#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
文件选择器组件

提供文件/目录选择功能的组合组件。
"""

import tkinter as tk
from tkinter import filedialog, ttk
from typing import Optional, Callable


class FileSelector(ttk.Frame):
    """文件选择器组件"""

    def __init__(
        self,
        parent,
        label_text: str = "",
        file_type: str = "file",
        file_types: list = None,
        initial_dir: str = "",
        on_change: Optional[Callable] = None
    ):
        """
        初始化文件选择器

        Args:
            parent: 父容器
            label_text: 标签文本
            file_type: 选择类型 ('file' 或 'directory')
            file_types: 文件类型过滤器，如 [("Excel", "*.xlsx")]
            initial_dir: 初始目录
            on_change: 值改变时的回调函数
        """
        super().__init__(parent)

        self.file_type = file_type
        self.file_types = file_types or [("所有文件", "*.*")]
        self.initial_dir = initial_dir
        self.on_change = on_change

        # 创建标签
        if label_text:
            self.label = ttk.Label(self, text=label_text)
            self.label.grid(row=0, column=0, sticky="w", padx=(0, 5))

        # 创建输入框
        self.entry_var = tk.StringVar()
        self.entry = ttk.Entry(self, textvariable=self.entry_var, width=50)
        self.entry.grid(row=0, column=1, sticky="ew", padx=5)

        # 创建浏览按钮
        self.browse_button = ttk.Button(self, text="浏览...", command=self._browse)
        self.browse_button.grid(row=0, column=2, padx=5)

        # 配置列权重
        self.columnconfigure(1, weight=1)

    def _browse(self) -> None:
        """打开文件/目录选择对话框"""
        current_path = self.entry_var.get() or self.initial_dir

        if self.file_type == "file":
            path = filedialog.askopenfilename(
                title="选择文件",
                initialdir=current_path,
                filetypes=self.file_types
            )
        else:  # directory
            path = filedialog.askdirectory(
                title="选择目录",
                initialdir=current_path
            )

        if path:
            self.entry_var.set(path)
            if self.on_change:
                self.on_change(path)

    def get(self) -> str:
        """获取当前选择的路径"""
        return self.entry_var.get()

    def set(self, path: str) -> None:
        """设置路径"""
        self.entry_var.set(path)

    def clear(self) -> None:
        """清空路径"""
        self.entry_var.set("")

    def is_empty(self) -> bool:
        """检查是否为空"""
        return not self.entry_var.get()