import { relative, sep } from 'node:path'

function relativeWorkspacePath(workspaceRoot, targetPath) {
  const path = relative(workspaceRoot, targetPath)
  if (!path || path === '..' || path.startsWith(`..${sep}`)) {
    throw new Error('Spine 3.8 工程文件必须位于连接器工作目录内')
  }
  return path
}

export function normalizeSpine38ImagesPath(imagesDirectory) {
  const path = String(imagesDirectory || 'images')
    .replace(/\\/g, '/')
    .replace(/^\.\/+/, '')
    .replace(/\/+$/, '')
  return path || 'images'
}

export function prepareSpine38SkeletonJson(skeleton, imagesDirectory) {
  const prepared = JSON.parse(JSON.stringify(skeleton))
  prepared.skeleton ||= {}
  // Spine 3.8 的命令行导入器对 "./images/" 的处理并不稳定，某些工程会
  // 将其固化为导入时的临时绝对路径。使用无前缀、无尾斜杠的工程内路径。
  prepared.skeleton.images = normalizeSpine38ImagesPath(imagesDirectory)
  return `${JSON.stringify(prepared, null, 2)}\n`
}

export function createSpine38ImportOptions({ workspaceRoot, inputPath, outputPath }) {
  return {
    cwd: workspaceRoot,
    inputPath: relativeWorkspacePath(workspaceRoot, inputPath),
    outputPath: relativeWorkspacePath(workspaceRoot, outputPath),
  }
}