import {
    DSQL_MYSQL_FOREIGN_KEYS_Type,
    DSQL_MYSQL_SHOW_INDEXES_Type,
    DSQL_UniqueConstraintSchemaType,
} from "../../types";
import dbHandler from "../../functions/backend/dbHandler";
import AppData from "../../data/app-data";
import normalizeText from "../../utils/normalize-text";

type Param = {
    tableName: string;
    dbFullName: string;
    tableUniqueConstraints: DSQL_UniqueConstraintSchemaType[];
};

/**
 * Handle DATASQUIREL Table Unique Constraints
 * ===================================================
 * @description Iterate through each datasquirel schema
 * table unique constraint(if available), and perform operations
 */
export default async function handleUniqueConstraintsCreateDbFromSchema({
    dbFullName,
    tableName,
    tableUniqueConstraints,
}: Param) {
    /**
     * # Delete All Existing Unique Constraints
     */
    // const allExistingUniqueConstraints = (await dbHandler({
    //     query: `SHOW INDEXES FROM \`${dbFullName}\`.\`${tableName}\` WHERE Index_comment LIKE '%${AppData["UniqueConstraintComment"]}%'`,
    // })) as DSQL_MYSQL_SHOW_INDEXES_Type[] | null;

    // if (allExistingUniqueConstraints?.[0]) {
    //     for (let f = 0; f < allExistingUniqueConstraints.length; f++) {
    //         const { Key_name } = allExistingUniqueConstraints[f];

    //         try {
    //             const existingKeyInSchema = tableUniqueConstraints?.find(
    //                 (indexObject) => indexObject.alias === Key_name
    //             );
    //             if (!existingKeyInSchema)
    //                 throw new Error(
    //                     `This Index(${Key_name}) Has been Deleted!`
    //                 );
    //         } catch (error) {
    //             /**
    //              * @description Drop Index: This happens when the MYSQL index is not
    //              * present in the datasquirel DB schema
    //              */
    //             await dbHandler({
    //                 query: `ALTER TABLE \`${dbFullName}\`.\`${tableName}\` DROP INDEX \`${Key_name}\``,
    //             });
    //         }
    //     }
    // }

    /**
     * # Re-Add New Constraints
     */
    for (let g = 0; g < tableUniqueConstraints.length; g++) {
        const { constraintName, alias, constraintTableFields } =
            tableUniqueConstraints[g];

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

        /**
         * @description Create new index if determined that it
         * doesn't exist in MYSQL db
         */
        const queryString = `CREATE UNIQUE INDEX \`${alias}\` ON \`${dbFullName}\`.\`${tableName}\`(${constraintTableFields
            ?.map((nm) => nm.value)
            .map((nm) => `\`${nm}\``)
            .join(",")}) COMMENT '${
            AppData["UniqueConstraintComment"]
        } ${constraintName}'`;

        const addIndex = await dbHandler({ query: queryString });
    }
}