// src/components/AnalysisProgress.jsx

import { useEffect, useState } from 'react';

const STEPS = [
  {
    key: 'frames',
    label: 'Extracting Frames',
    desc: 'Sampling video at 1 fps for visual analysis',
    icon: '🎞️',
    weight: 20,
  },
  {
    key: 'audio',
    label: 'Analyzing Audio',
    desc: 'Running MFCCs + spectral deepfake detection',
    icon: '🎙️',
    weight: 25,
  },
  {
    key: 'lipsync',
    label: 'Lip-Sync Check',
    desc: 'Aligning phoneme boundaries with lip motion',
    icon: '👄',
    weight: 25,
  },
  {
    key: 'fusion',
    label: 'Multimodal Fusion',
    desc: 'Combining modality scores via learned weights',
    icon: '⚡',
    weight: 20,
  },
  {
    key: 'done',
    label: 'Generating Report',
    desc: 'Producing Grad-CAM heatmaps & sync profile',
    icon: '📊',
    weight: 10,
  },
];

function getStepState(stepKey, currentKey) {
  const currentIdx = STEPS.findIndex((s) => s.key === currentKey);
  const stepIdx    = STEPS.findIndex((s) => s.key === stepKey);
  if (stepIdx < currentIdx) return 'completed';
  if (stepIdx === currentIdx) return 'active';
  return 'waiting';
}

function getProgress(currentKey) {
  const idx = STEPS.findIndex((s) => s.key === currentKey);
  if (idx < 0) return 0;
  const completedWeight = STEPS.slice(0, idx).reduce((sum, s) => sum + s.weight, 0);
  const activeWeight    = STEPS[idx].weight * 0.5; // half-credit for active step
  return Math.round(completedWeight + activeWeight);
}

export default function AnalysisProgress({ currentStep, filename }) {
  const [displayProgress, setDisplayProgress] = useState(0);
  const targetProgress = currentStep === 'done' ? 100 : getProgress(currentStep);

  useEffect(() => {
    const timer = setTimeout(() => setDisplayProgress(targetProgress), 50);
    return () => clearTimeout(timer);
  }, [targetProgress]);

  return (
    <div className="progress-wrapper glass-card animate-scale">
      {/* Header */}
      <div className="progress-header">
        <span aria-hidden="true" style={{ fontSize: '2rem' }}>🔬</span>
        <h3>Analyzing Video</h3>
        {filename && (
          <p style={{ fontSize: '0.8rem', color: 'var(--text-muted)', marginTop: 4 }}>
            {filename}
          </p>
        )}
      </div>

      {/* Steps */}
      <ol className="progress-steps" aria-label="Analysis progress steps">
        {STEPS.map((step) => {
          const state = getStepState(step.key, currentStep);
          return (
            <li
              key={step.key}
              className={`progress-step ${state}`}
              aria-current={state === 'active' ? 'step' : undefined}
            >
              {/* Step icon */}
              <div className={`step-icon ${state}`} aria-hidden="true">
                {state === 'completed' ? '✓' : state === 'active' ? (
                  <span className="spinner" style={{ width: 16, height: 16 }} />
                ) : (
                  step.icon
                )}
              </div>

              {/* Text */}
              <div className="step-text">
                <div className="step-label">{step.label}</div>
                <div className="step-desc">{step.desc}</div>
              </div>

              {/* Status */}
              <span className={`step-status ${state}`} aria-label={`Status: ${state}`}>
                {state === 'completed' && 'Done'}
                {state === 'active' && 'Running'}
                {state === 'waiting' && 'Queued'}
              </span>
            </li>
          );
        })}
      </ol>

      {/* Overall progress bar */}
      <div className="overall-progress" aria-label="Overall progress">
        <div className="progress-bar-label">
          <span>Overall Progress</span>
          <span aria-live="polite">{displayProgress}%</span>
        </div>
        <div
          className="progress-bar-track"
          role="progressbar"
          aria-valuenow={displayProgress}
          aria-valuemin={0}
          aria-valuemax={100}
        >
          <div
            className="progress-bar-fill"
            style={{ width: `${displayProgress}%` }}
          />
        </div>
      </div>
    </div>
  );
}