/**
 * Veeam Sync Service
 * Orchestrates syncing VSPC data to PostgreSQL
 */

import postgresClient from './postgres-client';
import { VeeamClient } from './veeam-client';
import { getVeeamClient } from './veeam-factory';
import {
  VspcOrganization,
  VspcBackupServer,
  VspcBackupJob,
  VspcBackupAgentJob,
  VspcProtectedWorkload,
  VspcRepository,
} from '@/lib/types/veeam';
import { VeeamComplianceService } from './veeam-compliance-service';

export interface VeeamSyncResult {
  syncId: string;
  syncType: 'full' | 'incremental';
  status: 'completed' | 'failed';
  startedAt: Date;
  completedAt: Date;
  duration: number;
  entities: VeeamEntitySyncResult[];
  errors: string[];
}

export interface VeeamEntitySyncResult {
  entity: string;
  success: boolean;
  recordsUpserted: number;
  duration: number;
  error?: string;
}

export class VeeamSyncService {
  private client: VeeamClient;
  private isSyncing = false;

  constructor(client?: VeeamClient) {
    this.client = client || getVeeamClient();
  }

  isSyncInProgress(): boolean {
    return this.isSyncing;
  }

  /**
   * Full sync — fetches all entities and upserts into PostgreSQL
   */
  async fullSync(triggeredBy: string = 'system'): Promise<VeeamSyncResult> {
    return this.executeSync('full', triggeredBy);
  }

  /**
   * Incremental sync — same as full for now since VSPC API doesn't support
   * filtering by last-modified. We upsert all records so unchanged rows are no-ops.
   */
  async incrementalSync(triggeredBy: string = 'system'): Promise<VeeamSyncResult> {
    return this.executeSync('incremental', triggeredBy);
  }

  private async executeSync(syncType: 'full' | 'incremental', triggeredBy: string): Promise<VeeamSyncResult> {
    if (this.isSyncing) {
      throw new Error('A Veeam sync operation is already in progress');
    }

    this.isSyncing = true;
    const syncId = `veeam-${Date.now()}`;
    const startTime = new Date();
    const entityResults: VeeamEntitySyncResult[] = [];
    const errors: string[] = [];

    // Create sync history record
    let historyId: number | null = null;
    try {
      const histResult = await postgresClient.query<{ id: number }>(
        `INSERT INTO sync_history (entity_type, sync_type, status, started_at, records_added, records_updated, records_deleted, triggered_by)
         VALUES ($1, $2, $3, $4, 0, 0, 0, $5) RETURNING id`,
        ['veeam', syncType, 'started', startTime, triggeredBy]
      );
      historyId = histResult.rows[0].id;
    } catch (e) {
      console.warn('[VEEAM-SYNC] Could not create sync history record:', e);
    }

    console.log(`[VEEAM-SYNC] Starting ${syncType} sync (${syncId})`);

    try {
      // Sync in dependency order
      const steps: Array<{ name: string; fn: () => Promise<number> }> = [
        { name: 'organizations', fn: () => this.syncOrganizations() },
        { name: 'backup_servers', fn: () => this.syncBackupServers() },
        { name: 'repositories', fn: () => this.syncRepositories() },
        { name: 'backup_jobs', fn: () => this.syncBackupJobs() },
        { name: 'backup_agent_jobs', fn: () => this.syncBackupAgentJobs() },
        { name: 'protected_workloads', fn: () => this.syncProtectedWorkloads() },
      ];

      for (const step of steps) {
        const stepStart = Date.now();
        try {
          const count = await step.fn();
          const duration = Date.now() - stepStart;
          entityResults.push({ entity: step.name, success: true, recordsUpserted: count, duration });
          console.log(`[VEEAM-SYNC] ${step.name}: ${count} records in ${duration}ms`);
        } catch (error) {
          const duration = Date.now() - stepStart;
          const msg = error instanceof Error ? error.message : String(error);
          errors.push(`${step.name}: ${msg}`);
          entityResults.push({ entity: step.name, success: false, recordsUpserted: 0, duration, error: msg });
          console.error(`[VEEAM-SYNC] ${step.name} failed:`, msg);
        }
      }

      const completedAt = new Date();
      const duration = completedAt.getTime() - startTime.getTime();
      const status = errors.length === 0 ? 'completed' : 'failed';

      const totalRecords = entityResults.reduce((sum, r) => sum + r.recordsUpserted, 0);
      console.log(`[VEEAM-SYNC] Sync ${status} in ${duration}ms — ${totalRecords} total records`);

      // Run compliance computation after successful sync
      if (status === 'completed') {
        try {
          const complianceService = new VeeamComplianceService();
          await complianceService.computeCompliance();
        } catch (compError) {
          console.error('[VEEAM-SYNC] Compliance computation failed:', compError);
        }
      }

      // Update sync history
      if (historyId) {
        try {
          await postgresClient.query(
            `UPDATE sync_history SET status = $1, completed_at = $2, records_added = $3, error_message = $4 WHERE id = $5`,
            [status, completedAt, totalRecords, errors.length > 0 ? errors.join('; ') : null, historyId]
          );
        } catch (e) {
          console.warn('[VEEAM-SYNC] Could not update sync history:', e);
        }
      }

      return { syncId, syncType, status, startedAt: startTime, completedAt, duration, entities: entityResults, errors };
    } catch (error) {
      const completedAt = new Date();
      const msg = error instanceof Error ? error.message : String(error);
      console.error('[VEEAM-SYNC] Sync failed catastrophically:', msg);

      if (historyId) {
        try {
          await postgresClient.query(
            `UPDATE sync_history SET status = 'failed', completed_at = $1, error_message = $2 WHERE id = $3`,
            [completedAt, msg, historyId]
          );
        } catch (e) { /* ignore */ }
      }

      return {
        syncId, syncType, status: 'failed', startedAt: startTime, completedAt,
        duration: completedAt.getTime() - startTime.getTime(), entities: entityResults, errors: [msg],
      };
    } finally {
      this.isSyncing = false;
    }
  }

  // ============================================================================
  // Entity Sync Methods
  // ============================================================================

  private async syncOrganizations(): Promise<number> {
    const orgs = await this.client.getOrganizations();
    if (orgs.length === 0) return 0;

    let count = 0;
    for (const org of orgs) {
      const parsed = org.companyId ? parseInt(org.companyId, 10) : null;
      const companyId = parsed && !isNaN(parsed) ? parsed : null;
      // Verify company exists in Autotask if companyId is set
      let matchedCompanyId = companyId;
      if (companyId) {
        const check = await postgresClient.query(
          'SELECT id FROM companies WHERE id = $1', [companyId]
        );
        if (check.rows.length === 0) {
          matchedCompanyId = null;
        }
      }

      await postgresClient.query(
        `INSERT INTO veeam_organizations (instance_uid, name, type, company_id, tax_id, email, phone, country, state, city, street, zip_code, website, notes, synced_at)
         VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13,$14,NOW())
         ON CONFLICT (instance_uid) DO UPDATE SET
           name=EXCLUDED.name, type=EXCLUDED.type, company_id=EXCLUDED.company_id,
           tax_id=EXCLUDED.tax_id, email=EXCLUDED.email, phone=EXCLUDED.phone,
           country=EXCLUDED.country, state=EXCLUDED.state, city=EXCLUDED.city,
           street=EXCLUDED.street, zip_code=EXCLUDED.zip_code, website=EXCLUDED.website,
           notes=EXCLUDED.notes, synced_at=NOW(), updated_at=NOW()`,
        [
          org.instanceUid, org.name, org.type, matchedCompanyId,
          org.taxId || null, org.email || null, org.phone || null,
          org.countryName || null, org.regionName || null, org.city || null,
          org.street || null, org.zipCode || null, org.website || null, org.notes || null,
        ]
      );
      count++;
    }
    return count;
  }

  private async syncBackupServers(): Promise<number> {
    const servers = await this.client.getBackupServers();
    if (servers.length === 0) return 0;

    // Build set of known org UIDs for FK safety
    const knownOrgs = await postgresClient.query('SELECT instance_uid FROM veeam_organizations');
    const orgUids = new Set(knownOrgs.rows.map((r: any) => r.instance_uid));

    let count = 0;
    for (const s of servers) {
      const orgUid = orgUids.has(s.organizationUid) ? s.organizationUid : null;
      await postgresClient.query(
        `INSERT INTO veeam_backup_servers (instance_uid, name, organization_uid, version, display_version, status, backup_server_role_type, installation_uid, location_uid, management_agent_uid, synced_at)
         VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,NOW())
         ON CONFLICT (instance_uid) DO UPDATE SET
           name=EXCLUDED.name, organization_uid=EXCLUDED.organization_uid,
           version=EXCLUDED.version, display_version=EXCLUDED.display_version,
           status=EXCLUDED.status, backup_server_role_type=EXCLUDED.backup_server_role_type,
           installation_uid=EXCLUDED.installation_uid, location_uid=EXCLUDED.location_uid,
           management_agent_uid=EXCLUDED.management_agent_uid, synced_at=NOW(), updated_at=NOW()`,
        [
          s.instanceUid, s.name, orgUid, s.version, s.displayVersion,
          s.status, s.backupServerRoleType, s.installationUid, s.locationUid, s.managementAgentUid,
        ]
      );
      count++;
    }
    return count;
  }

  private async syncBackupJobs(): Promise<number> {
    const jobs = await this.client.getBackupJobs();
    if (jobs.length === 0) return 0;

    // Build sets for FK safety
    const knownOrgs = await postgresClient.query('SELECT instance_uid FROM veeam_organizations');
    const orgUids = new Set(knownOrgs.rows.map((r: any) => r.instance_uid));
    const knownServers = await postgresClient.query('SELECT instance_uid FROM veeam_backup_servers');
    const serverUids = new Set(knownServers.rows.map((r: any) => r.instance_uid));

    let count = 0;
    for (const j of jobs) {
      const orgUid = orgUids.has(j.organizationUid) ? j.organizationUid : null;
      const serverUid = serverUids.has(j.backupServerUid) ? j.backupServerUid : null;
      await postgresClient.query(
        `INSERT INTO veeam_backup_jobs (instance_uid, unique_uid, name, description, backup_server_uid, organization_uid, status, type, last_run, last_end_time, last_duration, processing_rate, avg_duration, transferred_data, backup_chain_size, bottleneck, is_enabled, schedule_type, failure_message, target_type, destination, retention_limit, retention_limit_type, is_gfs_option_enabled, synced_at)
         VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13,$14,$15,$16,$17,$18,$19,$20,$21,$22,$23,$24,NOW())
         ON CONFLICT (instance_uid) DO UPDATE SET
           unique_uid=EXCLUDED.unique_uid, name=EXCLUDED.name, description=EXCLUDED.description,
           backup_server_uid=EXCLUDED.backup_server_uid, organization_uid=EXCLUDED.organization_uid,
           status=EXCLUDED.status, type=EXCLUDED.type, last_run=EXCLUDED.last_run,
           last_end_time=EXCLUDED.last_end_time, last_duration=EXCLUDED.last_duration,
           processing_rate=EXCLUDED.processing_rate, avg_duration=EXCLUDED.avg_duration,
           transferred_data=EXCLUDED.transferred_data, backup_chain_size=EXCLUDED.backup_chain_size,
           bottleneck=EXCLUDED.bottleneck, is_enabled=EXCLUDED.is_enabled,
           schedule_type=EXCLUDED.schedule_type, failure_message=EXCLUDED.failure_message,
           target_type=EXCLUDED.target_type, destination=EXCLUDED.destination,
           retention_limit=EXCLUDED.retention_limit, retention_limit_type=EXCLUDED.retention_limit_type,
           is_gfs_option_enabled=EXCLUDED.is_gfs_option_enabled, synced_at=NOW(), updated_at=NOW()`,
        [
          j.instanceUid, j.uniqueUid, j.name, j.description || null,
          serverUid, orgUid, j.status, j.type,
          j.lastRun || null, j.lastEndTime || null, j.lastDuration, j.processingRate,
          j.avgDuration, j.transferredData, j.backupChainSize, j.bottleneck,
          j.isEnabled, j.scheduleType, j.failureMessage || null,
          j.targetType, j.destination, j.retentionLimit, j.retentionLimitType,
          j.isGfsOptionEnabled,
        ]
      );
      count++;
    }
    return count;
  }

  private async syncBackupAgentJobs(): Promise<number> {
    const jobs = await this.client.getBackupAgentJobs();
    if (jobs.length === 0) return 0;

    // Build set for FK safety
    const knownOrgs = await postgresClient.query('SELECT instance_uid FROM veeam_organizations');
    const orgUids = new Set(knownOrgs.rows.map((r: any) => r.instance_uid));

    let count = 0;
    for (const j of jobs) {
      const orgUid = orgUids.has(j.organizationUid) ? j.organizationUid : null;
      await postgresClient.query(
        `INSERT INTO veeam_backup_agent_jobs (instance_uid, original_uid, backup_agent_uid, organization_uid, name, description, config_uid, system_type, backup_policy_uid, backup_policy_name, backup_policy_assign_status, backup_policy_failure_message, status, operation_mode, destination, restore_points, last_run, last_end_time, last_duration, next_run, avg_duration, backup_mode, target_type, is_enabled, schedule_type, failure_message, backed_up_size, free_space, synced_at)
         VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13,$14,$15,$16,$17,$18,$19,$20,$21,$22,$23,$24,$25,$26,$27,$28,NOW())
         ON CONFLICT (instance_uid) DO UPDATE SET
           original_uid=EXCLUDED.original_uid, backup_agent_uid=EXCLUDED.backup_agent_uid,
           organization_uid=EXCLUDED.organization_uid, name=EXCLUDED.name, description=EXCLUDED.description,
           config_uid=EXCLUDED.config_uid, system_type=EXCLUDED.system_type,
           backup_policy_uid=EXCLUDED.backup_policy_uid, backup_policy_name=EXCLUDED.backup_policy_name,
           backup_policy_assign_status=EXCLUDED.backup_policy_assign_status,
           backup_policy_failure_message=EXCLUDED.backup_policy_failure_message,
           status=EXCLUDED.status, operation_mode=EXCLUDED.operation_mode,
           destination=EXCLUDED.destination, restore_points=EXCLUDED.restore_points,
           last_run=EXCLUDED.last_run, last_end_time=EXCLUDED.last_end_time,
           last_duration=EXCLUDED.last_duration, next_run=EXCLUDED.next_run,
           avg_duration=EXCLUDED.avg_duration, backup_mode=EXCLUDED.backup_mode,
           target_type=EXCLUDED.target_type, is_enabled=EXCLUDED.is_enabled,
           schedule_type=EXCLUDED.schedule_type, failure_message=EXCLUDED.failure_message,
           backed_up_size=EXCLUDED.backed_up_size, free_space=EXCLUDED.free_space,
           synced_at=NOW(), updated_at=NOW()`,
        [
          j.instanceUid, j.originalUid, j.backupAgentUid, orgUid,
          j.name || j.backupPolicyName || 'Unknown', j.description || null, j.configUid, j.systemType,
          j.backupPolicyUid, j.backupPolicyName, j.backupPolicyAssignStatus,
          j.backupPolicyFailureMessage || null, j.status, j.operationMode,
          j.destination, j.restorePoints, j.lastRun || null, j.lastEndTime || null,
          j.lastDuration, j.nextRun || null, j.avgDuration, j.backupMode,
          j.targetType, j.isEnabled, j.scheduleType, j.failureMessage || null,
          j.backedUpSize, j.freeSpace,
        ]
      );
      count++;
    }
    return count;
  }

  private async syncProtectedWorkloads(): Promise<number> {
    const workloads = await this.client.getProtectedWorkloads();
    if (workloads.length === 0) return 0;

    // Build sets for FK safety
    const knownOrgs = await postgresClient.query('SELECT instance_uid FROM veeam_organizations');
    const orgUids = new Set(knownOrgs.rows.map((r: any) => r.instance_uid));
    const knownServers = await postgresClient.query('SELECT instance_uid FROM veeam_backup_servers');
    const serverUids = new Set(knownServers.rows.map((r: any) => r.instance_uid));

    let count = 0;
    for (const w of workloads) {
      const orgUid = orgUids.has(w.organizationUid) ? w.organizationUid : null;
      const serverUid = serverUids.has(w.backupServerUid) ? w.backupServerUid : null;
      await postgresClient.query(
        `INSERT INTO veeam_protected_workloads (instance_uid, name, backup_server_uid, organization_uid, job_uid, ip_addresses, provisioned_source_size, used_source_size, total_restore_point_size, latest_restore_point_size, restore_points, latest_restore_point_date, malware_state, immutable, synced_at)
         VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,$13,$14,NOW())
         ON CONFLICT (instance_uid) DO UPDATE SET
           name=EXCLUDED.name, backup_server_uid=EXCLUDED.backup_server_uid,
           organization_uid=EXCLUDED.organization_uid, job_uid=EXCLUDED.job_uid,
           ip_addresses=EXCLUDED.ip_addresses, provisioned_source_size=EXCLUDED.provisioned_source_size,
           used_source_size=EXCLUDED.used_source_size, total_restore_point_size=EXCLUDED.total_restore_point_size,
           latest_restore_point_size=EXCLUDED.latest_restore_point_size, restore_points=EXCLUDED.restore_points,
           latest_restore_point_date=EXCLUDED.latest_restore_point_date, malware_state=EXCLUDED.malware_state,
           immutable=EXCLUDED.immutable, synced_at=NOW(), updated_at=NOW()`,
        [
          w.instanceUid, w.name, serverUid, orgUid,
          w.jobUid, w.ipAddresses ? JSON.stringify(w.ipAddresses) : null,
          w.provisionedSourceSize, w.usedSourceSize, w.totalRestorePointSize,
          w.latestRestorePointSize, w.restorePoints, w.latestRestorePointDate || null,
          w.malwareState, w.immutable,
        ]
      );
      count++;
    }
    return count;
  }

  private async syncRepositories(): Promise<number> {
    const repos = await this.client.getRepositories();
    if (repos.length === 0) return 0;

    // Build set for FK safety
    const knownServers = await postgresClient.query('SELECT instance_uid FROM veeam_backup_servers');
    const serverUids = new Set(knownServers.rows.map((r: any) => r.instance_uid));

    let count = 0;
    for (const r of repos) {
      const serverUid = serverUids.has(r.backupServerUid) ? r.backupServerUid : null;
      await postgresClient.query(
        `INSERT INTO veeam_repositories (instance_uid, name, backup_server_uid, capacity_bytes, free_space_bytes, used_space_bytes, repository_type, synced_at)
         VALUES ($1,$2,$3,$4,$5,$6,$7,NOW())
         ON CONFLICT (instance_uid) DO UPDATE SET
           name=EXCLUDED.name, backup_server_uid=EXCLUDED.backup_server_uid,
           capacity_bytes=EXCLUDED.capacity_bytes, free_space_bytes=EXCLUDED.free_space_bytes,
           used_space_bytes=EXCLUDED.used_space_bytes, repository_type=EXCLUDED.repository_type,
           synced_at=NOW(), updated_at=NOW()`,
        [
          r.instanceUid, r.name, serverUid,
          r.capacityBytes || null, r.freeSpaceBytes || null,
          r.usedSpaceBytes || null, r.repositoryType || null,
        ]
      );
      count++;
    }
    return count;
  }
}