"""Anbindung an Banken ueber PSD2 (Enable Banking).

Drei Ebenen: die bei Enable Banking registrierte Anwendung dieser Installation
(Application ID + privater Schluessel), die autorisierte Verbindung zu einer
Bank, und die Zuordnung eines dortigen Kontos zu einem Konto in Certain.

Der private Schluessel liegt verschluesselt – er ist so schuetzenswert wie ein
Passwort, denn mit ihm wird jede Anfrage signiert.

Revision ID: 0021
Revises: 0020
"""

import sqlalchemy as sa
from alembic import op

revision = "0021"
down_revision = "0020"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.create_table(
        "bank_apps",
        sa.Column("id", sa.Integer(), primary_key=True),
        sa.Column("owner_id", sa.Integer(), nullable=False),
        sa.Column("application_id", sa.String(length=64), nullable=False),
        sa.Column("private_key_enc", sa.Text(), nullable=False),
        sa.Column("base_url", sa.String(length=255), nullable=False),
        sa.Column("created_at", sa.DateTime(timezone=True), nullable=True),
        sa.ForeignKeyConstraint(["owner_id"], ["users.id"], ondelete="CASCADE"),
    )
    op.create_index("ix_bank_apps_owner_id", "bank_apps", ["owner_id"])

    op.create_table(
        "bank_connections",
        sa.Column("id", sa.Integer(), primary_key=True),
        sa.Column("owner_id", sa.Integer(), nullable=False),
        sa.Column("aspsp_name", sa.String(length=120), nullable=False),
        sa.Column("aspsp_country", sa.String(length=2), nullable=False),
        sa.Column("session_id", sa.String(length=64), nullable=True),
        sa.Column("valid_until", sa.DateTime(timezone=True), nullable=True),
        sa.Column("pending_state", sa.String(length=64), nullable=True),
        sa.Column("last_sync_at", sa.DateTime(timezone=True), nullable=True),
        sa.Column("last_error", sa.Text(), nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), nullable=True),
        sa.ForeignKeyConstraint(["owner_id"], ["users.id"], ondelete="CASCADE"),
    )
    op.create_index("ix_bank_connections_owner_id", "bank_connections", ["owner_id"])
    op.create_index("ix_bank_connections_state", "bank_connections", ["pending_state"])

    op.create_table(
        "bank_account_links",
        sa.Column("id", sa.Integer(), primary_key=True),
        sa.Column("owner_id", sa.Integer(), nullable=False),
        sa.Column("connection_id", sa.Integer(), nullable=False),
        sa.Column("remote_uid", sa.String(length=64), nullable=False),
        sa.Column("iban", sa.String(length=64), nullable=True),
        sa.Column("remote_name", sa.String(length=255), nullable=True),
        sa.Column("currency", sa.String(length=3), nullable=False, server_default="EUR"),
        sa.Column("account_id", sa.Integer(), nullable=True),
        sa.Column("created_at", sa.DateTime(timezone=True), nullable=True),
        sa.ForeignKeyConstraint(["owner_id"], ["users.id"], ondelete="CASCADE"),
        sa.ForeignKeyConstraint(["connection_id"], ["bank_connections.id"], ondelete="CASCADE"),
        sa.ForeignKeyConstraint(["account_id"], ["accounts.id"], ondelete="SET NULL"),
        sa.UniqueConstraint("owner_id", "remote_uid", name="uq_bank_link_remote"),
    )
    op.create_index("ix_bank_links_owner_id", "bank_account_links", ["owner_id"])
    op.create_index("ix_bank_links_connection", "bank_account_links", ["connection_id"])


def downgrade() -> None:
    op.drop_table("bank_account_links")
    op.drop_table("bank_connections")
    op.drop_table("bank_apps")