import boto
from boto.exception import EC2ResponseError
import sure  # noqa
from nose.tools import assert_raises

from moto import mock_ec2
from moto.ec2.models import ec2_backend


@mock_ec2
def test_create_and_delete_volume():
    conn = boto.connect_ec2('the_key', 'the_secret')
    volume = conn.create_volume(80, "us-east-1a")

    all_volumes = conn.get_all_volumes()
    all_volumes.should.have.length_of(1)
    all_volumes[0].size.should.equal(80)
    all_volumes[0].zone.should.equal("us-east-1a")

    volume = all_volumes[0]
    volume.delete()

    conn.get_all_volumes().should.have.length_of(0)

    # Deleting something that was already deleted should throw an error
    with assert_raises(EC2ResponseError) as cm:
        volume.delete()
    cm.exception.code.should.equal('InvalidVolume.NotFound')
    cm.exception.status.should.equal(400)
    cm.exception.request_id.should_not.be.none


@mock_ec2
def test_volume_attach_and_detach():
    conn = boto.connect_ec2('the_key', 'the_secret')
    reservation = conn.run_instances('ami-1234abcd')
    instance = reservation.instances[0]
    volume = conn.create_volume(80, "us-east-1a")

    volume.update()
    volume.volume_state().should.equal('available')

    volume.attach(instance.id, "/dev/sdh")

    volume.update()
    volume.volume_state().should.equal('in-use')

    volume.attach_data.instance_id.should.equal(instance.id)

    volume.detach()

    volume.update()
    volume.volume_state().should.equal('available')

    with assert_raises(EC2ResponseError) as cm1:
        volume.attach('i-1234abcd', "/dev/sdh")
    cm1.exception.code.should.equal('InvalidInstanceID.NotFound')
    cm1.exception.status.should.equal(400)
    cm1.exception.request_id.should_not.be.none

    with assert_raises(EC2ResponseError) as cm2:
        conn.detach_volume(volume.id, instance.id, "/dev/sdh")
    cm2.exception.code.should.equal('InvalidAttachment.NotFound')
    cm2.exception.status.should.equal(400)
    cm2.exception.request_id.should_not.be.none

    with assert_raises(EC2ResponseError) as cm3:
        conn.detach_volume(volume.id, 'i-1234abcd', "/dev/sdh")
    cm3.exception.code.should.equal('InvalidInstanceID.NotFound')
    cm3.exception.status.should.equal(400)
    cm3.exception.request_id.should_not.be.none


@mock_ec2
def test_create_snapshot():
    conn = boto.connect_ec2('the_key', 'the_secret')
    volume = conn.create_volume(80, "us-east-1a")

    volume.create_snapshot('a test snapshot')

    snapshots = conn.get_all_snapshots()
    snapshots.should.have.length_of(1)
    snapshots[0].description.should.equal('a test snapshot')

    # Create snapshot without description
    snapshot = volume.create_snapshot()
    conn.get_all_snapshots().should.have.length_of(2)

    snapshot.delete()
    conn.get_all_snapshots().should.have.length_of(1)

    # Deleting something that was already deleted should throw an error
    with assert_raises(EC2ResponseError) as cm:
        snapshot.delete()
    cm.exception.code.should.equal('InvalidSnapshot.NotFound')
    cm.exception.status.should.equal(400)
    cm.exception.request_id.should_not.be.none


@mock_ec2
def test_modify_attribute_blockDeviceMapping():
    """
    Reproduces the missing feature explained at [0], where we want to mock a
    call to modify an instance attribute of type: blockDeviceMapping.

    [0] https://github.com/spulec/moto/issues/160
    """
    conn = boto.connect_ec2('the_key', 'the_secret')

    reservation = conn.run_instances('ami-1234abcd')

    instance = reservation.instances[0]

    instance.modify_attribute('blockDeviceMapping', {'/dev/sda1': True})

    instance = ec2_backend.get_instance(instance.id)
    instance.block_device_mapping.should.have.key('/dev/sda1')
    instance.block_device_mapping['/dev/sda1'].delete_on_termination.should.be(True)