import { Injectable } from '@nestjs/common';
import { OracleDBService } from 'src/db/db.service';
import { AuthLoginDTO } from './auth.dto';
import * as oracledb from 'oracledb'

@Injectable()
export class AuthService {

    constructor(private readonly oracleDBService: OracleDBService) { }

    async login(body:AuthLoginDTO) {
        let connection;
        let rows = [];
        let crows:any = [];
        try {
            connection = await this.oracleDBService.getConnection()
            if (!connection) {
                throw new Error('No DB Connected')
            }

            const result = await connection.execute(
                `BEGIN
                    USERLOGIN_PKG.ValidateUser(:p_emailaddr,:p_password,:p_login_cursor);
                END;`,
                {
                    p_emailaddr: {
                        val: body.p_emailaddr,
                        type: oracledb.DB_TYPE_NVARCHAR
                    },
                    p_password: {
                        val: body.p_password,
                        type: oracledb.DB_TYPE_NVARCHAR
                    },
                    p_login_cursor: {
                        type: oracledb.CURSOR,
                        dir: oracledb.BIND_OUT
                    }
                },
                {
                    outFormat: oracledb.OUT_FORMAT_OBJECT
                }
            );

            if (result.outBinds && result.outBinds.p_login_cursor) {
                const cursor = result.outBinds.p_login_cursor; // The OUT cursor
                let rowsBatch;

                do {
                    rowsBatch = await cursor.getRows(100); // Fetch 100 rows at a time
                    rows = rows.concat(rowsBatch); // Append fetched rows to the main array
                } while (rowsBatch.length > 0);

                console.log('Rows fetched:', rows);

                // Close the cursor after you're done
                await cursor.close();
            } else {
                throw new Error('No cursor returned from the stored procedure');
            }

            // if (result.outBinds && result.outBinds.p_carnet_count_cur) {
            //     const cursor = result.outBinds.p_carnet_count_cur; // The OUT cursor
            //     let rowsBatch;

            //     do {
            //         rowsBatch = await cursor.getRows(100); // Fetch 100 rows at a time
            //         crows = crows.concat(rowsBatch); // Append fetched rows to the main array
            //     } while (rowsBatch.length > 0);

            //     console.log('Rows fetched:', crows);

            //     // Close the cursor after you're done
            //     await cursor.close();
            // } else {
            //     throw new Error('No cursor returned from the stored procedure');
            // }

            // crows = crows.map(obj => {
            //     // Create a new object to hold the modified keys
            //     let newObj = {};
                
            //     // Iterate over the keys of the current object
            //     for (let key in obj) {
            //         // Replace spaces with underscores in the key
            //         let newKey = key.replace(/ /g, "_");
            //         newObj[newKey] = obj[key];
            //     }
                
            //     return newObj;
            // });

            // crows = crows.reduce((acc, curr) => {
            //     // Find if the current item already exists in the accumulator
            //     let existing = acc.find(item => item["Service_Provider_Name"] === curr["Service_Provider_Name"] && item.SPID === curr.SPID);
                
            //     if (existing) {
            //         // If it exists, push the current "cs" and "c c" values into the arrays
            //         existing.CARNETSTATUS.push(curr.CARNETSTATUS);
            //         existing["Carnet_Count"].push(curr["Carnet_Count"]);
            //     } else {
            //         // If it doesn't exist, create a new entry
            //         acc.push({
            //             "Service_Provider_Name": curr["Service_Provider_Name"],
            //             SPID: curr.SPID,
            //             CARNETSTATUS: [curr.CARNETSTATUS],
            //             "Carnet_Count": [curr["Carnet_Count"]]
            //         });
            //     }
                
            //     return acc;
            // }, []);

            // if(!crows[0].SPID){
            //     return {error:"Invalid username or password"}
            // }

            // return {rows,chartResult:crows};

            if(rows[0]["ERRORMESG"]){
                return {error:"Invalid username or password!"}
            }
            return {msg:"Logged in successfully"}

        } catch (err) {
            console.error('Error fetching users: ', err.message);
            // throw new Error('Error fetching users');
            return {error:"Invalid username or password"}
        } finally { }


    }
}