// Type definitions for log4js
// Project: https://github.com/nomiddlename/log4js-node
// Definitions by: Kentaro Okuno <http://github.com/armorik83>
// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped

/// <reference path="../express/express.d.ts" />

declare module "log4js" {
  import express = require('express');

  /**
   * Replaces the console
   * @param logger
   * @returns void
   */
  export function replaceConsole(logger?: Logger): void;

  /**
   * Restores the console
   * @returns void
   */
  export function restoreConsole(): void;

  /**
   * Get a logger instance. Instance is cached on categoryName level.
   *
   * @param   {String} [categoryName] name of category to log to.
   * @returns {Logger} instance of logger for the category
   * @static
   */
  export function getLogger(categoryName?: string): Logger;
  export function getBufferedLogger(categoryName?: string): Logger;

  /**
   * Has a logger instance cached on categoryName.
   *
   * @param   {String} [categoryName] name of category to log to.
   * @returns {boolean} contains logger for the category
   * @static
   */
  export function hasLogger(categoryName: string): boolean;

  /**
   * Get the default logger instance.
   *
   * @returns {Logger} instance of default logger
   * @static
   */
  export function getDefaultLogger(): Logger;

  /**
   * args are appender, then zero or more categories
   *
   * @param   {*[]} appenders
   * @returns {void}
   * @static
   */
  export function addAppender(...appenders: any[]): void;

  /**
   * Load appender
   *
   * @param   {string} appender type
   * @param   {AppenderModule} the appender module. by default, require('./appenders/' + appender)
   * @returns {void}
   * @static
   */
  export function loadAppender(appenderType: string, appenderModule?: AppenderModule): void;
  
  /**
   * Claer configured appenders
   *
   * @returns {void}
   * @static
   */
  export function clearAppenders(): void;

  /**
   * Shutdown all log appenders. This will first disable all writing to appenders
   * and then call the shutdown function each appender.
   *
   * @params  {Function} cb - The callback to be invoked once all appenders have
   *  shutdown. If an error occurs, the callback will be given the error object
   *  as the first argument.
   * @returns {void}
   */
  export function shutdown(cb: Function): void;

  export function configure(filename: string, options?: any): void;
  export function configure(config: IConfig, options?: any): void;

  export function setGlobalLogLevel(level: string): void;
  export function setGlobalLogLevel(level: Level): void;


  /**
   * Create logger for connect middleware.
   *
   *
   * @returns {express.Handler} Instance of middleware.
   * @static
   */
  export function connectLogger(logger: Logger, options: { format?: string; level?: string; nolog?: any; }): express.Handler;
  export function connectLogger(logger: Logger, options: { format?: string; level?: Level; nolog?: any; }): express.Handler;

  export var layouts: {
    basicLayout: Layout,
    messagePassThroughLayout: Layout,
    patternLayout: Layout,
    colouredLayout: Layout,
    coloredLayout: Layout,
    dummyLayout: Layout,

    /**
     * Register your custom layout generator
     */
    addLayout: (name: string, serializerGenerator: (config?: LayoutConfig) => Layout) => void,

    /**
     * Get layout. Available predified layout names: 
     * messagePassThrough, basic, colored, coloured, pattern, dummy
     * 
     */
    layout: (name: string, config: LayoutConfig) => Layout
  }

  export var appenders: any;
  export var levels: {
    ALL: Level;
    TRACE: Level;
    DEBUG: Level;
    INFO: Level;
    WARN: Level;
    ERROR: Level;
    FATAL: Level;
    OFF: Level;

    toLevel(level: string, defaultLevel?: Level): Level;
    toLevel(level: Level, defaultLevel?: Level): Level;
  };

  export interface Logger {
    setLevel(level: string): void;
    setLevel(level: Level): void;

    isLevelEnabled(level: Level): boolean;
    isTraceEnabled(): boolean;
    isDebugEnabled(): boolean;
    isInfoEnabled(): boolean;
    isWarnEnabled(): boolean;
    isErrorEnabled(): boolean;
    isFatalEnabled(): boolean;

    trace(message: string, ...args: any[]): void;
    debug(message: string, ...args: any[]): void;
    info(message: string, ...args: any[]): void;
    warn(message: string, ...args: any[]): void;
    error(message: string, ...args: any[]): void;
    fatal(message: string, ...args: any[]): void;
  }

  export interface Level {
    isEqualTo(other: string): boolean;
    isEqualTo(otherLevel: Level): boolean;
    isLessThanOrEqualTo(other: string): boolean;
    isLessThanOrEqualTo(otherLevel: Level): boolean;
    isGreaterThanOrEqualTo(other: string): boolean;
    isGreaterThanOrEqualTo(otherLevel: Level): boolean;
  }

  export interface IConfig {
    appenders: AppenderConfig[];
    levels?: { [category: string]: string };
    replaceConsole?: boolean;
  }

  export interface AppenderConfigBase {
    type: string;
    category?: string;
    layout?: { type: string;[key: string]: any }
  }

  export interface ConsoleAppenderConfig extends AppenderConfigBase {}

  export interface FileAppenderConfig extends AppenderConfigBase {
    filename: string;
  }
  export interface DateFileAppenderConfig extends FileAppenderConfig {
    /**
     * The following strings are recognised in the pattern:
     *  - yyyy : the full year, use yy for just the last two digits
     *  - MM   : the month
     *  - dd   : the day of the month
     *  - hh   : the hour of the day (24-hour clock)
     *  - mm   : the minute of the hour
     *  - ss   : seconds
     *  - SSS  : milliseconds (although I'm not sure you'd want to roll your logs every millisecond)
     *  - O    : timezone (capital letter o)
     */
    pattern: string;
    alwaysIncludePattern: boolean;
  }

  export interface SmtpAppenderConfig extends AppenderConfigBase {
    /** Comma separated list of email recipients */
    recipients: string;

    /** Sender of all emails (defaults to transport user) */
    sender: string;

    /** Subject of all email messages (defaults to first event's message)*/
    subject: string;

    /**
     * The time in seconds between sending attempts (defaults to 0).
     * All events are buffered and sent in one email during this time.
     * If 0 then every event sends an email
     */
    sendInterval: number;

    SMTP: {
      host: string;
      secure: boolean;
      port: number;
      auth: {
          user: string;
          pass: string;
      }
    }
  }

  export interface HookIoAppenderConfig extends FileAppenderConfig {
    maxLogSize: number;
    backup: number;
    pollInterval: number;
  }

  export interface GelfAppenderConfig extends AppenderConfigBase {
    host: string;
    hostname: string;
    port: string;
    facility: string;
  }

  export interface MultiprocessAppenderConfig extends AppenderConfigBase {
    mode: string;
    loggerPort: number;
    loggerHost: string;
    facility: string;
    appender?: AppenderConfig;
  }

  export interface LogglyAppenderConfig extends AppenderConfigBase {
    /** Loggly customer token - https://www.loggly.com/docs/api-sending-data/ */
    token: string;

    /** Loggly customer subdomain (use 'abc' for abc.loggly.com) */
    subdomain: string;

    /** an array of strings to help segment your data & narrow down search results in Loggly */
    tags: string[];

    /** Enable JSON logging by setting to 'true' */
    json: boolean;
  }

  export interface ClusteredAppenderConfig extends AppenderConfigBase {
    appenders?: AppenderConfig[];
  }

  type CoreAppenderConfig = ConsoleAppenderConfig
                          | FileAppenderConfig
                          | DateFileAppenderConfig
                          | SmtpAppenderConfig
                          | HookIoAppenderConfig
                          | GelfAppenderConfig
                          | MultiprocessAppenderConfig
                          | LogglyAppenderConfig
                          | ClusteredAppenderConfig

  interface CustomAppenderConfig extends AppenderConfigBase {
    [prop: string]: any;
  }

  type AppenderConfig = CoreAppenderConfig | CustomAppenderConfig;
  
  export interface LogEvent {
    /**
     * new Date()
     */
    startTime: number;
    categoryName: string;
    data: any[];
    level: Level;
    logger: Logger;
  }

  export interface Appender {
    (event: LogEvent): void;
  }

  export interface AppenderModule {
    appender: (...args: any[]) => Appender;
    shutdown?: (cb: (error: Error) => void) => void;
    configure: (config: CustomAppenderConfig, options?: { [key: string]: any }) => Appender;
  }

  export interface LayoutConfig {
    [key: string]: any;
  }
  export interface LayoutGenerator {
    (config?: LayoutConfig): Layout
  }

  export interface Layout {
    (event: LogEvent): string;
  }
}