import type {
  Model,
  ModelItem,
} from '@/app/components/header/account-setting/model-provider-page/declarations'
import type { RetrievalConfig } from '@/types/app'
import { describe, expect, it } from 'vitest'
import {
  ConfigurationMethodEnum,
  ModelStatusEnum,
  ModelTypeEnum,
} from '@/app/components/header/account-setting/model-provider-page/declarations'
import { RerankingModeEnum } from '@/models/datasets'
import { RETRIEVE_METHOD } from '@/types/app'
import { isReRankModelSelected } from '../check-rerank-model'

// Test data factory
const createRetrievalConfig = (overrides: Partial<RetrievalConfig> = {}): RetrievalConfig => ({
  search_method: RETRIEVE_METHOD.semantic,
  reranking_enable: false,
  reranking_model: {
    reranking_provider_name: '',
    reranking_model_name: '',
  },
  top_k: 3,
  score_threshold_enabled: false,
  score_threshold: 0.5,
  ...overrides,
})

const createModelItem = (model: string): ModelItem => ({
  model,
  label: { en_US: model, zh_Hans: model },
  model_type: ModelTypeEnum.rerank,
  fetch_from: ConfigurationMethodEnum.predefinedModel,
  status: ModelStatusEnum.active,
  model_properties: {},
  load_balancing_enabled: false,
})

const createRerankModelList = (): Model[] => [
  {
    provider: 'openai',
    icon_small: { en_US: '', zh_Hans: '' },
    label: { en_US: 'OpenAI', zh_Hans: 'OpenAI' },
    models: [createModelItem('gpt-4-turbo'), createModelItem('gpt-3.5-turbo')],
    status: ModelStatusEnum.active,
  },
  {
    provider: 'cohere',
    icon_small: { en_US: '', zh_Hans: '' },
    label: { en_US: 'Cohere', zh_Hans: 'Cohere' },
    models: [createModelItem('rerank-english-v2.0'), createModelItem('rerank-multilingual-v2.0')],
    status: ModelStatusEnum.active,
  },
]

describe('check-rerank-model', () => {
  describe('isReRankModelSelected', () => {
    describe('Core Functionality', () => {
      it('should return true when reranking is disabled', () => {
        const config = createRetrievalConfig({
          reranking_enable: false,
        })

        const result = isReRankModelSelected({
          retrievalConfig: config,
          rerankModelList: createRerankModelList(),
          indexMethod: 'high_quality',
        })

        expect(result).toBe(true)
      })

      it('should return true for economy indexMethod', () => {
        const config = createRetrievalConfig({
          search_method: RETRIEVE_METHOD.semantic,
          reranking_enable: true,
        })

        const result = isReRankModelSelected({
          retrievalConfig: config,
          rerankModelList: createRerankModelList(),
          indexMethod: 'economy',
        })

        expect(result).toBe(true)
      })

      it('should return true when model is selected and valid', () => {
        const config = createRetrievalConfig({
          search_method: RETRIEVE_METHOD.semantic,
          reranking_enable: true,
          reranking_model: {
            reranking_provider_name: 'cohere',
            reranking_model_name: 'rerank-english-v2.0',
          },
        })

        const result = isReRankModelSelected({
          retrievalConfig: config,
          rerankModelList: createRerankModelList(),
          indexMethod: 'high_quality',
        })

        expect(result).toBe(true)
      })
    })

    describe('Edge Cases', () => {
      it('should return false when reranking enabled but no model selected for semantic search', () => {
        const config = createRetrievalConfig({
          search_method: RETRIEVE_METHOD.semantic,
          reranking_enable: true,
          reranking_model: {
            reranking_provider_name: '',
            reranking_model_name: '',
          },
        })

        const result = isReRankModelSelected({
          retrievalConfig: config,
          rerankModelList: createRerankModelList(),
          indexMethod: 'high_quality',
        })

        expect(result).toBe(false)
      })

      it('should return false when reranking enabled but no model selected for fullText search', () => {
        const config = createRetrievalConfig({
          search_method: RETRIEVE_METHOD.fullText,
          reranking_enable: true,
          reranking_model: {
            reranking_provider_name: '',
            reranking_model_name: '',
          },
        })

        const result = isReRankModelSelected({
          retrievalConfig: config,
          rerankModelList: createRerankModelList(),
          indexMethod: 'high_quality',
        })

        expect(result).toBe(false)
      })

      it('should return false for hybrid search without WeightedScore mode and no model selected', () => {
        const config = createRetrievalConfig({
          search_method: RETRIEVE_METHOD.hybrid,
          reranking_enable: true,
          reranking_mode: RerankingModeEnum.RerankingModel,
          reranking_model: {
            reranking_provider_name: '',
            reranking_model_name: '',
          },
        })

        const result = isReRankModelSelected({
          retrievalConfig: config,
          rerankModelList: createRerankModelList(),
          indexMethod: 'high_quality',
        })

        expect(result).toBe(false)
      })

      it('should return true for hybrid search with WeightedScore mode even without model', () => {
        const config = createRetrievalConfig({
          search_method: RETRIEVE_METHOD.hybrid,
          reranking_enable: true,
          reranking_mode: RerankingModeEnum.WeightedScore,
          reranking_model: {
            reranking_provider_name: '',
            reranking_model_name: '',
          },
        })

        const result = isReRankModelSelected({
          retrievalConfig: config,
          rerankModelList: createRerankModelList(),
          indexMethod: 'high_quality',
        })

        expect(result).toBe(true)
      })

      it('should return false when provider exists but model not found', () => {
        const config = createRetrievalConfig({
          search_method: RETRIEVE_METHOD.semantic,
          reranking_enable: true,
          reranking_model: {
            reranking_provider_name: 'cohere',
            reranking_model_name: 'non-existent-model',
          },
        })

        const result = isReRankModelSelected({
          retrievalConfig: config,
          rerankModelList: createRerankModelList(),
          indexMethod: 'high_quality',
        })

        expect(result).toBe(false)
      })

      it('should return false when provider not found in list', () => {
        const config = createRetrievalConfig({
          search_method: RETRIEVE_METHOD.semantic,
          reranking_enable: true,
          reranking_model: {
            reranking_provider_name: 'non-existent-provider',
            reranking_model_name: 'some-model',
          },
        })

        const result = isReRankModelSelected({
          retrievalConfig: config,
          rerankModelList: createRerankModelList(),
          indexMethod: 'high_quality',
        })

        expect(result).toBe(false)
      })

      it('should return true with empty rerankModelList when reranking disabled', () => {
        const config = createRetrievalConfig({
          reranking_enable: false,
        })

        const result = isReRankModelSelected({
          retrievalConfig: config,
          rerankModelList: [],
          indexMethod: 'high_quality',
        })

        expect(result).toBe(true)
      })

      it('should return true when indexMethod is undefined', () => {
        const config = createRetrievalConfig({
          search_method: RETRIEVE_METHOD.semantic,
          reranking_enable: true,
        })

        const result = isReRankModelSelected({
          retrievalConfig: config,
          rerankModelList: createRerankModelList(),
          indexMethod: undefined,
        })

        expect(result).toBe(true)
      })
    })
  })
})