// ==UserScript==
// @name         Pinterest Ultra Assistant V6.3 (Pro Color Engine)
// @namespace    http://tampermonkey.net/
// @version      6.3
// @description  Bilingual UI, AI 2x Sharpen, Source Finder, and SMART Color Palette (Filters out background grays).
// @author       Pi Xiao
// @match        https://*.pinterest.com/*
// @grant        GM_openInTab
// @grant        GM_setClipboard
// @license      MIT
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    const BRIDGE_PAGE = "https://meishubiji.cn/ai-processing-center/";

    // --- 算法：颜色差异度计算 ---
    function getColorDist(hex1, hex2) {
        const r1 = parseInt(hex1.slice(1,3), 16), g1 = parseInt(hex1.slice(3,5), 16), b1 = parseInt(hex1.slice(5,7), 16);
        const r2 = parseInt(hex2.slice(1,3), 16), g2 = parseInt(hex2.slice(3,5), 16), b2 = parseInt(hex2.slice(5,7), 16);
        return Math.sqrt((r1-r2)**2 + (g1-g2)**2 + (b1-b2)**2);
    }

    function rgbToHex(r, g, b) {
        return "#" + ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1).toUpperCase();
    }

    // --- 核心：智能提取鲜艳色盘 ---
    function getSmartPalette(img) {
        const canvas = document.createElement('canvas');
        const ctx = canvas.getContext('2d');
        canvas.width = 50; canvas.height = 50; // 小尺寸采样提速并去噪
        ctx.drawImage(img, 0, 0, 50, 50);
        
        const data = ctx.getImageData(0, 0, 50, 50).data;
        let colorMap = {};
        
        for (let i = 0; i < data.length; i += 4) {
            const r = data[i], g = data[i+1], b = data[i+2], a = data[i+3];
            if (a < 128) continue; // 忽略透明像素
            
            const hex = rgbToHex(r, g, b);
            // 计算饱和度：值越大说明颜色越鲜艳
            const saturation = Math.max(r, g, b) - Math.min(r, g, b);
            // 权重公式：基础频率 + 饱和度奖励
            colorMap[hex] = (colorMap[hex] || 0) + (1 + saturation / 20);
        }

        // 排序并过滤掉过于接近的颜色
        const sortedColors = Object.keys(colorMap).sort((a, b) => colorMap[b] - colorMap[a]);
        const finalPalette = [];
        
        for (const color of sortedColors) {
            if (finalPalette.length >= 6) break;
            // 如果这个颜色和已选颜色差异足够大（距离 > 40），才入选
            if (finalPalette.every(c => getColorDist(c, color) > 40)) {
                finalPalette.push(color);
            }
        }
        return finalPalette;
    }

    // --- 智能预览窗 ---
    async function processAndShow(imgUrl) {
        const originalUrl = imgUrl.replace(/\/(236x|474x|564x|736x|1200x)\//, '/originals/').replace(/\.webp$/, '.jpg');
        const overlay = document.createElement('div');
        overlay.id = "px-overlay";
        overlay.style = "position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.96);z-index:2147483647;display:flex;flex-direction:column;align-items:center;justify-content:center;color:white;font-family:sans-serif;cursor:zoom-out;";
        overlay.innerHTML = '<div style="text-align:center;"><div class="px-spinner"></div><div style="margin-top:15px; font-size:14px; color:#00ffcc; letter-spacing:1px;">EXTRACTING SMART PALETTE...</div></div><style>.px-spinner { width:30px; height:30px; border:2px solid rgba(0,255,204,0.1); border-top-color:#00ffcc; border-radius:50%; animation:spin .8s linear infinite; margin:0 auto; } @keyframes spin { to { transform:rotate(360deg); } } .px-color:hover { transform: scale(1.2); border-color: #fff !important; }</style>';
        overlay.onclick = () => overlay.remove();
        document.body.appendChild(overlay);

        const img = new Image();
        img.crossOrigin = "Anonymous";
        img.src = originalUrl;
        
        img.onload = function() {
            const palette = getSmartPalette(img);
            overlay.innerHTML = "";
            const container = document.createElement('div');
            container.style = "text-align:center; width:95%; height:90vh; display:flex; flex-direction:column; cursor:default;";
            container.onclick = (e) => e.stopPropagation();
            
            const scrollBox = document.createElement('div');
            scrollBox.style = "overflow:auto; border:1px solid #333; border-radius:12px; flex:1; background:#050505; display:flex; align-items:center; justify-content:center;";
            const pImg = document.createElement('img');
            pImg.src = originalUrl;
            pImg.style = "max-width:200%; image-rendering:-webkit-optimize-contrast; filter:contrast(1.05);";
            scrollBox.appendChild(pImg);

            const bar = document.createElement('div');
            bar.style = "padding:25px; display:flex; flex-direction:column; align-items:center; gap:20px; background:#111; border-top: 1px solid #222;";
            
            // 色盘生成
            let paletteHTML = `<div style="display:flex; gap:12px; align-items:center;">
                <span style="font-size:11px; color:#555; text-transform:uppercase; letter-spacing:1px;">Accents:</span>`;
            palette.forEach(color => {
                paletteHTML += `<div class="px-color" style="width:28px; height:28px; background:${color}; border-radius:6px; cursor:pointer; border:2px solid #222; transition:0.2s;" title="Copy Hex: ${color}" data-hex="${color}"></div>`;
            });
            paletteHTML += `</div>`;
            
            const actionHTML = `
                <div style="display:flex; gap:20px; align-items:center;">
                    <button id="btn-ai-go" style="background:linear-gradient(135deg, #6a11cb 0%, #2575fc 100%); color:white; border:none; padding:14px 40px; border-radius:50px; font-size:15px; font-weight:bold; cursor:pointer; box-shadow:0 10px 30px rgba(37,117,252,0.3); transition:0.3s;">🚀 LAUNCH AI 8K ENGINE</button>
                    <span style="color:#444; cursor:pointer; font-size:12px;" onclick="document.getElementById('px-overlay').remove()">Close Preview ×</span>
                </div>
            `;

            bar.innerHTML = paletteHTML + actionHTML;
            container.appendChild(scrollBox);
            container.appendChild(bar);
            overlay.appendChild(container);

            overlay.querySelectorAll('.px-color').forEach(el => {
                el.onclick = () => {
                    const hex = el.getAttribute('data-hex');
                    GM_setClipboard(hex);
                    el.style.borderColor = "#fff";
                    setTimeout(() => el.style.borderColor = "#222", 500);
                };
            });
            overlay.querySelector('#btn-ai-go').onclick = () => window.open(`${BRIDGE_PAGE}?url=${encodeURIComponent(originalUrl)}`, '_blank');
        };
        img.onerror = () => { window.open(originalUrl, '_blank'); overlay.remove(); };
    }

    // --- 注入逻辑 ---
    function injectButtons() {
        const images = document.querySelectorAll('img');
        images.forEach(img => {
            const src = img.src;
            if (!src || !src.includes('pinimg.com') || img.width < 150 || img.closest('.px-helper-bar')) return;
            const container = img.closest('[data-test-id="pin-visual-wrapper"]') || img.closest('[data-test-id="visual-content-container"]') || img.parentElement;
            if (container) {
                if (window.getComputedStyle(container).position === 'static') container.style.position = 'relative';
                const bar = document.createElement('div');
                bar.className = 'px-helper-bar';
                bar.style = "position:absolute; top:10px; left:10px; z-index:1000; display:flex; gap:4px; opacity:0; transition:0.3s; pointer-events:auto;";
                container.addEventListener('mouseenter', () => bar.style.opacity = "1");
                container.addEventListener('mouseleave', () => bar.style.opacity = "0");
                const btnStyle = 'color:white; border:none; border-radius:4px; cursor:pointer; padding:4px 8px; font-weight:bold; font-size:9px; box-shadow:0 2px 5px rgba(0,0,0,0.3); white-space:nowrap;';
                const b1 = document.createElement('button'); b1.innerHTML = '🪄 2x HD'; b1.style = btnStyle + 'background:#00BFFF;';
                b1.onclick = (e) => { e.preventDefault(); e.stopPropagation(); processAndShow(src); };
                const b2 = document.createElement('button'); b2.innerHTML = '🖼️ Originals'; b2.style = btnStyle + 'background:#E60023;';
                b2.onclick = (e) => { e.preventDefault(); e.stopPropagation(); window.open(src.replace(/\/(236x|474x|564x|736x)\//, '/originals/'), '_blank'); };
                const b3 = document.createElement('button'); b3.innerHTML = '🔍 Source'; b3.style = btnStyle + 'background:#34a853;';
                b3.onclick = (e) => { e.preventDefault(); e.stopPropagation(); window.open(`https://lens.google.com/uploadbyurl?url=${encodeURIComponent(src.replace(/\/(236x|474x|564x|736x)\//, '/originals/'))}`, '_blank'); };
                bar.appendChild(b1); bar.appendChild(b2); bar.appendChild(b3);
                container.appendChild(bar);
            }
        });
    }

    setInterval(injectButtons, 2500);
    const observer = new MutationObserver(injectButtons);
    observer.observe(document.body, { childList: true, subtree: true });
})();