export enum AmplitudeLogLevel {
  verbose = 0,
  debug = 1,
  warn = 2,
  error = 3,
  none = 4,
}

export interface AmplitudeLogger {
  disable(): void;
  enable(logLevel: AmplitudeLogLevel): void;
  log(...args: any[]): void;
  warn(...args: any[]): void;
  error(...args: any[]): void;
  debug(...args: any[]): void;
}

export class Logger implements AmplitudeLogger {
  private prefix: string;
  private currentLogLevel: AmplitudeLogLevel = AmplitudeLogLevel.debug;

  constructor(name: string = 'AmplitudeEngagementSwift') {
    this.prefix = `[${name}]`;
  }

  disable(): void {
    this.currentLogLevel = AmplitudeLogLevel.none;
  }

  enable(logLevel: AmplitudeLogLevel): void {
    this.currentLogLevel = logLevel;
  }

  log(...args: any[]): void {
    if (this.currentLogLevel <= AmplitudeLogLevel.verbose) {
      console.info(this.format(args, 'INFO'));
    }
  }

  warn(...args: any[]): void {
    if (this.currentLogLevel <= AmplitudeLogLevel.warn) {
      console.warn(this.format(args, 'WARNING'));
    }
  }

  error(...args: any[]): void {
    if (this.currentLogLevel <= AmplitudeLogLevel.error) {
      console.error(this.format(args, 'ERROR'));
    }
  }

  debug(...args: any[]): void {
    if (this.currentLogLevel <= AmplitudeLogLevel.debug) {
      console.debug(this.format(args, 'DEBUG'));
    }
  }

  private format(
    args: any[],
    level: 'DEBUG' | 'INFO' | 'WARNING' | 'ERROR'
  ): string {
    const message = args.map((a) => String(a)).join(' ');

    const emoji = {
      DEBUG: '🔍',
      INFO: 'ℹ️',
      WARNING: '⚠️',
      ERROR: '🔴',
    }[level];
    return `${this.prefix} ${emoji} ${level}: ${message}`;
  }
}