import tkinter as tk
from tkinter import messagebox
import re
from math import *

# 创建主窗口
window = tk.Tk()
# 设置窗口大小和位置
window.geometry('520x300+600+300')
# 不允许改变窗口大小
window.resizable(False, False)
# 设置窗口标题
window.title('计算器')
# 背景颜色,例：window.config(background="BlueViolet")
window.config(background="Blue")
# 自动刷新字符串变量，可用 set 和 get 方法进行传值和取值
content_var = tk.StringVar(window, '')
# 创建单行文本框
content_entry = tk.Entry(window, textvariable=content_var, bd=10)
# 设置文本框为只读
content_entry['state'] = 'readonly'
# 设置文本框坐标及宽高
content_entry.place(x=20, y=10, width=300, height=38)
# 记录计算过程
record_text = tk.Text(window, wrap=tk.WORD, height=10)
record_text.place(x=320, y=50, width=180, height=240)

# 按钮显示内容
values = ['eˣ', 'π', '**', '%', '//', 'ln',
          '√', '⌫', '(', ')', '/', 'lg',
          'x!', '7', '8', '9', '*', 'tan',
          'x³', '4', '5', '6', '-', 'cos',
          'x²', '1', '2', '3', '+', 'sin']

# 其余特殊按钮
value = ['+/-', 'C', '0', '.', '=']

index_s = 0
index = 0
# 将按钮进行 5x6 放置
for row in range(5):
    for col in range(6):
        d = values[index_s]
        index_s += 1
        if row == 1:
            if col == 1 or col == 2 or col == 3:
                btn_digit = tk.Button(window, text=d, font=("Helvetica", 14, "bold"),
                                      command=lambda x=d: onclick(x), bg="gray", fg="black")
                btn_digit.place(x=20 + col * 50, y=50 + row * 40, width=50, height=40)
            elif col == 0 or col == 4:
                btn_digit = tk.Button(window, text=d, font=("Helvetica", 14, "bold"),
                                      command=lambda x=d: onclick(x), bg="DeepSkyBlue", fg="purple")
                btn_digit.place(x=20 + col * 50, y=50 + row * 40, width=50, height=40)
            else:
                btn_digit = tk.Button(window, text=d, font=("Helvetica", 14, "bold"),
                                      command=lambda x=d: onclick(x), bg="orange", fg="blue")
                btn_digit.place(x=20 + col * 50, y=50 + row * 40, width=50, height=40)
                
        elif row == 2 or row == 3 or row == 4:
            if col == 1 or col == 2 or col == 3:
                btn_digit = tk.Button(window, text=d, font=("Helvetica", 14, "bold"),
                                      command=lambda x=d: onclick(x), bg="LightPink", fg="red")
                btn_digit.place(x=20 + col * 50, y=50 + row * 40, width=50, height=40)
            elif col == 0 or col == 4:
                btn_digit = tk.Button(window, text=d, font=("Helvetica", 14, "bold"),
                                      command=lambda x=d: onclick(x), bg="DeepSkyBlue", fg="purple")
                btn_digit.place(x=20 + col * 50, y=50 + row * 40, width=50, height=40)
            else:
                btn_digit = tk.Button(window, text=d, font=("Helvetica", 14, "bold"),
                                      command=lambda x=d: onclick(x), bg="orange", fg="blue")
                btn_digit.place(x=20 + col * 50, y=50 + row * 40, width=50, height=40)
                
        elif col == 5:
            btn_digit = tk.Button(window, text=d, font=("Helvetica", 14, "bold"),
                                  command=lambda x=d: onclick(x), bg="orange", fg="blue")
            btn_digit.place(x=20 + col * 50, y=50 + row * 40, width=50, height=40)
            
        else:
            btn_digit = tk.Button(window, text=d, font=("Helvetica", 14, "bold"),
                                  command=lambda x=d: onclick(x), bg="DeepSkyBlue", fg="purple")
            btn_digit.place(x=20 + col * 50, y=50 + row * 40, width=50, height=40)

for leo in range(5):
    c = value[index]
    index += 1
    if leo == 2:
        btn_digit = tk.Button(window, text=c, font=("Helvetica", 14, "bold"),
                              command=lambda x=c: onclick(x), bg="LightPink", fg="red")
        btn_digit.place(x=20 + leo * 50, y=250, width=50, height=40)
        
    elif leo == 0:
        btn_digit = tk.Button(window, text=c, font=("Helvetica", 14, "bold"),
                              command=lambda x=c: onclick(x), bg="SpringGreen", fg="red")
        btn_digit.place(x=20 + leo * 50, y=250, width=50, height=40)
        
    elif leo == 1:
        btn_digit = tk.Button(window, text=c, font=("Helvetica", 14, "bold"),
                              command=lambda x=c: onclick(x), bg="yellow", fg="red")
        btn_digit.place(x=20 + leo * 50, y=250, width=50, height=40)
        
    elif leo == 3:
        btn_digit = tk.Button(window, text=c, font=("Helvetica", 14, "bold"),
                              command=lambda x=c: onclick(x), bg="SkyBlue", fg="red")
        btn_digit.place(x=20 + leo * 50, y=250, width=50, height=40)
        
    else:
        btn_digit = tk.Button(window, text=c, font=("Helvetica", 14, "bold"),
                              command=lambda x=c: onclick(x), bg="LightCoral", fg="black")
        btn_digit.place(x=220, y=250, width=100, height=40)

lab_text_record = tk.Label(window, text='历史记录', font=("Helvetica", 14, "bold"), bg="white", fg="black")
lab_text_record.place(x=320, y=10, width=180, height=40)

# 添加清除历史记录按钮
btn_clear_record = tk.Button(window, text='清除记录', font=("Helvetica", 14, "bold"),
                             command=lambda: record_text.delete(1.0, tk.END), bg="white", fg="black")
btn_clear_record.place(x=320, y=250, width=180, height=40)


# 点击事件
def onclick(key):
    # 运算符
    operation = ('+', '-', '*', '/', '**', '//', '%')
    # 获取文本框中的内容
    content = content_var.get()
    # 如果已有内容是以小数点开头的，在前面加 0
    if content.startswith('.'):
        content = '0' + content  # 字符串可以直接用+来增加字符
    # 根据不同的按钮作出不同的反应
    if key in '0123456789':
        # 按下 0-9 在 content 中追加
        content += key
    
    elif key == '.':
        # 将 content 从 +-*/ 这些字符的地方分割开来
        last_part = re.split(r'[+\-*/]', content)[-1]
        if '.' in last_part:
            # 信息提示对话框
            tk.messagebox.showerror('错误', '数字只有一个小数点，所以不能再次点击！')
            return
        else:
            content += key
            
    elif key == 'C':
        # 清除文本框
        content = ''
        
    elif key == '=':
        try:
            # 对输入的表达式求值
            result = str(eval(content.replace("π", str(pi)).replace("rad", "radians")))
            record_text.insert(tk.END, f"{content} = {result}\n")
            content = result
        except ZeroDivisionError:
            tk.messagebox.showerror('错误', '这个值太大了，以至于无法算出其值，0不能作为除数！')
            return
        except Exception as e:
            tk.messagebox.showerror('错误', f'无效表达式: {e}')
            return
        
    elif key in operation:
        if content.endswith(operation):
            tk.messagebox.showerror('错误', '运算符号之间不能直接连接，需要加入数值！')
            return
        content += key

    elif key == '+/-':
        # 将正负号切换
        if content.startswith('-'):
            content = content[1:]
        else:
            content = '-' + content
            
    elif key in '()':
        # 直接在内容后面追加括号
        content += key
        
    elif key == '√':
        # 从 . 处分割存入 n，n 是一个列表
        n = content.split('.')
        # 如果列表中所有的都是数字，就是为了检查表达式是不是正确的
        if all(map(lambda x: x.isdigit(), n)):
            content = sqrt(eval(content))
        else:
            tk.messagebox.showerror('错误', '在实数范围内，负数不能算数平方根！')
            return
        
    elif key == 'eˣ':
        # 添加常数e的x次方,content = exp(eval(content))
        content += 'e**'
        
    elif key == '⌫':
        # 删除最后一个字符
        content = content[:-1]
        
    elif key == 'x²':
        # 计算平方
        try:
            content = str(float(content) ** 2)
        except Exception as e:
            tk.messagebox.showerror('错误', f'无效表达式: {e}')
            return
        
    elif key == 'x³':
        # 计算立方
        try:
            content = str(float(content) ** 3)
        except Exception as e:
            tk.messagebox.showerror('错误', f'无效表达式: {e}')
            return
        
    elif key == 'x!':
        # 计算阶乘
        try:
            num = int(content)
            if num < 0:
                tk.messagebox.showerror('错误', '请输入一个非负整数进行阶乘运算！')
                return
            content = str(factorial(num))
        except ValueError:
            tk.messagebox.showerror('错误', '请输入一个非负整数进行阶乘运算！')
            return
        except Exception as e:
            tk.messagebox.showerror('错误', f'无效的表达式: {e}')
            return
        
    elif key == 'π':
        # 添加常数π
        content += 'π'
        
    elif key == 'sin':
        # 计算sin值,content = sin(eval(content))
        content += 'sin('
        
    elif key == 'cos':
        # 计算cos值,content = cos(eval(content))
        content += 'cos('
        
    elif key == 'tan':
        # 计算tan值,content = tan(eval(content))
        content += 'tan('
        
    elif key == 'lg':
        # 计算常数对数lg的值,content = log10(eval(content))
        content += 'log10('
        
    elif key == 'ln':
        # 计算自然对数ln的值,content = log(eval(content))
        content += 'log('
        
    elif key == 'rad':
        # 当输入数字到三角函数运算时，默认为弧度制。
        content = str(eval(content)) + ' rad'

    # 将结果显示到文本框中
    content_var.set(content)


# 运行主循环

window.mainloop()

# 2 + 9 * ((3*12) - 8) // 10 = 27
# 3 * 4 ** 2 // 8 % 7 = 6
# 3 + 5 % 6 * 2 // 8 = 4