using System;
using System.ComponentModel.DataAnnotations;

namespace YourProject.Models
{
    public class TimeEntry
    {
        [Key]
        public string EntryId { get; set; } = string.Empty;

        [Required]
        public string ProjectId { get; set; } = string.Empty;

        [Required]
        public string ClientId { get; set; } = string.Empty;

        [Required]
        public DateOnly WorkDate { get; set; }

        public TimeOnly? StartTime { get; set; }

        public TimeOnly? EndTime { get; set; }

        [Required]
        [Range(0.01, double.MaxValue)]
        public decimal Hours { get; set; }

        [MaxLength(1000)]
        public string? Description { get; set; }

        [Range(0, double.MaxValue)]
        public decimal? Rate { get; set; }

        // Computed column (mirrors the GENERATED ALWAYS AS clause)
        public decimal Amount => (Rate ?? 0) * Hours;

        public bool Billed { get; set; } = false;

        public DateOnly? BilledDate { get; set; }

        public DateTime CreatedAt { get; set; } = DateTime.UtcNow;

        public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;

        // Optional navigation properties (great for EF Core)
        public Project? Project { get; set; }
        public Client? Client { get; set; }

        // Helper method
        public void UpdateTimestamp()
        {
            UpdatedAt = DateTime.UtcNow;
        }
    }
}