import {z} from 'zod'

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

export type FunctionDefinition = {name: string, description?: string | undefined, parameters?: {[key: string]: unknown} | undefined};

export type ChatCompletionToolParam = {type: 'function', function: FunctionDefinition};

export type BucketIds = {bucket_ids: Array<string>, max_num_results?: number | undefined};

export type Retrieval = {type: 'retrieval', retrieval: BucketIds};

export type ResponseFormatText = {type: 'text'};

export type ResponseFormatJsonObject = {type: 'json_object'};

export type ResponseFormatJsonSchema = {name: string, description?: string | undefined, schema?: {[key: string]: unknown} | undefined, strict?: boolean | undefined};

export type ResponseFormatJsonSchemaParam = {type: 'json_schema', json_schema: ResponseFormatJsonSchema};

export type ChatCompletionResponseFormatParam = ResponseFormatText | ResponseFormatJsonObject | ResponseFormatJsonSchemaParam;

export type ChatCompletionRequest = {messages: Array<ChatCompletionSystemMessageParam>, model?: string | undefined, service_tier?: string | undefined, region?: ('USA' | 'EU' | 'AUS' | 'UAE') | undefined, mode?: ('preferred' | 'strict') | undefined, api_key_ref?: string | undefined, stream?: boolean | undefined, temperature?: number | undefined, max_tokens?: (number | null) | undefined, tools?: (Array<ChatCompletionToolParam | Retrieval>) | undefined, tool_choice?: ('none' | 'auto' | 'required') | undefined, response_format?: ChatCompletionResponseFormatParam | undefined, min_p?: number | undefined, n?: number | undefined, use_beam_search?: boolean | undefined, best_of?: number | undefined, length_penalty?: number | undefined, early_stopping?: boolean | undefined, logprobs?: boolean | undefined, top_logprobs?: number | undefined, frequency_penalty?: number | undefined, presence_penalty?: number | undefined, top_p?: number | undefined, stop?: (string | Array<string>) | undefined, seed?: number | undefined, enable_thinking?: boolean | undefined, reasoning_effort?: ('none' | 'minimal' | 'low' | 'medium' | 'high' | 'xhigh' | 'max') | undefined};

export type CreateApiAiChatCompletionsArgs = {body: ChatCompletionRequest};

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

export const createApiAiChatCompletionsResponse = 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
};

/**
 * Create a chat completion
 * 
 * POST /ai/chat/completions
 */
export const createApiAiChatCompletions = async (args: CreateApiAiChatCompletionsArgs, options?: CreateApiAiChatCompletionsOptions) => {
const {baseUrl = "https://api.telnyx.com/v2", 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 = `${baseUrl.replace(/\/+$/, '')}/ai/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(createApiAiChatCompletionsResponse, await res.json())
};