中音：1 2 3 4 5 6 7
低音：<1 <2 <3 <4 <5 <6 <7
高音：>1 >2 >3 >4 >5 >6 >7

# 音阶顺序（用于降半音查找）
basic_order = ['1', '2', '3', '4', '5', '6', '7']
low_order = ['<1', '<2', '<3', '<4', '<5', '<6', '<7']
high_order = ['>1', '>2', '>3', '>4', '>5', '>6', '>7']

# 映射表
basic_map = {'1': 'a', '2': 's', '3': 'd', '4': 'f', '5': 'g', '6': 'h', '7': 'j'}
low_map = {'<1': 'z', '<2': 'x', '<3': 'c', '<4': 'v', '<5': 'b', '<6': 'n', '<7': 'm'}
high_map = {'>1': 'q', '>2': 'w', '>3': 'e', '>4': 'r', '>5': 't', '>6': 'y', '>7': 'u'}

# 合并映射
all_map = {**basic_map, **low_map, **high_map}

# 降半音处理函数
def get_flat_note(note):
    if note.startswith('<'):
        order = low_order
    elif note.startswith('>'):
        order = high_order
    else:
        order = basic_order
    index = order.index(note)
    prev_index = (index - 1) % 7
    prev_note = order[prev_index]
    return all_map[prev_note].upper()

import tkinter as tk
from tkinter import filedialog, messagebox

# 音阶顺序
basic_order = ['1', '2', '3', '4', '5', '6', '7']
low_order = ['<1', '<2', '<3', '<4', '<5', '<6', '<7']
high_order = ['>1', '>2', '>3', '>4', '>5', '>6', '>7']

# 映射表
basic_map = {'1': 'a', '2': 's', '3': 'd', '4': 'f', '5': 'g', '6': 'h', '7': 'j'}
low_map = {'<1': 'z', '<2': 'x', '<3': 'c', '<4': 'v', '<5': 'b', '<6': 'n', '<7': 'm'}
high_map = {'>1': 'q', '>2': 'w', '>3': 'e', '>4': 'r', '>5': 't', '>6': 'y', '>7': 'u'}

all_map = {**basic_map, **low_map, **high_map}

def get_flat_note(note):
    if note.startswith('<'):
        order = low_order
    elif note.startswith('>'):
        order = high_order
    else:
        order = basic_order
    index = order.index(note)
    prev_index = (index - 1) % 7
    prev_note = order[prev_index]
    return all_map[prev_note].upper()

def convert_note(note):
    note = note.strip()
    if note.startswith('b'):
        base = note[1:]
        if base in all_map:
            return get_flat_note(base)
        else:
            return f"[无效:{note}]"
    else:
        return all_map.get(note, f"[无效:{note}]")

def convert():
    input_text = input_box.get("1.0", tk.END).strip()
    if not input_text:
        messagebox.showwarning("输入为空", "请输入简谱内容！")
        return
    notes = input_text.split()
    converted = " ".join(convert_note(n) for n in notes)
    output_box.delete("1.0", tk.END)
    output_box.insert(tk.END, converted)

def export_to_file():
    content = output_box.get("1.0", tk.END).strip()
    if not content:
        messagebox.showwarning("无内容", "没有可导出的内容！")
        return
    file_path = filedialog.asksaveasfilename(defaultextension=".txt",
                                             filetypes=[("文本文件", "*.txt")])
    if file_path:
        with open(file_path, "w", encoding="utf-8") as f:
            f.write(content)
        messagebox.showinfo("导出成功", f"已保存为：{file_path}")

# GUI
root = tk.Tk()
root.title("简谱换算器")
root.geometry("600x500")

tk.Label(root, text="输入简谱：").pack(anchor="w", padx=10)
input_box = tk.Text(root, height=8)
input_box.pack(fill="both", padx=10, pady=5)

tk.Label(root, text="输出结果：").pack(anchor="w", padx=10)
output_box = tk.Text(root, height=8)
output_box.pack(fill="both", padx=10, pady=5)

button_frame = tk.Frame(root)
button_frame.pack(pady=10)

tk.Button(button_frame, text="换算", width=10, command=convert).pack(side="left", padx=5)
tk.Button(button_frame, text="导出文本", width=10, command=export_to_file).pack(side="left", padx=5)
tk.Button(button_frame, text="清空", width=10, command=lambda: (input_box.delete("1.0", tk.END), output_box.delete("1.0", tk.END))).pack(side="left", padx=5)

root.mainloop()