import tkinter as tk
from tkinter import ttk, messagebox
import json
import os
import random


class App25:
    """フラッシュカードアプリ"""

    DEFAULT_CARDS = [
        {"q": "Pythonのリスト追加メソッドは？", "a": "append()"},
        {"q": "辞書のキー一覧を取得するメソッドは？", "a": "keys()"},
        {"q": "文字列を大文字に変換するメソッドは？", "a": "upper()"},
        {"q": "リストの要素数を返す組み込み関数は？", "a": "len()"},
        {"q": "ファイルを読み込むための関数は？", "a": "open()"},
    ]
    SAVE_FILE = "flashcards.json"

    def __init__(self, root):
        self.root = root
        self.root.title("フラッシュカードアプリ")
        self.root.geometry("500x440")
        self.root.configure(bg="#f8f9fc")
        self.cards = self._load_cards()
        self.current_idx = 0
        self.showing_answer = False
        self._build_ui()
        self._show_card()

    def _load_cards(self):
        if os.path.exists(self.SAVE_FILE):
            with open(self.SAVE_FILE, encoding="utf-8") as f:
                return json.load(f)
        return list(self.DEFAULT_CARDS)

    def _save_cards(self):
        with open(self.SAVE_FILE, "w", encoding="utf-8") as f:
            json.dump(self.cards, f, ensure_ascii=False, indent=2)

    def _build_ui(self):
        title_frame = tk.Frame(self.root, bg="#3776ab", pady=12)
        title_frame.pack(fill=tk.X)
        tk.Label(title_frame, text="フラッシュカード",
                 font=("Noto Sans JP", 16, "bold"),
                 bg="#3776ab", fg="white").pack()

        main_frame = tk.Frame(self.root, bg="#f8f9fc", padx=20, pady=12)
        main_frame.pack(fill=tk.BOTH, expand=True)

        # カード表示
        self.card_frame = tk.Frame(main_frame, bg="white", relief=tk.RAISED, bd=1)
        self.card_frame.pack(fill=tk.X, ipady=20)

        self.side_label = tk.Label(self.card_frame, text="問題",
                                   bg="white", fg="#3776ab", font=("Noto Sans JP", 10))
        self.side_label.pack(anchor="w", padx=14, pady=(10, 0))

        self.card_label = tk.Label(self.card_frame, text="",
                                   bg="white", font=("Noto Sans JP", 15),
                                   wraplength=420, justify="center")
        self.card_label.pack(expand=True, pady=10, padx=14)

        self.progress_label = tk.Label(main_frame, text="", bg="#f8f9fc",
                                       font=("Noto Sans JP", 10), fg="#888")
        self.progress_label.pack(anchor="e", pady=(4, 0))

        # ナビゲーション
        nav_frame = tk.Frame(main_frame, bg="#f8f9fc")
        nav_frame.pack(pady=8)
        ttk.Button(nav_frame, text="◀ 前", command=self.prev_card, width=8).pack(side=tk.LEFT, padx=4)
        ttk.Button(nav_frame, text="答えを見る", command=self.flip, width=12).pack(side=tk.LEFT, padx=4)
        ttk.Button(nav_frame, text="次 ▶", command=self.next_card, width=8).pack(side=tk.LEFT, padx=4)
        ttk.Button(nav_frame, text="シャッフル", command=self.shuffle, width=10).pack(side=tk.LEFT, padx=4)

        # カード追加
        add_frame = ttk.LabelFrame(main_frame, text="カードを追加", padding=8)
        add_frame.pack(fill=tk.X, pady=(4, 0))
        bg_color = self.root.cget("bg")
        row = tk.Frame(add_frame, bg=bg_color)
        row.pack(fill=tk.X)
        tk.Label(row, text="問:", bg=bg_color).pack(side=tk.LEFT)
        self.q_entry = ttk.Entry(row, width=20, font=("Noto Sans JP", 10))
        self.q_entry.pack(side=tk.LEFT, padx=4, fill=tk.X, expand=True)
        tk.Label(row, text="答:", bg=bg_color).pack(side=tk.LEFT)
        self.a_entry = ttk.Entry(row, width=16, font=("Noto Sans JP", 10))
        self.a_entry.pack(side=tk.LEFT, padx=4)
        ttk.Button(add_frame, text="追加", command=self.add_card).pack(anchor="e", pady=(4, 0))

    def _show_card(self):
        if not self.cards:
            self.card_label.config(text="カードがありません")
            self.progress_label.config(text="")
            return
        card = self.cards[self.current_idx]
        self.showing_answer = False
        self.side_label.config(text="問題", fg="#3776ab")
        self.card_label.config(text=card["q"], fg="#222")
        self.progress_label.config(
            text=f"{self.current_idx + 1} / {len(self.cards)}")

    def flip(self):
        if not self.cards:
            return
        card = self.cards[self.current_idx]
        self.showing_answer = not self.showing_answer
        if self.showing_answer:
            self.side_label.config(text="答え", fg="#27ae60")
            self.card_label.config(text=card["a"], fg="#27ae60")
        else:
            self.side_label.config(text="問題", fg="#3776ab")
            self.card_label.config(text=card["q"], fg="#222")

    def prev_card(self):
        if self.cards:
            self.current_idx = (self.current_idx - 1) % len(self.cards)
            self._show_card()

    def next_card(self):
        if self.cards:
            self.current_idx = (self.current_idx + 1) % len(self.cards)
            self._show_card()

    def shuffle(self):
        random.shuffle(self.cards)
        self.current_idx = 0
        self._show_card()

    def add_card(self):
        q = self.q_entry.get().strip()
        a = self.a_entry.get().strip()
        if not q or not a:
            messagebox.showwarning("警告", "問題と答えを両方入力してください")
            return
        self.cards.append({"q": q, "a": a})
        self._save_cards()
        self.q_entry.delete(0, tk.END)
        self.a_entry.delete(0, tk.END)
        self.current_idx = len(self.cards) - 1
        self._show_card()


if __name__ == "__main__":
    root = tk.Tk()
    app = App25(root)
    root.mainloop()