import { Link } from 'react-router-dom'
import { GEN1, GEN2, GEN3, getAncestorAtPath, formatManualAncestorDisplay } from '../lib/pedigree'

function AncestorNodeView({ path, label, ancestors }) {
  const node = getAncestorAtPath(ancestors, path)

  if (!node) {
    return (
      <div className="flex h-16 w-full min-w-0 flex-col items-start justify-center gap-0.5 overflow-hidden rounded-md border border-border bg-surface-sunken px-3 py-2">
        <span className="w-full truncate font-body text-xs text-text-secondary">{label}</span>
        <span className="w-full truncate font-body text-sm text-text-secondary italic">Unknown</span>
      </div>
    )
  }

  if (node.id != null) {
    return (
      <Link
        to={`/herd/${node.id}`}
        className="flex h-16 w-full min-w-0 flex-col items-start justify-center gap-0.5 overflow-hidden rounded-md border border-border bg-surface-raised px-3 py-2 hover:border-accent focus:outline-none focus:ring-2 focus:ring-accent"
      >
        <span className="w-full truncate font-body text-xs text-text-secondary">{label}</span>
        <span className="w-full truncate font-body text-sm text-text-primary">
          {node.name}
          {node.farm ? ` (${node.farm})` : ''}
        </span>
        {node.ear_number ? (
          <span className="w-full truncate font-body text-xs text-text-secondary">Ear #{node.ear_number}</span>
        ) : null}
      </Link>
    )
  }

  return (
    <div className="flex h-16 w-full min-w-0 flex-col items-start justify-center gap-0.5 overflow-hidden rounded-md border border-border bg-surface-sunken px-3 py-2">
      <span className="w-full truncate font-body text-xs text-text-secondary">{label}</span>
      <span className="w-full truncate font-body text-sm text-text-secondary italic">
        {formatManualAncestorDisplay(node.name)}
      </span>
    </div>
  )
}

function Generation({ entries, ancestors }) {
  return (
    <div className="flex min-w-0 flex-1 flex-col justify-around gap-3">
      {entries.map(({ path, slot, label }) => (
        <AncestorNodeView key={slot} path={path} label={label} ancestors={ancestors} />
      ))}
    </div>
  )
}

// `generations` controls how many ancestor columns to render. The detail page
// uses 2 (parents + grandparents) to keep the inline tree compact; the full
// 3-generation tree lives on the dedicated print page.
function PedigreeTreeReadOnly({ subjectName, ancestors, generations = 3 }) {
  // Each generation column is ~176px (incl. gap); narrower min-width for fewer
  // generations lets the tree fit its column without horizontal scrolling.
  const minWidth = generations >= 3 ? 720 : 544

  return (
    // The scroll container fills (and shrinks with) its column; the tree scrolls
    // horizontally inside it rather than forcing the page wider and pushing the
    // timeline column off-screen.
    <div className="w-full overflow-x-auto p-4">
      <div className="flex items-center gap-4" style={{ minWidth }}>
        <div className="flex h-16 w-28 shrink-0 items-center justify-center rounded-md border-2 border-accent bg-surface px-3 text-center">
          <span className="truncate font-body text-sm font-medium text-text-primary">{subjectName}</span>
        </div>
        <Generation entries={GEN1} ancestors={ancestors} />
        {generations >= 2 && <Generation entries={GEN2} ancestors={ancestors} />}
        {generations >= 3 && <Generation entries={GEN3} ancestors={ancestors} />}
      </div>
    </div>
  )
}

export default PedigreeTreeReadOnly