// Investments tab: nine societies in three risk tiers, all visible at once.

import { portfolio } from '../engine/investments.js';
import { t } from '../services/i18n.js';
import { h, icon, makeBuyable, setBuyable } from './dom.js';
import { bump, floater, pop, purchased } from './fx.js';
import { moneyFormatter, setText, signedPercent } from './text.js';

const AMOUNTS = [0.01, 0.1, 0.5, 1];
const TIERS = ['low', 'mid', 'high'];

export function createInvestView(root, actions) {
  let ctx;
  let fmt;
  let money;
  let amount = 0.1;
  let summary;
  const rows = new Map();

  function societyRow(society) {
    const change = h('span', { class: 'badge' });
    const price = h('span');
    const held = h('span');
    const sell = h('button', {
      class: 'btn',
      type: 'button',
      text: t('invest.sell'),
      onclick: (event) => {
        event.stopPropagation(); // the block itself buys
        if (actions.sell(society.id, amount)) {
          pop(root);
          floater(sell, '↘');
          bump(held);
        }
      },
    });
    const root = h(
      'li',
      { class: 'card card--stack' },
      h(
        'div',
        { class: 'card__row' },
        icon(`inv.${society.id}`),
        h(
          'div',
          { class: 'card__body' },
          h('h3', { class: 'card__title' }, h('span', { text: t(`theme.inv.${society.id}.name`) }), change),
          h('p', { class: 'card__meta' }, price),
          h('p', { class: 'card__meta' }, held),
        ),
      ),
      h('div', { class: 'card__actions' }, h('span', { class: 'card__hint', text: t('invest.clickToBuy') }), sell),
    );
    makeBuyable(root, () => {
      if (!actions.buy(society.id, amount)) return;
      purchased(root, '↗');
      bump(held);
    });
    return { root, change, price, held, sell };
  }

  function tierPanel(tier) {
    const cfg = ctx.investments.tiers[tier];
    const list = h('ul', { class: 'cards' });
    for (const society of ctx.investments.societies.filter((s) => s.tier === tier)) {
      const row = societyRow(society);
      rows.set(society.id, row);
      list.append(row.root);
    }
    return h(
      'section',
      { class: `panel panel--${tier}` },
      h('h2', { class: 'panel__title', text: t(`invest.tier.${tier}`) }),
      h('p', {
        class: 'hint',
        text: t('invest.tierInfo', {
          swing: fmt.number(cfg.swing * 100),
          dividend: fmt.number(cfg.dividend * 100),
        }),
      }),
      list,
    );
  }

  function rebuild(newCtx, formatter) {
    ctx = newCtx;
    fmt = formatter;
    money = moneyFormatter(fmt);
    rows.clear();

    summary = {
      value: h('strong'),
      basis: h('strong'),
      profit: h('strong'),
      next: h('p', { class: 'hint' }),
    };
    const amountGroup = h(
      'fieldset',
      { class: 'segmented' },
      h('legend', { class: 'sr-only', text: t('invest.amount') }),
      ...AMOUNTS.map((a) =>
        h(
          'label',
          {},
          h('input', {
            type: 'radio',
            name: 'invest-amount',
            value: String(a),
            checked: a === amount,
            onchange: () => {
              amount = a;
            },
          }),
          h('span', { text: `${a * 100}%` }),
        ),
      ),
    );

    root.replaceChildren(
      h(
        'section',
        { class: 'panel panel--wide' },
        h('h2', { class: 'panel__title', text: t('tab.invest') }),
        h('p', {
          class: 'hint',
          text: t('invest.intro', {
            seconds: ctx.investments.intervalSeconds,
            fee: fmt.number(ctx.investments.fee * 100),
          }),
        }),
        h(
          'dl',
          { class: 'stats' },
          h('div', {}, h('dt', { text: t('invest.portfolio') }), h('dd', {}, summary.value)),
          h('div', {}, h('dt', { text: t('invest.invested') }), h('dd', {}, summary.basis)),
          h('div', {}, h('dt', { text: t('invest.profit') }), h('dd', {}, summary.profit)),
        ),
        h('p', { class: 'field__label', text: t('invest.amountLabel') }),
        amountGroup,
        summary.next,
      ),
      ...TIERS.map(tierPanel),
    );
  }

  function update(state) {
    const p = portfolio(state, ctx);
    setText(summary.value, money(p.value));
    setText(summary.basis, money(p.basis));
    setText(summary.profit, money(p.profit));
    summary.profit.classList.toggle('pos', p.profit > 0);
    summary.profit.classList.toggle('neg', p.profit < 0);
    const remaining = Math.ceil(ctx.investments.intervalSeconds - state.investTimer);
    setText(summary.next, t('invest.nextUpdate', { seconds: remaining }));

    for (const society of ctx.investments.societies) {
      const row = rows.get(society.id);
      const price = state.invest.prices[society.id];
      const shares = state.invest.holdings[society.id];
      const change = state.invest.change[society.id];
      const basis = state.invest.basis[society.id];

      const arrow = change > 0 ? '▲' : change < 0 ? '▼' : '■';
      setText(row.change, `${arrow} ${signedPercent(change, fmt)}`);
      row.change.classList.toggle('pos', change > 0);
      row.change.classList.toggle('neg', change < 0);

      setText(
        row.price,
        t('invest.priceLine', {
          price: fmt.price(price),
          gap: signedPercent(price / society.basePrice - 1, fmt),
        }),
      );
      const value = shares * price;
      setText(
        row.held,
        shares > 0
          ? t('invest.heldLine', { value: money(value), profit: signedPercent(basis > 0 ? value / basis - 1 : 0, fmt) })
          : t('invest.heldNone'),
      );
      setBuyable(row.root, state.funds >= 0.01);
      row.sell.disabled = shares <= 0;
    }
  }

  return { rebuild, update };
}