple

from logparse.formatting import *
from logparse.util import readlog
from logparse import config

import logging
logger = logging.getLogger(__name__)

class Drive(NamedTuple):
    path: str
    model: str
    temperature: int
    units: str

class HddtempClient:

    def __init__(self, host: str='127.0.0.1', port: int=7634, timeout: int=10, sep: str='|') -> None:
        self.host = host
        self.port = port
        self.timeout = timeout
        self.sep = sep

    def _parse_drive(self, drive: str) -> Drive:
        try:
            drive_data = drive.split(self.sep)
            return Drive(drive_data[0], drive_data[1], int(drive_data[2]), drive_data[3])
        except Exception as e:
            logger.warning("Error processing drive: {0}".format(str(drive_data)))
            return None

    def _parse(self, data: str) -> List[Drive]:
        line = data.lstrip(self.sep).rstrip(self.sep)   # Remove first/last
        drives = line.split(self.sep * 2)
        parsed_drives = []
        for drive in drives:
            parsed_drive = self._parse_drive(drive)
            if parsed_drive != None:
                parsed_drives.append(parsed_drive)

#        return [self._parse_drive(drive) for drive in drives if drive != None]
#        return list(filter(lambda drive: self._parse_drive(drive), drives))
        return parsed_drives

    def get_drives(self) -> List[Drive]:    # Obtain data from telnet server
        try:
            with Telnet(self.host, self.port, timeout=self.timeout) as tn:
                raw_data = tn.read_all()
            return self._parse(raw_data.decode('ascii'))    # Return parsed data
        except Exception as e:
            logger.warning("Couldn't read data from {0}:{1} - {2}".format(self.host, self.port, str(e)))
            return 1


def parse_log():

    logger.debug("Starting temp section")
    section = Section("temperatures")

    sensors.init()

    systemp = Data("Sys", [])
    coretemp = Data("Cores", [])
    pkgtemp = Data("Processor", [])

    try:
        for chip in sensors.iter_detected_chips():
            for feature in chip:
                if "Core" in feature.label:
                    coretemp.items.append([feature.label, float(feature.get_value())])
                    continue
                if "CPUTIN" in feature.label:
                    pkgtemp.items.append([feature.label, float(feature.get_value())])
                    continue
                if "SYS" in feature.label:
                    systemp.items.append([feature.label, float(feature.get_value())])
                    continue

        logger.debug("Core data is {0}".format(str(coretemp.items)))
        logger.debug("Sys data is {0}".format(str(systemp.items)))
        logger.debug("Pkg data is {0}".format(str(pkgtemp.items)))
        for temp_data in [systemp, coretemp, pkgtemp]:
            logger.debug("Looking at temp data {0}".format(str(temp_data.items)))
            if len(temp_data.items) > 1:
                avg = float(sum(feature[1] for feature in temp_data.items)) / len(temp_data.items)
                logger.debug("Avg temp for {0} is {1} {2}{3}".format(temp_data.subtitle, str(avg), DEG, CEL))
                temp_data.subtitle += " (avg {0}{1}{2})".format(str(avg), DEG, CEL)
                temp_data.items = ["{0}: {1}{2}{3}".format(feature[0], str(feature[1]), DEG, CEL) for feature in temp_data.items]
            else:
                temp_data.items = [str(temp_data.items[0][1]) + DEG + CEL]
            section.append_data(temp_data)

    finally:
        logger.debug("Finished reading onboard temperatures")
        sensors.cleanup()


    # drive temp

    # For this to work, `hddtemp` must be running in daemon mode.
    # Start it like this (bash):   sudo hddtemp -d /dev/sda /dev/sdX...
    
    received = ''
    sumtemp = 0.0 
    data = ""
    hddtemp_data = Data("Disks")
    
    client = HddtempClient(
        host=config.prefs.get("temperatures", "host"),
        port=config.prefs.getint("temperatures", "port"),
        sep=config.prefs.get("temperatures", "separator"),
        timeout=int(config.prefs.get("temperatures", "timeout")))
    drives = client.get_drives()
    logger.debug("Received drive info: " + str(drives))

    for drive in sorted(drives, key=lambda x: x.path):
        if drive.path in config.prefs.get("temperatures", "drives").split():
            sumtemp += drive.temperature
            hddtemp_data.items.append(("{0} ({1})".format(drive.path, drive.model) if config.prefs.getboolean("temperatures", "show-model") else drive.path) + ": {0}{1}{2}".format(drive.temperature, DEG, drive.units))
        else:
            drives.remove(drive)
            logger.debug("Ignoring drive {0} ({1}) due to config".format(drive.path, drive.model))
    logger.debug("Sorted drive info: " + str(drives))

    hddavg = '{0:.1f}{1}{2}'.format(sumtemp/len(drives), DEG, drives[0].units) # use units of first drive
    logger.debug("Sum of temperatures: {}; Number of drives: {}; => Avg disk temp is {}".format(str(sumtemp), str(len(drives)), hddavg)) 
    hddtemp_data.subtitle += " (avg {0}{1}{2})".format(str(hddavg), DEG, CEL)

    logger.debug("Finished processing drive temperatures")
    logger.info("Finished temp section")

    return section