/**
 * 极验 4.0 — 点击登录后弹出 bind 模式验证码，成功后返回校验参数供登录接口使用。
 */
import { getGeetest4Infos } from '@/api/auth.js'
import { GEETEST4_CAPTCHA_ID } from '@/api/config.js'

// #ifdef H5
import '@/static/js/gt4.js'
// #endif

function normalizeValidate(result, fallbackCaptchaId) {
	return {
		captcha_id: result?.captcha_id || fallbackCaptchaId,
		lot_number: result?.lot_number || '',
		pass_token: result?.pass_token || '',
		gen_time: result?.gen_time || '',
		captcha_output: result?.captcha_output || ''
	}
}

/** 优先读后端配置，失败时使用本地 captcha_id */
export async function fetchGeetest4CaptchaId() {
	try {
		const data = await getGeetest4Infos()
		if (data?.captcha_id) return data.captcha_id
	} catch {
		// 后端未配置或未开启时走本地兜底
	}
	return GEETEST4_CAPTCHA_ID
}

// #ifdef H5
function showGeetest4H5(captchaId) {
	return new Promise((resolve, reject) => {
		if (typeof window === 'undefined' || !window.initGeetest4) {
			reject(new Error('极验 SDK 未加载'))
			return
		}
		let settled = false
		const settle = (fn) => {
			if (settled) return
			settled = true
			fn()
		}
		window.initGeetest4(
			{
				captchaId,
				product: 'bind',
				language: 'zh-CN',
				https: true
			},
			(instance) => {
				const teardown = () => {
					try {
						if (typeof instance.hideCaptcha === 'function') instance.hideCaptcha()
						if (typeof instance.destroy === 'function') instance.destroy()
					} catch {
						// ignore
					}
				}
				instance.onSuccess(() => {
					const result = normalizeValidate(instance.getValidate(), captchaId)
					teardown()
					settle(() => resolve(result))
				})
				instance.onFail(() => {
					teardown()
					settle(() => reject(new Error('人机验证未通过')))
				})
				instance.onError(() => {
					teardown()
					settle(() => reject(new Error('人机验证加载失败')))
				})
				instance.onClose?.(() => {
					setTimeout(() => {
						if (settled) return
						teardown()
						settle(() => reject(new Error('已取消人机验证')))
					}, 400)
				})
				instance.showCaptcha()
			}
		)
	})
}
// #endif

// #ifdef APP-PLUS
function showGeetest4App(captchaId) {
	// 清理可能残留的原生 Webview
	if (typeof plus !== 'undefined' && plus.webview) {
		try {
			const old = plus.webview.getWebviewById('geetest-captcha-overlay')
			if (old) old.close('none')
		} catch (e) {}
	}

	return new Promise((resolve, reject) => {
		uni.navigateTo({
			url: `/pages/login/geetest-webview?captchaId=${encodeURIComponent(captchaId)}`,
			events: {
				geetestSuccess(data) {
					resolve(normalizeValidate(data, captchaId))
				},
				geetestFail(msg) {
					reject(new Error(msg || '人机验证未通过'))
				}
			},
			fail(err) {
				reject(new Error(err?.errMsg || '无法打开验证页面'))
			}
		})
	})
}
// #endif

/**
 * 弹出极验 4.0 验证
 * @returns {Promise<{ captcha_id, lot_number, pass_token, gen_time, captcha_output }>}
 */
export async function showGeetest4() {
	const captchaId = await fetchGeetest4CaptchaId()
	if (!captchaId) {
		throw new Error('未配置极验 captcha_id')
	}

	// #ifdef H5
	return showGeetest4H5(captchaId)
	// #endif

	// #ifdef APP-PLUS
	return showGeetest4App(captchaId)
	// #endif

	// #ifndef H5 || APP-PLUS
	throw new Error('当前平台暂不支持极验验证，请使用 H5 或 App')
	// #endif
}