import {z} from 'zod'

export type ResponsesInputMessage = {role: 'system' | 'user' | 'assistant' | 'developer' | 'tool', content: string | Array<{type?: string | undefined, text?: string | undefined, image_url?: string | undefined}>};

export type ReasoningConfig = {effort?: string | undefined, summary?: ('none' | 'auto' | 'detailed') | undefined};

export type ToolDefinition = {type: 'function', function: {name?: string | undefined, description?: string | undefined, parameters?: Record<string, never> | undefined}};

export type ResponsesRequest = {model: string, input: string | Array<ResponsesInputMessage>, max_output_tokens?: number | undefined, temperature?: number | undefined, stream?: boolean | undefined, reasoning?: ReasoningConfig | undefined, tools?: Array<ToolDefinition> | undefined, tool_choice?: ('auto' | 'none' | 'required' | Record<string, never>) | undefined, metadata?: {[key: string]: unknown} | undefined, user?: string | undefined, include?: Array<string> | undefined, top_logprobs?: number | undefined};

export type CreateApiModelsV2OpenaiV1ResponsesArgs = {Authorization: string, body: ResponsesRequest};

export type CreateApiModelsV2OpenaiV1ResponsesOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const responsesOutputTextItem = z.object({type: z.literal("output_text").optional(), text: z.string().optional()});

export const responsesMessageItem = z.object({type: z.literal("message"), role: z.string(), content: z.array(responsesOutputTextItem)});

export const responsesReasoningItem = z.object({type: z.literal("reasoning").optional(), summary: z.array(z.object({type: z.literal("summary_text").optional(), text: z.string().optional()})).optional()});

export const responsesResponse = z.object({id: z.string(), object: z.string(), created: z.number().int(), model: z.string(), output: z.array(z.union([responsesMessageItem, responsesReasoningItem])).optional(), output_text: z.string().optional(), usage: z.record(z.string(), z.unknown()).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
};

/**
 * Responses
 * 
 * POST /models/v2/openai/v1/responses
 */
export const createApiModelsV2OpenaiV1Responses = async (args: CreateApiModelsV2OpenaiV1ResponsesArgs, options?: CreateApiModelsV2OpenaiV1ResponsesOptions) => {
const {baseUrl = "https://api.bytez.com", fetch: fetchFn = fetch} = options ?? {}

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

if (args.Authorization != null) headers.set("Authorization", String(args.Authorization))

const url = `${baseUrl.replace(/\/+$/, '')}/models/v2/openai/v1/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(responsesResponse, await res.json())
};