import { LogLevel } from './LogLevel';

export type MessageDelegate = () => string;

export interface Logger {
  name: string;
  level: LogLevel;

  isEnabledFor(level: LogLevel | number): boolean;

  log(
    level: LogLevel | number,
    text: string | MessageDelegate,
    ...args: any[]
  ): void;
  trace(text: string | MessageDelegate, ...args: any[]): void;
  debug(text: string | MessageDelegate, ...args: any[]): void;
  info(text: string | MessageDelegate, ...args: any[]): void;
  warn(text: string | MessageDelegate, ...args: any[]): void;
  error(text: string | MessageDelegate, ...args: any[]): void;
  fatal(text: string | MessageDelegate, ...args: any[]): void;
}

export abstract class BaseLogger implements Logger {
  constructor(public readonly name: string, public level: LogLevel | number) {}

  public isEnabledFor(level: LogLevel | number) {
    return this.level <= level;
  }

  abstract log(
    level: LogLevel | number,
    text: string | MessageDelegate,
    ...args: any[]
  ): void;

  trace(textOrFn: string | MessageDelegate, ...args: any[]) {
    if (textOrFn instanceof Function) {
      this.log(LogLevel.Trace, textOrFn, ...args);
    } else {
      this.log(LogLevel.Trace, textOrFn.toString(), ...args);
    }
  }

  debug(textOrFn: string | MessageDelegate, ...args: any[]) {
    if (textOrFn instanceof Function) {
      this.log(LogLevel.Debug, textOrFn, ...args);
    } else {
      this.log(LogLevel.Debug, textOrFn.toString(), ...args);
    }
  }

  info(textOrFn: string | MessageDelegate, ...args: any[]) {
    if (textOrFn instanceof Function) {
      this.log(LogLevel.Info, textOrFn, ...args);
    } else {
      this.log(LogLevel.Info, textOrFn.toString(), ...args);
    }
  }

  warn(textOrFn: string | MessageDelegate, ...args: any[]) {
    if (textOrFn instanceof Function) {
      this.log(LogLevel.Warn, textOrFn, ...args);
    } else {
      this.log(LogLevel.Warn, textOrFn.toString(), ...args);
    }
  }

  error(textOrFn: string | MessageDelegate, ...args: any[]) {
    if (textOrFn instanceof Function) {
      this.log(LogLevel.Error, textOrFn, ...args);
    } else {
      this.log(LogLevel.Error, textOrFn.toString(), ...args);
    }
  }

  fatal(textOrFn: string | MessageDelegate, ...args: any[]) {
    if (textOrFn instanceof Function) {
      this.log(LogLevel.Fatal, textOrFn, ...args);
    } else {
      this.log(LogLevel.Fatal, textOrFn.toString(), ...args);
    }
  }
}