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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.import { Logger } from "./logger.ts";import {  BaseHandler,  ConsoleHandler,  WriterHandler,  FileHandler} from "./handlers.ts";import { assert } from "../testing/asserts.ts";
export class LoggerConfig {  level?: string;  handlers?: string[];}
export interface LogConfig {  handlers?: {    [name: string]: BaseHandler;  };  loggers?: {    [name: string]: LoggerConfig;  };}
const DEFAULT_LEVEL = "INFO";const DEFAULT_CONFIG: LogConfig = {  handlers: {    default: new ConsoleHandler(DEFAULT_LEVEL)  },
  loggers: {    default: {      level: DEFAULT_LEVEL,      handlers: ["default"]    }  }};
const state = {  handlers: new Map<string, BaseHandler>(),  loggers: new Map<string, Logger>(),  config: DEFAULT_CONFIG};
export const handlers = {  BaseHandler,  ConsoleHandler,  WriterHandler,  FileHandler};
export function getLogger(name?: string): Logger {  if (!name) {    const d = state.loggers.get("default");    assert(      d != null,      `"default" logger must be set for getting logger without name`    );    return d;  }  const result = state.loggers.get(name);  if (!result) {    const logger = new Logger("NOTSET", []);    state.loggers.set(name, logger);    return logger;  }  return result;}
export const debug = (msg: string, ...args: unknown[]): void =>  getLogger("default").debug(msg, ...args);export const info = (msg: string, ...args: unknown[]): void =>  getLogger("default").info(msg, ...args);export const warning = (msg: string, ...args: unknown[]): void =>  getLogger("default").warning(msg, ...args);export const error = (msg: string, ...args: unknown[]): void =>  getLogger("default").error(msg, ...args);export const critical = (msg: string, ...args: unknown[]): void =>  getLogger("default").critical(msg, ...args);
export async function setup(config: LogConfig): Promise<void> {  state.config = {    handlers: { ...DEFAULT_CONFIG.handlers, ...config.handlers },    loggers: { ...DEFAULT_CONFIG.loggers, ...config.loggers }  };
  // tear down existing handlers  state.handlers.forEach((handler): void => {    handler.destroy();  });  state.handlers.clear();
  // setup handlers  const handlers = state.config.handlers || {};
  for (const handlerName in handlers) {    const handler = handlers[handlerName];    await handler.setup();    state.handlers.set(handlerName, handler);  }
  // remove existing loggers  state.loggers.clear();
  // setup loggers  const loggers = state.config.loggers || {};  for (const loggerName in loggers) {    const loggerConfig = loggers[loggerName];    const handlerNames = loggerConfig.handlers || [];    const handlers: BaseHandler[] = [];
    handlerNames.forEach((handlerName): void => {      const handler = state.handlers.get(handlerName);      if (handler) {        handlers.push(handler);      }    });
    const levelName = loggerConfig.level || DEFAULT_LEVEL;    const logger = new Logger(levelName, handlers);    state.loggers.set(loggerName, logger);  }}
setup(DEFAULT_CONFIG);