import tkinter as tk
from tkinter import ttk, filedialog, messagebox
from fpdf import FPDF
from fpdf.enums import XPos, YPos  # 添加缺失的導入
from datetime import datetime
import platform
from pathlib import Path
import logging
from tkcalendar import DateEntry

# 日志配置
logging.basicConfig(filename='receipt.log', level=logging.INFO)


class AmountUtils:
    """金額處理工具類"""

    @staticmethod
    def to_chinese(num: float) -> str:
        """精確實現(xiàn)中文大寫金額轉(zhuǎn)換"""
        units = ['', '拾', '佰', '仟']
        big_units = ['', '萬', '億']
        digits = ('零', '壹', '貳', '叁', '肆', '伍', '陸', '柒', '捌', '玖')

        num = round(num, 2)
        integer_part = int(num)
        decimal_part = int(round(num - integer_part, 2) * 100)

        result = []

        # 處理整數(shù)部分
        if integer_part > 0:
            unit_index = 0
            while integer_part > 0:
                section = integer_part % 10000
                integer_part = integer_part // 10000
                section_str = ''

                for i in range(4):
                    digit = section % 10
                    section = section // 10
                    if digit != 0:
                        section_str = digits[digit] + units[i] + section_str
                    elif section_str and section_str[0] != '零':
                        section_str = '零' + section_str

                if section_str:
                    section_str += big_units[unit_index]
                result.append(section_str)
                unit_index += 1

            result = list(reversed(result))
            result_str = ''.join(result).replace('零零', '零').rstrip('零') + '元'
            result_str = result_str.replace('零零', '零')
            result = [result_str]
        else:
            result.append('零元')

        # 處理小數(shù)部分
        if decimal_part > 0:
            jiao = decimal_part // 10
            fen = decimal_part % 10

            if jiao > 0:
                result.append(digits[jiao] + '角')
            if fen > 0:
                result.append(digits[fen] + '分')
        else:
            result.append('整')

        return ''.join(result).replace('零元', '').replace('零零', '零')


class PDFGenerator:
    """嚴格按照圖片樣式的PDF生成器"""

    def __init__(self, font_config):
        self.font_config = font_config

    def generate(self, data: dict, save_path: str):
        """生成PDF文件"""
        pdf = FPDF()
        pdf.add_page()
        pdf.set_auto_page_break(auto=False)

        # 加載字體
        if self.font_config['path'] and Path(self.font_config['path']).exists():
            pdf.add_font(self.font_config['name'], fname=self.font_config['path'])
            pdf.set_font(self.font_config['name'], size=12)
        else:
            pdf.set_font("Arial", size=12)

        # 標題
        pdf.set_font_size(18)
        pdf.cell(0, 15, "收 款 收 據(jù)", align='C', new_x=XPos.LMARGIN, new_y=YPos.NEXT)

        # 交款方和日期
        pdf.set_font_size(12)
        pdf.cell(50, 10, f"交款方：{data['payer']}", new_x=XPos.LMARGIN)
        pdf.cell(0, 10, f"日期：{data['date']}", align='R', new_x=XPos.LMARGIN, new_y=YPos.NEXT)

        # 繪制表格
        self._draw_table(pdf, data)

        # 合計人民幣
        self._draw_total(pdf, data['total'])

        pdf.output(save_path)

    def _draw_table(self, pdf, data):
        """繪制與圖片完全一致的表格"""
        # 列寬（根據(jù)圖片比例精確計算）
        col_width = [40, 20, 20, 25, 30, 35]
        headers = ['項目', '單位', '數(shù)量', '單價', '金額', '備注']

        # 表頭
        pdf.set_xy(25, 45)
        pdf.set_fill_color(240, 240, 240)
        for i, header in enumerate(headers):
            pdf.cell(col_width[i], 10, header, border=1, fill=True, align='C')
        pdf.ln()

        # 表格內(nèi)容
        pdf.set_font_size(12)
        y_position = 55
        for item in data['items']:
            if y_position > 250:  # 處理分頁
                pdf.add_page()
                y_position = 45
                self._draw_table_header(pdf)
                y_position = 55

            pdf.set_xy(25, y_position)
            # 項目列左對齊，其他列居中/右對齊
            alignments = ['L', 'C', 'R', 'R', 'R', 'L']
            values = [
                item['name'],
                item['unit'],
                f"{item['quantity']:.2f}",
                f"￥{item['price']:.2f}",
                f"￥{item['quantity'] * item['price']:.2f}",
                item['remark']
            ]

            for i in range(6):
                pdf.cell(col_width[i], 10, values[i], border=1, align=alignments[i])

            y_position += 10

    def _draw_table_header(self, pdf):
        """繪制表頭（分頁時使用）"""
        col_width = [40, 20, 20, 25, 30, 35]
        headers = ['項目', '單位', '數(shù)量', '單價', '金額', '備注']
        pdf.set_xy(25, 45)
        pdf.set_fill_color(240, 240, 240)
        for i, header in enumerate(headers):
            pdf.cell(col_width[i], 10, header, border=1, fill=True, align='C')
        pdf.ln()

    def _draw_total(self, pdf, total):
        """繪制合計行（精確復制圖片樣式）"""
        pdf.set_xy(25, 105)
        # 第一行
        pdf.cell(100, 10, "合計人民幣", border=1)
        pdf.cell(45, 10, f"￥{total:.2f}", border=1, align='R')
        pdf.cell(35, 10, "", border=1)  # 備注列

        # 第二行
        pdf.set_xy(25, 115)
        pdf.cell(100, 10, "", border=1)
        pdf.cell(80, 10, f"（大寫）{AmountUtils.to_chinese(total)}", border=1, align='L')


class ReceiptSystem:
    """主界面系統(tǒng)"""

    def __init__(self):
        self.root = tk.Tk()
        self.root.title("智能收據(jù)系統(tǒng)")
        self.root.geometry("800x600")

        self.font_config = self._get_font_config()
        self.items = []
        self.total = 0.0

        self._create_ui()
        self.reset()  # 初始化表單數(shù)據(jù)

    def _get_font_config(self):
        """獲取系統(tǒng)字體配置"""
        system = platform.system()
        font_config = {'name': 'Arial', 'path': None}

        if system == 'Windows':
            font_path = 'C:/Windows/Fonts/simhei.ttf'
            if Path(font_path).exists():
                font_config.update(name='SimHei', path=font_path)
        elif system == 'Linux':
            font_path = '/usr/share/fonts/truetype/wqy/wqy-zenhei.ttc'
            if Path(font_path).exists():
                font_config.update(name='WenQuanYi Zen Hei', path=font_path)
        elif system == 'Darwin':
            font_path = '/System/Library/Fonts/STHeiti Light.ttc'
            if Path(font_path).exists():
                font_config.update(name='STHeiti', path=font_path)

        return font_config

    def _create_ui(self):
        """創(chuàng)建與圖片一致的UI布局"""
        main_frame = ttk.Frame(self.root)
        main_frame.pack(fill=tk.BOTH, expand=True, padx=20, pady=20)

        # 標題
        ttk.Label(main_frame, text="收 款 收 據(jù)", font=('', 16, 'bold')).pack(pady=10)

        # 交款方和日期
        info_frame = ttk.Frame(main_frame)
        info_frame.pack(fill=tk.X, pady=10)

        ttk.Label(info_frame, text="交款方：").grid(row=0, column=0, sticky='e')
        self.payer_entry = ttk.Entry(info_frame, width=25)
        self.payer_entry.grid(row=0, column=1, padx=5, sticky='ew')

        ttk.Label(info_frame, text="日期：").grid(row=0, column=2, padx=10)
        self.date_entry = DateEntry(info_frame,
                                    locale='zh_CN',
                                    date_pattern='yyyy-MM-dd',
                                    width=12)
        self.date_entry.grid(row=0, column=3, padx=5, sticky='ew')

        info_frame.columnconfigure(1, weight=1)
        info_frame.columnconfigure(3, weight=1)

        # 表格（精確列寬）
        self.tree = ttk.Treeview(main_frame,
                                 columns=('項目', '單位', '數(shù)量', '單價', '金額', '備注'),
                                 show='headings',
                                 height=5)

        # 嚴格按照圖片比例設置列寬
        columns = [
            ('項目', 160), ('單位', 80),
            ('數(shù)量', 80), ('單價', 100),
            ('金額', 100), ('備注', 100)
        ]
        for col, width in columns:
            self.tree.heading(col, text=col)
            self.tree.column(col, width=width, anchor='center')

        self.tree.pack(fill=tk.BOTH, expand=True, pady=10)

        # 操作按鈕
        btn_frame = ttk.Frame(main_frame)
        btn_frame.pack(pady=10)
        ttk.Button(btn_frame, text="添加明細", command=self.add_item).grid(row=0, column=0, padx=5)
        ttk.Button(btn_frame, text="生成收據(jù)", command=self.generate_pdf).grid(row=0, column=1, padx=5)
        ttk.Button(btn_frame, text="重置", command=self.reset).grid(row=0, column=2, padx=5)

    def add_item(self):
        """添加明細（包含備注字段）"""
        if len(self.items) >= 5:
            messagebox.showwarning("提示", "最多只能添加5條明細")
            return

        input_win = tk.Toplevel(self.root)
        input_win.title("輸入明細")

        fields = [
            ('項目', 0), ('單位', 1),
            ('數(shù)量', 2), ('單價', 3),
            ('備注', 4)
        ]

        entries = {}
        for idx, (label, row) in enumerate(fields):
            ttk.Label(input_win, text=f"{label}：").grid(row=row, column=0, padx=5, pady=5)
            entry = ttk.Entry(input_win)
            entry.grid(row=row, column=1, padx=5, pady=5)
            entries[label] = entry

        ttk.Button(input_win, text="確認",
                   command=lambda: self._validate_entry(entries, input_win)).grid(row=5, columnspan=2)

    def _validate_entry(self, entries, window):
        """驗證輸入"""
        try:
            data = {
                'name': entries['項目'].get().strip(),
                'unit': entries['單位'].get().strip(),
                'quantity': float(entries['數(shù)量'].get()),
                'price': float(entries['單價'].get()),
                'remark': entries['備注'].get().strip()
            }

            if not data['name'] or not data['unit']:
                raise ValueError("項目和單位必須填寫")
            if data['quantity'] <= 0 or data['price'] <= 0:
                raise ValueError("數(shù)量和單價必須大于零")

            # 更新表格
            amount = data['quantity'] * data['price']
            self.tree.insert('', 'end', values=(
                data['name'],
                data['unit'],
                f"{data['quantity']:.2f}",
                f"￥{data['price']:.2f}",
                f"￥{amount:.2f}",
                data['remark']
            ))
            self.items.append(data)
            self.total += amount
            window.destroy()

        except Exception as e:
            messagebox.showerror("輸入錯誤", str(e))

    def generate_pdf(self):
        """生成PDF"""
        try:
            if not self.items:
                raise ValueError("請先添加明細項目")
            if not self.payer_entry.get().strip():
                raise ValueError("交款方不能為空")

            data = {
                'payer': self.payer_entry.get(),
                'date': self.date_entry.get(),
                'items': self.items,
                'total': self.total
            }

            save_path = filedialog.asksaveasfilename(
                defaultextension=".pdf",
                filetypes=[("PDF文件", "*.pdf")]
            )

            if save_path:
                # 確保目錄存在
                path = Path(save_path)
                path.parent.mkdir(parents=True, exist_ok=True)

                PDFGenerator(self.font_config).generate(data, save_path)
                messagebox.showinfo("成功", f"文件已保存至：{save_path}")
                self.root.update()

        except Exception as e:
            messagebox.showerror("生成錯誤", str(e))
            logging.error(f"生成錯誤: {str(e)}")

    def reset(self):
        """重置表單"""
        self.items = []
        self.total = 0.0
        self.tree.delete(*self.tree.get_children())
        self.payer_entry.delete(0, tk.END)
        self.date_entry.set_date(datetime.now())


if __name__ == "__main__":
    app = ReceiptSystem()
    app.root.mainloop()