// ==UserScript==
// @name         Amazon Keyword Modifier with Frequency Analysis
// @namespace    http://tampermonkey.net/
// @version      2.0
// @description  Add "+" to selected high-frequency keywords on Amazon pages
// @author       Your Name
// @match        https://www.amazon.com/*
// @grant        GM_setClipboard
// @downloadURL none
// ==/UserScript==

(function () {
    'use strict';

    // List of words to exclude
    const excludedWords = [
        "and", "or", "not", "but", "nor", "so", "yet", "for", "in", "on", "at", "by", "to",
        "of", "with", "about", "as", "from", "into", "over", "under", "after", "before",
        "around", "through", "between", "sets", "set", "pack", "pcs", "dozen", "pair", "unit",
        "kg", "g", "lb", "oz", "cm", "mm", "m", "km", "in", "ft", "ml", "l", "box", "bottle",
        "jar", "can", "tray"
    ];

    const excludedSymbols = /^[!@#$%^&*(),.?":{}|<>+=/\\~`;'\[\]-]+$/;

    // Create a floating button
    const button = document.createElement("div");
    button.textContent = "+";
    button.style.position = "fixed";
    button.style.bottom = "20px";
    button.style.left = "20px";
    button.style.width = "50px";
    button.style.height = "50px";
    button.style.borderRadius = "50%";
    button.style.backgroundColor = "#007bff";
    button.style.color = "white";
    button.style.fontSize = "24px";
    button.style.textAlign = "center";
    button.style.lineHeight = "50px";
    button.style.cursor = "pointer";
    button.style.boxShadow = "0 4px 8px rgba(0, 0, 0, 0.2)";
    document.body.appendChild(button);

    // Create a popup
    const popup = document.createElement("div");
    popup.style.position = "fixed";
    popup.style.bottom = "80px";
    popup.style.left = "20px";
    popup.style.width = "400px";
    popup.style.padding = "20px";
    popup.style.backgroundColor = "white";
    popup.style.border = "1px solid #ccc";
    popup.style.boxShadow = "0 4px 8px rgba(0, 0, 0, 0.2)";
    popup.style.display = "none";
    popup.style.zIndex = "1000";
    document.body.appendChild(popup);

    // Add input box for keywords
    const input = document.createElement("textarea");
    input.style.width = "100%";
    input.style.height = "80px";
    input.placeholder = "Enter keywords here (one per line)...";
    popup.appendChild(input);

    // Create a container for word frequency
    const frequencyContainer = document.createElement("div");
    frequencyContainer.style.marginTop = "10px";
    frequencyContainer.style.borderTop = "1px solid #ccc";
    frequencyContainer.style.paddingTop = "10px";
    popup.appendChild(frequencyContainer);

    // Add buttons
    const generateButton = document.createElement("button");
    generateButton.textContent = "Generate +";
    generateButton.style.marginTop = "10px";
    generateButton.style.marginRight = "10px";
    popup.appendChild(generateButton);

    const copyButton = document.createElement("button");
    copyButton.textContent = "Copy";
    copyButton.style.marginTop = "10px";
    popup.appendChild(copyButton);

    const output = document.createElement("textarea");
    output.style.width = "100%";
    output.style.height = "80px";
    output.style.marginTop = "10px";
    output.style.backgroundColor = "#f9f9f9";
    output.style.border = "1px solid #ccc";
    output.readOnly = true;
    popup.appendChild(output);

    // Show popup on button click
    button.addEventListener("click", () => {
        popup.style.display = popup.style.display === "none" ? "block" : "none";
    });

    // Analyze word frequency
    const analyzeFrequency = () => {
        frequencyContainer.innerHTML = ""; // Clear previous analysis
        const lines = input.value.split(/\n/).filter(line => line.trim() !== ""); // Split lines and remove empty ones
        const words = lines.flatMap(line => line.trim().split(/\s+/)); // Split words
        const wordCounts = {};

        // Count word occurrences
        words.forEach(word => {
            if (
                !excludedWords.includes(word.toLowerCase()) &&
                !excludedSymbols.test(word)
            ) {
                wordCounts[word] = (wordCounts[word] || 0) + 1;
            }
        });

        // Display frequency with checkboxes
        Object.entries(wordCounts)
            .sort((a, b) => b[1] - a[1]) // Sort by frequency
            .forEach(([word, count]) => {
                const label = document.createElement("label");
                const checkbox = document.createElement("input");
                checkbox.type = "checkbox";
                checkbox.value = word;
                label.appendChild(checkbox);
                label.appendChild(document.createTextNode(` ${word} (${count})`));
                frequencyContainer.appendChild(label);
                frequencyContainer.appendChild(document.createElement("br"));
            });
    };

    // Generate "+" keywords
    generateButton.addEventListener("click", () => {
        const checkedWords = Array.from(
            frequencyContainer.querySelectorAll("input:checked")
        ).map(checkbox => checkbox.value);

        const lines = input.value.split(/\n/).filter(line => line.trim() !== "");
        const processedLines = lines.map(line => {
            const words = line.trim().split(/\s+/);
            const processedWords = words.map(word => {
                if (checkedWords.includes(word)) {
                    return `+${word}`;
                } else {
                    return word;
                }
            });
            return processedWords.join(" ");
        });

        output.value = processedLines.join("\n");
        output.style.height = "auto";
        output.style.height = `${output.scrollHeight}px`;
    });

    // Copy to clipboard
    copyButton.addEventListener("click", () => {
        if (output.value.trim() !== "") {
            GM_setClipboard(output.value);
            alert("Copied to clipboard!");
        } else {
            alert("No content to copy!");
        }
    });

    // Update word frequency on input change
    input.addEventListener("input", analyzeFrequency);
})();