import * as wmill from "https://deno.land/x/windmill@v1.39.0/mod.ts"

export async function main() {

  const state = await wmill.getInternalState();

  const previousLatestId = state?.latestId ?? 0;

  // Fetch and validate

  const data = await (await fetch('https://hub.windmill.dev/searchFlowData')).json();

  const flows = assertFlows(data.flows);

  const newFlows = flows.filter(flow => flow.flow_id > previousLatestId);

  // Update state

  const latestId: number = flows.reduce((prevId, flow) => {

    return Math.max(prevId, flow.flow_id);

  }, previousLatestId);

  const newState = {

    ...state,

    latestId,

  };

  await wmill.setInternalState(newState);

  console.info('old state', state);

  console.info('new state', newState);

  // Return new flows

  return newFlows;

}

function assertFlows(items: any): { flow_id: number }[] {

  if (!Array.isArray(items)) {

    throw Error('"flows" must be an array');

  }

  if (!items.every((item: any) => !!item && Number.isInteger(item.flow_id))) {

    throw Error('Not all flows have an integer "flow_id"');

  }

  return items;

}