import type { TFunction } from 'i18next'
import type { KnowledgeBaseNodeType } from './types'
import { IndexingType } from '@/app/components/datasets/create/step-two'
import { ModelStatusEnum } from '@/app/components/header/account-setting/model-provider-page/declarations'
import { RetrievalSearchMethodEnum } from './types'

export const isHighQualitySearchMethod = (searchMethod: RetrievalSearchMethodEnum) => {
  return (
    searchMethod === RetrievalSearchMethodEnum.semantic ||
    searchMethod === RetrievalSearchMethodEnum.hybrid ||
    searchMethod === RetrievalSearchMethodEnum.fullText
  )
}

export enum KnowledgeBaseValidationIssueCode {
  chunkStructureRequired = 'chunk-structure-required',
  chunksVariableRequired = 'chunks-variable-required',
  indexMethodRequired = 'index-method-required',
  embeddingModelNotConfigured = 'embedding-model-not-configured',
  embeddingModelConfigureRequired = 'embedding-model-configure-required',
  embeddingModelApiKeyUnavailable = 'embedding-model-api-key-unavailable',
  embeddingModelCreditsExhausted = 'embedding-model-credits-exhausted',
  embeddingModelDisabled = 'embedding-model-disabled',
  embeddingModelIncompatible = 'embedding-model-incompatible',
  retrievalSettingRequired = 'retrieval-setting-required',
  rerankingModelRequired = 'reranking-model-required',
  rerankingModelInvalid = 'reranking-model-invalid',
}

type KnowledgeBaseValidationIssue = {
  code: KnowledgeBaseValidationIssueCode
}

type KnowledgeBaseValidationPayload = Pick<
  KnowledgeBaseNodeType,
  | 'chunk_structure'
  | 'index_chunk_variable_selector'
  | 'indexing_technique'
  | 'embedding_model'
  | 'embedding_model_provider'
  | '_embeddingModelList'
  | '_embeddingProviderModelList'
  | '_rerankModelList'
> & {
  retrieval_model?: Pick<
    KnowledgeBaseNodeType['retrieval_model'],
    'search_method' | 'reranking_enable' | 'reranking_model'
  >
}

const resolveIssue = (code: KnowledgeBaseValidationIssueCode): KnowledgeBaseValidationIssue => ({
  code,
})

const resolveEmbeddingIssue = (
  payload: KnowledgeBaseValidationPayload,
): KnowledgeBaseValidationIssue | null => {
  const {
    embedding_model,
    embedding_model_provider,
    _embeddingModelList,
    _embeddingProviderModelList,
  } = payload

  if (!embedding_model || !embedding_model_provider)
    return resolveIssue(KnowledgeBaseValidationIssueCode.embeddingModelNotConfigured)

  const currentEmbeddingModelProvider = _embeddingModelList?.find(
    (provider) => provider.provider === embedding_model_provider,
  )
  const hasProviderScopedModelList =
    !!_embeddingProviderModelList && _embeddingProviderModelList.length > 0
  const embeddingModelCandidates = hasProviderScopedModelList
    ? _embeddingProviderModelList
    : currentEmbeddingModelProvider?.models
  const currentEmbeddingModel = embeddingModelCandidates?.find(
    (model) => model.model === embedding_model,
  )

  if (!currentEmbeddingModel) {
    if (!currentEmbeddingModelProvider)
      return resolveIssue(KnowledgeBaseValidationIssueCode.embeddingModelIncompatible)

    const providerExists = hasProviderScopedModelList || currentEmbeddingModelProvider
    return resolveIssue(
      providerExists
        ? KnowledgeBaseValidationIssueCode.embeddingModelIncompatible
        : KnowledgeBaseValidationIssueCode.embeddingModelNotConfigured,
    )
  }

  switch (currentEmbeddingModel.status) {
    case ModelStatusEnum.active:
      return null
    case ModelStatusEnum.noConfigure:
      return resolveIssue(KnowledgeBaseValidationIssueCode.embeddingModelConfigureRequired)
    case ModelStatusEnum.credentialRemoved:
      return resolveIssue(KnowledgeBaseValidationIssueCode.embeddingModelApiKeyUnavailable)
    case ModelStatusEnum.quotaExceeded:
      return resolveIssue(KnowledgeBaseValidationIssueCode.embeddingModelCreditsExhausted)
    case ModelStatusEnum.disabled:
      return resolveIssue(KnowledgeBaseValidationIssueCode.embeddingModelDisabled)
    case ModelStatusEnum.noPermission:
    default:
      return resolveIssue(KnowledgeBaseValidationIssueCode.embeddingModelIncompatible)
  }
}

export const getKnowledgeBaseValidationIssue = (
  payload: KnowledgeBaseValidationPayload,
): KnowledgeBaseValidationIssue | null => {
  const {
    chunk_structure,
    indexing_technique,
    retrieval_model,
    index_chunk_variable_selector,
    _rerankModelList,
  } = payload

  const { search_method, reranking_enable, reranking_model } = retrieval_model || {}

  if (!chunk_structure) return resolveIssue(KnowledgeBaseValidationIssueCode.chunkStructureRequired)

  if (index_chunk_variable_selector.length === 0)
    return resolveIssue(KnowledgeBaseValidationIssueCode.chunksVariableRequired)

  if (!indexing_technique) return resolveIssue(KnowledgeBaseValidationIssueCode.indexMethodRequired)

  if (indexing_technique === IndexingType.QUALIFIED) {
    const embeddingIssue = resolveEmbeddingIssue(payload)
    if (embeddingIssue) return embeddingIssue
  }

  if (!retrieval_model || !search_method)
    return resolveIssue(KnowledgeBaseValidationIssueCode.retrievalSettingRequired)

  if (reranking_enable) {
    if (
      !reranking_model ||
      !reranking_model.reranking_provider_name ||
      !reranking_model.reranking_model_name
    )
      return resolveIssue(KnowledgeBaseValidationIssueCode.rerankingModelRequired)

    const currentRerankingModelProvider = _rerankModelList?.find(
      (provider) => provider.provider === reranking_model.reranking_provider_name,
    )
    const currentRerankingModel = currentRerankingModelProvider?.models.find(
      (model) => model.model === reranking_model.reranking_model_name,
    )
    if (!currentRerankingModel)
      return resolveIssue(KnowledgeBaseValidationIssueCode.rerankingModelInvalid)
  }

  return null
}

export const getKnowledgeBaseValidationMessage = (
  issue: KnowledgeBaseValidationIssue | null | undefined,
  t: TFunction,
) => {
  if (!issue) return ''

  switch (issue.code) {
    case KnowledgeBaseValidationIssueCode.chunkStructureRequired:
      return t(($) => $['nodes.knowledgeBase.chunkIsRequired'], { ns: 'workflow' })
    case KnowledgeBaseValidationIssueCode.chunksVariableRequired:
      return t(($) => $['nodes.knowledgeBase.chunksVariableIsRequired'], { ns: 'workflow' })
    case KnowledgeBaseValidationIssueCode.indexMethodRequired:
      return t(($) => $['nodes.knowledgeBase.indexMethodIsRequired'], { ns: 'workflow' })
    case KnowledgeBaseValidationIssueCode.embeddingModelNotConfigured:
      return t(($) => $['nodes.knowledgeBase.embeddingModelNotConfigured'], { ns: 'workflow' })
    case KnowledgeBaseValidationIssueCode.embeddingModelConfigureRequired:
      return t(($) => $['modelProvider.selector.configureRequired'], { ns: 'common' })
    case KnowledgeBaseValidationIssueCode.embeddingModelApiKeyUnavailable:
      return t(($) => $['modelProvider.selector.apiKeyUnavailable'], { ns: 'common' })
    case KnowledgeBaseValidationIssueCode.embeddingModelCreditsExhausted:
      return t(($) => $['modelProvider.selector.creditsExhausted'], { ns: 'common' })
    case KnowledgeBaseValidationIssueCode.embeddingModelDisabled:
      return t(($) => $['modelProvider.selector.disabled'], { ns: 'common' })
    case KnowledgeBaseValidationIssueCode.embeddingModelIncompatible:
      return t(($) => $['modelProvider.selector.incompatible'], { ns: 'common' })
    case KnowledgeBaseValidationIssueCode.retrievalSettingRequired:
      return t(($) => $['nodes.knowledgeBase.retrievalSettingIsRequired'], { ns: 'workflow' })
    case KnowledgeBaseValidationIssueCode.rerankingModelRequired:
      return t(($) => $['nodes.knowledgeBase.rerankingModelIsRequired'], { ns: 'workflow' })
    case KnowledgeBaseValidationIssueCode.rerankingModelInvalid:
      return t(($) => $['nodes.knowledgeBase.rerankingModelIsInvalid'], { ns: 'workflow' })
    default:
      return ''
  }
}