import {z} from 'zod'

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

export type ImageURL = {url: string};

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

export type ChatMessage = {role: 'system' | 'developer' | 'user' | 'assistant', content?: (string | Array<TextContentPart | ImageContentPart> | null) | undefined};

export type StreamOptions = {include_usage?: boolean | undefined};

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

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

export type JSONSchemaSpec = {name: string, schema?: ({[key: string]: unknown} | null) | undefined};

export type ResponseFormatJSONSchema = {type: 'json_schema', json_schema: JSONSchemaSpec};

export type ChatCompletionRequest = {messages: Array<ChatMessage>, model: 'jina-ocr-v1', stream?: boolean | undefined, stream_options?: (StreamOptions | null) | undefined, max_completion_tokens?: (number | null) | undefined, temperature?: (number | null) | undefined, top_p?: (number | null) | undefined, presence_penalty?: (number | null) | undefined, frequency_penalty?: (number | null) | undefined, stop?: (string | Array<string> | null) | undefined, seed?: (number | null) | undefined, logprobs?: (boolean | null) | undefined, top_logprobs?: (number | null) | undefined, logit_bias?: ({[key: string]: number} | null) | undefined, response_format?: (ResponseFormatText | ResponseFormatJSONObject | ResponseFormatJSONSchema | null) | undefined};

export type CreateApiV1ChatCompletionsArgs = {body: ChatCompletionRequest};

export type CreateApiV1ChatCompletionsOptions = {baseUrl?: string | undefined, HTTPBearer?: string | undefined, 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 = "https://api.jina.ai", fetch: fetchFn = fetch, HTTPBearer} = options ?? {}

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

if (HTTPBearer !== undefined) headers.set('authorization', `Bearer ${HTTPBearer}`)

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())
};