import {z} from 'zod'

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

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

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

export type ContentPart = TextContentPart | ImageContentPart;

export type ChatMessage = {role: 'system' | 'user' | 'assistant' | 'tool', content: string | Array<ContentPart>, name?: string | undefined};

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

export type CreateApiV1ChatCompletionsArgs = {'X-Free-Tier'?: 'true' | undefined, body: ChatCompletionRequest};

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

export const chatMessageResponse = z.object({role: z.literal("assistant"), content: z.string()});

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

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

export const chatCompletionResponse = z.object({id: z.string(), object: z.literal("chat.completion"), created: z.number().int(), model: z.string(), choices: z.array(chatCompletionChoice), usage: usage.optional(), remaining_credits: z.number().int().nullable().optional(), estimated_credits_used: z.number().int().optional(), estimated_cost_usd: z.number().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 a chat completion
 * 
 * POST /v1/chat/completions
 */
export const createApiV1ChatCompletions = async (args: CreateApiV1ChatCompletionsArgs, options?: CreateApiV1ChatCompletionsOptions) => {
const {baseUrl = "https://api.abliteration.ai", 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 (args['X-Free-Tier'] != null) headers.set("X-Free-Tier", String(args['X-Free-Tier']))
if (BearerAuth !== undefined) headers.set('authorization', `Bearer ${BearerAuth}`)

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(chatCompletionResponse, await res.json())
};