'use client';

import React, { useEffect, useMemo, useState } from 'react';
import DashboardLayout from '../adminDashboard/dashlayout';
import SiteCard from '@/components/dashboards/SiteCard';

type CrmProject = {
  name: string;                 // e.g. PROJ-0008 (siteId)
  project_name: string;
  status?: string | null;
  modified?: string | null;
  customer?: string | null;
  project_type?: string | null;
  custom_address?: string | null;
  custom_email?: string | null;
  custom_mobile_phone_no?: string | null;
};

const API = process.env.NEXT_PUBLIC_FASTAPI_URL;

const SitesPage = () => {
  const [projects, setProjects] = useState<CrmProject[]>([]);
  const [loading, setLoading] = useState(true);
  const [err, setErr] = useState<string | null>(null);
  const [q, setQ] = useState('');             // search filter

  // pagination
  const [page, setPage] = useState(1);
  const [pageSize, setPageSize] = useState(6); // tweak as you like

  useEffect(() => {
    let cancelled = false;
    const run = async () => {
      setLoading(true);
      setErr(null);
      try {
        const res = await fetch(`${API}/crm/projects?limit=0`);
        if (!res.ok) throw new Error(await res.text());
        const json = await res.json();
        const data: CrmProject[] = json?.data ?? [];
        if (!cancelled) setProjects(data);
      } catch (e: any) {
        if (!cancelled) setErr(e?.message ?? 'Failed to load CRM projects');
      } finally {
        if (!cancelled) setLoading(false);
      }
    };
    run();
    return () => { cancelled = true; };
  }, []);

  // Reset to first page whenever search or pageSize changes
  useEffect(() => {
    setPage(1);
  }, [q, pageSize]);

  const filtered = useMemo(() => {
    if (!q.trim()) return projects;
    const needle = q.toLowerCase();
    return projects.filter(p =>
      (p.project_name || '').toLowerCase().includes(needle) ||
      (p.name || '').toLowerCase().includes(needle) ||
      (p.customer || '').toLowerCase().includes(needle)
    );
  }, [projects, q]);

  const total = filtered.length;
  const totalPages = Math.max(1, Math.ceil(total / pageSize));
  const safePage = Math.min(page, totalPages);
  const startIdx = (safePage - 1) * pageSize;
  const endIdx = Math.min(startIdx + pageSize, total);
  const pageItems = filtered.slice(startIdx, endIdx);

  const goPrev = () => setPage(p => Math.max(1, p - 1));
  const goNext = () => setPage(p => Math.min(totalPages, p + 1));

  return (
    <DashboardLayout>
      <div className="p-6 space-y-6">
        <div className="flex flex-col md:flex-row md:items-center md:justify-between gap-3">
          <h1 className="text-2xl font-bold dark:text-white-light">All Sites Overview</h1>

          <div className="flex items-center gap-3">
            <input
              value={q}
              onChange={e => setQ(e.target.value)}
              placeholder="Search by name / ID / customer"
              className="w-64 max-w-full px-3 py-2 rounded-md border dark:border-gray-700 bg-white dark:bg-gray-900 dark:text-white"
            />
            <select
              value={pageSize}
              onChange={e => setPageSize(Number(e.target.value))}
              className="px-3 py-2 rounded-md border dark:border-gray-700 bg-white dark:bg-gray-900 dark:text-white"
              aria-label="Items per page"
            >
              <option value={6}>6 / page</option>
              <option value={9}>9 / page</option>
              <option value={12}>12 / page</option>
            </select>
          </div>
        </div>

        {loading && (
          <div className="text-gray-600 dark:text-gray-400">Loading CRM projects…</div>
        )}

        {err && (
          <div className="text-red-600">Error: {err}</div>
        )}

        {!loading && !err && total === 0 && (
          <div className="text-amber-600">No sites found.</div>
        )}

        {!loading && !err && total > 0 && (
          <>
            {/* Pagination header */}
            <div className="flex items-center justify-between">
              <div className="text-sm text-gray-600 dark:text-gray-400">
                Showing <span className="font-semibold">{startIdx + 1}</span>–<span className="font-semibold">{endIdx}</span> of <span className="font-semibold">{total}</span>
              </div>
              <div className="flex items-center gap-2 dark:text-white">
                <button
                  onClick={goPrev}
                  disabled={safePage <= 1}
                  className={`px-3 py-1.5 rounded-md border dark:border-gray-700 ${safePage <= 1 ? 'opacity-50 cursor-not-allowed' : 'hover:bg-gray-50 dark:hover:bg-gray-800'}`}
                >
                  Previous
                </button>
                <span className="text-sm text-gray-600 dark:text-gray-400">
                  Page <span className="font-semibold">{safePage}</span> / {totalPages}
                </span>
                <button
                  onClick={goNext}
                  disabled={safePage >= totalPages}
                  className={`px-3 py-1.5 rounded-md border dark:border-gray-700 ${safePage >= totalPages ? 'opacity-50 cursor-not-allowed' : 'hover:bg-gray-50 dark:hover:bg-gray-800 '}`}
                >
                  Next
                </button>
              </div>
            </div>

            {/* Cards */}
            <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
              {pageItems.map(p => (
                <SiteCard
                  key={p.name}
                  siteId={p.name}          // SiteCard self-fetches details
                  fallbackStatus={p.status ?? undefined}
                />
              ))}
            </div>

            {/* Pagination footer mirrors header for convenience */}
            <div className="flex items-center justify-between">
              <div className="text-sm text-gray-600 dark:text-gray-400">
                Showing <span className="font-semibold">{startIdx + 1}</span>–<span className="font-semibold">{endIdx}</span> of <span className="font-semibold">{total}</span>
              </div>
              <div className="flex items-center gap-2 dark:text-white">
                <button
                  onClick={goPrev}
                  disabled={safePage <= 1}
                  className={`px-3 py-1.5 rounded-md border dark:border-gray-700 ${safePage <= 1 ? 'opacity-50 cursor-not-allowed' : 'hover:bg-gray-50 dark:hover:bg-gray-800'}`}
                >
                  Previous
                </button>
                <span className="text-sm text-gray-600 dark:text-gray-400">
                  Page <span className="font-semibold">{safePage}</span> / {totalPages}
                </span>
                <button
                  onClick={goNext}
                  disabled={safePage >= totalPages}
                  className={`px-3 py-1.5 rounded-md border dark:border-gray-700 ${safePage >= totalPages ? 'opacity-50 cursor-not-allowed' : 'hover:bg-gray-50 dark:hover:bg-gray-800'}`}
                >
                  Next
                </button>
              </div>
            </div>
          </>
        )}
      </div>
    </DashboardLayout>
  );
};

export default SitesPage;