#!/usr/bin/env python3
"""LocalNav 一键部署：环境检测、生成 .env、安装依赖。"""

from __future__ import annotations

import os
import platform
import secrets
import shutil
import subprocess
import sys
from pathlib import Path

ROOT = Path(__file__).resolve().parent.parent
ENV_EXAMPLE = ROOT / ".env.example"
ENV_FILE = ROOT / ".env"
VENV_DIR = ROOT / ".venv"
REQUIREMENTS = ROOT / "requirements.txt"

MIN_PYTHON = (3, 10)

DEFAULTS = {
    "NAV_ADMIN_USERNAME": "admin",
    "NAV_ADMIN_PASSWORD": "admin123",
    "NAV_HUB_AUTO_LOGIN": "1",
    "NAV_COOKIES_INSECURE_HTTP": "1",
}


def _ok(msg: str) -> None:
    print(f"[OK] {msg}")


def _warn(msg: str) -> None:
    print(f"[WARN] {msg}")


def _fail(msg: str) -> None:
    print(f"[FAIL] {msg}", file=sys.stderr)
    sys.exit(1)


def check_python() -> str:
    ver = sys.version_info
    if ver < MIN_PYTHON:
        _fail(f"需要 Python {MIN_PYTHON[0]}.{MIN_PYTHON[1]}+，当前 {ver.major}.{ver.minor}")
    _ok(f"Python {ver.major}.{ver.minor}.{ver.micro}")
    return sys.executable


def check_pip(py_exe: str) -> None:
    try:
        subprocess.run(
            [py_exe, "-m", "pip", "--version"],
            check=True,
            capture_output=True,
            text=True,
        )
        _ok("pip 可用")
    except (subprocess.CalledProcessError, FileNotFoundError):
        _fail("pip 不可用，请先安装 pip")


def optional_tools() -> None:
    for name in ("git", "pm2"):
        if shutil.which(name):
            _ok(f"可选工具 {name} 已安装")
        else:
            _warn(f"未检测到 {name}（可选）")


def read_env_lines(path: Path) -> list[str]:
    if not path.is_file():
        return []
    return path.read_text(encoding="utf-8-sig").splitlines()


def parse_env_keys(lines: list[str]) -> dict[str, str]:
    out: dict[str, str] = {}
    for line in lines:
        s = line.strip()
        if not s or s.startswith("#") or "=" not in s:
            continue
        key, _, val = s.partition("=")
        out[key.strip()] = val.strip()
    return out


def write_env(lines: list[str], updates: dict[str, str]) -> None:
    existing = parse_env_keys(lines)
    merged = {**existing, **updates}
    out_lines: list[str] = []
    written: set[str] = set()

    for line in lines:
        s = line.strip()
        if not s or s.startswith("#") or "=" not in s:
            out_lines.append(line)
            continue
        key, _, _ = s.partition("=")
        key = key.strip()
        if key in merged and key not in written:
            out_lines.append(f"{key}={merged[key]}")
            written.add(key)
        else:
            out_lines.append(line)

    for key, val in merged.items():
        if key not in written:
            out_lines.append(f"{key}={val}")
    ENV_FILE.write_text("\n".join(out_lines) + "\n", encoding="utf-8")


def ensure_env() -> None:
    if not ENV_FILE.is_file():
        if ENV_EXAMPLE.is_file():
            shutil.copy2(ENV_EXAMPLE, ENV_FILE)
            _ok("已从 .env.example 创建 .env")
        else:
            ENV_FILE.write_text("", encoding="utf-8")
            _ok("已创建空 .env")

    lines = read_env_lines(ENV_FILE)
    parsed = parse_env_keys(lines)
    updates: dict[str, str] = {}

    secret = parsed.get("NAV_SECRET_KEY", "").strip()
    if not secret:
        updates["NAV_SECRET_KEY"] = secrets.token_hex(32)
        _ok("已自动生成 NAV_SECRET_KEY")

    for key, val in DEFAULTS.items():
        if not parsed.get(key, "").strip():
            updates[key] = val

    if updates:
        write_env(lines, updates)
        _ok(f"已写入 .env 配置项：{', '.join(updates.keys())}")
    else:
        _ok(".env 已完整，未覆盖现有配置")


def venv_python() -> str:
    if platform.system() == "Windows":
        py = VENV_DIR / "Scripts" / "python.exe"
    else:
        py = VENV_DIR / "bin" / "python"
    return str(py)


def ensure_venv(base_py: str) -> str:
    if not VENV_DIR.is_dir():
        subprocess.run([base_py, "-m", "venv", str(VENV_DIR)], check=True)
        _ok(f"已创建虚拟环境 {VENV_DIR}")
    else:
        _ok("虚拟环境已存在")
    return venv_python()


def install_requirements(py_exe: str) -> None:
    cmd = [py_exe, "-m", "pip", "install", "-r", str(REQUIREMENTS)]
    try:
        subprocess.run(cmd, check=True, cwd=ROOT)
    except subprocess.CalledProcessError:
        _warn("默认 pip 源失败，尝试 https://pypi.org/simple")
        subprocess.run([*cmd, "-i", "https://pypi.org/simple"], check=True, cwd=ROOT)
    _ok("依赖安装完成")


def smoke_test(py_exe: str) -> None:
    subprocess.run(
        [
            py_exe,
            "-c",
            "from app import create_app; create_app(); print('app import ok')",
        ],
        check=True,
        cwd=ROOT,
    )
    _ok("应用启动检查通过")


def print_summary() -> None:
    port = os.environ.get("NAV_PORT", "5070")
    print()
    print("=" * 50)
    print("部署完成")
    print(f"  访问地址: http://0.0.0.0:{port}")
    print("  默认账号: admin / admin123")
    print("  生产环境请尽快在「系统设置」中修改密码")
    print()
    print("启动方式（任选其一）：")
    if platform.system() == "Windows":
        print(f"  {venv_python()} app.py")
    else:
        print(f"  {venv_python()} app.py")
        print("  pm2 start ecosystem.config.cjs")
    print("=" * 50)


def main() -> None:
    print(f"LocalNav 一键部署 · {platform.system()} {platform.release()}")
    print(f"项目目录: {ROOT}")
    print()

    base_py = check_python()
    check_pip(base_py)
    optional_tools()
    ensure_env()
    py_exe = ensure_venv(base_py)
    install_requirements(py_exe)
    smoke_test(py_exe)
    print_summary()


if __name__ == "__main__":
    main()