from __future__ import annotations

from datetime import datetime, timezone
from types import SimpleNamespace
from uuid import uuid4

import pytest

from models.agent_chat_message import AgentChatMessageRole
from v1.agent.repository import AgentRepository


class _ExecuteResult:
    def __init__(self, value: object) -> None:
        self._value = value

    def scalar_one_or_none(self) -> object:
        return self._value


class _FakeSession:
    def __init__(self, session_row: object) -> None:
        self.session_row = session_row
        self.added: list[object] = []
        self.flushed = False

    async def execute(self, stmt):  # noqa: ANN001
        del stmt
        return _ExecuteResult(self.session_row)

    def add(self, obj: object) -> None:
        self.added.append(obj)

    async def flush(self) -> None:
        self.flushed = True


class _FakeToolResultStorage:
    def __init__(self, payload: dict[str, object] | None) -> None:
        self._payload = payload

    async def read_json(self, *, bucket: str, path: str) -> dict[str, object] | None:
        del bucket, path
        return self._payload


@pytest.mark.asyncio
async def test_tool_message_hydrates_content_from_object_storage() -> None:
    repository = AgentRepository(
        session=SimpleNamespace(),  # type: ignore[arg-type]
        tool_result_storage=_FakeToolResultStorage(
            {
                "toolName": "front.navigate_to_route",
                "result": {"ok": True, "applied": True, "content": "已跳转"},
            }
        ),
    )
    message = SimpleNamespace(
        id=uuid4(),
        role=AgentChatMessageRole.TOOL,
        created_at=datetime.now(timezone.utc),
        content='{"offloaded":true}',
        metadata_json={
            "tool_call_id": "call-1",
            "storage_bucket": "private",
            "storage_path": "tool-results/run-1/call-1.json",
        },
    )

    payload = await repository._to_snapshot_message(message)  # type: ignore[arg-type]

    assert payload["toolCallId"] == "call-1"
    assert payload["content"] == "已跳转"


@pytest.mark.asyncio
async def test_tool_message_keeps_inline_content_when_storage_payload_missing() -> None:
    repository = AgentRepository(
        session=SimpleNamespace(),  # type: ignore[arg-type]
        tool_result_storage=_FakeToolResultStorage(None),
    )
    message = SimpleNamespace(
        id=uuid4(),
        role=AgentChatMessageRole.TOOL,
        created_at=datetime.now(timezone.utc),
        content="inline-tool-content",
        metadata_json={
            "tool_call_id": "call-2",
            "storage_bucket": "private",
            "storage_path": "tool-results/run-1/call-2.json",
        },
    )

    payload = await repository._to_snapshot_message(message)  # type: ignore[arg-type]

    assert payload["toolCallId"] == "call-2"
    assert payload["content"] == "inline-tool-content"


@pytest.mark.asyncio
async def test_user_message_snapshot_includes_renderable_attachments() -> None:
    repository = AgentRepository(
        session=SimpleNamespace(),  # type: ignore[arg-type]
    )
    message = SimpleNamespace(
        id=uuid4(),
        role=AgentChatMessageRole.USER,
        created_at=datetime.now(timezone.utc),
        content="请分析这张图",
        metadata_json={
            "attachments": [
                {
                    "bucket": "agent-chat-attachments",
                    "path": "agent-inputs/u1/t1/r1/m1/att-1.png",
                    "mimeType": "image/png",
                }
            ]
        },
    )

    payload = await repository._to_snapshot_message(message)  # type: ignore[arg-type]

    assert payload["role"] == "user"
    assert payload["content"] == "请分析这张图"
    assert payload["attachments"] == [
        {
            "bucket": "agent-chat-attachments",
            "path": "agent-inputs/u1/t1/r1/m1/att-1.png",
            "mimeType": "image/png",
        }
    ]


@pytest.mark.asyncio
async def test_persist_user_message_sets_session_title_when_empty() -> None:
    session_id = str(uuid4())
    session_row = SimpleNamespace(
        message_count=0,
        title=None,
        last_activity_at=datetime.now(timezone.utc),
    )
    fake_session = _FakeSession(session_row)
    repository = AgentRepository(session=fake_session)  # type: ignore[arg-type]

    await repository.persist_user_message(
        session_id=session_id,
        run_id="run-1",
        content_text="  请帮我安排明天下午开会  ",
        metadata=None,
    )

    assert session_row.title == "请帮我安排明天下午开会"
    assert session_row.message_count == 1
    assert fake_session.flushed is True


@pytest.mark.asyncio
async def test_persist_user_message_keeps_existing_session_title() -> None:
    session_id = str(uuid4())
    session_row = SimpleNamespace(
        message_count=1,
        title="已有标题",
        last_activity_at=datetime.now(timezone.utc),
    )
    fake_session = _FakeSession(session_row)
    repository = AgentRepository(session=fake_session)  # type: ignore[arg-type]

    await repository.persist_user_message(
        session_id=session_id,
        run_id="run-2",
        content_text="新的消息内容",
        metadata=None,
    )

    assert session_row.title == "已有标题"
    assert session_row.message_count == 2