import {z} from 'zod'

export type ChatCompletionContentPartTextParam = {text: string, type: 'text'};

export type ChatCompletionDeveloperMessageParam = {content: string | Array<ChatCompletionContentPartTextParam>, role: 'developer', name?: string | undefined};

export type ChatCompletionSystemMessageParam = {content: string | Array<ChatCompletionContentPartTextParam>, role: 'system', name?: string | undefined};

export type ImageURL = {url: string, detail?: ('auto' | 'low' | 'high') | undefined};

export type ChatCompletionContentPartImageParam = {image_url: ImageURL, type: 'image_url'};

export type InputAudio = {data: string, format: 'wav' | 'mp3'};

export type ChatCompletionContentPartInputAudioParam = {input_audio: InputAudio, type: 'input_audio'};

export type FileFile = {file_data?: string | undefined, file_id?: string | undefined, filename?: string | undefined};

export type File = {file: FileFile, type: 'file'};

export type ChatCompletionUserMessageParam = {content: string | Array<ChatCompletionContentPartTextParam | ChatCompletionContentPartImageParam | ChatCompletionContentPartInputAudioParam | File>, role: 'user', name?: string | undefined};

export type Audio = {id: string};

export type ChatCompletionContentPartRefusalParam = {refusal: string, type: 'refusal'};

export type FunctionCall = {arguments: string, name: string};

export type Function = {arguments: string, name: string};

export type ChatCompletionMessageFunctionToolCallParam = {id: string, function: Function, type: 'function'};

export type Custom = {input: string, name: string};

export type ChatCompletionMessageCustomToolCallParam = {id: string, custom: Custom, type: 'custom'};

export type ChatCompletionAssistantMessageParam = {role: 'assistant', audio?: (Audio | null) | undefined, content?: (string | Array<ChatCompletionContentPartTextParam | ChatCompletionContentPartRefusalParam> | null) | undefined, function_call?: (FunctionCall | null) | undefined, name?: string | undefined, refusal?: (string | null) | undefined, tool_calls?: (Array<ChatCompletionMessageFunctionToolCallParam | ChatCompletionMessageCustomToolCallParam>) | undefined};

export type ChatCompletionToolMessageParam = {content: string | Array<ChatCompletionContentPartTextParam>, role: 'tool', tool_call_id: string};

export type ChatCompletionFunctionMessageParam = {content: string | null, name: string, role: 'function'};

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

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

export type ChatCompletionRequest = {model: string, messages: Array<ChatCompletionDeveloperMessageParam | ChatCompletionSystemMessageParam | ChatCompletionUserMessageParam | ChatCompletionAssistantMessageParam | ChatCompletionToolMessageParam | ChatCompletionFunctionMessageParam>, temperature?: (number | null) | undefined, top_p?: (number | null) | undefined, max_tokens?: (number | null) | undefined, stream?: (boolean | null) | undefined, stop?: (string | Array<string> | null) | undefined, logprobs?: (boolean | null) | undefined, top_logprobs?: (number | null) | undefined, presence_penalty?: (number | null) | undefined, frequency_penalty?: (number | null) | undefined, user?: (string | null) | undefined, n_ctx?: (number | null) | undefined, n_batch?: (number | null) | undefined, n_gpu_layers?: (number | null) | undefined, n_threads?: (number | null) | undefined, flash_attn?: (boolean | null) | undefined, use_mmap?: (boolean | null) | undefined, use_mlock?: (boolean | null) | undefined, cache_type_k?: (string | null) | undefined, cache_type_v?: (string | null) | undefined, extra_body?: ({[key: string]: unknown} | null) | undefined, tools?: (Array<ChatCompletionFunctionToolParam> | null) | undefined, tool_choice?: (string | {[key: string]: unknown} | null) | undefined, think?: (boolean | null) | undefined, thinking_budget?: (number | null) | undefined, cache_key?: (string | null) | undefined, return_cache_key?: (boolean | null) | undefined, auto_truncate?: (boolean | null) | undefined, truncation_strategy?: (string | null) | undefined};

export type CreateApiV1ChatCompletionsArgs = {body: ChatCompletionRequest};

export type CreateApiV1ChatCompletionsOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const createApiV1ChatCompletionsResponse = 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
};

/**
 * Chat Completions
 * 
 * POST /v1/chat/completions
 */
export const createApiV1ChatCompletions = async (args: CreateApiV1ChatCompletionsArgs, options: CreateApiV1ChatCompletionsOptions) => {
const {baseUrl, 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 = `${baseUrl.replace(/\/+$/, '')}/v1/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(createApiV1ChatCompletionsResponse, await res.json())
};