'use client'

/**
 * ChatImagePreviewModal — full-screen-ish preview + download for chat images.
 *
 * Purpose
 * - Opens from `MessageBubble`; uses ConsumerModal. Download URL resolution
 *   stays local (guess filename / trusted upload URL).
 */

import Image from 'next/image'
import { useState } from 'react'

import ConsumerButton from '@/components/consumer/ConsumerButton'
import CloseIcon from '@/components/icons/CloseIcon'
import CloudDownloadIcon from '@/components/icons/CloudDownloadIcon'
import ConsumerModal from '@/components/consumer/ConsumerModal'
import { withBasePath } from '@/constants/images'
import { texts } from '@/texts'
import { addToast } from '@/lib/toast'

interface ChatImagePreviewModalProps {
  imageUrl: string | null
  isOpen: boolean
  onOpenChange: (open: boolean) => void
}

const guessFileName = (imageUrl: string) => {
  try {
    const pathname = new URL(imageUrl, window.location.origin).pathname
    const base = pathname.split('/').filter(Boolean).at(-1)

    if (base && /\.[a-z0-9]{2,5}$/i.test(base)) return decodeURIComponent(base)
  } catch {
    // ignore invalid URL
  }

  return `chat-image-${Date.now()}.jpg`
}

const resolveDownloadUrl = (imageUrl: string) => {
  try {
    const target = new URL(imageUrl, window.location.origin)

    if (target.origin === window.location.origin) return target.toString()
  } catch {
    return imageUrl
  }

  // Cross-origin file hosts (e.g. ghabilee.ir from localhost) often omit CORS
  // for /uploads — proxy through Next so the browser sees a same-origin blob.
  return `${withBasePath('/api/download-upload')}?url=${encodeURIComponent(imageUrl)}`
}

const ChatImagePreviewModal = ({ imageUrl, isOpen, onOpenChange }: ChatImagePreviewModalProps) => {
  const [isDownloading, setIsDownloading] = useState(false)

  const handleDownload = async () => {
    if (!imageUrl || isDownloading) return
    setIsDownloading(true)

    try {
      const response = await fetch(resolveDownloadUrl(imageUrl))

      if (!response.ok) throw new Error('download failed')

      const blob = await response.blob()
      const objectUrl = URL.createObjectURL(blob)
      const anchor = document.createElement('a')

      anchor.href = objectUrl
      anchor.download = guessFileName(imageUrl)
      document.body.appendChild(anchor)
      anchor.click()
      anchor.remove()
      URL.revokeObjectURL(objectUrl)
    } catch {
      window.open(imageUrl, '_blank', 'noopener,noreferrer')
      addToast({ title: texts.chats.downloadFallbackToast, color: 'warning' })
    } finally {
      setIsDownloading(false)
    }
  }

  return (
    <ConsumerModal
      hideCloseButton
      hideFooter
      hideHeader
      backdrop="blur"
      bodyClassName="!p-0"
      className="!max-h-[95dvh] border-0 bg-transparent p-0 shadow-none"
      containerClassName="bg-transparent"
      isOpen={isOpen}
      onOpenChange={onOpenChange}
    >
      <div className="relative flex min-h-[40vh] flex-col rounded-t-2xl bg-white">
        <div className="absolute inset-x-0 top-0 z-10 flex items-center justify-between gap-2 p-3">
          <ConsumerButton
            iconOnly
            aria-label={texts.common.close}
            className="min-h-11 min-w-11 bg-consumer-surface-muted text-consumer-text hover:bg-consumer-surface-muted/80"
            fill="none"
            size="sm"
            onClick={() => {
              onOpenChange(false)
            }}
          >
            <CloseIcon className="size-5" />
          </ConsumerButton>
          <ConsumerButton
            aria-label={texts.chats.downloadImageAria}
            className="min-h-11 min-w-11 bg-consumer-surface-muted text-consumer-text hover:bg-consumer-surface-muted/80"
            fill="none"
            iconStart={!isDownloading ? <CloudDownloadIcon className="size-4" /> : undefined}
            isLoading={isDownloading}
            onClick={() => void handleDownload()}
          >
            {texts.chats.download}
          </ConsumerButton>
        </div>

        <div className="relative min-h-[40vh] w-full flex-1">
          {imageUrl ? (
            <Image
              fill
              alt={texts.chats.chatAttachmentAlt}
              className="object-contain p-3 pt-14"
              sizes="100vw"
              src={imageUrl}
            />
          ) : null}
        </div>
      </div>
    </ConsumerModal>
  )
}

export default ChatImagePreviewModal