import { useMemo } from 'react';
import Plot from 'react-plotly.js';
import { TrendingUp, TrendingDown, Minus } from 'lucide-react';

interface Run {
  run_id: number;
  name: string;
  source: 'FEA' | 'NN';
  trial_count: number;
  best_value: number | null;
  avg_value: number | null;
  first_trial: string | null;
  last_trial: string | null;
}

interface PlotlyRunComparisonProps {
  runs: Run[];
  height?: number;
}

export function PlotlyRunComparison({ runs, height = 400 }: PlotlyRunComparisonProps) {
  const chartData = useMemo(() => {
    if (runs.length === 0) return null;

    // Separate FEA and NN runs
    const feaRuns = runs.filter(r => r.source === 'FEA');
    const nnRuns = runs.filter(r => r.source === 'NN');

    // Create bar chart for trial counts
    const trialCountData = {
      x: runs.map(r => r.name),
      y: runs.map(r => r.trial_count),
      type: 'bar' as const,
      name: 'Trial Count',
      marker: {
        color: runs.map(r => r.source === 'NN' ? 'rgba(147, 51, 234, 0.8)' : 'rgba(59, 130, 246, 0.8)'),
        line: { color: runs.map(r => r.source === 'NN' ? 'rgb(147, 51, 234)' : 'rgb(59, 130, 246)'), width: 1 }
      },
      hovertemplate: '<b>%{x}</b><br>Trials: %{y}<extra></extra>'
    };

    // Create line chart for best values
    const bestValueData = {
      x: runs.map(r => r.name),
      y: runs.map(r => r.best_value),
      type: 'scatter' as const,
      mode: 'lines+markers' as const,
      name: 'Best Value',
      yaxis: 'y2',
      line: { color: 'rgba(16, 185, 129, 1)', width: 2 },
      marker: { size: 8, color: 'rgba(16, 185, 129, 1)' },
      hovertemplate: '<b>%{x}</b><br>Best: %{y:.4e}<extra></extra>'
    };

    return { trialCountData, bestValueData, feaRuns, nnRuns };
  }, [runs]);

  // Calculate statistics
  const stats = useMemo(() => {
    if (runs.length === 0) return null;

    const totalTrials = runs.reduce((sum, r) => sum + r.trial_count, 0);
    const feaTrials = runs.filter(r => r.source === 'FEA').reduce((sum, r) => sum + r.trial_count, 0);
    const nnTrials = runs.filter(r => r.source === 'NN').reduce((sum, r) => sum + r.trial_count, 0);

    const bestValues = runs.map(r => r.best_value).filter((v): v is number => v !== null);
    const overallBest = bestValues.length > 0 ? Math.min(...bestValues) : null;

    // Calculate improvement from first FEA run to overall best
    const feaRuns = runs.filter(r => r.source === 'FEA');
    const firstFEA = feaRuns.length > 0 ? feaRuns[0].best_value : null;
    const improvement = firstFEA && overallBest ? ((firstFEA - overallBest) / Math.abs(firstFEA)) * 100 : null;

    return {
      totalTrials,
      feaTrials,
      nnTrials,
      overallBest,
      improvement,
      totalRuns: runs.length,
      feaRuns: runs.filter(r => r.source === 'FEA').length,
      nnRuns: runs.filter(r => r.source === 'NN').length
    };
  }, [runs]);

  if (!chartData || !stats) {
    return (
      <div className="flex items-center justify-center h-64 text-dark-400">
        No run data available
      </div>
    );
  }

  return (
    <div className="space-y-4">
      {/* Stats Summary */}
      <div className="grid grid-cols-2 md:grid-cols-4 lg:grid-cols-6 gap-3">
        <div className="bg-dark-750 rounded-lg p-3">
          <div className="text-xs text-dark-400 mb-1">Total Runs</div>
          <div className="text-xl font-bold text-white">{stats.totalRuns}</div>
        </div>
        <div className="bg-dark-750 rounded-lg p-3">
          <div className="text-xs text-dark-400 mb-1">Total Trials</div>
          <div className="text-xl font-bold text-white">{stats.totalTrials}</div>
        </div>
        <div className="bg-dark-750 rounded-lg p-3">
          <div className="text-xs text-dark-400 mb-1">FEA Trials</div>
          <div className="text-xl font-bold text-blue-400">{stats.feaTrials}</div>
        </div>
        <div className="bg-dark-750 rounded-lg p-3">
          <div className="text-xs text-dark-400 mb-1">NN Trials</div>
          <div className="text-xl font-bold text-purple-400">{stats.nnTrials}</div>
        </div>
        <div className="bg-dark-750 rounded-lg p-3">
          <div className="text-xs text-dark-400 mb-1">Best Value</div>
          <div className="text-xl font-bold text-green-400">
            {stats.overallBest !== null ? stats.overallBest.toExponential(3) : 'N/A'}
          </div>
        </div>
        <div className="bg-dark-750 rounded-lg p-3">
          <div className="text-xs text-dark-400 mb-1">Improvement</div>
          <div className="text-xl font-bold text-primary-400 flex items-center gap-1">
            {stats.improvement !== null ? (
              <>
                {stats.improvement > 0 ? <TrendingDown className="w-4 h-4" /> :
                 stats.improvement < 0 ? <TrendingUp className="w-4 h-4" /> :
                 <Minus className="w-4 h-4" />}
                {Math.abs(stats.improvement).toFixed(1)}%
              </>
            ) : 'N/A'}
          </div>
        </div>
      </div>

      {/* Chart */}
      <Plot
        data={[chartData.trialCountData, chartData.bestValueData]}
        layout={{
          height,
          margin: { l: 60, r: 60, t: 40, b: 100 },
          paper_bgcolor: 'transparent',
          plot_bgcolor: 'transparent',
          font: { color: '#9ca3af', size: 11 },
          showlegend: true,
          legend: {
            orientation: 'h',
            y: 1.12,
            x: 0.5,
            xanchor: 'center',
            bgcolor: 'transparent'
          },
          xaxis: {
            tickangle: -45,
            gridcolor: 'rgba(75, 85, 99, 0.3)',
            linecolor: 'rgba(75, 85, 99, 0.5)',
            tickfont: { size: 10 }
          },
          yaxis: {
            title: { text: 'Trial Count' },
            gridcolor: 'rgba(75, 85, 99, 0.3)',
            linecolor: 'rgba(75, 85, 99, 0.5)',
            zeroline: false
          },
          yaxis2: {
            title: { text: 'Best Value' },
            overlaying: 'y',
            side: 'right',
            gridcolor: 'rgba(75, 85, 99, 0.1)',
            linecolor: 'rgba(75, 85, 99, 0.5)',
            zeroline: false,
            tickformat: '.2e'
          },
          bargap: 0.3,
          hovermode: 'x unified'
        }}
        config={{
          displayModeBar: true,
          displaylogo: false,
          modeBarButtonsToRemove: ['select2d', 'lasso2d', 'autoScale2d']
        }}
        className="w-full"
        useResizeHandler
        style={{ width: '100%' }}
      />

      {/* Runs Table */}
      <div className="overflow-x-auto">
        <table className="w-full text-sm">
          <thead>
            <tr className="border-b border-dark-600">
              <th className="text-left py-2 px-3 text-dark-400 font-medium">Run Name</th>
              <th className="text-left py-2 px-3 text-dark-400 font-medium">Source</th>
              <th className="text-right py-2 px-3 text-dark-400 font-medium">Trials</th>
              <th className="text-right py-2 px-3 text-dark-400 font-medium">Best Value</th>
              <th className="text-right py-2 px-3 text-dark-400 font-medium">Avg Value</th>
              <th className="text-left py-2 px-3 text-dark-400 font-medium">Duration</th>
            </tr>
          </thead>
          <tbody>
            {runs.map((run) => {
              // Calculate duration if times available
              let duration = '-';
              if (run.first_trial && run.last_trial) {
                const start = new Date(run.first_trial);
                const end = new Date(run.last_trial);
                const diffMs = end.getTime() - start.getTime();
                const diffMins = Math.round(diffMs / 60000);
                if (diffMins < 60) {
                  duration = `${diffMins}m`;
                } else {
                  const hours = Math.floor(diffMins / 60);
                  const mins = diffMins % 60;
                  duration = `${hours}h ${mins}m`;
                }
              }

              return (
                <tr key={run.run_id} className="border-b border-dark-700 hover:bg-dark-750">
                  <td className="py-2 px-3 font-mono text-white">{run.name}</td>
                  <td className="py-2 px-3">
                    <span className={`px-2 py-0.5 rounded text-xs ${
                      run.source === 'NN'
                        ? 'bg-purple-500/20 text-purple-400'
                        : 'bg-blue-500/20 text-blue-400'
                    }`}>
                      {run.source}
                    </span>
                  </td>
                  <td className="py-2 px-3 text-right font-mono text-white">{run.trial_count}</td>
                  <td className="py-2 px-3 text-right font-mono text-green-400">
                    {run.best_value !== null ? run.best_value.toExponential(4) : '-'}
                  </td>
                  <td className="py-2 px-3 text-right font-mono text-dark-300">
                    {run.avg_value !== null ? run.avg_value.toExponential(4) : '-'}
                  </td>
                  <td className="py-2 px-3 text-dark-400">{duration}</td>
                </tr>
              );
            })}
          </tbody>
        </table>
      </div>
    </div>
  );
}

export default PlotlyRunComparison;