Studio Helpers

import studioData from '@/../_data/_studio.json'

type ImageSize = 'small' | 'medium' | 'large' | 'full'

type ImageResult = {
  url: string
  width: number
  height: number
}

// Matches studio's Dimensions type
interface Dimensions {
  w: number
  h: number
}

// Matches studio's MetaEntry type (subset used by helpers)
type MetaEntry = {
  o?: Dimensions // original dimensions {w, h}
  sm?: Dimensions // small thumbnail (300px width)
  md?: Dimensions // medium thumbnail (700px width)
  lg?: Dimensions // large thumbnail (1400px width)
  f?: Dimensions // full size (capped at 2560px width)
  c?: number // CDN index into _cdns array
}

// Matches studio's FullMeta type
interface FullMeta {
  _cdns?: string[]
  [key: string]: MetaEntry | string[] | undefined
}

const studio = studioData as FullMeta
const cdnUrls = studio._cdns || []

// Map size to studio key and suffix
const SIZE_MAP: Record<
  ImageSize,
  { key: 'sm' | 'md' | 'lg' | 'f'; suffix: string }
> = {
  small: { key: 'sm', suffix: '-sm' },
  medium: { key: 'md', suffix: '-md' },
  large: { key: 'lg', suffix: '-lg' },
  full: { key: 'f', suffix: '' },
}

// Check if an image entry is processed (has any thumbnail dimensions)
function isProcessed(entry: MetaEntry | undefined): boolean {
  if (!entry) return false
  return !!(entry.f || entry.lg || entry.md || entry.sm)
}

// Normalize src to get the studio lookup key (strip /images prefix and any size suffix)
function getStudioLookupKey(src: string): string {
  let key = src.startsWith('/') ? src : `/${src}`

  // Strip /images prefix if present
  if (key.startsWith('/images/')) {
    key = key.slice(7) // Remove '/images'
  }

  // Strip size suffix if present (e.g., -sm, -md, -lg)
  key = key.replace(/-(sm|md|lg)\.(jpg|jpeg|png|webp)$/i, '.$2')

  return key
}

// Get thumbnail path from original path
function getThumbnailPath(originalPath: string, size: ImageSize): string {
  const ext = originalPath.match(/\.\w+$/)?.[0] || '.jpg'
  const base = originalPath.replace(/\.\w+$/, '')
  const outputExt = ext.toLowerCase() === '.png' ? '.png' : '.jpg'
  const suffix = SIZE_MAP[size].suffix
  return `/images${base}${suffix}${outputExt}`
}

/**
 * Gets the image data for a specific size from the studio metadata.
 * Falls back to 'full' size if the requested size doesn't exist.
 *
 * @example
 * ```tsx
 * // Get large version, fallback to full if large doesn't exist
 * const image = getStudioImage('/portfolio/photo.jpg', 'large')
 * // Returns: { url: '/images/portfolio/photo-lg.jpg', width: 1400, height: 934 }
 *
 * // Get medium version, fallback to full if medium doesn't exist
 * const mediumImage = getStudioImage('/portfolio/photo.jpg', 'medium')
 * ```
 *
 * @param url - The original image URL to look up (should start with /)
 * @param size - The desired image size ('small', 'medium', 'large', 'full')
 * @returns Object with url, width, height, or undefined if no data found
 */
export function getStudioImage(
  url: string | undefined,
  size: ImageSize = 'large'
): ImageResult | undefined {
  if (!url) {
    return undefined
  }

  try {
    // Normalize URL to get lookup key (strips /images prefix and size suffixes)
    const lookupKey = getStudioLookupKey(url)

    // Get entry from studio data (exclude special keys)
    if (lookupKey.startsWith('_')) return undefined
    const value = studio[lookupKey]
    if (!value || Array.isArray(value)) return undefined
    const entry = value as MetaEntry

    // Get CDN URL if available
    const cdnUrl = entry.c !== undefined ? cdnUrls[entry.c] : undefined
    const entryIsProcessed = isProcessed(entry)

    // Get the size key
    const sizeConfig = SIZE_MAP[size]

    if (size === 'full' || !entryIsProcessed) {
      // Use original or full dimensions
      const fullDims = entry.f || entry.o
      if (!fullDims) return undefined

      // Return original/full URL
      const imageUrl = cdnUrl
        ? `${cdnUrl}${getThumbnailPath(lookupKey, 'full')}`
        : getThumbnailPath(lookupKey, 'full')

      return {
        url: imageUrl,
        width: fullDims.w,
        height: fullDims.h,
      }
    }

    // Try requested size, fall back to larger sizes, then full
    const fallbackOrder: Array<'sm' | 'md' | 'lg' | 'f'> = [
      'sm',
      'md',
      'lg',
      'f',
    ]
    const startIndex = Math.max(0, fallbackOrder.indexOf(sizeConfig.key))

    for (let i = startIndex; i < fallbackOrder.length; i++) {
      const key = fallbackOrder[i]
      if (!key) continue
      const sizeDims = entry[key]
      if (sizeDims) {
        const sizeForPath =
          key === 'sm'
            ? 'small'
            : key === 'md'
              ? 'medium'
              : key === 'lg'
                ? 'large'
                : 'full'
        const imageUrl = cdnUrl
          ? `${cdnUrl}${getThumbnailPath(lookupKey, sizeForPath)}`
          : getThumbnailPath(lookupKey, sizeForPath)

        return {
          url: imageUrl,
          width: sizeDims.w,
          height: sizeDims.h,
        }
      }
    }

    // No size found, try original
    if (entry.o) {
      const imageUrl = cdnUrl ? `${cdnUrl}${lookupKey}` : lookupKey
      return {
        url: imageUrl,
        width: entry.o.w,
        height: entry.o.h,
      }
    }

    return undefined
  } catch (error) {
    // Safe fallback on any error
    console.warn(`Failed to get studio image for ${url}:`, error)
    return undefined
  }
}

/**
 * Get the correct Studio URL for an image path.
 * Returns CDN URL if the image is in the cloud, otherwise returns the original path.
 *
 * @example
 * ```tsx
 * // Image in cloud returns CDN URL (defaults to 'large' size)
 * studioUrl('/images/hero-bg.png')
 * // Returns: 'https://speedwell-cdn.gallop.software/images/hero-bg-lg.jpg'
 *
 * // Specify a size
 * studioUrl('/images/hero-bg.png', 'medium')
 * // Returns: 'https://speedwell-cdn.gallop.software/images/hero-bg-md.jpg'
 *
 * // Image not in cloud returns original path
 * studioUrl('/images/local-only.png')
 * // Returns: '/images/local-only.png'
 *
 * // Works with or without /images prefix
 * studioUrl('/hero-bg.png')
 * studioUrl('/images/hero-bg.png')
 * ```
 *
 * @param src - The image path (e.g., '/images/hero-bg.png' or '/hero-bg.png')
 * @param size - The desired image size ('small', 'medium', 'large', 'full'). Defaults to 'large'.
 * @returns The resolved URL (CDN URL if in cloud, original path otherwise)
 */
export function studioUrl(src: string, size: ImageSize = 'large'): string {
  if (!src) return src

  // Normalize to get lookup key
  const lookupKey = getStudioLookupKey(src)

  // Get entry from studio data
  if (lookupKey.startsWith('_')) return src
  const value = studio[lookupKey]
  if (!value || Array.isArray(value)) return src
  const entry = value as MetaEntry

  // Get CDN URL if available
  const cdnUrl = entry.c !== undefined ? cdnUrls[entry.c] : undefined

  // Build the correct path
  const entryIsProcessed = isProcessed(entry)
  const baseUrl = cdnUrl || ''

  if (!entryIsProcessed) {
    // Not processed - use original path
    return cdnUrl ? `${cdnUrl}${lookupKey}` : src
  }

  // Try requested size, fall back to larger sizes, then full
  const sizeConfig = SIZE_MAP[size]
  const fallbackOrder: Array<'sm' | 'md' | 'lg' | 'f'> = ['sm', 'md', 'lg', 'f']
  const startIndex = Math.max(0, fallbackOrder.indexOf(sizeConfig.key))

  for (let i = startIndex; i < fallbackOrder.length; i++) {
    const key = fallbackOrder[i]
    if (!key) continue
    if (entry[key]) {
      const sizeForPath =
        key === 'sm'
          ? 'small'
          : key === 'md'
            ? 'medium'
            : key === 'lg'
              ? 'large'
              : 'full'
      const imagePath = getThumbnailPath(lookupKey, sizeForPath)
      return `${baseUrl}${imagePath}`
    }
  }

  // Fallback to full size path
  const imagePath = getThumbnailPath(lookupKey, 'full')
  return `${baseUrl}${imagePath}`
}