module AutovoiceSelect

# File lib/autovoice/select.rb, line 68
def ai_pick(prompt, runner:, allowed_nicks:)
  result = runner.call(prompt)
  return nil unless result.respond_to?(:success?) && result.success?

  parse_pick(result.text, allowed_nicks: allowed_nicks)
rescue StandardError
  nil
end

# File lib/autovoice/select.rb, line 35
def build_prompt(channel:, network:, candidates:)
  lines = candidates.map do |entry|
    snippet = entry[:snippet].to_s.strip
    suffix = snippet.empty? ? "" : " — #{snippet}"
    "- #{entry[:nick]}#{suffix}"
  end
  parts = [
    INSTRUCTION,
    "Channel: #{channel} on #{network}",
    "Candidates:",
    *lines
  ]
  AiGuard.guard_prompt(parts.join("\n"))
end

# File lib/autovoice/select.rb, line 78
def fallback_pick(candidates)
  entry = candidates.first
  { nick: entry[:nick], flair: nil }
end

# File lib/autovoice/select.rb, line 50
def parse_pick(text, allowed_nicks:)
  cleaned = text.to_s.strip
  return nil if cleaned.empty?
  return nil if AiGuard.system_request?(cleaned)

  match = cleaned.match(PICK_PATTERN)
  return nil unless match

  nick = Normalize.nick(match[1])
  return nil unless allowed_nicks.any? { |candidate| candidate.casecmp?(nick) }

  flair = match[2].to_s.strip
  flair = nil if flair.empty?
  flair = flair[0, MAX_FLAIR_CHARS] if flair

  { nick: nick, flair: flair }
end

# File lib/autovoice/select.rb, line 22
def pick(candidates:, channel:, network:, runner: nil)
  list = Array(candidates)
  return nil if list.empty?

  if runner
    prompt = build_prompt(channel: channel, network: network, candidates: list)
    parsed = ai_pick(prompt, runner: runner, allowed_nicks: list.map { |entry| entry[:nick] })
    return parsed if parsed
  end

  fallback_pick(list)
end