import MarkdownIt from 'markdown-it'

export function formatSize(n: number) {
  if (n < 1024) return `${n} B`
  if (n < 1048576) return `${(n / 1024).toFixed(1)} KB`
  return `${(n / 1048576).toFixed(1)} MB`
}

export function basename(p: string) {
  return p.split('/').pop() ?? p
}

const TOOL_LABELS: Record<string, string> = {
  'mcp__gateway__convert_document': 'Convert',
  'mcp__gateway__recalc_workbook': 'Recalc',
  'mcp__gateway__web_fetch': 'Fetch',
  'mcp__gateway__kb_list_roots': 'Knowledge',
  'AskUserQuestion': 'Question',
  'WebFetch': 'Fetch',
  'WebSearch': 'Search',
  'TodoWrite': 'Todo',
}

export function toolLabel(name: string) {
  if (TOOL_LABELS[name]) return TOOL_LABELS[name]
  if (name.startsWith('mcp__')) return name.split('__').slice(2).join('.')
  return name
}

export function fileIcon(mime: string, path: string) {
  const ext = path.split('.').pop()?.toLowerCase() ?? ''
  if (mime.startsWith('image/')) return 'codicon-file-media'
  if (['xlsx', 'xls', 'csv', 'ods'].includes(ext)) return 'codicon-table'
  if (ext === 'pdf') return 'codicon-file-pdf'
  if (['docx', 'doc', 'md', 'txt', 'odt'].includes(ext)) return 'codicon-file-text'
  if (['zip', 'tar', 'gz'].includes(ext)) return 'codicon-file-zip'
  if (['py', 'js', 'ts', 'json', 'html', 'sql', 'sh'].includes(ext)) return 'codicon-file-code'
  return 'codicon-file'
}

const md = new MarkdownIt({ html: false, linkify: true, breaks: false, typographer: false })
const defaultLink = md.renderer.rules.link_open ?? ((tokens, idx, options, _env, self) => self.renderToken(tokens, idx, options))
md.renderer.rules.link_open = (tokens, idx, options, env, self) => {
  tokens[idx]!.attrSet('target', '_blank')
  tokens[idx]!.attrSet('rel', 'noopener noreferrer')
  return defaultLink(tokens, idx, options, env, self)
}

export function renderMarkdown(src: string) {
  return md.render(src)
}

export function stringifyInput(input: unknown) {
  if (input === null || input === undefined) return ''
  if (typeof input === 'string') return input
  try {
    return JSON.stringify(input, null, 2)
  } catch {
    return String(input)
  }
}