from django.apps import apps

from .models import State, Workflow


def create_builtin_workflows(sender, **kwargs):
    """
    Receiver function to create a simple and a complex workflow. It is
    connected to the signal django.db.models.signals.post_migrate during
    app loading.
    """
    if Workflow.objects.exists():
        # If there is at least one workflow, then do nothing.
        return

    workflow_1 = Workflow(name="Simple Workflow")
    workflow_1.save(skip_autoupdate=True)
    state_1_1 = State(
        name="submitted",
        workflow=workflow_1,
        allow_create_poll=True,
        allow_support=True,
    )
    state_1_1.save(skip_autoupdate=True)
    state_1_2 = State(
        name="accepted",
        workflow=workflow_1,
        recommendation_label="Acceptance",
        css_class="green",
        merge_amendment_into_final=1,
    )
    state_1_2.save(skip_autoupdate=True)
    state_1_3 = State(
        name="rejected",
        workflow=workflow_1,
        recommendation_label="Rejection",
        css_class="red",
        merge_amendment_into_final=-1,
    )
    state_1_3.save(skip_autoupdate=True)
    state_1_4 = State(
        name="not decided",
        workflow=workflow_1,
        recommendation_label="No decision",
        css_class="grey",
        merge_amendment_into_final=-1,
    )
    state_1_4.save(skip_autoupdate=True)
    state_1_1.next_states.add(state_1_2, state_1_3, state_1_4)
    workflow_1.first_state = state_1_1
    workflow_1.save(skip_autoupdate=True)

    workflow_2 = Workflow(name="Complex Workflow")
    workflow_2.save(skip_autoupdate=True)
    state_2_0 = State(
        name="in progress",
        workflow=workflow_2,
        allow_submitter_edit=True,
        dont_set_identifier=True,
    )
    state_2_0.save(skip_autoupdate=True)
    state_2_1 = State(
        name="submitted",
        workflow=workflow_2,
        allow_support=True,
        dont_set_identifier=True,
    )
    state_2_1.save(skip_autoupdate=True)
    state_2_2 = State(
        name="permitted",
        workflow=workflow_2,
        recommendation_label="Permission",
        allow_create_poll=True,
    )
    state_2_2.save(skip_autoupdate=True)
    state_2_3 = State(
        name="accepted",
        workflow=workflow_2,
        recommendation_label="Acceptance",
        css_class="green",
        merge_amendment_into_final=1,
    )
    state_2_3.save(skip_autoupdate=True)
    state_2_4 = State(
        name="rejected",
        workflow=workflow_2,
        recommendation_label="Rejection",
        css_class="red",
        merge_amendment_into_final=-1,
    )
    state_2_4.save(skip_autoupdate=True)
    state_2_5 = State(
        name="withdrawed",
        workflow=workflow_2,
        css_class="grey",
        merge_amendment_into_final=-1,
    )
    state_2_5.save(skip_autoupdate=True)
    state_2_6 = State(
        name="adjourned",
        workflow=workflow_2,
        recommendation_label="Adjournment",
        css_class="grey",
        merge_amendment_into_final=-1,
    )
    state_2_6.save(skip_autoupdate=True)
    state_2_7 = State(
        name="not concerned",
        workflow=workflow_2,
        recommendation_label="No concernment",
        css_class="grey",
        merge_amendment_into_final=-1,
    )
    state_2_7.save(skip_autoupdate=True)
    state_2_8 = State(
        name="refered to committee",
        workflow=workflow_2,
        recommendation_label="Referral to committee",
        css_class="grey",
        merge_amendment_into_final=-1,
    )
    state_2_8.save(skip_autoupdate=True)
    state_2_9 = State(
        name="needs review",
        workflow=workflow_2,
        css_class="grey",
        merge_amendment_into_final=-1,
    )
    state_2_9.save(skip_autoupdate=True)
    state_2_10 = State(
        name="rejected (not authorized)",
        workflow=workflow_2,
        recommendation_label="Rejection (not authorized)",
        css_class="grey",
        merge_amendment_into_final=-1,
    )
    state_2_10.save(skip_autoupdate=True)
    state_2_0.next_states.add(state_2_1, state_2_5)
    state_2_1.next_states.add(state_2_2, state_2_5, state_2_10)
    state_2_2.next_states.add(
        state_2_3, state_2_4, state_2_5, state_2_6, state_2_7, state_2_8, state_2_9
    )
    workflow_2.first_state = state_2_0
    workflow_2.save(skip_autoupdate=True)


def get_permission_change_data(sender, permissions, **kwargs):
    """
    Yields all necessary collections if 'motions.can_see' permission changes.
    """
    motions_app = apps.get_app_config(app_label="motions")
    for permission in permissions:
        # There could be only one 'motions.can_see' and then we want to return data.
        if (
            permission.content_type.app_label == motions_app.label
            and permission.codename == "can_see"
        ):
            yield from motions_app.get_startup_elements()