import API from './API'

class Descriptions {
  private static instance: Descriptions | null = null
  private descriptions: Record<string, any> = {}
  private modelDescriptions: Record<string, any> = {}
  private loaded: boolean = false
  private loadingPromise: Promise<void> | null = null

  private constructor() {}

  static getInstance(): Descriptions {
    if (!Descriptions.instance) {
      Descriptions.instance = new Descriptions()
    }
    return Descriptions.instance
  }

  async load(): Promise<void> {
    if (this.loaded) return
    if (this.loadingPromise) return this.loadingPromise
    this.loadingPromise = API.fetchDescriptions().then((data) => {
      this.descriptions = data.descriptions || {}
      this.modelDescriptions = data.model_descriptions || {}
      this.loaded = true
    })
    return this.loadingPromise
  }

  getFullName(name: string): string | undefined {
    return this.descriptions[name]?.full_name
  }

  getDescription(name: string): string | undefined {
    return this.descriptions[name]?.description
  }

  getUrl(name: string): string | undefined {
    return this.descriptions[name]?.link
  }

  getModelDescription(name: string): string | undefined {
    return this.modelDescriptions[name]?.description
  }

  getModelFullName(name: string): string | undefined {
    return this.modelDescriptions[name]?.full_name
  }

  getModelPaperUrl(name: string): string | undefined {
    return this.modelDescriptions[name]?.paper_link
  }

  getModelGithubUrl(name: string): string | undefined {
    return this.modelDescriptions[name]?.github_link
  }
}

export default Descriptions