# Multi-Tenancy Implementation Status

## Completed Tasks ✅

### Phase 1: Core Infrastructure (COMPLETED)
- ✅ Created `Company` entity with all required fields
- ✅ Added `CompanyId` to `BaseEntity` (all entities now tenant-scoped)
- ✅ Updated `ApplicationUser` with `CompanyId`, `Company` navigation, and `CompanyRole`
- ✅ Created `ITenantContext` interface
- ✅ Implemented `TenantContext` service for tenant resolution
- ✅ Updated `AppConstants` with `SuperAdmin` role and `CompanyRoles` class

### Phase 2: Database Layer (COMPLETED)
- ✅ Added `Companies` DbSet to `ApplicationDbContext`
- ✅ Implemented global query filters for tenant isolation (soft delete + CompanyId filtering)
- ✅ Added foreign key relationships from all entities to Companies
- ✅ Created CompanyId indexes on all tenant-scoped entities
- ✅ Updated `SaveChangesAsync` to auto-set CompanyId on new entities
- ✅ Created EF Core migration `AddMultiTenancy`

### Phase 3: Authentication & Authorization (COMPLETED)
- ✅ Registered `ITenantContext` service in Program.cs
- ✅ Added `HttpContextAccessor` for tenant context resolution
- ✅ Configured authorization policies:
  - `SuperAdminOnly` - Platform administrators
  - `CompanyAdminOnly` - Company administrators
  - `CanManageJobs` - Job management permissions
  - `CanManageUsers` - User management permissions
  - `CanViewData` - All authenticated users

### Phase 4: Data Seeding (COMPLETED)
- ✅ Updated `SeedData.cs` to create default company
- ✅ Seeds SuperAdmin user (superadmin@powdercoating.com / SuperAdmin123!)
- ✅ Seeds CompanyAdmin user (admin@demo.com / CompanyAdmin123!)
- ✅ Seeds Manager user (manager@demo.com / Manager123!)

## Completed Tasks ✅ (Continued)

### Phase 5: Company Management (COMPLETED)
- ✅ Created Company DTOs (CompanyDto, CompanyListDto, CreateCompanyDto, UpdateCompanyDto)
- ✅ Created CompaniesController for SuperAdmin with full CRUD operations
- ✅ Created Company views (Index, Create, Edit, Details)
- ✅ Created CompanyProfile for AutoMapper
- ✅ Enhanced Repository with `include` and `ignoreQueryFilters` support

### Phase 6: User Management (COMPLETED)
- ✅ Created User Management DTOs
- ✅ Created CompanyUsersController for company user management
- ✅ Created CompanyUsers views (Index, Create, Edit)
- ✅ Implemented user creation with automatic company assignment
- ✅ Implemented role-based permissions per user

### Phase 7: UI Updates (COMPLETED)
- ✅ Updated _Layout.cshtml with company badge display in header
- ✅ Added conditional navigation for SuperAdmin (Companies menu)
- ✅ Added conditional navigation for CompanyAdmin (Manage Users menu)
- ✅ Created AUTHORIZATION_UPDATE_GUIDE.md with instructions for existing controllers

### Phase 8: Ready for Deployment
- 📋 Apply database migration (see DEPLOYMENT_GUIDE.md)
- 📋 Test multi-tenancy implementation end-to-end

## Important Notes ⚠️

### Migration Status
The migration file `20260205220415_AddMultiTenancy.cs` has been created but **NOT YET APPLIED** to the database.

**IMPORTANT**: Before applying the migration, you need to handle existing data:

1. The migration adds `CompanyId` columns with `defaultValue: 0`
2. This will cause foreign key constraint violations
3. The `SeedData.cs` will create a default company and assign users to it
4. **First-time setup**: Run migration after ensuring no data exists, or manually update existing data

### Applying the Migration

```bash
cd src/PowderCoating.Web
dotnet ef database update --project ../PowderCoating.Infrastructure
```

### Default Credentials

After migration and seeding:

**Super Admin (Platform Management)**
- Email: superadmin@powdercoating.com
- Password: SuperAdmin123!
- Can: Manage all companies, view all data

**Company Admin (Demo Company)**
- Email: admin@demo.com
- Password: CompanyAdmin123!
- Can: Manage Demo Company users, manage Demo Company data

**Manager (Demo Company)**
- Email: manager@demo.com
- Password: Manager123!
- Can: Manage jobs, inventory, customers for Demo Company

## Architecture Overview

### Data Isolation
- **Global Query Filters**: All queries automatically filtered by `CompanyId`
- **SuperAdmin Bypass**: SuperAdmin can use `.IgnoreQueryFilters()` to access all data
- **Automatic CompanyId Assignment**: `SaveChangesAsync` auto-sets CompanyId on new entities

### Tenant Resolution
1. User logs in and receives `CompanyId` claim
2. `TenantContext` reads `CompanyId` from HTTP context claims
3. `ApplicationDbContext` uses `TenantContext` to apply query filters
4. All queries automatically scoped to user's company

### Role Hierarchy
- **SuperAdmin**: Platform-level (manages companies, sees all data)
- **CompanyAdmin**: Company-level (manages company users and data)
- **Manager**: Company-level (manages operations, no user management)
- **Worker**: Company-level (limited write access)
- **Viewer**: Company-level (read-only access)

## Next Steps

1. **Complete Company Management** (CompaniesController + views)
2. **Complete User Management** (CompanyUsersController + views)
3. **Update Navigation** (_Layout.cshtml)
4. **Apply Migration** (database update)
5. **End-to-End Testing**

## File Changes Summary

### New Files Created
- `src/PowderCoating.Core/Entities/Company.cs`
- `src/PowderCoating.Core/Interfaces/ITenantContext.cs`
- `src/PowderCoating.Infrastructure/Services/TenantContext.cs`
- `src/PowderCoating.Infrastructure/Migrations/20260205220415_AddMultiTenancy.cs`

### Modified Files
- `src/PowderCoating.Core/Entities/BaseEntity.cs` - Added CompanyId
- `src/PowderCoating.Core/Entities/ApplicationUser.cs` - Added CompanyId, Company, CompanyRole
- `src/PowderCoating.Infrastructure/Data/ApplicationDbContext.cs` - Query filters, relationships, auto-set CompanyId
- `src/PowderCoating.Infrastructure/Data/SeedData.cs` - Multi-tenancy seeding
- `src/PowderCoating.Shared/Constants/AppConstants.cs` - SuperAdmin role, CompanyRoles
- `src/PowderCoating.Web/Program.cs` - ITenantContext registration, authorization policies

## Known Issues / Warnings

1. **EF Warning**: "Entity 'Company' has a global query filter defined and is the required end of a relationship"
   - This is expected and doesn't affect functionality
   - Company navigation on ApplicationUser is nullable to handle this

2. **Migration Data Loss Warning**: "An operation was scaffolded that may result in the loss of data"
   - The migration adds non-nullable CompanyId columns
   - Existing data will have CompanyId=0 initially
   - SeedData creates default company and should assign users to it
   - Manual data migration may be needed for existing production data