package notificationstore

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

	"galaxy/notification/internal/api/intentstream"
	"galaxy/notification/internal/service/acceptintent"
)

// Compile-time confirmation that *Store satisfies acceptintent.Store. The
// runtime wiring depends on this so the accept-intent service can consume
// the PostgreSQL adapter directly.
var _ acceptintent.Store = (*Store)(nil)

// CreateAcceptance writes one notification record together with its derived
// route slots inside one BEGIN … COMMIT transaction. Idempotency races
// surface as `acceptintent.ErrConflict`.
func (store *Store) CreateAcceptance(ctx context.Context, input acceptintent.CreateAcceptanceInput) error {
	if store == nil {
		return errors.New("create notification acceptance: nil store")
	}
	if ctx == nil {
		return errors.New("create notification acceptance: nil context")
	}
	if err := input.Validate(); err != nil {
		return fmt.Errorf("create notification acceptance: %w", err)
	}

	return store.withTx(ctx, "create notification acceptance", func(ctx context.Context, tx *sql.Tx) error {
		if err := insertRecord(ctx, tx, input.Notification, input.Idempotency.ExpiresAt); err != nil {
			if isUniqueViolation(err) {
				return acceptintent.ErrConflict
			}
			return fmt.Errorf("create notification acceptance: insert record: %w", err)
		}
		for index, route := range input.Routes {
			if err := insertRoute(ctx, tx, route); err != nil {
				return fmt.Errorf("create notification acceptance: insert route[%d]: %w", index, err)
			}
		}
		return nil
	})
}

// GetIdempotency loads one accepted idempotency reservation. Because the
// records row IS the idempotency reservation, the lookup keys on
// `(producer, idempotency_key)` and projects the relevant subset of the row
// into an IdempotencyRecord.
func (store *Store) GetIdempotency(ctx context.Context, producer intentstream.Producer, idempotencyKey string) (acceptintent.IdempotencyRecord, bool, error) {
	if store == nil {
		return acceptintent.IdempotencyRecord{}, false, errors.New("get notification idempotency: nil store")
	}
	if ctx == nil {
		return acceptintent.IdempotencyRecord{}, false, errors.New("get notification idempotency: nil context")
	}

	operationCtx, cancel, err := store.operationContext(ctx, "get notification idempotency")
	if err != nil {
		return acceptintent.IdempotencyRecord{}, false, err
	}
	defer cancel()

	scanned, found, err := loadIdempotencyByKey(operationCtx, store.db, string(producer), idempotencyKey)
	if err != nil {
		return acceptintent.IdempotencyRecord{}, false, err
	}
	if !found {
		return acceptintent.IdempotencyRecord{}, false, nil
	}
	return idempotencyRecordFromScanned(scanned), true, nil
}

// GetNotification loads one accepted notification by NotificationID.
func (store *Store) GetNotification(ctx context.Context, notificationID string) (acceptintent.NotificationRecord, bool, error) {
	if store == nil {
		return acceptintent.NotificationRecord{}, false, errors.New("get notification record: nil store")
	}
	if ctx == nil {
		return acceptintent.NotificationRecord{}, false, errors.New("get notification record: nil context")
	}

	operationCtx, cancel, err := store.operationContext(ctx, "get notification record")
	if err != nil {
		return acceptintent.NotificationRecord{}, false, err
	}
	defer cancel()

	scanned, found, err := loadRecord(operationCtx, store.db, notificationID)
	if err != nil {
		return acceptintent.NotificationRecord{}, false, err
	}
	if !found {
		return acceptintent.NotificationRecord{}, false, nil
	}
	return scanned.Record, true, nil
}

// GetRoute loads one accepted notification route by `(notificationID,
// routeID)`. Required by the publisher worker contracts.
func (store *Store) GetRoute(ctx context.Context, notificationID string, routeID string) (acceptintent.NotificationRoute, bool, error) {
	if store == nil {
		return acceptintent.NotificationRoute{}, false, errors.New("get notification route: nil store")
	}
	if ctx == nil {
		return acceptintent.NotificationRoute{}, false, errors.New("get notification route: nil context")
	}

	operationCtx, cancel, err := store.operationContext(ctx, "get notification route")
	if err != nil {
		return acceptintent.NotificationRoute{}, false, err
	}
	defer cancel()

	return loadRoute(operationCtx, store.db, notificationID, routeID)
}