'use client';

import { useState, useEffect, useRef } from 'react';
import { useRouter, usePathname, useSearchParams } from 'next/navigation';
import SiteSelector from '@/components/dashboards/SiteSelector';
import SiteStatus from '@/components/dashboards/SiteStatus';
import KPI_Table from '@/components/dashboards/KPIStatus';
import DashboardLayout from './dashlayout';
import html2canvas from 'html2canvas';
import jsPDF from 'jspdf';
import dynamic from 'next/dynamic';
const EnergyLineChart = dynamic(() => import('@/components/dashboards/EnergyLineChart'), {
  ssr: false,
});

const MonthlyBarChart = dynamic(() => import('@/components/dashboards/MonthlyBarChart'), {
  ssr: false,
});

import { SiteName, SiteDetails, mockSiteData } from '@/types/SiteData';

const AdminDashboard = () => {
  const router = useRouter();
  const pathname = usePathname();
  const searchParams = useSearchParams();

  const siteParam = searchParams?.get('site');
  const validSiteNames: SiteName[] = ['Site A', 'Site B', 'Site C'];

  const [selectedSite, setSelectedSite] = useState<SiteName>(() => {
    if (siteParam && validSiteNames.includes(siteParam as SiteName)) {
      return siteParam as SiteName;
    }
    return 'Site A';
  });

  // Keep siteParam and selectedSite in sync
  useEffect(() => {
    if (
      siteParam &&
      validSiteNames.includes(siteParam as SiteName) &&
      siteParam !== selectedSite
    ) {
      setSelectedSite(siteParam as SiteName);
    }
  }, [siteParam, selectedSite]);

  // Update query string when site is changed manually
  const handleSiteChange = (newSite: SiteName) => {
    setSelectedSite(newSite);
    const newUrl = `${pathname}?site=${encodeURIComponent(newSite)}`;
    router.push(newUrl);
  };

  const currentSiteDetails: SiteDetails = mockSiteData[selectedSite] || {
    location: 'N/A',
    inverterProvider: 'N/A',
    emergencyContact: 'N/A',
    lastSyncTimestamp: 'N/A',
    consumptionData: [],
    generationData: [],
    systemStatus: 'N/A',
    temperature: 'N/A',
    solarPower: 0,
    realTimePower: 0,
    installedPower: 0,
  };

  const handleCSVExport = () => {
    alert('Exported raw data to CSV (mock)');
  };

  const energyChartRef = useRef(null);
  const monthlyChartRef = useRef(null);

  const handlePDFExport = async () => {
  const doc = new jsPDF('p', 'mm', 'a4'); // portrait, millimeters, A4
  const chartRefs = [
    { ref: energyChartRef, title: 'Energy Line Chart' },
    { ref: monthlyChartRef, title: 'Monthly Energy Yield' }
  ];

  let yOffset = 10;

  for (const chart of chartRefs) {
    if (!chart.ref.current) continue;

    // Capture chart as image
    const canvas = await html2canvas(chart.ref.current, {
      scale: 2, // Higher scale for better resolution
    });

    const imgData = canvas.toDataURL('image/png');
    const imgProps = doc.getImageProperties(imgData);

    const pdfWidth = doc.internal.pageSize.getWidth() - 20; // 10 margin each side
    const imgHeight = (imgProps.height * pdfWidth) / imgProps.width;

    // Add title and image
    doc.setFontSize(14);
    doc.text(chart.title, 10, yOffset);
    yOffset += 6; // Space between title and chart

    // If content will overflow page, add a new page
    if (yOffset + imgHeight > doc.internal.pageSize.getHeight()) {
      doc.addPage();
      yOffset = 10;
    }

    doc.addImage(imgData, 'PNG', 10, yOffset, pdfWidth, imgHeight);
    yOffset += imgHeight + 10; // Update offset for next chart
  }

  doc.save('dashboard_charts.pdf');
};

  return (
    <DashboardLayout>
      <div className="px-6 space-y-6">
        <h1 className="text-lg font-semibold">Admin Dashboard</h1>

        <div className="grid md:grid-cols-2 gap-6">
          <div className="space-y-4">
            <SiteSelector
              selectedSite={selectedSite}
              setSelectedSite={handleSiteChange}
            />
            <SiteStatus
              selectedSite={selectedSite}
              location={currentSiteDetails.location}
              inverterProvider={currentSiteDetails.inverterProvider}
              emergencyContact={currentSiteDetails.emergencyContact}
              lastSyncTimestamp={currentSiteDetails.lastSyncTimestamp}
            />
          </div>

          <div>
            <KPI_Table siteData={currentSiteDetails} />
          </div>
        </div>

        <div className="grid md:grid-cols-2 gap-6 lg:flex-col justify-center">
          <div ref={energyChartRef} className="pb-5">
            <EnergyLineChart
              consumptionData={currentSiteDetails.consumptionData}
              generationData={currentSiteDetails.generationData}
            />
          </div>
          <div ref={monthlyChartRef} className="pb-5">
            <MonthlyBarChart siteData={currentSiteDetails} />
          </div>
        </div>

        <div className="flex flex-col md:flex-row gap-4 justify-center">
          <button onClick={handleCSVExport} className="text-sm lg:text-lg btn-primary">
            Export Raw Data to CSV
          </button>
          <button onClick={handlePDFExport} className="text-sm lg:text-lg btn-primary">
            Export Chart Images to PDF
          </button>
        </div>
      </div>
    </DashboardLayout>
  );
};

export default AdminDashboard;