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,:p_carnet_count_cur);
                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
                    },
                    p_carnet_count_cur: {
                        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;
            }, []);

            return {rows,chartResult:crows};

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


    }
}