import {z} from 'zod'

export type AiGeneratePromptRequest = {model: '2.7B' | '6B-v4' | 'euterpe-v2' | 'genji-python-6b' | 'genji-jp-6b' | 'genji-jp-6b-v2' | 'krake-v2' | 'hypebot' | 'infillmodel' | 'cassandra' | 'sigurd-2.9b-v1' | 'blue' | 'red' | 'green' | 'purple' | 'clio-v1' | 'kayra-v1', prompt: string, temp: number, tokens_to_generate: number};

export type CreateApiAiGeneratePromptArgs = {body: AiGeneratePromptRequest};

export type CreateApiAiGeneratePromptOptions = {baseUrl: string, bearer?: string | undefined, fetch?: typeof fetch | undefined};

export const aiGeneratePromptResponse = z.object({generated_text: z.string()});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * POST /ai/generate-prompt
 */
export const createApiAiGeneratePrompt = async (args: CreateApiAiGeneratePromptArgs, options: CreateApiAiGeneratePromptOptions) => {
const {baseUrl, fetch: fetchFn = fetch, bearer} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('content-type', "application/json")
headers.set('accept', "application/json")

if (bearer !== undefined) headers.set('authorization', `Bearer ${bearer}`)

const url = `${baseUrl.replace(/\/+$/, '')}/ai/generate-prompt${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(aiGeneratePromptResponse, await res.json())
};