/**
 * Regions Repository
 * Handles CRUD operations for provider regions
 */

import { BaseRepository } from './base';
import { Region, RegionInput, RepositoryError, ErrorCodes } from '../types';

export class RegionsRepository extends BaseRepository<Region> {
  protected tableName = 'regions';
  protected allowedColumns = [
    'provider_id',
    'region_code',
    'region_name',
    'country_code',
    'latitude',
    'longitude',
    'available',
  ];

  /**
   * Find all regions for a specific provider
   */
  async findByProvider(providerId: number): Promise<Region[]> {
    try {
      const result = await this.db
        .prepare('SELECT * FROM regions WHERE provider_id = ?')
        .bind(providerId)
        .all<Region>();

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

  /**
   * Find a region by provider ID and region code
   */
  async findByCode(providerId: number, code: string): Promise<Region | null> {
    try {
      const result = await this.db
        .prepare('SELECT * FROM regions WHERE provider_id = ? AND region_code = ?')
        .bind(providerId, code)
        .first<Region>();

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

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

    try {
      // Build upsert statements for each region
      const statements = regions.map((region) => {
        return this.db.prepare(
          `INSERT INTO regions (
            provider_id, region_code, region_name, country_code, 
            latitude, longitude, available
          ) VALUES (?, ?, ?, ?, ?, ?, ?)
          ON CONFLICT(provider_id, region_code) 
          DO UPDATE SET
            region_name = excluded.region_name,
            country_code = excluded.country_code,
            latitude = excluded.latitude,
            longitude = excluded.longitude,
            available = excluded.available`
        ).bind(
          providerId,
          region.region_code,
          region.region_name,
          region.country_code || null,
          region.latitude || null,
          region.longitude || null,
          region.available
        );
      });

      // Count successful operations
      const successCount = await this.executeBatchCount(statements);

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

  /**
   * Get available regions only
   */
  async findAvailable(providerId?: number): Promise<Region[]> {
    try {
      let query = 'SELECT * FROM regions WHERE available = 1';
      const params: (string | number | boolean | null)[] = [];

      if (providerId !== undefined) {
        query += ' AND provider_id = ?';
        params.push(providerId);
      }

      const result = await this.db
        .prepare(query)
        .bind(...params)
        .all<Region>();

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

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

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

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

      if (error instanceof RepositoryError) {
        throw error;
      }

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