/**
 * 小程序拍照凭证上传（OpenSpec 基线）
 * chooseImage → uni.uploadFile → 收集 URL → 业务接口再传 imageUrls
 */
import { API_BASE, TOKEN_KEY, UPLOAD_API } from '@/config/api'

function parseUploadBody(raw) {
  try {
    return JSON.parse(typeof raw === 'string' ? raw : String(raw || ''))
  } catch {
    return {}
  }
}

function extractUrl(body) {
  const data = body && body.data
  if (!data || typeof data !== 'object') return ''
  const url = data.url || data.fileUrl || data.file_url
  return url != null ? String(url).trim() : ''
}

function getToken() {
  const raw = uni.getStorageSync(TOKEN_KEY)
  return typeof raw === 'string' ? raw.trim() : raw ? String(raw).trim() : ''
}

/**
 * @param {{ folder?: string, maxCount?: number, currentUrls?: string[], uploadUrl?: string }} opts
 * @returns {Promise<string[]>} 本次新上传成功的 URL 列表
 */
export async function chooseAndUploadImages(opts = {}) {
  const folder = opts.folder || 'mini-evidence'
  const maxCount = opts.maxCount != null ? opts.maxCount : 6
  const currentUrls = Array.isArray(opts.currentUrls) ? opts.currentUrls : []
  const uploadUrl = opts.uploadUrl || `${API_BASE}${UPLOAD_API.IMAGE}`
  const remain = maxCount - currentUrls.length

  if (remain <= 0) {
    uni.showToast({ title: `最多上传${maxCount}张`, icon: 'none' })
    return []
  }

  const choose = await new Promise((resolve) => {
    uni.chooseImage({
      count: remain,
      sizeType: ['compressed'],
      sourceType: ['album', 'camera'],
      success: (res) => resolve(res),
      fail: () => resolve(null)
    })
  })
  if (!choose?.tempFilePaths?.length) return []

  const token = getToken()
  const urls = []
  uni.showLoading({ title: '上传中...' })
  try {
    for (const filePath of choose.tempFilePaths) {
      const uploadRes = await new Promise((ok, fail) => {
        uni.uploadFile({
          url: uploadUrl,
          filePath,
          name: 'file',
          header: {
            Authorization: token ? `Bearer ${token}` : ''
          },
          formData: { folder },
          success: ok,
          fail
        })
      })
      if (uploadRes.statusCode === 401) {
        uni.showToast({ title: '登录已失效，请重新登录', icon: 'none' })
        break
      }
      const body = parseUploadBody(uploadRes.data)
      const url = extractUrl(body)
      if (body.code !== 200 || !url) {
        uni.showToast({ title: body.message || '上传失败', icon: 'none' })
        break
      }
      urls.push(url)
    }
  } catch (e) {
    uni.showToast({
      title: e instanceof Error ? e.message : '上传失败',
      icon: 'none'
    })
  } finally {
    uni.hideLoading()
  }
  return urls
}

export function previewImages(urls, current) {
  const list = (urls || []).map((u) => String(u || '').trim()).filter(Boolean)
  if (!list.length) return
  uni.previewImage({
    urls: list,
    current: current || list[0]
  })
}