/// <reference types="node" />

import { EventEmitter } from "events";

declare class Logger extends EventEmitter {
    constructor(options: Logger.LoggerOptions);
    addStream(stream: Logger.Stream): void;
    addSerializers(serializers: Logger.Serializers): void;
    child(options: Object, simple?: boolean): Logger;
    reopenFileStreams(): void;

    level(): number;
    level(value: Logger.LogLevel): void;
    levels(): number[];
    levels(name: number | string): number;
    levels(name: number | string, value: Logger.LogLevel): void;

    fields: any;
    src: boolean;

    /**
     * Returns a boolean: is the `trace` level enabled?
     *
     * This is equivalent to `log.isTraceEnabled()` or `log.isEnabledFor(TRACE)` in log4j.
     */
    trace(): boolean;

    /**
     * Special case to log an `Error` instance to the record.
     * This adds an `err` field with exception details
     * (including the stack) and sets `msg` to the exception
     * message or you can specify the `msg`.
     */
    trace(error: Error, ...params: any[]): void;

    /**
     * The first field can optionally be a "fields" object, which
     * is merged into the log record.
     *
     * To pass in an Error *and* other fields, use the `err`
     * field name for the Error instance.
     */
    trace(obj: Object, ...params: any[]): void;

    /**
     * Uses `util.format` for msg formatting.
     */
    trace(format: any, ...params: any[]): void;

    /**
     * Returns a boolean: is the `debug` level enabled?
     *
     * This is equivalent to `log.isDebugEnabled()` or `log.isEnabledFor(DEBUG)` in log4j.
     */
    debug(): boolean;

    /**
     * Special case to log an `Error` instance to the record.
     * This adds an `err` field with exception details
     * (including the stack) and sets `msg` to the exception
     * message or you can specify the `msg`.
     */
    debug(error: Error, ...params: any[]): void;

    /**
     * The first field can optionally be a "fields" object, which
     * is merged into the log record.
     *
     * To pass in an Error *and* other fields, use the `err`
     * field name for the Error instance.
     */
    debug(obj: Object, ...params: any[]): void;

    /**
     * Uses `util.format` for msg formatting.
     */
    debug(format: any, ...params: any[]): void;

    /**
     * Returns a boolean: is the `info` level enabled?
     *
     * This is equivalent to `log.isInfoEnabled()` or `log.isEnabledFor(INFO)` in log4j.
     */
    info(): boolean;

    /**
     * Special case to log an `Error` instance to the record.
     * This adds an `err` field with exception details
     * (including the stack) and sets `msg` to the exception
     * message or you can specify the `msg`.
     */
    info(error: Error, ...params: any[]): void;

    /**
     * The first field can optionally be a "fields" object, which
     * is merged into the log record.
     *
     * To pass in an Error *and* other fields, use the `err`
     * field name for the Error instance.
     */
    info(obj: Object, ...params: any[]): void;

    /**
     * Uses `util.format` for msg formatting.
     */
    info(format: any, ...params: any[]): void;

    /**
     * Returns a boolean: is the `warn` level enabled?
     *
     * This is equivalent to `log.isWarnEnabled()` or `log.isEnabledFor(WARN)` in log4j.
     */
    warn(): boolean;

    /**
     * Special case to log an `Error` instance to the record.
     * This adds an `err` field with exception details
     * (including the stack) and sets `msg` to the exception
     * message or you can specify the `msg`.
     */
    warn(error: Error, ...params: any[]): void;

    /**
     * The first field can optionally be a "fields" object, which
     * is merged into the log record.
     *
     * To pass in an Error *and* other fields, use the `err`
     * field name for the Error instance.
     */
    warn(obj: Object, ...params: any[]): void;

    /**
     * Uses `util.format` for msg formatting.
     */
    warn(format: any, ...params: any[]): void;

    /**
     * Returns a boolean: is the `error` level enabled?
     *
     * This is equivalent to `log.isErrorEnabled()` or `log.isEnabledFor(ERROR)` in log4j.
     */
    error(): boolean;

    /**
     * Special case to log an `Error` instance to the record.
     * This adds an `err` field with exception details
     * (including the stack) and sets `msg` to the exception
     * message or you can specify the `msg`.
     */
    error(error: Error, ...params: any[]): void;

    /**
     * The first field can optionally be a "fields" object, which
     * is merged into the log record.
     *
     * To pass in an Error *and* other fields, use the `err`
     * field name for the Error instance.
     */
    error(obj: Object, ...params: any[]): void;

    /**
     * Uses `util.format` for msg formatting.
     */
    error(format: any, ...params: any[]): void;

    /**
     * Returns a boolean: is the `fatal` level enabled?
     *
     * This is equivalent to `log.isFatalEnabled()` or `log.isEnabledFor(FATAL)` in log4j.
     */
    fatal(): boolean;

    /**
     * Special case to log an `Error` instance to the record.
     * This adds an `err` field with exception details
     * (including the stack) and sets `msg` to the exception
     * message or you can specify the `msg`.
     */
    fatal(error: Error, ...params: any[]): void;

    /**
     * The first field can optionally be a "fields" object, which
     * is merged into the log record.
     *
     * To pass in an Error *and* other fields, use the `err`
     * field name for the Error instance.
     */
    fatal(obj: Object, ...params: any[]): void;

    /**
     * Uses `util.format` for msg formatting.
     */
    fatal(format: any, ...params: any[]): void;
}

declare namespace Logger {
    const TRACE: number;
    const DEBUG: number;
    const INFO: number;
    const WARN: number;
    const ERROR: number;
    const FATAL: number;

    type LogLevelString = "trace" | "debug" | "info" | "warn" | "error" | "fatal";
    type LogLevel = LogLevelString | number;

    const levelFromName: { [name in LogLevelString]: number };
    const nameFromLevel: { [level: number]: string };

    const stdSerializers: StdSerializers;

    function createLogger(options: LoggerOptions): Logger;

    function safeCycles(): (key: string, value: any) => any;

    function resolveLevel(value: LogLevel): number;

    interface WriteFn {
        write: (object: Object) => void;
    }

    interface Stream {
        type?: string | undefined;
        level?: LogLevel | undefined;
        path?: string | undefined;
        stream?: NodeJS.WritableStream | WriteFn | undefined;
        closeOnExit?: boolean | undefined;
        period?: string | undefined;
        count?: number | undefined;
        name?: string | undefined;
        reemitErrorEvents?: boolean | undefined;
    }

    interface LoggerOptions {
        name: string;
        streams?: Stream[] | undefined;
        level?: LogLevel | undefined;
        stream?: NodeJS.WritableStream | undefined;
        serializers?: Serializers | undefined;
        src?: boolean | undefined;
        [custom: string]: any;
    }

    type Serializer = (input: any) => any;

    interface Serializers {
        [key: string]: Serializer;
    }

    interface StdSerializers extends Serializers {
        err: Serializer;
        res: Serializer;
        req: Serializer;
    }

    interface RingBufferOptions {
        limit?: number | undefined;
    }

    class RingBuffer extends EventEmitter {
        constructor(options: RingBufferOptions);

        writable: boolean;
        records: any[];

        write(record: any): boolean;
        end(record?: any): void;
        destroy(): void;
        destroySoon(): void;
    }

    interface RotatingFileStreamOptions {
        path: string;
        count?: number | undefined;
        period?: string | undefined;
    }

    class RotatingFileStream extends EventEmitter {
        constructor(options: RotatingFileStreamOptions);

        writable: boolean;
        periodNum: number;
        periodScope: string;
        stream: any;
        rotQueue: any[];
        rotating: boolean;

        write(record: any): boolean;
        end(record?: any): void;
        destroy(): void;
        destroySoon(): void;
        rotate(): void;
    }
}

export = Logger;