"""add normalized WarmteLink scalar reading history

Revision ID: 20260822_17_warmtelink_readings
Revises: 20260822_16_dsmr_source_adoption
Create Date: 2026-08-22 00:00:00.000000

The upgrade is additive: existing business rows are neither changed nor
removed.  The downgrade is schema-only and is exercised only on isolated test
databases.
"""

from typing import Sequence, Union

import sqlalchemy as sa
from alembic import op


revision: str = "20260822_17_warmtelink_readings"
down_revision: Union[str, None] = "20260822_16_dsmr_source_adoption"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        "warmtelink_reading",
        sa.Column("id", sa.Integer(), autoincrement=True, nullable=False),
        sa.Column("channel_id", sa.Integer(), nullable=False),
        sa.Column("recorded_at", sa.DateTime(timezone=True), nullable=False),
        sa.Column("received_at", sa.DateTime(timezone=True), nullable=False),
        sa.Column("value", sa.Numeric(precision=15, scale=3), nullable=False),
        sa.Column("unit", sa.String(length=32), nullable=False),
        sa.Column("quality", sa.String(length=32), nullable=False),
        sa.Column("equipment_fingerprint", sa.String(length=64), nullable=False),
        sa.CheckConstraint(
            "quality IN ('valid', 'invalid', 'unverifiable')",
            name="ck_warmtelink_reading_quality",
        ),
        sa.ForeignKeyConstraint(
            ["channel_id"], ["meter_source_channel.id"], ondelete="RESTRICT"
        ),
        sa.PrimaryKeyConstraint("id"),
        sa.UniqueConstraint(
            "channel_id", "recorded_at", name="uq_warmtelink_reading_channel_recorded_at"
        ),
    )
    op.create_index("ix_warmtelink_reading_recorded_at", "warmtelink_reading", ["recorded_at"])


def downgrade() -> None:
    op.drop_index("ix_warmtelink_reading_recorded_at", table_name="warmtelink_reading")
    op.drop_table("warmtelink_reading")