import varDatabaseDbHandler from "../utils/varDatabaseDbHandler";
import {
    DSQL_IndexSchemaType,
    DSQL_MYSQL_SHOW_INDEXES_Type,
} from "../../types";
import grabDSQLSchemaIndexComment from "../utils/grab-dsql-schema-index-comment";

type Param = {
    tableName: string;
    dbFullName: string;
    indexes: DSQL_IndexSchemaType[];
};

/**
 * Handle DATASQUIREL Table Indexes
 * ===================================================
 * @description Iterate through each datasquirel schema
 * table index(if available), and perform operations
 */
export default async function handleIndexescreateDbFromSchema({
    dbFullName,
    tableName,
    indexes,
}: Param) {
    const allExistingIndexes: DSQL_MYSQL_SHOW_INDEXES_Type[] =
        await varDatabaseDbHandler({
            queryString: `SHOW INDEXES FROM \`${dbFullName}\`.\`${tableName}\``,
        });

    for (let g = 0; g < indexes.length; g++) {
        const { indexType, indexName, indexTableFields, alias } = indexes[g];

        if (!alias?.match(/./)) continue;

        /**
         * @description Check for existing Index in MYSQL db
         */
        try {
            const existingKeyInDb = allExistingIndexes.filter(
                (indexObject) => indexObject.Key_name === alias
            );

            if (!existingKeyInDb[0])
                throw new Error("This Index Does not Exist");
        } catch (error) {
            /**
             * @description Create new index if determined that it
             * doesn't exist in MYSQL db
             */
            const queryString = `CREATE${
                indexType == "full_text" ? " FULLTEXT" : ""
            } INDEX \`${alias}\` ON \`${dbFullName}\`.\`${tableName}\`(${indexTableFields
                ?.map((nm) => nm.value)
                .map((nm) => `\`${nm}\``)
                .join(
                    ","
                )}) COMMENT '${grabDSQLSchemaIndexComment()} ${indexName}'`;

            const addIndex = await varDatabaseDbHandler({ queryString });
        }
    }

    const allExistingIndexesAfterUpdate: DSQL_MYSQL_SHOW_INDEXES_Type[] =
        await varDatabaseDbHandler({
            queryString: `SHOW INDEXES FROM \`${dbFullName}\`.\`${tableName}\``,
        });
}