#!/usr/bin/env python2
#
# Copyright (C) Microsoft Corporation, All rights reserved.

"""Stream handler module. Is used to process output from stdout and stderr"""

import codecs
import traceback
from threading import Thread

import jrdsclient
import tracer

PREFIX_DEBUG = "DEBUG:"
PREFIX_ERROR = "ERROR:"
PREFIX_VERBOSE = "VERBOSE:"
PREFIX_WARNING = "WARNING:"

STREAM_TYPE_DEBUG = "Debug"
STREAM_TYPE_ERROR = "Error"
STREAM_TYPE_OUTPUT = "Output"
STREAM_TYPE_VERBOSE = "Verbose"
STREAM_TYPE_WARNING = "Warning"


class StreamHandler(Thread):
    """Stream handler class."""

    def __init__(self, job_data, runtime_process, jrds_client):
        """
        :type job_data: jrdsclient.JobData
        :type runtime_process :
        :type jrds_client : jrdsclient.JRDSClient
        """
        Thread.__init__(self)
        self.daemon = True
        self.job_data = job_data
        self.runtime_process = runtime_process
        self.jrds_client = jrds_client

    def get_job_extended_properties(self):
        return {
            'accountid': str(self.job_data.account_id),
            'accountname': str(self.job_data.account_name),
            'trackingid': str(self.job_data.tracking_id),
            'jobid': str(self.job_data.job_id),
            'resourcegroup': str(self.job_data.resource_group_name),
            'runbookname': str(self.job_data.runbook_name),
            'subscriptionid': str(self.job_data.subscription_id),
            'runon': str(self.job_data.run_on)
        }

    def run(self):
        """Monitor the job's subprocess for output (which will be uploaded as streams).

        Notes:
        PowerShell stdout : http://stackoverflow.com/questions/22349139/utf-8-output-from-powershell

        IMPORTANT: Do not log streams to cloud.
        """
        stream_count = 0
        while True:
            try:
                output = codecs.getwriter('utf8')(self.runtime_process.stdout).readline()
                error_output = codecs.getwriter('utf8')(self.runtime_process.stderr).readline()
                if output == '' and error_output == '' and self.runtime_process.poll() is not None:
                    break
                if output:
                    if output.startswith(PREFIX_DEBUG.lower()) or \
                            output.startswith(PREFIX_DEBUG.upper()) or \
                            output.startswith(PREFIX_DEBUG.capitalize()):
                        self.process_debug_stream(stream_count, output)
                    elif output.startswith(PREFIX_ERROR.lower()) or \
                            output.startswith(PREFIX_ERROR.upper()) or \
                            output.startswith(PREFIX_ERROR.capitalize()):
                        self.process_error_stream(stream_count, output)
                    elif output.startswith(PREFIX_VERBOSE.lower()) or \
                            output.startswith(PREFIX_VERBOSE.upper()) or \
                            output.startswith(PREFIX_VERBOSE.capitalize()):
                        self.process_verbose_stream(stream_count, output)
                    elif output.startswith(PREFIX_WARNING.lower()) or \
                            output.startswith(PREFIX_WARNING.upper()) or \
                            output.startswith(PREFIX_WARNING.capitalize()):
                        self.process_warning_stream(stream_count, output)
                    else:
                        self.process_output_stream(stream_count, output)
                    stream_count += 1

                    # leave trace at the end to prevent encoding issue from pushing streams to cloud
                    # leave this as debug trace to prevent logging customer streams to automation logs
                    tracer.log_debug_trace("STDOUT : " + str(output.strip()))
                if error_output:
                    self.process_error_stream(stream_count, error_output)
                    stream_count += 1
                    tracer.log_debug_trace("STDERR : " + str(error_output.strip()))
            except:
                tracer.log_sandbox_job_streamhandler_unhandled_exception(self.job_data.job_id, traceback.format_exc())
                continue
        tracer.log_sandbox_job_streamhandler_processing_complete(self.job_data.job_id)

    def process_debug_stream(self, stream_count, output):
        self.set_stream(stream_count, STREAM_TYPE_DEBUG, output)
        pass

    def process_error_stream(self, stream_count, output):
        self.set_stream(stream_count, STREAM_TYPE_ERROR, output)
        pass

    def process_output_stream(self, stream_count, output):
        self.set_stream(stream_count, STREAM_TYPE_OUTPUT, output)
        pass

    def process_verbose_stream(self, stream_count, output):
        self.set_stream(stream_count, STREAM_TYPE_VERBOSE, output)
        pass

    def process_warning_stream(self, stream_count, output):
        self.set_stream(stream_count, STREAM_TYPE_WARNING, output)
        pass

    def set_stream(self, stream_count, stream_type, output):
        self.jrds_client.set_stream(self.job_data.job_id, self.job_data.runbook_version_id, output.strip(),
                                    stream_type, stream_count, self.get_job_extended_properties())