#
#   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 ..formatting import *
from ..util import readlog, resolve
from ..config import * 

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:
                data = tn.read_all()
            return self._parse(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")
    output = writetitle("temperatures")
    output += opentag('div', 1, 'temp', 'section')

    # cpu temp

    sensors.init()
    coretemps = []
    pkgtemp = 0
    systemp = 0
    try:
        for chip in sensors.iter_detected_chips():
            for feature in chip:
                if "Core" in feature.label:
                    coretemps.append([feature.label, feature.get_value()])
                    logger.debug("found core " + feature.label + " at temp " + str(feature.get_value()))
                if "CPUTIN" in feature.label:
                    pkgtemp = str(feature.get_value())
                    logger.debug("found cpu package at temperature " + pkgtemp)
                if "SYS" in feature.label:
                    systemp = feature.get_value()
                    logger.debug("found sys input " + feature.label + " at temp " + str(feature.get_value()))
        logger.debug("Core temp data is: " + str(coretemps))
#        core_avg = reduce(lambda x, y: x[1] + y[1], coretemps) / len(coretemps)
        core_avg = sum(core[1] for core in coretemps) / len(coretemps)
        logger.debug("average cpu temp is " + str(core_avg))
        coretemps.append(["avg", str(core_avg)])
        coretemps.append(["pkg", pkgtemp])
        coretemps = [x[0] + ": " + str(x[1]) + DEG + CEL for x in coretemps]
    finally:
        sensors.cleanup()

    if (systemp != 0):
        output += writedata("sys: " + str(systemp) + DEG)
    if (coretemps != ''):
        output += writedata("cores", coretemps)
    
    logger.info("Finished reading onboard temperatures")

    # 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 = ""
    fields = []
    
    client = HddtempClient(host=config.prefs['hddtemp']['host'], port=int(config.prefs['hddtemp']['port']), sep=config.prefs['hddtemp']['separator'], timeout=int(config.prefs['hddtemp']['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['hddtemp']['drives']:
            sumtemp += drive.temperature
            fields.append(("{0} ({1})".format(drive.path, drive.model) if config.prefs['hddtemp']['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)) 
    fields.append("avg: " + str(hddavg))

    if (config.prefs['hddtemp']['drives'] != ''):
        output += writedata("disks", fields)
    logger.info("Finished processing drive temperatures")


    output += closetag('div', 1)
    logger.info("Finished temp section")
    return output