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require "defines"

function init()
  if not glob.deadPlayers then
    -- will be a sparse table (possible nil values)
    glob.deadPlayers = {}
  end
end
game.oninit(init)
game.onload(init)

game.onevent(defines.events.onentitydied, function(event)
  if event.entity.type == "player" then
    -- loop through game.players and find the one without a character
    -- assumes that players won't be in ghost or god mode
    -- aka no spectators.
    for index, player in ipairs(game.players) do
      -- no character AND not already found
      if not player.character and not glob.deadPlayers[index] then
        -- set glob.deadPlayers of their index to a non-nil value (true works)
        glob.deadPlayers[index] = true
        -- don't loop through other players since each entity gets its own event
        break
      end
    end
  end
end)

game.onevent(defines.events.ontick, function(event)
  for playerIndex, value in pairs(glob.deadPlayers) do
    -- get player reference
    local player = game.players[playerIndex]
    -- if they got their character back
    if player.character then
      -- overwrite with the proper one :)
      player.character.force = getProperForce(playerIndex)
      -- mark as completed
      glob.deadPlayers[playerIndex] = nil
    end
  end
end)

game.onevent(defines.events.onplayercreated, function(event)
  game.players[event.playerindex].character.force = getProperForce(event.playerindex)
end)

-- this could be more complicated :)
function getProperForce(index)
  if index % 2 == 0 then
    return game.forces.enemy
  else
    return game.forces.player
  end
end