import {z} from 'zod'

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

export type ToolCallReference = {index?: number | undefined, id?: string | undefined, type?: 'function' | undefined, function: {name: string, arguments?: string | undefined}};

export type ChatCompletionMessage = {role: 'system' | 'user' | 'assistant' | 'tool' | 'developer', content?: (string | Array<ContentPart>) | undefined, name?: string | undefined, tool_call_id?: string | undefined, tool_calls?: Array<ToolCallReference> | undefined};

export type ChatCompletionRequest = {model?: string | undefined, messages: Array<ChatCompletionMessage>, stream?: boolean | undefined, stream_options?: ({include_usage?: boolean | undefined}) | undefined, temperature?: number | undefined, top_p?: number | undefined, max_tokens?: number | undefined, stop?: (string | Array<string>) | undefined};

export type CreateApiV1ChatCompletionsArgs = {'X-Conversation-Id'?: string | undefined, body: ChatCompletionRequest};

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

export const contentPart = z.object({type: z.enum(["text", "image_url"]), text: z.string().optional(), image_url: z.object({url: z.string(), detail: z.enum(["auto", "low", "high"]).optional()}).optional()});

export const toolCallReference = z.object({index: z.number().int().optional(), id: z.string().optional(), type: z.literal("function").optional(), function: z.object({name: z.string(), arguments: z.string().optional()})});

export const chatCompletionMessage = z.object({role: z.enum(["system", "user", "assistant", "tool", "developer"]), content: z.union([z.string(), z.array(contentPart)]).optional(), name: z.string().optional(), tool_call_id: z.string().optional(), tool_calls: z.array(toolCallReference).optional()});

export const chatCompletionChoice = z.object({index: z.number().int(), message: chatCompletionMessage, finish_reason: z.enum(["stop", "tool_calls", "error", "length"]).optional()});

export const chatCompletionUsage = 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: chatCompletionUsage.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 = "http://127.0.0.1:8083", 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-Conversation-Id'] != null) headers.set("X-Conversation-Id", String(args['X-Conversation-Id']))
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())
};