import {z} from 'zod'

export type SourceEventsHashmap = {[key: string]: Array<string>};

export type SourceEntityHashmap = Array<string>;

export type SourceProcessingChannelHashmap = Array<string>;

export type WorkflowCondition = {type: string, events: SourceEventsHashmap} | {type: string, entities: SourceEntityHashmap} | {type: string, processing_channels: SourceProcessingChannelHashmap};

export type WorkflowAction = {type: string, url: string, headers?: {[key: string]: string} | undefined, signature?: ({method?: string | undefined, key: string}) | undefined};

export type AddWorkflowRequest = {name?: string | undefined, active?: boolean | undefined, conditions?: Array<WorkflowCondition> | undefined, actions?: Array<WorkflowAction> | undefined};

export type CreateApiWorkflowsArgs = {body: AddWorkflowRequest};

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

export const link = z.object({href: z.string()});

export const workflowLinks = z.object({self: link});

export const addWorkflowResponse = z.object({id: z.string().optional(), _links: workflowLinks.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
};

/**
 * Add a workflow
 * 
 * POST /workflows
 * 
 * Also accepts auth: ApiSecretKey
 */
export const createApiWorkflows = async (args: CreateApiWorkflowsArgs, options: CreateApiWorkflowsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, OAuth} = options ?? {}

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

if (OAuth !== undefined) headers.set('authorization', `Bearer ${OAuth}`)

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