Inventario-IT/backend/Controllers/DashboardController.cs

using Dapper;
using Inventario.API.Data;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Authorization;

namespace Inventario.API.Controllers
{
    [Authorize]
    [ApiController]
    [Route("api/[controller]")]
    public class DashboardController : ControllerBase
    {
        private readonly DapperContext _context;

        public DashboardController(DapperContext context)
        {
            _context = context;
        }

        public class StatItemDto
        {
            // Cambiamos el tipo de Label a string para que Dapper no tenga problemas
            // al leer el ram_installed (que es un int). Lo formatearemos en el frontend.
            public string Label { get; set; } = "";
            public int Count { get; set; }
        }

        public class DashboardStatsDto
        {
            public IEnumerable<StatItemDto> OsStats { get; set; } = new List<StatItemDto>();
            public IEnumerable<StatItemDto> SectorStats { get; set; } = new List<StatItemDto>();
            public IEnumerable<StatItemDto> CpuStats { get; set; } = new List<StatItemDto>();
            public IEnumerable<StatItemDto> RamStats { get; set; } = new List<StatItemDto>(); // <-- 1. Añadir propiedad para RAM
        }

        [HttpGet("stats")]
        public async Task<IActionResult> GetDashboardStats()
        {
            var osQuery = @"
                SELECT Os AS Label, COUNT(Id) AS Count
                FROM dbo.equipos
                WHERE Os IS NOT NULL AND Os != ''
                GROUP BY Os
                ORDER BY Count DESC;";
            
            var sectorQuery = @"
                SELECT s.Nombre AS Label, COUNT(e.Id) AS Count
                FROM dbo.equipos e
                JOIN dbo.sectores s ON e.sector_id = s.id
                GROUP BY s.Nombre
                ORDER BY Count DESC;";
            
            var cpuQuery = @"
                SELECT Cpu AS Label, COUNT(Id) AS Count
                FROM dbo.equipos
                WHERE Cpu IS NOT NULL AND Cpu != ''
                GROUP BY Cpu
                ORDER BY Count DESC;";

            var ramQuery = @"
                SELECT CAST(ram_installed AS VARCHAR) AS Label, COUNT(Id) AS Count
                FROM dbo.equipos
                WHERE ram_installed > 0
                GROUP BY ram_installed
                ORDER BY ram_installed ASC;";

            using (var connection = _context.CreateConnection())
            {
                var osStats = await connection.QueryAsync<StatItemDto>(osQuery);
                var sectorStats = await connection.QueryAsync<StatItemDto>(sectorQuery);
                var cpuStats = await connection.QueryAsync<StatItemDto>(cpuQuery);
                var ramStats = await connection.QueryAsync<StatItemDto>(ramQuery);

                var result = new DashboardStatsDto
                {
                    OsStats = osStats,
                    SectorStats = sectorStats,
                    CpuStats = cpuStats,
                    RamStats = ramStats
                };

                return Ok(result);
            }
        }
    }
}