import {z} from 'zod'

export type GetApiChatsArgs = {limit?: number | undefined, status?: ('all' | 'unread' | 'unresolved' | 'done' | 'waiting_for_response' | 'open' | 'open_cart') | undefined, tags?: string | undefined, assignedUserPhone?: string | undefined, wabaNumbers?: string | undefined, instagramHandles?: string | undefined, nextChatId?: string | undefined, nextChatTimestamp?: number | undefined};

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

export const getApiChatsResponse = z.object({chats: z.array(z.object({chatType: z.string().optional(), name: z.string().optional(), phoneNumber: z.string().nullable().optional(), imageUrl: z.string().nullable().optional(), unreadCount: z.number().optional(), isDone: z.boolean().optional(), optIn: z.boolean().optional(), chatUpdatedTime: z.number().optional(), lastMessageTime: z.number().optional(), wabaNumber: z.string().nullable().optional(), wabaPhoneName: z.string().nullable().optional(), wabaDisplayName: z.string().nullable().optional(), assignedUserName: z.string().nullable().optional(), assignedUserNumber: z.string().nullable().optional(), tagNames: z.array(z.string()).optional(), customFields: z.array(z.object({name: z.string().optional(), type: z.string().optional(), value: z.string().nullable().optional(), values: z.array(z.object({})).optional()})).optional(), lastMessage: z.object({}).optional(), isSlaActive: z.boolean().optional(), slaDueDate: z.string().nullable().optional(), slaBreachLevel: z.string().nullable().optional(), eligibleMessageTypes: z.array(z.string()).optional(), isReminderTriggered: z.boolean().optional(), providerType: z.enum(["INSTAGRAM", "GENERIC_CHANNEL", "null"]).nullable().optional()})).optional(), paginationOptions: z.object({hasMoreChats: z.boolean().optional(), nextChatId: z.string().nullable().optional(), nextChatTimestamp: z.number().nullable().optional()}).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
};

/**
 * Fetch chat list (inbox)
 * 
 * GET /chats
 */
export const getApiChats = async (args: GetApiChatsArgs, options?: GetApiChatsOptions) => {
const {baseUrl = "https://public.doubletick.io", fetch: fetchFn = fetch, basic} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('accept', "application/json")

if (args.limit != null) query.append("limit", String(args.limit))
if (args.status != null) query.append("status", String(args.status))
if (args.tags != null) query.append("tags", String(args.tags))
if (args.assignedUserPhone != null) query.append("assignedUserPhone", String(args.assignedUserPhone))
if (args.wabaNumbers != null) query.append("wabaNumbers", String(args.wabaNumbers))
if (args.instagramHandles != null) query.append("instagramHandles", String(args.instagramHandles))
if (args.nextChatId != null) query.append("nextChatId", String(args.nextChatId))
if (args.nextChatTimestamp != null) query.append("nextChatTimestamp", String(args.nextChatTimestamp))
if (basic !== undefined) headers.set("Authorization", basic)

const url = `${baseUrl.replace(/\/+$/, '')}/chats${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(getApiChatsResponse, await res.json())
};