// The first-run checklist: the four things a new install or a new person has
// to do before an alert reaches a phone.
//
// It is computed from what the server already knows rather than from stored
// progress — a topic is set or it is not, an integration exists or it does not
// — so it cannot claim a step is done when it is not, and it comes back by
// itself if somebody deletes their integration a month later.
//
// Dismissal is the one piece of state, kept per user so finishing on a laptop
// does not leave the phone nagging.

import * as api from './api.js';
import { h, clear, spinner } from './ui.js';
import { state, currentTeam } from './state.js';
import { navigate } from './app.js';
import { isoDate } from './format.js';

let steps = null;
let error = null;
let busy = false;
let testResult = null;

// done() is deliberately a question about the world, not a flag: each step asks
// the data whether it happened.
export async function load() {
  const team = currentTeam();
  if (!team) {
    steps = null;
    return;
  }
  try {
    const [schedule, integrations, alerts] = await Promise.all([
      api.schedule(team.id, isoDate(new Date()), isoDate(new Date())),
      api.integrations(team.id),
      api.alerts({ limit: 1 }),
    ]);
    steps = [
      {
        id: 'topic',
        title: 'Set where your pages go',
        text: 'An ntfy topic on your account. Without one, incidents assigned to you page the team’s fallback topic instead of your phone.',
        done: Boolean(state.me?.user?.ntfy_topic),
        action: { label: 'Account', go: '/more' },
      },
      {
        id: 'rota',
        title: 'Put somebody on call',
        text: 'An incident opens assigned to whoever the rota says is on call today. With an empty rota it opens unassigned.',
        done: (schedule || []).length > 0,
        action: { label: 'Team', go: '/team' },
      },
      {
        id: 'integration',
        title: 'Create an alert source',
        text: 'Alerts arrive on an integration key, which says which team they belong to. Nothing can reach this team without one.',
        done: (integrations || []).length > 0,
        action: { label: 'Team', go: '/team' },
      },
      {
        id: 'alert',
        title: 'Send a test alert',
        text: 'Post to the integration URL and watch it appear in the queue. Until one arrives, none of the above is proven.',
        done: (alerts || []).length > 0,
        action: { label: 'How', go: '/team' },
      },
    ];
    error = null;
  } catch (err) {
    error = err.message;
  }
}

// visible reports whether there is anything worth showing: something undone,
// and not dismissed.
export function visible() {
  if (!steps || state.me?.onboarding_dismissed) return false;
  return steps.some((s) => !s.done);
}

export function card() {
  if (!visible()) return null;
  const remaining = steps.filter((s) => !s.done).length;

  return h('div', { class: 'card onboarding' },
    h('div', { class: 'onboarding-head' },
      h('h2', { text: 'Finish setting up' }),
      h('span', { class: 'muted small', text: `${remaining} left` }),
      h('button', {
        class: 'btn-sm', type: 'button', text: 'Hide',
        title: 'Hide this checklist for good',
        onclick: async () => {
          try {
            await api.dismissOnboarding(true);
            if (state.me) state.me.onboarding_dismissed = true;
          } catch (err) {
            error = err.message;
          }
          rerender();
        },
      })),
    error && h('p', { class: 'load-error', text: error }),
    h('ol', { class: 'checklist' }, ...steps.map(stepRow)),
    testResult && h('p', { class: testResult.ok ? 'muted small' : 'load-error', text: testResult.text }),
  );
}

function stepRow(step) {
  return h('li', { class: step.done ? 'step done' : 'step' },
    h('span', { class: 'step-mark', text: step.done ? '✓' : '' }),
    h('div', {},
      h('strong', { text: step.title }),
      h('p', { class: 'muted small', text: step.text }),
      !step.done && h('div', { class: 'step-actions' },
        h('button', {
          class: 'btn-sm', type: 'button', text: step.action.label,
          onclick: () => navigate(step.action.go),
        }),
        // The topic step is the only one this page can finish by itself, and
        // the only proof that matters is a phone buzzing.
        step.id === 'topic' && state.me?.user?.ntfy_topic && h('button', {
          class: 'btn-sm', type: 'button', text: 'Send a test push',
          disabled: busy,
          onclick: sendTest,
        }),
      )),
  );
}

async function sendTest() {
  busy = true;
  try {
    await api.testNotification();
    testResult = { ok: true, text: 'Sent. If nothing arrives, the topic is wrong or ntfy is not reachable.' };
  } catch (err) {
    testResult = { ok: false, text: err.message };
  } finally {
    busy = false;
  }
  rerender();
}

// The queue owns the card's place on the page, so ask it to redraw rather than
// reaching into its list.
let rerender = () => {};
export function onRerender(fn) {
  rerender = fn;
}