package userstore

import (
	"context"
	"database/sql"
	"errors"
	"fmt"
	"time"

	pgtable "galaxy/user/internal/adapters/postgres/jet/user/table"
	"galaxy/user/internal/domain/common"
	"galaxy/user/internal/domain/entitlement"
	"galaxy/user/internal/ports"

	pg "github.com/go-jet/jet/v2/postgres"
)

// entitlementPeriodSelectColumns is the canonical SELECT list for
// entitlement_records, matching scanEntitlementPeriod's column order.
var entitlementPeriodSelectColumns = pg.ColumnList{
	pgtable.EntitlementRecords.RecordID,
	pgtable.EntitlementRecords.UserID,
	pgtable.EntitlementRecords.PlanCode,
	pgtable.EntitlementRecords.Source,
	pgtable.EntitlementRecords.ActorType,
	pgtable.EntitlementRecords.ActorID,
	pgtable.EntitlementRecords.ReasonCode,
	pgtable.EntitlementRecords.StartsAt,
	pgtable.EntitlementRecords.EndsAt,
	pgtable.EntitlementRecords.CreatedAt,
	pgtable.EntitlementRecords.ClosedAt,
	pgtable.EntitlementRecords.ClosedByType,
	pgtable.EntitlementRecords.ClosedByID,
	pgtable.EntitlementRecords.ClosedReasonCode,
}

// entitlementSnapshotSelectColumns is the canonical SELECT list for
// entitlement_snapshots, matching scanEntitlementSnapshotRow's column order.
var entitlementSnapshotSelectColumns = pg.ColumnList{
	pgtable.EntitlementSnapshots.UserID,
	pgtable.EntitlementSnapshots.PlanCode,
	pgtable.EntitlementSnapshots.IsPaid,
	pgtable.EntitlementSnapshots.StartsAt,
	pgtable.EntitlementSnapshots.EndsAt,
	pgtable.EntitlementSnapshots.Source,
	pgtable.EntitlementSnapshots.ActorType,
	pgtable.EntitlementSnapshots.ActorID,
	pgtable.EntitlementSnapshots.ReasonCode,
	pgtable.EntitlementSnapshots.UpdatedAt,
}

// CreateEntitlementRecord stores one new entitlement period history record.
// The unique key is record_id; a duplicate record_id returns
// ports.ErrConflict.
func (store *Store) CreateEntitlementRecord(ctx context.Context, record entitlement.PeriodRecord) error {
	if err := record.Validate(); err != nil {
		return fmt.Errorf("create entitlement record in postgres: %w", err)
	}
	operationCtx, cancel, err := store.operationContext(ctx, "create entitlement record in postgres")
	if err != nil {
		return err
	}
	defer cancel()
	return insertEntitlementPeriod(operationCtx, store.db, record)
}

// GetEntitlementRecordByID returns the entitlement period record identified
// by recordID.
func (store *Store) GetEntitlementRecordByID(ctx context.Context, recordID entitlement.EntitlementRecordID) (entitlement.PeriodRecord, error) {
	if err := recordID.Validate(); err != nil {
		return entitlement.PeriodRecord{}, fmt.Errorf("get entitlement record from postgres: %w", err)
	}
	operationCtx, cancel, err := store.operationContext(ctx, "get entitlement record from postgres")
	if err != nil {
		return entitlement.PeriodRecord{}, err
	}
	defer cancel()

	stmt := pg.SELECT(entitlementPeriodSelectColumns).
		FROM(pgtable.EntitlementRecords).
		WHERE(pgtable.EntitlementRecords.RecordID.EQ(pg.String(recordID.String())))

	query, args := stmt.Sql()
	row := store.db.QueryRowContext(operationCtx, query, args...)
	record, err := scanEntitlementPeriodRow(row)
	switch {
	case errors.Is(err, ports.ErrNotFound):
		return entitlement.PeriodRecord{}, fmt.Errorf("get entitlement record %q from postgres: %w", recordID, ports.ErrNotFound)
	case err != nil:
		return entitlement.PeriodRecord{}, fmt.Errorf("get entitlement record %q from postgres: %w", recordID, err)
	}
	return record, nil
}

// ListEntitlementRecordsByUserID returns every entitlement period record
// owned by userID, ordered by created_at ascending so historical replay is
// deterministic.
func (store *Store) ListEntitlementRecordsByUserID(ctx context.Context, userID common.UserID) ([]entitlement.PeriodRecord, error) {
	if err := userID.Validate(); err != nil {
		return nil, fmt.Errorf("list entitlement records from postgres: %w", err)
	}
	operationCtx, cancel, err := store.operationContext(ctx, "list entitlement records from postgres")
	if err != nil {
		return nil, err
	}
	defer cancel()

	stmt := pg.SELECT(entitlementPeriodSelectColumns).
		FROM(pgtable.EntitlementRecords).
		WHERE(pgtable.EntitlementRecords.UserID.EQ(pg.String(userID.String()))).
		ORDER_BY(pgtable.EntitlementRecords.CreatedAt.ASC(), pgtable.EntitlementRecords.RecordID.ASC())

	query, args := stmt.Sql()
	rows, err := store.db.QueryContext(operationCtx, query, args...)
	if err != nil {
		return nil, fmt.Errorf("list entitlement records for %q from postgres: %w", userID, err)
	}
	defer func() { _ = rows.Close() }()

	out := make([]entitlement.PeriodRecord, 0)
	for rows.Next() {
		record, err := scanEntitlementPeriodRows(rows)
		if err != nil {
			return nil, fmt.Errorf("list entitlement records for %q from postgres: %w", userID, err)
		}
		out = append(out, record)
	}
	if err := rows.Err(); err != nil {
		return nil, fmt.Errorf("list entitlement records for %q from postgres: %w", userID, err)
	}
	return out, nil
}

// UpdateEntitlementRecord replaces one stored entitlement period record. The
// statement matches by record_id; ports.ErrNotFound is returned when the
// record does not exist.
func (store *Store) UpdateEntitlementRecord(ctx context.Context, record entitlement.PeriodRecord) error {
	if err := record.Validate(); err != nil {
		return fmt.Errorf("update entitlement record in postgres: %w", err)
	}
	operationCtx, cancel, err := store.operationContext(ctx, "update entitlement record in postgres")
	if err != nil {
		return err
	}
	defer cancel()

	rows, err := updateEntitlementPeriod(operationCtx, store.db, record)
	if err != nil {
		return fmt.Errorf("update entitlement record %q in postgres: %w", record.RecordID, err)
	}
	if rows == 0 {
		return fmt.Errorf("update entitlement record %q in postgres: %w", record.RecordID, ports.ErrNotFound)
	}
	return nil
}

func updateEntitlementPeriod(ctx context.Context, q queryer, record entitlement.PeriodRecord) (int64, error) {
	stmt := pgtable.EntitlementRecords.UPDATE(
		pgtable.EntitlementRecords.PlanCode,
		pgtable.EntitlementRecords.Source,
		pgtable.EntitlementRecords.ActorType,
		pgtable.EntitlementRecords.ActorID,
		pgtable.EntitlementRecords.ReasonCode,
		pgtable.EntitlementRecords.StartsAt,
		pgtable.EntitlementRecords.EndsAt,
		pgtable.EntitlementRecords.CreatedAt,
		pgtable.EntitlementRecords.ClosedAt,
		pgtable.EntitlementRecords.ClosedByType,
		pgtable.EntitlementRecords.ClosedByID,
		pgtable.EntitlementRecords.ClosedReasonCode,
	).SET(
		string(record.PlanCode),
		record.Source.String(),
		record.Actor.Type.String(),
		nullableActorID(record.Actor.ID),
		record.ReasonCode.String(),
		record.StartsAt.UTC(),
		nullableTime(record.EndsAt),
		record.CreatedAt.UTC(),
		nullableTime(record.ClosedAt),
		nullableActorType(record.ClosedBy.Type),
		nullableActorID(record.ClosedBy.ID),
		nullableReasonCode(record.ClosedReasonCode),
	).WHERE(pgtable.EntitlementRecords.RecordID.EQ(pg.String(record.RecordID.String())))

	query, args := stmt.Sql()
	res, err := q.ExecContext(ctx, query, args...)
	if err != nil {
		return 0, err
	}
	return res.RowsAffected()
}

func insertEntitlementPeriod(ctx context.Context, q queryer, record entitlement.PeriodRecord) error {
	stmt := pgtable.EntitlementRecords.INSERT(
		pgtable.EntitlementRecords.RecordID,
		pgtable.EntitlementRecords.UserID,
		pgtable.EntitlementRecords.PlanCode,
		pgtable.EntitlementRecords.Source,
		pgtable.EntitlementRecords.ActorType,
		pgtable.EntitlementRecords.ActorID,
		pgtable.EntitlementRecords.ReasonCode,
		pgtable.EntitlementRecords.StartsAt,
		pgtable.EntitlementRecords.EndsAt,
		pgtable.EntitlementRecords.CreatedAt,
		pgtable.EntitlementRecords.ClosedAt,
		pgtable.EntitlementRecords.ClosedByType,
		pgtable.EntitlementRecords.ClosedByID,
		pgtable.EntitlementRecords.ClosedReasonCode,
	).VALUES(
		record.RecordID.String(),
		record.UserID.String(),
		string(record.PlanCode),
		record.Source.String(),
		record.Actor.Type.String(),
		nullableActorID(record.Actor.ID),
		record.ReasonCode.String(),
		record.StartsAt.UTC(),
		nullableTime(record.EndsAt),
		record.CreatedAt.UTC(),
		nullableTime(record.ClosedAt),
		nullableActorType(record.ClosedBy.Type),
		nullableActorID(record.ClosedBy.ID),
		nullableReasonCode(record.ClosedReasonCode),
	)

	query, args := stmt.Sql()
	_, err := q.ExecContext(ctx, query, args...)
	if err == nil {
		return nil
	}
	if isUniqueViolation(err) {
		return fmt.Errorf("create entitlement record %q in postgres: %w", record.RecordID, ports.ErrConflict)
	}
	return fmt.Errorf("create entitlement record %q in postgres: %w", record.RecordID, err)
}

// scannableRow abstracts *sql.Row and *sql.Rows so the row-scanner can be
// shared by single-row and iterating callers.
type scannableRow interface {
	Scan(dest ...any) error
}

func scanEntitlementPeriodRow(row *sql.Row) (entitlement.PeriodRecord, error) {
	record, err := scanEntitlementPeriod(row)
	if errors.Is(err, sql.ErrNoRows) {
		return entitlement.PeriodRecord{}, ports.ErrNotFound
	}
	return record, err
}

func scanEntitlementPeriodRows(rows *sql.Rows) (entitlement.PeriodRecord, error) {
	return scanEntitlementPeriod(rows)
}

func scanEntitlementPeriod(row scannableRow) (entitlement.PeriodRecord, error) {
	var (
		recordID     string
		userID       string
		planCode     string
		source       string
		actorType    string
		actorID      *string
		reasonCode   string
		startsAt     time.Time
		endsAt       *time.Time
		createdAt    time.Time
		closedAt     *time.Time
		closedByType *string
		closedByID   *string
		closedReason *string
	)
	if err := row.Scan(
		&recordID, &userID, &planCode, &source,
		&actorType, &actorID, &reasonCode,
		&startsAt, &endsAt, &createdAt,
		&closedAt, &closedByType, &closedByID, &closedReason,
	); err != nil {
		return entitlement.PeriodRecord{}, err
	}
	record := entitlement.PeriodRecord{
		RecordID:   entitlement.EntitlementRecordID(recordID),
		UserID:     common.UserID(userID),
		PlanCode:   entitlement.PlanCode(planCode),
		Source:     common.Source(source),
		Actor:      common.ActorRef{Type: common.ActorType(actorType)},
		ReasonCode: common.ReasonCode(reasonCode),
		StartsAt:   startsAt.UTC(),
		EndsAt:     timeFromNullable(endsAt),
		CreatedAt:  createdAt.UTC(),
		ClosedAt:   timeFromNullable(closedAt),
	}
	if actorID != nil {
		record.Actor.ID = common.ActorID(*actorID)
	}
	if closedByType != nil {
		record.ClosedBy.Type = common.ActorType(*closedByType)
	}
	if closedByID != nil {
		record.ClosedBy.ID = common.ActorID(*closedByID)
	}
	if closedReason != nil {
		record.ClosedReasonCode = common.ReasonCode(*closedReason)
	}
	return record, nil
}

// GetEntitlementByUserID returns the current entitlement snapshot for userID.
func (store *Store) GetEntitlementByUserID(ctx context.Context, userID common.UserID) (entitlement.CurrentSnapshot, error) {
	if err := userID.Validate(); err != nil {
		return entitlement.CurrentSnapshot{}, fmt.Errorf("get entitlement snapshot from postgres: %w", err)
	}
	operationCtx, cancel, err := store.operationContext(ctx, "get entitlement snapshot from postgres")
	if err != nil {
		return entitlement.CurrentSnapshot{}, err
	}
	defer cancel()

	stmt := pg.SELECT(entitlementSnapshotSelectColumns).
		FROM(pgtable.EntitlementSnapshots).
		WHERE(pgtable.EntitlementSnapshots.UserID.EQ(pg.String(userID.String())))

	query, args := stmt.Sql()
	row := store.db.QueryRowContext(operationCtx, query, args...)
	record, err := scanEntitlementSnapshotRow(row)
	switch {
	case errors.Is(err, ports.ErrNotFound):
		return entitlement.CurrentSnapshot{}, fmt.Errorf("get entitlement snapshot for %q from postgres: %w", userID, ports.ErrNotFound)
	case err != nil:
		return entitlement.CurrentSnapshot{}, fmt.Errorf("get entitlement snapshot for %q from postgres: %w", userID, err)
	}
	return record, nil
}

// PutEntitlement stores the current entitlement snapshot for record.UserID.
// It is an UPSERT so the runtime path can call it on creation and on
// replacement uniformly.
func (store *Store) PutEntitlement(ctx context.Context, record entitlement.CurrentSnapshot) error {
	if err := record.Validate(); err != nil {
		return fmt.Errorf("put entitlement snapshot in postgres: %w", err)
	}
	operationCtx, cancel, err := store.operationContext(ctx, "put entitlement snapshot in postgres")
	if err != nil {
		return err
	}
	defer cancel()
	return upsertEntitlementSnapshot(operationCtx, store.db, record)
}

func upsertEntitlementSnapshot(ctx context.Context, q queryer, record entitlement.CurrentSnapshot) error {
	stmt := pgtable.EntitlementSnapshots.INSERT(
		pgtable.EntitlementSnapshots.UserID,
		pgtable.EntitlementSnapshots.PlanCode,
		pgtable.EntitlementSnapshots.IsPaid,
		pgtable.EntitlementSnapshots.StartsAt,
		pgtable.EntitlementSnapshots.EndsAt,
		pgtable.EntitlementSnapshots.Source,
		pgtable.EntitlementSnapshots.ActorType,
		pgtable.EntitlementSnapshots.ActorID,
		pgtable.EntitlementSnapshots.ReasonCode,
		pgtable.EntitlementSnapshots.UpdatedAt,
	).VALUES(
		record.UserID.String(),
		string(record.PlanCode),
		record.IsPaid,
		record.StartsAt.UTC(),
		nullableTime(record.EndsAt),
		record.Source.String(),
		record.Actor.Type.String(),
		nullableActorID(record.Actor.ID),
		record.ReasonCode.String(),
		record.UpdatedAt.UTC(),
	).ON_CONFLICT(pgtable.EntitlementSnapshots.UserID).DO_UPDATE(
		pg.SET(
			pgtable.EntitlementSnapshots.PlanCode.SET(pgtable.EntitlementSnapshots.EXCLUDED.PlanCode),
			pgtable.EntitlementSnapshots.IsPaid.SET(pgtable.EntitlementSnapshots.EXCLUDED.IsPaid),
			pgtable.EntitlementSnapshots.StartsAt.SET(pgtable.EntitlementSnapshots.EXCLUDED.StartsAt),
			pgtable.EntitlementSnapshots.EndsAt.SET(pgtable.EntitlementSnapshots.EXCLUDED.EndsAt),
			pgtable.EntitlementSnapshots.Source.SET(pgtable.EntitlementSnapshots.EXCLUDED.Source),
			pgtable.EntitlementSnapshots.ActorType.SET(pgtable.EntitlementSnapshots.EXCLUDED.ActorType),
			pgtable.EntitlementSnapshots.ActorID.SET(pgtable.EntitlementSnapshots.EXCLUDED.ActorID),
			pgtable.EntitlementSnapshots.ReasonCode.SET(pgtable.EntitlementSnapshots.EXCLUDED.ReasonCode),
			pgtable.EntitlementSnapshots.UpdatedAt.SET(pgtable.EntitlementSnapshots.EXCLUDED.UpdatedAt),
		),
	)

	query, args := stmt.Sql()
	if _, err := q.ExecContext(ctx, query, args...); err != nil {
		return fmt.Errorf("upsert entitlement snapshot for %q in postgres: %w", record.UserID, err)
	}
	return nil
}

func scanEntitlementSnapshotRow(row *sql.Row) (entitlement.CurrentSnapshot, error) {
	var (
		userID     string
		planCode   string
		isPaid     bool
		startsAt   time.Time
		endsAt     *time.Time
		source     string
		actorType  string
		actorID    *string
		reasonCode string
		updatedAt  time.Time
	)
	err := row.Scan(
		&userID, &planCode, &isPaid,
		&startsAt, &endsAt,
		&source, &actorType, &actorID, &reasonCode,
		&updatedAt,
	)
	if errors.Is(err, sql.ErrNoRows) {
		return entitlement.CurrentSnapshot{}, ports.ErrNotFound
	}
	if err != nil {
		return entitlement.CurrentSnapshot{}, err
	}
	record := entitlement.CurrentSnapshot{
		UserID:     common.UserID(userID),
		PlanCode:   entitlement.PlanCode(planCode),
		IsPaid:     isPaid,
		StartsAt:   startsAt.UTC(),
		EndsAt:     timeFromNullable(endsAt),
		Source:     common.Source(source),
		Actor:      common.ActorRef{Type: common.ActorType(actorType)},
		ReasonCode: common.ReasonCode(reasonCode),
		UpdatedAt:  updatedAt.UTC(),
	}
	if actorID != nil {
		record.Actor.ID = common.ActorID(*actorID)
	}
	return record, nil
}

// GrantEntitlement atomically closes the current free period, inserts the
// new paid period, and replaces the snapshot.
func (store *Store) GrantEntitlement(ctx context.Context, input ports.GrantEntitlementInput) error {
	if err := input.Validate(); err != nil {
		return fmt.Errorf("grant entitlement in postgres: %w", err)
	}
	return store.withTx(ctx, "grant entitlement in postgres", func(ctx context.Context, tx *sql.Tx) error {
		if err := lockSnapshotMatching(ctx, tx, input.ExpectedCurrentSnapshot); err != nil {
			return fmt.Errorf("grant entitlement for %q in postgres: %w", input.ExpectedCurrentSnapshot.UserID, err)
		}
		if err := lockPeriodMatching(ctx, tx, input.ExpectedCurrentRecord); err != nil {
			return fmt.Errorf("grant entitlement for %q in postgres: %w", input.ExpectedCurrentRecord.RecordID, err)
		}
		if err := updateEntitlementPeriodTx(ctx, tx, input.UpdatedCurrentRecord); err != nil {
			return fmt.Errorf("grant entitlement for %q in postgres: %w", input.UpdatedCurrentRecord.RecordID, err)
		}
		if err := insertEntitlementPeriod(ctx, tx, input.NewRecord); err != nil {
			return err
		}
		if err := upsertEntitlementSnapshot(ctx, tx, input.NewSnapshot); err != nil {
			return err
		}
		return nil
	})
}

// ExtendEntitlement atomically appends a new paid history segment and
// replaces the snapshot.
func (store *Store) ExtendEntitlement(ctx context.Context, input ports.ExtendEntitlementInput) error {
	if err := input.Validate(); err != nil {
		return fmt.Errorf("extend entitlement in postgres: %w", err)
	}
	return store.withTx(ctx, "extend entitlement in postgres", func(ctx context.Context, tx *sql.Tx) error {
		if err := lockSnapshotMatching(ctx, tx, input.ExpectedCurrentSnapshot); err != nil {
			return fmt.Errorf("extend entitlement for %q in postgres: %w", input.ExpectedCurrentSnapshot.UserID, err)
		}
		if err := insertEntitlementPeriod(ctx, tx, input.NewRecord); err != nil {
			return err
		}
		if err := upsertEntitlementSnapshot(ctx, tx, input.NewSnapshot); err != nil {
			return err
		}
		return nil
	})
}

// RevokeEntitlement atomically closes the current paid period, inserts a new
// free period, and replaces the snapshot.
func (store *Store) RevokeEntitlement(ctx context.Context, input ports.RevokeEntitlementInput) error {
	if err := input.Validate(); err != nil {
		return fmt.Errorf("revoke entitlement in postgres: %w", err)
	}
	return store.withTx(ctx, "revoke entitlement in postgres", func(ctx context.Context, tx *sql.Tx) error {
		if err := lockSnapshotMatching(ctx, tx, input.ExpectedCurrentSnapshot); err != nil {
			return fmt.Errorf("revoke entitlement for %q in postgres: %w", input.ExpectedCurrentSnapshot.UserID, err)
		}
		if err := lockPeriodMatching(ctx, tx, input.ExpectedCurrentRecord); err != nil {
			return fmt.Errorf("revoke entitlement for %q in postgres: %w", input.ExpectedCurrentRecord.RecordID, err)
		}
		if err := updateEntitlementPeriodTx(ctx, tx, input.UpdatedCurrentRecord); err != nil {
			return fmt.Errorf("revoke entitlement for %q in postgres: %w", input.UpdatedCurrentRecord.RecordID, err)
		}
		if err := insertEntitlementPeriod(ctx, tx, input.NewRecord); err != nil {
			return err
		}
		if err := upsertEntitlementSnapshot(ctx, tx, input.NewSnapshot); err != nil {
			return err
		}
		return nil
	})
}

// RepairExpiredEntitlement atomically replaces an expired finite paid
// snapshot with a materialised free state.
func (store *Store) RepairExpiredEntitlement(ctx context.Context, input ports.RepairExpiredEntitlementInput) error {
	if err := input.Validate(); err != nil {
		return fmt.Errorf("repair expired entitlement in postgres: %w", err)
	}
	return store.withTx(ctx, "repair expired entitlement in postgres", func(ctx context.Context, tx *sql.Tx) error {
		if err := lockSnapshotMatching(ctx, tx, input.ExpectedExpiredSnapshot); err != nil {
			return fmt.Errorf("repair expired entitlement for %q in postgres: %w", input.ExpectedExpiredSnapshot.UserID, err)
		}
		if err := insertEntitlementPeriod(ctx, tx, input.NewRecord); err != nil {
			return err
		}
		if err := upsertEntitlementSnapshot(ctx, tx, input.NewSnapshot); err != nil {
			return err
		}
		return nil
	})
}

// lockSnapshotMatching loads the current snapshot under FOR UPDATE and
// verifies it matches expected. Mismatches surface as ports.ErrConflict so
// optimistic-replacement callers can retry.
func lockSnapshotMatching(ctx context.Context, tx *sql.Tx, expected entitlement.CurrentSnapshot) error {
	stmt := pg.SELECT(entitlementSnapshotSelectColumns).
		FROM(pgtable.EntitlementSnapshots).
		WHERE(pgtable.EntitlementSnapshots.UserID.EQ(pg.String(expected.UserID.String()))).
		FOR(pg.UPDATE())

	query, args := stmt.Sql()
	row := tx.QueryRowContext(ctx, query, args...)
	current, err := scanEntitlementSnapshotRow(row)
	switch {
	case errors.Is(err, ports.ErrNotFound):
		return ports.ErrNotFound
	case err != nil:
		return err
	}
	if !snapshotsEqual(current, expected) {
		return ports.ErrConflict
	}
	return nil
}

func lockPeriodMatching(ctx context.Context, tx *sql.Tx, expected entitlement.PeriodRecord) error {
	stmt := pg.SELECT(entitlementPeriodSelectColumns).
		FROM(pgtable.EntitlementRecords).
		WHERE(pgtable.EntitlementRecords.RecordID.EQ(pg.String(expected.RecordID.String()))).
		FOR(pg.UPDATE())

	query, args := stmt.Sql()
	row := tx.QueryRowContext(ctx, query, args...)
	current, err := scanEntitlementPeriodRow(row)
	switch {
	case errors.Is(err, ports.ErrNotFound):
		return ports.ErrNotFound
	case err != nil:
		return err
	}
	if !periodsEqual(current, expected) {
		return ports.ErrConflict
	}
	return nil
}

func updateEntitlementPeriodTx(ctx context.Context, tx *sql.Tx, record entitlement.PeriodRecord) error {
	rows, err := updateEntitlementPeriod(ctx, tx, record)
	if err != nil {
		return err
	}
	if rows == 0 {
		return ports.ErrNotFound
	}
	return nil
}

func snapshotsEqual(left entitlement.CurrentSnapshot, right entitlement.CurrentSnapshot) bool {
	if left.UserID != right.UserID ||
		left.PlanCode != right.PlanCode ||
		left.IsPaid != right.IsPaid ||
		left.Source != right.Source ||
		left.Actor != right.Actor ||
		left.ReasonCode != right.ReasonCode {
		return false
	}
	if !left.StartsAt.Equal(right.StartsAt) || !left.UpdatedAt.Equal(right.UpdatedAt) {
		return false
	}
	return optionalTimeEqual(left.EndsAt, right.EndsAt)
}

func periodsEqual(left entitlement.PeriodRecord, right entitlement.PeriodRecord) bool {
	if left.RecordID != right.RecordID ||
		left.UserID != right.UserID ||
		left.PlanCode != right.PlanCode ||
		left.Source != right.Source ||
		left.Actor != right.Actor ||
		left.ReasonCode != right.ReasonCode ||
		left.ClosedBy != right.ClosedBy ||
		left.ClosedReasonCode != right.ClosedReasonCode {
		return false
	}
	if !left.StartsAt.Equal(right.StartsAt) || !left.CreatedAt.Equal(right.CreatedAt) {
		return false
	}
	if !optionalTimeEqual(left.EndsAt, right.EndsAt) {
		return false
	}
	return optionalTimeEqual(left.ClosedAt, right.ClosedAt)
}

func optionalTimeEqual(left *time.Time, right *time.Time) bool {
	switch {
	case left == nil && right == nil:
		return true
	case left == nil || right == nil:
		return false
	default:
		return left.Equal(*right)
	}
}

// EntitlementSnapshotStore adapts Store to the EntitlementSnapshotStore port.
type EntitlementSnapshotStore struct {
	store *Store
}

// EntitlementSnapshots returns one adapter that exposes the entitlement-
// snapshot store port over Store.
func (store *Store) EntitlementSnapshots() *EntitlementSnapshotStore {
	if store == nil {
		return nil
	}
	return &EntitlementSnapshotStore{store: store}
}

// GetByUserID returns the current entitlement snapshot for userID.
func (adapter *EntitlementSnapshotStore) GetByUserID(ctx context.Context, userID common.UserID) (entitlement.CurrentSnapshot, error) {
	return adapter.store.GetEntitlementByUserID(ctx, userID)
}

// Put stores the current entitlement snapshot for record.UserID.
func (adapter *EntitlementSnapshotStore) Put(ctx context.Context, record entitlement.CurrentSnapshot) error {
	return adapter.store.PutEntitlement(ctx, record)
}

var _ ports.EntitlementSnapshotStore = (*EntitlementSnapshotStore)(nil)

// EntitlementHistoryStore adapts Store to the EntitlementHistoryStore port.
type EntitlementHistoryStore struct {
	store *Store
}

// EntitlementHistory returns one adapter that exposes the entitlement
// history store port over Store.
func (store *Store) EntitlementHistory() *EntitlementHistoryStore {
	if store == nil {
		return nil
	}
	return &EntitlementHistoryStore{store: store}
}

// Create stores one new entitlement history record.
func (adapter *EntitlementHistoryStore) Create(ctx context.Context, record entitlement.PeriodRecord) error {
	return adapter.store.CreateEntitlementRecord(ctx, record)
}

// GetByRecordID returns the entitlement history record identified by
// recordID.
func (adapter *EntitlementHistoryStore) GetByRecordID(ctx context.Context, recordID entitlement.EntitlementRecordID) (entitlement.PeriodRecord, error) {
	return adapter.store.GetEntitlementRecordByID(ctx, recordID)
}

// ListByUserID returns every entitlement history record owned by userID.
func (adapter *EntitlementHistoryStore) ListByUserID(ctx context.Context, userID common.UserID) ([]entitlement.PeriodRecord, error) {
	return adapter.store.ListEntitlementRecordsByUserID(ctx, userID)
}

// Update replaces one stored entitlement history record.
func (adapter *EntitlementHistoryStore) Update(ctx context.Context, record entitlement.PeriodRecord) error {
	return adapter.store.UpdateEntitlementRecord(ctx, record)
}

var _ ports.EntitlementHistoryStore = (*EntitlementHistoryStore)(nil)

// EntitlementLifecycleStore adapts Store to the EntitlementLifecycleStore
// port.
type EntitlementLifecycleStore struct {
	store *Store
}

// EntitlementLifecycle returns one adapter that exposes the entitlement
// lifecycle store port over Store.
func (store *Store) EntitlementLifecycle() *EntitlementLifecycleStore {
	if store == nil {
		return nil
	}
	return &EntitlementLifecycleStore{store: store}
}

// Grant atomically closes the current free period and starts a new paid
// period.
func (adapter *EntitlementLifecycleStore) Grant(ctx context.Context, input ports.GrantEntitlementInput) error {
	return adapter.store.GrantEntitlement(ctx, input)
}

// Extend appends a paid history segment.
func (adapter *EntitlementLifecycleStore) Extend(ctx context.Context, input ports.ExtendEntitlementInput) error {
	return adapter.store.ExtendEntitlement(ctx, input)
}

// Revoke closes the current paid period and starts a fresh free period.
func (adapter *EntitlementLifecycleStore) Revoke(ctx context.Context, input ports.RevokeEntitlementInput) error {
	return adapter.store.RevokeEntitlement(ctx, input)
}

// RepairExpired replaces an expired finite paid snapshot with a free state.
func (adapter *EntitlementLifecycleStore) RepairExpired(ctx context.Context, input ports.RepairExpiredEntitlementInput) error {
	return adapter.store.RepairExpiredEntitlement(ctx, input)
}

var _ ports.EntitlementLifecycleStore = (*EntitlementLifecycleStore)(nil)