using Microsoft.EntityFrameworkCore;
using TaskLedger.Api.Domain.Entities;
using TaskLedger.Api.Infrastructure.Data;

namespace TaskLedger.Api.Services;

/// <summary>
/// Service implementation for task operations.
/// </summary>
public class TaskService : ITaskService
{
    private readonly AppDbContext _context;

    /// <summary>
    /// Initializes a new instance of the <see cref="TaskService"/> class.
    /// </summary>
    /// <param name="context">The database context.</param>
    public TaskService(AppDbContext context)
    {
        _context = context;
    }

    /// <inheritdoc />
    public async Task<Domain.Entities.Task> CreateTaskAsync(string title, string? description)
    {
        // Business rule: Title is required
        if (string.IsNullOrWhiteSpace(title))
        {
            throw new ArgumentException("Title is required.", nameof(title));
        }

        // Create new task entity
        var task = new Domain.Entities.Task
        {
            Title = title.Trim(),
            Description = description?.Trim(),
            IsCompleted = false,
            CreatedUtc = DateTime.UtcNow // Business rule: CreatedUtc is set server-side
        };

        // Add to context and save
        _context.Tasks.Add(task);
        await _context.SaveChangesAsync();

        return task;
    }

    /// <inheritdoc />
    public async Task<IEnumerable<Domain.Entities.Task>> GetAllTasksAsync()
    {
        return await _context.Tasks
            .OrderBy(t => t.CreatedUtc)
            .ToListAsync();
    }
}