import { DSQL_DatabaseSchemaType } from "../../../types";
import _ from "lodash";

type Params = {
    dbSchema: DSQL_DatabaseSchemaType;
    userId: string | number;
};

export default function resolveSchemaForeignKeys({ dbSchema, userId }: Params) {
    let newDbSchema = _.cloneDeep(dbSchema);

    for (let t = 0; t < newDbSchema.tables.length; t++) {
        const tableSchema = newDbSchema.tables[t];

        for (let f = 0; f < tableSchema.fields.length; f++) {
            const fieldSchema = tableSchema.fields[f];

            if (fieldSchema.foreignKey?.destinationTableColumnName) {
                const fkDestinationTableIndex = newDbSchema.tables.findIndex(
                    (tbl) =>
                        tbl.tableName ==
                        fieldSchema.foreignKey?.destinationTableName
                );

                /**
                 * Delete current Foreign Key if related table doesn't exist
                 * or has been deleted
                 */
                if (fkDestinationTableIndex < 0) {
                    delete newDbSchema.tables[t].fields[f].foreignKey;
                    continue;
                }
            }
        }
    }

    return newDbSchema;
}