"use client";

import { useState } from "react";
import { AlertTriangle, MapPin, MapPinned } from "lucide-react";
import { SiteIncomeView } from "@/components/SiteIncomeView";
import { SitesView } from "@/components/SitesView";
import type { SiteIncomeRow } from "@/lib/site-income";
import type { SiteSummary } from "@/lib/sites";
import { ZAR2 } from "@/lib/utils";

export function SitesOverview({ postedRows, billedRows, year, invoiceCount, monthIndex }: {
  postedRows: SiteIncomeRow[];
  billedRows: SiteSummary[];
  year: number;
  invoiceCount: number;
  monthIndex: number;
}) {
  const [view, setView] = useState<"posted" | "billed">("posted");
  const totalIncl = billedRows.reduce((sum, row) => sum + row.revenueIncl, 0);
  const totalExcl = billedRows.reduce((sum, row) => sum + row.revenueExcl, 0);
  const totalVat = billedRows.reduce((sum, row) => sum + row.vat, 0);
  const outstanding = billedRows.reduce((sum, row) => sum + row.unbookedCount, 0);
  const unpinned = billedRows.filter((row) => !row.pinned).length;

  return (
    <>
      <div className="mb-6 flex min-w-0 flex-col gap-4 lg:flex-row lg:items-center lg:justify-between">
        <div className="flex items-center gap-3">
          <div className="grid h-10 w-10 shrink-0 place-items-center rounded-xl bg-gradient-to-br from-[#EDAE49]/20 to-[#00798C]/15 text-[#00798C]">
            <MapPin className="h-5 w-5" aria-hidden="true" />
          </div>
          <h1 className="text-2xl font-semibold text-[#003D5B] dark:text-white">Sites</h1>
        </div>
        <div role="group" aria-label="Site amounts" className="grid w-full grid-cols-2 gap-1 rounded-xl border border-gray-200 bg-white p-1 dark:border-border dark:bg-surface lg:w-auto">
          {([
            ["posted", "Posted income"],
            ["billed", "Billed invoices"],
          ] as const).map(([value, label]) => (
            <button
              key={value}
              type="button"
              onClick={() => setView(value)}
              aria-pressed={view === value}
              aria-controls="sites-amounts-panel"
              className={`min-h-[44px] min-w-[44px] rounded-lg px-3 text-sm font-medium focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-[#00798C] ${view === value
                ? "bg-[#003D5B] text-white dark:bg-[#00798C]"
                : "text-gray-600 hover:bg-gray-100 dark:text-gray-300 dark:hover:bg-white/5"}`}
            >
              {label}
            </button>
          ))}
        </div>
      </div>

      <section id="sites-amounts-panel" aria-label={view === "posted" ? "Posted site income" : "Internal billed invoices"}>
        {view === "posted" ? (
          <SiteIncomeView
            rows={postedRows}
            year={year}
            monthIndex={monthIndex}
            title={
              <div className="min-w-0">
                <h2 className="text-xl font-semibold text-[#003D5B] dark:text-white">Posted income · {year}</h2>
                <p className="mt-1 text-sm text-gray-500 dark:text-gray-400">
                  Income attributed to the historical site on each invoice. External income and unallocated workbook income remain included.
                </p>
              </div>
            }
          />
        ) : (
          <>
            <div className="mb-6 flex flex-col gap-4 lg:flex-row lg:items-end lg:justify-between">
              <div className="min-w-0">
                <h2 className="text-xl font-semibold text-[#003D5B] dark:text-white">Internal billed invoices · {year}</h2>
                <p className="mt-1 text-sm text-gray-500 dark:text-gray-400">
                  What each site was billed per month from {invoiceCount} imported internal invoice{invoiceCount === 1 ? "" : "s"}.
                </p>
                <p className="mt-1 text-sm text-gray-500 dark:text-gray-400">Billing includes unbooked lines. External billing is outside this view.</p>
              </div>
              <div className="grid min-w-0 grid-cols-1 gap-3 sm:grid-cols-2 lg:shrink-0">
                <div className="min-w-0 rounded-2xl border border-gray-100 bg-white px-5 py-3 dark:border-white/5 dark:bg-surface">
                  <div className="text-xs text-gray-500 dark:text-gray-400">Billed (ex VAT)</div>
                  <div className="break-words text-2xl font-semibold tabular-nums text-[#003D5B] dark:text-white">{ZAR2(totalExcl)}</div>
                  <div className="text-xs tabular-nums text-gray-500 dark:text-gray-400">+ {ZAR2(totalVat)} VAT</div>
                </div>
                <div className="min-w-0 rounded-2xl bg-gradient-to-br from-[#00798C] to-[#003D5B] px-5 py-3 text-white shadow-lg shadow-teal-500/20">
                  <div className="text-xs text-white/80">Billed (incl VAT)</div>
                  <div className="break-words text-2xl font-semibold tabular-nums">{ZAR2(totalIncl)}</div>
                </div>
              </div>
            </div>

            {unpinned > 0 && (
              <div className="mb-5 flex items-start gap-3 rounded-xl border border-[#EDAE49]/20 bg-[#EDAE49]/10 px-4 py-3">
                <MapPinned className="mt-0.5 h-4 w-4 shrink-0 text-[#8a6420] dark:text-[#EDAE49]" aria-hidden="true" />
                <p className="text-sm text-[#8a6420] dark:text-[#EDAE49]">
                  {unpinned} of {billedRows.length} billed sites have no coordinates yet. Open a site to pin it.
                </p>
              </div>
            )}
            {outstanding > 0 && (
              <div className="mb-5 flex items-start gap-3 rounded-xl border border-[#D1495B]/15 bg-[#D1495B]/5 px-4 py-3">
                <AlertTriangle className="mt-0.5 h-4 w-4 shrink-0 text-[#D1495B]" aria-hidden="true" />
                <p className="text-sm text-[#D1495B]">
                  {outstanding} line{outstanding === 1 ? "" : "s"} across these sites still have no machine or booked site. Open an invoice and assign one. Their billed amounts are included above.
                </p>
              </div>
            )}
            {billedRows.length ? <SitesView rows={billedRows} year={year} /> : (
              <div className="rounded-2xl border border-gray-100 bg-white p-8 text-center dark:border-white/5 dark:bg-surface">
                <p className="text-sm text-gray-500 dark:text-gray-400">No internal site billing recorded for {year}.</p>
                <p className="mt-1 text-sm text-gray-400 dark:text-gray-500">Sites appear here as internal invoices are imported.</p>
              </div>
            )}
          </>
        )}
      </section>
    </>
  );
}