/**
 * Anvil Instances Repository
 * Handles CRUD operations for Anvil-branded instance specifications
 */

import { BaseRepository } from './base';
import { AnvilInstance, AnvilInstanceInput, RepositoryError, ErrorCodes } from '../types';

export class AnvilInstancesRepository extends BaseRepository<AnvilInstance> {
  protected tableName = 'anvil_instances';
  protected allowedColumns = [
    'name',
    'display_name',
    'category',
    'vcpus',
    'memory_gb',
    'disk_gb',
    'transfer_tb',
    'network_gbps',
    'gpu_model',
    'gpu_vram_gb',
    'active',
  ];

  /**
   * Find an instance by name (e.g., "anvil-1g-1c")
   */
  async findByName(name: string): Promise<AnvilInstance | null> {
    try {
      const result = await this.db
        .prepare('SELECT * FROM anvil_instances WHERE name = ?')
        .bind(name)
        .first<AnvilInstance>();

      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 instance by name: ${name}`,
        ErrorCodes.DATABASE_ERROR,
        error
      );
    }
  }

  /**
   * Find all instances by category
   */
  async findByCategory(category: 'vm' | 'gpu' | 'g8' | 'vpu'): Promise<AnvilInstance[]> {
    try {
      const result = await this.db
        .prepare('SELECT * FROM anvil_instances WHERE category = ? ORDER BY name')
        .bind(category)
        .all<AnvilInstance>();

      return result.results;
    } catch (error) {
      this.logger.error('findByCategory failed', {
        category,
        error: error instanceof Error ? error.message : 'Unknown error'
      });
      throw new RepositoryError(
        `Failed to find Anvil instances by category: ${category}`,
        ErrorCodes.DATABASE_ERROR,
        error
      );
    }
  }

  /**
   * Get all active instances
   */
  async findActive(category?: 'vm' | 'gpu' | 'g8' | 'vpu'): Promise<AnvilInstance[]> {
    try {
      let query = 'SELECT * FROM anvil_instances WHERE active = 1';
      const params: (string | number | boolean | null)[] = [];

      if (category) {
        query += ' AND category = ?';
        params.push(category);
      }

      query += ' ORDER BY name';

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

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

  /**
   * Search instances by resource requirements
   */
  async searchByResources(
    minVcpus?: number,
    minMemoryGb?: number,
    minDiskGb?: number,
    category?: 'vm' | 'gpu' | 'g8' | 'vpu'
  ): Promise<AnvilInstance[]> {
    try {
      const conditions: string[] = ['active = 1'];
      const params: (string | number | boolean | null)[] = [];

      if (minVcpus !== undefined) {
        conditions.push('vcpus >= ?');
        params.push(minVcpus);
      }

      if (minMemoryGb !== undefined) {
        conditions.push('memory_gb >= ?');
        params.push(minMemoryGb);
      }

      if (minDiskGb !== undefined) {
        conditions.push('disk_gb >= ?');
        params.push(minDiskGb);
      }

      if (category) {
        conditions.push('category = ?');
        params.push(category);
      }

      const query = 'SELECT * FROM anvil_instances WHERE ' + conditions.join(' AND ') + ' ORDER BY memory_gb, vcpus';

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

      return result.results;
    } catch (error) {
      this.logger.error('searchByResources failed', {
        minVcpus,
        minMemoryGb,
        minDiskGb,
        category,
        error: error instanceof Error ? error.message : 'Unknown error'
      });
      throw new RepositoryError(
        'Failed to search Anvil instances by resources',
        ErrorCodes.DATABASE_ERROR,
        error
      );
    }
  }

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

      if (!result) {
        throw new RepositoryError(
          `Anvil instance 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 instance active status: ${id}`,
        ErrorCodes.DATABASE_ERROR,
        error
      );
    }
  }

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

    try {
      const statements = instances.map((instance) => {
        return this.db.prepare(
          `INSERT INTO anvil_instances (
            name, display_name, category, vcpus, memory_gb, disk_gb,
            transfer_tb, network_gbps, gpu_model, gpu_vram_gb, active
          ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
          ON CONFLICT(name)
          DO UPDATE SET
            display_name = excluded.display_name,
            category = excluded.category,
            vcpus = excluded.vcpus,
            memory_gb = excluded.memory_gb,
            disk_gb = excluded.disk_gb,
            transfer_tb = excluded.transfer_tb,
            network_gbps = excluded.network_gbps,
            gpu_model = excluded.gpu_model,
            gpu_vram_gb = excluded.gpu_vram_gb,
            active = excluded.active`
        ).bind(
          instance.name,
          instance.display_name,
          instance.category,
          instance.vcpus,
          instance.memory_gb,
          instance.disk_gb,
          instance.transfer_tb,
          instance.network_gbps,
          instance.gpu_model,
          instance.gpu_vram_gb,
          instance.active
        );
      });

      const successCount = await this.executeBatchCount(statements);

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