#!/usr/bin/env python
# ex:ts=4:sw=4:sts=4:et
# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
#
# Copyright (C) 2014        Alex Damian
#
# This file re-uses code spread throughout other Bitbake source files.
# As such, all other copyrights belong to their own right holders.
#
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.


# This command takes a filename as a single parameter. The filename is read
# as a build eventlog, and the ToasterUI is used to process events in the file
# and log data in the database

from __future__ import print_function
import os
import sys, logging

# mangle syspath to allow easy import of modules
sys.path.insert(0, os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__))),
                                'lib'))


import bb.cooker
from bb.ui import toasterui
import sys
import logging

import json, pickle


class FileReadEventsServerConnection():
    """  Emulates a connection to a bitbake server that feeds
        events coming actually read from a saved log file.
    """

    class MockConnection():
        """ fill-in for the proxy to the server. we just return generic data
        """
        def __init__(self, sc):
            self._sc = sc

        def runCommand(self, commandArray):
            """ emulates running a command on the server; only read-only commands are accepted """
            command_name = commandArray[0]

            if command_name == "getVariable":
                if commandArray[1] in self._sc._variables:
                    return (self._sc._variables[commandArray[1]]['v'], None)
                return (None, "Missing variable")

            elif command_name == "getAllKeysWithFlags":
                dump = {}
                flaglist = commandArray[1]
                for k in self._sc._variables.keys():
                    try:
                        if not k.startswith("__"):
                            v = self._sc._variables[k]['v']
                            dump[k] = {
                                'v' : v ,
                                'history' : self._sc._variables[k]['history'],
                            }
                            for d in flaglist:
                                dump[k][d] = self._sc._variables[k][d]
                    except Exception as e:
                        print(e)
                return (dump, None)
            else:
                raise Exception("Command %s not implemented" % commandArray[0])

        def terminateServer(self):
            """ do not do anything """
            pass



    class EventReader():
        def __init__(self, sc):
            self._sc = sc
            self.firstraise = 0

        def _create_event(self, line):
            def _import_class(name):
                assert len(name) > 0
                assert "." in name, name

                components = name.strip().split(".")
                modulename = ".".join(components[:-1])
                moduleklass = components[-1]

                module = __import__(modulename, fromlist=[str(moduleklass)])
                return getattr(module, moduleklass)

            # we build a toaster event out of current event log line
            try:
                event_data = json.loads(line.strip())
                event_class = _import_class(event_data['class'])
                event_object = pickle.loads(json.loads(event_data['vars']))
            except ValueError as e:
                print("Failed loading ", line)
                raise e

            if not isinstance(event_object, event_class):
                raise Exception("Error loading objects %s class %s ", event_object, event_class)

            return event_object

        def waitEvent(self, timeout):

            nextline = self._sc._eventfile.readline()
            if len(nextline) == 0:
                # the build data ended, while toasterui still waits for events.
                # this happens when the server was abruptly stopped, so we simulate this
                self.firstraise += 1
                if self.firstraise == 1:
                    raise KeyboardInterrupt()
                else:
                    return None
            else:
                self._sc.lineno += 1
            return self._create_event(nextline)


    def _readVariables(self, variableline):
        self._variables = json.loads(variableline.strip())['allvariables']


    def __init__(self, file_name):
        self.connection = FileReadEventsServerConnection.MockConnection(self)
        self._eventfile = open(file_name, "r")

        # we expect to have the variable dump at the start of the file
        self.lineno = 1
        self._readVariables(self._eventfile.readline())

        self.events = FileReadEventsServerConnection.EventReader(self)





class MockConfigParameters():
    """ stand-in for cookerdata.ConfigParameters; as we don't really config a cooker, this
        serves just to supply needed interfaces for the toaster ui to work """
    def __init__(self):
        self.observe_only = True            # we can only read files


# run toaster ui on our mock bitbake class
if __name__ == "__main__":
    if len(sys.argv) < 2:
        print("Usage: %s event.log " % sys.argv[0])
        sys.exit(1)

    file_name = sys.argv[-1]
    mock_connection = FileReadEventsServerConnection(file_name)
    configParams = MockConfigParameters()

    # run the main program and set exit code to the returned value
    sys.exit(toasterui.main(mock_connection.connection, mock_connection.events, configParams))