import path from 'node:path'
import fs from 'node:fs'
import process from 'node:process'

function hasComponentProjectSourceDir(directory: string): boolean {
  return (
    fs.existsSync(path.join(directory, 'src', 'components')) ||
    fs.existsSync(path.join(directory, 'src', 'video', 'chapters'))
  )
}

function findComponentProjectInstallRoot(startDirectory: string): string | undefined {
  let currentDirectory = path.resolve(startDirectory)

  for (;;) {
    if (hasComponentProjectSourceDir(currentDirectory)) {
      return currentDirectory
    }

    const parentDirectory = path.dirname(currentDirectory)
    if (parentDirectory === currentDirectory) {
      return undefined
    }

    currentDirectory = parentDirectory
  }
}

export function resolveComponentProjectInstallRoot(): string {
  const candidates = [
    process.cwd(),
    process.env.INIT_CWD,
    process.env.npm_config_local_prefix,
  ].filter((value): value is string => Boolean(value && value.trim()))

  for (const candidate of candidates) {
    const resolved = findComponentProjectInstallRoot(candidate)
    if (resolved) {
      return resolved
    }
  }

  return path.resolve(process.cwd())
}

export function resolveComponentProjectGeneratedDocsDir(
  projectRoot = resolveComponentProjectInstallRoot(),
): string {
  return path.join(
    projectRoot,
    '.agents',
    './skills/metadata/metadata',
    'project-allow-component',
    'components',
  )
}

export function resolveComponentProjectGeneratedManifestPath(
  projectRoot = resolveComponentProjectInstallRoot(),
): string {
  return path.join(
    projectRoot,
    '.agents',
    './skills/metadata/metadata',
    'project-allow-component',
    'component-project-helper.manifest.json',
  )
}