'use strict';

const UNKNOWN_NUMBER = -1;
const UNKNOWN_STRING = '-';

class CFLog {
  constructor(env) {
    this._env = env;
  }

  format(entryCtx) {
    const entry = createBaseEntry(entryCtx);
    const customFields = entryCtx.customFields;
    entry.msg = entryCtx.message;

    if (customFields) {
      const formattedCustomFields = {
        'string': []
      };
      let index = 0;

      for (let key in customFields) {
        formattedCustomFields.string.push({
          'k': key,
          'v': customFields[key],
          'i': index++
        });
      }

      entry['#cf'] = formattedCustomFields;
    }
    return JSON.stringify(entry);
  }

  formatNetwork(entryCtx) {
    let entry = createBaseEntry(entryCtx);

    entry['direction'] = entryCtx.reqDirection;
    entry['protocol'] = entryCtx.reqProtocol;
    entry['method'] = entryCtx.reqMethod;
    entry['request'] = entryCtx.reqPath;
    entry['request_size_b'] = entryCtx.reqSize || UNKNOWN_NUMBER;
    entry['request_received_at'] = entryCtx.reqReceivedAt;

    entry['remote_user'] = this._env.logUser ? (entryCtx.user || UNKNOWN_STRING) : 'redacted';
    entry['referer'] = this._env.logReferer ? (entryCtx.referer || UNKNOWN_STRING) : 'redacted';
    entry['remote_host'] = this._env.logConnectionData ? (entryCtx.remoteHost || UNKNOWN_STRING) : 'redacted';
    entry['remote_ip'] = this._env.logConnectionData ? (entryCtx.remoteIp || UNKNOWN_STRING) : 'redacted';
    entry['remote_port'] = this._env.logConnectionData ? (entryCtx.remotePort || UNKNOWN_STRING) : 'redacted';
    entry['x_forwarded_for'] = this._env.logConnectionData ? (entryCtx.xForwardedFor || UNKNOWN_STRING) : 'redacted';

    entry['response_sent_at'] = entryCtx.resSentAt.toDate().toJSON();
    entry['response_time_ms'] = entryCtx.resTime;
    entry['response_status'] = entryCtx.resStatus || UNKNOWN_NUMBER;
    entry['response_size_b'] = entryCtx.resSize || UNKNOWN_NUMBER;
    entry['response_content_type'] = entryCtx.resContentType || UNKNOWN_STRING;

    return JSON.stringify(entry);
  }
}

function createBaseEntry(entryCtx) {
  let entry = {
    'written_at': entryCtx.timeCreated.toDate().toJSON(),
    'written_ts': entryCtx.timeCreatedNanos,
    'csn_component': entryCtx.csnComponent || UNKNOWN_STRING,
    'correlation_id': entryCtx.correlationId || UNKNOWN_STRING,
    'type': entryCtx.type,
    'logger': entryCtx.loggingToolName,
    'layer': entryCtx.component,
    'level': entryCtx.level,

    'container_id': entryCtx.containerId || UNKNOWN_STRING,
    'component_type': entryCtx.componentType,
    'component_id': entryCtx.componentId || UNKNOWN_STRING,
    'component_name': entryCtx.componentName || UNKNOWN_STRING,
    'component_instance': entryCtx.componentInstance || UNKNOWN_NUMBER,
    'source_instance': entryCtx.sourceInstance || UNKNOWN_NUMBER,
    'organization_id': entryCtx.organizationId || UNKNOWN_STRING,
    'organization_name': entryCtx.organizationName || UNKNOWN_STRING,
    'space_id': entryCtx.spaceId || UNKNOWN_STRING,
    'space_name': entryCtx.spaceName || UNKNOWN_STRING
  };

  const contextIdProp = entryCtx.hasRequest ? 'request_id' : 'context_id';
  entry[contextIdProp] = entryCtx.id;

  return entry;
}

module.exports = CFLog;