import { OA_BASE, IM_HTTP } from './config.js'
import { toast } from './format.js'

export function fileId(file) {
  if (file == null) return ''
  if (typeof file === 'string' || typeof file === 'number') {
    const s = String(file)
    return !s || s === '0' || s === 'null' ? '' : s
  }
  const id = file.id ?? file.fileId
  if (id == null || id === '' || id === 0 || id === '0' || id === 'null') return ''
  return String(id)
}

export function fileName(file, fallback = '附件') {
  if (!file || typeof file !== 'object') return fallback
  return String(file.name || file.fileName || file.originalName || fallback)
}

export function isImageFile(file) {
  const name = fileName(file, '')
  const type = String((file && file.contentType) || '').toLowerCase()
  return type.startsWith('image/') || /\.(png|jpe?g|gif|webp|bmp|heic)$/i.test(name)
}

function unwrapUpload(body) {
  if (!body || typeof body !== 'object') return body
  if (body.code != null && body.code !== 0 && body.code !== 200) {
    throw new Error(body.message || '上传失败')
  }
  return Object.prototype.hasOwnProperty.call(body, 'data') ? body.data : body
}

export function uploadLocal(filePath, token, { kind = 'attach', name } = {}) {
  const urls = [`${OA_BASE}/api/files`, `${IM_HTTP}/api/im/oa/files`]
  const send = (url) => new Promise((resolve, reject) => {
    uni.uploadFile({
      url,
      filePath,
      name: 'file',
      formData: { kind, ...(kind === 'im' || kind === 'IM' ? { bizType: 'im' } : {}) },
      header: token ? { Authorization: 'Bearer ' + token } : {},
      timeout: 120000,
      success(res) {
        let body = res.data
        try { body = typeof body === 'string' ? JSON.parse(body) : body } catch (_) {}
        if (res.statusCode >= 400) {
          reject(new Error((body && body.message) || `上传失败 ${res.statusCode}`))
          return
        }
        try {
          const data = unwrapUpload(body)
          const id = fileId(data)
          if (!id) throw new Error((body && body.message) || '上传未返回文件')
          resolve({
            id,
            name: (data && data.name) || name || '附件',
            size: (data && data.size) || 0,
            contentType: (data && data.contentType) || ''
          })
        } catch (e) {
          reject(e)
        }
      },
      fail(e) {
        reject(new Error((e && e.errMsg) || '上传失败'))
      }
    })
  })
  return send(urls[0]).catch(() => send(urls[1]))
}

export function fileTicket(id, token) {
  return new Promise((resolve, reject) => {
    const urls = [`${OA_BASE}/api/files/${id}/ticket`, `${IM_HTTP}/api/im/oa/files/${id}/ticket`]
    const post = (url, next) => {
      uni.request({
        url,
        method: 'POST',
        header: {
          Accept: 'application/json',
          ...(token ? { Authorization: 'Bearer ' + token } : {})
        },
        success(res) {
          const body = res.data
          if (res.statusCode >= 400) {
            if (next) return next()
            reject(new Error((body && body.message) || '无法预览'))
            return
          }
          const data = body && body.data !== undefined ? body.data : body
          if (data && data.url) {
            resolve(data)
            return
          }
          if (next) return next()
          reject(new Error('无法预览'))
        },
        fail() {
          if (next) next()
          else reject(new Error('无法预览'))
        }
      })
    }
    post(urls[0], () => post(urls[1], null))
  })
}

export async function openFile(file, token) {
  const id = fileId(file)
  if (!id) {
    toast('文件未迁移或无法预览')
    return
  }
  try {
    uni.showLoading({ title: '打开附件…', mask: true })
    const ticket = await fileTicket(id, token)
    const url = ticket.url
    uni.hideLoading()
    if (isImageFile(file)) {
      uni.previewImage({ urls: [url], current: url })
      return
    }
    uni.downloadFile({
      url,
      header: token ? { Authorization: 'Bearer ' + token } : {},
      success(res) {
        if (res.statusCode === 200 && res.tempFilePath) {
          uni.openDocument({
            filePath: res.tempFilePath,
            showMenu: true,
            fail() {
              plus.runtime.openURL(url)
            }
          })
        } else {
          toast('下载失败')
        }
      },
      fail() {
        try { plus.runtime.openURL(url) } catch (_) { toast('无法打开附件') }
      }
    })
  } catch (e) {
    uni.hideLoading()
    toast((e && e.message) || '无法预览附件')
  }
}

function uploadPaths(paths, token, kind) {
  return Promise.all(paths.map((p) => uploadLocal(p, token, { kind })))
}

export function pickAndUpload(token, kind = 'attach') {
  return new Promise((resolve, reject) => {
    const fromImages = () => {
      uni.chooseImage({
        count: 6,
        sizeType: ['compressed', 'original'],
        sourceType: ['album', 'camera'],
        success(res) {
          const paths = res.tempFilePaths || []
          if (!paths.length) return resolve([])
          uni.showLoading({ title: '上传中…', mask: true })
          uploadPaths(paths, token, kind)
            .then((rows) => { uni.hideLoading(); resolve(rows) })
            .catch((e) => { uni.hideLoading(); reject(e) })
        },
        fail() { resolve([]) }
      })
    }
    const fromFiles = () => {
      const chooser = typeof uni.chooseFile === 'function' ? uni.chooseFile : null
      if (!chooser) return fromImages()
      chooser({
        count: 6,
        type: 'all',
        extension: ['.jpg', '.jpeg', '.png', '.gif', '.webp', '.pdf', '.doc', '.docx', '.xls', '.xlsx'],
        success(res) {
          const files = res.tempFiles || []
          const paths = files.map((f) => f.path || f.tempFilePath).filter(Boolean)
          if (!paths.length) return resolve([])
          uni.showLoading({ title: '上传中…', mask: true })
          uploadPaths(paths, token, kind)
            .then((rows) => { uni.hideLoading(); resolve(rows) })
            .catch((e) => { uni.hideLoading(); reject(e) })
        },
        fail() { resolve([]) }
      })
    }
    uni.showActionSheet({
      itemList: ['拍照或相册', '选择文件'],
      success(res) {
        if (res.tapIndex === 0) fromImages()
        else fromFiles()
      },
      fail() { resolve([]) }
    })
  })
}

export function collectFiles(row) {
  const out = []
  const seen = new Set()
  const push = (f) => {
    if (!f) return
    const id = fileId(f)
    const key = id || fileName(f)
    if (!key || seen.has(key)) return
    seen.add(key)
    out.push(typeof f === 'object' ? f : { id })
  }
  const walk = (v) => {
    if (!v) return
    if (Array.isArray(v)) v.forEach(walk)
    else if (typeof v === 'object') {
      if (fileId(v) || v.name) push(v)
    }
  }
  if (!row || typeof row !== 'object') return out
  walk(row.files)
  walk(row.attachments)
  walk(row.invoiceFiles)
  walk(row.receiptFiles)
  const form = row.form && typeof row.form === 'object' ? row.form : row
  walk(form.files)
  walk(form.attachments)
  ;(form.invoices || row.invoices || []).forEach((inv) => walk(inv && inv.files))
  return out
}