import type { FC } from 'react'
import type { FullDocumentDetail } from '@/models/datasets'
import type { RETRIEVE_METHOD } from '@/types/app'
import { buttonVariants } from '@langgenius/dify-ui/button'
import { cn } from '@langgenius/dify-ui/cn'
import { RiArrowRightLine, RiLoader2Fill, RiTerminalBoxLine } from '@remixicon/react'
import { useMemo } from 'react'
import { useTranslation } from 'react-i18next'
import Divider from '@/app/components/base/divider'
import VectorSpaceAdmissionAlert from '@/app/components/datasets/common/vector-space-admission-alert'
import { useProviderContext } from '@/context/provider-context'
import { useDatasetApiAccessUrl } from '@/hooks/use-api-access-url'
import Link from '@/next/link'
import { useProcessRule } from '@/service/knowledge/use-dataset'
import { useInvalidDocumentList } from '@/service/knowledge/use-document'
import IndexingProgressItem from './indexing-progress-item'
import RuleDetail from './rule-detail'
import UpgradeBanner from './upgrade-banner'
import { useIndexingStatusPolling } from './use-indexing-status-polling'
import { createDocumentLookup } from './utils'

type EmbeddingProcessProps = {
  datasetId: string
  batchId: string
  documents?: FullDocumentDetail[]
  indexingType?: string
  retrievalMethod?: RETRIEVE_METHOD
}

// Status header component
const StatusHeader: FC<{ isEmbedding: boolean; isCompleted: boolean }> = ({
  isEmbedding,
  isCompleted,
}) => {
  const { t } = useTranslation()

  return (
    <div className="flex items-center gap-x-1 system-md-semibold-uppercase text-text-secondary">
      {isEmbedding && (
        <>
          <RiLoader2Fill className="size-4 animate-spin" />
          <span>{t(($) => $['embedding.processing'], { ns: 'datasetDocuments' })}</span>
        </>
      )}
      {isCompleted && t(($) => $['embedding.completed'], { ns: 'datasetDocuments' })}
    </div>
  )
}

// Action buttons component
const ActionButtons: FC<{
  apiReferenceUrl: string
  documentsHref: string
  onNavigateToDocuments: () => void
}> = ({ apiReferenceUrl, documentsHref, onNavigateToDocuments }) => {
  const { t } = useTranslation()

  return (
    <div className="mt-6 flex items-center gap-x-2 py-2">
      <Link
        href={apiReferenceUrl}
        target="_blank"
        rel="noopener noreferrer"
        className={cn(buttonVariants(), 'w-fit')}
      >
        <RiTerminalBoxLine className="size-4" />
        <span>Access the API</span>
      </Link>
      <Link
        href={documentsHref}
        className={cn(buttonVariants({ variant: 'primary' }), 'w-fit')}
        onClick={onNavigateToDocuments}
      >
        <span>{t(($) => $['stepThree.navTo'], { ns: 'datasetCreation' })}</span>
        <RiArrowRightLine className="size-4 stroke-current stroke-1" />
      </Link>
    </div>
  )
}

const EmbeddingProcess: FC<EmbeddingProcessProps> = ({
  datasetId,
  batchId,
  documents = [],
  indexingType,
  retrievalMethod,
}) => {
  const { enableBilling, plan } = useProviderContext()
  const invalidDocumentList = useInvalidDocumentList()
  const apiReferenceUrl = useDatasetApiAccessUrl()

  // Polling hook for indexing status
  const { statusList, isEmbedding, isEmbeddingCompleted } = useIndexingStatusPolling({
    datasetId,
    batchId,
  })

  // Get process rule for the first document
  const firstDocumentId = documents[0]?.id
  const { data: ruleDetail } = useProcessRule(firstDocumentId)

  // Document lookup utilities - memoized for performance
  const documentLookup = useMemo(() => createDocumentLookup(documents), [documents])

  const documentsHref = `/datasets/${datasetId}/documents`

  const showUpgradeBanner = enableBilling && plan.type !== 'team'
  const showVectorSpaceUpgrade =
    enableBilling && (plan.type === 'sandbox' || plan.type === 'professional')
  const vectorSpaceAdmissionError = statusList.find(
    (detail) => detail.error_code === 'vector_space_estimate_exceeded',
  )

  return (
    <>
      <div className="flex flex-col gap-y-3">
        <StatusHeader isEmbedding={isEmbedding} isCompleted={isEmbeddingCompleted} />

        {vectorSpaceAdmissionError?.estimated_vector_space_mb != null &&
          vectorSpaceAdmissionError.vector_space_limit_mb != null && (
            <VectorSpaceAdmissionAlert
              showUpgrade={showVectorSpaceUpgrade}
              estimatedMb={vectorSpaceAdmissionError.estimated_vector_space_mb}
              planLimitMb={vectorSpaceAdmissionError.vector_space_limit_mb}
            />
          )}

        {showUpgradeBanner && <UpgradeBanner />}

        <div className="flex flex-col gap-0.5 pb-2">
          {statusList.map((detail) => (
            <IndexingProgressItem
              key={detail.id}
              detail={detail}
              name={documentLookup.getName(detail.id)}
              sourceType={documentLookup.getSourceType(detail.id)}
              notionIcon={documentLookup.getNotionIcon(detail.id)}
              enableBilling={enableBilling}
            />
          ))}
        </div>

        <Divider type="horizontal" className="my-0 bg-divider-subtle" />

        <RuleDetail
          sourceData={ruleDetail}
          indexingType={indexingType}
          retrievalMethod={retrievalMethod}
        />
      </div>

      <ActionButtons
        apiReferenceUrl={apiReferenceUrl}
        documentsHref={documentsHref}
        onNavigateToDocuments={invalidDocumentList}
      />
    </>
  )
}

export default EmbeddingProcess