text: # MIT License
  #
  # Copyright (c) 2018 Evgeny Medvedev, evge.medvedev@gmail.com
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in all
  # copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  
  
  from datetime import datetime, timezone
  
  from celoetl.service.graph_operations import GraphOperations, OutOfBoundsError, Point
  
  
  class EthService(object):
      def __init__(self, web3):
          graph = BlockTimestampGraph(web3)
          self._graph_operations = GraphOperations(graph)
  
      def get_block_range_for_date(self, date):
          start_datetime = datetime.combine(date, datetime.min.time().replace(tzinfo=timezone.utc))
          end_datetime = datetime.combine(date, datetime.max.time().replace(tzinfo=timezone.utc))
          return self.get_block_range_for_timestamps(start_datetime.timestamp(), end_datetime.timestamp())
  
      def get_block_range_for_timestamps(self, start_timestamp, end_timestamp):
          start_timestamp = int(start_timestamp)
          end_timestamp = int(end_timestamp)
          if start_timestamp > end_timestamp:
              raise ValueError('start_timestamp must be greater or equal to end_timestamp')
  
          try:
              start_block_bounds = self._graph_operations.get_bounds_for_y_coordinate(start_timestamp)
          except OutOfBoundsError:
              start_block_bounds = (0, 0)
  
          try:
              end_block_bounds = self._graph_operations.get_bounds_for_y_coordinate(end_timestamp)
          except OutOfBoundsError as e:
              raise OutOfBoundsError('The existing blocks do not completely cover the given time range') from e
  
          if start_block_bounds == end_block_bounds and start_block_bounds[0] != start_block_bounds[1]:
              raise ValueError('The given timestamp range does not cover any blocks')
  
          start_block = start_block_bounds[1]
          end_block = end_block_bounds[0]
  
          # The genesis block has timestamp 0 but we include it with the 1st block.
          if start_block == 1:
              start_block = 0
  
          return start_block, end_block
  
  
  class BlockTimestampGraph(object):
      def __init__(self, web3):
          self._web3 = web3
  
      def get_first_point(self):
          # Ignore the genesis block as its timestamp is 0
          return block_to_point(self._web3.eth.getBlock(1))
  
      def get_last_point(self):
          return block_to_point(self._web3.eth.getBlock('latest'))
  
      def get_point(self, x):
          return block_to_point(self._web3.eth.getBlock(x))
  
  
  def block_to_point(block):
      return Point(block.number, block.timestamp)
  