import {z} from 'zod'

export type LivekitSetupCallParams = {externalNumber: string, trunkNumber: string, roomName: string};

export type CreateApiCommsLivekitSetupCallArgs = {TENANT: string, 'API-KEY': string, body: LivekitSetupCallParams};

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

export const toolType = z.enum(["CUSTOM", "PREDEFINED"]);

export const toolParameter = z.object({name: z.string(), description: z.string(), required: z.boolean().optional()});

export const tool = z.object({name: z.string(), description: z.string(), endpoint: z.string().nullable().optional(), type: toolType.optional(), parameters: z.array(toolParameter)});

export const llmModelType = z.enum(["gemini-2.5-flash", "claude-3-7-sonnet", "claude-3-5-haiku", "gpt-5.2", "gpt-5-mini", "gpt-5-nano", "gpt-realtime", "gpt-realtime-mini", "gemini-2.5-flash", "gemini-2.5-flash-preview-05-20", "gemini-2.5-flash-lite", "gemini-live"]);

export const aiLanguageSupport = z.enum(["multi", "en-US", "ar-SA"]);

export const silenceTrackerMode = z.enum(["ENABLED", "ON_CALL_END", "DISABLED"]);

export const livekitSetupCallResponse = z.object({prompt: z.string(), initialMessage: z.string(), tools: z.array(tool), headers: z.record(z.string(), z.string()), webhookUrl: z.string(), basePath: z.string(), modelType: llmModelType.nullable().optional(), supportedLanguage: aiLanguageSupport.nullable().optional(), silenceTrackerMode: silenceTrackerMode.nullable().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
};

/**
 * Setup Call
 * 
 * POST /comms/livekit/setup-call
 */
export const createApiCommsLivekitSetupCall = async (args: CreateApiCommsLivekitSetupCallArgs, options: CreateApiCommsLivekitSetupCallOptions) => {
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.TENANT != null) headers.set("TENANT", String(args.TENANT))
if (args['API-KEY'] != null) headers.set("API-KEY", String(args['API-KEY']))

const url = `${baseUrl.replace(/\/+$/, '')}/comms/livekit/setup-call${query.size > 0 ? `?${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(livekitSetupCallResponse, await res.json())
};