"""白板 WebSocket 端到端烟测（文本记事本）：两客户端实时同步 + 心跳 + 清空。

验证：
1. 客户端 A 连入 -> 收到 init（含 content/version）
2. 客户端 B 连入 -> 收到 init
3. A 编辑文本 -> B 收到 update（A 不收自己的）
4. 心跳 ping -> pong
5. A 清空 -> A、B 都收到 cleared
6. 持久化：重连后 init 应返回清空后的内容
7. edit_count 累计
"""

from __future__ import annotations

import asyncio
import json
import urllib.request

import websockets

BASE_WS = "ws://127.0.0.1:6867/api/ws/wb"
BOARD = "e2etest"


async def recv_msg(ws, timeout=2.0) -> dict | None:
    try:
        raw = await asyncio.wait_for(ws.recv(), timeout=timeout)
        return json.loads(raw)
    except asyncio.TimeoutError:
        return None


async def main() -> None:
    async with websockets.connect(f"{BASE_WS}/{BOARD}") as a, \
               websockets.connect(f"{BASE_WS}/{BOARD}") as b:
        await a.send(json.dumps({"type": "hello", "client_id": "A"}))
        await b.send(json.dumps({"type": "hello", "client_id": "B"}))

        init_a = await recv_msg(a)
        init_b = await recv_msg(b)
        print("A init:", init_a.get("type") if init_a else None)
        print("B init:", init_b.get("type") if init_b else None)
        assert init_a and init_a["type"] == "init"
        assert init_b and init_b["type"] == "init"

        # A 编辑文本
        text = "Hello, this is a shared note.\nSecond line."
        await a.send(json.dumps({"type": "edit", "content": text}))
        # A 不应收到自己的 update
        echo = await recv_msg(a, timeout=1.0)
        print("A self-echo (expect None):", echo)
        assert echo is None, "发送者不应收到自己的 update"
        # B 应收到 update
        got = await recv_msg(b)
        print("B recv:", got.get("type") if got else None, "content=", repr(got.get("content")) if got else None)
        assert got and got["type"] == "update" and got["client_id"] == "A"
        assert got["content"] == text

        # 心跳
        await a.send(json.dumps({"type": "ping"}))
        pong = await recv_msg(a)
        print("A pong:", pong.get("type") if pong else None)
        assert pong and pong["type"] == "pong"

        # 清空 -> 两端都收 cleared
        await b.send(json.dumps({"type": "clear"}))
        cleared_b = await recv_msg(b)
        cleared_a = await recv_msg(a)
        print("B cleared:", cleared_b.get("type") if cleared_b else None,
              "A cleared:", cleared_a.get("type") if cleared_a else None)
        assert cleared_b and cleared_b["type"] == "cleared" and cleared_b["client_id"] == "B"
        assert cleared_a and cleared_a["type"] == "cleared" and cleared_a["client_id"] == "B"

    # 验证持久化：重连后 init 应 content 为空（已清空）
    async with websockets.connect(f"{BASE_WS}/{BOARD}") as c:
        await c.send(json.dumps({"type": "hello", "client_id": "C"}))
        init_c = await recv_msg(c)
        print("C init after clear, content=", repr(init_c.get("content")) if init_c else None)
        assert init_c and init_c["type"] == "init"
        assert init_c["content"] == "", "清空后重连应得到空 content"

    # 验证 edit_count 累计（1 次编辑 + 1 次清空 = 2）
    with urllib.request.urlopen(f"http://127.0.0.1:6867/api/wb/{BOARD}") as r:
        meta = json.load(r)
    print("edit_count after ops:", meta["edit_count"])
    assert meta["edit_count"] == 2, "1 编辑 + 1 清空 = 2 次"

    print("\nWS 端到端全部通过 ✅")


if __name__ == "__main__":
    asyncio.run(main())