package store

import (
	"context"
	"fmt"
	"time"
)

// EvidencePackage ist das Ergebnis der Archivierung eines Beitrags:
// Dossier-Pfad, Hash der kanonisierten Metadaten und RFC-3161-Token.
// Append-only: siehe Migration.
type EvidencePackage struct {
	ID             string
	SubmissionID   string
	DossierPath    string
	SHA256         string
	TimestampToken []byte
	CreatedAt      time.Time
}

// CreateEvidencePackage speichert ein EvidencePackage.
func (s *Store) CreateEvidencePackage(ctx context.Context, submissionID, dossierPath, sha256Hex string, timestampToken []byte) (EvidencePackage, error) {
	var e EvidencePackage
	err := s.Pool.QueryRow(ctx, `
		INSERT INTO evidence_package (submission_id, dossier_path, sha256, timestamp_token)
		VALUES ($1, $2, $3, $4)
		RETURNING id, submission_id, dossier_path, sha256, timestamp_token, created_at
	`, submissionID, dossierPath, sha256Hex, timestampToken).Scan(
		&e.ID, &e.SubmissionID, &e.DossierPath, &e.SHA256, &e.TimestampToken, &e.CreatedAt,
	)
	if err != nil {
		return EvidencePackage{}, fmt.Errorf("store: create evidence package: %w", err)
	}
	return e, nil
}

// GetLatestEvidencePackage liefert das zuletzt erzeugte EvidencePackage
// für einen Beitrag.
func (s *Store) GetLatestEvidencePackage(ctx context.Context, submissionID string) (EvidencePackage, error) {
	var e EvidencePackage
	err := s.Pool.QueryRow(ctx, `
		SELECT id, submission_id, dossier_path, sha256, timestamp_token, created_at
		FROM evidence_package
		WHERE submission_id = $1
		ORDER BY created_at DESC
		LIMIT 1
	`, submissionID).Scan(
		&e.ID, &e.SubmissionID, &e.DossierPath, &e.SHA256, &e.TimestampToken, &e.CreatedAt,
	)
	if err != nil {
		return EvidencePackage{}, fmt.Errorf("store: get latest evidence package: %w", err)
	}
	return e, nil
}