class Multiwoven::Integrations::Source::Anthropic::Client

def build_headers(connection_config, streaming: false)
  {
    "x-api-key" => connection_config[:api_key],
    "anthropic-version" => API_VERSION,
    "content-type" => "application/json"
  }.tap do |headers|
    headers["transfer-encoding"] = "chunked" if streaming
  end
end

def check_chunk_error(chunk)
  return unless chunk.include?("{\"type\":\"error\"")
  data = JSON.parse(chunk)
  raise StandardError, "Error: #{data["error"]}" if data["error"] && data["error"]["message"]
end

def check_connection(connection_config)
  connection_config = prepare_config(connection_config)
  response = make_request(ANTHROPIC_URL, HTTP_POST, connection_config[:request_format], connection_config)
  success?(response) ? success_status : failure_status(nil)
rescue StandardError => e
  handle_exception(e, { context: "ANTHROPIC:CHECK_CONNECTION:EXCEPTION", type: "error" })
  failure_status(e)
end

def discover(_connection_config = nil)
  catalog_json = read_json(CATALOG_SPEC_PATH)
  catalog = build_catalog(catalog_json)
  catalog.to_multiwoven_message
rescue StandardError => e
  handle_exception(e, { context: "ANTHROPIC:DISCOVER:EXCEPTION", type: "error" })
end

def extract_content_event(chunk)
  events = chunk.split("\n\n")
  events.find { |e| e.include?("event: content_block_delta") }
end

def make_request(url, http_method, payload, connection_config)
  send_request(
    url: url,
    http_method: http_method,
    payload: JSON.parse(payload),
    headers: build_headers(connection_config, streaming: false),
    config: connection_config[:config]
  )
end

def parse_json(json_string)
  JSON.parse(json_string)
rescue JSON::ParserError => e
  handle_exception(e, { context: "ANTHROPIC:PARSE_JSON:EXCEPTION", type: "error" })
  {}
end

def prepare_config(config)
  config.with_indifferent_access.tap do |conf|
    conf[:config][:timeout] ||= 30
  end
end

def process_response(response)
  if success?(response)
    data = JSON.parse(response.body)
    [RecordMessage.new(data: data, emitted_at: Time.now.to_i).to_multiwoven_message]
  else
    create_log_message("ANTHROPIC:RUN_MODEL", "error", "request failed: #{response.body}")
  end
rescue StandardError => e
  handle_exception(e, { context: "ANTHROPIC:PROCESS_RESPONSE:EXCEPTION", type: "error" })
end

def process_streaming_response(chunk)
  check_chunk_error(chunk)
  chunk.each_line do |event|
    next unless event.include?("\"type\":\"content_block_delta\"")
    json_string = event.split("\n").find { |line| line.start_with?("data: ") }&.sub(/^data: /, "")
    next unless json_string
    parsed_data = JSON.parse(json_string)
    yield [RecordMessage.new(data: parsed_data, emitted_at: Time.now.to_i).to_multiwoven_message] if block_given?
  end
end

def read(sync_config)
  # The server checks the ConnectorQueryType.
  # If it's "ai_ml," the server calculates the payload and passes it as a query in the sync config model protocol.
  # This query is then sent to the AI/ML model.
  connection_config = prepare_config(sync_config.source.connection_specification)
  stream = connection_config[:is_stream] ||= false
  payload = sync_config.model.query
  if stream
    run_model_stream(connection_config, payload) { |message| yield message if block_given? }
  else
    run_model(connection_config, payload)
  end
rescue StandardError => e
  handle_exception(e, { context: "ANTHROPIC:READ:EXCEPTION", type: "error" })
end

def run_model(connection_config, payload)
  response = make_request(ANTHROPIC_URL, HTTP_POST, payload, connection_config)
  process_response(response)
rescue StandardError => e
  handle_exception(e, { context: "ANTHROPIC:RUN_MODEL:EXCEPTION", type: "error" })
end

def run_model_stream(connection_config, payload)
  send_streaming_request(
    url: ANTHROPIC_URL,
    http_method: HTTP_POST,
    payload: JSON.parse(payload),
    headers: build_headers(connection_config, streaming: true),
    config: connection_config[:config]
  ) do |chunk|
    process_streaming_response(chunk) { |message| yield message if block_given? }
  end
rescue StandardError => e
  handle_exception(e, { context: "ANTHROPIC:RUN_STREAM_MODEL:EXCEPTION", type: "error" })
end