/**
 * CRM 附件解析与下载 — 门户 MinIO（fileUrl 即存储键/URL，不再走 CRM /resource/oss/listByIds）
 */
import {
  downloadAttachmentFile,
  openAttachmentPreviewInNewTab
} from '@/utils/download-attachment'

export type CrmAttachmentRef = {
  ossId: string
  category?: string
}

export type CrmAttachmentFile = {
  ossId: string
  name: string
  url: string
  category?: string
}

/** 解析 attachmentFiles 字段（JSON 数组或逗号分隔 URL） */
export function parseCrmAttachmentField(
  fileStr: string | null | undefined
): CrmAttachmentRef[] {
  const raw = (fileStr || '').trim()
  if (!raw) return []

  if (raw.startsWith('[')) {
    try {
      const parsed = JSON.parse(raw)
      if (Array.isArray(parsed)) {
        return parsed.map((item: unknown) => {
          if (typeof item === 'string') {
            return { ossId: item, category: 'other' }
          }
          const obj = item as Record<string, unknown>
          return {
            ossId: String(obj.ossId || obj.url || ''),
            category: (obj.category as string) || 'other'
          }
        }).filter((a) => a.ossId)
      }
    } catch {
      // fall through
    }
  }

  return raw
    .split(',')
    .map((s) => s.trim())
    .filter(Boolean)
    .map((ossId) => ({ ossId, category: 'other' }))
}

/** 从 ossId/url 推导展示文件名（完整 URL 与相对路径均取最后一段） */
export function crmAttachmentDisplayName(ossId: string, index = 0): string {
  const id = (ossId || '').trim()
  if (!id) return `附件${index + 1}`

  // 含路径分隔符时取末段（兼容 http(s) URL 与 MinIO 相对键如 crm/contract/.../uuid.pdf）
  if (id.includes('/')) {
    const seg = (id.split('/').pop() || '').split('?')[0]
    try {
      return decodeURIComponent(seg) || `附件${index + 1}`
    } catch {
      return seg || `附件${index + 1}`
    }
  }

  if (id.length > 12) return `附件_${id.substring(0, 8)}`
  return id
}

/** 将解析结果转为 UI 文件项（门户直接存 MinIO URL，无需 listByIds） */
export function resolveCrmAttachmentFiles(
  refs: CrmAttachmentRef[]
): CrmAttachmentFile[] {
  return refs.map((att, index) => {
    const ossId = att.ossId
    return {
      ossId,
      name: crmAttachmentDisplayName(ossId, index),
      url: ossId,
      category: att.category || 'other'
    }
  })
}

/** 兼容旧 loadAttachmentInfos：批量解析并写入 cache Map */
export function fillAttachmentInfoCache(
  ossIds: string[],
  cache: Map<string, { name: string; url: string }>
): void {
  ossIds.forEach((id, index) => {
    const key = (id || '').trim()
    if (!key || cache.has(key)) return
    cache.set(key, {
      name: crmAttachmentDisplayName(key, index),
      url: key
    })
  })
}

export type ContractAttachmentItem = {
  uid: string
  name: string
  ossId?: string
  url?: string
  localPreview?: string
  status: 'uploading' | 'success' | 'error'
  category: 'single_seal' | 'double_seal' | 'other'
}

/** 合同附件列表 → 保存 API 用的 JSON 字符串 */
export function serializeContractAttachments(items: ContractAttachmentItem[]): string {
  const payload = items
    .filter((file) => file.status === 'success' && file.ossId)
    .map((file) => ({
      ossId: String(file.ossId),
      category: file.category || 'other'
    }))
  return payload.length ? JSON.stringify(payload) : ''
}

/** 合同附件列表 → uploadAttachments 接口 payload */
export function mapContractAttachmentsPayload(items: ContractAttachmentItem[]) {
  return items
    .filter((file) => file.status === 'success' && file.ossId)
    .map((file) => ({
      ossId: String(file.ossId),
      category: file.category || 'other'
    }))
}

/** MinIO 相对路径 → 浏览器可访问 URL */
export function resolveCrmAttachmentUrl(fileUrl: string): string {
  const trimmed = String(fileUrl || '').trim()
  if (!trimmed) return ''
  if (/^https?:\/\//i.test(trimmed)) return trimmed
  const base = String(import.meta.env.VITE_MINIO_BASE_URL || '').replace(/\/$/, '')
  return base ? `${base}/${trimmed.replace(/^\//, '')}` : trimmed
}

export function isCrmImageFile(file: { name?: string; url?: string; ossId?: string }): boolean {
  const name = file.name || ''
  if (/\.(jpg|jpeg|png|gif|bmp|webp)$/i.test(name)) return true
  const src = file.url || file.ossId || ''
  return /\.(jpg|jpeg|png|gif|bmp|webp)(\?|$)/i.test(src)
}

export function isCrmPdfFile(file: { name?: string; url?: string; ossId?: string }): boolean {
  const name = file.name || ''
  if (/\.pdf$/i.test(name)) return true
  const src = file.url || file.ossId || ''
  return /\.pdf(\?|$)/i.test(src)
}

export function getCrmFileExt(fileName: string): string {
  const ext = fileName.split('.').pop()?.toUpperCase()
  return ext || 'FILE'
}

const CRM_ATTACHMENT_CATEGORY_LABELS: Record<string, string> = {
  single_seal: '单章附件',
  double_seal: '双章附件',
  other: '其他附件'
}

/** 附件分类 → 展示文案 */
export function getCrmAttachmentCategoryLabel(category?: string): string {
  return CRM_ATTACHMENT_CATEGORY_LABELS[category || 'other'] || CRM_ATTACHMENT_CATEGORY_LABELS.other
}

/** 下载 CRM 附件（fileUrl / ossId 均为 MinIO 路径或完整 URL） */
export async function downloadCrmAttachment(file: {
  ossId?: string
  url?: string
  name?: string
  fileName?: string
}) {
  const fileUrl = String(file.url || file.ossId || '').trim()
  if (!fileUrl) return
  const fileName = String(file.fileName || file.name || '').trim() || crmAttachmentDisplayName(fileUrl)
  await downloadAttachmentFile({ fileUrl, fileName }, { fullFileUrl: resolveCrmAttachmentUrl })
}

/** CRM 附件在新标签页预览（图片 HTML 内嵌 / PDF 预签名直开） */
export async function openCrmAttachmentPreviewInNewTab(file: {
  ossId?: string
  url?: string
  name?: string
  fileName?: string
}) {
  const fileUrl = String(file.url || file.ossId || '').trim()
  if (!fileUrl) return false
  const fileName =
    String(file.fileName || file.name || '').trim() || crmAttachmentDisplayName(fileUrl)
  const kind = isCrmImageFile({ name: fileName, url: fileUrl, ossId: fileUrl })
    ? 'image'
    : isCrmPdfFile({ name: fileName, url: fileUrl, ossId: fileUrl })
      ? 'pdf'
      : 'other'
  return openAttachmentPreviewInNewTab(
    { fileUrl, fileName },
    { fullFileUrl: resolveCrmAttachmentUrl, kind }
  )
}

/** el-upload 回显：从 attachmentFiles 字符串构建 file-list */
export function buildUploadFileListFromField(
  fileStr: string | null | undefined
): Array<Record<string, unknown>> {
  const refs = parseCrmAttachmentField(fileStr)
  return refs.map((att, index) => ({
    uid: `existing_${index}_${Date.now()}`,
    name: crmAttachmentDisplayName(att.ossId, index),
    url: att.ossId,
    ossId: att.ossId,
    category: att.category || 'other',
    status: 'success'
  }))
}

/** 从 el-upload file-list 收集 attachmentFiles JSON（供保存 API） */
export function serializeUploadAttachments(
  files: Array<{ status?: string; ossId?: string; url?: string; category?: string }>
): string {
  const items = files
    .filter((f) => f.status === 'success' && (f.ossId || f.url))
    .map((f) => ({
      ossId: String(f.ossId || f.url),
      category: f.category || 'other'
    }))
  return items.length ? JSON.stringify(items) : ''
}