namespace TaxBaik.Application.Services;

using TaxBaik.Domain.Entities;
using TaxBaik.Domain.Interfaces;

public class ContractService(IContractRepository repository)
{
    public async Task<int> CreateAsync(int clientId, string contractNumber, string serviceType,
        DateTime startDate, decimal? monthlyFee = null, decimal? totalAmount = null, CancellationToken ct = default)
    {
        if (clientId <= 0)
            throw new ValidationException("유효한 고객을 선택하세요.");
        if (string.IsNullOrWhiteSpace(contractNumber))
            throw new ValidationException("계약 번호를 입력하세요.");
        if (string.IsNullOrWhiteSpace(serviceType))
            throw new ValidationException("서비스 유형을 입력하세요.");

        var contract = new Contract
        {
            ClientId = clientId,
            ContractNumber = contractNumber.Trim(),
            ServiceType = serviceType.Trim(),
            ContractDate = DateTime.Today,
            StartDate = startDate,
            MonthlyFee = monthlyFee,
            TotalAmount = totalAmount,
            Status = "active",
            PaymentStatus = "pending",
            CreatedAt = DateTime.UtcNow,
            UpdatedAt = DateTime.UtcNow
        };

        return await repository.CreateAsync(contract, ct);
    }

    public async Task<Contract?> GetByIdAsync(int id, CancellationToken ct = default) =>
        await repository.GetByIdAsync(id, ct);

    public async Task<IEnumerable<Contract>> GetByClientIdAsync(int clientId, CancellationToken ct = default) =>
        await repository.GetByClientIdAsync(clientId, ct);

    public async Task<IEnumerable<Contract>> GetActiveContractsAsync(CancellationToken ct = default) =>
        await repository.GetActiveContractsAsync(ct);

    public async Task<IEnumerable<Contract>> GetExpiringContractsAsync(int daysAhead = 30, CancellationToken ct = default) =>
        await repository.GetExpiringContractsAsync(daysAhead, ct);

    public async Task<decimal> GetMonthlyRecurringRevenueAsync(CancellationToken ct = default) =>
        await repository.GetMonthlyRecurringRevenueAsync(ct);
}