"""Adopt the App queue contract and migrate legacy mappings.

Revision ID: 0002_app_queue_contract
Revises: 0001_bitrix_sync_full
Create Date: 2026-08-06
"""

from collections.abc import Sequence

from alembic import op

revision: str = "0002_app_queue_contract"
down_revision: str | None = "0001_bitrix_sync_full"
branch_labels: str | Sequence[str] | None = None
depends_on: str | Sequence[str] | None = None


def upgrade() -> None:
    op.execute(
        """
        DO $$
        BEGIN
          IF to_regclass('han_app.entity_external_mapping') IS NOT NULL THEN
            EXECUTE $copy$
              INSERT INTO bitrix_sync.entity_external_mapping
                (id,entity_type,entity_id,external_system,external_entity_type,
                 external_id,status,opened_at,closed_at,close_reason,created_at,updated_at)
              SELECT id,entity_type,entity_id,'bitrix24','contact',
                     external_id,'active',coalesce(created_at,now()),NULL,NULL,
                     coalesce(created_at,now()),coalesce(created_at,now())
              FROM han_app.entity_external_mapping
              ON CONFLICT DO NOTHING
            $copy$;
            IF EXISTS (
              SELECT 1 FROM han_app.entity_external_mapping old
              LEFT JOIN bitrix_sync.entity_external_mapping new ON new.id=old.id
              WHERE new.id IS NULL
            ) THEN
              RAISE EXCEPTION 'legacy mapping migration verification failed';
            END IF;
          END IF;
        END $$;
        """
    )

    op.execute(
        """
        INSERT INTO bitrix_sync.settings_versions
          (id,version,validation_status,active,created_by,created_at,activated_at)
        VALUES ('00000000-0000-0000-0000-000000000001',1,'valid',true,'migration',now(),now())
        ON CONFLICT DO NOTHING
        """
    )
    op.execute(
        """
        INSERT INTO bitrix_sync.settings
          (id,version_id,key,value_type,value_json,validation_status,active,created_at,updated_at)
        VALUES
          (gen_random_uuid(),'00000000-0000-0000-0000-000000000001','worker','object',
           jsonb_build_object(
             'batch_size',20,'batch_wait_ms',200,'claim_size',20,'lease_seconds',60,
             'limiter_refill_per_sec',2,'limiter_burst',2,'max_in_flight',2,
             'retry_base_seconds',1,'retry_max_seconds',900,'retry_horizon_seconds',86400
           ),
           'valid',true,now(),now()),
          (gen_random_uuid(),'00000000-0000-0000-0000-000000000001','reconciliation','object',
           jsonb_build_object(
             'contact_interval_seconds',900,'alert_interval_seconds',3600,
             'overlap_seconds',300,'recovered_spike_threshold',20
           ),
           'valid',true,now(),now()),
          (gen_random_uuid(),'00000000-0000-0000-0000-000000000001','business_alerts','object',
           jsonb_build_object(
             'entity_type_id',NULL,'category_id',NULL,'stage_new',NULL,
             'stage_in_progress',NULL,'stage_resolved',NULL,
             'stage_closed_without_resolution',NULL,'sla_business_hours',8
           ),
           'valid',true,now(),now())
        ON CONFLICT DO NOTHING;
        """
    )


def downgrade() -> None:
    raise RuntimeError("App queue contract migration is forward-only")