package io

import (
	"encoding/json"
	"fmt"
	"os"
)

func ReadRequiredFile(path string, label string) ([]byte, error) {
	contents, err := os.ReadFile(path)
	if err != nil {
		return nil, fmt.Errorf("failed to read %s file %q: %w", label, path, err)
	}
	return contents, nil
}

func ValidateWellFormedJSON(path string, raw []byte) error {
	if !json.Valid(raw) {
		return fmt.Errorf("transcript file %q is not valid JSON", path)
	}
	return nil
}

func WriteFile(path string, contents []byte) error {
	if err := os.WriteFile(path, contents, 0o644); err != nil {
		return fmt.Errorf("failed to write output file %q: %w", path, err)
	}
	return nil
}