# -*- coding: UTF-8 -*-

# smart function inspired by py-SMART https://github.com/freenas/py-SMART
# under Copyright (C) 2015 Marc Herndon and GPL2

"""Displays HDD smart status of different drives or all drives

Parameters:
    * smartstatus.display: how to display (defaults to 'combined', other choices: 'seperate' or 'singles')
    * smartstauts.drives: in the case of singles which drives to display, separated comma list value, multiple accepted (defaults to 'sda', example:'sda,sdc')
"""

import os

import shutil

import core.module
import core.widget
import core.decorators

import util.cli

class Module(core.module.Module):
    @core.decorators.every(minutes=5)
    def __init__(self, config, theme):
        super().__init__(config, theme, [])

        self.devices = self.list_devices()
        self.display = self.parameter('display', 'combined')
        self.drives = self.parameter('drives', 'sda')
        self.widgets(self.create_widgets())

    def create_widgets(self):
        widgets = []
        if self.display == 'combined':
            widget = core.widget.Widget()
            widget.set('device', 'combined')
            widget.set('assessment', self.combined())
            self.output(widget)
            widgets.append(widget)
        else:
            for device in self.devices:
                if self.display == 'singles' and device not in self.drives:
                    continue
                widget = core.widget.Widget()
                widget.set('device', device)
                widget.set('assessment', self.smart(device))
                self.output(widget)
                widgets.append(widget)
        return widgets

    def update(self):
        for widget in self.widgets():
            device = widget.get('device')
            if device == 'combined':
                widget.set('assessment', self.combined())
                self.output(widget)
            else:
                widget.set('assessment', self.smart(device))
                self.output(widget)

    def output(self, widget):
        device = widget.get('device')
        assessment = widget.get('assessment')
        widget.full_text('{}: {}'.format(device, assessment))

    def state(self, widget):
        states = []
        assessment = widget.get('assessment')
        if assessment == 'Pre-fail':
            states.append('warning')
        if assessment == 'Fail':
            states.append('critical')
        return states

    def combined(self):
        for device in self.devices:
            result = self.smart(device)
            if result == 'Fail':
                return 'Fail'
            if result == 'Pre-fail':
                return 'Pre-fail'
        return 'OK'

    def list_devices(self):
        for (root, folders, files) in os.walk('/dev'):
            if root == '/dev':
                devices = {''.join(filter(lambda i: i.isdigit() == False, file)) for file in files if 'sd' in file}
                nvme = {file for file in files if('nvme0n' in file and 'p' not in file)}
                devices.update(nvme)
                return devices

    def smart(self, disk_name):
        smartctl = shutil.which('smartctl')
        assessment = None

        output = util.cli.execute('sudo {} --health {}'.format(
            smartctl, os.path.join('/dev/', disk_name)
        ))
        output = output.split('\n')
        line = output[4]
        if 'SMART' in line:
            if any([i in line for i in ['PASSED', 'OK']]):
                assessment = 'OK'
            else:
                assessment = 'Fail'

        if assessment == 'OK':
            output = util.cli.execute('sudo {} -A {}'.format(
                smartctl, os.path.join('/dev/', disk_name)
            ))
            output = output.split('\n')
            for line in output:
                if 'Pre-fail' in line:
                    assessment = 'Pre-fail'
        return assessment

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