package shared

import (
	"context"
	"database/sql"

	"github.com/matrix-org/dendrite/common"
	"github.com/matrix-org/dendrite/syncapi/storage/tables"
	"github.com/matrix-org/dendrite/syncapi/types"
	"github.com/matrix-org/gomatrixserverlib"
)

// Database is a temporary struct until we have made syncserver.go the same for both pq/sqlite
// For now this contains the shared functions
type Database struct {
	DB          *sql.DB
	Invites     tables.Invites
	AccountData tables.AccountData
}

// AddInviteEvent stores a new invite event for a user.
// If the invite was successfully stored this returns the stream ID it was stored at.
// Returns an error if there was a problem communicating with the database.
func (d *Database) AddInviteEvent(
	ctx context.Context, inviteEvent gomatrixserverlib.HeaderedEvent,
) (sp types.StreamPosition, err error) {
	err = common.WithTransaction(d.DB, func(txn *sql.Tx) error {
		sp, err = d.Invites.InsertInviteEvent(ctx, txn, inviteEvent)
		return err
	})
	return
}

// RetireInviteEvent removes an old invite event from the database.
// Returns an error if there was a problem communicating with the database.
func (d *Database) RetireInviteEvent(
	ctx context.Context, inviteEventID string,
) error {
	// TODO: Record that invite has been retired in a stream so that we can
	// notify the user in an incremental sync.
	err := d.Invites.DeleteInviteEvent(ctx, inviteEventID)
	return err
}

// GetAccountDataInRange returns all account data for a given user inserted or
// updated between two given positions
// Returns a map following the format data[roomID] = []dataTypes
// If no data is retrieved, returns an empty map
// If there was an issue with the retrieval, returns an error
func (d *Database) GetAccountDataInRange(
	ctx context.Context, userID string, oldPos, newPos types.StreamPosition,
	accountDataFilterPart *gomatrixserverlib.EventFilter,
) (map[string][]string, error) {
	return d.AccountData.SelectAccountDataInRange(ctx, userID, oldPos, newPos, accountDataFilterPart)
}

// UpsertAccountData keeps track of new or updated account data, by saving the type
// of the new/updated data, and the user ID and room ID the data is related to (empty)
// room ID means the data isn't specific to any room)
// If no data with the given type, user ID and room ID exists in the database,
// creates a new row, else update the existing one
// Returns an error if there was an issue with the upsert
func (d *Database) UpsertAccountData(
	ctx context.Context, userID, roomID, dataType string,
) (sp types.StreamPosition, err error) {
	err = common.WithTransaction(d.DB, func(txn *sql.Tx) error {
		sp, err = d.AccountData.InsertAccountData(ctx, txn, userID, roomID, dataType)
		return err
	})
	return
}