// app/page.tsx
// Dashboard / landing. Server-rendered summary tiles + sections
// driven by direct PocketBase calls via lib/pb.ts.
//
// The page itself stays thin — it loads the data and passes it to
// components/Dashboard.tsx, which owns the visual layout. This
// keeps PB error handling in one place and lets the dashboard
// component stay testable in isolation.
//
// All PB queries run in parallel (Promise.all) to keep first paint
// under a single round-trip.

import { fetchCollection } from "@/lib/pb";
import type {
  YsterbaardCompany,
  YsterbaardDirector,
} from "@/lib/types";
import { deriveCompanyStatus } from "@/lib/format";
import Dashboard from "@/components/Dashboard";
import PageHeader from "@/components/PageHeader";
import type { OverviewSearchItem } from "@/components/OverviewSearch";

export const dynamic = "force-dynamic";

async function loadDashboardData() {
  // Parallel PB calls. Each one is bounded (perPage=500 or 5).
  const [
    directorsCount,
    companiesCount,
    companiesFull,
    directorsFull,
    recentCompanies,
    recentDirectors,
    // Overview search index — only the fields the global search bar
    // matches against (CK no + every SARS / UIF / COID number).
    searchIndex,
  ] = await Promise.all([
    fetchCollection<YsterbaardDirector>("ysterbaard_directors", {
      page: 1,
      perPage: 1,
      fields: "id",
    }),
    fetchCollection<YsterbaardCompany>("ysterbaard_companies", {
      page: 1,
      perPage: 1,
      fields: "id",
    }),
    // Full sweep for status rollups + client counts.
    fetchCollection<YsterbaardCompany>("ysterbaard_companies", {
      page: 1,
      perPage: 500,
      fields:
        "id,enterprise_no,enterprise_name,enterprise_status,is_active,is_client",
    }),
    // Directors sweep for client count + active-role count.
    fetchCollection<YsterbaardDirector>("ysterbaard_directors", {
      page: 1,
      perPage: 500,
      fields: "id,total_companies,is_client",
    }),
    fetchCollection<YsterbaardCompany>("ysterbaard_companies", {
      page: 1,
      perPage: 5,
      sort: "-last_checked",
      fields:
        "id,enterprise_no,enterprise_name,enterprise_status,is_active,is_client,last_checked",
    }),
    fetchCollection<YsterbaardDirector>("ysterbaard_directors", {
      page: 1,
      perPage: 5,
      sort: "-last_checked",
      fields:
        "id,id_no,first_names,surname,total_companies,is_client,last_checked",
    }),
    fetchCollection<OverviewSearchItem>("ysterbaard_companies", {
      page: 1,
      perPage: 500,
      fields:
        "id,enterprise_no,enterprise_name,sars_tax_number,sars_paye_no,sars_vat_no,uif_registration_number,compensation_fund_registration_number",
    }),
  ]);

  // Company rollups
  const rollup = companiesFull.items.reduce(
    (acc, c) => {
      const bucket = deriveCompanyStatus(c.enterprise_status, c.is_active);
      if (bucket === "active") acc.active += 1;
      else if (bucket === "inactive") acc.inactive += 1;
      else if (bucket === "in_process") acc.in_process += 1;
      else if (bucket === "deregistered") acc.deregistered += 1;
      if (c.is_client) acc.clients += 1;
      return acc;
    },
    { active: 0, inactive: 0, in_process: 0, deregistered: 0, clients: 0 }
  );

  // Director rollups
  const directorRollup = directorsFull.items.reduce(
    (acc, d) => {
      if ((d.total_companies ?? 0) > 0) acc.activeRoles += 1;
      if (d.is_client) acc.clients += 1;
      return acc;
    },
    { activeRoles: 0, clients: 0 }
  );

  return {
    kpis: {
      directors: {
        total: directorsCount.totalItems,
        activeRoles: directorRollup.activeRoles,
        clients: directorRollup.clients,
      },
      companies: {
        total: companiesCount.totalItems,
        active: rollup.active,
        inProcess: rollup.in_process,
        inactive: rollup.inactive,
        deregistered: rollup.deregistered,
        clients: rollup.clients,
      },
    },
    statusDistribution: [
      { key: "active", label: "In business", count: rollup.active },
      { key: "in_process", label: "In process", count: rollup.in_process },
      { key: "inactive", label: "Inactive", count: rollup.inactive },
      { key: "deregistered", label: "Deregistered", count: rollup.deregistered },
    ] as const,
    recentCompanies: recentCompanies.items,
    recentDirectors: recentDirectors.items,
    searchIndex: searchIndex.items,
  };
}

export default async function DashboardPage() {
  const data = await loadDashboardData();

  return (
    <>
      <PageHeader
        eyebrow="Overview"
        title="Registry dashboard"
        subtitle="Live counts from PocketBase. Click into a section for the full searchable list."
        action={null}
      />

      <Dashboard {...data} />
    </>
  );
}