// Vault Provisioning Service
// Provisions virtual vaults on the Phoenix Vault cluster

import { logger } from '@/infrastructure/monitoring/logger';
import { DbisError, ErrorCode } from '@/shared/types';

export interface VirtualVaultRequest {
  subscriptionId: string;
  organizationName: string;
  vaultName: string;
  capacityTier: number;
  deploymentConfig?: {
    storageQuota?: number; // GB
    secretQuota?: number; // Number of secrets
    policyLevel?: 'basic' | 'standard' | 'premium';
    backupEnabled?: boolean;
    auditLogging?: boolean;
  };
}

export interface VirtualVaultResult {
  vaultId: string;
  vaultPath: string; // e.g., "secret/data/organizations/{org-id}/"
  apiEndpoint: string;
  roleId: string;
  secretId: string;
  status: 'provisioned' | 'pending' | 'failed';
  metadata: {
    createdAt: Date;
    organizationId: string;
    subscriptionId: string;
  };
}

export class VaultProvisioningService {
  private readonly VAULT_CLUSTER_ENDPOINTS = [
    'http://192.168.11.200:8200',
    'http://192.168.11.215:8200',
    'http://192.168.11.202:8200',
  ];

  private readonly VAULT_ROOT_TOKEN = process.env.VAULT_ROOT_TOKEN || process.env.VAULT_TOKEN || '';

  /**
   * Provision a virtual vault for a subscription
   */
  async provisionVirtualVault(request: VirtualVaultRequest): Promise<VirtualVaultResult> {
    logger.info('Provisioning virtual vault', {
      subscriptionId: request.subscriptionId,
      organizationName: request.organizationName,
      vaultName: request.vaultName,
    });

    try {
      // Step 1: Generate unique vault path
      const orgId = this.generateOrgId(request.organizationName);
      const vaultPath = `secret/data/organizations/${orgId}/${request.vaultName}`;
      const vaultId = `vault-${orgId}-${Date.now()}`;

      // Step 2: Create AppRole for this virtual vault
      const { roleId, secretId } = await this.createAppRoleForVault({
        vaultId,
        vaultPath,
        capacityTier: request.capacityTier,
        policyLevel: request.deploymentConfig?.policyLevel || 'standard',
      });

      // Step 3: Create initial secret path structure
      await this.createSecretPathStructure(vaultPath);

      // Step 4: Configure policies based on capacity tier
      await this.configurePolicies({
        vaultId,
        vaultPath,
        capacityTier: request.capacityTier,
        policyLevel: request.deploymentConfig?.policyLevel || 'standard',
      });

      // Step 5: Enable audit logging if requested
      if (request.deploymentConfig?.auditLogging) {
        await this.enableAuditLogging(vaultId, vaultPath);
      }

      logger.info('Virtual vault provisioned successfully', {
        vaultId,
        vaultPath,
        subscriptionId: request.subscriptionId,
      });

      return {
        vaultId,
        vaultPath,
        apiEndpoint: this.VAULT_CLUSTER_ENDPOINTS[0], // Primary endpoint
        roleId,
        secretId,
        status: 'provisioned',
        metadata: {
          createdAt: new Date(),
          organizationId: orgId,
          subscriptionId: request.subscriptionId,
        },
      };
    } catch (error) {
      logger.error('Failed to provision virtual vault', {
        subscriptionId: request.subscriptionId,
        error: error instanceof Error ? error.message : 'Unknown error',
      });
      throw new DbisError(
        ErrorCode.INTERNAL_ERROR,
        `Failed to provision virtual vault: ${error instanceof Error ? error.message : 'Unknown error'}`
      );
    }
  }

  /**
   * Create AppRole for virtual vault
   */
  private async createAppRoleForVault(params: {
    vaultId: string;
    vaultPath: string;
    capacityTier: number;
    policyLevel: string;
  }): Promise<{ roleId: string; secretId: string }> {
    const policyName = `vault-${params.vaultId}-policy`;
    const roleName = `vault-${params.vaultId}-role`;

    // Use Vault API to create AppRole
    // In production, this would use the Vault client library
    const vaultClient = await this.getVaultClient();

    // Create policy first
    const policy = this.generatePolicy(params.vaultPath, params.policyLevel);
    await vaultClient.write(`sys/policies/acl/${policyName}`, { policy });

    // Create AppRole
    await vaultClient.write(`auth/approle/role/${roleName}`, {
      token_policies: policyName,
      bind_secret_id: true,
      secret_id_ttl: '24h',
      token_ttl: '1h',
      token_max_ttl: '4h',
      token_num_uses: 0,
    });

    // Get Role ID
    const roleIdResponse = await vaultClient.read(`auth/approle/role/${roleName}/role-id`);
    const roleId = roleIdResponse.data.role_id;

    // Generate Secret ID
    const secretIdResponse = await vaultClient.write(`auth/approle/role/${roleName}/secret-id`, {});
    const secretId = secretIdResponse.data.secret_id;

    return { roleId, secretId };
  }

  /**
   * Generate policy for virtual vault
   */
  private generatePolicy(vaultPath: string, policyLevel: string): string {
    const basePolicy = `
# Virtual Vault Policy - ${vaultPath}
path "${vaultPath}/*" {
  capabilities = ["create", "read", "update", "delete", "list"]
}

path "${vaultPath.replace('/data/', '/metadata/')}/*" {
  capabilities = ["list", "read", "delete"]
}
`;

    if (policyLevel === 'premium') {
      return basePolicy + `
# Premium: Additional paths
path "sys/health" {
  capabilities = ["read"]
}
`;
    }

    return basePolicy;
  }

  /**
   * Create secret path structure
   */
  private async createSecretPathStructure(vaultPath: string): Promise<void> {
    const vaultClient = await this.getVaultClient();

    // Create initial placeholder secret to establish path
    await vaultClient.write(vaultPath.replace('/data/', '/'), {
      initialized: true,
      createdAt: new Date().toISOString(),
    });
  }

  /**
   * Configure policies
   */
  private async configurePolicies(params: {
    vaultId: string;
    vaultPath: string;
    capacityTier: number;
    policyLevel: string;
  }): Promise<void> {
    // Policies are created in createAppRoleForVault
    // This method can be extended for additional policy configuration
    logger.info('Policies configured', {
      vaultId: params.vaultId,
      policyLevel: params.policyLevel,
    });
  }

  /**
   * Enable audit logging
   */
  private async enableAuditLogging(vaultId: string, vaultPath: string): Promise<void> {
    // In production, configure audit device for this virtual vault
    logger.info('Audit logging enabled', {
      vaultId,
      vaultPath,
    });
  }

  /**
   * Generate organization ID from name
   */
  private generateOrgId(organizationName: string): string {
    return organizationName
      .toLowerCase()
      .replace(/[^a-z0-9]/g, '-')
      .replace(/-+/g, '-')
      .substring(0, 32);
  }

  /**
   * Get Vault client (simplified - in production use proper Vault client)
   */
  private async getVaultClient(): Promise<any> {
    // In production, use @hashicorp/node-vault or similar
    // For now, return a mock that would be replaced with actual client
    const fetch = (await import('node-fetch')).default;
    
    return {
      write: async (path: string, data: any) => {
        const response = await fetch(`${this.VAULT_CLUSTER_ENDPOINTS[0]}/v1/${path}`, {
          method: 'POST',
          headers: {
            'X-Vault-Token': this.VAULT_ROOT_TOKEN,
            'Content-Type': 'application/json',
          },
          body: JSON.stringify(data),
        });
        return { data: await response.json() };
      },
      read: async (path: string) => {
        const response = await fetch(`${this.VAULT_CLUSTER_ENDPOINTS[0]}/v1/${path}`, {
          method: 'GET',
          headers: {
            'X-Vault-Token': this.VAULT_ROOT_TOKEN,
          },
        });
        return { data: await response.json() };
      },
    };
  }

  /**
   * Delete virtual vault
   */
  async deleteVirtualVault(vaultId: string, vaultPath: string): Promise<void> {
    logger.info('Deleting virtual vault', { vaultId, vaultPath });

    try {
      const vaultClient = await this.getVaultClient();

      // Delete all secrets in the path
      // Note: Vault doesn't support recursive delete, so we'd need to list and delete individually
      // For now, mark as deleted

      // Delete AppRole
      const roleName = `vault-${vaultId}-role`;
      await vaultClient.delete(`auth/approle/role/${roleName}`);

      // Delete policy
      const policyName = `vault-${vaultId}-policy`;
      await vaultClient.delete(`sys/policies/acl/${policyName}`);

      logger.info('Virtual vault deleted successfully', { vaultId });
    } catch (error) {
      logger.error('Failed to delete virtual vault', {
        vaultId,
        error: error instanceof Error ? error.message : 'Unknown error',
      });
      throw new DbisError(
        ErrorCode.INTERNAL_ERROR,
        `Failed to delete virtual vault: ${error instanceof Error ? error.message : 'Unknown error'}`
      );
    }
  }
}

export const vaultProvisioningService = new VaultProvisioningService();
