/**
 * Command Parser for Prix AI
 *
 * Parses and validates Prix commands from GitHub comments.
 * Supports multiple syntaxes and provides structured output.
 */

export interface ParsedCommand {
  isPrixCommand: boolean
  command: 'plan' | 'fix' | 'review' | 'help' | null
  args: string[]
  rawCommand: string
}

/**
 * Parse a comment body to detect Prix commands
 *
 * Supported syntaxes:
 * - !prix plan
 * - /prix plan
 * - prix plan
 *
 * @param commentBody The raw comment body
 * @returns Parsed command object
 */
export const parsePrixCommand = (commentBody: string): ParsedCommand => {
  const trimmed = commentBody.trim()

  // Check if this is a Prix command
  const prixCommandRegex = /^[/!]?prix\s+(\w+)(.*)$/i
  const match = trimmed.match(prixCommandRegex)

  if (!match) {
    return {
      isPrixCommand: false,
      command: null,
      args: [],
      rawCommand: ''
    }
  }

  const commandStr = match[1].toLowerCase()
  const argsStr = match[2].trim()
  const args = argsStr ? argsStr.split(/\s+/).filter(Boolean) : []

  // Map command string to command type
  const commandMap: Record<string, ParsedCommand['command']> = {
    plan: 'plan',
    fix: 'fix',
    review: 'review',
    help: 'help'
  }

  const command = commandMap[commandStr] || null

  return {
    isPrixCommand: true,
    command,
    args,
    rawCommand: match[0]
  }
}

/**
 * Check if a comment is from a bot (to prevent loops)
 *
 * @param username The GitHub username
 * @param botUsername The bot's username (default: 'prix-ai[bot]')
 * @returns True if the comment is from a bot
 */
export const isBotComment = (
  username: string | undefined,
  botUsername: string = 'prix-ai[bot]'
): boolean => {
  if (!username) return false
  const normalizedUsername = username.toLowerCase()
  const normalizedBot = botUsername.toLowerCase()
  return (
    normalizedUsername === normalizedBot || normalizedUsername.endsWith('[bot]')
  )
}