import {z} from 'zod'

export type JsonNode = Record<string, never>;

export type FunctionCallView = {name?: string | undefined, arguments?: string | undefined};

export type ToolCallView = {id?: string | undefined, type?: string | undefined, function?: FunctionCallView | undefined};

export type MessageView = {role?: string | undefined, content?: JsonNode | undefined, tool_calls?: Array<ToolCallView> | undefined, tool_call_id?: string | undefined, name?: string | undefined};

export type FunctionDefView = {name?: string | undefined, description?: string | undefined, parameters?: JsonNode | undefined};

export type ToolView = {type?: string | undefined, function?: FunctionDefView | undefined};

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

export type ChatCompletionRequestView = {model?: string | undefined, messages?: Array<MessageView> | undefined, tools?: Array<ToolView> | undefined, tool_choice?: JsonNode | undefined, response_format?: JsonNode | undefined, stream?: boolean | undefined, stream_options?: StreamOptionsView | undefined, temperature?: number | undefined, max_tokens?: number | undefined, top_p?: number | undefined, stop?: Array<string> | undefined, n?: number | undefined};

export type CreateApiApiInferenceV1ChatCompletionsArgs = {siteId?: string | undefined, body: ChatCompletionRequestView};

export type CreateApiApiInferenceV1ChatCompletionsOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const jsonNode = z.object({});

export const functionCallView = z.object({name: z.string().optional(), arguments: z.string().optional()});

export const toolCallView = z.object({id: z.string().optional(), type: z.string().optional(), function: functionCallView.optional()});

export const messageView = z.object({role: z.string().optional(), content: jsonNode.optional(), tool_calls: z.array(toolCallView).optional(), tool_call_id: z.string().optional(), name: z.string().optional()});

export const choiceView = z.object({index: z.number().int().optional(), message: messageView.optional(), finish_reason: z.string().optional()});

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

export const chatCompletionView = z.object({id: z.string().optional(), object: z.string().optional(), created: z.number().int().optional(), model: z.string().optional(), choices: z.array(choiceView).optional(), usage: usageView.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 /api/inference/v1/chat/completions
 */
export const createApiApiInferenceV1ChatCompletions = async (args: CreateApiApiInferenceV1ChatCompletionsArgs, options: CreateApiApiInferenceV1ChatCompletionsOptions) => {
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")

if (args.siteId != null) query.append("siteId", String(args.siteId))

const url = `${baseUrl.replace(/\/+$/, '')}/api/inference/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(chatCompletionView, await res.json())
};