from __future__ import annotations

import json
import socket
import threading
import time
from uuid import UUID

from playwright.sync_api import sync_playwright
import uvicorn

from app import app
from v1.agent_chat.dependencies import get_agent_chat_service
from v1.agent_chat.schemas import (
    AgentChatEvent,
    AgentChatRunRequest,
    AgentChatRunResponse,
)
from v1.agent_chat.service import AgentChatService


class FakeE2EAgentChatService(AgentChatService):
    def __init__(self) -> None:
        return None

    async def run(self, payload: AgentChatRunRequest) -> AgentChatRunResponse:
        session_id = payload.session_id or UUID("00000000-0000-0000-0000-000000000001")
        return AgentChatRunResponse(
            session_id=session_id,
            output=payload.message,
            events=[
                AgentChatEvent(type="run.started", run_id=str(session_id)),
                AgentChatEvent(
                    type="message.delta", message_id="m1", delta=payload.message
                ),
                AgentChatEvent(
                    type="run.completed", run_id=str(session_id), output=payload.message
                ),
            ],
        )


def _find_free_port() -> int:
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
        sock.bind(("127.0.0.1", 0))
        return sock.getsockname()[1]


def _wait_for_port(host: str, port: int, timeout: float = 5.0) -> None:
    deadline = time.time() + timeout
    while time.time() < deadline:
        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
            if sock.connect_ex((host, port)) == 0:
                return
        time.sleep(0.05)
    raise RuntimeError("Server did not start in time")


def _start_server(host: str, port: int):
    config = uvicorn.Config(app, host=host, port=port, log_level="info")
    server = uvicorn.Server(config)
    thread = threading.Thread(target=server.run, daemon=True)
    thread.start()
    _wait_for_port(host, port)
    return server, thread


def test_agent_chat_flow_e2e() -> None:
    app.dependency_overrides[get_agent_chat_service] = lambda: FakeE2EAgentChatService()
    host = "127.0.0.1"
    port = _find_free_port()
    server, thread = _start_server(host, port)

    try:
        with sync_playwright() as playwright:
            request_context = playwright.request.new_context(
                base_url=f"http://{host}:{port}"
            )
            try:
                response = request_context.post(
                    "/api/v1/agent-chat",
                    data=json.dumps({"message": "hello"}),
                    headers={"Content-Type": "application/json"},
                )
                assert response.status == 200
                body = response.json()
                assert body["output"] == "hello"
                assert [event["type"] for event in body["events"]] == [
                    "run.started",
                    "message.delta",
                    "run.completed",
                ]
            finally:
                request_context.dispose()
    finally:
        app.dependency_overrides = {}
        server.should_exit = True
        thread.join(timeout=5)