import { Request, Response } from 'express';

export class PermissionTestService {
  /**
   * 测试权限控制
   * @param params 测试参数
   * @param traceInfo 追踪信息
   * @returns 权限测试结果
   */
  public static async testPermissions(
    params: {
      users: Array<{
        id: string;
        role: string;
        permissions: string[];
      }>;
      resources: Array<{
        id: string;
        type: string;
        requiredPermission: string;
      }>;
    },
    traceInfo: {
      tenantId: string;
      shopId: string;
      taskId: string;
      traceId: string;
      businessType: 'TOC' | 'TOB';
    }
  ): Promise<{
    timestamp: string;
    totalTests: number;
    passedTests: number;
    failedTests: number;
    results: Array<{
      userId: string;
      role: string;
      resourceId: string;
      resourceType: string;
      requiredPermission: string;
      hasPermission: boolean;
      expected: boolean;
      passed: boolean;
    }>;
    recommendations: string[];
  }> {
    try {
      const timestamp = new Date().toISOString();
      const results = [];
      let totalTests = 0;
      let passedTests = 0;
      let failedTests = 0;
      
      for (const user of params.users) {
        for (const resource of params.resources) {
          totalTests++;
          
          // 检查用户是否有必要的权限
          const hasPermission = user.permissions.includes(resource.requiredPermission) || user.role === 'ADMIN';
          
          // 预期结果（模拟权限规则）
          const expected = user.permissions.includes(resource.requiredPermission) || user.role === 'ADMIN';
          
          // 验证测试结果
          const passed = hasPermission === expected;
          
          if (passed) {
            passedTests++;
          } else {
            failedTests++;
          }
          
          results.push({
            userId: user.id,
            role: user.role,
            resourceId: resource.id,
            resourceType: resource.type,
            requiredPermission: resource.requiredPermission,
            hasPermission,
            expected,
            passed,
          });
        }
      }
      
      // 生成权限管理建议
      const recommendations = [
        'Implement role-based access control (RBAC)',
        'Define clear permission hierarchies',
        'Regularly review and update permissions',
        'Implement least privilege principle',
        'Add permission audit logging',
        'Test permissions regularly',
      ];
      
      return {
        timestamp,
        totalTests,
        passedTests,
        failedTests,
        results,
        recommendations,
      };
    } catch (error) {
      console.error('Error testing permissions:', error);
      throw new Error('Failed to test permissions');
    }
  }

  /**
   * 测试角色权限
   * @param params 测试参数
   * @param traceInfo 追踪信息
   * @returns 角色权限测试结果
   */
  public static async testRolePermissions(
    params: {
      roles: Array<{
        name: string;
        permissions: string[];
      }>;
      requiredPermissions: Array<{
        resource: string;
        action: string;
        permission: string;
      }>;
    },
    traceInfo: {
      tenantId: string;
      shopId: string;
      taskId: string;
      traceId: string;
      businessType: 'TOC' | 'TOB';
    }
  ): Promise<{
    timestamp: string;
    rolesTested: number;
    permissionsTested: number;
    missingPermissions: number;
    results: Array<{
      role: string;
      permissions: Array<{
        resource: string;
        action: string;
        permission: string;
        hasPermission: boolean;
        status: 'granted' | 'missing';
      }>;
      missingCount: number;
    }>;
  }> {
    try {
      const timestamp = new Date().toISOString();
      const results = [];
      let rolesTested = 0;
      let permissionsTested = 0;
      let missingPermissions = 0;
      
      for (const role of params.roles) {
        rolesTested++;
        const roleResults = {
          role: role.name,
          permissions: [] as Array<{
            resource: string;
            action: string;
            permission: string;
            hasPermission: boolean;
            status: 'granted' | 'missing';
          }>,
          missingCount: 0,
        };
        
        for (const reqPerm of params.requiredPermissions) {
          permissionsTested++;
          const hasPermission = role.permissions.includes(reqPerm.permission);
          const status: 'granted' | 'missing' = hasPermission ? 'granted' : 'missing';
          
          if (!hasPermission) {
            missingPermissions++;
            roleResults.missingCount++;
          }
          
          roleResults.permissions.push({
            resource: reqPerm.resource,
            action: reqPerm.action,
            permission: reqPerm.permission,
            hasPermission,
            status,
          });
        }
        
        results.push(roleResults);
      }
      
      return {
        timestamp,
        rolesTested,
        permissionsTested,
        missingPermissions,
        results,
      };
    } catch (error) {
      console.error('Error testing role permissions:', error);
      throw new Error('Failed to test role permissions');
    }
  }

  /**
   * 测试权限边界
   * @param params 测试参数
   * @param traceInfo 追踪信息
   * @returns 权限边界测试结果
   */
  public static async testPermissionBoundaries(
    params: {
      users: Array<{
        id: string;
        role: string;
        permissions: string[];
        parentId?: string;
      }>;
      resources: Array<{
        id: string;
        type: string;
        parentId?: string;
        requiredPermission: string;
      }>;
    },
    traceInfo: {
      tenantId: string;
      shopId: string;
      taskId: string;
      traceId: string;
      businessType: 'TOC' | 'TOB';
    }
  ): Promise<{
    timestamp: string;
    boundaryTests: number;
    boundaryViolations: number;
    results: Array<{
      userId: string;
      role: string;
      resourceId: string;
      resourceType: string;
      requiredPermission: string;
      hasPermission: boolean;
      parentHierarchyMatch: boolean;
      boundaryViolated: boolean;
    }>;
  }> {
    try {
      const timestamp = new Date().toISOString();
      const results = [];
      let boundaryTests = 0;
      let boundaryViolations = 0;
      
      for (const user of params.users) {
        for (const resource of params.resources) {
          boundaryTests++;
          
          // 检查用户是否有必要的权限
          const hasPermission = user.permissions.includes(resource.requiredPermission) || user.role === 'ADMIN';
          
          // 检查父级层次结构匹配（数据隔离）
          let parentHierarchyMatch = true;
          if (user.parentId && resource.parentId) {
            parentHierarchyMatch = user.parentId === resource.parentId;
          }
          
          // 检查权限边界是否被违反
          const boundaryViolated = hasPermission && !parentHierarchyMatch && user.role !== 'ADMIN';
          
          if (boundaryViolated) {
            boundaryViolations++;
          }
          
          results.push({
            userId: user.id,
            role: user.role,
            resourceId: resource.id,
            resourceType: resource.type,
            requiredPermission: resource.requiredPermission,
            hasPermission,
            parentHierarchyMatch,
            boundaryViolated,
          });
        }
      }
      
      return {
        timestamp,
        boundaryTests,
        boundaryViolations,
        results,
      };
    } catch (error) {
      console.error('Error testing permission boundaries:', error);
      throw new Error('Failed to test permission boundaries');
    }
  }

  /**
   * 生成权限测试报告
   * @param params 报告参数
   * @param traceInfo 追踪信息
   * @returns 权限测试报告
   */
  public static async generatePermissionReport(
    params: {
      testResults: {
        permissionsTest?: any;
        rolePermissionsTest?: any;
        permissionBoundariesTest?: any;
      };
    },
    traceInfo: {
      tenantId: string;
      shopId: string;
      taskId: string;
      traceId: string;
      businessType: 'TOC' | 'TOB';
    }
  ): Promise<{
    reportId: string;
    timestamp: string;
    summary: {
      totalTests: number;
      passedTests: number;
      failedTests: number;
      permissionScore: number;
    };
    findings: Array<{
      category: string;
      issues: Array<{
        type: string;
        severity: 'high' | 'medium' | 'low';
        description: string;
        recommendation: string;
      }>;
    }>;
    recommendations: string[];
  }> {
    try {
      const reportId = `PERMISSION-REPORT-${Date.now()}`;
      const timestamp = new Date().toISOString();
      const findings = [];
      let totalTests = 0;
      let failedTests = 0;
      
      // 处理权限测试结果
      if (params.testResults.permissionsTest) {
        totalTests += params.testResults.permissionsTest.totalTests;
        failedTests += params.testResults.permissionsTest.failedTests;
        findings.push({
          category: 'Permission Tests',
          issues: params.testResults.permissionsTest.results
            .filter((result: any) => !result.passed)
            .map((result: any) => ({
              type: 'permission_error',
              severity: 'high' as 'high',
              description: `User ${result.userId} (${result.role}) failed permission test for ${result.resourceType} ${result.resourceId}`,
              recommendation: 'Ensure proper permission assignment',
            })),
        });
      }
      
      // 处理角色权限测试结果
      if (params.testResults.rolePermissionsTest) {
        totalTests += params.testResults.rolePermissionsTest.permissionsTested;
        failedTests += params.testResults.rolePermissionsTest.missingPermissions;
        findings.push({
          category: 'Role Permissions',
          issues: params.testResults.rolePermissionsTest.results
            .flatMap((roleResult: any) => 
              roleResult.permissions
                .filter((perm: any) => perm.status === 'missing')
                .map((perm: any) => ({
                  type: 'missing_permission',
                  severity: 'medium' as 'medium',
                  description: `Role ${roleResult.role} missing permission ${perm.permission} for ${perm.resource} ${perm.action}`,
                  recommendation: 'Add missing permissions to role',
                }))
            ),
        });
      }
      
      // 处理权限边界测试结果
      if (params.testResults.permissionBoundariesTest) {
        totalTests += params.testResults.permissionBoundariesTest.boundaryTests;
        failedTests += params.testResults.permissionBoundariesTest.boundaryViolations;
        findings.push({
          category: 'Permission Boundaries',
          issues: params.testResults.permissionBoundariesTest.results
            .filter((result: any) => result.boundaryViolated)
            .map((result: any) => ({
              type: 'boundary_violation',
              severity: 'high' as 'high',
              description: `User ${result.userId} (${result.role}) violated permission boundary for ${result.resourceType} ${result.resourceId}`,
              recommendation: 'Enforce data isolation based on parent hierarchy',
            })),
        });
      }
      
      const passedTests = totalTests - failedTests;
      const permissionScore = totalTests > 0 ? Math.round((passedTests / totalTests) * 100) : 0;
      
      // 生成权限管理建议
      const recommendations = [
        'Implement role-based access control (RBAC)',
        'Define clear permission hierarchies',
        'Regularly review and update permissions',
        'Implement least privilege principle',
        'Add permission audit logging',
        'Test permissions regularly',
        'Enforce data isolation based on parent hierarchy',
        'Implement permission boundary checks',
      ];
      
      return {
        reportId,
        timestamp,
        summary: {
          totalTests,
          passedTests,
          failedTests,
          permissionScore,
        },
        findings,
        recommendations,
      };
    } catch (error) {
      console.error('Error generating permission report:', error);
      throw new Error('Failed to generate permission report');
    }
  }

  /**
   * 测试权限中间件
   * @param params 测试参数
   * @param traceInfo 追踪信息
   * @returns 权限中间件测试结果
   */
  public static async testPermissionMiddleware(
    params: {
      endpoints: Array<{
        url: string;
        method: 'GET' | 'POST' | 'PUT' | 'DELETE';
        requiredPermission: string;
      }>;
      users: Array<{
        id: string;
        role: string;
        permissions: string[];
      }>;
    },
    traceInfo: {
      tenantId: string;
      shopId: string;
      taskId: string;
      traceId: string;
      businessType: 'TOC' | 'TOB';
    }
  ): Promise<{
    timestamp: string;
    middlewareTests: number;
    passedTests: number;
    failedTests: number;
    results: Array<{
      endpoint: string;
      method: string;
      requiredPermission: string;
      userId: string;
      role: string;
      hasPermission: boolean;
      expected: boolean;
      passed: boolean;
    }>;
  }> {
    try {
      const timestamp = new Date().toISOString();
      const results = [];
      let middlewareTests = 0;
      let passedTests = 0;
      let failedTests = 0;
      
      for (const endpoint of params.endpoints) {
        for (const user of params.users) {
          middlewareTests++;
          
          // 检查用户是否有必要的权限
          const hasPermission = user.permissions.includes(endpoint.requiredPermission) || user.role === 'ADMIN';
          
          // 预期结果
          const expected = user.permissions.includes(endpoint.requiredPermission) || user.role === 'ADMIN';
          
          // 验证测试结果
          const passed = hasPermission === expected;
          
          if (passed) {
            passedTests++;
          } else {
            failedTests++;
          }
          
          results.push({
            endpoint: endpoint.url,
            method: endpoint.method,
            requiredPermission: endpoint.requiredPermission,
            userId: user.id,
            role: user.role,
            hasPermission,
            expected,
            passed,
          });
        }
      }
      
      return {
        timestamp,
        middlewareTests,
        passedTests,
        failedTests,
        results,
      };
    } catch (error) {
      console.error('Error testing permission middleware:', error);
      throw new Error('Failed to test permission middleware');
    }
  }
}
