# -*- coding: utf-8 -*-
# Copyright 2019 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Tools for recording and reporting timeline of benchmark_run."""


__author__ = "yunlian@google.com (Yunlian Jiang)"

import time


class Event(object):
    """One event on the timeline."""

    def __init__(self, name="", cur_time=0):
        self.name = name
        self.timestamp = cur_time


class Timeline(object):
    """Use a dict to store the timeline."""

    def __init__(self):
        self.events = []

    def Record(self, event):
        for e in self.events:
            assert e.name != event, "The event {0} is already recorded.".format(
                event
            )
        cur_event = Event(name=event, cur_time=time.time())
        self.events.append(cur_event)

    def GetEvents(self):
        return [e.name for e in self.events]

    def GetEventDict(self):
        tl = {}
        for e in self.events:
            tl[e.name] = e.timestamp
        return tl

    def GetEventTime(self, event):
        for e in self.events:
            if e.name == event:
                return e.timestamp
        raise IndexError("The event {0} is not recorded".format(event))

    def GetLastEventTime(self):
        return self.events[-1].timestamp

    def GetLastEvent(self):
        return self.events[-1].name