import { ASSET_FAMILIES } from './asset-naming'
import type { AssetCategory, FileChange, PreparedAssetSummary } from './types'

const ASSET_SECTION_ORDER: AssetCategory[] = [...ASSET_FAMILIES, 'assets']

function getChangePrefix(change: FileChange) {
  if (change === 'new') return '✅'
  if (change === 'changed') return '🔄'
  return null
}

function addGroupedAssetLine(
  grouped: Map<AssetCategory, string[]>,
  category: AssetCategory,
  line: string,
) {
  const current = grouped.get(category) || []
  current.push(line)
  grouped.set(category, current)
}

/**
 * Build a formatted commit message based on the upload context.
 *
 * Symbols:
 * - ✅ = new file
 * - 🔄 = modified file
 * - ❌ = deleted file
 * - Unchanged files are omitted entirely
 */
export function buildCommitMessage(
  folderName: string,
  modelFilename: string,
  assetSummaries: PreparedAssetSummary[],
  isReplace: boolean,
  fileChanges: Map<string, FileChange>,
  deletedFileNames: string[],
): string {
  const title = isReplace
    ? `update: upload-gltf update -> ${folderName}`
    : `update: upload-gltf add a new model -> ${folderName}`

  const lines: string[] = [title, '']

  const modelSummary = assetSummaries.find((asset) => asset.kind === 'model')
  const modelChange = fileChanges.get(modelFilename.toLowerCase())
  if (modelChange === 'new') {
    lines.push('📦 Model')
    lines.push(`  ✅ ${modelFilename}${modelSummary?.compressed ? ' (compressed)' : ''}`)
  } else if (modelChange === 'changed') {
    lines.push('📦 Model')
    lines.push(`  🔄 ${modelFilename}${modelSummary?.compressed ? ' (compressed)' : ''}`)
  } else if (modelChange === 'unchanged') {
    lines.push('📦 Model')
    lines.push(`  ↔️ ${modelFilename}${modelSummary?.compressed ? ' (compressed)' : ' (inchange)'}`)
  }

  const grouped = new Map<AssetCategory, string[]>()

  for (const asset of assetSummaries) {
    if (asset.kind === 'model' || !asset.category) continue

    const change = fileChanges.get(asset.filename.toLowerCase())
    if (!change) continue

    const prefix = getChangePrefix(change)
    if (!prefix) continue

    addGroupedAssetLine(
      grouped,
      asset.category,
      `  ${prefix} ${asset.filename}${asset.compressed ? ' (compressed)' : ''}`,
    )
  }

  const sectionTitles: Record<AssetCategory, string> = {
    color: '🎨 Textures (color)',
    diffuse: '🖌 Textures (diffuse)',
    roughness: '🪶 Textures (roughness)',
    normal: '🧭 Textures (normal)',
    metalness: '🔩 Textures (metalness)',
    height: '⛰ Textures (height)',
    opacity: '🪟 Textures (opacity)',
    orm: '🧱 Textures (orm)',
    ao: '🌑 Textures (ao)',
    assets: '🧩 Assets',
  }

  for (const category of ASSET_SECTION_ORDER) {
    const entries = grouped.get(category)
    if (!entries || entries.length === 0) continue
    lines.push('')
    lines.push(sectionTitles[category])
    lines.push(...entries)
  }

  if (deletedFileNames.length > 0) {
    lines.push('')
    lines.push('🗑 Deleted')
    lines.push(...deletedFileNames.map((name) => `  ❌ ${name}`))
  }

  return lines.join('\n')
}