/* eslint-disable @typescript-eslint/no-explicit-any */
import util from "util";
import chalk from "chalk";

/**
 * Log levels to indicate importance of the logged message.
 * Every level corresponds to a certain color.
 *
 * - INFO: no color
 * - WARN: yellow
 * - ERROR: red
 * - DEBUG: gray
 *
 * Messages with DEBUG level are only displayed if explicitly enabled.
 */
export const enum LogLevel {
  INFO = "info",
  WARN = "warn",
  ERROR = "error",
  DEBUG = "debug",
}

/**
 * Represents a logging device which can be used directly as a function (for INFO logging)
 * but also has dedicated logging functions for respective logging levels.
 */
export interface Logging {

  prefix: string;

  (message: string, ...parameters: any[]): void;

  info(message: string, ...parameters: any[]): void;
  warn(message: string, ...parameters: any[]): void;
  error(message: string, ...parameters: any[]): void;
  debug(message: string, ...parameters: any[]): void;
  log(level: LogLevel, message: string, ...parameters: any[]): void;

}

interface IntermediateLogging { // some auxiliary interface used to correctly type stuff happening in "withPrefix"

  prefix?: string;

  (message: string, ...parameters: any[]): void;

  info?(message: string, ...parameters: any[]): void;
  warn?(message: string, ...parameters: any[]): void;
  error?(message: string, ...parameters: any[]): void;
  debug?(message: string, ...parameters: any[]): void;
  log?(level: LogLevel, message: string, ...parameters: any[]): void;

}

/**
 * Logger class
 */
export class Logger {

  public static readonly internal = new Logger();

  private static readonly loggerCache = new Map<string, Logging>(); // global cache of logger instances by plugin name
  private static debugEnabled = false;
  private static timestampEnabled = true;

  readonly prefix?: string;

  constructor(prefix?: string) {
    this.prefix = prefix;
  }


  /**
   * Creates a new Logging device with a specified prefix.
   *
   * @param prefix {string} - the prefix of the logger
   */
  static withPrefix(prefix: string): Logging {
    const loggerStuff = Logger.loggerCache.get(prefix);

    if (loggerStuff) {
      return loggerStuff;
    } else {
      const logger = new Logger(prefix);

      const log: IntermediateLogging = logger.info.bind(logger);
      log.info = logger.info;
      log.warn = logger.warn;
      log.error = logger.error;
      log.debug = logger.debug;
      log.log = logger.log;

      log.prefix = logger.prefix;


      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
      // @ts-ignore
      const logging: Logging = log; // i aimed to not use ts-ignore in this project, but this evil "thing" above is hell
      Logger.loggerCache.set(prefix, logging);
      return logging;
    }
  }

  /**
   * Turns on debug level logging. Off by default.
   *
   * @param enabled {boolean}
   */
  public static setDebugEnabled(enabled = true): void {
    Logger.debugEnabled = enabled;
  }

  /**
   * Turns on inclusion of timestamps in log messages. On by default.
   *
   * @param enabled {boolean}
   */
  public static setTimestampEnabled(enabled = true): void {
    Logger.timestampEnabled = enabled;
  }

  /**
   * Forces color in logging output, even if it seems like color is unsupported.
   */
  public static forceColor(): void {
    chalk.level = 1; // `1` - Basic 16 colors support.
  }


  public info(message: string, ...parameters: any[]): void {
    this.log(LogLevel.INFO, message, ...parameters);
  }

  public warn(message: string, ...parameters: any[]): void {
    this.log(LogLevel.WARN, message, ...parameters);
  }

  public error(message: string, ...parameters: any[]): void {
    this.log(LogLevel.ERROR, message, ...parameters);
  }

  public debug(message: string, ...parameters: any[]): void {
    this.log(LogLevel.DEBUG, message, ...parameters);
  }

  public log(level: LogLevel, message: string, ...parameters: any[]): void {
    if (level === LogLevel.DEBUG && !Logger.debugEnabled) {
      return;
    }

    message = util.format(message, ...parameters);

    let loggingFunction = console.log;
    switch (level) {
      case LogLevel.WARN:
        message = chalk.yellow(message);
        loggingFunction = console.error;
        break;
      case LogLevel.ERROR:
        message = chalk.red(message);
        loggingFunction = console.error;
        break;
      case LogLevel.DEBUG:
        message = chalk.gray(message);
        break;
    }

    if (this.prefix) {
      message = getLogPrefix(this.prefix) + " " + message;
    }

    if (Logger.timestampEnabled) {
      const date = new Date();
      message = chalk.white(`[${date.toLocaleString()}] `) + message;
    }

    loggingFunction(message);
  }

}

/**
 * Creates a new Logging device with a specified prefix.
 *
 * @param prefix {string} - the prefix of the logger
 * @deprecated please use {@link Logger.withPrefix} directly
 */
export function withPrefix(prefix: string): Logging {
  return Logger.withPrefix(prefix);
}

/**
 * Gets the prefix
 * @param prefix 
 */
export function getLogPrefix(prefix: string): string {
  return chalk.cyan(`[${prefix}]`);
}

/**
 * Turns on debug level logging. Off by default.
 *
 * @param enabled {boolean}
 * @deprecated please use {@link Logger.setDebugEnabled} directly
 */
export function setDebugEnabled(enabled = true): void {
  Logger.setDebugEnabled(enabled);
}

/**
 * Turns on inclusion of timestamps in log messages. On by default.
 *
 * @param enabled {boolean}
 * @deprecated please use {@link Logger.setTimestampEnabled} directly
 */
export function setTimestampEnabled(enabled = true): void {
  Logger.setTimestampEnabled(enabled);
}

/**
 * Forces color in logging output, even if it seems like color is unsupported.
 *
 * @deprecated please use {@link Logger.forceColor} directly
 */
export function forceColor(): void {
  chalk.level = 1; // `1` - Basic 16 colors support.
}