from formity.extensions import admin, db, ModelView
from formity.models import FaceshieldRequest, RequestChange
from spaceauth import current_user
import enum
from sqlalchemy import inspect
from sqlalchemy.orm import class_mapper
from sqlalchemy.orm.attributes import get_history

def get_diff(target, blacklist=['created', 'updated']):
    state_before = {}
    state_after = {}
    inspr = inspect(target)
    attrs = class_mapper(target.__class__).column_attrs
    for attr in attrs:
        if attr.key in blacklist:
            continue

        hist = getattr(inspr.attrs, attr.key).history
        if hist.has_changes():
            state_before[attr.key] = get_history(target, attr.key)[2].pop()
            if isinstance(state_before[attr.key], enum.Enum):
                state_before[attr.key] = state_before[attr.key].name
            state_after[attr.key] = getattr(target, attr.key)

            if state_after[attr.key] == state_before[attr.key] or (state_after[attr.key] in ['', None] and state_before[attr.key] in ['', None]):
                state_after.pop(attr.key)
                state_before.pop(attr.key)

    return state_before, state_after


class FaceshieldRequestAdmin(ModelView):
    details_modal_template = 'changelog_details_modal.html'
    edit_template = 'changelog_edit.html'

    column_searchable_list = ('email', 'remarks', 'extra', 'entity_info', 'full_name')
    column_filters = (
        'entity_info', 'full_name', 'phone_number', 'email', 'extra',
        'faceshield_front_required', 'faceshield_model',
        'faceshield_full_required',
        'created', 'ua', 'ip', 'status', 'remarks',
    )

    column_export_list = ['id', *column_filters]

    column_list = ('id', 'entity_info', 'full_name', 'faceshield_front_required', 'faceshield_full_required', 'created', 'status')
    column_editable_list = ('status', 'remarks')

    can_delete = False
    can_view_details = True
    details_modal = True
    can_export = True
    can_set_page_size = True

    def on_model_change(self, form, model, is_created):
        if is_created:
            return

        try:
            before, after = get_diff(model)
        except Exception:
            # xD
            before, after = {'diff': 'failed'}, {'diff': 'failed'}

        if before or after:
            db.session.add(RequestChange(
                user_id=current_user.get_id() or 'nobody',
                request_id=model.id,
                state_before=before,
                state_after=after,
            ))


admin.add_view(FaceshieldRequestAdmin(FaceshieldRequest, db.session))