import { Injectable, Logger } from '@nestjs/common';
import { PgDBService } from 'src/db/db.service';
import { InsertRegionsDto, SPID_DTO, UpdateRegionDto } from 'src/dto/property.dto';
import { InternalServerException } from 'src/exceptions/internalServerError.exception';

import { PoolClient } from 'pg';
import { checkPgUserDefinedErrors, handlePgError, releasePgClient, ResponseStatus } from 'src/utils/helper';

@Injectable()
export class RegionService {
    private readonly logger = new Logger(RegionService.name);

    constructor(private readonly pgDBService: PgDBService) { }

    async insertRegions(body: InsertRegionsDto) {
        let client: PoolClient | null = null;

        const cursorName = 'p_cursor';

        try {
            client = await this.pgDBService.getConnection();

            await client.query('BEGIN');

            const callProcQuery = `
                                CALL "CARNETSYS".uscib_managed_pkg_insertnewregion($1, $2, $3, $4)
                            `;
            await client.query(callProcQuery, [body.P_REGION, body.P_NAME, body.P_SPID, cursorName]);

            // 🚫 DON'T quote the cursor name in FETCH
            const fetchResult = await client.query(`FETCH ALL FROM ${cursorName}`);

            // 🚫 DON'T quote the cursor name in CLOSE
            await client.query(`CLOSE ${cursorName}`);
            await client.query('COMMIT');

            checkPgUserDefinedErrors(fetchResult);

            return {
                statusCode: 201,
                message: ResponseStatus.created,
                ...fetchResult?.rows?.[0] || {}
            };

        } catch (error) {
            if (client) await client.query('ROLLBACK');
            handlePgError(error, RegionService.name)
        } finally {
            releasePgClient(client)
        }
    }

    async updateRegions(body: UpdateRegionDto) {
        let client: PoolClient | null = null;

        const cursorName = 'p_cursor';

        try {
            client = await this.pgDBService.getConnection();

            await client.query('BEGIN');

            const callProcQuery = `
                                CALL "CARNETSYS".uscib_managed_pkg_updateregion($1, $2, $3)
                            `;
            await client.query(callProcQuery, [body.P_REGIONID, body.P_NAME, cursorName]);

            // 🚫 DON'T quote the cursor name in FETCH
            const fetchResult = await client.query(`FETCH ALL FROM ${cursorName}`);

            // 🚫 DON'T quote the cursor name in CLOSE
            await client.query(`CLOSE ${cursorName}`);
            await client.query('COMMIT');

            checkPgUserDefinedErrors(fetchResult);

            return { statusCode: 200, message: ResponseStatus.updated, ...fetchResult?.rows[0] || {} };

        } catch (error) {
            if (client) await client.query('ROLLBACK');
            handlePgError(error, RegionService.name)
        } finally {
            releasePgClient(client)
        }
    }

    async getRegions(body: SPID_DTO) {

        let client: PoolClient | null = null;

        const cursorName = 'p_cursor';

        try {
            client = await this.pgDBService.getConnection();

            await client.query('BEGIN');

            const callProcQuery = `
                                CALL "CARNETSYS".uscib_managed_pkg_getregions($1, $2)
                            `;
            await client.query(callProcQuery, [body.P_SPID, cursorName]);

            // 🚫 DON'T quote the cursor name in FETCH
            const fetchResult = await client.query(`FETCH ALL FROM ${cursorName}`);

            // 🚫 DON'T quote the cursor name in CLOSE
            await client.query(`CLOSE ${cursorName}`);
            await client.query('COMMIT');

            return fetchResult.rows;

        } catch (error) {
            if (client) await client.query('ROLLBACK');
            handlePgError(error, RegionService.name)
        } finally {
            releasePgClient(client)
        }

    }
}