using Distribution.Infra.UoW;
using Distribution.Models;

namespace Distribution.Features.BankAccount;

public class BankAccountService(IBankAccountRepository repo, IUnitOfWork uow)
{
    private const string DefaultCurrency = "LKR";

    private static BankAccountResponse ToResponse(Models.BankAccount a) =>
        new(
            a.AccountType,
            a.Id,
            a.AccountName,
            a.AccountType == BankAccountType.Bank ? a.BankName : null,
            a.AccountType == BankAccountType.Cash ? a.CashAccountTypeName : null,
            a.AccountNumber,
            a.CurrencyCode,
            a.CreatedAt,
            a.AccountType == BankAccountType.Cash ? a.IsActive : null,
            a.AccountType == BankAccountType.Cash ? a.IsDefault : null);

    public async Task<List<BankAccountResponse>> ListAsync(BankAccountType? accountType) =>
        (await repo.ListAsync(accountType)).Select(ToResponse).ToList();

    public async Task<List<CashAccountTypeDto>> ListCashAccountTypesAsync() =>
        (await repo.ListCashAccountTypeNamesAsync()).Select(n => new CashAccountTypeDto(n)).ToList();

    public async Task<BankAccountResponse> CreateBankAsync(CreateBankAccountRequest request, CancellationToken ct = default)
    {
        if (string.IsNullOrWhiteSpace(request.AccountName))
            throw new InvalidOperationException("AccountName is required");
        if (await repo.ExistsByNameAsync(BankAccountType.Bank, request.AccountName))
            throw new InvalidOperationException("A bank account with this name already exists");

        var account = new Models.BankAccount
        {
            AccountType = BankAccountType.Bank,
            AccountName = request.AccountName,
            BankName = request.BankName,
            AccountNumber = request.AccountNumber,
            CurrencyCode = string.IsNullOrWhiteSpace(request.CurrencyCode) ? DefaultCurrency : request.CurrencyCode!,
            IsActive = true,
            IsDefault = false
        };

        await repo.AddAsync(account);
        await uow.CommitAsync(ct);
        return ToResponse(account);
    }

    public async Task<BankAccountResponse> CreateCashAsync(CreateCashAccountRequest request, CancellationToken ct = default)
    {
        if (string.IsNullOrWhiteSpace(request.AccountName))
            throw new InvalidOperationException("AccountName is required");
        if (string.IsNullOrWhiteSpace(request.CashAccountTypeName))
            throw new InvalidOperationException("CashAccountTypeName is required");
        if (await repo.ExistsByNameAsync(BankAccountType.Cash, request.AccountName))
            throw new InvalidOperationException("A cash account with this name already exists");

        var account = new Models.BankAccount
        {
            AccountType = BankAccountType.Cash,
            AccountName = request.AccountName,
            CashAccountTypeName = request.CashAccountTypeName,
            AccountNumber = request.AccountNumber,
            CurrencyCode = string.IsNullOrWhiteSpace(request.CurrencyCode) ? DefaultCurrency : request.CurrencyCode!,
            IsActive = true,
            IsDefault = false
        };

        await repo.AddAsync(account);
        await uow.CommitAsync(ct);
        return ToResponse(account);
    }

    public async Task<BankAccountResponse?> UpdateCashAsync(Guid id, UpdateCashAccountRequest request, CancellationToken ct = default)
    {
        var account = await repo.GetByIdAsync(id);
        if (account is null || account.AccountType != BankAccountType.Cash) return null;
        if (string.IsNullOrWhiteSpace(request.AccountName))
            throw new InvalidOperationException("AccountName is required");
        if (await repo.ExistsByNameAsync(BankAccountType.Cash, request.AccountName, excludeId: id))
            throw new InvalidOperationException("A cash account with this name already exists");

        account.AccountName = request.AccountName;
        repo.Update(account);
        await uow.CommitAsync(ct);
        return ToResponse(account);
    }

    public async Task<BankAccountResponse?> SetCashStatusAsync(Guid id, SetCashAccountStatusRequest request, CancellationToken ct = default)
    {
        var account = await repo.GetByIdAsync(id);
        if (account is null || account.AccountType != BankAccountType.Cash) return null;
        if (account.IsDefault && !request.IsActive)
            throw new InvalidOperationException("The default cash account cannot be deactivated");

        account.IsActive = request.IsActive;
        repo.Update(account);
        await uow.CommitAsync(ct);
        return ToResponse(account);
    }

    public async Task<bool> DeleteCashAsync(Guid id, CancellationToken ct = default)
    {
        var account = await repo.GetByIdAsync(id);
        if (account is null || account.AccountType != BankAccountType.Cash) return false;
        if (account.IsDefault)
            throw new InvalidOperationException("The default cash account cannot be deleted");

        repo.Remove(account);
        await uow.CommitAsync(ct);
        return true;
    }
}