#!/usr/bin/env python3
"""LocalNav 一键安装：无需预先克隆，输入仓库地址后自动克隆并部署。"""

from __future__ import annotations

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

DEFAULT_REPO = "https://git.bz121.com/dekun/LocalNav.git"
MIN_PYTHON = (3, 10)


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 default_install_dir() -> Path:
    if platform.system() == "Windows":
        return Path.cwd() / "LocalNav"
    return Path("/opt/LocalNav")


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_git() -> str:
    git = shutil.which("git")
    if not git:
        _fail("未检测到 git，请先安装：Ubuntu 执行 apt install -y git")
    _ok(f"git 可用 ({git})")
    return git


def prompt_value(label: str, default: str) -> str:
    try:
        raw = input(f"{label} [{default}]: ").strip()
    except (EOFError, KeyboardInterrupt):
        print()
        _fail("已取消")
    return raw or default


def resolve_paths(repo: str, dest: Path) -> tuple[str, Path]:
    dest = dest.expanduser().resolve()
    repo = repo.strip()
    if not repo:
        _fail("仓库地址不能为空")
    if dest.name == "" or str(dest).endswith(("/", "\\")):
        _fail("安装目录无效")
    return repo, dest


def is_localnav_project(path: Path) -> bool:
    return (path / "app.py").is_file() and (path / "scripts" / "deploy.py").is_file()


def clone_or_update(git_exe: str, repo: str, dest: Path) -> None:
    if dest.exists() and not dest.is_dir():
        _fail(f"安装路径已存在且不是目录: {dest}")

    if is_localnav_project(dest):
        _ok(f"目录已是 LocalNav 项目，执行 git pull: {dest}")
        subprocess.run([git_exe, "-C", str(dest), "pull", "--ff-only"], check=True)
        return

    if dest.exists():
        if (dest / ".git").is_dir():
            _ok(f"目录为 Git 仓库，执行 git pull: {dest}")
            subprocess.run([git_exe, "-C", str(dest), "pull", "--ff-only"], check=True)
            if not is_localnav_project(dest):
                _fail(f"目录 {dest} 不是 LocalNav 项目（缺少 app.py）")
            return
        _fail(f"目录已存在且不是 Git 仓库: {dest}")

    dest.parent.mkdir(parents=True, exist_ok=True)
    _ok(f"正在克隆 {repo} -> {dest}")
    subprocess.run([git_exe, "clone", repo, str(dest)], check=True)
    if not is_localnav_project(dest):
        _fail("克隆完成但未找到 app.py，请检查仓库地址是否正确")


def run_project_setup(py_exe: str, project_dir: Path) -> None:
    deploy_script = project_dir / "scripts" / "deploy.py"
    if not deploy_script.is_file():
        _fail(f"未找到部署脚本: {deploy_script}")
    _ok(f"开始项目内安装: {project_dir}")
    subprocess.run([py_exe, str(deploy_script)], cwd=project_dir, check=True)


def parse_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser(description="LocalNav 一键安装（自动克隆 + 部署）")
    parser.add_argument(
        "--repo",
        default="",
        help=f"Git 仓库地址（默认 {DEFAULT_REPO}）",
    )
    parser.add_argument(
        "--dir",
        default="",
        help="安装目录（Linux 默认 /opt/LocalNav，Windows 默认 ./LocalNav）",
    )
    parser.add_argument(
        "-y",
        "--yes",
        action="store_true",
        help="使用默认仓库与安装目录，不交互提问",
    )
    return parser.parse_args()


def main() -> None:
    args = parse_args()
    print(f"LocalNav 一键安装 · {platform.system()} {platform.release()}")
    print("无需预先克隆，将自动拉取代码并完成部署。")
    print()

    py_exe = check_python()
    git_exe = check_git()

    default_dest = default_install_dir()
    if args.yes:
        repo = args.repo.strip() or DEFAULT_REPO
        dest = Path(args.dir).expanduser() if args.dir.strip() else default_dest
    else:
        repo = args.repo.strip() or prompt_value("Git 仓库地址", DEFAULT_REPO)
        dest_str = args.dir.strip() or prompt_value("安装目录", str(default_dest))
        dest = Path(dest_str)

    repo, dest = resolve_paths(repo, dest)
    print()
    print(f"  仓库: {repo}")
    print(f"  目录: {dest}")
    print()

    clone_or_update(git_exe, repo, dest)
    run_project_setup(py_exe, dest)

    print()
    print(f"安装目录: {dest}")
    print(f"进入目录: cd {dest}")


if __name__ == "__main__":
    main()