import type { HeadersFunction, LoaderFunctionArgs } from "react-router";
import { useLoaderData } from "react-router";
import { boundary } from "@shopify/shopify-app-react-router/server";
import { authenticate } from "../shopify.server";
import db from "../db.server";
import { gql, syncShop } from "../lib/shop.server";
import { currentMonthOrders, publishShop } from "../lib/publish.server";
import { planOf } from "../lib/plans";
import { moneyFormatter, offerStatus, offerSummary } from "../lib/offer-text";
import { formatShopDate } from "../lib/tz";
import { CONFIG_MAX_BYTES } from "../lib/compile";
import { upcomingFestivals } from "../lib/templates";

function settingsMenuLinked(settings: unknown) {
  return !!(settings && typeof settings === "object" && (settings as { menuLinked?: boolean }).menuLinked);
}

const THEME_QUERY = `#graphql
  query BundleOffersTheme {
    themes(first: 1, roles: [MAIN]) {
      nodes { id name files(filenames: ["config/settings_data.json"]) { nodes { body { ... on OnlineStoreThemeFileBodyText { content } } } } }
    }
  }`;

async function setupState(admin: Parameters<typeof gql>[0]) {
  let embedOn = false;
  let themeId = "";
  try {
    const t = await gql(admin, THEME_QUERY);
    const theme = t.themes.nodes[0];
    themeId = theme?.id?.split("/").pop() || "";
    const content: string = theme?.files?.nodes?.[0]?.body?.content || "";
    // app embeds are stored under current.blocks with type "shopify://apps/<app>/blocks/<handle>/<uuid>"
    const json = JSON.parse(content.replace(/\/\*[\s\S]*?\*\//g, "") || "{}");
    const blocks = json?.current?.blocks || {};
    embedOn = Object.values(blocks).some((b) => {
      const block = b as { type?: string; disabled?: boolean };
      return typeof block.type === "string" && block.type.includes("/blocks/bundle-offers-embed/") && !block.disabled;
    });
  } catch {
    /* read_themes missing or theme unreadable: show the step as to-do */
  }
  return { embedOn, themeId };
}

export const loader = async ({ request }: LoaderFunctionArgs) => {
  const { admin, session } = await authenticate.admin(request);
  const shop = await syncShop(admin, session.shop, { fresh: true }); // plan straight from Shopify App Pricing
  if (!shop.lastPublishedAt) await publishShop(admin, session.shop);
  const plan = planOf(shop.planCode);
  const now = new Date();
  const offers = await db.offer.findMany({ where: { shopId: shop.id, active: true }, orderBy: [{ sequence: "asc" }] });
  const running = offers.filter((o) => offerStatus(o, now) === "running");
  const since = new Date(now.getTime() - 30 * 86400000);
  const usage = await db.orderUsage.aggregate({ where: { shopId: shop.id, createdAt: { gte: since } }, _sum: { discount: true, bundleRevenue: true } });
  const orders = await db.orderUsage.groupBy({ by: ["orderId"], where: { shopId: shop.id, createdAt: { gte: since } } });
  const setup = await setupState(admin);
  const money = moneyFormatter(shop.currency);
  const apiKey = process.env.SHOPIFY_API_KEY || "";
  return {
    shop: { domain: shop.domain, publishError: shop.publishError, configBytes: shop.configBytes, monthOrders: currentMonthOrders(shop) },
    plan,
    running: running.map((o) => ({ id: o.id, name: o.name, summary: offerSummary(o, money), ends: formatShopDate(o.endsAt, shop.timezone) })),
    totalOffers: offers.length,
    stats: {
      orders: orders.length,
      revenue: money(Number(usage._sum.bundleRevenue || 0)),
      discount: money(Number(usage._sum.discount || 0)),
    },
    setup,
    menuLinked: settingsMenuLinked(shop.settings),
    embedLink: `https://${shop.domain}/admin/themes/${setup.themeId || "current"}/editor?context=apps&activateAppId=${apiKey}/bundle-offers-embed`,
    festivals: upcomingFestivals(now, 120).slice(0, 4),
    configMax: CONFIG_MAX_BYTES,
  };
};

export default function Home() {
  const d = useLoaderData<typeof loader>();
  const steps = [
    { done: d.setup.embedOn, label: "Turn on the Offerlyst app embed", help: "Loads the storefront script and styles (cart hints, add bundle to cart).", action: <s-button href={d.embedLink} target="_blank">Open theme editor</s-button> },
    { done: d.menuLinked, label: "Link the bundles page in your menu", help: "Your bundles page is at /apps/bundles. Add it to the main menu (Online Store › Navigation), or place the “Bundles grid” block on any page.", action: <s-button href={`https://${d.shop.domain}/admin/menus`} target="_blank">Open navigation</s-button> },
    { done: d.totalOffers > 0, label: "Create your first offer", help: "Start from scratch or from a festival template.", action: <s-button href="/app/offers/new">Create offer</s-button> },
    { done: d.running.length > 0, label: "Publish an offer and preview it", help: "Published offers within their dates run automatically in cart and checkout.", action: <s-button href={`https://${d.shop.domain}/apps/bundles`} target="_blank">View bundles page</s-button> },
  ];
  const doneCount = steps.filter((s) => s.done).length;

  return (
    <s-page heading="Offerlyst">
      <s-button slot="primary-action" variant="primary" href="/app/offers/new">Create offer</s-button>

      {d.shop.publishError ? (
        <s-banner tone="critical" heading="Your offers could not be published"><s-paragraph>{d.shop.publishError}</s-paragraph></s-banner>
      ) : null}
      {d.plan.monthlyOrders !== Infinity && d.shop.monthOrders >= d.plan.monthlyOrders ? (
        <s-banner tone="warning" heading={`You've reached ${d.plan.monthlyOrders} bundle orders this month`}>
          <s-paragraph>Bundle discounts are paused until next month. Upgrade to keep them running.</s-paragraph>
          <s-button slot="secondary-actions" href="/app/plans">See plans</s-button>
        </s-banner>
      ) : null}

      {doneCount < steps.length ? (
        <s-section heading={`Setup: ${doneCount} of ${steps.length} done`}>
          <s-stack gap="base">
            {steps.map((s) => (
              /* icon | text | action in fixed columns, so long help text wraps inside its column */
              <s-grid key={s.label} gridTemplateColumns="auto 1fr auto" gap="base" alignItems="center">
                <s-icon type={s.done ? "check-circle" : "circle"} tone={s.done ? "success" : "neutral"} />
                <s-stack gap="small-500">
                  <s-text type="strong">{s.label}</s-text>
                  <s-text color="subdued">{s.help}</s-text>
                </s-stack>
                {s.done ? <span /> : s.action}
              </s-grid>
            ))}
          </s-stack>
        </s-section>
      ) : null}

      <s-section heading="Last 30 days">
        <s-grid gridTemplateColumns="1fr 1fr 1fr" gap="base">
          <s-box padding="base" background="subdued" borderRadius="base"><s-stack gap="small-500"><s-text color="subdued">Bundle orders</s-text><s-heading>{String(d.stats.orders)}</s-heading></s-stack></s-box>
          <s-box padding="base" background="subdued" borderRadius="base"><s-stack gap="small-500"><s-text color="subdued">Bundle revenue</s-text><s-heading>{d.stats.revenue}</s-heading></s-stack></s-box>
          <s-box padding="base" background="subdued" borderRadius="base"><s-stack gap="small-500"><s-text color="subdued">Discounts given</s-text><s-heading>{d.stats.discount}</s-heading></s-stack></s-box>
        </s-grid>
      </s-section>

      <s-section heading="Running now">
        {d.running.length ? (
          <s-stack gap="small-200">
            {d.running.map((o) => (
              <s-stack key={o.id} direction="inline" justifyContent="space-between">
                <s-link href={`/app/offers/${o.id}`}>{o.name}</s-link>
                <s-text color="subdued">{o.summary}{o.ends ? ` · ends ${o.ends}` : ""}</s-text>
              </s-stack>
            ))}
          </s-stack>
        ) : <s-paragraph>No offer is running. Published offers within their dates run automatically.</s-paragraph>}
      </s-section>

      <s-section slot="aside" heading="Plan">
        <s-stack gap="small-200">
          <s-text type="strong">{d.plan.name}</s-text>
          <s-text>Running offers: {d.running.length} of {d.plan.runningOffers === Infinity ? "unlimited" : d.plan.runningOffers}</s-text>
          {d.plan.monthlyOrders !== Infinity ? <s-text>Bundle orders this month: {d.shop.monthOrders} of {d.plan.monthlyOrders}</s-text> : null}
          <s-text color="subdued">Discount configuration: {Math.round((d.shop.configBytes / d.configMax) * 100)}% of the limit</s-text>
          <s-button href="/app/plans">Plans</s-button>
        </s-stack>
      </s-section>

      <s-section slot="aside" heading="Coming up">
        <s-stack gap="small-200">
          {d.festivals.map((f) => <s-text key={f.key}>{f.name}: {f.date}{f.approximate ? " (approx.)" : ""}</s-text>)}
          <s-button href="/app/templates">Festival templates</s-button>
        </s-stack>
      </s-section>
    </s-page>
  );
}

export const headers: HeadersFunction = (headersArgs) => boundary.headers(headersArgs);