const pool = require('../data/database');
const { logError, logInfo } = require('../utils/logger');

class TicketSyncModel {

    static async createSyncRecord(data) {
        try {

            const query = `INSERT INTO ticket_sync (
            sn_ticket_id,
            glpi_ticket_id,
            last_sn_sync,
            last_glpi_sync,
            created_at,
            updated_at,
            sn_sync_status,
            glpi_sync_status,
            source_last
            ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9) RETURNING id`;

            const values = [
                data.sn_ticket_id,
                data.glpi_ticket_id,
                data.last_sn_sync,
                data.last_glpi_sync,
                data.created_at,
                data.updated_at,
                data.sn_sync_status,
                data.glpi_sync_status,
                data.source_last
            ]


            await pool.query(query, values);   
            
        } catch (error) {
            logError(error, 'ERRO: Erro ao criar registro de sincronizacao');
            throw error;
        }
    }

    static async getTicketsToSync(glpi_sync_status, sn_sync_status) {
        try {
            const query = 'SELECT id, glpi_ticket_id, sn_ticket_id FROM ticket_sync WHERE glpi_sync_status = $1 AND sn_sync_status = $2';
            const values =[glpi_sync_status , sn_sync_status];
            const { rows } = await pool.query(query, values);
            return rows;
        } catch (error) {
            logError(error, 'ERRO: Erro ao buscar tickets para sincronizar');
            throw error;
        }
    }

    static async updateSourceLast(snTicketId, source) {
        try {
            const query = 'UPDATE ticket_sync SET source_last = $1 WHERE sn_ticket_id = $2';
            await pool.query(query, [source, snTicketId]);
        } catch (error) {
            logError(error, `ERRO: Erro ao atualizar source_last para o ticket SN ID: ${snTicketId}`);
            throw error;
        }
    }

    static async updateStatus(ticketSyncId, glpiStatus, snStatus) {
        try {
            const query = 'UPDATE ticket_sync SET glpi_sync_status = $1, sn_sync_status = $2 WHERE sn_ticket_id = $3';
            await pool.query(query, [glpiStatus, snStatus, ticketSyncId]);
        } catch (error) {
            logError(`${error} ERRO: Erro ao atualizar status de sincronizacao para o ID: ${ticketSyncId}`);
            throw error;
        }
    }

    static async updateStatusAndSourceLast(ticketSyncId, glpiStatus, snStatus, source_last) {
        try {

            const query = 'UPDATE ticket_sync SET glpi_sync_status = $1, sn_sync_status= $2, source_last = $4 WHERE sn_ticket_id = $3';
            await pool.query(query, [glpiStatus, snStatus, ticketSyncId, source_last]);
        } catch (error) {
            logError(`${error} ERRO: Erro ao atualizar status de sincronizacao para o ID: ${ticketSyncId}`);
            throw error;
        }
    }

    static async updateStatusAndGlpiTicket(ticketSyncId, glpiStatus, snStatus, glpiTicketId) {
        try {
            const query = 'UPDATE ticket_sync SET glpi_sync_status = $1, sn_sync_status = $2, glpi_ticket_id = $4 WHERE sn_ticket_id = $3';
            await pool.query(query, [glpiStatus, snStatus, ticketSyncId, glpiTicketId]);
        } catch (error) {
            logError(error, `ERRO: Erro ao atualizar status de sincronizacao para o ID: ${ticketSyncId}`);
            throw error;
        }
    }

    static async getIdSyncByGlpiId(glpiTicketId) {
        try {
            const query = 'SELECT id FROM ticket_sync WHERE glpi_ticket_id = $1';
            const { rows } = await pool.query(query, [glpiTicketId]);
            return rows[0] ? rows[0].id : null;
        } catch (error) {
            logError(error, `ERRO: Erro ao buscar ID de sincronizacao por GLPI ID: ${glpiTicketId}`);
            throw error;
        }
    }

    static async getBySysId(sysId) {
        try {
            const query = `
                SELECT tsync.* FROM ticket_sync tsync
                JOIN tickets_sn tsn ON tsync.sn_ticket_id = tsn.id
                WHERE tsn.sys_id = $1`;
            const { rows } = await pool.query(query, [sysId]);
            return rows[0] || null;
        } catch (error) {
            logError(error, `ERRO: Erro ao buscar registro de sincronizacao por sys_id: ${sysId}`);
            throw error;
        }
    }

    static async getIdSyncBySnId(snTicketId) {
        try {
            const query = 'SELECT id FROM ticket_sync WHERE sn_ticket_id = $1';
            const { rows } = await pool.query(query, [snTicketId]);
            return rows[0] ? rows[0].id : null;
        } catch (error) {
            logError(error, `ERRO: Erro ao buscar ID de sincronizacao por SN ID: ${snTicketId}`);
            throw error;
        }
    }

    static async getByTicketNumber(ticketNumber) {
        try {
            const query = 'SELECT * FROM ticket_sync WHERE sn_ticket_id = $1';
            const { rows } = await pool.query(query, [ticketNumber]);
            return rows[0] || null;

        } catch (error) {
            logError(`${error}, ERRO: Erro ao buscar ticket ${ticketNumber}}` )
        }
        
    }

    static async getTicketsSynced() {
        try {
            const query = `
                SELECT 
                    tsync.id, 
                    tsync.glpi_ticket_id, 
                    tsync.sn_ticket_id,
                    tsn.sys_id,
                    tsync.source_last
                FROM ticket_sync tsync
                JOIN tickets_sn tsn ON tsync.sn_ticket_id = tsn.id
                WHERE tsync.glpi_sync_status = 'synced' AND tsync.sn_sync_status = 'synced'`;
            const { rows } = await pool.query(query);
            return rows;
        } catch (error) {
            logError(error, 'ERRO: Erro ao buscar tickets para sincronizar');
            throw error;
        }
    }

    static async getTicketsToMonitor() {
        try {
            const query = `
                SELECT 
                    tsync.id, 
                    tsync.glpi_ticket_id, 
                    tsync.sn_ticket_id,
                    tsn.sys_id,
                    tsync.source_last,
                    tsync.sn_sync_status,
                    tsync.glpi_sync_status
                FROM ticket_sync tsync
                JOIN tickets_sn tsn ON tsync.sn_ticket_id = tsn.id
                WHERE (tsync.glpi_sync_status IN ('synced', 'solved') OR tsync.sn_sync_status IN ('synced', 'solved'))
                  AND (tsync.glpi_sync_status != 'closed' AND tsync.sn_sync_status != 'closed')`;
            const { rows } = await pool.query(query);
            return rows;
        } catch (error) {
            logError(error, 'ERRO: Erro ao buscar tickets para monitorar');
            throw error;
        }
    }

    static async getTicketsPendingSolve() {
        try {
            const query = `
                SELECT 
                    tsync.id, 
                    tsync.glpi_ticket_id, 
                    tsync.sn_ticket_id,
                    tsync.glpi_sync_status,
                    tsync.sn_sync_status,
                    tsn.sys_id,
                    tsn.tipo
                FROM ticket_sync tsync
                JOIN tickets_sn tsn ON tsync.sn_ticket_id = tsn.id
                WHERE tsync.glpi_sync_status = 'pending_solve' OR tsync.sn_sync_status = 'pending_solve'`;
            const { rows } = await pool.query(query);
            return rows;
        } catch (error) {
            logError(error, 'ERRO: Erro ao buscar tickets pendentes de fechamento');
            throw error;
        }
    }

    static async getTicketsInErrorState() {
        try {
            const query = `
                SELECT id, sn_ticket_id, glpi_ticket_id, sn_sync_status, glpi_sync_status
                FROM ticket_sync
                WHERE sn_sync_status LIKE '%error%' OR glpi_sync_status LIKE '%error%'
            `;
            const { rows } = await pool.query(query);
            return rows;
        } catch (error) {
            logError(error, 'ERRO: Erro ao buscar tickets em estado de erro');
            throw error;
        }
    }

    static async updateLastSync(snTicketId, system) {
        try {
            let fieldToUpdate;
            if (system === 'servicenow') {
                fieldToUpdate = 'last_sn_sync';
            } else if (system === 'glpi') {
                fieldToUpdate = 'last_glpi_sync';
            } else {
                return;
            }
            const query = `UPDATE ticket_sync SET ${fieldToUpdate} = NOW() WHERE sn_ticket_id = $1`;
            await pool.query(query, [snTicketId]);
        } catch (error) {
            logError(`${error} ERRO: Erro ao atualizar last_sync para o ID: ${snTicketId}`);
        }
    }

    static async updateStatusByGlpiId(glpiTicketId, snStatus, glpiStatus) {
        try {
            const query = 'UPDATE ticket_sync SET sn_sync_status = $1, glpi_sync_status = $2 WHERE glpi_ticket_id = $3';
            await pool.query(query, [snStatus, glpiStatus, glpiTicketId]);
        } catch (error) {
            logError(`${error} ERRO: Erro ao atualizar status de sincronizacao para o GLPI ID: ${glpiTicketId}`);
            throw error;
        }
    }


}
/**
 * @module TicketSyncModel
 * @description Este modulo e a camada de acesso a tabela `ticket_sync`, que atua como o cerebro do processo de sincronizacao.
 * Ele armazena o estado de cada ticket em ambos os sistemas (GLPI e ServiceNow) e controla o fluxo de atualizacoes.
 *
 * Principais Funcionalidades:
 * - **Gerenciamento de Estado**: Metodos como `updateStatus`, `updateStatusAndSourceLast` e `updateStatusAndGlpiTicket` sao usados para modificar os status de sincronizacao (ex: 'pending_check', 'synced', 'solved', 'closed', 'error').
 * - **Controle de Fluxo (`source_last`)**: A coluna `source_last` e gerenciada por este modelo para indicar qual sistema realizou a ultima modificacao, prevenindo atualizacoes conflitantes (race conditions).
 * - **Selecao de Tickets para Processamento**: Metodos como `getTicketsToMonitor`, `getTicketsInErrorState`, e `getTicketsSynced` fornecem listas de tickets para os diferentes controladores processarem, com base em seus status atuais.
 * - **Criacao e Consulta**: `createSyncRecord` cria o registro inicial de um ticket, e varias funcoes de busca (`getBySysId`, `getIdSyncByGlpiId`, etc.) permitem localizar registros de sincronizacao.
 *
 * A tabela `ticket_sync` e a fonte da verdade para o estado da integracao de cada ticket individualmente.
 */


module.exports = TicketSyncModel;