import { useState } from 'react'

interface RepoAvatarProps {
  ownerName: string
  name: string
  avatarUrl?: string
  size?: number
  className?: string
}

// Consistent color per repo name (not random on each render)
function hashColor(name: string): string {
  const palette = [
    '#0052CC', '#00875A', '#FF5630', '#FF8B00',
    '#6554C0', '#00B8D9', '#36B37E', '#253858',
  ]
  let hash = 0
  for (let i = 0; i < name.length; i++) hash = (hash * 31 + name.charCodeAt(i)) | 0
  return palette[Math.abs(hash) % palette.length]
}

export function RepoAvatar({ ownerName, name, avatarUrl, size = 32, className = '' }: RepoAvatarProps) {
  const [imgError, setImgError] = useState(false)

  // Use provided avatarUrl; fall back to the API endpoint (which 404s if not set → onError fires)
  const src = avatarUrl || `/api/v1/repos/${ownerName}/${name}/avatar`
  const letter = (name[0] ?? '?').toUpperCase()
  const bg = hashColor(name)
  const fontSize = Math.round(size * 0.42)

  const style = { width: size, height: size, minWidth: size, minHeight: size, fontSize }

  if (!imgError) {
    return (
      <img
        src={src}
        alt={name}
        style={style}
        className={`rounded object-cover shrink-0 ${className}`}
        onError={() => setImgError(true)}
      />
    )
  }

  return (
    <div
      style={{ ...style, backgroundColor: bg }}
      className={`rounded flex items-center justify-center text-white font-bold select-none shrink-0 ${className}`}
    >
      {letter}
    </div>
  )
}
