// ---------------------------------------------------------------------------
// Client-side folder validation
// ---------------------------------------------------------------------------

import { REQUIRED_TEXTURES, TEXTURE_EXTENSIONS } from '@/lib/constants'
import type { TextureFile } from '@/lib/client-types'

const TEXTURE_EXT_ARRAY = [...TEXTURE_EXTENSIONS]

function getTextureType(filename: string): string | null {
  const name = filename.toLowerCase().replace(/\.[^.]+$/, '')
  if ((REQUIRED_TEXTURES as readonly string[]).includes(name)) return name
  return null
}

export function validateFolder(files: File[]): {
  model?: File
  textures: TextureFile[]
  errors: string[]
  warnings: string[]
} {
  const result: {
    model?: File
    textures: TextureFile[]
    errors: string[]
    warnings: string[]
  } = {
    textures: [],
    errors: [],
    warnings: [],
  }

  const modelFiles = files.filter((f) => {
    const name = f.name.toLowerCase()
    return name === 'model.glb' || name === 'model.gltf'
  })

  if (modelFiles.length === 0) {
    result.errors.push('model.glb ou model.gltf manquant (obligatoire)')
  } else {
    result.model = modelFiles[0]
  }

  const textureFiles = files.filter((f) => {
    const ext = f.name.slice(f.name.lastIndexOf('.')).toLowerCase()
    return TEXTURE_EXT_ARRAY.includes(ext) && getTextureType(f.name) !== null
  })

  for (const tf of textureFiles) {
    result.textures.push({ name: tf.name, file: tf })
  }

  const foundTextures = new Set(
    result.textures.map((t) => t.name.toLowerCase().replace(/\.[^.]+$/, '')),
  )
  for (const req of REQUIRED_TEXTURES) {
    if (!foundTextures.has(req)) {
      result.warnings.push(`${req}.webp/png/jpg manquant`)
    }
  }

  return result
}