import { useState } from "react";
import type { ActionFunctionArgs, HeadersFunction, LoaderFunctionArgs } from "react-router";
import { Form, useLoaderData, useNavigation, useSearchParams, useSubmit } from "react-router";
import { boundary } from "@shopify/shopify-app-react-router/server";
import type { Prisma } from "@prisma/client";
import { authenticate } from "../shopify.server";
import db from "../db.server";
import { ensureShop } from "../lib/shop.server";
import { bulkAction, moveOffer } from "../lib/offers.server";
import { publishShop } from "../lib/publish.server";
import { moneyFormatter, offerStatus, offerSummary, STATUS_LABEL, STATUS_TONE, TYPE_LABEL } from "../lib/offer-text";
import { formatShopDate } from "../lib/tz";

export const loader = async ({ request }: LoaderFunctionArgs) => {
  const { admin, session } = await authenticate.admin(request);
  const shop = await ensureShop(admin, session.shop);
  const url = new URL(request.url);
  const filter = url.searchParams.get("filter") || "current";
  const type = url.searchParams.get("type") || "";
  const q = (url.searchParams.get("q") || "").trim();
  const now = new Date();

  const where: Prisma.OfferWhereInput = { shopId: shop.id };
  if (filter === "archived") where.active = false;
  else {
    where.active = true;
    if (filter === "published") where.published = true;
    if (filter === "current") where.OR = [{ endsAt: null }, { endsAt: { gte: now } }];
  }
  if (type) where.type = type;
  if (q) {
    where.AND = [{
      OR: [
        { name: { contains: q, mode: "insensitive" } },
        { lines: { some: { title: { contains: q, mode: "insensitive" } } } },
        { scopes: { some: { title: { contains: q, mode: "insensitive" } } } },
      ],
    }];
  }
  const offers = await db.offer.findMany({
    where,
    orderBy: [{ sequence: "asc" }, { startsAt: "desc" }, { createdAt: "desc" }],
    include: { lines: true, scopes: true, _count: { select: { usages: true } } },
  });
  const money = moneyFormatter(shop.currency);
  return {
    filter, type, q,
    offers: offers.map((o) => {
      const status = offerStatus(o, now);
      return {
        id: o.id, name: o.name, badge: o.badge, type: o.type, status,
        summary: offerSummary(o, money),
        image: o.imageUrl || o.lines.find((l) => l.imageUrl)?.imageUrl || o.scopes.find((s) => s.imageUrl)?.imageUrl || "",
        starts: formatShopDate(o.startsAt, shop.timezone),
        ends: formatShopDate(o.endsAt, shop.timezone),
        countries: o.countries.join(", "),
        orders: o._count.usages,
        published: o.published,
        active: o.active,
        limitedByPlan: o.limitedByPlan,
      };
    }),
    publishError: shop.publishError,
  };
};

export const action = async ({ request }: ActionFunctionArgs) => {
  const { admin, session } = await authenticate.admin(request);
  const shop = await ensureShop(admin, session.shop);
  const form = await request.formData();
  const intent = String(form.get("intent") || "");
  const ids = form.getAll("ids").map(String);
  const staff = session.onlineAccessInfo?.associated_user?.email;
  if (intent === "move") await moveOffer(shop.id, String(form.get("id")), form.get("direction") === "up" ? "up" : "down");
  else if (intent === "toggle") await bulkAction(shop.id, [String(form.get("id"))], form.get("published") === "1" ? "publish" : "unpublish", staff);
  else await bulkAction(shop.id, ids, intent, staff);
  const outcome = await publishShop(admin, session.shop);
  return { ok: outcome.ok, error: outcome.error };
};

const FILTERS = [
  { value: "current", label: "Current & upcoming" },
  { value: "published", label: "Published" },
  { value: "all", label: "All (not archived)" },
  { value: "archived", label: "Archived" },
];

export default function OffersIndex() {
  const { offers, filter, type, q, publishError } = useLoaderData<typeof loader>();
  const [selected, setSelected] = useState<string[]>([]);
  const [params, setParams] = useSearchParams();
  const submit = useSubmit();
  const nav = useNavigation();
  const busy = nav.state !== "idle";

  const setParam = (k: string, v: string) => {
    const next = new URLSearchParams(params);
    if (v) next.set(k, v);
    else next.delete(k);
    setParams(next);
    setSelected([]);
  };
  const bulk = (intent: string) => {
    const fd = new FormData();
    fd.set("intent", intent);
    selected.forEach((id) => fd.append("ids", id));
    submit(fd, { method: "post" });
    setSelected([]);
  };
  const toggleAll = (on: boolean) => setSelected(on ? offers.map((o) => o.id) : []);

  return (
    <s-page heading="Bundle offers" inlineSize="large">
      <s-button slot="primary-action" variant="primary" href="/app/offers/new">Create offer</s-button>
      <s-button slot="secondary-actions" href="/app/templates">Festival templates</s-button>

      {publishError ? (
        <s-banner tone="critical" heading="Offers could not be published to your store">
          <s-paragraph>{publishError}</s-paragraph>
        </s-banner>
      ) : null}

      <s-section padding="base">
        <s-stack gap="base">
          <s-grid gridTemplateColumns="2fr 1fr 1fr" gap="base">
            <Form method="get">
              <input type="hidden" name="filter" value={filter} />
              <input type="hidden" name="type" value={type} />
              <s-search-field label="Search" labelAccessibilityVisibility="exclusive" name="q" defaultValue={q} placeholder="Search by offer or product name" />
            </Form>
            <s-select label="Show" labelAccessibilityVisibility="exclusive" value={filter} onChange={(e) => setParam("filter", e.currentTarget.value)}>
              {FILTERS.map((f) => <s-option key={f.value} value={f.value}>{f.label}</s-option>)}
            </s-select>
            <s-select label="Type" labelAccessibilityVisibility="exclusive" value={type} onChange={(e) => setParam("type", e.currentTarget.value)}>
              <s-option value="">All types</s-option>
              <s-option value="fixed">Fixed bundle</s-option>
              <s-option value="mix">Mix & match</s-option>
              <s-option value="bxgy">Buy X get Y</s-option>
            </s-select>
          </s-grid>

          {selected.length ? (
            <s-stack direction="inline" gap="small-200" alignItems="center">
              <s-text>{selected.length} selected</s-text>
              <s-button onClick={() => bulk("publish")} disabled={busy}>Publish</s-button>
              <s-button onClick={() => bulk("unpublish")} disabled={busy}>Unpublish</s-button>
              <s-button onClick={() => bulk("duplicate")} disabled={busy}>Duplicate</s-button>
              {filter === "archived" ? (
                <>
                  <s-button onClick={() => bulk("unarchive")} disabled={busy}>Restore</s-button>
                  <s-button tone="critical" onClick={() => bulk("delete")} disabled={busy}>Delete</s-button>
                </>
              ) : (
                <s-button tone="critical" onClick={() => bulk("archive")} disabled={busy}>Archive</s-button>
              )}
            </s-stack>
          ) : null}

          {offers.length === 0 ? (
            <s-box padding="large-300">
              <s-stack gap="base" alignItems="center">
                <s-heading>Create your first bundle offer</s-heading>
                <s-paragraph>
                  Pick products from the catalogue, choose % off, $ off or a bundle price, and set festival dates.
                  Running offers show on the homepage, on product pages and as hints in the cart.
                </s-paragraph>
                <s-stack direction="inline" gap="base">
                  <s-button variant="primary" href="/app/offers/new">Create offer</s-button>
                  <s-button href="/app/templates">Start from a festival template</s-button>
                </s-stack>
              </s-stack>
            </s-box>
          ) : (
            <s-table>
              <s-table-header-row>
                <s-table-header>
                  <s-checkbox
                    accessibilityLabel="Select all offers"
                    checked={selected.length === offers.length}
                    onChange={(e) => toggleAll(e.currentTarget.checked)}
                  />
                </s-table-header>
                <s-table-header>Priority</s-table-header>
                <s-table-header listSlot="primary">Offer</s-table-header>
                <s-table-header>Type</s-table-header>
                <s-table-header>Dates</s-table-header>
                <s-table-header format="numeric">Orders</s-table-header>
                <s-table-header listSlot="secondary">Status</s-table-header>
                <s-table-header>Published</s-table-header>
              </s-table-header-row>
              <s-table-body>
                {offers.map((o, i) => (
                  <s-table-row key={o.id}>
                    <s-table-cell>
                      <s-checkbox
                        accessibilityLabel={`Select ${o.name}`}
                        checked={selected.includes(o.id)}
                        onChange={(e) => {
                          const on = e.currentTarget.checked;
                          setSelected((s) => (on ? [...s, o.id] : s.filter((x) => x !== o.id)));
                        }}
                      />
                    </s-table-cell>
                    <s-table-cell>
                      <s-stack direction="inline" gap="small-400">
                        <Form method="post">
                          <input type="hidden" name="intent" value="move" />
                          <input type="hidden" name="id" value={o.id} />
                          <input type="hidden" name="direction" value="up" />
                          <s-button type="submit" variant="tertiary" icon="arrow-up" accessibilityLabel={`Move ${o.name} up`} disabled={i === 0 || busy} />
                        </Form>
                        <Form method="post">
                          <input type="hidden" name="intent" value="move" />
                          <input type="hidden" name="id" value={o.id} />
                          <input type="hidden" name="direction" value="down" />
                          <s-button type="submit" variant="tertiary" icon="arrow-down" accessibilityLabel={`Move ${o.name} down`} disabled={i === offers.length - 1 || busy} />
                        </Form>
                      </s-stack>
                    </s-table-cell>
                    <s-table-cell>
                      <s-stack direction="inline" gap="base" alignItems="center">
                        <s-thumbnail src={o.image || undefined} alt="" size="small" />
                        <s-stack gap="small-500">
                          <s-link href={`/app/offers/${o.id}`}>{o.name}</s-link>
                          <s-text color="subdued">{o.summary}</s-text>
                          {o.badge ? <s-badge>{o.badge}</s-badge> : null}
                        </s-stack>
                      </s-stack>
                    </s-table-cell>
                    <s-table-cell>{TYPE_LABEL[o.type]}</s-table-cell>
                    <s-table-cell>
                      <s-stack gap="small-500">
                        <s-text>{o.starts ? `From ${o.starts}` : "No start date"}</s-text>
                        <s-text color="subdued">{o.ends ? `Ends ${o.ends}` : "No end date"}</s-text>
                        {o.countries ? <s-text color="subdued">{o.countries}</s-text> : null}
                      </s-stack>
                    </s-table-cell>
                    <s-table-cell>{o.orders}</s-table-cell>
                    <s-table-cell>
                      <s-stack gap="small-500">
                        <s-badge tone={STATUS_TONE[o.status]}>{o.active ? STATUS_LABEL[o.status] : "Archived"}</s-badge>
                        {o.limitedByPlan ? <s-badge tone="caution">Over plan limit</s-badge> : null}
                      </s-stack>
                    </s-table-cell>
                    <s-table-cell>
                      <Form method="post">
                        <input type="hidden" name="intent" value="toggle" />
                        <input type="hidden" name="id" value={o.id} />
                        <input type="hidden" name="published" value={o.published ? "0" : "1"} />
                        <s-button type="submit" variant="secondary" disabled={!o.active || busy}>
                          {o.published ? "Unpublish" : "Publish"}
                        </s-button>
                      </Form>
                    </s-table-cell>
                  </s-table-row>
                ))}
              </s-table-body>
            </s-table>
          )}
        </s-stack>
      </s-section>
    </s-page>
  );
}

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