/**
 * AKSRT CMS Download
 *
 * 功能：
 *   - 监听 [data-action="aksrt-download"] 按钮点击
 *   - 调 POST /aksrt/v1/download/request
 *   - 弹窗显示下载链接（含提取码）
 *
 * 依赖：
 *   - window.aksrtData.{ ajaxUrl, nonce, siteUrl }
 *   - 主题已加载 fetch (现代浏览器)
 */
(function () {
	'use strict';

	if (!window.aksrtData) return;
	const REST_BASE = window.aksrtData.siteUrl ? window.aksrtData.siteUrl.replace(/\/$/, '') + '/wp-json/aksrt/v1' : '/wp-json/aksrt/v1';

	function tt(key, zh) { return zh; }

	function escapeHtml(value) {
		return String(value == null ? '' : value)
			.replace(/&/g, '&')
			.replace(/</g, '&lt;')
			.replace(/>/g, '&gt;')
			.replace(/"/g, '&quot;')
			.replace(/'/g, '&#039;');
	}

	function escapeAttr(value) {
		return escapeHtml(value);
	}

	// ===== Focus trap state =====
	let lastFocusedElement = null;

	function getFocusableElements(container) {
		if (!container) return [];
		return Array.prototype.slice.call(container.querySelectorAll(
			'a[href], area[href], button:not([disabled]), input:not([disabled]):not([type="hidden"]),' +
			' select:not([disabled]), textarea:not([disabled]), [tabindex]:not([tabindex="-1"])'
		)).filter(function (el) {
			return !!(el.offsetWidth || el.offsetHeight || el.getClientRects().length);
		});
	}

	function trapFocus(e, modal) {
		if (e.key !== 'Tab') return;
		const focusables = getFocusableElements(modal);
		if (!focusables.length) {
			e.preventDefault();
			return;
		}
		const first = focusables[0];
		const last = focusables[focusables.length - 1];
		if (e.shiftKey && document.activeElement === first) {
			e.preventDefault();
			last.focus();
		} else if (!e.shiftKey && document.activeElement === last) {
			e.preventDefault();
			first.focus();
		}
	}

	// ===== Modal helper =====
	function buildModal() {
		let modal = document.getElementById('aksrt-dl-modal');
		if (modal) return modal;
		modal = document.createElement('div');
		modal.id = 'aksrt-dl-modal';
		modal.className = 'aksrt-dl-modal';
		modal.setAttribute('role', 'dialog');
		modal.setAttribute('aria-modal', 'true');
		modal.setAttribute('aria-hidden', 'true');
		modal.setAttribute('aria-labelledby', 'aksrt-dl-modal-title');
		modal.innerHTML =
			'<div class="aksrt-dl-modal__backdrop" data-close></div>' +
			'<div class="aksrt-dl-modal__panel" role="document" tabindex="-1">' +
			'  <button type="button" class="aksrt-dl-modal__close" aria-label="' + tt('close', '关闭') + '" data-close>×</button>' +
			'  <div class="aksrt-dl-modal__body" data-body></div>' +
			'</div>';
		document.body.appendChild(modal);

		modal.addEventListener('click', function (e) {
			if (e.target.matches('[data-close]')) close();
		});
		modal.addEventListener('keydown', function (e) {
			if (e.key === 'Escape' && modal.classList.contains('is-open')) {
				e.preventDefault();
				close();
			} else if (e.key === 'Tab' && modal.classList.contains('is-open')) {
				trapFocus(e, modal);
			}
		});
		return modal;
	}

	function open(html, returnFocusEl) {
		// 记录调用方按钮以便关闭后回焦
		lastFocusedElement = returnFocusEl || document.activeElement;

		const modal = buildModal();
		const body = modal.querySelector('[data-body]');
		// 给标题加 id，与 aria-labelledby 联动
		body.innerHTML = html.replace(/aksrt-dl-modal__title/, 'aksrt-dl-modal__title" id="aksrt-dl-modal-title');
		modal.classList.add('is-open');
		modal.setAttribute('aria-hidden', 'false');
		document.body.classList.add('aksrt-dl-modal-open');

		// 进入后将焦点放在第一个可聚焦元素，否则放 panel
		setTimeout(function () {
			const focusables = getFocusableElements(modal);
			if (focusables.length) {
				focusables[0].focus();
			} else {
				modal.querySelector('.aksrt-dl-modal__panel').focus();
			}
		}, 0);
	}

	function close() {
		const modal = document.getElementById('aksrt-dl-modal');
		if (!modal) return;
		modal.classList.remove('is-open');
		modal.setAttribute('aria-hidden', 'true');
		document.body.classList.remove('aksrt-dl-modal-open');
		// 焦点回到触发按钮
		if (lastFocusedElement && typeof lastFocusedElement.focus === 'function') {
			try { lastFocusedElement.focus(); } catch (_) { /* ignore */ }
		}
		lastFocusedElement = null;
	}

	// ===== 错误提示渲染 =====
	function renderError(msg, data, returnFocusEl, code) {
		let title = tt('failed', '下载失败');
		let extra = '';

		if (code === 'aksrt_need_login' && data && data.login_url) {
			title = tt('need_login', '请先登录');
			msg = tt('login_hint', '登录后即可继续下载，访客不可使用此资源。');
			extra = '<a class="btn-primary btn-sm" href="' + data.login_url + '">' + tt('go_login', '前往登录') + '</a>';
		} else if (code === 'aksrt_need_purchase') {
			title = tt('need_purchase', '请先购买');
			msg = msg || tt('purchase_hint', '请先完成购买后再下载该资源。');
			extra = '<button type="button" class="btn-primary btn-sm" data-aksrt-open-cashier="' + escapeAttr((data && data.post_id) || '') + '">' + tt('go_buy', '去购买') + '</button>';
		} else if (code === 'aksrt_need_vip') {
			title = tt('need_vip', '会员专属');
			msg = msg || tt('vip_hint', '该资源仅限会员购买/下载。');
			if (data && data.vip_url) {
				extra = '<a class="btn-primary btn-sm" href="' + escapeAttr(data.vip_url) + '">' + tt('go_vip', '开通会员') + '</a>';
			}
		} else if (code === 'aksrt_credits_insufficient' || code === 'aksrt_balance_insufficient') {
			title = tt('credit_low', '积分不够');
			const balance = typeof (data && data.balance) === 'number' ? data.balance : 0;
			const cost = typeof (data && data.cost) === 'number' ? data.cost : 0;
			msg = tt('credit_hint',
				'当前余额 ' + balance + ' 积分，需要 ' + cost + ' 积分。可通过签到、阅读、邀请好友等方式获取积分。'
			);
			if (data && data.credits_url) {
				extra = '<a class="btn-primary btn-sm" href="' + escapeAttr(data.credits_url) + '">' + tt('my_points', '我的积分') + '</a>';
			}
		} else if (code === 'aksrt_download_limit') {
			title = tt('quota_over', '今日免费额度已用完');
			msg = msg || tt('quota_hint', '您今日下载免费资源个数已超限，请明日再下载。');
			if (data && data.allow_limit_over && data.post_id) {
				extra = '<button type="button" class="btn-primary btn-sm" data-aksrt-open-cashier="' + escapeAttr(data.post_id) + '" data-price-type="download_limit_over">' + tt('buy_over', '立即购买') + '</button>';
			}
		} else if (code === 'aksrt_captcha_failed') {
			title = tt('captcha_fail', '验证失败');
			msg = msg || tt('captcha_retry', '人机验证失败，请重试。');
		} else if (data && data.login_url) {
			extra = '<a class="btn-primary btn-sm" href="' + data.login_url + '">' + tt('go_login', '前往登录') + '</a>';
		}

		open(
			'<h3 class="aksrt-dl-modal__title">' + title + '</h3>' +
			'<p class="aksrt-dl-modal__msg">' + (msg || '') + '</p>' +
			(extra ? '<div class="aksrt-dl-modal__actions">' + extra + '</div>' : ''),
			returnFocusEl
		);

		const openCashierBtn = document.querySelector('[data-aksrt-open-cashier]');
		if (openCashierBtn) {
			openCashierBtn.addEventListener('click', function () {
				const pid = parseInt(openCashierBtn.getAttribute('data-aksrt-open-cashier'), 10) || 0;
				const pt = openCashierBtn.getAttribute('data-price-type') || '';
				close();
				if (pid) openCashier(pid, returnFocusEl, pt);
			});
		}
	}

	// ===== 成功渲染 =====
	function renderSuccess(payload, returnFocusEl) {
		const code = String(payload.extract_code || '').trim();
		const has = !!payload.has_extract || code !== '';
		const safeCode = escapeHtml(code);
		const safeCodeAttr = escapeAttr(code);
		const dlUrl = escapeAttr(payload.dl_url || '#');
		const extractHtml = code !== ''
			? '<div class="aksrt-dl-modal__row"><span class="aksrt-dl-modal__label">' + tt('extract', '提取码') + '</span><code class="aksrt-dl-modal__code">' + safeCode + '</code><button type="button" class="aksrt-dl-modal__copy" data-copy="' + safeCodeAttr + '"><span class="aksrt-dl-modal__copy-text">' + tt('copy', '复制') + '</span></button></div>'
			: (has ? '<p class="aksrt-dl-modal__msg aksrt-dl-modal__msg--warn">' + tt('extract_missing', '下载源标记了提取码，但接口未返回具体内容，请检查资源下载源的 extract_code 字段。') + '</p>' : '');
		open(
			'<h3 class="aksrt-dl-modal__title">' + tt('ready', '下载已就绪') + '</h3>' +
			(extractHtml || '<p class="aksrt-dl-modal__msg">' + tt('hint', '点击下方按钮开始下载，链接 10 分钟内有效。') + '</p>') +
			'<div class="aksrt-dl-modal__actions">' +
			'  <a class="btn-primary aksrt-dl-modal__download" href="' + dlUrl + '" target="_blank" rel="noopener noreferrer">' + tt('go', '立即下载') + '</a>' +
			(typeof payload.balance === 'number' ? '  <span class="aksrt-dl-modal__balance">' + tt('balance', '余额：') + payload.balance + '</span>' : '') +
			'</div>',
			returnFocusEl
		);

		// 复制按钮
		document.querySelectorAll('[data-copy]').forEach(function (btn) {
			btn.addEventListener('click', function () {
				const text = btn.getAttribute('data-copy') || '';
				const label = btn.querySelector('.aksrt-dl-modal__copy-text') || btn;
				if (navigator.clipboard) {
					navigator.clipboard.writeText(text).then(function () {
						label.textContent = tt('copied', '已复制');
						setTimeout(function () { label.textContent = tt('copy', '复制'); }, 2000);
					});
				}
			});
		});
	}

	// ===== 主流程 =====
	function collectCaptchaPayload(sourceEl) {
		// 优先从触发按钮所属的下载卡片中查找验证码容器（支持双下载框场景：侧栏+移动端）
		var container = null;
		if (sourceEl) {
			var box = sourceEl.closest('.resource-download-box');
			if (box) container = box.querySelector('[data-aksrt-download-captcha]');
		}
		// 回退到全局查找
		if (!container) container = document.querySelector('[data-aksrt-download-captcha]');
		if (!container) return {};
		const out = {};
		const keys = [
			'captcha_verified',
			'cf_turnstile_response',
			'tencent_ticket', 'tencent_randstr', 'tencent_sid',
			'geetest_lot_number', 'geetest_captcha_output', 'geetest_pass_token', 'geetest_gen_time',
			'aliyun_captcha_verify_param',
		];
		keys.forEach(function (k) {
			const el = container.querySelector('input[name="' + k + '"]');
			if (el && el.value !== '') out[k] = el.value;
		});
		return out;
	}

	function isCaptchaActive() {
		const card = document.querySelector('.resource-download-box');
		if (!card) return false;
		return card.getAttribute('data-captcha') === '1';
	}

	function ensureCaptchaThen(callback) {
		if (!isCaptchaActive()) { callback(); return; }
		const state = window.AKSRTCaptchaState;
		const scene = state && state.scenes && state.scenes.download;
		if (!scene || typeof scene.verify !== 'function') {
			// captcha 组件未就绪：不直发，避免绕过服务端门槛
			if (window.console && console.warn) {
				console.warn('[AKSRT] download captcha not ready');
			}
			alert(tt('captcha_loading', '验证码组件加载中，请稍候再试'));
			return;
		}
		scene.verify(function () { callback(); });
	}

	function performDownloadRequest(button) {
		const card = button.closest('.resource-download-box');
		if (!card) return;
		const postId = parseInt(card.getAttribute('data-post-id'), 10);
		const sourceIndex = parseInt(button.getAttribute('data-source-index'), 10);
		if (!postId || isNaN(sourceIndex)) return;

		button.disabled = true;
		const original = button.innerHTML;
		button.innerHTML = '<i class="fa fas fa-spinner fa-spin" aria-hidden="true"></i> ' + tt('processing', '处理中…');

		const restNonce = window.aksrtData.restNonce || '';
		const captchaPayload = collectCaptchaPayload(button);

		fetch(REST_BASE + '/download/request', {
			method: 'POST',
			credentials: 'same-origin',
			headers: {
				'Content-Type': 'application/json',
				'X-WP-Nonce': restNonce,
			},
			body: JSON.stringify({
				post_id: postId,
				source_index: sourceIndex,
				captcha: captchaPayload,
			}),
		})
			.then(function (resp) { return resp.json().then(function (j) { return { ok: resp.ok, json: j }; }); })
			.then(function (r) {
				button.disabled = false;
				button.innerHTML = original;
				if (!r.ok || (r.json && r.json.code)) {
					renderError(r.json.message || tt('default_err', '请稍后重试'), r.json.data || {}, button, r.json.code);
					// 验证码已被消费，重置以便用户重试
					try {
						const scene = window.AKSRTCaptchaState && window.AKSRTCaptchaState.scenes && window.AKSRTCaptchaState.scenes.download;
						if (scene && typeof scene.reset === 'function') scene.reset();
					} catch (_) { /* ignore */ }
					return;
				}
				renderSuccess(r.json, button);
			})
			.catch(function () {
				button.disabled = false;
				button.innerHTML = original;
				renderError(tt('network_err', '网络错误，请稍后重试'), {}, button);
			});
	}

	function requestDownload(button) {
		ensureCaptchaThen(function () {
			performDownloadRequest(button);
		});
	}

	function pollOrderPaid(orderNumber, returnFocusEl) {
		if (!orderNumber) return;
		let tries = 0;
		const maxTries = 40;
		const timer = setInterval(function () {
			tries += 1;
			fetch(REST_BASE + '/pay/content/order/' + encodeURIComponent(orderNumber), {
				method: 'GET',
				credentials: 'same-origin',
				headers: restHeaders(),
			})
				.then(function (resp) { return resp.json().then(function (j) { return { ok: resp.ok, json: j }; }); })
				.then(function (r) {
					if (r.ok && r.json && r.json.paid) {
						clearInterval(timer);
						window.location.reload();
					}
				})
				.catch(function () { /* ignore */ });
			if (tries >= maxTries) clearInterval(timer);
		}, 3000);
	}

	// ===== 积分不足按钮（前置拦截，不发请求） =====
	function showLowCreditModal(button) {
		const balance = parseInt(button.getAttribute('data-balance'), 10) || 0;
		const cost = parseInt(button.getAttribute('data-cost'), 10) || 0;
		renderError('', { balance: balance, cost: cost }, button, 'aksrt_credits_insufficient');
	}

	// ===== 收银台（内容购买） =====
	function restHeaders() {
		return {
			'Content-Type': 'application/json',
			'X-WP-Nonce': window.aksrtData.restNonce || '',
		};
	}

	function payApiBase(apiKind) {
		return '/pay/content/';
	}

	function buildPreviewUrl(postId, priceType, couponCode, apiKind) {
		apiKind = apiKind || 'content';
		var previewUrl = REST_BASE + payApiBase(apiKind) + postId;
		var qs = [];
		if (priceType) qs.push('price_type=' + encodeURIComponent(priceType));
		if (couponCode) qs.push('coupon_code=' + encodeURIComponent(couponCode));
		if (qs.length) previewUrl += '?' + qs.join('&');
		return previewUrl;
	}

	function fetchPreview(postId, priceType, couponCode, apiKind) {
		return fetch(buildPreviewUrl(postId, priceType, couponCode, apiKind), {
			method: 'GET',
			credentials: 'same-origin',
			headers: restHeaders(),
		}).then(function (resp) {
			return resp.json().then(function (j) { return { ok: resp.ok, status: resp.status, json: j }; });
		});
	}

	function openCashier(postId, returnFocusEl, priceType, couponCode, apiKind) {
		if (!postId) return;
		priceType = priceType || '';
		couponCode = couponCode || '';
		apiKind = apiKind || 'content';
		open(
			'<h3 class="aksrt-dl-modal__title">' + tt('cashier_loading', '确认购买') + '</h3>' +
			'<p class="aksrt-dl-modal__msg">' + tt('loading', '加载中…') + '</p>',
			returnFocusEl
		);

		fetchPreview(postId, priceType, couponCode, apiKind)
			.then(function (r) {
				if (!r.ok || (r.json && r.json.code)) {
					const code = r.json && r.json.code ? r.json.code : '';
					const data = (r.json && r.json.data) || {};
					if (code === 'aksrt_need_login' || r.status === 401) {
						renderError(r.json.message || '', data, returnFocusEl, 'aksrt_need_login');
						return;
					}
					if (code === 'aksrt_need_vip') {
						renderError(r.json.message || '', data, returnFocusEl, 'aksrt_need_vip');
						return;
					}
					if (code === 'aksrt_already_paid' || code === 'aksrt_already_followed') {
						window.location.reload();
						return;
					}
					renderError((r.json && r.json.message) || tt('default_err', '请稍后重试'), data, returnFocusEl, code);
					return;
				}
				var prev = r.json || {};
				if (priceType) prev._price_type = priceType;
				if (couponCode) prev._coupon_code = couponCode;
				prev._api_kind = apiKind;
				renderCashier(prev, returnFocusEl);
			})
			.catch(function () {
				renderError(tt('network_err', '网络错误，请稍后重试'), {}, returnFocusEl);
			});
	}

	function renderCashier(preview, returnFocusEl) {
		if (!preview) return;
		if (preview.need_login && !preview.allow_guest) {
			renderError('', { login_url: preview.login_url }, returnFocusEl, 'aksrt_need_login');
			return;
		}
		if (preview.need_vip) {
			renderError('', { vip_url: preview.vip_url }, returnFocusEl, 'aksrt_need_vip');
			return;
		}
		if (preview.has_paid_access) {
			window.location.reload();
			return;
		}
		// Content free: reload.
		if (preview.is_free) {
			window.location.reload();
			return;
		}

		const isPoints = preview.pay_modo === 'points';
		const priceType = (preview._price_type || preview.price_type || '');
		const apiKind = preview._api_kind || 'content';

		let amountLabel = escapeHtml(preview.amount_label || '');
		let baseLabel = escapeHtml(preview.base_label || '');
		const listLabel = escapeHtml(preview.list_amount_label || preview.amount_label || amountLabel);
		if (priceType === 'download_limit_over' && preview.download_limit_over_label && !preview.discounts) {
			amountLabel = escapeHtml(preview.download_limit_over_label);
			baseLabel = amountLabel;
			preview.amount = preview.download_limit_over_price;
			preview.base = preview.download_limit_over_price;
		}
		const title = escapeHtml(preview.title || '');
		const typeLabel = escapeHtml(preview.pay_type_label || '');
		const balance = typeof preview.balance === 'number' ? preview.balance : 0;
		const methods = Array.isArray(preview.payment_methods) ? preview.payment_methods : [];
		const couponAllowed = !isPoints && !!preview.coupon_allowed;
		const couponCodeVal = escapeAttr(preview.coupon_code || preview._coupon_code || '');

		let priceRows = '';
		if (!preview.pay_limit) {
			priceRows += '<div class="aksrt-cashier__row"><span>' + tt('price', '价格') + '</span><b>' + baseLabel + '</b></div>';
		}
		// VIP list price row when VIP reduced list amount.
		if (typeof preview.list_amount === 'number' && typeof preview.base === 'number' && preview.list_amount !== preview.base) {
			priceRows += '<div class="aksrt-cashier__row"><span>' + tt('vip_price', '会员价') + '</span><b class="is-sale">' + listLabel + '</b></div>';
		} else if (preview.amount !== preview.base && !preview.rebate_discount && !preview.coupon_discount) {
			priceRows += '<div class="aksrt-cashier__row"><span>' + tt('vip_price', '会员价') + '</span><b class="is-sale">' + amountLabel + '</b></div>';
		}
		if (preview.rebate_discount > 0) {
			priceRows += '<div class="aksrt-cashier__row"><span>' + tt('rebate_discount', '推广折扣') + '</span><b class="is-sale">' + escapeHtml(preview.rebate_discount_label || ('-' + preview.rebate_discount)) + '</b></div>';
		}
		if (preview.coupon_discount > 0) {
			priceRows += '<div class="aksrt-cashier__row"><span>' + tt('coupon_discount', '优惠码') + '</span><b class="is-sale">' + escapeHtml(preview.coupon_discount_label || ('-' + preview.coupon_discount)) + '</b></div>';
		}
		priceRows += '<div class="aksrt-cashier__row"><span>' + tt('pay_amount', '支付金额') + '</span><b class="is-sale">' + amountLabel + '</b></div>';

		let body = '';
		body += '<div class="aksrt-cashier__product"><span class="aksrt-cashier__tag">' + typeLabel + '</span><span>' + title + '</span></div>';
		body += '<div class="aksrt-cashier__box">' + priceRows + '</div>';

		if (isPoints) {
			body += '<div class="aksrt-cashier__box"><div class="aksrt-cashier__row"><span>' + tt('my_points', '我的积分') + '</span><b class="is-ok">' + balance + '</b></div></div>';
			if (!preview.balance_enough) {
				body += '<div class="aksrt-cashier__warn">' + tt('points_short', '抱歉，您的积分不足，暂时无法支付') + '</div>';
				body += '<div class="aksrt-dl-modal__actions">';
				if (preview.credits_url) {
					body += '<a class="btn-primary btn-sm" href="' + escapeAttr(preview.credits_url) + '">' + tt('my_points', '我的积分') + '</a>';
				}
				body += '</div>';
				open('<h3 class="aksrt-dl-modal__title">' + tt('confirm_buy', '确认购买') + '</h3>' + body, returnFocusEl);
				return;
			}
			body += '<div class="aksrt-dl-modal__actions">';
			body += '<button type="button" class="btn-primary aksrt-dl-modal__download" data-aksrt-pay-submit data-mode="points" data-price-type="' + escapeAttr(priceType) + '">' + tt('pay_now', '立即支付') + ' ' + amountLabel + '</button>';
			body += '</div>';
		} else {
			if (couponAllowed) {
				body += '<div class="aksrt-cashier__coupon">';
				body += '<div class="aksrt-cashier__methods-title">' + tt('use_coupon', '使用优惠码') + '</div>';
				body += '<div class="aksrt-cashier__coupon-row">';
				body += '<input type="text" class="aksrt-cashier__coupon-input" name="aksrt_coupon_code" value="' + couponCodeVal + '" placeholder="' + escapeAttr(tt('enter_coupon', '请输入优惠码')) + '" autocomplete="off">';
				body += '<button type="button" class="btn-sm" data-aksrt-check-coupon>' + tt('check_coupon', '检查优惠码') + '</button>';
				body += '</div>';
				if (preview.coupon_desc) {
					body += '<div class="aksrt-cashier__coupon-desc">' + escapeHtml(preview.coupon_desc) + '</div>';
				}
				if (preview.coupon_error) {
					body += '<div class="aksrt-cashier__warn">' + escapeHtml(preview.coupon_error) + '</div>';
				} else if (preview.coupon_discount > 0) {
					body += '<div class="aksrt-cashier__coupon-ok">' + tt('coupon_ok', '优惠码可用') + '</div>';
				}
				body += '</div>';
			}
			const walletBal = typeof preview.wallet_balance === 'number'
					? preview.wallet_balance
					: (typeof preview.balance === 'number' ? preview.balance : 0);
				const hasBalanceMethod = methods.some(function (m) { return (m && m.id) === 'balance'; });
				if (hasBalanceMethod) {
					body += '<div class="aksrt-cashier__box"><div class="aksrt-cashier__row"><span>' + tt('my_wallet', '我的余额') + '</span><b class="is-ok">￥' + Number(walletBal).toFixed(2) + '</b></div></div>';
					if (preview.balance_enough === false) {
						body += '<div class="aksrt-cashier__warn">' + tt('wallet_short', '余额不足，请先充值或选择其他支付方式') + '</div>';
						if (preview.credits_url) {
							body += '<div class="aksrt-dl-modal__actions"><a class="btn-sm" href="' + escapeAttr(preview.credits_url) + '">' + tt('go_recharge', '去充值') + '</a></div>';
						}
					}
				}
				let methodHtml = '';
				methods.forEach(function (m, idx) {
					const id = escapeAttr(m.id || '');
					const name = escapeHtml(m.name || id);
					methodHtml += '<label class="aksrt-cashier__method"><input type="radio" name="aksrt_pay_method" value="' + id + '"' + (idx === 0 ? ' checked' : '') + '> <span>' + name + '</span></label>';
				});
				if (methodHtml) {
					body += '<div class="aksrt-cashier__methods"><div class="aksrt-cashier__methods-title">' + tt('pay_method', '支付方式') + '</div>' + methodHtml + '</div>';
				} else {
					body += '<div class="aksrt-cashier__warn">' + tt('no_pay_method', '暂无可用支付方式，请联系站长配置收款接口') + '</div>';
				}
				body += '<div class="aksrt-dl-modal__actions">';
				if (methodHtml) {
					body += '<button type="button" class="btn-primary aksrt-dl-modal__download" data-aksrt-pay-submit data-mode="cash" data-price-type="' + escapeAttr(priceType) + '">' + tt('pay_now', '立即支付') + ' ' + amountLabel + '</button>';
				}
				body += '</div>';
		}

		open('<h3 class="aksrt-dl-modal__title">' + tt('confirm_buy', '确认购买') + '</h3>' + body, returnFocusEl);

		const checkBtn = document.querySelector('[data-aksrt-check-coupon]');
		if (checkBtn) {
			checkBtn.addEventListener('click', function () {
				const input = document.querySelector('input[name="aksrt_coupon_code"]');
				const code = input ? String(input.value || '').trim() : '';
				if (!code) {
					if (input) input.focus();
					return;
				}
				checkBtn.disabled = true;
				const old = checkBtn.innerHTML;
				checkBtn.innerHTML = tt('checking', '检查中…');
				fetchPreview(preview.post_id, priceType, code, apiKind)
					.then(function (r) {
						checkBtn.disabled = false;
						checkBtn.innerHTML = old;
						if (!r.ok || (r.json && r.json.code && !r.json.amount && r.json.amount !== 0)) {
							renderError((r.json && r.json.message) || tt('default_err', '请稍后重试'), (r.json && r.json.data) || {}, returnFocusEl, (r.json && r.json.code) || '');
							return;
						}
						var prev = r.json || {};
						if (priceType) prev._price_type = priceType;
						prev._coupon_code = code;
						prev._api_kind = apiKind;
						renderCashier(prev, returnFocusEl);
					})
					.catch(function () {
						checkBtn.disabled = false;
						checkBtn.innerHTML = old;
						renderError(tt('network_err', '网络错误，请稍后重试'), {}, returnFocusEl);
					});
			});
		}

		const submitBtn = document.querySelector('[data-aksrt-pay-submit]');
		if (submitBtn) {
			submitBtn.addEventListener('click', function () {
				const mode = submitBtn.getAttribute('data-mode') || (isPoints ? 'points' : 'cash');
				let paymentMethod = 'balance';
				const checked = document.querySelector('input[name="aksrt_pay_method"]:checked');
				if (checked) paymentMethod = checked.value;
				const input = document.querySelector('input[name="aksrt_coupon_code"]');
				const code = input ? String(input.value || '').trim() : (preview.coupon_code || preview._coupon_code || '');
				submitPurchase(preview.post_id, mode, paymentMethod, submitBtn, returnFocusEl, code, apiKind);
			});
		}
	}

	function submitPurchase(postId, mode, paymentMethod, button, returnFocusEl, couponCode, apiKind) {
		if (!postId) return;
		apiKind = apiKind || 'content';
		const original = button.innerHTML;
		button.disabled = true;
		button.innerHTML = tt('processing', '处理中…');

		const payload = { mode: mode };
		if (mode === 'cash') payload.payment_method = paymentMethod || 'balance';
		const pt = button.getAttribute('data-price-type') || '';
		if (pt) payload.price_type = pt;
		if (mode === 'cash' && couponCode) payload.coupon_code = couponCode;

		fetch(REST_BASE + payApiBase(apiKind) + postId, {
			method: 'POST',
			credentials: 'same-origin',
			headers: restHeaders(),
			body: JSON.stringify(payload),
		})
			.then(function (resp) { return resp.json().then(function (j) { return { ok: resp.ok, status: resp.status, json: j }; }); })
			.then(function (r) {
				button.disabled = false;
				button.innerHTML = original;
				if (!r.ok || (r.json && r.json.code && !r.json.success)) {
					const code = r.json && r.json.code ? r.json.code : '';
					const data = (r.json && r.json.data) || {};
					if (code === 'aksrt_already_paid' || code === 'aksrt_already_followed') {
						window.location.reload();
						return;
					}
					renderError((r.json && r.json.message) || tt('default_err', '请稍后重试'), data, returnFocusEl, code);
					return;
				}
				const data = (r.json && r.json.data) ? r.json.data : r.json;
				if (data && data.redirect && (data.payment_url || data.qr_content)) {
					if (data.payment_url) {
						window.open(data.payment_url, '_blank');
					}
					open(
						'<h3 class="aksrt-dl-modal__title">' + tt('scan_pay', '扫码支付') + '</h3>' +
						'<p class="aksrt-dl-modal__msg">' + escapeHtml(data.message || tt('scan_hint', '请使用手机扫码完成支付，支付后刷新页面。')) + '</p>' +
						(data.qr_content ? ('<p class="aksrt-dl-modal__msg"><code>' + escapeHtml(data.qr_content || '') + '</code></p>') : '') +
						'<div class="aksrt-dl-modal__actions"><button type="button" class="btn-primary btn-sm" data-aksrt-reload>' + tt('paid_refresh', '我已支付') + '</button></div>',
						returnFocusEl
					);
					const reloadBtn = document.querySelector('[data-aksrt-reload]');
					if (reloadBtn) reloadBtn.addEventListener('click', function () { window.location.reload(); });
					if (data.order_number) pollOrderPaid(data.order_number, returnFocusEl);
					return;
				}
				window.location.reload();
			})
			.catch(function () {
				button.disabled = false;
				button.innerHTML = original;
				renderError(tt('network_err', '网络错误，请稍后重试'), {}, returnFocusEl);
			});
	}

	// ===== 事件绑定 =====
	document.addEventListener('click', function (e) {
		const lowBtn = e.target.closest('[data-action="aksrt-need-credits"]');
		if (lowBtn) {
			e.preventDefault();
			showLowCreditModal(lowBtn);
			return;
		}

		const buyBtn = e.target.closest('[data-action="aksrt-need-purchase"], [data-aksrt-pay-content]');
		if (buyBtn) {
			e.preventDefault();
			const postId = parseInt(
				buyBtn.getAttribute('data-aksrt-pay-content') ||
				buyBtn.getAttribute('data-post-id') ||
				(buyBtn.closest('[data-post-id]') && buyBtn.closest('[data-post-id]').getAttribute('data-post-id')) ||
				'0',
				10
			);
			const priceType = buyBtn.getAttribute('data-price-type') || '';
			if (postId) openCashier(postId, buyBtn, priceType, '', 'content');
			return;
		}

		const cashierLink = e.target.closest('.cashier-link');
		if (cashierLink && cashierLink.hasAttribute('data-aksrt-pay-content')) {
			e.preventDefault();
			const postId = parseInt(cashierLink.getAttribute('data-aksrt-pay-content') || '0', 10);
			if (postId) openCashier(postId, cashierLink, '', '', 'content');
			return;
		}

		const btn = e.target.closest('[data-action="aksrt-download"]');
		if (!btn) return;
		if (btn.disabled || btn.getAttribute('aria-disabled') === 'true') return;
		e.preventDefault();
		requestDownload(btn);
	});

	// Public cashier bridge (content pay).
	window.aksrtOpenCashier = function (postId, returnFocusEl, priceType, couponCode, apiKind) {
		openCashier(postId, returnFocusEl || null, priceType || '', couponCode || '', apiKind || 'content');
	};

	// ===== 注入 modal 基础样式（避免必须额外加载 CSS）=====
	const style = document.createElement('style');
	style.textContent =
		'.aksrt-dl-modal{position:fixed;inset:0;z-index:10000;display:none;}' +
		'.aksrt-dl-modal.is-open{display:flex;align-items:center;justify-content:center;}' +
		'.aksrt-dl-modal__backdrop{position:absolute;inset:0;background:rgba(0,0,0,.55);}' +
		'.aksrt-dl-modal__panel{position:relative;background:#fff;border-radius:14px;padding:26px 28px 24px;width:min(420px,calc(100vw - 32px));box-shadow:0 24px 56px rgba(15,23,42,.24);color:#111827;}' +
		'.aksrt-dl-modal__close{position:absolute;top:10px;right:12px;background:transparent;border:0;font-size:24px;line-height:1;cursor:pointer;color:#6b7280;}' +
		'.aksrt-dl-modal__title{font:700 20px/1.3 inherit;margin:0 28px 18px 0;color:#111827;}' +
		'.aksrt-dl-modal__msg{margin:0 0 18px;color:#4b5563;font-size:14px;line-height:1.65;}' +
		'.aksrt-dl-modal__msg--warn{color:#92400e;background:transparent;border:0;border-top:1px solid #fde68a;border-bottom:1px solid #fde68a;padding:12px 0;}' +
		'.aksrt-dl-modal__row{display:grid;grid-template-columns:64px minmax(0,1fr) 72px;align-items:center;gap:12px;margin:0 0 18px;padding:12px 0;border-top:1px solid #e5e7eb;border-bottom:1px solid #e5e7eb;}' +
		'.aksrt-dl-modal__label{font-size:13px;font-weight:600;color:#6b7280;white-space:nowrap;}' +
		'.aksrt-dl-modal__code{display:block;min-width:0;color:#111827;font:800 18px/1.25 ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;letter-spacing:.06em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}' +
		'.aksrt-dl-modal__copy{appearance:none!important;display:inline-flex!important;align-items:center!important;justify-content:center!important;width:72px!important;height:32px!important;background:#eff6ff!important;border:1px solid #bfdbfe!important;border-radius:8px!important;padding:0!important;cursor:pointer!important;color:#2563eb!important;-webkit-text-fill-color:#2563eb!important;font-size:0!important;font-weight:700!important;line-height:1!important;font-family:inherit!important;text-indent:0!important;opacity:1!important;visibility:visible!important;white-space:nowrap!important;overflow:visible!important;}' +
		'.aksrt-dl-modal__copy::before,.aksrt-dl-modal__copy::after{content:none!important;display:none!important;}' +
		'.aksrt-dl-modal__copy:hover{background:#dbeafe!important;border-color:#93c5fd!important;color:#1d4ed8!important;-webkit-text-fill-color:#1d4ed8!important;}' +
		'.aksrt-dl-modal__copy-text{display:inline-flex!important;align-items:center!important;justify-content:center!important;position:relative!important;z-index:2!important;color:#2563eb!important;-webkit-text-fill-color:#2563eb!important;font-size:13px!important;font-weight:700!important;line-height:1!important;font-family:inherit!important;text-indent:0!important;opacity:1!important;visibility:visible!important;white-space:nowrap!important;}' +
		'.aksrt-dl-modal__copy:hover .aksrt-dl-modal__copy-text{color:#1d4ed8!important;-webkit-text-fill-color:#1d4ed8!important;}' +
		'.aksrt-dl-modal__actions{display:flex;align-items:center;gap:12px;padding-top:4px;flex-wrap:wrap;}' +
		'.aksrt-dl-modal__download{min-height:40px;padding:0 18px;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;text-decoration:none;border:0;cursor:pointer;}' +
		'.aksrt-dl-modal__balance{font-size:13px;color:#6b7280;margin-left:auto;white-space:nowrap;}' +
		'.aksrt-cashier__product{margin:0 0 12px;font-size:14px;line-height:1.5;}' +
		'.aksrt-cashier__tag{display:inline-block;margin-right:8px;padding:2px 8px;border-radius:6px;background:#eff6ff;color:#1d4ed8;font-size:12px;font-weight:700;}' +
		'.aksrt-cashier__box{background:#f8fafc;border:1px solid #e5e7eb;border-radius:10px;padding:10px 12px;margin:0 0 12px;}' +
		'.aksrt-cashier__row{display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:13px;color:#6b7280;padding:4px 0;}' +
		'.aksrt-cashier__row b{color:#111827;font-size:15px;}' +
		'.aksrt-cashier__row b.is-sale{color:#dc2626;}' +
		'.aksrt-cashier__row b.is-ok{color:#059669;}' +
		'.aksrt-cashier__warn{background:#fef2f2;color:#b91c1c;border-radius:8px;padding:10px 12px;margin:0 0 12px;font-size:13px;}' +
		'.aksrt-cashier__methods{margin:0 0 14px;}' +
		'.aksrt-cashier__methods-title{font-size:13px;font-weight:600;color:#374151;margin:0 0 8px;}' +
		'.aksrt-cashier__method{display:flex;align-items:center;gap:8px;padding:8px 10px;border:1px solid #e5e7eb;border-radius:8px;margin:0 0 6px;cursor:pointer;font-size:13px;}' +
		'.aksrt-cashier__coupon{margin:0 0 14px;}' +
		'.aksrt-cashier__coupon-row{display:flex;gap:8px;align-items:center;}' +
		'.aksrt-cashier__coupon-input{flex:1;min-width:0;padding:8px 10px;border:1px solid #e5e7eb;border-radius:8px;font-size:13px;}' +
		'.aksrt-cashier__coupon-desc{margin-top:6px;font-size:12px;color:#9ca3af;line-height:1.5;}' +
		'.aksrt-cashier__coupon-ok{margin-top:6px;font-size:12px;color:#059669;}' +
		'.resource-download-box__attrs{list-style:none;margin:10px 0 0;padding:0;display:grid;gap:6px;}' +
		'.resource-download-box__attrs-item{display:flex;justify-content:space-between;gap:12px;font-size:12px;color:#6b7280;}' +
		'.resource-download-box__attrs-name{flex:0 0 auto;}' +
		'.resource-download-box__attrs-value{color:#111827;text-align:right;}' +
		'.resource-download-box__paid-badge{background:#ecfdf5!important;color:#047857!important;}.resource-download-box__paid-meta{display:grid;gap:4px;margin:8px 0 12px;padding:10px 12px;background:#f0fdf4;border:1px solid #bbf7d0;border-radius:10px;font-size:12px;color:#166534;}' +
		'@media(max-width:480px){.aksrt-dl-modal__panel{padding:24px 20px 22px;}.aksrt-dl-modal__row{grid-template-columns:1fr 72px;gap:8px 12px;}.aksrt-dl-modal__label{grid-column:1 / -1;}.aksrt-dl-modal__code{font-size:17px;}.aksrt-dl-modal__actions{align-items:flex-start;flex-direction:column;}.aksrt-dl-modal__download{width:100%;}.aksrt-dl-modal__balance{margin-left:0;}}' +
		'body.aksrt-dl-modal-open{overflow:hidden;}';
	document.head.appendChild(style);
})();