/**
 * 统一请求封装：baseURL、Bearer Token、业务 code 处理。
 * 接口地址统一从 .env 的 VITE_API_BASE_URL 读取（见 api/config.js）。
 */
import { getToken, logout, isSSOEnabled, getRefreshToken, setAuthTokens } from '@/utils/auth.js'
import { resolveBaseURL, getBaseURL } from '@/api/config.js'

export { getBaseURL }

function buildFullUrl(url) {
	return resolveBaseURL().replace(/\/$/, '') + url
}

/**
 * 用 refresh_token 换取新的访问令牌（独立封装，避免与 request 递归调用）。
 * 仅在统一认证模式（VITE_AUTH_MODE=sso）下使用。
 */
function refreshAccessToken() {
	return new Promise((resolve, reject) => {
		const refresh = getRefreshToken()
		if (!refresh) {
			reject(new Error('无刷新令牌'))
			return
		}
		uni.request({
			url: buildFullUrl('/auth/token'),
			method: 'POST',
			header: { 'Content-Type': 'application/x-www-form-urlencoded' },
			data: `grant_type=refresh_token&refresh_token=${encodeURIComponent(refresh)}&client_id=yz-uniapp`,
			timeout: 10000,
			success(res) {
				const body = res.data || {}
				if (res.statusCode === 200 && body.access_token) {
					setAuthTokens(body)
					resolve(body.access_token)
				} else {
					reject(new Error((body && (body.error || body.msg)) || '刷新失败'))
				}
			},
			fail: reject
		})
	})
}

/** 续期后重放原请求，返回与 request 一致的 data 解包结果 */
async function replayRequest(options) {
	const token = await refreshAccessToken()
	const res = await new Promise((resolve, reject) => {
		uni.request({
			url: buildFullUrl(options.url),
			method: (options.method || 'GET').toUpperCase(),
			data: options.data || {},
			header: Object.assign(
				{ 'Content-Type': 'application/json', Authorization: `Bearer ${token}` },
				options.header || {}
			),
			timeout: options.timeout || 30000,
			success: (r) => resolve(r.data || {}),
			fail: reject
		})
	})
	if (typeof res.code !== 'undefined' && res.code !== 200) {
		const err = new Error(res.msg || '操作失败')
		err.code = res.code
		err.response = res
		throw err
	}
	return typeof res.data !== 'undefined' ? res.data : res
}

/**
 * @param {{ url: string, method?: string, data?: object, header?: object, silent?: boolean }} options
 * @returns {Promise<any>} 业务 data 字段（若无 data 则返回整包）
 */
export function request(options = {}) {
	const { url, method = 'GET', data, header = {}, silent = false, timeout = 30000 } = options
	const token = getToken()
	const headers = {
		'Content-Type': 'application/json',
		...header
	}
	if (token) {
		headers.Authorization = `Bearer ${token}`
	}

	const fullUrl = buildFullUrl(url)

	return new Promise((resolve, reject) => {
		uni.request({
			url: fullUrl,
			method: method.toUpperCase(),
			data: data || {},
			header: headers,
			timeout,
			async success(res) {
				const status = res.statusCode
				const body = res.data || {}

				if (status === 401 || body.code === 401) {
					// 统一认证模式：先用 refresh_token 静默续期并重放请求，
					// 续期失败（令牌过期/被吊销/被踢下线）才真正登出。
					if (isSSOEnabled()) {
						try {
							resolve(await replayRequest(options))
							return
						} catch (e) {
							// 续期失败，继续走下面的登出流程
						}
					}
					logout()
					if (!silent) {
						uni.showToast({ title: body.msg || '请重新登录', icon: 'none' })
					}
					setTimeout(() => {
						uni.reLaunch({ url: '/pages/login/login' })
					}, 400)
					reject(new Error(body.msg || '未授权'))
					return
				}

				if (status < 200 || status >= 300) {
					const msg = body.msg || `请求失败(${status})`
					if (!silent) uni.showToast({ title: msg, icon: 'none' })
					reject(new Error(msg))
					return
				}

				// 统一后端 { code, msg, data }
				if (typeof body.code !== 'undefined' && body.code !== 200) {
					const msg = body.msg || '操作失败'
					if (!silent) uni.showToast({ title: msg, icon: 'none' })
					const err = new Error(msg)
					err.code = body.code
					err.response = body
					reject(err)
					return
				}

				resolve(typeof body.data !== 'undefined' ? body.data : body)
			},
			fail(err) {
				const detail = (err && err.errMsg) || ''
				console.error('[request fail]', fullUrl, detail)
				if (!silent) {
					uni.showToast({
						title: detail.includes('timeout') ? '请求超时' : '网络异常，请检查接口地址',
						icon: 'none'
					})
				}
				reject(new Error(detail || '网络异常'))
			}
		})
	})
}

/** 返回完整响应体（含 code/msg），用于需要自行判断 code 的场景 */
export function requestRaw(options = {}) {
	const { url, method = 'GET', data, header = {} } = options
	const token = getToken()
	const headers = {
		'Content-Type': 'application/json',
		...header
	}
	if (token) {
		headers.Authorization = `Bearer ${token}`
	}

	const fullUrl = buildFullUrl(url)

	return new Promise((resolve, reject) => {
		uni.request({
			url: fullUrl,
			method: method.toUpperCase(),
			data: data || {},
			header: headers,
			timeout: 30000,
			success(res) {
				resolve(res.data || {})
			},
			fail(err) {
				console.error('[requestRaw fail]', fullUrl, err)
				reject(err)
			}
		})
	})
}

export function generateId() {
	return `${Date.now().toString(36)}${Math.random().toString(36).slice(2, 8)}`
}