import * as pino from "pino";

// tslint:disable:no-console

type Level = "default" | "60" | "50" | "40" | "30" | "20" | "10";

const levels: { [level in Level]: string } = {
  default: "USERLVL",
  60: "FATAL",
  50: "ERROR",
  40: "WARN",
  30: "INFO",
  20: "DEBUG",
  10: "TRACE"
};

const levelColors: { [level in Level]: string } = {
  default: "text-decoration: underline; color: #000000;",
  60: "text-decoration: underline; background-color: #FF0000;",
  50: "text-decoration: underline; color: #FF0000;",
  40: "text-decoration: underline; color: #FFFF00;",
  30: "text-decoration: underline; color: #00FF00;",
  20: "text-decoration: underline; color: #0000FF;",
  10: "text-decoration: underline; color: #AAAAAA;"
};

interface ColoredString {
  str: string;
  args: any[];
}

function makeColored(str: string = ""): ColoredString {
  return { str, args: [] };
}

function concatColored(...coloredStrings: ColoredString[]): ColoredString {
  return coloredStrings.reduce(
    (prev, cur) => ({
      str: prev.str + cur.str,
      args: prev.args.concat(cur.args)
    }),
    makeColored()
  );
}

const standardKeys = [
  "pid",
  "hostname",
  "name",
  "level",
  "time",
  "v",
  "source",
  "msg"
];

export function write(value: any) {
  let line = concatColored(
    // makeColored(formatTime(value, " ")),
    formatSource(value),
    formatLevel(value),
    makeColored(": ")
  );

  if (value.msg) {
    line = concatColored(line, {
      str: "%c" + value.msg,
      args: ["color: #00FFFF"]
    });
  }
  const args = [line.str]
    .concat(line.args)
    .concat([value.type === "Error" ? value.stack : filter(value)]);
  let fn;
  if (value.level >= 50) {
    fn = console.error;
  } else if (value.level >= 40) {
    fn = console.warn;
  } else {
    fn = console.log;
  }
  fn.apply(null, args as any);
}

function filter(value: any) {
  const keys = Object.keys(value);
  const result: any = {};

  for (const key of keys) {
    if (standardKeys.indexOf(key) < 0) {
      result[key] = value[key];
    }
  }

  return result;
}

function formatSource(value: any): { str: string; args: any[] } {
  if (value.source) {
    return { str: "%c(" + value.source + ") ", args: ["color: #FF00FF"] };
  } else {
    return { str: "", args: [] };
  }
}

function formatLevel(value: any): ColoredString {
  const level = value.level as Level;
  if (levelColors.hasOwnProperty(level)) {
    return {
      str: "%c" + levels[level] + "%c",
      args: [levelColors[level], ""]
    };
  } else {
    return {
      str: levels.default,
      args: [levelColors.default]
    };
  }
}

const browserLogger = {
  serialize: true,
  write
};

export default browserLogger;