import {z} from 'zod'

export type B2BChatRequest = {message: string, conversation_id?: (string | null) | undefined, church_name?: (string | null) | undefined, church_url?: (string | null) | undefined, bible_version?: (string | null) | undefined};

export type CreateApiApiB2bChatbotArgs = {body: B2BChatRequest};

export type CreateApiApiB2bChatbotOptions = {baseUrl: string, fetch?: typeof fetch | undefined};

export const source = z.object({title: z.string(), url: z.string(), snippet: z.string().nullable().optional(), favicon: z.string().nullable().optional(), domain: z.string().nullable().optional()});

export const b2BChatResponse = z.object({reply: z.string().nullable().optional(), conversation_id: z.string(), bible_verses: z.array(z.string()).optional(), sources: z.array(source).nullable().optional(), thoughts: z.string().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
};

/**
 * Chat
 * 
 * POST /api/b2b/chatbot
 */
export const createApiApiB2bChatbot = async (args: CreateApiApiB2bChatbotArgs, options: CreateApiApiB2bChatbotOptions) => {
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")

const url = `${baseUrl.replace(/\/+$/, '')}/api/b2b/chatbot${query.size > 0 ? `?${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(b2BChatResponse, await res.json())
};