# -*- coding: utf-8 -*-
"""启动前环境分析：Python 依赖、ffmpeg、Node/npm、端口提示（Linux）。"""
from __future__ import annotations

import importlib.util
import shutil
import socket
import subprocess
import sys


def _has_module(name: str) -> bool:
    return importlib.util.find_spec(name) is not None


def _local_ips() -> list[str]:
    out: list[str] = []
    try:
        hostname = socket.gethostname()
        for info in socket.getaddrinfo(hostname, None, family=socket.AF_INET):
            ip = info[4][0]
            if ip and not ip.startswith("127.") and ip not in out:
                out.append(ip)
    except OSError:
        pass
    return out[:4]


def _node_major() -> tuple[int | None, str | None]:
    node = shutil.which("node")
    if not node:
        return None, None
    try:
        raw = subprocess.check_output([node, "-v"], stderr=subprocess.STDOUT, text=True).strip()
    except Exception:
        return None, node
    try:
        major = int(raw.lstrip("v").split(".", 1)[0])
    except Exception:
        major = None
    return major, f"{node} ({raw})"


def print_env_report(
    *,
    dev: bool,
    need_npm: bool,
    host: str,
    port: str,
    next_port: str = "3000",
) -> None:
    print()
    print("┌── 环境检测 ─────────────────────────────────────────")
    print(f"│ 系统: {sys.platform}  Python: {sys.version.split()[0]}")
    ok = True
    for mod, label in (
        ("fastapi", "FastAPI"),
        ("uvicorn", "Uvicorn"),
    ):
        if _has_module(mod):
            print(f"│ ✓ {label} 已安装")
        else:
            print(f"│ ✕ 缺少 {label}，请执行: pip install -r requirements.txt")
            ok = False

    ff = shutil.which("ffmpeg")
    fp = shutil.which("ffplay")
    if ff:
        print(f"│ ✓ ffmpeg: {ff}")
    else:
        print("│ ⚠ 未找到 ffmpeg（推流/录制/OBS 拉流会失败；Docker 镜像已内置）")
        ok = False
    if fp:
        print(f"│ ✓ ffplay: {fp}")
    else:
        print("│ ⚠ 未找到 ffplay（HDMI 全屏播放需要完整 ffmpeg 套件）")

    if need_npm:
        major, node_desc = _node_major()
        npm = shutil.which("npm")
        docker = shutil.which("docker")
        if node_desc:
            if major is not None and major < 18:
                print(f"│ ⚠ Node: {node_desc}（Next.js 推荐 Node 18+；可自动尝试 Docker 兜底）")
            else:
                print(f"│ ✓ Node: {node_desc}")
        else:
            print("│ ✕ 未找到 Node.js（Next.js 构建/开发需要 Node 18+ 或 Docker 兜底）")
            ok = False
        if npm:
            print(f"│ ✓ npm: {npm}")
        else:
            print("│ ⚠ 未找到 npm（若有 Node 18+ 通常可用；否则请安装完整 Node 或启用 Docker）")
        if docker:
            print(f"│ ✓ Docker: {docker}")
        elif major is None or (major is not None and major < 18):
            print("│ ⚠ 无 Docker 时，Node 过低会依赖本机升级才能构建前端")

    print("│")
    print("│ 同机端口提示（若冲突请在 config/runtime.env 修改 PORT）：")
    print("│   本控制台 API/Web 使用环境变量 PORT（默认见 launch.py）")
    print("│   SRS 常见: 1935/1985/8080/10080 等；代理常见: 7890/9090；Chrome 远程: 9222")
    print("│")
    print(f"│ 监听: {host}:{port}")
    if dev:
        ips = _local_ips()
        print(f"│ 开发 UI: 0.0.0.0:{next_port}（局域网可用本机 IP 访问）")
        if ips:
            print(f"│ 示例: http://{ips[0]}:{next_port}/")
    else:
        if host == "0.0.0.0":
            ips = _local_ips()
            if ips:
                print(f"│ 局域网访问示例: http://{ips[0]}:{port}/")
            else:
                print("│ 局域网访问: http://<本机IP>:%s/" % port)
    print("└────────────────────────────────────────────────────")
    print()
    if not ok and not dev:
        print("[env] 存在警告，仍可尝试启动；若运行失败请按上述提示补全依赖。\n")