require 'spec_helper'

describe "#lrem(key, count, value)" do
  before do
    @key = 'mock-redis-test:66767'

    %w[99 bottles of beer on the wall
       99 bottles of beer
       take one down
       pass it around
       98 bottles of beer on the wall].reverse.each do |x|
      @redises.lpush(@key, x)
    end
  end

  it "deletes the first count instances of key when count > 0" do
    @redises.lrem(@key, 2, 'bottles')

    @redises.lrange(@key, 0, 8).should == %w[
      99 of beer on the wall
      99 of beer
    ]

    @redises.lrange(@key, -7, -1).should == %w[98 bottles of beer on the wall]
  end

  it "deletes the last count instances of key when count < 0" do
    @redises.lrem(@key, -2, 'bottles')

    @redises.lrange(@key, 0, 9).should == %w[
      99 bottles of beer on the wall
      99 of beer
    ]

    @redises.lrange(@key, -6, -1).should == %w[98 of beer on the wall]
  end

  it "deletes all instances of key when count == 0" do
    @redises.lrem(@key, 0, 'bottles')
    @redises.lrange(@key, 0, -1).grep(/bottles/).should be_empty
  end

  it "returns the number of elements deleted" do
    @redises.lrem(@key, 2, 'bottles').should == 2
  end

  it "returns the number of elements deleted even if you ask for more" do
    @redises.lrem(@key, 10, 'bottles').should == 3
  end

  it "stringifies value" do
    @redises.lrem(@key, 0, 99).should == 2
  end

  it "returns 0 when run against a nonexistent value" do
    @redises.lrem("mock-redis-test:bogus-key", 0, 1).should == 0
  end

  it "returns 0 when run against an empty list" do
    @redises.llen(@key).times { @redises.lpop(@key) } # empty the list
    @redises.lrem(@key, 0, "beer").should == 0
  end

  it "treats non-integer count as 0" do
    @redises.lrem(@key, 'foo', 'bottles').should == 3
    @redises.lrange(@key, 0, -1).grep(/bottles/).should be_empty
  end

  it "removes empty lists" do
    other_key = "mock-redis-test:lrem-#{__LINE__}"

    @redises.lpush(other_key, 'foo')
    @redises.lrem(other_key, 0, 'foo')

    @redises.get(other_key).should be_nil
  end

  it_should_behave_like "a list-only command"
end