from __future__ import annotations

import asyncio

import pytest
from httpx import AsyncClient


TEST_CHANNEL = "telegram"
TEST_NS = "pytest"
TEST_KEY_PREFIX = "test_state_entry"


def _make_key(suffix: str = "") -> str:
    return f"{TEST_KEY_PREFIX}_{suffix}" if suffix else TEST_KEY_PREFIX


def _url(channel: str = TEST_CHANNEL, ns: str = TEST_NS, key: str = "") -> str:
    return f"/api/channels/{channel}/state/{ns}/{key or _make_key()}"


@pytest.mark.integration
class TestChannelStateEntryWrite:
    async def test_write_and_read_back(self, test_client: AsyncClient, admin_headers: dict):
        key = _make_key("readback")
        put_resp = await test_client.put(
            _url(key=key),
            json={"value": {"a": 1}},
            headers=admin_headers,
        )
        assert put_resp.status_code in (200, 201)
        put_data = put_resp.json()
        assert put_data["code"] == 0

        get_resp = await test_client.get(_url(key=key), headers=admin_headers)
        assert get_resp.status_code == 200
        get_data = get_resp.json()
        assert get_data["data"]["value"] == {"a": 1}

    async def test_write_with_ttl(self, test_client: AsyncClient, admin_headers: dict):
        key = _make_key("ttl")
        put_resp = await test_client.put(
            _url(key=key),
            json={"value": "temp", "ttl_seconds": 3},
            headers=admin_headers,
        )
        assert put_resp.status_code in (200, 201)

        get_resp = await test_client.get(_url(key=key), headers=admin_headers)
        assert get_resp.status_code == 200
        assert get_resp.json()["data"]["value"] == "temp"

        await asyncio.sleep(4)

        get_expired = await test_client.get(_url(key=key), headers=admin_headers)
        assert get_expired.status_code == 404

    async def test_overwrite_update(self, test_client: AsyncClient, admin_headers: dict):
        key = _make_key("overwrite")

        put1 = await test_client.put(
            _url(key=key),
            json={"value": 1},
            headers=admin_headers,
        )
        assert put1.status_code in (200, 201)

        put2 = await test_client.put(
            _url(key=key),
            json={"value": 2},
            headers=admin_headers,
        )
        assert put2.status_code == 200

        get_resp = await test_client.get(_url(key=key), headers=admin_headers)
        assert get_resp.json()["data"]["value"] == 2

    async def test_first_write_returns_201(self, test_client: AsyncClient, admin_headers: dict):
        key = _make_key("created")

        put_resp = await test_client.put(
            _url(key=key),
            json={"value": "new"},
            headers=admin_headers,
        )
        assert put_resp.status_code == 201
        assert "已创建" in put_resp.json()["message"]

        put2 = await test_client.put(
            _url(key=key),
            json={"value": "updated"},
            headers=admin_headers,
        )
        assert put2.status_code == 200
        assert "已更新" in put2.json()["message"]


@pytest.mark.integration
class TestChannelStateEntryValidation:
    async def test_missing_value(self, test_client: AsyncClient, admin_headers: dict):
        response = await test_client.put(
            _url(key=_make_key("noval")),
            json={"ttl_seconds": 60},
            headers=admin_headers,
        )
        assert response.status_code == 422

    async def test_ttl_seconds_invalid_type(self, test_client: AsyncClient, admin_headers: dict):
        response = await test_client.put(
            _url(key=_make_key("badttl")),
            json={"value": "x", "ttl_seconds": "abc"},
            headers=admin_headers,
        )
        assert response.status_code == 422

    async def test_ttl_seconds_negative(self, test_client: AsyncClient, admin_headers: dict):
        response = await test_client.put(
            _url(key=_make_key("negttl")),
            json={"value": "x", "ttl_seconds": -1},
            headers=admin_headers,
        )
        assert response.status_code == 422

    async def test_ttl_seconds_zero(self, test_client: AsyncClient, admin_headers: dict):
        response = await test_client.put(
            _url(key=_make_key("zerottl")),
            json={"value": "x", "ttl_seconds": 0},
            headers=admin_headers,
        )
        assert response.status_code == 422


@pytest.mark.integration
class TestChannelStateEntryPathValidation:
    async def test_channel_id_too_long(self, test_client: AsyncClient, admin_headers: dict):
        long_id = "a" * 33
        response = await test_client.put(
            f"/api/channels/{long_id}/state/{TEST_NS}/some_key",
            json={"value": "x"},
            headers=admin_headers,
        )
        assert response.status_code == 422

    async def test_namespace_too_long(self, test_client: AsyncClient, admin_headers: dict):
        long_ns = "a" * 65
        response = await test_client.put(
            f"/api/channels/{TEST_CHANNEL}/state/{long_ns}/some_key",
            json={"value": "x"},
            headers=admin_headers,
        )
        assert response.status_code == 422

    async def test_key_too_long(self, test_client: AsyncClient, admin_headers: dict):
        long_key = "a" * 129
        response = await test_client.put(
            f"/api/channels/{TEST_CHANNEL}/state/{TEST_NS}/{long_key}",
            json={"value": "x"},
            headers=admin_headers,
        )
        assert response.status_code == 422


@pytest.mark.integration
class TestChannelStateEntryErrors:
    async def test_nonexistent_channel(self, test_client: AsyncClient, admin_headers: dict):
        response = await test_client.put(
            "/api/channels/ghost-channel/state/default/test_key",
            json={"value": "x"},
            headers=admin_headers,
        )
        assert response.status_code == 404

    async def test_non_admin_rejected(self, test_client: AsyncClient, standard_user: dict):
        response = await test_client.put(
            _url(key=_make_key("noadmin")),
            json={"value": "x"},
            headers=standard_user["headers"],
        )
        assert response.status_code in (401, 403)


@pytest.mark.integration
class TestChannelStateEntryConcurrency:
    async def test_concurrent_writes_same_key(self, test_client: AsyncClient, admin_headers: dict):
        key = _make_key("concurrent")

        async def put_value(v: int):
            return await test_client.put(
                _url(key=key),
                json={"value": v},
                headers=admin_headers,
            )

        tasks = [put_value(i) for i in range(10)]
        responses = await asyncio.gather(*tasks)

        for i, resp in enumerate(responses):
            assert resp.status_code in (200, 201), f"Request {i} failed: {resp.status_code} {resp.text}"

        get_resp = await test_client.get(_url(key=key), headers=admin_headers)
        assert get_resp.status_code == 200
        final_value = get_resp.json()["data"]["value"]
        assert final_value in range(10)