"""update apps and add 'user' and 'no access' role

Revision ID: b514cca2d47b
Revises: 5f462d2d9d25
Create Date: 2022-06-08 17:24:51.305129

"""
from alembic import op
import sqlalchemy as sa

# revision identifiers, used by Alembic.
revision = 'b514cca2d47b'
down_revision = '5f462d2d9d25'
branch_labels = None
depends_on = None


def upgrade():
    # ### end Alembic commands ###

    # Check and update app table in DB
    apps = {
        "dashboard": "Dashboard",
        "wekan": "Wekan",
        "wordpress": "WordPress",
        "nextcloud": "Nextcloud",
        "zulip": "Zulip"
    }
    # app table
    app_table = sa.table('app', sa.column('id', sa.Integer), sa.column(
        'name', sa.String), sa.column('slug', sa.String))

    existing_apps = op.get_bind().execute(app_table.select()).fetchall()
    existing_app_slugs = [app['slug'] for app in existing_apps]
    for app_slug in apps.keys():
        if app_slug in existing_app_slugs:
            op.execute(f'UPDATE app SET `name` = "{apps.get(app_slug)}" WHERE slug = "{app_slug}"')
        else:
            op.execute(f'INSERT INTO app (`name`, slug) VALUES ("{apps.get(app_slug)}","{app_slug}")')

    # Fetch all apps including newly created
    existing_apps = op.get_bind().execute(app_table.select()).fetchall()
    # Insert role "user" as ID 2
    op.execute("INSERT INTO `role` (id, `name`) VALUES (2, 'user')")
    # Insert role "no access" as ID 3
    op.execute("INSERT INTO `role` (id, `name`) VALUES (3, 'no access')")
    # Set role_id 2 to all current "user" users which by have NULL role ID
    op.execute("UPDATE app_role SET role_id = 2 WHERE role_id IS NULL")

    # Add 'no access' role for all users that don't have any roles for specific apps
    app_roles_table = sa.table('app_role', sa.column('user_id', sa.String), sa.column(
        'app_id', sa.Integer), sa.column('role_id', sa.Integer))
    
    app_ids = [app['id'] for app in existing_apps]
    app_roles = op.get_bind().execute(app_roles_table.select()).fetchall()
    user_ids = set([app_role['user_id'] for app_role in app_roles])

    for user_id in user_ids:
        existing_user_app_ids = [x['app_id'] for x in list(filter(lambda role: role['user_id'] == user_id, app_roles))]
        missing_user_app_ids = [x for x in app_ids if x not in existing_user_app_ids]

        if len(missing_user_app_ids) > 0:
            values = [{'user_id': user_id, 'app_id': app_id, 'role_id': 3} for app_id in missing_user_app_ids]
            op.bulk_insert(app_roles_table, values)


def downgrade():
    # Revert all users role_id to NULL where role is 'user'
    op.execute("UPDATE app_role SET role_id = NULL WHERE role_id = 2")
    # Delete role 'user' from roles
    op.execute("DELETE FROM `role` WHERE id = 2")

    # Delete all user app roles where role is 'no access' with role_id 3
    op.execute("DELETE FROM app_role WHERE role_id = 3")
    # Delete role 'no access' from roles
    op.execute("DELETE FROM `role` WHERE id = 3")