JavDB Film List Enhancer

Highlight JavDB movie cards by score and number of ratings.
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// ==UserScript==
// @name         JavDB Film List Enhancer
// @namespace    http://tampermonkey.net/
// @version      1.5.0
// @description  Highlight JavDB movie cards by score and number of ratings.
// @author       JHT
// @match        https://javdb.com/*
// @match        https://*.javdb.com/*
// @include      https://javdb*.com/*
// @grant        none
// @run-at       document-idle
// ==/UserScript==

(function () {
    'use strict';

    const PROCESSED_ATTR = 'data-jdb-rating-highlighted';
    const REVIEW_CAP = 100;
    const COLOR = [240, 0, 144];

    function clamp(value, min, max) {
        return Math.min(Math.max(value, min), max);
    }

    function calculateBackgroundColor(score, ratedBy) {
        const safeScore = clamp(Number(score) || 0, 0, 5);
        const safeRatedBy = Math.max(Number(ratedBy) || 0, 0);
        const scoreTransformed = Math.sqrt(safeScore / 5);
        const ratedByNormalized = clamp(safeRatedBy / REVIEW_CAP, 0, 1);
        const alpha = clamp(scoreTransformed * ratedByNormalized, 0, 1);

        return `rgba(${COLOR[0]}, ${COLOR[1]}, ${COLOR[2]}, ${alpha.toFixed(3)})`;
    }

    function parseRating(text) {
        const normalized = String(text || '')
            .replace(/\u00a0/g, ' ')
            .replace(/,/g, '')
            .replace(/\s+/g, ' ')
            .trim();

        const zhMatch = normalized.match(/([0-5](?:\.\d+)?)\s*分\s*,?\s*由\s*(\d+)\s*人\s*(?:評價|评价)/);
        if (zhMatch) {
            return {
                score: Number.parseFloat(zhMatch[1]),
                ratedBy: Number.parseInt(zhMatch[2], 10),
            };
        }

        const enMatch = normalized.match(/([0-5](?:\.\d+)?)\s*(?:\/\s*5)?\s*,?\s*(?:rated\s+by|by)\s*(\d+)\s*(?:people|users?|reviews?|ratings?)/i);
        if (enMatch) {
            return {
                score: Number.parseFloat(enMatch[1]),
                ratedBy: Number.parseInt(enMatch[2], 10),
            };
        }

        return null;
    }

    function findMovieCard(scoreElement) {
        const item = scoreElement.closest('.item');
        if (!item) return null;

        return (
            item.querySelector('a.box[href]') ||
            item.querySelector('a[href*="/v/"]') ||
            item.querySelector('a[href]')
        );
    }

    function highlightCard(card, rating) {
        const backgroundColor = calculateBackgroundColor(rating.score, rating.ratedBy);

        card.style.setProperty('background-color', backgroundColor, 'important');
        card.style.setProperty('box-shadow', `0 0 0 2px ${backgroundColor} inset`, 'important');
        card.dataset.jdbRatingScore = String(rating.score);
        card.dataset.jdbRatingCount = String(rating.ratedBy);
        card.setAttribute(PROCESSED_ATTR, '1');
    }

    function enhance(root = document) {
        const scope = root instanceof Element ? root : document;
        const scoreElements = scope.querySelectorAll('.movie-list .item .score .value, .item .score .value');

        scoreElements.forEach((scoreElement) => {
            const card = findMovieCard(scoreElement);
            if (!card || card.getAttribute(PROCESSED_ATTR) === '1') return;

            const rating = parseRating(scoreElement.textContent);
            if (!rating) return;

            highlightCard(card, rating);
        });
    }

    function scheduleEnhance() {
        window.clearTimeout(scheduleEnhance.timer);
        scheduleEnhance.timer = window.setTimeout(() => enhance(), 80);
    }

    enhance();

    const observer = new MutationObserver((mutations) => {
        for (const mutation of mutations) {
            if (mutation.type !== 'childList' || mutation.addedNodes.length === 0) continue;

            for (const node of mutation.addedNodes) {
                if (node.nodeType === Node.ELEMENT_NODE) {
                    scheduleEnhance();
                    return;
                }
            }
        }
    });

    observer.observe(document.documentElement, {
        childList: true,
        subtree: true,
    });
})();