import { LogLevelFn, mkLevel, stringifyPairs, timeFns } from "json-log";

export interface KrlLogger {
  readonly error: LogLevelFn;
  readonly warn: LogLevelFn;
  readonly info: LogLevelFn;
  readonly klog: LogLevelFn;
  readonly debug: LogLevelFn;

  child(moreCtx: any): KrlLogger;
}

export function makeKrlLogger(
  write: (line: string) => void,
  baseCtx: any = {}
): KrlLogger {
  function mk(ctx: string): KrlLogger {
    return {
      error: mkLevel(10, timeFns.iso, ctx, write),
      warn: mkLevel(20, timeFns.iso, ctx, write),
      info: mkLevel(30, timeFns.iso, ctx, write),
      klog: mkLevel(40, timeFns.iso, ctx, write),
      debug: mkLevel(50, timeFns.iso, ctx, write),

      child(moreCtx: any) {
        return mk(ctx + stringifyPairs(moreCtx));
      },
    };
  }
  return mk(stringifyPairs(baseCtx));
}

export const krlLogLevelCodeToHuman: { [level: string]: string } = {
  "10": "error",
  "20": "warn",
  "30": "info",
  "40": "klog",
  "50": "debug",
};