import { statSync } from "fs";
import { Dispatch } from "./Dispatch";
import { ILogItem } from "./ILogItem";
import { LogLevel } from "./LogLevel";

export class SmartDispatch extends Dispatch {
  process(item: ILogItem) {

    let origin = item.origin;
    if (!item.origin) {
      let err = new Error();
      // we need to look through the stack and keep track of intermediate dispatches
      let stack = err.stack!.split("\n");
      let i = 0;
      while (!stack[i].includes("at SmartDispatch.process")) i++;

      let src = stack[i + 2].trim();
      let path = null;

      // now we need to format the src (at ...:..:.. or at App.<anonymous> ..., etc)
      if (src.includes("at ")) src = src.split("at ")[1];
      if (src.includes(" (")) src = src.split(" (")[1];
      if (src.includes(")")) src = src.split(")")[0];

      let file = {
        path: src.split(":")[0],
        line: src.split(":")[1],
        column: src.split(":")[2],
      };

      try {
        path = statSync(file.path).isFile() ? file.path : null;
      } catch (e) {
        path = null;
      }

      if (path) {
        // trim the path to the project root
        if (path.startsWith(process.cwd()))
          path = "." + path.slice(process.cwd().length);
        src = `${path}:${file.line}:${file.column}`;
      }
      origin = src;
    }

    if (!item.level) item.level = LogLevel.Trace;
    if (!item.timestamp) item.timestamp = new Date();

    super.process({
      ...item,
      origin
    });
  }
}