import {z} from 'zod'

export type JSONPrimitive = string | number | number | boolean | null;

export type JSONValueInput = JSONPrimitive | Array<JSONValueInput> | {[key: string]: JSONValueInput};

export type Conversation = {id: string};

export type Prompt = {id: string, variables?: ({[key: string]: unknown} | null) | undefined, version?: (string | null) | undefined};

export type ResponsesToolChoice = 'none' | 'auto' | 'required' | {[key: string]: JSONValueInput};

export type CreateResponseRequest = {background?: boolean | undefined, context_management?: (Array<{[key: string]: JSONValueInput}> | null) | undefined, conversation?: (string | Conversation | null) | undefined, include?: (Array<unknown> | null) | undefined, input?: (string | Array<unknown> | null) | undefined, instructions?: (string | null) | undefined, max_output_tokens?: (number | null) | undefined, max_tool_calls?: (number | null) | undefined, metadata?: ({[key: string]: unknown} | null) | undefined, model?: (string | null) | undefined, moderation?: ({[key: string]: JSONValueInput} | null) | undefined, parallel_tool_calls?: (boolean | null) | undefined, previous_response_id?: (string | null) | undefined, prompt?: (Prompt | null) | undefined, prompt_cache_key?: (string | null) | undefined, prompt_cache_options?: ({[key: string]: JSONValueInput} | null) | undefined, prompt_cache_retention?: ('in_memory' | 'in-memory' | '24h' | null) | undefined, reasoning?: ({[key: string]: unknown} | null) | undefined, safety_identifier?: (string | null) | undefined, service_tier?: ('auto' | 'default' | 'flex' | 'scale' | 'priority' | null) | undefined, store?: (boolean | null) | undefined, stream?: (boolean | null) | undefined, stream_options: unknown, temperature?: (number | null) | undefined, text: unknown, tool_choice?: ResponsesToolChoice | undefined, tools?: (Array<unknown> | null) | undefined, top_logprobs?: (number | null) | undefined, top_p?: (number | null) | undefined, truncation?: ('auto' | 'disabled' | null) | undefined, user?: (string | null) | undefined, monitor_details?: (boolean | null) | undefined, policy_id?: (string | null) | undefined};

export type CreateApiCygnalResponsesArgs = {body: CreateResponseRequest};

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

export const jSONPrimitive = z.union([z.string(), z.number().int(), z.number(), z.boolean()]).nullable();

export const jSONValueOutput: z.ZodType<JSONValueOutput> = z.union([jSONPrimitive, z.array(z.lazy(() => jSONValueOutput)), z.record(z.string(), z.lazy(() => jSONValueOutput))]);

export const responseMessage = z.object({role: z.string().nullable().optional(), content: z.string().nullable().optional()}).and(z.record(z.string(), z.unknown()));

export const responseChoice = z.object({index: z.number().int().nullable().optional(), finish_reason: z.string().nullable().optional(), message: responseMessage.nullable().optional()}).and(z.record(z.string(), z.unknown()));

export const responseUsage = z.object({prompt_tokens: z.number().int().nullable().optional(), completion_tokens: z.number().int().nullable().optional(), total_tokens: z.number().int().nullable().optional(), input_tokens: z.number().int().nullable().optional(), output_tokens: z.number().int().nullable().optional()}).and(z.record(z.string(), z.unknown()));

export const responseError = z.object({message: z.string().nullable().optional(), type: z.string().nullable().optional(), code: z.string().nullable().optional(), param: z.string().nullable().optional()}).and(z.record(z.string(), z.unknown()));

export const responsesEndpointResponse = z.object({id: z.string().nullable().optional(), object: z.string().nullable().optional(), model: z.string().nullable().optional(), output: z.array(jSONValueOutput).nullable().optional(), choices: z.array(responseChoice).nullable().optional(), usage: responseUsage.nullable().optional(), error: responseError.nullable().optional()}).and(z.record(z.string(), z.unknown()));

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
};

/**
 * Cygnal Responses
 * 
 * POST /cygnal/responses
 */
export const createApiCygnalResponses = async (args: CreateApiCygnalResponsesArgs, options?: CreateApiCygnalResponsesOptions) => {
const {baseUrl = "https://api.grayswan.ai", fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/cygnal/responses${query.size > 0 ? `?${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(responsesEndpointResponse, await res.json())
};