"""Add active metadata discovery, field lineage and correction audit."""

from alembic import op

revision = "20260730_380"
down_revision = "20260730_370"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.execute(
        """
        CREATE TABLE public.active_metadata_plans (
            uid UUID PRIMARY KEY,
            source_uid UUID NOT NULL REFERENCES public.ingestion_sources(uid),
            name VARCHAR(300) NOT NULL,
            source_kind VARCHAR(20) NOT NULL
                CHECK (source_kind IN ('database','file','api')),
            schedule_type VARCHAR(20) NOT NULL
                CHECK (schedule_type IN ('manual','interval','cron')),
            schedule_expression VARCHAR(120),
            discovery_mode VARCHAR(20) NOT NULL
                CHECK (discovery_mode IN ('snapshot','cursor')),
            scope JSONB NOT NULL,
            cursor_state JSONB NOT NULL DEFAULT '{}'::jsonb,
            owner_uid UUID NOT NULL REFERENCES public.users(id),
            enabled BOOLEAN NOT NULL DEFAULT TRUE,
            current_version INTEGER NOT NULL DEFAULT 1 CHECK (current_version > 0),
            created_by UUID NOT NULL REFERENCES public.users(id),
            created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
            updated_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
            CHECK (jsonb_typeof(scope) = 'object'),
            CHECK (jsonb_typeof(cursor_state) = 'object')
        );

        CREATE TABLE public.active_metadata_runs (
            uid UUID PRIMARY KEY,
            plan_uid UUID NOT NULL REFERENCES public.active_metadata_plans(uid),
            batch_key VARCHAR(160) NOT NULL,
            status VARCHAR(20) NOT NULL CHECK (status IN ('completed','failed')),
            attempt_count INTEGER NOT NULL DEFAULT 1 CHECK (attempt_count > 0),
            cursor_before JSONB NOT NULL,
            cursor_after JSONB NOT NULL,
            snapshot_hash CHAR(64),
            statistics JSONB NOT NULL,
            failure_code VARCHAR(80),
            failure_reason VARCHAR(500),
            actor_uid UUID NOT NULL REFERENCES public.users(id),
            started_at TIMESTAMPTZ NOT NULL,
            finished_at TIMESTAMPTZ NOT NULL,
            created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
            UNIQUE (plan_uid, batch_key),
            CHECK (jsonb_typeof(cursor_before) = 'object'),
            CHECK (jsonb_typeof(cursor_after) = 'object'),
            CHECK (jsonb_typeof(statistics) = 'object')
        );

        CREATE TABLE public.active_metadata_assets (
            uid UUID PRIMARY KEY,
            source_uid UUID NOT NULL REFERENCES public.ingestion_sources(uid),
            asset_key VARCHAR(500) NOT NULL,
            namespace VARCHAR(200) NOT NULL,
            name VARCHAR(200) NOT NULL,
            asset_type VARCHAR(40) NOT NULL,
            lifecycle_status VARCHAR(30) NOT NULL
                CHECK (lifecycle_status IN ('active','deletion_candidate','retired')),
            current_version INTEGER NOT NULL CHECK (current_version > 0),
            content_hash CHAR(64) NOT NULL,
            snapshot JSONB NOT NULL,
            health JSONB NOT NULL DEFAULT '{}'::jsonb,
            last_run_uid UUID NOT NULL REFERENCES public.active_metadata_runs(uid),
            created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
            updated_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
            UNIQUE (source_uid, asset_key),
            CHECK (jsonb_typeof(snapshot) = 'object'),
            CHECK (jsonb_typeof(health) = 'object')
        );

        CREATE TABLE public.active_metadata_asset_versions (
            uid UUID PRIMARY KEY,
            asset_uid UUID NOT NULL REFERENCES public.active_metadata_assets(uid),
            version INTEGER NOT NULL CHECK (version > 0),
            run_uid UUID NOT NULL REFERENCES public.active_metadata_runs(uid),
            content_hash CHAR(64) NOT NULL,
            snapshot JSONB NOT NULL,
            actor_uid UUID NOT NULL REFERENCES public.users(id),
            created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
            UNIQUE (asset_uid, version),
            CHECK (jsonb_typeof(snapshot) = 'object')
        );

        CREATE TABLE public.active_metadata_changes (
            uid UUID PRIMARY KEY,
            run_uid UUID NOT NULL REFERENCES public.active_metadata_runs(uid),
            asset_uid UUID NOT NULL REFERENCES public.active_metadata_assets(uid),
            asset_key VARCHAR(500) NOT NULL,
            field_name VARCHAR(200),
            change_type VARCHAR(40) NOT NULL CHECK (
                change_type IN (
                    'asset_added','field_added','field_changed',
                    'field_deletion_candidate','deletion_candidate'
                )
            ),
            before_state JSONB,
            after_state JSONB,
            status VARCHAR(20) NOT NULL DEFAULT 'pending'
                CHECK (status IN ('pending','accepted','rejected')),
            created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP
        );

        CREATE TABLE public.active_metadata_lineage (
            uid UUID PRIMARY KEY,
            run_uid UUID NOT NULL REFERENCES public.active_metadata_runs(uid),
            parse_status VARCHAR(20) NOT NULL
                CHECK (parse_status IN ('resolved','failed')),
            source_asset VARCHAR(500),
            source_field VARCHAR(200),
            target_asset VARCHAR(500),
            target_field VARCHAR(200),
            relation_type VARCHAR(40) NOT NULL,
            evidence JSONB NOT NULL,
            failure_reason VARCHAR(500),
            created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
            CHECK (jsonb_typeof(evidence) = 'object')
        );

        CREATE TABLE public.active_metadata_health_signals (
            uid UUID PRIMARY KEY,
            asset_uid UUID NOT NULL REFERENCES public.active_metadata_assets(uid),
            run_uid UUID NOT NULL REFERENCES public.active_metadata_runs(uid),
            signal_type VARCHAR(30) NOT NULL CHECK (
                signal_type IN ('quality','freshness','task_failure','usage')
            ),
            value JSONB,
            status VARCHAR(20) NOT NULL
                CHECK (status IN ('healthy','warning','critical','unknown')),
            evidence JSONB NOT NULL,
            observed_at TIMESTAMPTZ NOT NULL,
            created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
            CHECK (jsonb_typeof(evidence) = 'object')
        );

        CREATE TABLE public.active_metadata_corrections (
            uid UUID PRIMARY KEY,
            asset_uid UUID NOT NULL REFERENCES public.active_metadata_assets(uid),
            field_name VARCHAR(200),
            proposed_value JSONB NOT NULL,
            reason VARCHAR(500) NOT NULL,
            assignee_uid UUID NOT NULL REFERENCES public.users(id),
            status VARCHAR(20) NOT NULL
                CHECK (status IN ('pending','resolved','rejected')),
            resolution JSONB NOT NULL DEFAULT '{}'::jsonb,
            current_version INTEGER NOT NULL DEFAULT 1 CHECK (current_version > 0),
            submitted_by UUID NOT NULL REFERENCES public.users(id),
            resolved_by UUID REFERENCES public.users(id),
            created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
            updated_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
            CHECK (jsonb_typeof(proposed_value) = 'object'),
            CHECK (jsonb_typeof(resolution) = 'object')
        );

        CREATE TABLE public.active_metadata_correction_audits (
            uid UUID PRIMARY KEY,
            correction_uid UUID NOT NULL
                REFERENCES public.active_metadata_corrections(uid),
            version INTEGER NOT NULL CHECK (version > 0),
            action VARCHAR(40) NOT NULL,
            before_state JSONB,
            after_state JSONB NOT NULL,
            actor_uid UUID NOT NULL REFERENCES public.users(id),
            created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
            UNIQUE (correction_uid, version),
            CHECK (jsonb_typeof(after_state) = 'object')
        );

        CREATE INDEX idx_active_metadata_plans_enabled
            ON public.active_metadata_plans(enabled, source_kind);
        CREATE INDEX idx_active_metadata_runs_plan_created
            ON public.active_metadata_runs(plan_uid, created_at DESC);
        CREATE INDEX idx_active_metadata_assets_source_status
            ON public.active_metadata_assets(source_uid, lifecycle_status);
        CREATE INDEX idx_active_metadata_changes_run_status
            ON public.active_metadata_changes(run_uid, status, change_type);
        CREATE INDEX idx_active_metadata_lineage_target
            ON public.active_metadata_lineage(target_asset, target_field);
        CREATE INDEX idx_active_metadata_health_asset
            ON public.active_metadata_health_signals(asset_uid, observed_at DESC);
        CREATE INDEX idx_active_metadata_corrections_assignee
            ON public.active_metadata_corrections(assignee_uid, status);
        """
    )


def downgrade() -> None:
    raise RuntimeError(
        "active metadata history is append-only; "
        "downgrade requires an approved archival migration"
    )