/**
 * FormCreate 运行时补丁：
 * - 内置 upload 默认 action 为「/」，会 POST 到前端原点导致 404；接管为附件上传 API
 * - 运行时注册 FcRow（flex ._fd-row），间距与铺满由 oa-fc-runtime.scss 处理
 * - 覆盖内置 upload：picture-card 下非图片用文档/视频图标展示，避免破图
 */
import { ElMessage } from 'element-plus'
import { fetchUploadAttachment } from '@/api/business'
import { attachmentFullUrl } from '@/composables/useAttachmentActions'
import OaFcRow from '@/components/oa-approval/OaFcRow.vue'
import OaFcUpload from '@/components/oa-approval/OaFcUpload.vue'

type FcFetchOptions = {
  source?: string
  file?: File
  filename?: string
  data?: Record<string, unknown>
  action?: string
  onSuccess?: (res: unknown) => void
  onError?: (err: unknown) => void
  [key: string]: unknown
}

const FLAG = '__oaUploadConfigured'

const UPLOAD_TYPES = new Set(['upload', 'fcUpload'])

/** 与业务表单 `.form-grid-2` 横向间距对齐（顶层 option.row.gutter / CSS --oa-fc-gutter） */
export const OA_FC_DEFAULT_GUTTER = 20

/** 从上传接口响应中取出可回显的 url（兼容 FormCreate 默认 onSuccess） */
export function resolveUploadResponseUrl(res: any): string {
  const raw = String(
    res?.data?.url || res?.data?.fileUrl || res?.fileUrl || res?.url || ''
  ).trim()
  if (!raw) return ''
  return attachmentFullUrl(raw) || raw
}

function ensureUploadRule(rule: any) {
  if (!UPLOAD_TYPES.has(String(rule.type || ''))) return
  const props = { ...(rule.props || {}) }
  if (!props.action || props.action === '/') {
    props.action = '#'
  }
  const prevSuccess = props.onSuccess
  // `$FNX:...` 须留给 FormCreate 编译；替换成函数会丢掉官方 file.url = res.data.url
  if (typeof prevSuccess === 'string' && prevSuccess.includes('$FNX')) {
    // keep
  } else if (typeof prevSuccess === 'function') {
    props.onSuccess = (res: any, file: any) => {
      try {
        prevSuccess(res, file)
      } catch {
        /* ignore */
      }
      const url = resolveUploadResponseUrl(res)
      // Element Plus 选文件时已写入 blob: URL，必须强制覆盖
      if (url && file) {
        file.url = url
      }
    }
  } else if (!prevSuccess) {
    props.onSuccess = (res: any, file: any) => {
      const url = resolveUploadResponseUrl(res)
      if (url && file) {
        file.url = url
      }
    }
  }
  rule.props = props
}

/**
 * 运行时补齐 FormCreate rule（upload action / onSuccess）
 */
export function ensureOaUploadRuleProps(rules: unknown): any[] {
  if (!Array.isArray(rules)) return []
  return rules.map((raw) => {
    if (!raw || typeof raw !== 'object') return raw
    const rule: any = { ...(raw as object) }
    ensureUploadRule(rule)
    if (Array.isArray(rule.children)) {
      rule.children = ensureOaUploadRuleProps(rule.children)
    }
    if (Array.isArray(rule.props?.rule)) {
      rule.props = {
        ...rule.props,
        rule: ensureOaUploadRuleProps(rule.props.rule)
      }
    }
    if (Array.isArray(rule.control)) {
      rule.control = rule.control.map((c: any) => {
        if (!c || typeof c !== 'object') return c
        if (Array.isArray(c.rule)) {
          return { ...c, rule: ensureOaUploadRuleProps(c.rule) }
        }
        return c
      })
    }
    return rule
  })
}

export function setupFormCreateUpload(formCreate: {
  fetch?: (opts: FcFetchOptions) => void
  component?: (name: string, component: unknown) => void
}) {
  if (!formCreate || (formCreate as any)[FLAG]) return

  // 主应用 formCreate 默认未挂设计器 FcRow；用 flex 行保证栅格铺满，间距走 CSS
  if (typeof formCreate.component === 'function') {
    formCreate.component('fcRow', OaFcRow)
    formCreate.component('FcRow', OaFcRow)
    // 覆盖默认 fcUpload：非图片不再走 <img> 破图
    formCreate.component('upload', OaFcUpload)
    formCreate.component('fcUpload', OaFcUpload)
  }

  const prevFetch = formCreate.fetch

  formCreate.fetch = (options: FcFetchOptions) => {
    const isUpload = options?.source === 'upload' || !!options?.file
    if (!isUpload) {
      if (typeof prevFetch === 'function') {
        return prevFetch(options)
      }
      return
    }

    void (async () => {
      try {
        const file = options.file
        if (!file) {
          throw new Error('未选择文件')
        }
        const fd = new FormData()
        fd.append('file', file)
        fd.append('folder', 'oa-approval')
        const extra = options.data
        if (extra && typeof extra === 'object') {
          Object.entries(extra).forEach(([k, v]) => {
            if (v != null && k !== 'file' && k !== 'folder') {
              fd.append(k, String(v))
            }
          })
        }
        const res: any = await fetchUploadAttachment(fd)
        const rawUrl = String(res?.fileUrl || res?.data?.fileUrl || '').trim()
        if (!rawUrl) {
          throw new Error('上传失败：未返回文件地址')
        }
        // 预览用完整 URL；设计器默认 onSuccess 为 file.url = res.data.url
        const url = attachmentFullUrl(rawUrl) || rawUrl
        options.onSuccess?.({
          data: { url, fileUrl: rawUrl },
          fileUrl: rawUrl,
          url
        })
      } catch (e) {
        const msg = e instanceof Error ? e.message : '上传失败'
        ElMessage.error(msg)
        options.onError?.(e)
      }
    })()
  }

  ;(formCreate as any)[FLAG] = true
}