import { Injectable, Logger } from '@nestjs/common';
import { PoolClient } from 'pg';
import { PgDBService } from 'src/db/db.service';
import { ActivateOrInactivateParamRecordDTO, CreateParamRecordDTO, CreateTableRecordDTO, getParamValuesDTO, SPID_DTO, UpdateParamRecordDTO } from 'src/dto/property.dto';
import { checkPgUserDefinedErrors, handlePgError, releasePgClient, ResponseStatus } from 'src/utils/helper';

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

    constructor(private readonly pgDBService: PgDBService) { }

    async GETPARAMVALUES(body: getParamValuesDTO) {
        let client: PoolClient | null = null;

        const cursorName = 'p_cursor';

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

            await client.query('BEGIN');

            const callProcQuery = `
                CALL "CARNETSYS".manageparamtable_pkg_getparamvalues($1, $2, $3)
            `;
            await client.query(callProcQuery, [body.P_SPID, body.P_PARAMTYPE, 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, ParamTableService.name)
        } finally {
            releasePgClient(client)
        }
    }

    async GETALLPARAMVALUES(body: getParamValuesDTO) {
        let client: PoolClient | null = null;

        const cursorName = 'p_cursor';

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

            await client.query('BEGIN');

            const callProcQuery = `
                CALL "CARNETSYS".manageparamtable_pkg_getallparamvalues($1, $2, $3)
            `;
            await client.query(callProcQuery, [body.P_SPID, body.P_PARAMTYPE, 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, ParamTableService.name)
        } finally {
            releasePgClient(client)
        }
    }

    async GET_COUNTRIES_AND_MESSAGES(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".manageparamtable_pkg_getcountriesandmessages($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, ParamTableService.name)
        } finally {
            releasePgClient(client)
        }
    }

    async CREATETABLERECORD(body: CreateTableRecordDTO) {
        let client: PoolClient | null = null;

        const cursorName = 'p_cursor';

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

            await client.query('BEGIN');

            const callProcQuery = `
                CALL "CARNETSYS".manageparamtable_pkg_createtablerecord($1, $2, $3)
            `;
            await client.query(callProcQuery, [body.P_USERID, body.P_TABLEFULLDESC, 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 fetchResult.rows;
            return { statusCode: 201, message: ResponseStatus.created, ...fetchResult?.rows[0] };

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

    async CREATEPARAMRECORD(body: CreateParamRecordDTO) {
        let client: PoolClient | null = null;

        const cursorName = 'p_cursor';

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

            await client.query('BEGIN');

            // Call the stored procedure
            const callProcQuery = `
            CALL "CARNETSYS".manageparamtable_pkg_createparamrecord(
                $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12
            )
        `;

            await client.query(callProcQuery, [
                body.P_SPID,
                body.P_PARAMTYPE,
                body.P_PARAMDESC,
                body.P_PARAMVALUE,
                body.P_ADDLPARAMVALUE1,
                body.P_ADDLPARAMVALUE2,
                body.P_ADDLPARAMVALUE3,
                body.P_ADDLPARAMVALUE4,
                body.P_ADDLPARAMVALUE5,
                body.P_SORTSEQ,
                body.P_USERID,
                cursorName
            ]);

            // ✅ Correct: quote the cursor name when using it in SQL
            const fetchResult = await client.query(`FETCH ALL FROM "${cursorName}"`);

            // ✅ Always close the cursor
            await client.query(`CLOSE "${cursorName}"`);
            await client.query('COMMIT');

            checkPgUserDefinedErrors(fetchResult);

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

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

    async UPDATEPARAMRECORD(body: UpdateParamRecordDTO) {
        let client: PoolClient | null = null;

        const cursorName = 'p_cursor';

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

            await client.query('BEGIN');

            const callProcQuery = `
            CALL "CARNETSYS".manageparamtable_pkg_updateparamrecord(
                $1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11
            )
        `;

            await client.query(callProcQuery, [
                body.P_SPID,
                body.P_PARAMID,
                body.P_PARAMDESC,
                body.P_ADDLPARAMVALUE1,
                body.P_ADDLPARAMVALUE2,
                body.P_ADDLPARAMVALUE3,
                body.P_ADDLPARAMVALUE4,
                body.P_ADDLPARAMVALUE5,
                body.P_SORTSEQ,
                body.P_USERID,
                cursorName
            ]);

            // ✅ Correct: quote the cursor name when using it in SQL
            const fetchResult = await client.query(`FETCH ALL FROM "${cursorName}"`);

            // ✅ Always close the cursor
            await client.query(`CLOSE "${cursorName}"`);
            await client.query('COMMIT');

            checkPgUserDefinedErrors(fetchResult);

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

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

    async INACTIVATEPARAMRECORD(body: ActivateOrInactivateParamRecordDTO) {
        let client: PoolClient | null = null;

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

            await client.query('BEGIN');

            const callProcQuery = `
                CALL "CARNETSYS".manageparamtable_pkg_inactivateparamrecord($1, $2)
            `;
            await client.query(callProcQuery, [body.P_PARAMID, body.P_USERID]);

            await client.query('COMMIT');

            return {
                statusCode: 200,
                message: ResponseStatus.inActivate
            };

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

    async REACTIVATEPARAMRECORD(body: ActivateOrInactivateParamRecordDTO) {
        let client: PoolClient | null = null;

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

            await client.query('BEGIN');

            const callProcQuery = `
                CALL "CARNETSYS".manageparamtable_pkg_reactivateparamrecord($1, $2)
            `;
            await client.query(callProcQuery, [body.P_PARAMID, body.P_USERID]);

            await client.query('COMMIT');

            return {
                statusCode: 200,
                message: ResponseStatus.reActivate
            };

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