"""PostgreSQL persistence for durable operational tasks."""
from __future__ import annotations

from contextlib import asynccontextmanager
from datetime import datetime
from typing import Any

from psycopg import AsyncConnection
from psycopg.errors import UndefinedTable
from psycopg.types.json import Jsonb
from uuid import uuid4

from app.domain.domain_errors import DomainError
from app.infra.db.postgresql.workbench_events import lock_event_transaction
from app.infra.db.postgresql.workbench_events import WorkbenchEventRepository


class OperationalTaskRepository:
    def __init__(self, connection: AsyncConnection, project_id):
        self.connection = connection
        self.project_id = str(project_id)

    @asynccontextmanager
    async def transaction(self):
        try:
            async with self.connection.transaction():
                await lock_event_transaction(self.connection)
                yield self
        except UndefinedTable as exc:
            raise DomainError(
                "DEPENDENCY_UNAVAILABLE",
                "Project operational-task storage is not provisioned",
                status=503,
            ) from exc

    async def lock(self, key: str) -> None:
        await self.connection.execute(
            "SELECT pg_advisory_xact_lock(hashtextextended(%s, 0))",
            (f"tjwater-operational:{self.project_id}:{key}",),
        )

    async def try_lock(self, key: str) -> bool:
        cursor = await self.connection.execute(
            "SELECT pg_try_advisory_xact_lock(hashtextextended(%s, 0)) AS acquired",
            (f"tjwater-operational:{self.project_id}:{key}",),
        )
        return bool((await cursor.fetchone())["acquired"])

    async def get_request(self, scope: str, request_id: str) -> dict | None:
        cursor = await self.connection.execute(
            """SELECT request_digest,response
               FROM workbench.operational_task_requests
               WHERE project_id=%s AND scope=%s AND request_id=%s""",
            (self.project_id, scope, request_id),
        )
        row = await cursor.fetchone()
        return dict(row) if row else None

    async def save_request(
        self, scope: str, request_id: str, request_digest: str, response: dict
    ) -> None:
        cursor = await self.connection.execute(
            """INSERT INTO workbench.operational_task_requests
               (project_id,scope,request_id,request_digest,response)
               VALUES (%s,%s,%s,%s,%s)
               ON CONFLICT(project_id,scope,request_id) DO UPDATE SET
                 response=excluded.response
               WHERE operational_task_requests.request_digest=excluded.request_digest""",
            (self.project_id, scope, request_id, request_digest, Jsonb(response)),
        )
        if cursor.rowcount != 1:
            raise DomainError(
                "IDEMPOTENCY_CONFLICT",
                "request_id was used with different content",
                status=409,
            )

    async def get_task(self, task_id: str) -> dict | None:
        cursor = await self.connection.execute(
            """SELECT document FROM workbench.operational_tasks
               WHERE project_id=%s AND task_id=%s""",
            (self.project_id, task_id),
        )
        row = await cursor.fetchone()
        return row["document"] if row else None

    async def get_active_run(self, task_id: str) -> dict | None:
        cursor = await self.connection.execute(
            """SELECT run_id,task_id,generation,execution_request_id,status,revision,
                      agent_session_id,lease_expires_at,heartbeat_at,started_at,finished_at,
                      failure_code,failure_detail,dispatch_attempts,next_dispatch_at,
                      created_at,updated_at
               FROM workbench.operational_task_runs
               WHERE project_id=%s AND task_id=%s
                 AND status IN ('queued','claimed','running')
               ORDER BY generation DESC LIMIT 1""",
            (self.project_id, task_id),
        )
        row = await cursor.fetchone()
        return dict(row) if row else None

    async def get_run(self, run_id: str) -> dict | None:
        cursor = await self.connection.execute(
            """SELECT run_id,task_id,generation,execution_request_id,status,revision,
                      agent_session_id,lease_expires_at,heartbeat_at,started_at,finished_at,
                      failure_code,failure_detail,dispatch_attempts,next_dispatch_at,
                      created_at,updated_at
               FROM workbench.operational_task_runs
               WHERE project_id=%s AND run_id=%s""",
            (self.project_id, run_id),
        )
        row = await cursor.fetchone()
        return dict(row) if row else None

    async def list_task_runs(self, task_id: str, limit: int, offset: int) -> list[dict]:
        cursor = await self.connection.execute(
            """SELECT * FROM workbench.operational_task_runs
               WHERE project_id=%s AND task_id=%s
               ORDER BY generation DESC LIMIT %s OFFSET %s""",
            (self.project_id, task_id, limit, offset),
        )
        return [{key: value for key, value in row.items() if key != "project_id"}
                for row in await cursor.fetchall()]

    async def get_latest_run(self, task_id: str) -> dict | None:
        rows = await self.list_task_runs(task_id, 1, 0)
        return rows[0] if rows else None

    async def require_execution_storage(self) -> None:
        """Reject claims before changing state if the inbox cannot be used."""
        cursor = await self.connection.execute(
            "SELECT to_regclass('workbench.agent_messages') IS NOT NULL AS available"
        )
        if not (await cursor.fetchone())["available"]:
            raise DomainError(
                "DEPENDENCY_UNAVAILABLE",
                "Agent message storage is not provisioned; apply "
                "resources/sql/024_agent_messages.sql to this project database before starting runs",
                status=503,
            )

    async def pending_run_messages(self, run_id: str) -> list[str]:
        cursor = await self.connection.execute(
            """SELECT message_id FROM workbench.agent_messages
               WHERE project_id=%s AND run_id=%s AND direction='to_task'
                 AND status IN ('pending','enqueued') ORDER BY created_at LIMIT 100""",
            (self.project_id, run_id),
        )
        return [str(row["message_id"]) for row in await cursor.fetchall()]

    async def fail_run_messages(self, run_id: str, failure_detail: str, now: datetime) -> None:
        await self.connection.execute(
            """UPDATE workbench.agent_messages SET status='failed',failure_detail=%s,updated_at=%s
               WHERE project_id=%s AND run_id=%s AND direction='to_task'
                 AND status IN ('pending','enqueued')""",
            (failure_detail, now, self.project_id, run_id),
        )

    async def insert_run(self, run: dict) -> None:
        await self.connection.execute(
            """INSERT INTO workbench.operational_task_runs
               (project_id,run_id,task_id,generation,execution_request_id,status,revision,
                agent_session_id,lease_expires_at,heartbeat_at,started_at,finished_at,
                failure_code,failure_detail,dispatch_attempts,next_dispatch_at,
                created_at,updated_at)
               VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)""",
            (
                self.project_id, run["run_id"], run["task_id"], run["generation"],
                run["execution_request_id"], run["status"], run["revision"],
                run.get("agent_session_id"), run.get("lease_expires_at"),
                run.get("heartbeat_at"), run.get("started_at"), run.get("finished_at"),
                run.get("failure_code"), run.get("failure_detail"),
                run.get("dispatch_attempts", 0), run["next_dispatch_at"],
                run["created_at"], run["updated_at"],
            ),
        )

    async def update_run(self, run: dict, expected_revision: int) -> None:
        cursor = await self.connection.execute(
            """UPDATE workbench.operational_task_runs SET
                 status=%s,revision=%s,agent_session_id=%s,lease_expires_at=%s,
                 heartbeat_at=%s,started_at=%s,finished_at=%s,failure_code=%s,
                 failure_detail=%s,dispatch_attempts=%s,next_dispatch_at=%s,updated_at=%s
               WHERE project_id=%s AND run_id=%s AND revision=%s""",
            (
                run["status"], run["revision"], run.get("agent_session_id"),
                run.get("lease_expires_at"), run.get("heartbeat_at"),
                run.get("started_at"), run.get("finished_at"), run.get("failure_code"),
                run.get("failure_detail"), run.get("dispatch_attempts", 0),
                run["next_dispatch_at"], run["updated_at"], self.project_id,
                run["run_id"], expected_revision,
            ),
        )
        if cursor.rowcount != 1:
            raise DomainError("VERSION_CONFLICT", "Run revision changed", status=409)

    async def list_runs(
        self, *, status: str | None, limit: int, cursor_created_at=None, cursor_run_id=None,
        task_type: str | None = None, task_created_from: datetime | None = None,
    ) -> list[dict]:
        result = await self.connection.execute(
            """SELECT run_id,task_id,generation,execution_request_id,status,revision,
                      agent_session_id,lease_expires_at,heartbeat_at,started_at,finished_at,
                      failure_code,failure_detail,dispatch_attempts,next_dispatch_at,
                      created_at,updated_at
               FROM workbench.operational_task_runs
               WHERE project_id=%s
                 AND (%s::text IS NULL OR status=%s::text)
                 AND (%s::timestamptz IS NULL OR (created_at,run_id)>(%s::timestamptz,%s::uuid))
                 AND (status<>'queued' OR next_dispatch_at<=now())
                 AND EXISTS (
                     SELECT 1 FROM workbench.operational_tasks t
                     WHERE t.project_id=operational_task_runs.project_id
                       AND t.task_id=operational_task_runs.task_id
                       AND (%s::text IS NULL OR t.task_type=%s::text)
                       AND (%s::timestamptz IS NULL OR t.created_at>=%s::timestamptz)
                 )
               ORDER BY created_at,run_id LIMIT %s""",
            (
                self.project_id, status, status, cursor_created_at,
                cursor_created_at, cursor_run_id,
                task_type, task_type, task_created_from, task_created_from, limit,
            ),
        )
        return [dict(row) for row in await result.fetchall()]

    async def claim_expired_runs(
        self, limit: int, *, task_type: str | None = None, task_created_from: datetime | None = None,
    ) -> list[dict]:
        cursor = await self.connection.execute(
            """SELECT run_id,task_id,generation,execution_request_id,status,revision,
                      agent_session_id,lease_expires_at,heartbeat_at,started_at,finished_at,
                      failure_code,failure_detail,dispatch_attempts,next_dispatch_at,
                      created_at,updated_at
               FROM workbench.operational_task_runs
               WHERE project_id=%s AND status IN ('claimed','running')
                 AND lease_expires_at IS NOT NULL AND lease_expires_at<=now()
                 AND EXISTS (
                     SELECT 1 FROM workbench.operational_tasks t
                     WHERE t.project_id=operational_task_runs.project_id
                       AND t.task_id=operational_task_runs.task_id
                       AND (%s::text IS NULL OR t.task_type=%s::text)
                       AND (%s::timestamptz IS NULL OR t.created_at>=%s::timestamptz)
                 )
               ORDER BY lease_expires_at,run_id FOR UPDATE SKIP LOCKED LIMIT %s""",
            (self.project_id, task_type, task_type, task_created_from, task_created_from, limit),
        )
        return [dict(row) for row in await cursor.fetchall()]

    async def consecutive_timed_out_runs(self, task_id: str) -> int:
        cursor = await self.connection.execute(
            """SELECT status FROM workbench.operational_task_runs
               WHERE project_id=%s AND task_id=%s ORDER BY generation DESC""",
            (self.project_id, task_id),
        )
        count = 0
        for row in await cursor.fetchall():
            if row["status"] != "timed_out":
                break
            count += 1
        return count

    async def append_event(
        self, *, topic: str, aggregate_type: str, aggregate_id: str,
        aggregate_revision: int, occurred_at, metadata: dict | None = None,
    ) -> int:
        event_id = uuid4()
        cursor = await self.connection.execute(
            """INSERT INTO workbench.domain_event_log
               (project_id,event_id,topic,aggregate_type,aggregate_id,
                aggregate_revision,occurred_at,metadata)
               VALUES (%s,%s,%s,%s,%s,%s,%s,%s) RETURNING event_seq""",
            (
                self.project_id, event_id, topic, aggregate_type, aggregate_id,
                aggregate_revision, occurred_at, Jsonb(metadata or {}),
            ),
        )
        row = await cursor.fetchone()
        event_seq = int(row["event_seq"])
        await self.connection.execute(
            "SELECT pg_notify('workbench_events', %s)",
            (f'{self.project_id}:{event_seq}',),
        )
        return event_seq

    async def current_event_cursor(self) -> int:
        return await WorkbenchEventRepository(self.connection, self.project_id).current_cursor()

    async def get_task_by_create_request(self, request_id: str) -> dict | None:
        cursor = await self.connection.execute(
            """SELECT document FROM workbench.operational_tasks
               WHERE project_id=%s AND create_request_id=%s""",
            (self.project_id, request_id),
        )
        row = await cursor.fetchone()
        return row["document"] if row else None

    async def get_task_by_external_source(
        self, source_kind: str, external_id: str
    ) -> dict | None:
        cursor = await self.connection.execute(
            """SELECT document FROM workbench.operational_tasks
               WHERE project_id=%s
                 AND document#>>'{source,kind}'=%s
                 AND document#>>'{source,external_id}'=%s""",
            (self.project_id, source_kind, external_id),
        )
        row = await cursor.fetchone()
        return row["document"] if row else None

    async def list_tasks(
        self,
        *,
        task_type: str | None,
        status: str | None,
        limit: int,
        offset: int,
        peripheral_work_order_id: str | None = None,
    ) -> list[dict]:
        cursor = await self.connection.execute(
            """SELECT task.document,
                      CASE WHEN active_run.run_id IS NULL THEN NULL
                           ELSE to_jsonb(active_run) - 'project_id' END AS active_run,
                      CASE WHEN latest_run.run_id IS NULL THEN NULL
                           ELSE to_jsonb(latest_run) - 'project_id' END AS latest_run
               FROM workbench.operational_tasks AS task
               LEFT JOIN LATERAL (
                   SELECT run.* FROM workbench.operational_task_runs AS run
                   WHERE run.project_id=task.project_id AND run.task_id=task.task_id
                     AND run.status IN ('queued','claimed','running')
                   ORDER BY run.generation DESC LIMIT 1
               ) AS active_run ON true
               LEFT JOIN LATERAL (
                   SELECT run.* FROM workbench.operational_task_runs AS run
                   WHERE run.project_id=task.project_id AND run.task_id=task.task_id
                   ORDER BY run.generation DESC LIMIT 1
               ) AS latest_run ON true
               WHERE task.project_id=%s
                 AND (task.document#>>'{source,deleted_at}') IS NULL
                 AND (%s::text IS NULL OR task.task_type=%s::text)
                 AND (%s::text IS NULL OR task.status=%s::text)
                 AND (%s::text IS NULL
                      OR (task.document#>>'{source,kind}'='external_system'
                          AND task.document#>>'{source,external_id}' IN (%s,%s))
                      OR EXISTS (
                          SELECT 1 FROM workbench.operational_task_actions AS action
                          WHERE action.project_id=task.project_id AND action.task_id=task.task_id
                            AND action.document->>'kind'='create_work_order'
                            AND action.document#>>'{receipt,adapter}'='peripheral_sample'
                            AND action.document#>>'{receipt,receipt_id}'=%s
                      ))
               ORDER BY task.updated_at DESC,task.task_id
               LIMIT %s OFFSET %s""",
            (
                self.project_id,
                task_type,
                task_type,
                status,
                status,
                peripheral_work_order_id,
                peripheral_work_order_id,
                f"peripheral_sample:{peripheral_work_order_id}" if peripheral_work_order_id else None,
                peripheral_work_order_id,
                limit,
                offset,
            ),
        )
        return [
            {**row["document"], "active_run": row["active_run"], "latest_run": row["latest_run"]}
            for row in await cursor.fetchall()
        ]

    async def insert_task(self, task: dict, create_request_id: str) -> None:
        await self.connection.execute(
            """INSERT INTO workbench.operational_tasks
               (project_id,task_id,create_request_id,task_type,workflow,status,lifecycle_status,priority,
                revision,execution_generation,execution_request_id,agent_session_id,
                agent_lease_expires_at,current_plan_revision,current_report_revision,
                scheduled_for,created_at,updated_at,document)
               VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)""",
            self._task_params(task, create_request_id),
        )

    async def update_task(self, task: dict) -> None:
        cursor = await self.connection.execute(
            """UPDATE workbench.operational_tasks SET
                 status=%s,lifecycle_status=%s,revision=%s,execution_generation=%s,execution_request_id=%s,
                 agent_session_id=%s,agent_lease_expires_at=%s,current_plan_revision=%s,
                 current_report_revision=%s,updated_at=%s,document=%s
               WHERE project_id=%s AND task_id=%s AND revision=%s""",
            (
                task["status"], task["lifecycle_status"], task["revision"], task["execution_generation"],
                task["execution_request_id"], task.get("agent_session_id"),
                task.get("agent_lease_expires_at"), task.get("current_plan_revision"),
                task.get("current_report_revision"), task["updated_at"], Jsonb(task),
                self.project_id, task["task_id"], task["revision"] - 1,
            ),
        )
        if cursor.rowcount != 1:
            raise DomainError("VERSION_CONFLICT", "Task revision changed", status=409)

    def _task_params(self, task: dict, create_request_id: str) -> tuple:
        return (
            self.project_id, task["task_id"], create_request_id, task["task_type"],
            task["workflow"], task["status"], task["lifecycle_status"], task["priority"], task["revision"],
            task["execution_generation"], task["execution_request_id"],
            task.get("agent_session_id"), task.get("agent_lease_expires_at"),
            task.get("current_plan_revision"), task.get("current_report_revision"),
            task.get("scheduled_for"), task["created_at"], task["updated_at"], Jsonb(task),
        )

    async def get_evidence(self, task_id: str, evidence_id: str) -> dict | None:
        cursor = await self.connection.execute(
            """SELECT document FROM workbench.operational_task_evidence
               WHERE project_id=%s AND task_id=%s AND evidence_id=%s""",
            (self.project_id, task_id, evidence_id),
        )
        row = await cursor.fetchone()
        return row["document"] if row else None

    async def list_evidence(self, task_id: str) -> list[dict]:
        cursor = await self.connection.execute(
            """SELECT document FROM workbench.operational_task_evidence
               WHERE project_id=%s AND task_id=%s ORDER BY created_at,evidence_id""",
            (self.project_id, task_id),
        )
        return [row["document"] for row in await cursor.fetchall()]

    async def insert_evidence(self, task_id: str, evidence: dict) -> None:
        await self.connection.execute(
            """INSERT INTO workbench.operational_task_evidence
               (project_id,task_id,evidence_id,document,created_at)
               VALUES (%s,%s,%s,%s,%s)""",
            (self.project_id, task_id, evidence["evidence_id"], Jsonb(evidence),
             evidence["recorded_at"]),
        )

    async def access_requests_available(self) -> bool:
        # Older project databases can serve existing tasks before migration 019.
        # Keep approval writes fail-closed until the table is provisioned.
        availability = await self.connection.execute(
            "SELECT to_regclass('workbench.operational_task_access_requests') AS relation"
        )
        return (await availability.fetchone())["relation"] is not None

    async def list_access_requests(self, task_id: str) -> list[dict]:
        if not await self.access_requests_available():
            return []
        cursor = await self.connection.execute(
            """SELECT document FROM workbench.operational_task_access_requests
               WHERE project_id=%s AND task_id=%s
               ORDER BY requested_at,access_request_id""",
            (self.project_id, task_id),
        )
        return [row["document"] for row in await cursor.fetchall()]

    async def get_access_request(self, task_id: str, access_request_id: str) -> dict | None:
        cursor = await self.connection.execute(
            """SELECT document FROM workbench.operational_task_access_requests
               WHERE project_id=%s AND task_id=%s AND access_request_id=%s""",
            (self.project_id, task_id, access_request_id),
        )
        row = await cursor.fetchone()
        return row["document"] if row else None

    async def insert_access_request(self, task_id: str, document: dict) -> None:
        await self.connection.execute(
            """INSERT INTO workbench.operational_task_access_requests
               (project_id,task_id,access_request_id,node_id,status,version,document,requested_at,updated_at)
               VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s)""",
            (self.project_id, task_id, document["access_request_id"], document["node_id"],
             document["status"], document["version"], Jsonb(document),
             document["requested_at"], document["requested_at"]),
        )

    async def update_access_request(self, task_id: str, document: dict, expected_version: int) -> None:
        cursor = await self.connection.execute(
            """UPDATE workbench.operational_task_access_requests
               SET status=%s,version=%s,document=%s,updated_at=%s
               WHERE project_id=%s AND task_id=%s AND access_request_id=%s AND version=%s""",
            (document["status"], document["version"], Jsonb(document), document["decided_at"],
             self.project_id, task_id, document["access_request_id"], expected_version),
        )
        if cursor.rowcount != 1:
            raise DomainError("VERSION_CONFLICT", "Access request version changed", status=409)

    async def get_latest_plan(self, task_id: str) -> dict | None:
        return await self._latest_artifact("operational_task_plans", task_id)

    async def get_latest_report(self, task_id: str) -> dict | None:
        return await self._latest_artifact("operational_task_reports", task_id)

    async def get_report(self, task_id: str, revision: int) -> dict | None:
        cursor = await self.connection.execute(
            """SELECT document FROM workbench.operational_task_reports
               WHERE project_id=%s AND task_id=%s AND revision=%s""",
            (self.project_id, task_id, revision),
        )
        row = await cursor.fetchone()
        return row["document"] if row else None

    async def list_reports(self, task_id: str, limit: int, offset: int) -> list[dict]:
        cursor = await self.connection.execute(
            """SELECT document FROM workbench.operational_task_reports
               WHERE project_id=%s AND task_id=%s ORDER BY revision DESC
               LIMIT %s OFFSET %s""",
            (self.project_id, task_id, limit, offset),
        )
        return [row["document"] for row in await cursor.fetchall()]

    async def _latest_artifact(self, table: str, task_id: str) -> dict | None:
        if table not in {"operational_task_plans", "operational_task_reports"}:
            raise ValueError("unsupported artifact table")
        cursor = await self.connection.execute(
            f"""SELECT document FROM workbench.{table}
                WHERE project_id=%s AND task_id=%s ORDER BY revision DESC LIMIT 1""",
            (self.project_id, task_id),
        )
        row = await cursor.fetchone()
        return row["document"] if row else None

    async def insert_plan(self, task_id: str, snapshot: dict) -> None:
        await self._insert_artifact("operational_task_plans", task_id, snapshot)

    async def insert_report(self, task_id: str, snapshot: dict) -> None:
        await self._insert_artifact("operational_task_reports", task_id, snapshot)

    async def get_latest_progress(self, task_id: str, generation: int) -> dict | None:
        # Read compatibility before the coordinated progress migration is applied.
        availability = await self.connection.execute(
            "SELECT to_regclass('workbench.operational_task_progress') AS relation"
        )
        if not (await availability.fetchone())["relation"]:
            return None
        cursor = await self.connection.execute(
            """SELECT progress.document FROM workbench.operational_task_progress AS progress
               JOIN workbench.operational_task_runs AS run
                 ON run.project_id=progress.project_id AND run.run_id=progress.run_id
                    AND run.task_id=progress.task_id
               WHERE progress.project_id=%s AND progress.task_id=%s AND run.generation=%s""",
            (self.project_id, task_id, generation),
        )
        row = await cursor.fetchone()
        return row["document"] if row else None

    async def save_progress(self, task_id: str, snapshot: dict) -> None:
        cursor = await self.connection.execute(
            """INSERT INTO workbench.operational_task_progress
               (project_id,task_id,run_id,revision,document,published_at)
               VALUES (%s,%s,%s,%s,%s,%s)
               ON CONFLICT(project_id,task_id,run_id) DO UPDATE SET
                 revision=excluded.revision,document=excluded.document,published_at=excluded.published_at
               WHERE workbench.operational_task_progress.revision=excluded.revision-1""",
            (self.project_id, task_id, snapshot["run_id"], snapshot["revision"],
             Jsonb(snapshot), snapshot["published_at"]),
        )
        if cursor.rowcount != 1:
            raise DomainError("VERSION_CONFLICT", "Investigation progress revision changed", status=409)

    async def _insert_artifact(self, table: str, task_id: str, snapshot: dict) -> None:
        if table not in {"operational_task_plans", "operational_task_reports"}:
            raise ValueError("unsupported artifact table")
        await self.connection.execute(
            f"""INSERT INTO workbench.{table}
                (project_id,task_id,revision,document,created_at)
                VALUES (%s,%s,%s,%s,%s)""",
            (self.project_id, task_id, snapshot["revision"], Jsonb(snapshot),
             snapshot["published_at"]),
        )

    async def get_action(self, task_id: str, action_id: str) -> dict | None:
        cursor = await self.connection.execute(
            """SELECT document FROM workbench.operational_task_actions
               WHERE project_id=%s AND task_id=%s AND action_id=%s""",
            (self.project_id, task_id, action_id),
        )
        row = await cursor.fetchone()
        return row["document"] if row else None

    async def list_actions(self, task_id: str) -> list[dict]:
        cursor = await self.connection.execute(
            """SELECT document FROM workbench.operational_task_actions
               WHERE project_id=%s AND task_id=%s ORDER BY created_at,action_id""",
            (self.project_id, task_id),
        )
        return [row["document"] for row in await cursor.fetchall()]

    async def insert_action(self, task_id: str, action: dict) -> None:
        await self.connection.execute(
            """INSERT INTO workbench.operational_task_actions
               (project_id,task_id,action_id,version,approval_status,execution_status,
                document,created_at,updated_at)
               VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s)""",
            (self.project_id, task_id, action["action_id"], action["version"],
             action["approval_status"], action["execution_status"], Jsonb(action),
             action["proposed_at"], action["proposed_at"]),
        )
        await self._insert_action_revision(task_id, action)

    async def update_action(self, task_id: str, action: dict) -> None:
        await self._insert_action_revision(task_id, action)
        await self.connection.execute(
            """UPDATE workbench.operational_task_actions SET
                 version=%s,approval_status=%s,execution_status=%s,document=%s,updated_at=%s
               WHERE project_id=%s AND task_id=%s AND action_id=%s""",
            (action["version"], action["approval_status"], action["execution_status"],
             Jsonb(action), action.get("executed_at") or action.get("decided_at") or action.get("edited_at") or
             action["proposed_at"], self.project_id, task_id, action["action_id"]),
        )

    async def _insert_action_revision(self, task_id: str, action: dict) -> None:
        await self.connection.execute(
            """INSERT INTO workbench.operational_task_action_revisions
               (project_id,task_id,action_id,version,document,recorded_at)
               VALUES (%s,%s,%s,%s,%s,%s)""",
            (
                self.project_id, task_id, action["action_id"], action["version"],
                Jsonb(action), action.get("executed_at") or action.get("decided_at") or action.get("edited_at")
                or action["proposed_at"],
            ),
        )

    async def get_feedback(self, task_id: str, source_event_id: str) -> dict | None:
        cursor = await self.connection.execute(
            """SELECT source_revision,document,accepted_at
               FROM workbench.operational_task_external_feedback
               WHERE project_id=%s AND task_id=%s AND source_event_id=%s""",
            (self.project_id, task_id, source_event_id),
        )
        row = await cursor.fetchone()
        return dict(row) if row else None

    async def upsert_feedback(self, task_id: str, feedback: dict, accepted_at) -> None:
        await self.connection.execute(
            """INSERT INTO workbench.operational_task_external_feedback
               (project_id,task_id,source_event_id,source_revision,document,accepted_at)
               VALUES (%s,%s,%s,%s,%s,%s)
               ON CONFLICT(project_id,task_id,source_event_id) DO UPDATE SET
                 source_revision=excluded.source_revision,document=excluded.document,
                 accepted_at=excluded.accepted_at""",
            (self.project_id, task_id, feedback["source_event_id"],
             feedback["source_revision"], Jsonb(feedback), accepted_at),
        )

    async def insert_notification(self, notification: dict) -> None:
        await self.connection.execute(
            """INSERT INTO workbench.operational_task_notifications
               (project_id,notification_id,task_id,created_at,document)
               VALUES (%s,%s,%s,%s,%s)""",
            (self.project_id, notification["notification_id"], notification["task_id"],
             notification["created_at"], Jsonb(notification)),
        )

    async def resolve_notifications(
        self,
        task_id: str,
        *,
        kinds: list[str],
        subject_type: str,
        subject_id: str,
        resolved_at,
        resolution_reason: str,
    ) -> list[dict]:
        cursor = await self.connection.execute(
            """UPDATE workbench.operational_task_notifications
               SET document=document || jsonb_build_object(
                   'lifecycle_status','resolved',
                   'resolved_at',to_jsonb(%s::timestamptz),
                   'resolution_reason',%s::text
               )
               WHERE project_id=%s AND task_id=%s
                 AND COALESCE(document->>'lifecycle_status','active')='active'
                 AND document->>'kind'=ANY(%s)
                 AND document->>'subject_type'=%s
                 AND document->>'subject_id'=%s
               RETURNING document""",
            (
                resolved_at,
                resolution_reason,
                self.project_id,
                task_id,
                kinds,
                subject_type,
                subject_id,
            ),
        )
        return [row["document"] for row in await cursor.fetchall()]

    async def get_notification(self, notification_id: str, user_id: str) -> dict | None:
        cursor = await self.connection.execute(
            """SELECT n.document || jsonb_build_object(
                     'status',CASE WHEN r.read_at IS NULL THEN 'unread' ELSE 'read' END,
                     'version',COALESCE(r.version,1),
                     'read_at',r.read_at,'read_by',
                         CASE WHEN r.user_id IS NULL THEN NULL ELSE 'principal:' || r.user_id::text END
                   ) AS document
               FROM workbench.operational_task_notifications n
               LEFT JOIN workbench.operational_task_notification_reads r
                 ON r.project_id=n.project_id AND r.notification_id=n.notification_id
                AND r.user_id=%s
               WHERE n.project_id=%s AND n.notification_id=%s""",
            (user_id, self.project_id, notification_id),
        )
        row = await cursor.fetchone()
        return row["document"] if row else None

    async def mark_notification_read(
        self, notification_id: str, user_id: str, version: int, read_at
    ) -> None:
        await self.connection.execute(
            """INSERT INTO workbench.operational_task_notification_reads
               (project_id,notification_id,user_id,version,read_at)
               VALUES (%s,%s,%s,%s,%s)
               ON CONFLICT(project_id,notification_id,user_id) DO UPDATE SET
                 version=excluded.version,read_at=excluded.read_at""",
            (self.project_id, notification_id, user_id, version, read_at),
        )

    async def list_notifications(
        self, *, user_id: str, allowed_permissions: list[str],
        unread_only: bool, limit: int, offset: int
    ) -> list[dict]:
        cursor = await self.connection.execute(
            """SELECT n.document || jsonb_build_object(
                     'status',CASE WHEN r.read_at IS NULL THEN 'unread' ELSE 'read' END,
                     'version',COALESCE(r.version,1),
                     'read_at',r.read_at,'read_by',
                         CASE WHEN r.user_id IS NULL THEN NULL ELSE 'principal:' || r.user_id::text END
                   ) AS document
               FROM workbench.operational_task_notifications n
               LEFT JOIN workbench.operational_task_notification_reads r
                 ON r.project_id=n.project_id AND r.notification_id=n.notification_id
                AND r.user_id=%s
               WHERE n.project_id=%s
                 AND COALESCE(n.document->>'lifecycle_status','active')='active'
                 AND (%s=false OR r.read_at IS NULL)
                 AND (n.document->>'required_permission' IS NULL
                      OR n.document->>'required_permission'=ANY(%s))
               ORDER BY n.created_at DESC,n.notification_id LIMIT %s OFFSET %s""",
            (user_id, self.project_id, unread_only, allowed_permissions, limit, offset),
        )
        return [row["document"] for row in await cursor.fetchall()]

    async def get_schedule_by_request(self, request_id: str) -> dict | None:
        cursor = await self.connection.execute(
            """SELECT document FROM workbench.operational_task_schedules
               WHERE project_id=%s AND create_request_id=%s""",
            (self.project_id, request_id),
        )
        row = await cursor.fetchone()
        return row["document"] if row else None

    async def insert_schedule(self, schedule: dict, request_id: str) -> None:
        await self.connection.execute(
            """INSERT INTO workbench.operational_task_schedules
               (project_id,schedule_id,create_request_id,schedule_key,next_run_at,
                interval_seconds,enabled,version,document,created_at,updated_at)
               VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)""",
            (self.project_id, schedule["schedule_id"], request_id,
             schedule["schedule_key"], schedule["next_run_at"],
             schedule["interval_seconds"], schedule["enabled"], schedule["version"],
             Jsonb(schedule), schedule["created_at"], schedule["updated_at"]),
        )

    async def list_schedules(self) -> list[dict]:
        cursor = await self.connection.execute(
            """SELECT document FROM workbench.operational_task_schedules
               WHERE project_id=%s ORDER BY next_run_at,schedule_id""",
            (self.project_id,),
        )
        return [row["document"] for row in await cursor.fetchall()]

    async def get_schedule(self, schedule_id: str) -> dict | None:
        cursor = await self.connection.execute(
            """SELECT document FROM workbench.operational_task_schedules
               WHERE project_id=%s AND schedule_id=%s""",
            (self.project_id, schedule_id),
        )
        row = await cursor.fetchone()
        return row["document"] if row else None

    async def update_schedule(self, schedule: dict) -> None:
        cursor = await self.connection.execute(
            """UPDATE workbench.operational_task_schedules SET
                 enabled=%s,version=%s,updated_at=%s,document=%s
               WHERE project_id=%s AND schedule_id=%s AND version=%s""",
            (
                schedule["enabled"], schedule["version"], schedule["updated_at"],
                Jsonb(schedule), self.project_id, schedule["schedule_id"],
                schedule["version"] - 1,
            ),
        )
        if cursor.rowcount != 1:
            raise DomainError("VERSION_CONFLICT", "Schedule version changed", status=409)

    async def claim_due_schedules(self, limit: int) -> list[dict]:
        cursor = await self.connection.execute(
            """SELECT document FROM workbench.operational_task_schedules
               WHERE project_id=%s AND enabled=true AND next_run_at <= now()
               ORDER BY next_run_at,schedule_id FOR UPDATE SKIP LOCKED LIMIT %s""",
            (self.project_id, limit),
        )
        return [row["document"] for row in await cursor.fetchall()]

    async def advance_schedule(self, schedule: dict) -> None:
        await self.connection.execute(
            """UPDATE workbench.operational_task_schedules SET
                 next_run_at=%s,version=%s,updated_at=%s,document=%s
               WHERE project_id=%s AND schedule_id=%s""",
            (schedule["next_run_at"], schedule["version"], schedule["updated_at"],
             Jsonb(schedule), self.project_id, schedule["schedule_id"]),
        )

    async def insert_occurrence(self, schedule_id: str, due_at, task_id: str, created_at) -> bool:
        cursor = await self.connection.execute(
            """INSERT INTO workbench.operational_schedule_occurrences
               (project_id,schedule_id,due_at,task_id,created_at)
               VALUES (%s,%s,%s,%s,%s)
               ON CONFLICT(project_id,schedule_id,due_at) DO NOTHING
               RETURNING task_id""",
            (self.project_id, schedule_id, due_at, task_id, created_at),
        )
        return await cursor.fetchone() is not None