import {z} from 'zod'

export type Message = {role: 'system' | 'user' | 'assistant', content: string};

export type ChatCompletionReq = {model: 'MiniMax-M1' | 'MiniMax-Text-01', messages: Array<Message>, temperature?: number | undefined, max_tokens?: number | undefined, stream?: boolean | undefined, top_p?: number | undefined};

export type CreateApiV1TextChatcompletionV2Args = {body: ChatCompletionReq};

export type CreateApiV1TextChatcompletionV2Options = {baseUrl?: string | undefined, bearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const message = z.object({role: z.enum(["system", "user", "assistant"]), content: z.string()});

export const choice = z.object({index: z.number().int().optional(), message: message.optional(), finish_reason: z.enum(["stop", "length", "content_filter"]).optional()});

export const usage = z.object({prompt_tokens: z.number().int().optional(), completion_tokens: z.number().int().optional(), total_tokens: z.number().int().optional()});

export const chatCompletionResp = z.object({id: z.string().optional(), object: z.literal("chat.completion").optional(), created: z.number().int().optional(), model: z.string().optional(), choices: z.array(choice).optional(), usage: usage.optional()});

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
};

/**
 * Text Generation V2
 * 
 * POST /v1/text/chatcompletion_v2
 */
export const createApiV1TextChatcompletionV2 = async (args: CreateApiV1TextChatcompletionV2Args, options?: CreateApiV1TextChatcompletionV2Options) => {
const {baseUrl = "https://api.minimax.io", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/v1/text/chatcompletion_v2${query.size > 0 ? `?${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(chatCompletionResp, await res.json())
};