from __future__ import annotations

from datetime import date
from types import SimpleNamespace
from uuid import UUID

from ag_ui.core import RunAgentInput
from fastapi import HTTPException
import pytest
from sqlalchemy.exc import IntegrityError
from core.auth.models import CurrentUser
from core.config.settings import config
import v1.agent.service as agent_service_module
from v1.agent.service import AgentService, AsrService


class _FakeRepository:
    def __init__(self) -> None:
        self.committed = False
        self.rolled_back = False
        self.deleted_session_id: str | None = None
        self.created_with_session_id: str | None = None
        self.persisted_user_messages: list[dict[str, object]] = []

    async def get_session_owner(self, *, session_id: str) -> str:
        if session_id == "00000000-0000-0000-0000-000000000001":
            return "00000000-0000-0000-0000-000000000001"
        raise HTTPException(status_code=404, detail="Session not found")

    async def create_session_for_user(
        self, *, user_id: str, session_id: str | None = None
    ) -> str:
        del user_id
        self.created_with_session_id = session_id
        return session_id or "00000000-0000-0000-0000-000000000999"

    async def commit(self) -> None:
        self.committed = True

    async def rollback(self) -> None:
        self.rolled_back = True

    async def delete_session(self, *, session_id: str) -> None:
        self.deleted_session_id = session_id

    async def get_history_day(
        self, *, session_id: str, before: date | None
    ) -> dict[str, object] | None:
        del session_id
        if before is not None and before <= date(2026, 3, 6):
            return None
        return {
            "day": "2026-03-06",
            "hasMore": False,
            "messages": [{"id": "m1", "role": "assistant", "content": "hello"}],
        }

    async def get_latest_session_id_for_user(self, *, user_id: str) -> str | None:
        del user_id
        return "00000000-0000-0000-0000-000000000001"

    async def persist_user_message(
        self,
        *,
        session_id: str,
        run_id: str,
        content_text: str,
        metadata: dict[str, object] | None,
    ) -> None:
        self.persisted_user_messages.append(
            {
                "session_id": session_id,
                "run_id": run_id,
                "content_text": content_text,
                "metadata": metadata,
            }
        )

    async def get_message_attachment_reference(
        self,
        *,
        session_id: str,
        message_id: str,
        attachment_index: int,
    ) -> dict[str, str] | None:
        del session_id, message_id
        if attachment_index != 0:
            return None
        return {
            "bucket": config.storage.bucket,
            "path": "agent-inputs/00000000-0000-0000-0000-000000000001/00000000-0000-0000-0000-000000000001/run-1/attachment-0-a.png",
            "mimeType": "image/png",
        }


class _FakeQueue:
    def __init__(self) -> None:
        self.commands: list[dict[str, object]] = []

    async def enqueue(
        self, *, command: dict[str, object], dedup_key: str | None
    ) -> str:
        self.commands.append(command)
        del dedup_key
        return "task-1"


class _FailingQueue:
    async def enqueue(
        self, *, command: dict[str, object], dedup_key: str | None
    ) -> str:
        del command, dedup_key
        raise RuntimeError("enqueue failed")


class _FakeStream:
    async def read(
        self, *, session_id: str, last_event_id: str | None
    ) -> list[dict[str, object]]:
        del session_id
        return [
            {"id": "2-0", "event": {"type": "RUN_STARTED"}, "cursor": last_event_id}
        ]


class _FakeAttachmentStorage:
    def __init__(self) -> None:
        self.calls: list[dict[str, object]] = []

    async def upload_bytes(
        self,
        *,
        bucket: str,
        path: str,
        content: bytes,
        content_type: str,
    ) -> str:
        self.calls.append(
            {
                "bucket": bucket,
                "path": path,
                "content": content,
                "content_type": content_type,
            }
        )
        return path

    async def download_bytes(self, *, bucket: str, path: str) -> bytes:
        self.calls.append(
            {
                "bucket": bucket,
                "path": path,
                "download": True,
            }
        )
        return b"png-bytes"

    async def create_signed_url(
        self,
        *,
        bucket: str,
        path: str,
        expires_in_seconds: int,
    ) -> str:
        self.calls.append(
            {
                "bucket": bucket,
                "path": path,
                "signed": True,
                "expires_in_seconds": expires_in_seconds,
            }
        )
        return f"https://signed.example/{path}?exp={expires_in_seconds}"


class _AlwaysFailAttachmentStorage:
    async def upload_bytes(
        self,
        *,
        bucket: str,
        path: str,
        content: bytes,
        content_type: str,
    ) -> str:
        del bucket, path, content, content_type
        raise RuntimeError("upload failed")

    async def download_bytes(self, *, bucket: str, path: str) -> bytes:
        del bucket, path
        raise RuntimeError("download failed")

    async def create_signed_url(
        self,
        *,
        bucket: str,
        path: str,
        expires_in_seconds: int,
    ) -> str:
        del bucket, path, expires_in_seconds
        raise RuntimeError("sign failed")


def _user() -> CurrentUser:
    return CurrentUser(
        id=UUID("00000000-0000-0000-0000-000000000001"),
        email="user@example.com",
    )


def _build_run_input(*, thread_id: str, run_id: str) -> RunAgentInput:
    return RunAgentInput.model_validate(
        {
            "threadId": thread_id,
            "runId": run_id,
            "state": {},
            "messages": [{"id": "u1", "role": "user", "content": "hello"}],
            "tools": [],
            "context": [],
            "forwardedProps": {},
        }
    )


async def test_resume_idempotency_uses_redis_lock_and_task_key() -> None:
    service = AgentService(
        repository=_FakeRepository(),
        queue=_FakeQueue(),
        stream=_FakeStream(),
    )
    user = _user()
    run_input = _build_run_input(
        thread_id="00000000-0000-0000-0000-000000000001",
        run_id="run-1",
    )

    first = await service.enqueue_resume(
        thread_id="00000000-0000-0000-0000-000000000001",
        run_input=run_input,
        current_user=user,
    )
    second = await service.enqueue_resume(
        thread_id="00000000-0000-0000-0000-000000000001",
        run_input=run_input,
        current_user=user,
    )

    assert first.task_id == second.task_id


async def test_enqueue_run_creates_missing_thread_session() -> None:
    repository = _FakeRepository()
    queue = _FakeQueue()
    service = AgentService(
        repository=repository,
        queue=queue,
        stream=_FakeStream(),
    )
    run_input = _build_run_input(
        thread_id="00000000-0000-0000-0000-000000000999",
        run_id="run-1",
    )

    accepted = await service.enqueue_run(
        run_input=run_input,
        current_user=_user(),
    )

    assert accepted.thread_id == "00000000-0000-0000-0000-000000000999"
    assert accepted.run_id == "run-1"
    assert accepted.created is True
    assert repository.created_with_session_id == "00000000-0000-0000-0000-000000000999"
    assert repository.committed is True
    assert queue.commands[0]["user_token"] is None


async def test_enqueue_run_uses_explicit_user_token() -> None:
    repository = _FakeRepository()
    queue = _FakeQueue()
    service = AgentService(
        repository=repository,
        queue=queue,
        stream=_FakeStream(),
    )
    run_input = _build_run_input(
        thread_id="00000000-0000-0000-0000-000000000001",
        run_id="run-1",
    )

    await service.enqueue_run(
        run_input=run_input,
        current_user=_user(),
        user_token="Bearer access-token-1",
    )

    assert queue.commands
    assert queue.commands[0]["user_token"] == "access-token-1"


async def test_enqueue_run_keeps_created_session_when_enqueue_fails() -> None:
    repository = _FakeRepository()
    service = AgentService(
        repository=repository,
        queue=_FailingQueue(),
        stream=_FakeStream(),
    )
    run_input = _build_run_input(
        thread_id="00000000-0000-0000-0000-000000000999",
        run_id="run-1",
    )

    try:
        await service.enqueue_run(
            run_input=run_input,
            current_user=_user(),
        )
        raise AssertionError("expected RuntimeError")
    except RuntimeError as exc:
        assert str(exc) == "enqueue failed"

    assert repository.deleted_session_id is None


async def test_enqueue_run_handles_session_create_race() -> None:
    class _RaceRepository(_FakeRepository):
        def __init__(self) -> None:
            super().__init__()
            self.create_calls = 0

        async def get_session_owner(self, *, session_id: str) -> str:
            if self.create_calls == 0:
                raise HTTPException(status_code=404, detail="Session not found")
            return "00000000-0000-0000-0000-000000000001"

        async def create_session_for_user(
            self, *, user_id: str, session_id: str | None = None
        ) -> str:
            del user_id, session_id
            self.create_calls += 1
            raise IntegrityError("insert", {}, Exception("duplicate key"))

    repository = _RaceRepository()
    service = AgentService(
        repository=repository,
        queue=_FakeQueue(),
        stream=_FakeStream(),
    )
    run_input = _build_run_input(
        thread_id="00000000-0000-0000-0000-000000000999",
        run_id="run-1",
    )

    accepted = await service.enqueue_run(
        run_input=run_input,
        current_user=_user(),
    )

    assert accepted.created is False
    assert repository.rolled_back is True


async def test_enqueue_run_uses_forwarded_attachments_and_injects_metadata(
    monkeypatch,
) -> None:
    monkeypatch.setattr(
        agent_service_module.config.storage, "bucket", "agent-test-bucket"
    )
    repository = _FakeRepository()
    attachment_storage = _FakeAttachmentStorage()
    service = AgentService(
        repository=repository,
        queue=_FakeQueue(),
        stream=_FakeStream(),
        attachment_storage=attachment_storage,
    )
    run_input = RunAgentInput.model_validate(
        {
            "threadId": "00000000-0000-0000-0000-000000000001",
            "runId": "run-with-image",
            "state": {},
            "messages": [
                {
                    "id": "u1",
                    "role": "user",
                    "content": [
                        {"type": "text", "text": "帮我看下这张图"},
                        {
                            "type": "binary",
                            "mimeType": "image/png",
                            "url": "https://signed.example/upload.png",
                        },
                    ],
                }
            ],
            "tools": [],
            "context": [],
            "forwardedProps": {
                "attachments": [
                    {
                        "bucket": "agent-test-bucket",
                        "path": "agent-inputs/00000000-0000-0000-0000-000000000001/00000000-0000-0000-0000-000000000001/upload.png",
                        "mimeType": "image/png",
                    }
                ]
            },
        }
    )

    accepted = await service.enqueue_run(run_input=run_input, current_user=_user())

    assert accepted.task_id == "task-1"
    assert len(attachment_storage.calls) == 1
    download = attachment_storage.calls[0]
    assert download["bucket"] == "agent-test-bucket"
    assert download["download"] is True
    assert repository.persisted_user_messages
    persisted = repository.persisted_user_messages[0]
    assert persisted["session_id"] == "00000000-0000-0000-0000-000000000001"
    assert persisted["run_id"] == "run-with-image"
    metadata = persisted["metadata"]
    assert isinstance(metadata, dict)
    attachments = metadata.get("attachments")
    assert isinstance(attachments, list)
    assert attachments and isinstance(attachments[0], dict)
    assert attachments[0]["bucket"] == "agent-test-bucket"
    assert isinstance(attachments[0]["path"], str)


async def test_enqueue_run_raises_when_attachment_download_fails_without_fallback(
    monkeypatch,
) -> None:
    monkeypatch.setattr(
        agent_service_module.config.storage, "bucket", "agent-test-bucket"
    )
    repository = _FakeRepository()
    service = AgentService(
        repository=repository,
        queue=_FakeQueue(),
        stream=_FakeStream(),
        attachment_storage=_AlwaysFailAttachmentStorage(),
    )
    run_input = RunAgentInput.model_validate(
        {
            "threadId": "00000000-0000-0000-0000-000000000001",
            "runId": "run-with-image-fail",
            "state": {},
            "messages": [
                {
                    "id": "u1",
                    "role": "user",
                    "content": [
                        {"type": "text", "text": "帮我看下这张图"},
                        {
                            "type": "binary",
                            "mimeType": "image/png",
                            "url": "https://signed.example/upload.png",
                        },
                    ],
                }
            ],
            "tools": [],
            "context": [],
            "forwardedProps": {
                "attachments": [
                    {
                        "bucket": "agent-test-bucket",
                        "path": "agent-inputs/00000000-0000-0000-0000-000000000001/00000000-0000-0000-0000-000000000001/upload.png",
                        "mimeType": "image/png",
                    }
                ]
            },
        }
    )

    try:
        await service.enqueue_run(run_input=run_input, current_user=_user())
        raise AssertionError("expected HTTPException")
    except HTTPException as exc:
        assert exc.status_code == 502
        assert exc.detail == "Failed to fetch attachment"

    assert repository.persisted_user_messages == []


async def test_enqueue_run_rejects_unsupported_attachment_type(
    monkeypatch,
) -> None:
    monkeypatch.setattr(
        agent_service_module.config.storage, "bucket", "agent-test-bucket"
    )
    repository = _FakeRepository()
    attachment_storage = _FakeAttachmentStorage()
    service = AgentService(
        repository=repository,
        queue=_FakeQueue(),
        stream=_FakeStream(),
        attachment_storage=attachment_storage,
    )
    run_input = RunAgentInput.model_validate(
        {
            "threadId": "00000000-0000-0000-0000-000000000001",
            "runId": "run-with-bad-image",
            "state": {},
            "messages": [
                {
                    "id": "u1",
                    "role": "user",
                    "content": [
                        {"type": "text", "text": "请看附件"},
                        {
                            "type": "binary",
                            "mimeType": "image/gif",
                            "url": "https://signed.example/upload.gif",
                        },
                    ],
                }
            ],
            "tools": [],
            "context": [],
            "forwardedProps": {
                "attachments": [
                    {
                        "bucket": "agent-test-bucket",
                        "path": "agent-inputs/00000000-0000-0000-0000-000000000001/00000000-0000-0000-0000-000000000001/upload.gif",
                        "mimeType": "image/gif",
                    }
                ]
            },
        }
    )

    with pytest.raises(HTTPException) as exc_info:
        await service.enqueue_run(run_input=run_input, current_user=_user())

    assert exc_info.value.status_code == 422
    assert exc_info.value.detail == "Unsupported attachment type"
    assert attachment_storage.calls == []


async def test_enqueue_run_rejects_attachment_too_large(
    monkeypatch,
) -> None:
    monkeypatch.setattr(agent_service_module, "_MAX_ATTACHMENT_BYTES", 4)
    monkeypatch.setattr(
        agent_service_module.config.storage, "bucket", "agent-test-bucket"
    )
    repository = _FakeRepository()
    attachment_storage = _FakeAttachmentStorage()
    service = AgentService(
        repository=repository,
        queue=_FakeQueue(),
        stream=_FakeStream(),
        attachment_storage=attachment_storage,
    )
    run_input = RunAgentInput.model_validate(
        {
            "threadId": "00000000-0000-0000-0000-000000000001",
            "runId": "run-with-big-image",
            "state": {},
            "messages": [
                {
                    "id": "u1",
                    "role": "user",
                    "content": [
                        {"type": "text", "text": "请看附件"},
                        {
                            "type": "binary",
                            "mimeType": "image/png",
                            "url": "https://signed.example/upload.png",
                        },
                    ],
                }
            ],
            "tools": [],
            "context": [],
            "forwardedProps": {
                "attachments": [
                    {
                        "bucket": "agent-test-bucket",
                        "path": "agent-inputs/00000000-0000-0000-0000-000000000001/00000000-0000-0000-0000-000000000001/upload.png",
                        "mimeType": "image/png",
                    }
                ]
            },
        }
    )

    with pytest.raises(HTTPException) as exc_info:
        await service.enqueue_run(run_input=run_input, current_user=_user())

    assert exc_info.value.status_code == 413
    assert exc_info.value.detail == "Attachment too large"
    assert len(attachment_storage.calls) == 1
    assert attachment_storage.calls[0]["download"] is True


async def test_enqueue_run_accepts_binary_url_and_persists_metadata() -> None:
    repository = _FakeRepository()
    queue = _FakeQueue()
    attachment_storage = _FakeAttachmentStorage()
    service = AgentService(
        repository=repository,
        queue=queue,
        stream=_FakeStream(),
        attachment_storage=attachment_storage,
    )
    run_input = RunAgentInput.model_validate(
        {
            "threadId": "00000000-0000-0000-0000-000000000001",
            "runId": "run-with-binary-url",
            "state": {},
            "messages": [
                {
                    "id": "u1",
                    "role": "user",
                    "content": [
                        {"type": "text", "text": "请分析"},
                        {
                            "type": "binary",
                            "mimeType": "image/png",
                            "url": "https://signed.example/upload-1.png",
                        },
                    ],
                }
            ],
            "tools": [],
            "context": [],
            "forwardedProps": {
                "attachments": [
                    {
                        "bucket": config.storage.bucket,
                        "path": "agent-inputs/00000000-0000-0000-0000-000000000001/00000000-0000-0000-0000-000000000001/upload-1.png",
                        "mimeType": "image/png",
                    }
                ]
            },
        }
    )

    accepted = await service.enqueue_run(run_input=run_input, current_user=_user())

    assert accepted.task_id == "task-1"
    persisted = repository.persisted_user_messages[-1]
    metadata = persisted["metadata"]
    assert isinstance(metadata, dict)
    attachments = metadata.get("attachments")
    assert isinstance(attachments, list)
    assert attachments[0]["path"].endswith("upload-1.png")
    queue_input = queue.commands[-1]["run_input"]
    assert isinstance(queue_input, dict)
    content = queue_input["messages"][0]["content"]
    assert isinstance(content, list)
    assert content[1]["type"] == "binary"
    assert content[1]["url"] == "https://signed.example/upload-1.png"


async def test_get_history_snapshot_wraps_history_day_as_state_snapshot_event() -> None:
    service = AgentService(
        repository=_FakeRepository(),
        queue=_FakeQueue(),
        stream=_FakeStream(),
    )

    event = await service.get_history_snapshot(
        thread_id="00000000-0000-0000-0000-000000000001",
        before=date(2026, 3, 7),
        current_user=_user(),
    )

    assert event["type"] == "STATE_SNAPSHOT"
    assert event["threadId"] == "00000000-0000-0000-0000-000000000001"
    snapshot = event["snapshot"]
    assert isinstance(snapshot, dict)
    assert snapshot["scope"] == "history_day"
    assert snapshot["day"] == "2026-03-06"
    assert snapshot["messages"][0]["id"] == "m1"


async def test_get_user_history_snapshot_uses_latest_thread_when_absent() -> None:
    service = AgentService(
        repository=_FakeRepository(),
        queue=_FakeQueue(),
        stream=_FakeStream(),
    )
    event = await service.get_user_history_snapshot(
        current_user=_user(),
        thread_id=None,
        before=None,
    )
    assert event["type"] == "STATE_SNAPSHOT"
    assert event["threadId"] == "00000000-0000-0000-0000-000000000001"


async def test_get_attachment_preview_returns_payload_and_mime() -> None:
    service = AgentService(
        repository=_FakeRepository(),
        queue=_FakeQueue(),
        stream=_FakeStream(),
        attachment_storage=_FakeAttachmentStorage(),
    )

    payload, mime_type = await service.get_attachment_preview(
        thread_id="00000000-0000-0000-0000-000000000001",
        message_id="00000000-0000-0000-0000-000000000010",
        attachment_index=0,
        current_user=_user(),
    )

    assert payload == b"png-bytes"
    assert mime_type == "image/png"


async def test_get_attachment_preview_rejects_invalid_path() -> None:
    class _BadPathRepository(_FakeRepository):
        async def get_message_attachment_reference(
            self,
            *,
            session_id: str,
            message_id: str,
            attachment_index: int,
        ) -> dict[str, str] | None:
            del session_id, message_id, attachment_index
            return {
                "bucket": "bucket-test",
                "path": "agent-inputs/other-user/other-thread/run-1/a.png",
                "mimeType": "image/png",
            }

    service = AgentService(
        repository=_BadPathRepository(),
        queue=_FakeQueue(),
        stream=_FakeStream(),
        attachment_storage=_FakeAttachmentStorage(),
    )

    with pytest.raises(HTTPException) as exc_info:
        await service.get_attachment_preview(
            thread_id="00000000-0000-0000-0000-000000000001",
            message_id="00000000-0000-0000-0000-000000000010",
            attachment_index=0,
            current_user=_user(),
        )

    assert exc_info.value.status_code == 403


async def test_asr_service_parses_dict_output_sentence(monkeypatch) -> None:
    result = SimpleNamespace(
        status_code=200,
        message="ok",
        output={"sentence": {"text": "你好，世界"}},
        request_id="req-test",
    )

    class _FakeRecognition:
        def __init__(self, **kwargs) -> None:
            del kwargs

        def call(self, *, file: str):
            del file
            return result

    monkeypatch.setattr(agent_service_module, "Recognition", _FakeRecognition)
    monkeypatch.setattr(AsrService, "_get_api_key", lambda self: "test-key")
    service = AsrService()

    transcript = await service.transcribe_file("/tmp/test.wav", "test.wav")

    assert transcript == "你好，世界"


async def test_asr_service_parses_sentence_when_result_is_dict(monkeypatch) -> None:
    result = {
        "status_code": 200,
        "message": "ok",
        "output": {"sentence": {"text": "字典结果"}},
        "request_id": "req-dict",
    }

    class _FakeRecognition:
        def __init__(self, **kwargs) -> None:
            del kwargs

        def call(self, *, file: str):
            del file
            return result

    monkeypatch.setattr(agent_service_module, "Recognition", _FakeRecognition)
    monkeypatch.setattr(AsrService, "_get_api_key", lambda self: "test-key")
    service = AsrService()

    transcript = await service.transcribe_file("/tmp/test.wav", "test.wav")

    assert transcript == "字典结果"


async def test_asr_service_returns_empty_when_sentence_missing(monkeypatch) -> None:
    result = {
        "status_code": 200,
        "message": "ok",
        "output": {},
    }

    class _FakeRecognition:
        def __init__(self, **kwargs) -> None:
            del kwargs

        def call(self, *, file: str):
            del file
            return result

    monkeypatch.setattr(agent_service_module, "Recognition", _FakeRecognition)
    monkeypatch.setattr(AsrService, "_get_api_key", lambda self: "test-key")
    service = AsrService()

    transcript = await service.transcribe_file("/tmp/test.wav", "test.wav")

    assert transcript == ""