from __future__ import annotations

import json
import time
import uuid
from typing import TypedDict

import httpx
import pytest
from sqlalchemy import select

from core.db.session import AsyncSessionLocal
from models.agent_chat_session import AgentChatSession
from models.agent_chat_message import AgentChatMessage
from models.anonymous_session_snapshot import AnonymousSessionSnapshot


class IdentityData(TypedDict):
    email: str
    code: str


async def _create_email_session(
    client: httpx.AsyncClient,
    *,
    email: str,
    code: str,
) -> dict[str, object]:
    resp = await client.post(
        "/api/v1/auth/email-session",
        json={"email": email, "token": code},
    )
    resp.raise_for_status()
    return resp.json()


async def _wait_terminal_event(
    client: httpx.AsyncClient,
    *,
    access_token: str,
    thread_id: str,
    run_id: str,
    timeout_s: int = 180,
) -> str:
    headers = {"Authorization": f"Bearer {access_token}"}
    params = {"runId": run_id, "idle_limit": 120}
    started = time.time()

    async with client.stream(
        "GET",
        f"/api/v1/agent/runs/{thread_id}/events",
        headers=headers,
        params=params,
    ) as resp:
        resp.raise_for_status()
        async for line in resp.aiter_lines():
            if time.time() - started > timeout_s:
                raise TimeoutError("SSE timed out")
            if not line or not line.startswith("data: "):
                continue
            event = json.loads(line[6:])
            event_type = event.get("type")
            if event_type in {"RUN_FINISHED", "RUN_ERROR"}:
                return str(event_type)

    raise RuntimeError("No terminal SSE event")


def _build_run_payload(*, thread_id: str, run_id: str) -> dict[str, object]:
    now = int(time.time() * 1000)
    return {
        "threadId": thread_id,
        "runId": run_id,
        "state": {},
        "messages": [
            {
                "id": f"msg_{run_id}_user_0",
                "role": "user",
                "content": "今天事业运如何？",
            }
        ],
        "tools": [],
        "context": [],
        "forwardedProps": {
            "runtime_mode": "chat",
            "client_time": {
                "device_timezone": "Asia/Shanghai",
                "client_now_iso": "2026-04-15T12:00:00Z",
                "client_epoch_ms": now,
            },
            "divinationPayload": {
                "divinationMethod": "自动起卦",
                "questionType": "事业",
                "question": "今天事业运如何？",
                "divinationTimeIso": "2026-04-15T12:00:00Z",
                "yaoLines": ["少阳", "少阴", "老阳", "少阳", "老阴", "少阴"],
            },
        },
    }


@pytest.mark.asyncio
async def test_session_delete_anonymizes_and_hard_deletes(
    api_client: httpx.AsyncClient,
    test_identity: IdentityData,
    db_cleanup: list[str],
) -> None:
    email = str(test_identity["email"]).strip().lower()
    db_cleanup.append(email)

    auth_resp = await _create_email_session(
        api_client,
        email=email,
        code=str(test_identity["code"]),
    )
    user = auth_resp.get("user")
    assert isinstance(user, dict)
    access_token = str(auth_resp["access_token"])
    headers = {"Authorization": f"Bearer {access_token}"}

    thread_id = str(uuid.uuid4())
    run_id = f"run_{int(time.time() * 1000)}"

    enqueue = await api_client.post(
        "/api/v1/agent/runs",
        headers=headers,
        json=_build_run_payload(thread_id=thread_id, run_id=run_id),
    )
    assert enqueue.status_code == 202

    terminal = await _wait_terminal_event(
        api_client,
        access_token=access_token,
        thread_id=thread_id,
        run_id=run_id,
    )
    assert terminal in {"RUN_FINISHED", "RUN_ERROR"}

    async with AsyncSessionLocal() as session:
        session_result = await session.execute(
            select(AgentChatSession).where(AgentChatSession.id == uuid.UUID(thread_id))
        )
        session_obj = session_result.scalar_one_or_none()
        assert session_obj is not None, "Session should exist before deletion"

    delete_resp = await api_client.delete(
        f"/api/v1/agent/sessions/{thread_id}",
        headers=headers,
    )
    assert delete_resp.status_code == 204

    async with AsyncSessionLocal() as session:
        session_result = await session.execute(
            select(AgentChatSession).where(AgentChatSession.id == uuid.UUID(thread_id))
        )
        deleted_session = session_result.scalar_one_or_none()
        assert deleted_session is None, (
            "Session should be hard-deleted, not soft-deleted"
        )

        msg_result = await session.execute(
            select(AgentChatMessage).where(
                AgentChatMessage.session_id == uuid.UUID(thread_id)
            )
        )
        remaining_messages = msg_result.scalars().all()
        assert len(remaining_messages) == 0, (
            "Messages should be hard-deleted along with session"
        )

        snapshot_result = await session.execute(
            select(AnonymousSessionSnapshot).order_by(
                AnonymousSessionSnapshot.anonymized_at.desc()
            )
        )
        snapshots = snapshot_result.scalars().all()
        assert len(snapshots) >= 1, "At least one anonymous snapshot should exist"

        snapshot = snapshots[0]
        assert snapshot.session_type == "chat"
        assert snapshot.anonymous_id is not None
        assert snapshot.id is not None
        assert snapshot.anonymized_at is not None