"use strict";
const format = require("date-manip/dist/format");
const isWhatType = require("is-what-type");
const compilePattern = require("./compilePattern.js");
const formatMessage = require("./formatMessage.js");
const pad = require("./pad.js");
function literalConverter(text) {
  return () => text;
}
function dateConverter(dateFormat = "ISO") {
  return (event) => {
    return format(event.timestamp, dateFormat);
  };
}
function levelConverter(minWidth = 0, alignLeft = true) {
  return (event) => {
    return pad(event.levelName, minWidth, alignLeft);
  };
}
function loggerConverter(minWidth = 0, alignLeft = true) {
  return (event) => {
    const { loggerName } = event;
    return pad(loggerName, minWidth, alignLeft);
  };
}
function messageConverter(minWidth = 0, maxLength = 0, alignLeft = true) {
  return (event) => {
    return formatMessage(event.message, (msg) => {
      if (maxLength > 0 && msg.length > maxLength) {
        msg = `${msg.substring(0, maxLength)}...`;
      }
      return pad(msg, minWidth, alignLeft);
    });
  };
}
function threadConverter() {
  return () => {
    return `PID:${process.pid}`;
  };
}
function mdcConverter(key, minWidth = 0, alignLeft = true) {
  return (event) => {
    const value = event.context[key] || "";
    return pad(String(value), minWidth, alignLeft);
  };
}
class PatternLayout {
  /**
   * Constructor (构造函数)
   * @param pattern Pattern string (模版字符串)
   */
  constructor(pattern = "[%d{YYYY-MM-DD HH:mm:ss.SSSZ}] %p %c - %m", createConverter) {
    this.converters = compilePattern(
      pattern,
      (specifier, alignLeft, minWidth, maxLength, format2) => {
        if (isWhatType.isFunction(createConverter)) {
          const converter = createConverter(
            specifier,
            alignLeft,
            minWidth,
            maxLength,
            format2
          );
          if (isWhatType.isFunction(converter)) {
            return converter;
          }
        }
        switch (specifier.toLowerCase()) {
          case "%":
            return literalConverter("%");
          case "d":
            return dateConverter(format2);
          case "p":
            return levelConverter(minWidth, alignLeft);
          case "c":
            return loggerConverter(minWidth, alignLeft);
          case "m":
            return messageConverter(minWidth, maxLength, alignLeft);
          case "t":
            return threadConverter();
          case "x":
            return mdcConverter(format2 || "", minWidth, alignLeft);
          default:
            return literalConverter(`%${specifier}`);
        }
      },
      literalConverter
    );
  }
  /**
   * Add a converter (添加转换器)
   * @param fn Converter function (转换器函数)
   */
  use(fn) {
    this.converters.push(fn);
    return this;
  }
  /**
   * Format a log event (格式化日志事件)
   * @param event Log event (日志事件)
   */
  format(event) {
    return this.converters.map((converter) => converter(event)).join("");
  }
}
module.exports = PatternLayout;