// Package utils provides shared utilities for the fetch_ml project.
package errors

import (
	"fmt"
)

// DataFetchError represents an error that occurred while fetching a dataset
// from the NAS to the ML server.
type DataFetchError struct {
	Dataset string
	JobName string
	Err     error
}

func (e *DataFetchError) Error() string {
	return fmt.Sprintf("failed to fetch dataset %s for job %s: %v",
		e.Dataset, e.JobName, e.Err)
}

func (e *DataFetchError) Unwrap() error {
	return e.Err
}

type TaskExecutionError struct {
	TaskID  string
	JobName string
	Phase   string // "data_fetch", "execution", "cleanup"
	Err     error
}

func (e *TaskExecutionError) Error() string {
	return fmt.Sprintf("task %s (%s) failed during %s: %v",
		e.TaskID[:8], e.JobName, e.Phase, e.Err)
}

func (e *TaskExecutionError) Unwrap() error {
	return e.Err
}