import type { AgentEvent } from './api'

/** 合并重连批次并按事件主键去重。 */
export function appendUniqueEvents(current: AgentEvent[], incoming: AgentEvent[]) {
  if (!incoming.length) return current
  const lastId = current.at(-1)?.id
  if (lastId == null || incoming[0].id > lastId) return current.concat(incoming)
  const ids = new Set(current.map(event => event.id))
  return current.concat(incoming.filter(event => !ids.has(event.id)))
}

/** 新工具使用结构化状态；解码 SDK 包装后兼容已保存的旧事件。 */
export function parseToolResult(content: unknown, toolName: string) {
  let value = content
  for (let i = 0; i < 2 && typeof value === 'string'; i++) {
    try { value = JSON.parse(value) } catch { break }
  }
  const text = typeof value === 'string' ? value : JSON.stringify(value) ?? ''
  if ((toolName === 'execute' || toolName === 'edit_file') && value && typeof value === 'object') {
    const result = value as Record<string, unknown>
    if (typeof result.success === 'boolean') return { text, failed: !result.success }
    if (typeof result.exitCode === 'number') return { text, failed: result.exitCode !== 0 }
    if (result.isError === true || result.error) return { text, failed: true }
  }
  if (toolName === 'document_view' && text.includes('document_view_result=')) {
    try {
      const metadata = JSON.parse(text.split('document_view_result=')[1]!.split('\n')[0]!)
      if (Array.isArray(metadata.errors) && metadata.errors.length) return { text, failed: true }
    } catch { return { text, failed: true } }
  }
  const error = /(?:执行失败|(?:^|\n)\s*(?:error:|failed\b|exit code:\s*-?[1-9]))/i.test(text.trim())
  const legacyShellError = toolName === 'execute'
    && /(?:^|\n)(?:\w*Error:|Traceback \(most recent call last\):)/.test(text)
  return { text, failed: error || legacyShellError }
}