import axios from 'axios'
import { ref } from 'vue'

export function useDownload() {
  const isDownloading = ref(false)

  const downloadFile = async (
    url: string,
    filename?: string,
    token?: string,
    headers?: Record<string, string>,
  ): Promise<void> => {
    if (isDownloading.value) return

    try {
      isDownloading.value = true

      // Build headers
      const requestHeaders: Record<string, string> = { ...headers }
      if (token && !requestHeaders.Authorization) {
        requestHeaders.Authorization = `Bearer ${token}`
      }

      // Use direct axios call with headers
      const response = await axios.get(url, {
        responseType: 'blob',
        ...(Object.keys(requestHeaders).length > 0 && { headers: requestHeaders }),
      })

      const blob = new Blob([response.data], { type: response.data.type })
      const blobUrl = URL.createObjectURL(blob)

      // Extract filename from Content-Disposition header or use provided/default
      let finalFilename = filename
      const contentDisposition = response.headers['content-disposition'] || response.headers['Content-Disposition']

      if (contentDisposition) {
        try {
          const utf8Match = contentDisposition.match(/filename\*=UTF-8''([^;]+)/i)
          const basicMatch = contentDisposition.match(/filename="?([^";]+)"?/i)
          const rawFilename = utf8Match?.[1] ?? basicMatch?.[1]
          if (rawFilename) {
            finalFilename = decodeURIComponent(rawFilename.replace(/\+/g, '%20'))
          }
        } catch {
          // Fallback if parsing fails
        }
      }

      if (!finalFilename) {
        finalFilename = url.substring(url.lastIndexOf('/') + 1) || 'download'
      }

      // Create and trigger download
      const link = document.createElement('a')
      link.href = blobUrl
      link.download = finalFilename
      document.body.appendChild(link)
      link.click()

      // Cleanup
      setTimeout(() => {
        document.body.removeChild(link)
        URL.revokeObjectURL(blobUrl)
      }, 100)
    } catch (error) {
      console.error('Download failed:', error)
      throw error
    } finally {
      isDownloading.value = false
    }
  }

  return {
    downloadFile,
    isDownloading,
  }
}