#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
Production ID 输入控件

多行文本输入框，用于输入 Production ID 列表。
支持内容溢出时自动显示滚动条，左侧显示行号。
"""

import tkinter as tk
from tkinter import ttk, font
from tklinenums import TkLineNumbers


class ProductionIdInput(ttk.Frame):
    """Production ID 输入控件，带行号和自动滚动条"""

    def __init__(self, parent, placeholder="每行输入一个 Production ID", **kwargs):
        super().__init__(parent, **kwargs)
        self.placeholder = placeholder
        self._scrollbar_visible = False
        self._check_pending = False
        self._updating_placeholder = False

        # 创建文本框
        self.text_widget = tk.Text(self, wrap=tk.WORD, padx=5, pady=5)

        # 创建行号区域的容器
        self.linenums_frame = ttk.Frame(self)

        # 创建行号控件（使用黑色）
        self.line_numbers = TkLineNumbers(
            self.linenums_frame,
            self.text_widget,
            justify="center",
            colors=("black", "#f0f0f0"),
            bg="#f0f0f0",
            width=3
        )
        self.line_numbers.pack(fill="both", expand=True)

        # 创建滚动条
        self.scrollbar = ttk.Scrollbar(self, orient=tk.VERTICAL, command=self.text_widget.yview)
        self.text_widget.configure(yscrollcommand=self._on_scroll)

        # 布局：行号 | 文本框 | 滚动条
        self.linenums_frame.grid(row=0, column=0, sticky="ns")
        self.text_widget.grid(row=0, column=1, sticky="nsew")
        self.scrollbar.grid(row=0, column=2, sticky="ns")

        # 配置行列权重
        self.grid_rowconfigure(0, weight=1)
        self.grid_columnconfigure(1, weight=1)

        # 绑定事件
        self.text_widget.bind("<FocusIn>", self._on_focus_in)
        self.text_widget.bind("<FocusOut>", self._on_focus_out)
        # 监听内容变化事件
        self.text_widget.bind("<KeyRelease>", self._on_content_change)
        self.text_widget.bind("<ButtonRelease-1>", self._schedule_check)
        self.text_widget.bind("<ButtonRelease-3>", self._schedule_check)
        self.text_widget.bind("<Configure>", self._schedule_check)
        # 绑定粘贴事件
        self.text_widget.bind("<<Paste>>", self._schedule_check)

        # 初始隐藏滚动条（行号始终显示）
        self.scrollbar.grid_remove()

        # 显示占位符
        self._show_placeholder()

        # 延迟检查初始状态
        self.after(100, self._check_ui_state)

    def _on_focus_in(self, event):
        """获得焦点时隐藏占位符"""
        if not self._updating_placeholder and self.text_widget.get("1.0", "end-1c") == self.placeholder:
            self.text_widget.delete("1.0", tk.END)
            # 确保文字颜色为黑色
            self.text_widget.configure(foreground="black")

    def _on_focus_out(self, event):
        """失去焦点时显示占位符"""
        content = self.text_widget.get("1.0", "end-1c")
        if not content:
            self._show_placeholder()

    def _show_placeholder(self):
        """显示占位符"""
        self._updating_placeholder = True
        self.text_widget.delete("1.0", tk.END)
        self.text_widget.insert("1.0", self.placeholder)
        self.text_widget.configure(foreground="gray")
        self._updating_placeholder = False
        self._schedule_check()

    def _hide_placeholder(self):
        """隐藏占位符"""
        self._updating_placeholder = True
        if self.text_widget.get("1.0", "end-1c") == self.placeholder:
            self.text_widget.delete("1.0", tk.END)
            self.text_widget.configure(foreground="black")
        self._updating_placeholder = False

    def _on_content_change(self, event=None):
        """内容变化时的处理"""
        # 如果不是占位符状态，重绘行号
        if self.text_widget.get("1.0", "end-1c") != self.placeholder:
            self.line_numbers.redraw()
        self._schedule_check()

    def get(self) -> list[str]:
        """获取 Production ID 列表"""
        self._hide_placeholder()
        content = self.text_widget.get("1.0", "end-1c").strip()
        return [line.strip() for line in content.split("\n") if line.strip()]

    def set(self, production_ids: list[str]):
        """设置 Production ID 列表"""
        self._updating_placeholder = True
        self.text_widget.delete("1.0", tk.END)
        if production_ids:
            self.text_widget.insert("1.0", "\n".join(production_ids))
            self.text_widget.configure(foreground="black")
            self.after_idle(self.line_numbers.redraw)
        else:
            self._show_placeholder()
        self._updating_placeholder = False
        self._schedule_check()

    def clear(self):
        """清空内容"""
        self._updating_placeholder = True
        self.text_widget.delete("1.0", tk.END)
        self._show_placeholder()
        self._updating_placeholder = False
        self._schedule_check()

    def append(self, production_ids: list[str]):
        """追加 Production ID 列表"""
        self._hide_placeholder()
        if production_ids:
            current_content = self.text_widget.get("1.0", "end-1c")
            if current_content.strip():
                self.text_widget.insert(tk.END, "\n" + "\n".join(production_ids))
            else:
                self.text_widget.insert("1.0", "\n".join(production_ids))
            self.after_idle(self.line_numbers.redraw)
        self._schedule_check()

    def apply_font(self, font_family: str, font_size: int):
        """应用字体设置"""
        font_spec = font.Font(family=font_family, size=font_size)
        self.text_widget.configure(font=font_spec)
        # 重绘行号以应用字体变化
        self.after_idle(self.line_numbers.redraw)

    def _on_scroll(self, first, last):
        """滚动回调，更新滚动条位置和行号"""
        self.scrollbar.set(first, last)
        # 滚动时重绘行号以同步显示
        self.line_numbers.redraw()

    def _schedule_check(self, event=None):
        """调度 UI 状态检查（防抖）"""
        if not self._check_pending:
            self._check_pending = True
            self.after(50, self._check_ui_state)

    def _check_ui_state(self):
        """检查 UI 状态（滚动条）"""
        self._check_pending = False

        # 更新界面以确保获取准确的尺寸
        self.text_widget.update_idletasks()

        # 检查是否需要显示滚动条
        first, last = self.text_widget.yview()
        needs_scrollbar = last < 1.0

        if needs_scrollbar != self._scrollbar_visible:
            if needs_scrollbar:
                self.scrollbar.grid()
                self._scrollbar_visible = True
            else:
                self.scrollbar.grid_remove()
                self._scrollbar_visible = False