// ==UserScript==
// @name         Medium Member Bypass
// @author       UniverseDev
// @license      GPL-3.0-or-later
// @namespace    http://tampermonkey.net/
// @version      13.9.2
// @description  Modern Medium GUI with multiple bypass services and fallback with availability checks, including custom domains and Freedium banner auto-close.
// @match        *://*.medium.com/*
// @match        *://*.betterprogramming.pub/*
// @match        *://*.towardsdatascience.com/*
// @match        https://freedium.cfd/*
// @match        https://readmedium.com/*
// @match        https://md.vern.cc/*
// @match        https://archive.is/*
// @match        https://archive.li/*
// @match        https://archive.vn/*
// @match        https://archive.ph/*
// @grant        GM_registerMenuCommand
// @grant        GM_setValue
// @grant        GM_getValue
// @connect      freedium.cfd
// @connect      readmedium.com
// @connect      md.vern.cc
// @connect      archive.is
// @connect      archive.li
// @connect      archive.vn
// @connect      archive.ph
// @downloadURL none
// ==/UserScript==

(() => {
    'use strict';

    const CLASS_SETTINGS = 'medium-settings';
    const CLASS_NOTIFICATION = 'medium-notification';
    const SELECTOR_MEMBER_DIV = 'p.bf.b.bg.z.bk';
    const SELECTOR_FREEDIUM_CLOSE_BUTTON = '.close-button';
    const SELECTOR_MEMBER_WALL_CHECK = 'div.s.u.w.fg.fh.q';

    const getSetting = (key, defaultValue) => GM_getValue(key, defaultValue);
    const setSetting = (key, value) => GM_setValue(key, value);

    const medium_custom_domains = ['betterprogramming.pub', 'towardsdatascience.com'];

    const config = {
        bypassUrls: {
            freedium: 'https://freedium.cfd',
            readmedium: 'https://readmedium.com',
            libmedium: 'https://md.vern.cc/',
            archive: 'https://archive.is/newest/',
            archiveLi: 'https://archive.li/newest/',
            archiveVn: 'https://archive.vn/newest/',
            archivePh: 'https://archive.ph/newest/',
        },
        currentBypassIndex: getSetting('currentBypassIndex', 0),
        memberOnlyDivSelector: SELECTOR_MEMBER_DIV,
        autoRedirectDelay: getSetting('redirectDelay', 5000),
        autoRedirectEnabled: getSetting('autoRedirect', true),
        darkModeEnabled: getSetting('darkModeEnabled', false),
        isBypassSession: getSetting('isBypassSession', false),
    };

    const isMediumDomain = () => window.location.hostname.endsWith('medium.com') || isMediumCustomDomain();
    const isMediumCustomDomain = () => medium_custom_domains.includes(window.location.hostname);

    let bypassServiceKeys = Object.keys(config.bypassUrls);
    let isRedirecting = false;

    const injectStyles = () => {
        const style = document.createElement('style');
        style.textContent = `
            .${CLASS_SETTINGS} {
                position: fixed;
                top: 50%;
                left: 50%;
                transform: translate(-50%, -50%);
                width: 360px;
                background-color: var(--background-color, white);
                box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
                border-radius: 16px;
                font-family: 'Arial', sans-serif;
                z-index: 10000;
                padding: 20px;
                display: none;
                color: var(--text-color, #333);
                cursor: grab;
                user-select: none;
                -webkit-user-select: none;
                -moz-user-select: none;
                -ms-user-user-select: none;
            }
            .${CLASS_SETTINGS}.dark {
                --background-color: #333;
                --text-color: white;
            }
            .medium-settings-header {
                font-size: 22px;
                font-weight: bold;
                margin-bottom: 20px;
                text-align: center;
            }
            .medium-settings-toggle {
                margin: 15px 0;
                display: flex;
                justify-content: space-between;
                align-items: center;
            }
            .medium-settings-toggle > span {
                flex-grow: 1;
            }
            .medium-settings-input {
                margin-left: 10px;
                padding: 8px 10px;
                border: 1px solid #ccc;
                border-radius: 8px;
                box-sizing: border-box;
            }
            .medium-settings-input#redirectDelay {
                width: 70px;
            }
            .medium-settings-input#bypassSelector {
                width: 120px;
                appearance: auto;
                -webkit-appearance: auto;
                -moz-appearance: auto;
                background-repeat: no-repeat;
                background-position: right 10px center;
            }
            .${CLASS_SETTINGS}.dark .medium-settings-input#bypassSelector {
                border-color: #666;
            }
            .medium-settings-button {
                background-color: var(--button-bg-color, #1a8917);
                color: var(--button-text-color, white);
                border: none;
                padding: 8px 14px;
                border-radius: 20px;
                cursor: pointer;
                font-weight: bold;
                transition: background-color 0.3s;
            }
            .medium-settings-button:hover {
                background-color: #155c11;
            }
            .${CLASS_NOTIFICATION} {
                position: fixed;
                bottom: 20px;
                right: 20px;
                background-color: #1a8917;
                color: white;
                padding: 15px;
                border-radius: 20px;
                box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
                font-family: 'Arial', sans-serif;
                z-index: 10000;
                opacity: 0;
                transform: translateY(20px);
                transition: all 0.3s ease;
            }
            .${CLASS_NOTIFICATION}.show {
                opacity: 1;
                transform: translateY(0);
            }
            .medium-settings-input:focus {
                outline: none;
                border-color: #1a8917;
                box-shadow: 0 0 5px rgba(26, 137, 23, 0.3);
            }

            .switch {
              position: relative;
              display: inline-block;
              width: 40px;
              height: 24px;
            }

            .switch input {
              opacity: 0;
              width: 0;
              height: 0;
            }

            .slider {
              position: absolute;
              cursor: pointer;
              top: 0;
              left: 0;
              right: 0;
              bottom: 0;
              background-color: #ccc;
              transition: .4s;
            }

            .slider:before {
              position: absolute;
              content: "";
              height: 16px;
              width: 16px;
              left: 4px;
              bottom: 4px;
              background-color: white;
              transition: .4s;
            }

            input:checked + .slider {
              background-color: #1a8917;
            }

            input:focus + .slider {
              box-shadow: 0 0 1px #1a8917;
            }

            input:checked + .slider:before {
              transform: translateX(16px);
            }

            .slider.round {
              border-radius: 34px;
            }

            .slider.round:before {
              border-radius: 50%;
            }
        `;
        document.head.appendChild(style);
    };

    const stealthNotification = (message) => {
        const notification = document.createElement('div');
        notification.className = CLASS_NOTIFICATION;
        notification.textContent = message;
        document.body.appendChild(notification);

        setTimeout(() => notification.classList.add('show'), 50);
        setTimeout(() => {
            notification.classList.remove('show');
            setTimeout(() => notification.remove(), 300);
        }, 3000);
    };

    const getCurrentBypassService = () => {
        return bypassServiceKeys[config.currentBypassIndex % bypassServiceKeys.length];
    };

    const switchToNextBypassService = () => {
        config.currentBypassIndex++;
        setSetting('currentBypassIndex', config.currentBypassIndex);
        stealthNotification(`Trying next bypass service: ${getCurrentBypassService()}`);
    };

    const checkServiceAvailability = async () => {
        const availabilityPromises = Object.entries(config.bypassUrls).map(async ([key, url]) => {
            try {
                const response = await fetch(url, { method: 'HEAD', mode: 'no-cors' });
                return { key, available: response.ok || response.type === 'opaque' };
            } catch (error) {
                console.error(`Service unavailable: ${key} - ${url}`, error);
                return { key, available: false };
            }
        });
        const results = await Promise.allSettled(availabilityPromises);
        return results.reduce((acc, result) => {
            if (result.status === 'fulfilled') {
                acc[result.value.key] = result.value.available;
            }
            return acc;
        }, {});
    };

    const tryNextBypass = async (articleUrl, attemptNumber) => {
        switchToNextBypassService();
        const nextBypassService = getCurrentBypassService();
        if (nextBypassService) {
            autoBypass(articleUrl, nextBypassService, attemptNumber + 1);
        } else {
            console.error("No more bypass services to try.");
            stealthNotification("All bypass attempts failed.");
        }
    };

    const autoBypass = async (articleUrl, bypassKey, attemptNumber = 1) => {
        const bypassUrlValue = config.bypassUrls[bypassKey];
        const availability = await checkServiceAvailability();
        if (!availability[bypassKey]) {
            stealthNotification(`Service unavailable: ${bypassKey}`);
            return tryNextBypass(articleUrl, attemptNumber);
        }

        try {
            let bypassUrl;
            const mediumURL = new URL(decodeURIComponent(articleUrl));
            let pathname = mediumURL.pathname;

            if (bypassKey === 'libmedium') {
                if (pathname.startsWith('/')) {
                    pathname = pathname.substring(1);
                }
                bypassUrl = `${bypassUrlValue}${pathname}`;
            } else if (bypassKey.startsWith('archive')) {
                bypassUrl = bypassUrlValue + articleUrl + '#bypass';
            } else {
                const bypassBaseURL = new URL(bypassUrlValue);
                bypassUrl = new URL(mediumURL.pathname, bypassBaseURL).href;
            }
            isRedirecting = true;
            window.location.href = bypassUrl;
        } catch (error) {
            console.error(`Error during bypass with ${bypassKey}:`, error);
            stealthNotification(`Bypass failed with ${bypassKey}.`);
            tryNextBypass(articleUrl, attemptNumber);
        }
    };

    const attachSettingsListeners = (settingsContainer) => {
        settingsContainer.querySelector('#bypassSelector').addEventListener('change', (e) => {
            const selectedKey = e.target.value;
            config.currentBypassIndex = bypassServiceKeys.indexOf(selectedKey);
            setSetting('currentBypassIndex', config.currentBypassIndex);
            stealthNotification(`Bypass service set to ${selectedKey}`);
        });

        settingsContainer.querySelector('#toggleRedirectCheckbox').addEventListener('change', () => {
            config.autoRedirectEnabled = settingsContainer.querySelector('#toggleRedirectCheckbox').checked;
            setSetting('autoRedirect', config.autoRedirectEnabled);
            stealthNotification('Auto-Redirect toggled');
        });

        settingsContainer.querySelector('#toggleDarkModeCheckbox').addEventListener('change', () => {
            config.darkModeEnabled = settingsContainer.querySelector('#toggleDarkModeCheckbox').checked;
            setSetting('darkModeEnabled', config.darkModeEnabled);
            settingsContainer.classList.toggle('dark', config.darkModeEnabled);
            stealthNotification('Dark Mode toggled');
        });

        settingsContainer.querySelector('#bypassNow').addEventListener('click', async () => {
            stealthNotification('Attempting bypass...');
            const articleUrl = encodeURIComponent(window.location.href);
            const bypassService = getCurrentBypassService();
            setSetting('isBypassSession', true);
            await autoBypass(articleUrl, bypassService);
        });

        settingsContainer.querySelector('#resetDefaults').addEventListener('click', () => {
            config.autoRedirectDelay = 5000;
            config.autoRedirectEnabled = true;
            config.darkModeEnabled = false;
            config.currentBypassIndex = 0;

            setSetting('redirectDelay', config.autoRedirectDelay);
            setSetting('autoRedirect', config.autoRedirectEnabled);
            setSetting('darkModeEnabled', config.darkModeEnabled);
            setSetting('currentBypassIndex', config.currentBypassIndex);

            settingsContainer.querySelector('#redirectDelay').value = config.autoRedirectDelay;
            settingsContainer.querySelector('#toggleRedirectCheckbox').checked = config.autoRedirectEnabled;
            settingsContainer.querySelector('#toggleDarkModeCheckbox').checked = config.darkModeEnabled;
            settingsContainer.querySelector('#bypassSelector').innerHTML = bypassServiceKeys.map((key, index) => `
                <option value="${key}" ${index === config.currentBypassIndex ? 'selected' : ''}>${key}</option>
            `).join('');
            settingsContainer.classList.remove('dark');
            stealthNotification('Settings reset to defaults');
        });

        settingsContainer.querySelector('#saveSettings').addEventListener('click', () => {
            const newDelay = parseInt(settingsContainer.querySelector('#redirectDelay').value, 10);
            if (!isNaN(newDelay) && newDelay >= 0) {
                config.autoRedirectDelay = newDelay;
                setSetting('redirectDelay', newDelay);
                stealthNotification('Settings saved');
            }
        });

        settingsContainer.querySelector('#closeSettings').addEventListener('click', () => {
            settingsContainer.style.display = 'none';
        });

        // Removed preventDefault on mousedown to allow dropdown and input interaction
        // settingsContainer.querySelectorAll('.medium-settings-input').forEach(input => {
        //     input.addEventListener('mousedown', (e) => {
        //         e.preventDefault();
        //     });
        // });
    };

    const showMediumSettings = () => {
        let existingPanel = document.querySelector(`.${CLASS_SETTINGS}`);
        if (existingPanel) {
            existingPanel.style.display = 'block';
            return;
        }

        const settingsContainer = document.createElement('div');
        settingsContainer.className = `${CLASS_SETTINGS} ${config.darkModeEnabled ? 'dark' : ''}`;
        settingsContainer.innerHTML = `
            <div class="medium-settings-header">Medium Settings</div>
            <div class="medium-settings-toggle">
                <span>Auto-Redirect</span>
                <label class="switch">
                    <input type="checkbox" id="toggleRedirectCheckbox" ${config.autoRedirectEnabled ? 'checked' : ''}>
                    <span class="slider round"></span>
                </label>
            </div>
            <div class="medium-settings-toggle">
                <span>Redirect Delay (ms)</span>
                <input type="number" class="medium-settings-input" id="redirectDelay" value="${config.autoRedirectDelay}" />
            </div>
            <div class="medium-settings-toggle">
                <span>Dark Mode</span>
                <label class="switch">
                    <input type="checkbox" id="toggleDarkModeCheckbox" ${config.darkModeEnabled ? 'checked' : ''}>
                    <span class="slider round"></span>
                </label>
            </div>
            <div class="medium-settings-toggle">
                <span>Bypass Service</span>
                <select id="bypassSelector" class="medium-settings-input">
                    ${bypassServiceKeys.map((key, index) => `
                        <option value="${key}" ${index === config.currentBypassIndex ? 'selected' : ''}>${key}</option>
                    `).join('')}
                </select>
            </div>
            <div class="medium-settings-toggle">
                <button class="medium-settings-button" id="bypassNow">Bypass Now</button>
            </div>
            <div class="medium-settings-toggle">
                <button class="medium-settings-button" id="resetDefaults">Reset to Default</button>
            </div>
            <div class="medium-settings-toggle">
                <button class="medium-settings-button" id="saveSettings">Save</button>
                <button class="medium-settings-button" id="closeSettings">Close</button>
            </div>
        `;

        attachSettingsListeners(settingsContainer);

        let isDragging = false;
        let startX, startY;

        settingsContainer.addEventListener('mousedown', (e) => {
            if (e.target.closest('.medium-settings-input')) return; // Don't drag if interacting with input elements
            isDragging = true;
            startX = e.clientX - settingsContainer.offsetLeft;
            startY = e.clientY - settingsContainer.offsetTop;
            settingsContainer.style.cursor = 'grabbing';
        });

        document.addEventListener('mousemove', (e) => {
            if (!isDragging) return;
            settingsContainer.style.left = `${e.clientX - startX}px`;
            settingsContainer.style.top = `${e.clientY - startY}px`;
        });

        document.addEventListener('mouseup', () => {
            isDragging = false;
            settingsContainer.style.cursor = 'grab';
        });

        document.body.appendChild(settingsContainer);
        settingsContainer.style.display = 'block';
    };

    const performAutoRedirect = async () => {
        isRedirecting = false;

        if (config.isBypassSession) {
            setSetting('isBypassSession', false);
            return;
        }

        if (config.autoRedirectEnabled && document.querySelector(SELECTOR_MEMBER_WALL_CHECK) && !isRedirecting) {
            const availability = await checkServiceAvailability();
            let currentBypass = getCurrentBypassService();

            if (currentBypass && !availability[currentBypass]) {
                stealthNotification(`Current bypass service (${currentBypass}) is unavailable.`);
                switchToNextBypassService();
                const nextBypass = getCurrentBypassService();
                if (nextBypass) {
                    stealthNotification(`Attempting bypass with ${nextBypass}...`);
                    setTimeout(async () => {
                        const articleUrl = encodeURIComponent(window.location.href);
                        setSetting('isBypassSession', true);
                        await autoBypass(articleUrl, nextBypass);
                    }, config.autoRedirectDelay);
                } else {
                    stealthNotification("No available bypass services to try.");
                }
                return;
            }

            if (currentBypass) {
                stealthNotification(`Attempting bypass with ${currentBypass}...`);
                setTimeout(async () => {
                    const articleUrl = encodeURIComponent(window.location.href);
                    setSetting('isBypassSession', true);
                    if (currentBypass.startsWith('archive')) {
                        cleanBypassFragment();
                    }
                    await autoBypass(articleUrl, currentBypass);
                }, config.autoRedirectDelay);
            } else {
                stealthNotification("No available bypass services to try.");
            }
        }
    };

    const cleanBypassFragment = () => {
        const archiveDomains = ['archive.is', 'archive.li', 'archive.vn', 'archive.ph'];
        const currentDomain = window.location.hostname;

        if (archiveDomains.includes(currentDomain) && window.location.hash === '#bypass') {
            window.history.replaceState({}, document.title, window.location.pathname + window.location.search);
        }
    };

    const autoCloseFreediumBanner = () => {
        if (window.location.hostname === 'freedium.cfd') {
            window.addEventListener('load', () => {
                const closeButton = document.querySelector(SELECTOR_FREEDIUM_CLOSE_BUTTON);
                if (closeButton) {
                    closeButton.click();
                } else {
                    console.log('Freedium banner close button not found.');
                }
            });
        }
    };

    const initializeScript = () => {
        cleanBypassFragment();
        injectStyles();
        autoCloseFreediumBanner();

        if (isMediumDomain()) {
            GM_registerMenuCommand('Open Medium Settings', showMediumSettings);
            performAutoRedirect();
        } else if (Object.values(config.bypassUrls).some((url) => window.location.href.startsWith(url) || bypassServiceKeys.some(key => key.startsWith('archive') && window.location.href.startsWith(config.bypassUrls[key])))) {
            isRedirecting = false;
        }
    };

    initializeScript();
})();