Execute HP

Add Execute Under X HP to Secondary Weapon - Changes colour when ready
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// ==UserScript==
// @name         Execute HP
// @namespace    http://tampermonkey.net/
// @version      1.4.0
// @description  Add Execute Under X HP to Secondary Weapon - Changes colour when ready
// @author       Stig [2648238]
// @match        https://www.torn.com/page.php?sid=attack&user2ID=*
// @grant        GM_registerMenuCommand
// ==/UserScript==

(function () {
    'use strict';

    const STORAGE_KEY = 'executeHP_percent';
    const DEFAULT_PERCENT = 29;

    function readPercent() {
        const raw = parseFloat(localStorage.getItem(STORAGE_KEY));
        return Number.isFinite(raw) && raw > 0 && raw <= 100 ? raw : null;
    }

    function getPercent() {
        return readPercent() ?? DEFAULT_PERCENT;
    }

    function setPercent(value) {
        localStorage.setItem(STORAGE_KEY, String(value));
    }

    // Validate and store a user-entered value. Returns the parsed number, or
    // null if invalid (caller decides what to do).
    function commitPercent(input) {
        const v = parseFloat(input);
        if (!Number.isFinite(v) || v <= 0 || v > 100) return null;
        setPercent(v);
        return v;
    }

    // Prompt the user for a percentage. Used on first run and from the menu.
    // Returns true if a new value was saved.
    function promptForPercent() {
        const current = readPercent();
        const answer = window.prompt(
            'Execute HP — enter your execute % (1–100):',
            current !== null ? String(current) : String(DEFAULT_PERCENT)
        );
        if (answer === null) return false; // user cancelled
        const saved = commitPercent(answer.trim());
        if (saved === null) {
            window.alert('Invalid value — please enter a number between 1 and 100.');
            return false;
        }
        return true;
    }

    const ceilPct = (value, pct) => Math.ceil(value * (pct / 100));

    const sel = {
        opponentHeader: 'div[class*="headerWrapper"][class*="rose"]',
        healthIcon: '[class*="iconHealth"]',
        weaponSecond: '#weapon_second',
        weaponBottom: '[class*="bottom"]',
    };

    function getHealthSpan() {
        const header = document.querySelector(sel.opponentHeader);
        if (!header) return null;
        const entry = header.querySelector(sel.healthIcon)?.closest('[class*="entry"]');
        return entry?.querySelector('span') ?? null;
    }

    function getHealth() {
        const span = getHealthSpan();
        if (!span) return { current: 0, max: 0 };
        const [current, max] = span.textContent
            .split('/')
            .map((v) => parseInt(v.replace(/,/g, '').trim(), 10));
        return !isNaN(current) && !isNaN(max) ? { current, max } : { current: 0, max: 0 };
    }

    let injected = false;
    let labelEl = null; // ref so menu/prompt changes refresh the display

    function injectStyle() {
        if (document.getElementById('execute-hp-style')) return;
        const style = document.createElement('style');
        style.id = 'execute-hp-style';
        style.textContent = `
            .custom-execute-under {
                position: absolute;
                top: 70px;
                left: 24px;
                font-size: 10px;
                color: red;
                font-weight: normal;
            }
            .custom-execute-under.ready {
                color: #00FF00;
                font-weight: bold;
                left: 45px;
            }
        `;
        document.head.appendChild(style);
    }

    function tryInject() {
        if (injected) return true;

        const weaponSecond = document.querySelector(sel.weaponSecond);
        const targetDiv = weaponSecond?.querySelector(sel.weaponBottom);
        if (!targetDiv) return false;

        const { max } = getHealth();
        if (max === 0) return false; // health not loaded yet; wait for next mutation

        injectStyle();

        const newDiv = document.createElement('div');
        newDiv.className = 'custom-execute-under';
        targetDiv.parentNode.insertBefore(newDiv, targetDiv.nextSibling);
        labelEl = newDiv;

        recompute();

        // Observe the whole opponent header rather than the span itself:
        // Torn replaces the span node on each hit, which would detach an
        // observer bound directly to it.
        const header = document.querySelector(sel.opponentHeader);
        if (header) {
            new MutationObserver(recompute).observe(header, {
                childList: true,
                subtree: true,
                characterData: true,
            });
        }

        injected = true;
        return true;
    }

    function recompute() {
        if (!labelEl) return;
        const { current, max } = getHealth();
        const underHP = ceilPct(max, getPercent());
        if (current > 0 && current <= underHP) {
            labelEl.textContent = 'Execute Now!';
            labelEl.classList.add('ready');
        } else {
            labelEl.textContent = `Execute Under: ${underHP} HP`;
            labelEl.classList.remove('ready');
        }
    }

    // --- Tampermonkey menu command ---
    if (typeof GM_registerMenuCommand === 'function') {
        GM_registerMenuCommand('Set Execute %', () => {
            if (promptForPercent()) recompute();
        });
    }

    // --- First-run popup: only prompt if nothing valid is stored yet ---
    if (readPercent() === null) {
        promptForPercent(); // saves default if they accept/cancel into a valid state
    }

    if (!tryInject()) {
        const observer = new MutationObserver(() => {
            if (tryInject()) observer.disconnect();
        });
        observer.observe(document.body, { childList: true, subtree: true });
    }
})();