/**
 * Composable for handling image uploads to S3
 */

import { ref } from 'vue'
import { showToast } from 'vant'
import { uploadApi } from '~/api/upload'

export interface UseImageUploadOptions {
  /**
   * Upload type (1=avatar, 2=identity card, etc.)
   */
  type: number
  /**
   * Max file size in MB
   */
  maxSizeMB?: number
  /**
   * Custom toast messages
   */
  messages?: {
    selectImage?: string
    onlyImage?: string
    tooLarge?: string
    signFailed?: string
    uploadUrlInvalid?: string
    uploadFailed?: string
    uploadSuccess?: string
  }
}

export function useImageUpload(options: UseImageUploadOptions) {
  const { t } = useI18n()
  const uploading = ref(false)

  const defaultMessages = {
    selectImage: t('editProfile.toast.selectImage'),
    onlyImage: t('editProfile.toast.onlyImage'),
    tooLarge: t('editProfile.toast.tooLarge'),
    signFailed: t('editProfile.toast.signFailed'),
    uploadUrlInvalid: t('editProfile.toast.uploadUrlInvalid'),
    uploadFailed: t('editProfile.toast.uploadFailed'),
    uploadSuccess: t('editProfile.toast.uploadSuccess'),
  }

  const messages = { ...defaultMessages, ...options.messages }
  const maxSizeMB = options.maxSizeMB || 5

  /**
   * Upload a file to S3 and return the file URL
   * @param file - The file to upload
   * @returns The uploaded file URL, or null if upload failed
   */
  const uploadFile = async (file: File): Promise<string | null> => {
    // Validate file type
    if (!file.type || !file.type.startsWith('image/')) {
      showToast(messages.onlyImage)
      return null
    }

    // Validate file size
    const isWithinSize = file.size / 1024 / 1024 < maxSizeMB
    if (!isWithinSize) {
      showToast(messages.tooLarge)
      return null
    }

    // Get file suffix
    const dotIndex = file.name.lastIndexOf('.')
    const suffix = dotIndex >= 0 ? file.name.slice(dotIndex + 1) : ''

    try {
      uploading.value = true

      // Get S3 pre-sign info
      const signResult = await uploadApi.getS3PreSign({
        type: options.type,
        suffix,
      })

      if (!signResult) {
        showToast(messages.signFailed)
        return null
      }

      const { preSignUrl, fileUrl } = signResult

      if (!preSignUrl) {
        showToast(messages.uploadUrlInvalid)
        return null
      }

      // Upload to S3 using native fetch PUT
      const res = await fetch(preSignUrl, {
        method: 'PUT',
        headers: {
          'Content-Type': file.type || 'application/octet-stream',
        },
        body: file,
      })

      if (!res.ok) {
        console.error('S3 upload failed with status:', res.status)
        showToast(messages.uploadFailed)
        return null
      }

      // Return the file URL from backend, fallback to pre-signed URL without query params
      const uploadedUrl = fileUrl || preSignUrl.split('?')[0] || ''
      showToast(messages.uploadSuccess)
      return uploadedUrl
    }
    catch (error) {
      console.error('Upload file error:', error)
      showToast(messages.uploadFailed)
      return null
    }
    finally {
      uploading.value = false
    }
  }

  return {
    uploading,
    uploadFile,
  }
}