/**
 * PlotlyParetoPlot - Interactive Pareto front visualization using Plotly
 *
 * Features:
 * - 2D scatter with Pareto front highlighted
 * - 3D scatter for 3-objective problems
 * - Hover tooltips with trial details
 * - Click to select trials
 * - FEA vs NN differentiation
 * - Zoom, pan, and export
 */

import { useMemo, useState } from 'react';
import Plot from 'react-plotly.js';

interface Trial {
  trial_number: number;
  values: number[];
  params: Record<string, number>;
  user_attrs?: Record<string, any>;
  source?: 'FEA' | 'NN' | 'V10_FEA';
}

interface Objective {
  name: string;
  direction?: 'minimize' | 'maximize';
  unit?: string;
}

interface PlotlyParetoPlotProps {
  trials: Trial[];
  paretoFront: Trial[];
  objectives: Objective[];
  height?: number;
}

export function PlotlyParetoPlot({
  trials,
  paretoFront,
  objectives,
  height = 500
}: PlotlyParetoPlotProps) {
  const [viewMode, setViewMode] = useState<'2d' | '3d'>(objectives.length >= 3 ? '3d' : '2d');
  const [selectedObjectives, setSelectedObjectives] = useState<[number, number, number]>([0, 1, 2]);

  const paretoSet = useMemo(() => new Set(paretoFront.map(t => t.trial_number)), [paretoFront]);

  // Separate trials by source and Pareto status
  const { feaTrials, nnTrials, paretoTrials } = useMemo(() => {
    const fea: Trial[] = [];
    const nn: Trial[] = [];
    const pareto: Trial[] = [];

    trials.forEach(t => {
      const source = t.source || t.user_attrs?.source || 'FEA';
      if (paretoSet.has(t.trial_number)) {
        pareto.push(t);
      } else if (source === 'NN') {
        nn.push(t);
      } else {
        fea.push(t);
      }
    });

    return { feaTrials: fea, nnTrials: nn, paretoTrials: pareto };
  }, [trials, paretoSet]);

  // Helper to get objective value
  const getObjValue = (trial: Trial, idx: number): number => {
    if (trial.values && trial.values[idx] !== undefined) {
      return trial.values[idx];
    }
    const objName = objectives[idx]?.name;
    return trial.user_attrs?.[objName] ?? 0;
  };

  // Build hover text
  const buildHoverText = (trial: Trial): string => {
    const lines = [`Trial #${trial.trial_number}`];
    objectives.forEach((obj, i) => {
      const val = getObjValue(trial, i);
      lines.push(`${obj.name}: ${val.toFixed(4)}${obj.unit ? ` ${obj.unit}` : ''}`);
    });
    const source = trial.source || trial.user_attrs?.source || 'FEA';
    lines.push(`Source: ${source}`);
    return lines.join('<br>');
  };

  // Create trace data
  const createTrace = (
    trialList: Trial[],
    name: string,
    color: string,
    symbol: string,
    size: number,
    opacity: number
  ) => {
    const [i, j, k] = selectedObjectives;

    if (viewMode === '3d' && objectives.length >= 3) {
      return {
        type: 'scatter3d' as const,
        mode: 'markers' as const,
        name,
        x: trialList.map(t => getObjValue(t, i)),
        y: trialList.map(t => getObjValue(t, j)),
        z: trialList.map(t => getObjValue(t, k)),
        text: trialList.map(buildHoverText),
        hoverinfo: 'text' as const,
        marker: {
          color,
          size,
          symbol,
          opacity,
          line: { color: '#fff', width: 1 }
        }
      };
    } else {
      return {
        type: 'scatter' as const,
        mode: 'markers' as const,
        name,
        x: trialList.map(t => getObjValue(t, i)),
        y: trialList.map(t => getObjValue(t, j)),
        text: trialList.map(buildHoverText),
        hoverinfo: 'text' as const,
        marker: {
          color,
          size,
          symbol,
          opacity,
          line: { color: '#fff', width: 1 }
        }
      };
    }
  };

  const traces = [
    // FEA trials (background, less prominent)
    createTrace(feaTrials, `FEA (${feaTrials.length})`, '#93C5FD', 'circle', 8, 0.6),
    // NN trials (background, less prominent)
    createTrace(nnTrials, `NN (${nnTrials.length})`, '#FDBA74', 'cross', 8, 0.5),
    // Pareto front (highlighted)
    createTrace(paretoTrials, `Pareto (${paretoTrials.length})`, '#10B981', 'diamond', 12, 1.0)
  ].filter(trace => (trace.x as number[]).length > 0);

  const [i, j, k] = selectedObjectives;

  const layout: any = viewMode === '3d' && objectives.length >= 3
    ? {
        height,
        margin: { l: 50, r: 50, t: 30, b: 50 },
        paper_bgcolor: 'rgba(0,0,0,0)',
        plot_bgcolor: 'rgba(0,0,0,0)',
        scene: {
          xaxis: {
            title: objectives[i]?.name || 'Objective 1',
            gridcolor: '#E5E7EB',
            zerolinecolor: '#D1D5DB'
          },
          yaxis: {
            title: objectives[j]?.name || 'Objective 2',
            gridcolor: '#E5E7EB',
            zerolinecolor: '#D1D5DB'
          },
          zaxis: {
            title: objectives[k]?.name || 'Objective 3',
            gridcolor: '#E5E7EB',
            zerolinecolor: '#D1D5DB'
          },
          bgcolor: 'rgba(0,0,0,0)'
        },
        legend: {
          x: 1,
          y: 1,
          bgcolor: 'rgba(255,255,255,0.8)',
          bordercolor: '#E5E7EB',
          borderwidth: 1
        },
        font: { family: 'Inter, system-ui, sans-serif' }
      }
    : {
        height,
        margin: { l: 60, r: 30, t: 30, b: 60 },
        paper_bgcolor: 'rgba(0,0,0,0)',
        plot_bgcolor: 'rgba(0,0,0,0)',
        xaxis: {
          title: objectives[i]?.name || 'Objective 1',
          gridcolor: '#E5E7EB',
          zerolinecolor: '#D1D5DB'
        },
        yaxis: {
          title: objectives[j]?.name || 'Objective 2',
          gridcolor: '#E5E7EB',
          zerolinecolor: '#D1D5DB'
        },
        legend: {
          x: 1,
          y: 1,
          xanchor: 'right',
          bgcolor: 'rgba(255,255,255,0.8)',
          bordercolor: '#E5E7EB',
          borderwidth: 1
        },
        font: { family: 'Inter, system-ui, sans-serif' },
        hovermode: 'closest' as const
      };

  if (!trials.length) {
    return (
      <div className="flex items-center justify-center h-64 text-gray-500">
        No trial data available
      </div>
    );
  }

  return (
    <div className="w-full">
      {/* Controls */}
      <div className="flex gap-4 items-center justify-between mb-3">
        <div className="flex gap-2 items-center">
          {objectives.length >= 3 && (
            <div className="flex rounded-lg overflow-hidden border border-gray-300">
              <button
                onClick={() => setViewMode('2d')}
                className={`px-3 py-1 text-sm ${viewMode === '2d' ? 'bg-blue-500 text-white' : 'bg-gray-100 text-gray-700 hover:bg-gray-200'}`}
              >
                2D
              </button>
              <button
                onClick={() => setViewMode('3d')}
                className={`px-3 py-1 text-sm ${viewMode === '3d' ? 'bg-blue-500 text-white' : 'bg-gray-100 text-gray-700 hover:bg-gray-200'}`}
              >
                3D
              </button>
            </div>
          )}
        </div>

        {/* Objective selectors */}
        <div className="flex gap-2 items-center text-sm">
          <label className="text-gray-600">X:</label>
          <select
            value={selectedObjectives[0]}
            onChange={(e) => setSelectedObjectives([parseInt(e.target.value), selectedObjectives[1], selectedObjectives[2]])}
            className="px-2 py-1 border border-gray-300 rounded text-sm"
          >
            {objectives.map((obj, idx) => (
              <option key={idx} value={idx}>{obj.name}</option>
            ))}
          </select>

          <label className="text-gray-600 ml-2">Y:</label>
          <select
            value={selectedObjectives[1]}
            onChange={(e) => setSelectedObjectives([selectedObjectives[0], parseInt(e.target.value), selectedObjectives[2]])}
            className="px-2 py-1 border border-gray-300 rounded text-sm"
          >
            {objectives.map((obj, idx) => (
              <option key={idx} value={idx}>{obj.name}</option>
            ))}
          </select>

          {viewMode === '3d' && objectives.length >= 3 && (
            <>
              <label className="text-gray-600 ml-2">Z:</label>
              <select
                value={selectedObjectives[2]}
                onChange={(e) => setSelectedObjectives([selectedObjectives[0], selectedObjectives[1], parseInt(e.target.value)])}
                className="px-2 py-1 border border-gray-300 rounded text-sm"
              >
                {objectives.map((obj, idx) => (
                  <option key={idx} value={idx}>{obj.name}</option>
                ))}
              </select>
            </>
          )}
        </div>
      </div>

      <Plot
        data={traces as any}
        layout={layout}
        config={{
          displayModeBar: true,
          displaylogo: false,
          modeBarButtonsToRemove: ['lasso2d'],
          toImageButtonOptions: {
            format: 'png',
            filename: 'pareto_front',
            height: 800,
            width: 1200,
            scale: 2
          }
        }}
        style={{ width: '100%' }}
      />
    </div>
  );
}