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import type { ModelState } from '../types';

interface ModelStatusProps {
  models: ModelState[];
}

const STATUS_COLOR: Record<ModelState['status'], string> = {
  pending: '#9e9e9e',
  downloading: '#1976d2',
  loading: '#f9a825',
  ready: '#388e3c',
  error: '#d32f2f',
};

const STATUS_LABEL: Record<ModelState['status'], string> = {
  pending: 'Pending',
  downloading: 'Downloading',
  loading: 'Loading',
  ready: 'Ready',
  error: 'Error',
};

function ProgressBar({ progress, color }: { progress: number; color: string }) {
  return (
    <div style={{
      height: '4px',
      background: 'var(--border)',
      borderRadius: '2px',
      overflow: 'hidden',
      marginTop: '4px',
    }}>
      <div style={{
        height: '100%',
        width: `${Math.round(progress * 100)}%`,
        background: color,
        borderRadius: '2px',
        transition: 'width 0.3s ease',
      }} />
    </div>
  );
}

function ModelRow({ model }: { model: ModelState }) {
  const color = STATUS_COLOR[model.status];
  const showProgress = model.status === 'downloading' || model.status === 'loading';

  return (
    <div style={{
      padding: '0.5rem 0.75rem',
      background: 'var(--bg-card)',
      border: '1px solid var(--border)',
      borderRadius: '6px',
      marginBottom: '0.4rem',
    }}>
      <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'space-between' }}>
        <span style={{
          fontFamily: "'SF Mono', 'Fira Code', 'Cascadia Code', monospace",
          fontSize: '0.78rem',
          color: 'var(--text)',
        }}>
          {model.name}
        </span>
        <span style={{
          fontSize: '0.72rem',
          fontFamily: 'system-ui, -apple-system, sans-serif',
          fontWeight: 600,
          color,
          display: 'flex',
          alignItems: 'center',
          gap: '0.3rem',
        }}>
          {model.status === 'ready' && (
            <span style={{ fontSize: '0.85rem' }}>{'\u2713'}</span>
          )}
          {model.status === 'error' && (
            <span style={{ fontSize: '0.85rem' }}>{'\u2717'}</span>
          )}
          {STATUS_LABEL[model.status]}
          {showProgress && (
            <span style={{ color: 'var(--text-secondary)', fontWeight: 400 }}>
              {Math.round(model.progress * 100)}%
            </span>
          )}
        </span>
      </div>
      {showProgress && <ProgressBar progress={model.progress} color={color} />}
      {model.status === 'error' && model.error && (
        <div style={{
          marginTop: '4px',
          fontSize: '0.72rem',
          color: '#d32f2f',
          fontFamily: 'system-ui, -apple-system, sans-serif',
        }}>
          {model.error}
        </div>
      )}
    </div>
  );
}

export default function ModelStatus({ models }: ModelStatusProps) {
  const coreModels = models.filter((model) => model.name !== 'expansion');
  const expansionModel = models.find((model) => model.name === 'expansion');
  const coreReady = coreModels.length > 0 && coreModels.every((model) => model.status === 'ready');
  const expansionReady = expansionModel?.status === 'ready';
  const expansionUnavailable = expansionModel?.status === 'error';

  return (
    <div style={{
      padding: '1rem',
      background: 'var(--bg-section)',
      border: '1px solid var(--border)',
      borderRadius: '8px',
      marginBottom: '1.5rem',
    }}>
      <div style={{
        display: 'flex',
        alignItems: 'center',
        justifyContent: 'space-between',
        marginBottom: '0.6rem',
      }}>
        <h3 style={{
          margin: 0,
          fontSize: '0.85rem',
          fontFamily: 'system-ui, -apple-system, sans-serif',
          fontWeight: 600,
          color: 'var(--text-secondary)',
          textTransform: 'uppercase',
          letterSpacing: '0.05em',
        }}>
          Models
        </h3>
        {coreReady && (
          <span style={{
            fontSize: '0.75rem',
            fontFamily: 'system-ui, -apple-system, sans-serif',
            color: '#388e3c',
            fontWeight: 600,
          }}>
            Search ready
          </span>
        )}
      </div>
      {!coreReady && (
        <p style={{
          margin: '0 0 0.5rem',
          fontSize: '0.75rem',
          fontFamily: 'system-ui, -apple-system, sans-serif',
          color: 'var(--text-secondary)',
          lineHeight: 1.4,
        }}>
          First load downloads several GB of model weights. Subsequent visits use the browser cache.
        </p>
      )}
      {coreReady && !expansionReady && !expansionUnavailable && (
        <p style={{
          margin: '0 0 0.5rem',
          fontSize: '0.75rem',
          fontFamily: 'system-ui, -apple-system, sans-serif',
          color: 'var(--text-secondary)',
          lineHeight: 1.4,
        }}>
          Embedding and reranker ready. Compact expansion model (single-file download) loading...
        </p>
      )}
      {coreReady && expansionUnavailable && (
        <p style={{
          margin: '0 0 0.5rem',
          fontSize: '0.75rem',
          fontFamily: 'system-ui, -apple-system, sans-serif',
          color: 'var(--text-secondary)',
          lineHeight: 1.4,
        }}>
          Expansion model unavailable. Search uses the original query directly.
        </p>
      )}
      {models.map(m => (
        <ModelRow key={m.name} model={m} />
      ))}
      {models.length === 0 && (
        <div style={{
          color: 'var(--text-muted)',
          fontSize: '0.85rem',
          fontFamily: 'system-ui, -apple-system, sans-serif',
        }}>
          No models configured.
        </div>
      )}
    </div>
  );
}