import ApiService from '@/services/api.service'
import { ExampleRepository, SearchOption } from '@/domain/models/example/exampleRepository'
import { ExampleItem, ExampleItemList } from '@/domain/models/example/example'

function toModel(item: { [key: string]: any }): ExampleItem {
  return new ExampleItem(
    item.id,
    item.text,
    item.meta,
    item.annotation_approver,
    item.comment_count,
    item.filename,
    item.is_confirmed,
    item.upload_name,
    item.assignments
  )
}

function toPayload(item: ExampleItem): { [key: string]: any } {
  return {
    id: item.id,
    text: item.text,
    meta: item.meta,
    annotation_approver: item.annotationApprover,
    comment_count: item.commentCount
  }
}

/**
 * Extracts a parameter value from a query string.
 *
 * @param {string} q - The query string to extract the parameter from.
 * @param {string} name - The name of the parameter to extract.
 * @return {Array} - A tuple containing the updated query string and the extracted parameter value.
 *                  - If the parameter is not found, the extracted value will be null.
 */
function extractParamFromQuery(q: string, name: string): [string, string | null] {
  const pattern = new RegExp(`${name}:(".+?"|\\S+)`)
  if (pattern.test(q)) {
    const value = pattern.exec(q)![1]
    q = q.replace(pattern, '')
    return [q, value]
  }
  return [q, null]
}

function buildQueryParams(
  limit: any,
  offset: string,
  q: string,
  isChecked: string,
  ordering: string
): string {
  const params = new URLSearchParams()
  params.append('limit', limit)
  params.append('offset', offset)
  params.append('confirmed', isChecked)
  params.append('ordering', ordering)

  const customParams = ['label', 'assignee']
  let updatedQuery: string = q
  customParams.forEach((param: string) => {
    let value: string | null
    ;[updatedQuery, value] = extractParamFromQuery(updatedQuery, param)
    if (value !== null) {
      params.append(param, value)
    }
  })

  params.append('q', updatedQuery)
  return params.toString()
}

export class APIExampleRepository implements ExampleRepository {
  constructor(private readonly request = ApiService) {}

  async list(
    projectId: string,
    { limit = '10', offset = '0', q = '', isChecked = '', ordering = '' }: SearchOption
  ): Promise<ExampleItemList> {
    // @ts-ignore
    const params = buildQueryParams(limit, offset, q, isChecked, ordering)
    const url = `/projects/${projectId}/examples?${params}`
    const response = await this.request.get(url)
    return new ExampleItemList(
      response.data.count,
      response.data.next,
      response.data.previous,
      response.data.results.map((item: { [key: string]: any }) => toModel(item))
    )
  }

  async create(projectId: string, item: ExampleItem): Promise<ExampleItem> {
    const url = `/projects/${projectId}/examples`
    const payload = toPayload(item)
    const response = await this.request.post(url, payload)
    return toModel(response.data)
  }

  async update(projectId: string, item: ExampleItem): Promise<ExampleItem> {
    const url = `/projects/${projectId}/examples/${item.id}`
    const payload = toPayload(item)
    const response = await this.request.patch(url, payload)
    return toModel(response.data)
  }

  async bulkDelete(projectId: string, ids: number[]): Promise<void> {
    const url = `/projects/${projectId}/examples`
    await this.request.delete(url, { ids })
  }

  async deleteAll(projectId: string): Promise<void> {
    const url = `/projects/${projectId}/examples`
    await this.request.delete(url)
  }

  async findById(projectId: string, exampleId: number): Promise<ExampleItem> {
    const url = `/projects/${projectId}/examples/${exampleId}`
    const response = await this.request.get(url)
    return toModel(response.data)
  }

  async confirm(projectId: string, exampleId: number): Promise<void> {
    const url = `/projects/${projectId}/examples/${exampleId}/states`
    await this.request.post(url, {})
  }
}