export interface LogEntry {
  id: string;
  timestamp: Date;
  level: "debug" | "info" | "warn" | "error";
  message: string;
  details?: string;
}

let nextId = 1;

export function useLoggerState() {
  return useState<LogEntry[]>("dev-logs", () => []);
}

export function useLogger() {
  const logs = useLoggerState();

  function log(level: LogEntry["level"], message: string, details?: string) {
    const entry: LogEntry = {
      id: String(nextId++),
      timestamp: new Date(),
      level,
      message,
      details,
    };
    logs.value.unshift(entry);

    // Keep max 200 entries
    if (logs.value.length > 200) {
      logs.value = logs.value.slice(0, 200);
    }

    // Also mirror to console
    const consoleMsg = details ? `${message} | ${details}` : message;
    if (level === "error") console.error(consoleMsg);
    else if (level === "warn") console.warn(consoleMsg);
    else if (level === "debug") console.debug(consoleMsg);
    else console.log(consoleMsg);
  }

  function debug(message: string, details?: string) {
    log("debug", message, details);
  }

  function info(message: string, details?: string) {
    log("info", message, details);
  }

  function warn(message: string, details?: string) {
    log("warn", message, details);
  }

  function error(message: string, details?: string) {
    log("error", message, details);
  }

  function clear() {
    logs.value = [];
  }

  function exportLogs(): string {
    return logs.value
      .slice()
      .reverse()
      .map(
        (entry) =>
          `[${entry.timestamp.toISOString()}] [${entry.level.toUpperCase()}] ${entry.message}${
            entry.details ? `\n  Details: ${entry.details}` : ""
          }`,
      )
      .join("\n---\n");
  }

  return {
    logs,
    debug,
    info,
    warn,
    error,
    clear,
    exportLogs,
  };
}

export function formatError(err: unknown): { message: string; details?: string } {
  if (err instanceof Error) {
    return { message: err.message, details: err.stack };
  }
  if (typeof err === "string") {
    return { message: err };
  }
  try {
    return { message: JSON.stringify(err) };
  } catch {
    return { message: "Unknown error" };
  }
}