import fs from "node:fs";
import type { Page } from "playwright";

export type ConsoleEvent = {
  ts: number;
  iso: string;
  phase: string;
  type: string;
  text: string;
  location?: string;
};

export class ConsoleLogger {
  private phase = "recording_start";

  constructor(private readonly outPath: string) {
    fs.mkdirSync(dirname(outPath), { recursive: true });
  }

  setPhase(phase: string): void {
    this.phase = phase;
  }

  attach(page: Page): void {
    page.on("console", (msg) => {
      const entry: ConsoleEvent = {
        ts: Date.now(),
        iso: new Date().toISOString(),
        phase: this.phase,
        type: msg.type(),
        text: msg.text().slice(0, 2000),
        location: msg.location()?.url,
      };
      fs.appendFileSync(this.outPath, `${JSON.stringify(entry)}\n`, "utf8");
    });

    page.on("pageerror", (error) => {
      const entry: ConsoleEvent = {
        ts: Date.now(),
        iso: new Date().toISOString(),
        phase: this.phase,
        type: "pageerror",
        text: error.message.slice(0, 2000),
      };
      fs.appendFileSync(this.outPath, `${JSON.stringify(entry)}\n`, "utf8");
    });
  }
}

function dirname(filePath: string): string {
  const idx = Math.max(filePath.lastIndexOf("/"), filePath.lastIndexOf("\\"));
  return idx >= 0 ? filePath.slice(0, idx) : filePath;
}