from __future__ import annotations

import json

from external_connector.providers.weixin_ilink import WeixinIlinkProvider
from external_connector.state import SidecarStateStore


class FakeResponse:
    def __init__(self, payload: dict[str, object]) -> None:
        self.payload = payload
        self.text = json.dumps(payload)
        self.status_code = 200
        self.is_success = True

    def raise_for_status(self) -> None:
        return None

    def json(self) -> dict[str, object]:
        return self.payload


class FakeHttpClient:
    def __init__(self) -> None:
        self.posts: list[tuple[str, dict[str, object] | None, dict[str, str] | None]] = []
        self.gets: list[str] = []

    def post(self, url: str, *, json: dict[str, object] | None = None, headers: dict[str, str] | None = None, timeout: float | None = None) -> FakeResponse:
        self.posts.append((url, json, headers))
        if "get_bot_qrcode" in url:
            return FakeResponse({"qrcode": "qr-token", "qrcode_img_content": "https://scan.example/qr"})
        if "sendmessage" in url:
            return FakeResponse({"ret": 0})
        if "getupdates" in url:
            return FakeResponse(
                {
                    "ret": 0,
                    "get_updates_buf": "next-buf",
                    "msgs": [
                        {
                            "message_id": 42,
                            "from_user_id": "wx-user",
                            "to_user_id": "wx-bot",
                            "context_token": "ctx-1",
                            "item_list": [{"type": 1, "text_item": {"text": "hello"}}],
                        }
                    ],
                }
            )
        raise AssertionError(url)

    def get(self, url: str, *, headers: dict[str, str] | None = None, timeout: float | None = None) -> FakeResponse:
        self.gets.append(url)
        return FakeResponse(
            {
                "status": "confirmed",
                "bot_token": "bot-token",
                "ilink_bot_id": "bot-1@im.bot",
                "baseurl": "https://api.weixin.example",
                "ilink_user_id": "wx-owner",
            }
        )


class BusinessFailingSendHttpClient(FakeHttpClient):
    def post(self, url: str, *, json: dict[str, object] | None = None, headers: dict[str, str] | None = None, timeout: float | None = None) -> FakeResponse:
        self.posts.append((url, json, headers))
        if "sendmessage" in url:
            return FakeResponse({"ret": 47001, "errmsg": "invalid receiver"})
        return super().post(url, json=json, headers=headers, timeout=timeout)


class ScannedAfterConnectedHttpClient(FakeHttpClient):
    def __init__(self) -> None:
        super().__init__()
        self.get_count = 0

    def get(self, url: str, *, headers: dict[str, str] | None = None, timeout: float | None = None) -> FakeResponse:
        self.gets.append(url)
        self.get_count += 1
        if self.get_count == 1:
            return FakeResponse(
                {
                    "status": "confirmed",
                    "bot_token": "bot-token",
                    "ilink_bot_id": "bot-1@im.bot",
                    "baseurl": "https://api.weixin.example",
                    "ilink_user_id": "wx-owner",
                }
            )
        return FakeResponse({"status": "scaned"})


def test_weixin_ilink_provider_starts_real_qr_session(tmp_path) -> None:
    http = FakeHttpClient()
    provider = WeixinIlinkProvider(
        store=SidecarStateStore(tmp_path / "state.json"),
        http_client=http,
        bridge_base_url="http://beaver:8080",
        bridge_token="bridge-token",
        start_receivers=False,
    )

    session = provider.start_session(
        {
            "kind": "weixin",
            "connectionId": "conn_1",
            "channelId": "weixin-main",
            "displayName": "Weixin Main",
            "callbackBaseUrl": "http://beaver:8080",
            "options": {},
        }
    )

    assert session["status"] == "qr_ready"
    assert session["qrCode"] == "https://scan.example/qr"
    assert session["qrImage"].startswith("data:image/svg+xml;base64,")
    assert http.posts[0][0].endswith("/ilink/bot/get_bot_qrcode?bot_type=3")


def test_weixin_ilink_provider_connects_on_confirmed_status(tmp_path) -> None:
    http = FakeHttpClient()
    provider = WeixinIlinkProvider(
        store=SidecarStateStore(tmp_path / "state.json"),
        http_client=http,
        bridge_base_url="http://beaver:8080",
        bridge_token="bridge-token",
        start_receivers=False,
    )
    session = provider.start_session(
        {
            "kind": "weixin",
            "connectionId": "conn_1",
            "channelId": "weixin-main",
            "displayName": "Weixin Main",
            "callbackBaseUrl": "http://beaver:8080",
            "options": {},
        }
    )

    connected = provider.get_session(session["sessionId"])

    assert connected["status"] == "connected"
    assert connected["accountId"] == "weixin:bot-1@im.bot"
    assert connected["displayName"] == "Weixin Main"


def test_weixin_ilink_provider_does_not_downgrade_token_session_to_scanned(tmp_path) -> None:
    http = ScannedAfterConnectedHttpClient()
    provider = WeixinIlinkProvider(
        store=SidecarStateStore(tmp_path / "state.json"),
        http_client=http,
        bridge_base_url="http://beaver:8080",
        bridge_token="bridge-token",
        start_receivers=False,
    )
    session = provider.start_session(
        {
            "kind": "weixin",
            "connectionId": "conn_1",
            "channelId": "weixin-main",
            "displayName": "Weixin Main",
            "callbackBaseUrl": "http://beaver:8080",
            "options": {},
        }
    )
    connected = provider.get_session(session["sessionId"])
    refreshed = provider.get_session(session["sessionId"])

    assert connected["status"] == "connected"
    assert refreshed["status"] == "connected"
    assert refreshed["accountId"] == "weixin:bot-1@im.bot"


def test_weixin_ilink_provider_recovers_token_session_persisted_as_scanned(tmp_path) -> None:
    store = SidecarStateStore(tmp_path / "state.json")
    provider = WeixinIlinkProvider(
        store=store,
        http_client=FakeHttpClient(),
        bridge_base_url="http://beaver:8080",
        bridge_token="bridge-token",
        start_receivers=False,
    )
    session = store.create_session(
        kind="weixin",
        connection_id="conn_1",
        channel_id="weixin-main",
        display_name="Weixin Main",
        options={},
    )
    session = store.update_session(
        session.session_id,
        status="scanned",
        account_id="weixin:bot-1@im.bot",
        metadata={
            "token": "bot-token",
            "baseUrl": "https://api.weixin.example",
            "userId": "wx-owner",
            "getUpdatesBuf": "buf",
        },
    )

    recovered = provider.get_session(session.session_id)

    assert recovered["status"] == "connected"
    assert recovered["accountId"] == "weixin:bot-1@im.bot"


def test_weixin_ilink_provider_starts_existing_connected_receiver_on_startup(tmp_path) -> None:
    store = SidecarStateStore(tmp_path / "state.json")
    session = store.create_session(
        kind="weixin",
        connection_id="conn_1",
        channel_id="weixin-main",
        display_name="Weixin Main",
        options={},
    )
    store.update_session(
        session.session_id,
        status="connected",
        account_id="weixin:bot-1@im.bot",
        metadata={
            "token": "bot-token",
            "baseUrl": "https://api.weixin.example",
            "userId": "wx-owner",
            "getUpdatesBuf": "buf",
        },
    )

    provider = WeixinIlinkProvider(
        store=store,
        http_client=FakeHttpClient(),
        bridge_base_url="http://beaver:8080",
        bridge_token="bridge-token",
    )

    assert "conn_1" in provider._receiver_stops
    provider.logout("conn_1")


def test_weixin_ilink_provider_send_uses_saved_token_and_dedupes(tmp_path) -> None:
    http = FakeHttpClient()
    provider = WeixinIlinkProvider(
        store=SidecarStateStore(tmp_path / "state.json"),
        http_client=http,
        bridge_base_url="http://beaver:8080",
        bridge_token="bridge-token",
        start_receivers=False,
    )
    session = provider.start_session(
        {
            "kind": "weixin",
            "connectionId": "conn_1",
            "channelId": "weixin-main",
            "displayName": "Weixin Main",
            "callbackBaseUrl": "http://beaver:8080",
            "options": {},
        }
    )
    provider.get_session(session["sessionId"])
    payload = {
        "requestId": "out_1",
        "connectionId": "conn_1",
        "channelId": "weixin-main",
        "kind": "weixin",
        "target": {"peerId": "wx-user", "peerType": "dm", "threadId": None},
        "content": "reply",
        "metadata": {"contextToken": "ctx-1"},
    }

    first = provider.send(payload)
    second = provider.send(payload)

    send_posts = [item for item in http.posts if "sendmessage" in item[0]]
    assert first == second
    assert first["ok"] is True
    assert len(send_posts) == 1
    assert send_posts[0][2]["Authorization"] == "Bearer bot-token"
    assert send_posts[0][1]["msg"]["from_user_id"] == ""
    assert send_posts[0][1]["msg"]["to_user_id"] == "wx-user"
    assert send_posts[0][1]["msg"]["client_id"] == "out_1"
    assert send_posts[0][1]["msg"]["message_type"] == 2
    assert send_posts[0][1]["msg"]["message_state"] == 2
    assert send_posts[0][1]["msg"]["context_token"] == "ctx-1"
    assert send_posts[0][1]["msg"]["item_list"][0]["text_item"]["text"] == "reply"


def test_weixin_ilink_provider_send_uses_cached_context_token(tmp_path) -> None:
    http = FakeHttpClient()
    provider = WeixinIlinkProvider(
        store=SidecarStateStore(tmp_path / "state.json"),
        http_client=http,
        bridge_base_url="http://beaver:8080",
        bridge_token="bridge-token",
        bridge_post=lambda url, payload, headers: None,
        start_receivers=False,
    )
    session = provider.start_session(
        {
            "kind": "weixin",
            "connectionId": "conn_1",
            "channelId": "weixin-main",
            "displayName": "Weixin Main",
            "callbackBaseUrl": "http://beaver:8080",
            "options": {},
        }
    )
    provider.get_session(session["sessionId"])
    provider.poll_once("conn_1")

    result = provider.send(
        {
            "requestId": "out_2",
            "connectionId": "conn_1",
            "channelId": "weixin-main",
            "kind": "weixin",
            "target": {"peerId": "wx-user", "peerType": "dm", "threadId": None},
            "content": "reply",
            "metadata": {},
        }
    )

    send_posts = [item for item in http.posts if "sendmessage" in item[0]]
    assert result["ok"] is True
    assert send_posts[-1][1]["msg"]["context_token"] == "ctx-1"


def test_weixin_ilink_provider_send_uses_safe_client_id_for_platform(tmp_path) -> None:
    http = FakeHttpClient()
    provider = WeixinIlinkProvider(
        store=SidecarStateStore(tmp_path / "state.json"),
        http_client=http,
        bridge_base_url="http://beaver:8080",
        bridge_token="bridge-token",
        start_receivers=False,
    )
    session = provider.start_session(
        {
            "kind": "weixin",
            "connectionId": "conn_1",
            "channelId": "weixin-main",
            "displayName": "Weixin Main",
            "callbackBaseUrl": "http://beaver:8080",
            "options": {},
        }
    )
    provider.get_session(session["sessionId"])

    provider.send(
        {
            "requestId": "out_weixin-main:account@im.bot:peer@im.wechat:msg-1",
            "connectionId": "conn_1",
            "channelId": "weixin-main",
            "kind": "weixin",
            "target": {"peerId": "wx-user", "peerType": "dm", "threadId": None},
            "content": "reply",
            "metadata": {"contextToken": "ctx-1"},
        }
    )

    send_posts = [item for item in http.posts if "sendmessage" in item[0]]
    client_id = send_posts[-1][1]["msg"]["client_id"]
    assert client_id.startswith("beaver-weixin-")
    assert ":" not in client_id
    assert "@" not in client_id


def test_weixin_ilink_provider_send_rejects_business_error_without_completing(tmp_path) -> None:
    http = BusinessFailingSendHttpClient()
    store = SidecarStateStore(tmp_path / "state.json")
    provider = WeixinIlinkProvider(
        store=store,
        http_client=http,
        bridge_base_url="http://beaver:8080",
        bridge_token="bridge-token",
        start_receivers=False,
    )
    session = provider.start_session(
        {
            "kind": "weixin",
            "connectionId": "conn_1",
            "channelId": "weixin-main",
            "displayName": "Weixin Main",
            "callbackBaseUrl": "http://beaver:8080",
            "options": {},
        }
    )
    provider.get_session(session["sessionId"])
    payload = {
        "requestId": "out_1",
        "connectionId": "conn_1",
        "channelId": "weixin-main",
        "kind": "weixin",
        "target": {"peerId": "wx-user", "peerType": "dm", "threadId": None},
        "content": "reply",
        "metadata": {},
    }

    result = provider.send(payload)
    retry = store.begin_send(connection_id="conn_1", request_id="out_1")

    assert result["ok"] is False
    assert "invalid receiver" in result["error"]
    assert retry.should_send is True


def test_weixin_ilink_provider_poll_once_forwards_bridge_event(tmp_path) -> None:
    http = FakeHttpClient()
    bridge_posts: list[tuple[str, dict[str, object], dict[str, str]]] = []

    def bridge_post(url: str, payload: dict[str, object], headers: dict[str, str]) -> None:
        bridge_posts.append((url, payload, headers))

    provider = WeixinIlinkProvider(
        store=SidecarStateStore(tmp_path / "state.json"),
        http_client=http,
        bridge_base_url="http://beaver:8080",
        bridge_token="bridge-token",
        bridge_post=bridge_post,
        start_receivers=False,
    )
    session = provider.start_session(
        {
            "kind": "weixin",
            "connectionId": "conn_1",
            "channelId": "weixin-main",
            "displayName": "Weixin Main",
            "callbackBaseUrl": "http://beaver:8080",
            "options": {},
        }
    )
    provider.get_session(session["sessionId"])

    provider.poll_once("conn_1")

    assert bridge_posts[0][0] == "http://beaver:8080/api/channel-connector-bridge/events"
    assert bridge_posts[0][2]["Authorization"] == "Bearer bridge-token"
    assert bridge_posts[0][1]["eventId"] == "weixin-main:42"
    assert bridge_posts[0][1]["content"] == "hello"
    assert bridge_posts[0][1]["peerId"] == "wx-user"