import {z} from 'zod'

export type GetApiCmmnRuntimeTasksTaskIdArgs = {taskId: string};

export type GetApiCmmnRuntimeTasksTaskIdOptions = {baseUrl: string, basicAuth?: {username: string, password: string} | undefined, fetch?: typeof fetch | undefined};

export const restVariable = z.object({name: z.string().optional(), type: z.string().optional(), value: z.object({}).optional(), valueUrl: z.string().optional(), scope: z.string().optional()});

export const taskResponse = z.object({id: z.string().optional(), url: z.string().optional(), owner: z.string().optional(), assignee: z.string().optional(), delegationState: z.string().optional(), name: z.string().optional(), description: z.string().optional(), createTime: z.string().optional(), dueDate: z.string().optional(), priority: z.number().int().optional(), suspended: z.boolean().optional(), claimTime: z.string().optional(), taskDefinitionKey: z.string().optional(), scopeDefinitionId: z.string().optional(), scopeId: z.string().optional(), subScopeId: z.string().optional(), scopeType: z.string().optional(), propagatedStageInstanceId: z.string().optional(), tenantId: z.string().optional(), category: z.string().optional(), formKey: z.string().optional(), caseInstanceId: z.string().optional(), caseInstanceUrl: z.string().optional(), caseDefinitionId: z.string().optional(), caseDefinitionUrl: z.string().optional(), parentTaskId: z.string().optional(), parentTaskUrl: z.string().optional(), executionId: z.string().optional(), processInstanceId: z.string().optional(), processDefinitionId: z.string().optional(), variables: z.array(restVariable).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
};

/**
 * Get a task
 * 
 * GET /cmmn-runtime/tasks/{taskId}
 */
export const getApiCmmnRuntimeTasksTaskId = async (args: GetApiCmmnRuntimeTasksTaskIdArgs, options: GetApiCmmnRuntimeTasksTaskIdOptions) => {
const {baseUrl, fetch: fetchFn = fetch, basicAuth} = options ?? {}

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

if (basicAuth !== undefined) headers.set('authorization', `Basic ${btoa(`${basicAuth.username}:${basicAuth.password}`)}`)

const url = `${baseUrl.replace(/\/+$/, '')}/cmmn-runtime/tasks/${encodeURIComponent(String(args.taskId))}${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(taskResponse, await res.json())
};