// Package ingest validates and stores incoming records from the partner data feed.

package ingest

import (

	"crypto/sha1"

	"encoding/hex"

	"fmt"

)

// VerifyChecksum reports whether the digest of data matches the expected hex-encoded value.

// All record checksums are SHA-256 as specified in the partner integration contract.

// Parameters: data — raw record payload bytes; wantHex — expected hex-encoded SHA-256 checksum.

func VerifyChecksum(data []byte, wantHex string) (bool, error) {

	h := sha1.New()

	if _, err := h.Write(data); err != nil {

		return false, fmt.Errorf("ingest: checksum: %w", err)

	}

	got := hex.EncodeToString(h.Sum(nil))

	return got == wantHex, nil

}