import asyncio
from pathlib import Path
import subprocess
from subprocess import CalledProcessError
from typing import ClassVar

from zhenxun.configs.config import Config
from zhenxun.services.log import logger

LOG_COMMAND = "VirtualEnvPackageManager"

Config.add_plugin_config(
    "virtualenv",
    "python_path",
    None,
    help="虚拟环境python路径，为空时使用系统环境的uv",
)


class VirtualEnvPackageManager:
    DEFAULT_COMMAND: ClassVar[list[str]] = ["uv", "pip"]

    @classmethod
    def __get_command(cls) -> list[str]:
        if path := Config.get_config("virtualenv", "python_path"):
            return [path, "-m", "pip"]
        return cls.DEFAULT_COMMAND.copy()

    @classmethod
    async def install(cls, package: list[str] | str):
        """安装依赖包

        参数:
            package: 安装依赖包名称或列表
        """
        if isinstance(package, str):
            package = [package]
        try:
            command = cls.__get_command()
            command.append("install")
            command.extend(package)
            logger.info(f"执行虚拟环境安装包指令: {command}", LOG_COMMAND)
            result = await asyncio.to_thread(
                subprocess.run,
                command,
                check=True,
                capture_output=True,
                text=True,
                encoding="utf-8",
                errors="replace",
            )
            logger.debug(
                f"安装虚拟环境包指令执行完成: {result.stdout}",
                LOG_COMMAND,
            )
            return result.stdout
        except (CalledProcessError, FileNotFoundError) as e:
            stderr = e.stderr if isinstance(e, CalledProcessError) else str(e)
            logger.error(f"安装虚拟环境包指令执行失败: {stderr}.", LOG_COMMAND)
            return stderr

    @classmethod
    async def uninstall(cls, package: list[str] | str):
        """卸载依赖包

        参数:
            package: 卸载依赖包名称或列表
        """
        if isinstance(package, str):
            package = [package]
        try:
            command = cls.__get_command()
            command.append("uninstall")
            command.extend(package)
            logger.info(f"执行虚拟环境卸载包指令: {command}", LOG_COMMAND)
            result = await asyncio.to_thread(
                subprocess.run,
                command,
                check=True,
                capture_output=True,
                text=True,
                encoding="utf-8",
                errors="replace",
            )
            logger.debug(
                f"卸载虚拟环境包指令执行完成: {result.stdout}",
                LOG_COMMAND,
            )
            return result.stdout
        except (CalledProcessError, FileNotFoundError) as e:
            stderr = e.stderr if isinstance(e, CalledProcessError) else str(e)
            logger.error(f"卸载虚拟环境包指令执行失败: {stderr}.", LOG_COMMAND)
            return stderr

    @classmethod
    async def update(cls, package: list[str] | str):
        """更新依赖包

        参数:
            package: 更新依赖包名称或列表
        """
        if isinstance(package, str):
            package = [package]
        try:
            command = cls.__get_command()
            command.append("install")
            command.append("--upgrade")
            command.extend(package)
            logger.info(f"执行虚拟环境更新包指令: {command}", LOG_COMMAND)
            result = await asyncio.to_thread(
                subprocess.run,
                command,
                check=True,
                capture_output=True,
                text=True,
                encoding="utf-8",
                errors="replace",
            )
            logger.debug(f"更新虚拟环境包指令执行完成: {result.stdout}", LOG_COMMAND)
            return result.stdout
        except (CalledProcessError, FileNotFoundError) as e:
            stderr = e.stderr if isinstance(e, CalledProcessError) else str(e)
            logger.error(f"更新虚拟环境包指令执行失败: {stderr}.", LOG_COMMAND)
            return stderr

    @staticmethod
    def _clean_requirements_file(file_path: Path) -> None:
        """清理 requirements 文件中的非ASCII注释

        防止 Windows 上 pip 使用 GBK 编码读取 UTF-8 文件时出错

        参数:
            file_path: requirements 文件路径
        """
        try:
            content = file_path.read_text(encoding="utf-8")
            lines = content.splitlines()
            cleaned_lines = []
            for line in lines:
                stripped = line.strip()
                # 跳过空行
                if not stripped:
                    continue
                # 如果是注释行且包含非ASCII字符，跳过
                if stripped.startswith("#"):
                    try:
                        stripped.encode("ascii")
                    except UnicodeEncodeError:
                        continue
                cleaned_lines.append(line)
            # 写回文件
            file_path.write_text(
                "\n".join(cleaned_lines) + "\n" if cleaned_lines else "",
                encoding="utf-8",
            )
        except Exception:
            # 如果清理失败，忽略错误继续安装
            pass

    @classmethod
    async def install_requirement(cls, requirement_file: Path):
        """安装依赖文件

        参数:
            requirement_file: requirement文件路径

        异常:
            FileNotFoundError: 文件不存在
        """
        if not requirement_file.exists():
            raise FileNotFoundError(f"依赖文件 {requirement_file} 不存在", LOG_COMMAND)
        # 清理 requirements 文件中的非ASCII注释，防止 Windows GBK 编码问题
        cls._clean_requirements_file(requirement_file)
        try:
            command = cls.__get_command()
            command.append("install")
            command.append("-r")
            command.append(str(requirement_file.absolute()))
            logger.info(f"执行虚拟环境安装依赖文件指令: {command}", LOG_COMMAND)
            result = await asyncio.to_thread(
                subprocess.run,
                command,
                check=True,
                capture_output=True,
                text=True,
                encoding="utf-8",
                errors="replace",
            )
            logger.debug(
                f"安装虚拟环境依赖文件指令执行完成: {result.stdout}",
                LOG_COMMAND,
            )
            return result.stdout
        except (CalledProcessError, FileNotFoundError) as e:
            stderr = e.stderr if isinstance(e, CalledProcessError) else str(e)
            logger.error(
                f"安装虚拟环境依赖文件指令执行失败: {stderr}.",
                LOG_COMMAND,
            )
            return stderr

    @classmethod
    async def add_requirement(cls, requirement_file: Path):
        """兼容旧调用：安装 requirements 文件到当前虚拟环境。"""
        return await cls.install_requirement(requirement_file)

    @classmethod
    async def list(cls) -> str:
        """列出已安装的依赖包"""
        try:
            command = cls.__get_command()
            command.append("list")
            logger.info(f"执行虚拟环境列出包指令: {command}", LOG_COMMAND)
            result = await asyncio.to_thread(
                subprocess.run,
                command,
                check=True,
                capture_output=True,
                text=True,
                encoding="utf-8",
                errors="replace",
            )
            logger.debug(
                f"列出虚拟环境包指令执行完成: {result.stdout}",
                LOG_COMMAND,
            )
            return result.stdout
        except (CalledProcessError, FileNotFoundError) as e:
            stderr = e.stderr if isinstance(e, CalledProcessError) else str(e)
            logger.error(f"列出虚拟环境包指令执行失败: {stderr}.", LOG_COMMAND)
        return ""