// Compliance Sandbox Service
import { Prisma } from '@prisma/client';
// Rule testing, AML scenario simulation

import prisma from '@/shared/database/prisma';
import { v4 as uuidv4 } from 'uuid';
import { supervisionEngineService } from './supervision-engine.service';


export interface SandboxScenario {
  scenarioName: string;
  scenarioType: string;
  scenarioConfig: Prisma.InputJsonValue;
}

export interface SandboxResult {
  sandboxId: string;
  scenarioName: string;
  passed: boolean;
  results: Prisma.InputJsonValue;
  errors?: string[];
}

export class SandboxService {
  /**
   * Create sandbox scenario
   */
  async createSandboxScenario(
    sovereignBankId: string,
    scenario: SandboxScenario
  ) {
    return await prisma.complianceSandbox.create({
      data: {
        id: uuidv4(),
        sandboxId: uuidv4(),
        sovereignBankId,
        scenarioType: scenario.scenarioType,
        scenarioName: scenario.scenarioName,
        scenarioConfig: scenario.scenarioConfig,
        status: 'draft',
      },
    });
  }

  /**
   * Run sandbox scenario
   */
  async runSandboxScenario(sandboxId: string): Promise<SandboxResult> {
    const sandbox = await prisma.complianceSandbox.findUnique({
      where: { sandboxId },
    });

    if (!sandbox) {
      throw new Error(`Sandbox not found: ${sandboxId}`);
    }

    // Update status to running
    await prisma.complianceSandbox.update({
      where: { sandboxId },
      data: {
        status: 'running',
        startedAt: new Date(),
      },
    });

    try {
      const results = await this.executeScenario(sandbox.scenarioType, sandbox.scenarioConfig);

      // Update with results
      await prisma.complianceSandbox.update({
        where: { sandboxId },
        data: {
          status: 'completed',
          testResults: results,
          completedAt: new Date(),
        },
      });

      return {
        sandboxId,
        scenarioName: sandbox.scenarioName,
        passed: !results.errors || results.errors.length === 0,
        results,
      };
    } catch (error) {
      await prisma.complianceSandbox.update({
        where: { sandboxId },
        data: {
          status: 'failed',
          testResults: {
            error: error instanceof Error ? error.message : 'Unknown error',
          },
          completedAt: new Date(),
        },
      });

      throw error;
    }
  }

  /**
   * Execute scenario based on type
   */
  private async executeScenario(
    scenarioType: string,
    config: Prisma.InputJsonValue
  ): Promise<Prisma.InputJsonValue> {
    switch (scenarioType) {
      case 'rule_change':
        return await this.testRuleChange(config);
      case 'aml_scenario':
        return await this.testAMLScenario(config);
      case 'policy_validation':
        return await this.testPolicyValidation(config);
      default:
        throw new Error(`Unknown scenario type: ${scenarioType}`);
    }
  }

  /**
   * Test rule change
   */
  private async testRuleChange(config: Prisma.InputJsonValue): Promise<Prisma.InputJsonValue> {
    const ruleId = config.ruleId as string;
    const newThreshold = config.newThreshold as number;

    // Get existing rule
    const rule = await prisma.supervisionRule.findUnique({
      where: { ruleId },
    });

    if (!rule) {
      return {
        errors: [`Rule not found: ${ruleId}`],
      };
    }

    // Test with sample data
    const testResults = {
      oldThreshold: rule.threshold?.toString(),
      newThreshold,
      impact: 'low', // Would calculate actual impact
      affectedTransactions: 0, // Would count affected transactions
    };

    return testResults;
  }

  /**
   * Test AML scenario
   */
  private async testAMLScenario(config: Prisma.InputJsonValue): Promise<Prisma.InputJsonValue> {
    const transactionId = config.transactionId as string;
    const sovereignBankId = config.sovereignBankId as string;

    // Run AML monitoring
    const results = await supervisionEngineService.monitorAMLBehaviors(transactionId, sovereignBankId);

    return {
      triggeredRules: results.length,
      rules: results.map((r) => ({
        ruleId: r.ruleId,
        ruleName: r.ruleName,
        severity: r.severity,
      })),
      passed: results.length === 0,
    };
  }

  /**
   * Test policy validation
   */
  private async testPolicyValidation(config: Prisma.InputJsonValue): Promise<Prisma.InputJsonValue> {
    const policy = config.policy as Prisma.InputJsonValue;
    const testCases = config.testCases as Array<Prisma.InputJsonValue>;

    const results: Array<{ testCase: string; passed: boolean; details: unknown }> = [];

    for (const testCase of testCases || []) {
      try {
        // Validate policy against test case
        const passed = this.validatePolicy(policy, testCase);
        results.push({
          testCase: testCase.name as string || 'unnamed',
          passed,
          details: testCase,
        });
      } catch (error) {
        results.push({
          testCase: testCase.name as string || 'unnamed',
          passed: false,
          details: {
            error: error instanceof Error ? error.message : 'Unknown error',
          },
        });
      }
    }

    const passedCount = results.filter((r) => r.passed).length;
    const totalCount = results.length;

    return {
      totalTests: totalCount,
      passedTests: passedCount,
      failedTests: totalCount - passedCount,
      results,
      passed: passedCount === totalCount,
    } as Prisma.InputJsonValue;
  }

  /**
   * Validate policy against test case
   */
  private validatePolicy(policy: Prisma.InputJsonValue, testCase: Prisma.InputJsonValue): boolean {
    // Simplified policy validation
    // In production, would use a policy engine
    return true;
  }

  /**
   * Get sandbox by ID
   */
  async getSandbox(sandboxId: string) {
    return await prisma.complianceSandbox.findUnique({
      where: { sandboxId },
    });
  }

  /**
   * Get sandboxes for sovereign bank
   */
  async getSandboxesForBank(sovereignBankId: string) {
    return await prisma.complianceSandbox.findMany({
      where: { sovereignBankId },
      orderBy: { createdAt: 'desc' },
    });
  }
}

export const sandboxService = new SandboxService();

