/**
 * Anvil Regions Repository
 * Handles CRUD operations for Anvil-branded regional datacenters
 */

import { BaseRepository } from './base';
import { AnvilRegion, AnvilRegionInput, RepositoryError, ErrorCodes } from '../types';
import { createLogger } from '../utils/logger';

export class AnvilRegionsRepository extends BaseRepository<AnvilRegion> {
  protected tableName = 'anvil_regions';
  protected logger = createLogger('[AnvilRegionsRepository]');
  protected allowedColumns = [
    'name',
    'display_name',
    'country_code',
    'source_provider',
    'source_region_code',
    'source_region_id',
    'active',
  ];

  /**
   * Find a region by name (e.g., "anvil-tyo1")
   */
  async findByName(name: string): Promise<AnvilRegion | null> {
    try {
      const result = await this.db
        .prepare('SELECT * FROM anvil_regions WHERE name = ?')
        .bind(name)
        .first<AnvilRegion>();

      return result || null;
    } catch (error) {
      this.logger.error('findByName failed', {
        name,
        error: error instanceof Error ? error.message : 'Unknown error'
      });
      throw new RepositoryError(
        `Failed to find Anvil region by name: ${name}`,
        ErrorCodes.DATABASE_ERROR,
        error
      );
    }
  }

  /**
   * Find all regions for a country
   */
  async findByCountry(countryCode: string): Promise<AnvilRegion[]> {
    try {
      const result = await this.db
        .prepare('SELECT * FROM anvil_regions WHERE country_code = ? ORDER BY name')
        .bind(countryCode)
        .all<AnvilRegion>();

      return result.results;
    } catch (error) {
      this.logger.error('findByCountry failed', {
        countryCode,
        error: error instanceof Error ? error.message : 'Unknown error'
      });
      throw new RepositoryError(
        `Failed to find Anvil regions for country: ${countryCode}`,
        ErrorCodes.DATABASE_ERROR,
        error
      );
    }
  }

  /**
   * Find region by source region ID
   */
  async findBySourceRegion(sourceRegionId: number): Promise<AnvilRegion | null> {
    try {
      const result = await this.db
        .prepare('SELECT * FROM anvil_regions WHERE source_region_id = ?')
        .bind(sourceRegionId)
        .first<AnvilRegion>();

      return result || null;
    } catch (error) {
      this.logger.error('findBySourceRegion failed', {
        sourceRegionId,
        error: error instanceof Error ? error.message : 'Unknown error'
      });
      throw new RepositoryError(
        `Failed to find Anvil region by source region: ${sourceRegionId}`,
        ErrorCodes.DATABASE_ERROR,
        error
      );
    }
  }

  /**
   * Get all active regions
   */
  async findActive(): Promise<AnvilRegion[]> {
    try {
      const result = await this.db
        .prepare('SELECT * FROM anvil_regions WHERE active = 1 ORDER BY name')
        .all<AnvilRegion>();

      return result.results;
    } catch (error) {
      this.logger.error('findActive failed', {
        error: error instanceof Error ? error.message : 'Unknown error'
      });
      throw new RepositoryError(
        'Failed to find active Anvil regions',
        ErrorCodes.DATABASE_ERROR,
        error
      );
    }
  }

  /**
   * Update region active status
   */
  async updateActive(id: number, active: boolean): Promise<AnvilRegion> {
    try {
      const result = await this.db
        .prepare('UPDATE anvil_regions SET active = ? WHERE id = ? RETURNING *')
        .bind(active ? 1 : 0, id)
        .first<AnvilRegion>();

      if (!result) {
        throw new RepositoryError(
          `Anvil region not found: ${id}`,
          ErrorCodes.NOT_FOUND
        );
      }

      return result;
    } catch (error) {
      this.logger.error('updateActive failed', {
        id,
        active,
        error: error instanceof Error ? error.message : 'Unknown error'
      });

      if (error instanceof RepositoryError) {
        throw error;
      }

      throw new RepositoryError(
        `Failed to update Anvil region active status: ${id}`,
        ErrorCodes.DATABASE_ERROR,
        error
      );
    }
  }

  /**
   * Bulk upsert regions
   * Uses batch operations for efficiency
   */
  async upsertMany(regions: AnvilRegionInput[]): Promise<number> {
    if (regions.length === 0) {
      return 0;
    }

    try {
      const statements = regions.map((region) => {
        return this.db.prepare(
          `INSERT INTO anvil_regions (
            name, display_name, country_code, source_provider,
            source_region_code, source_region_id, active
          ) VALUES (?, ?, ?, ?, ?, ?, ?)
          ON CONFLICT(name)
          DO UPDATE SET
            display_name = excluded.display_name,
            country_code = excluded.country_code,
            source_provider = excluded.source_provider,
            source_region_code = excluded.source_region_code,
            source_region_id = excluded.source_region_id,
            active = excluded.active`
        ).bind(
          region.name,
          region.display_name,
          region.country_code,
          region.source_provider,
          region.source_region_code,
          region.source_region_id,
          region.active
        );
      });

      const results = await this.executeBatch(statements);

      const successCount = results.reduce(
        (sum, result) => sum + (result.meta.changes ?? 0),
        0
      );

      this.logger.info('Upserted Anvil regions', { count: successCount });
      return successCount;
    } catch (error) {
      this.logger.error('upsertMany failed', {
        count: regions.length,
        error: error instanceof Error ? error.message : 'Unknown error'
      });
      throw new RepositoryError(
        'Failed to upsert Anvil regions',
        ErrorCodes.TRANSACTION_FAILED,
        error
      );
    }
  }
}