import {z} from 'zod'

export type ChatMessage = {role: string, content: string, name?: (string | null) | undefined, tool_calls?: (Array<{[key: string]: unknown}> | null) | undefined};

export type ChatCompletionRequest = {model: string, messages: Array<ChatMessage>, temperature?: (number | null) | undefined, top_p?: (number | null) | undefined, n?: (number | null) | undefined, stream?: (boolean | null) | undefined, stop?: (string | Array<string> | null) | undefined, max_tokens?: (number | null) | undefined, presence_penalty?: (number | null) | undefined, frequency_penalty?: (number | null) | undefined, logit_bias?: ({[key: string]: number} | null) | undefined, user?: (string | null) | undefined};

export type CreateApiApiV1ArbitersChatCompletionsArgs = {authorization?: (string | null) | undefined, modaic_session?: (string | null) | undefined, body: ChatCompletionRequest};

export type CreateApiApiV1ArbitersChatCompletionsOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const chatMessage = z.object({role: z.string(), content: z.string(), name: z.string().nullable().optional(), tool_calls: z.array(z.record(z.string(), z.unknown())).nullable().optional()});

export const chatCompletionChoice = z.object({index: z.number().int(), message: chatMessage, finish_reason: z.string().nullable().optional()});

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

export const chatCompletionResponse = z.object({id: z.string().optional(), object: z.string().optional(), created: z.number().int().optional(), model: z.string(), choices: z.array(chatCompletionChoice), usage: completionUsage, system_fingerprint: z.string().nullable().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
};

/**
 * Create Chat Completion
 * 
 * POST /api/v1/arbiters/chat/completions
 */
export const createApiApiV1ArbitersChatCompletions = async (args: CreateApiApiV1ArbitersChatCompletionsArgs, options: CreateApiApiV1ArbitersChatCompletionsOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args.authorization != null) headers.set("authorization", String(args.authorization))
if (args.modaic_session != null) cookies.push("modaic_session=" + encodeURIComponent(String(args.modaic_session)))
if (cookies.length > 0) headers.set('cookie', cookies.join('; '))

const url = `${baseUrl.replace(/\/+$/, '')}/api/v1/arbiters/chat/completions${query.size > 0 ? `?${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(chatCompletionResponse, await res.json())
};