import {
    DSQL_FieldSchemaType,
    DSQL_ForeignKeyType,
    DSQL_MYSQL_FOREIGN_KEYS_Type,
} from "../../types";
import dbHandler from "../../functions/backend/dbHandler";

type Param = {
    dbFullName: string;
    tableName: string;
    fields: DSQL_FieldSchemaType[];
    clone?: boolean;
};

/**
 * Handle MYSQL Foreign Keys
 * ===================================================
 * @description Iterate through each datasquirel schema
 * table index(if available), and perform operations
 */
export default async function handleTableForeignKey({
    dbFullName,
    tableName,
    fields,
    clone,
}: Param) {
    let addFkSQL = `ALTER TABLE \`${dbFullName}\`.\`${tableName}\``;

    for (let i = 0; i < fields.length; i++) {
        const { fieldName, foreignKey } = fields[i];

        if (!clone && foreignKey && fieldName) {
            const {
                destinationTableName,
                destinationTableColumnName,
                cascadeDelete,
                cascadeUpdate,
                foreignKeyName,
            } = foreignKey;

            addFkSQL += ` ADD CONSTRAINT \`${foreignKeyName}\` FOREIGN KEY (\`${fieldName}\`)`;
            addFkSQL += ` REFERENCES \`${destinationTableName}\`(\`${destinationTableColumnName}\`)`;

            if (cascadeDelete) addFkSQL += ` ON DELETE CASCADE`;
            if (cascadeUpdate) addFkSQL += ` ON UPDATE CASCADE`;

            addFkSQL += `,`;
        }
    }

    const finalAddFKSQL = addFkSQL.endsWith(",")
        ? addFkSQL.replace(/\,$/, "")
        : undefined;

    if (finalAddFKSQL) {
        const addForeignKey = (await dbHandler({
            query: finalAddFKSQL,
        })) as any;
    }
}