/**
 * Turnstile 内置求解：等待 widget 自动完成 + token 轮询
 */
const { detectCloudflare, isTurnstileSolved, urlIndicatesCfChallenge } = require('./cf-detector');

/**
 * @typedef {Object} TurnstileResult
 * @property {boolean} success
 * @property {string} stage built_in|timeout|already_clear
 * @property {number} elapsedMs
 */

/**
 * 等待 Turnstile 通过（内置点击 / 自动跳转）
 * @param {import('puppeteer').Page} page
 * @param {{ timeoutMs?: number, pollMs?: number, useBuiltInClick?: boolean }} [options]
 * @returns {Promise<TurnstileResult>}
 */
async function waitForTurnstile(page, options = {}) {
    const timeoutMs = options.timeoutMs ?? 60000;
    const pollMs = options.pollMs ?? 500;
    const started = Date.now();

    const initial = await detectCloudflare(page);
    const initialUrlChallenge = urlIndicatesCfChallenge(page.url());

    if ((!initial.blocked && !initialUrlChallenge) || initial.hasCfClearance) {
        if (initial.hasCfClearance && !initialUrlChallenge) {
            return { success: true, stage: 'already_clear', elapsedMs: Date.now() - started };
        }
        if (!initial.blocked && !initialUrlChallenge) {
            return { success: true, stage: 'already_clear', elapsedMs: Date.now() - started };
        }
    }

    while (Date.now() - started < timeoutMs) {
        if (await isTurnstileSolved(page) && !urlIndicatesCfChallenge(page.url())) {
            return { success: true, stage: 'built_in', elapsedMs: Date.now() - started };
        }

        const state = await detectCloudflare(page);
        if (!state.blocked && !urlIndicatesCfChallenge(page.url()) && state.hasCfClearance) {
            return { success: true, stage: 'built_in', elapsedMs: Date.now() - started };
        }

        await new Promise((r) => setTimeout(r, pollMs));
    }

    return { success: false, stage: 'timeout', elapsedMs: Date.now() - started };
}

/**
 * 从页面提取 Turnstile sitekey
 * @param {import('puppeteer').Page} page
 * @returns {Promise<string|null>}
 */
async function extractTurnstileSitekey(page) {
    return page.evaluate(() => {
        const widget = document.querySelector('.cf-turnstile[data-sitekey], [data-sitekey]');
        if (widget) {
            return widget.getAttribute('data-sitekey');
        }
        const iframe = document.querySelector('iframe[src*="challenges.cloudflare.com"]');
        if (iframe && iframe.src) {
            const match = iframe.src.match(/[?&]sitekey=([^&]+)/);
            if (match) return decodeURIComponent(match[1]);
        }
        return null;
    }).catch(() => null);
}

/**
 * 将 Captcha API 返回的 token 注入页面
 * @param {import('puppeteer').Page} page
 * @param {string} token
 */
async function injectTurnstileToken(page, token) {
    await page.evaluate((turnstileToken) => {
        const input = document.querySelector('[name="cf-turnstile-response"]');
        if (input) {
            input.value = turnstileToken;
            input.dispatchEvent(new Event('input', { bubbles: true }));
            input.dispatchEvent(new Event('change', { bubbles: true }));
        }
        const form = document.querySelector('form');
        if (form) {
            form.submit();
        }
    }, token);
}

module.exports = {
    waitForTurnstile,
    extractTurnstileSitekey,
    injectTurnstileToken,
};