PaydayBackend/PaydayBackend/Services/AdminService.cs

using Microsoft.EntityFrameworkCore;
using PaydayBackend.Models;

namespace PaydayBackend.Services;

public interface IAdminService
{
    public Task AddBank(Bank bank);
    public Task<IEnumerable<Bank>> GetAllBanks();
    public Task AddLoanTerm(LoanTerm loanTerm);
    public Task<string> RemoveAllLoanTermsByBankId(long bankId);
    public Task<IEnumerable<LoanTerm>?> GetAllLoanTermsByBankId(long bankId);
    public Task AddUniversity(University university);
    public Task AddUniversityDirection(UniversityDirection universityDirection);
}

public class AdminService : IAdminService
{
    private DatabaseContext _databaseContext;

    private async Task<bool> BankIsExist(long bankId)
    {
        if (await _databaseContext.Banks.Where(x => x.Id == bankId).FirstOrDefaultAsync() == null)
            return false;

        return true;
    }

    public AdminService(DatabaseContext databaseContext)
    {
        _databaseContext = databaseContext;
    }
    
    // -------------------------------------| Банки |-------------------------------------

    public async Task AddBank(Bank bank)
    {
        await _databaseContext.Banks.AddAsync(bank);
        await _databaseContext.SaveChangesAsync();
    }

    public async Task<IEnumerable<Bank>> GetAllBanks()
    {
        return await _databaseContext.Banks.ToListAsync();
    }

    public async Task AddLoanTerm(LoanTerm loanTerm)
    {
        await _databaseContext.LoanTerms.AddAsync(loanTerm);
        await _databaseContext.SaveChangesAsync();
    }

    public async Task<string> RemoveAllLoanTermsByBankId(long bankId)
    {
        if (await BankIsExist(bankId))
            return "Bank not found";
        
        var result = await _databaseContext.LoanTerms.Where(x => x.Bank.Id == bankId).ToListAsync();
        _databaseContext.LoanTerms.RemoveRange(result);

        return "OK";
    }

    public async Task<IEnumerable<LoanTerm>?> GetAllLoanTermsByBankId(long bankId)
    {
        if (await BankIsExist(bankId))
            return null;
        
        return await _databaseContext.LoanTerms.Where(x => x.Bank.Id == bankId).ToListAsync();
    }
    
    // -------------------------------------| Университеты |-------------------------------------

    public async Task AddUniversity(University university)
    {
        await _databaseContext.Universities.AddAsync(university);
        await _databaseContext.SaveChangesAsync();
    }

    public async Task AddUniversityDirection(UniversityDirection universityDirection)
    {
        await _databaseContext.UniversityDirections.AddAsync(universityDirection);
        await _databaseContext.SaveChangesAsync();
    }
}