// ==UserScript==
// @name         关键词叠词生成器
// @namespace    http://tampermonkey.net/
// @version      1.1
// @description  输入关键词生成组合叠词
// @author       You
// @match        https://www.amazon.com/*
// @match        https://www.amazon.co.uk/*
// @grant        GM_addStyle
// @downloadURL none
// ==/UserScript==

(function () {
    'use strict';

    // 样式定义
    GM_addStyle(`
        #wordGeneratorContainer {
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            z-index: 9999;
            background-color: #f9f9f9;
            padding: 20px;
            border: 2px solid #ccc;
            border-radius: 15px;
            box-shadow: 0 8px 15px rgba(0, 0, 0, 0.2);
            display: none;
            font-family: Arial, sans-serif;
            width: auto;
            max-width: 500px;
            min-width: 300px;
        }
        #wordGeneratorContainer input, #wordGeneratorContainer button {
            margin: 5px;
            padding: 12px;
            font-size: 16px;
            border-radius: 8px;
            border: 1px solid #ccc;
            outline: none;
            width: 48%;
        }
        #wordGeneratorContainer button {
            cursor: pointer;
        }
        #outputArea {
            margin-top: 15px;
            padding: 15px;
            background-color: #f4f4f4;
            border: 1px solid #ddd;
            border-radius: 8px;
            min-height: 150px;
            overflow-y: auto;
        }
        #openGeneratorButton {
            position: fixed;
            bottom: 20px;
            right: 20px;
            background-color: #0073e6;
            color: white;
            padding: 15px;
            border: none;
            border-radius: 50%;
            cursor: pointer;
        }
        #closeButton {
            position: absolute;
            top: -10px;
            right: -10px;
            background-color: #ff3b3b;
            color: white;
            padding: 8px;
            border-radius: 50%;
            cursor: pointer;
        }
    `);

    // 动态创建UI
    const containerHTML = `
        <div id="wordGeneratorContainer">
            <button id="closeButton">×</button>
            <div>
                <input id="inputBox" type="text" placeholder="输入关键词 (用空格分隔)">
                <button id="generateButton">生成叠词</button>
                <button id="copyButton">复制</button>
                <button id="clearButton">清空</button>
            </div>
            <pre id="outputArea"></pre>
        </div>
        <button id="openGeneratorButton">叠</button>
    `;
    document.body.insertAdjacentHTML('beforeend', containerHTML);

    // 元素引用
    const container = document.getElementById('wordGeneratorContainer');
    const inputBox = document.getElementById('inputBox');
    const outputArea = document.getElementById('outputArea');
    const openButton = document.getElementById('openGeneratorButton');
    const closeButton = document.getElementById('closeButton');
    const generateButton = document.getElementById('generateButton');
    const copyButton = document.getElementById('copyButton');
    const clearButton = document.getElementById('clearButton');

    // 生成叠词逻辑
    function generateCombinations(input) {
        const words = input.trim().split(/\s+/);
        if (words.length < 2) return ['请输入至少两个关键词！'];

        const combinations = [];
        const repeat = (arr, times) =>
            Array(times)
                .fill(arr)
                .flat();
        const permute = (arr) => {
            if (arr.length === 1) return [arr];
            return arr.flatMap((word, i) =>
                permute(arr.filter((_, idx) => idx !== i)).map((perm) => [word, ...perm])
            );
        };

        combinations.push(...permute(words).map((perm) => repeat(perm, 2).join(' ')));

        return combinations;
    }

    // 事件监听
    generateButton.addEventListener('click', () => {
        const input = inputBox.value;
        outputArea.textContent = input
            ? generateCombinations(input).join('\n')
            : '请输入关键词！';
    });

    copyButton.addEventListener('click', () => {
        const text = outputArea.textContent.trim();
        if (text) {
            navigator.clipboard.writeText(text);
            alert('已复制到剪贴板！');
        } else {
            alert('没有可复制的内容！');
        }
    });

    clearButton.addEventListener('click', () => {
        inputBox.value = '';
        outputArea.textContent = '';
    });

    openButton.addEventListener('click', () => {
        container.style.display = 'block';
    });

    closeButton.addEventListener('click', () => {
        container.style.display = 'none';
    });
})();