import {z} from 'zod'

export type AIModel = 'gpt-oss-120b' | 'gpt-oss-20b' | 'gpt-5.2' | 'gpt-5.5' | 'gpt-5.6-terra' | 'gpt-6-luna' | 'gpt-6.1-sol' | 'gpt-6.1-terra' | 'claude-opus-5-5' | 'claude-sonnet-5-5' | 'claude-haiku-5-5' | 'gemini-2.5-pro' | 'gemini-3-flash' | 'gemini-3.1-flash-lite' | 'gemini-3.1-pro' | 'gemini-3.5-flash-lite' | 'gemini-3.6-flash' | 'gemini-3.8-flash' | 'grok-4.7' | 'DeepSeek-V3.1' | 'DeepSeek-R1' | 'DeepSeek-V4-Flash' | 'DeepSeek-V4.1-Flash' | 'kimi-k2.6' | 'mistral-medium-3.5' | 'mistral-small-2603' | 'glm-5.2' | 'glm-5.3-flash' | 'auto';

export type CreateApiChatArgs = {body: {chatbotId: string, messages: Array<{role: 'user' | 'assistant', content: string}>, conversationId?: string | undefined, contactId?: string | undefined, model?: AIModel | undefined, temperature?: number | undefined, stream?: boolean | undefined}};

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

export const createApiChatResponse = z.object({text: z.string().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 with a chatbot
 * 
 * POST /chat
 */
export const createApiChat = async (args: CreateApiChatArgs, options?: CreateApiChatOptions) => {
const {baseUrl = "https://www.chatbase.co/api/v1", 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 (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

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