"""浏览器自动化服务：解析场景 + 启动 dev server + 执行步骤。"""

from __future__ import annotations

import asyncio
import logging
from urllib.parse import urlparse

from browser_executor import run_browser_scenario_sync
from browser_models import BrowserResult, BrowserScenario
from browser_parser import parse_browser_request
from preview_service import (
    _package_dev_script,
    _preview_port,
    _project_cwd,
    _startup_timeout,
    _wait_for_port,
)

logger = logging.getLogger(__name__)


def _ensure_dev_server(base_url: str) -> bool:
    parsed = urlparse(base_url)
    host = parsed.hostname or "127.0.0.1"
    port = parsed.port or (443 if parsed.scheme == "https" else 80)

    if _wait_for_port(host, port, timeout=3):
        return False

    cwd = _project_cwd()
    dev_command = _package_dev_script(cwd)
    if not dev_command:
        raise RuntimeError(
            f"无法访问 {base_url}，且未找到可启动的 dev 脚本。"
            "请先手动启动前端，或设置 PREVIEW_URL。"
        )

    import subprocess

    logger.info("启动 dev server: %s (cwd=%s)", dev_command, cwd)
    proc = subprocess.Popen(
        dev_command,
        cwd=str(cwd),
        shell=True,
        stdout=subprocess.DEVNULL,
        stderr=subprocess.PIPE,
    )
    if not _wait_for_port(host, port, timeout=_startup_timeout()):
        err = ""
        if proc.stderr:
            err = proc.stderr.read().decode("utf-8", errors="replace")[-1000:]
        proc.kill()
        raise RuntimeError(
            f"dev server 在 {_startup_timeout()}s 内未就绪 ({base_url})。"
            f"{(' 日志: ' + err) if err else ''}"
        )
    return True


async def run_browser_automation(text: str) -> BrowserResult:
    scenario = parse_browser_request(text)
    if scenario is None:
        raise RuntimeError("无法解析网页操作步骤")

    started = await asyncio.to_thread(_ensure_dev_server, scenario.base_url)
    result = await asyncio.to_thread(run_browser_scenario_sync, scenario)
    result.started_dev_server = started
    return result


def format_browser_caption(result: BrowserResult) -> str:
    lines = [
        "**网页操作完成**",
        f"> 场景：`{result.scenario_name or '自定义'}`",
        f"> 起始：`{result.base_url}`",
        f"> 最终：`{result.final_url}`",
        f"> 步骤数：{result.step_count}",
    ]
    if result.started_dev_server:
        lines.append("> dev server：已自动启动")
    if result.step_log:
        lines.append("")
        lines.append("执行记录：")
        for item in result.step_log[-8:]:
            lines.append(f"- {item}")
    return "\n".join(lines)