// backend/Controllers/AdminController.cs
using Dapper;
using Inventario.API.Data;
using Microsoft.AspNetCore.Mvc;

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

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

    // --- DTOs para los componentes ---
    public class ComponenteValorDto
    {
      public string Valor { get; set; } = "";
      public int Conteo { get; set; }
    }
    public class UnificarComponenteDto
    {
      public required string ValorNuevo { get; set; }
      public required string ValorAntiguo { get; set; }
    }

    public class RamAgrupadaDto
    {
      public string? Fabricante { get; set; }
      public int Tamano { get; set; }
      public int? Velocidad { get; set; }
      public int Conteo { get; set; }
    }

    public class BorrarRamAgrupadaDto
    {
      public string? Fabricante { get; set; }
      public int Tamano { get; set; }
      public int? Velocidad { get; set; }
    }


    [HttpGet("componentes/{tipo}")]
    public async Task<IActionResult> GetComponenteValores(string tipo)
    {
      var allowedTypes = new Dictionary<string, string>
            {
                { "os", "Os" },
                { "cpu", "Cpu" },
                { "motherboard", "Motherboard" },
                { "architecture", "Architecture" }
            };

      if (!allowedTypes.TryGetValue(tipo.ToLower(), out var columnName))
      {
        return BadRequest("Tipo de componente no válido.");
      }

      var query = $@"
                SELECT {columnName} AS Valor, COUNT(*) AS Conteo
                FROM dbo.equipos
                WHERE {columnName} IS NOT NULL AND {columnName} != ''
                GROUP BY {columnName}
                ORDER BY Conteo DESC, Valor ASC;";

      using (var connection = _context.CreateConnection())
      {
        var valores = await connection.QueryAsync<ComponenteValorDto>(query);
        return Ok(valores);
      }
    }

    [HttpPut("componentes/{tipo}/unificar")]
    public async Task<IActionResult> UnificarComponenteValores(string tipo, [FromBody] UnificarComponenteDto dto)
    {
      var allowedTypes = new Dictionary<string, string>
            {
                { "os", "Os" },
                { "cpu", "Cpu" },
                { "motherboard", "Motherboard" },
                { "architecture", "Architecture" }
            };

      if (!allowedTypes.TryGetValue(tipo.ToLower(), out var columnName))
      {
        return BadRequest("Tipo de componente no válido.");
      }

      if (dto.ValorAntiguo == dto.ValorNuevo)
      {
        return BadRequest("El valor antiguo y el nuevo no pueden ser iguales.");
      }

      var query = $@"
                UPDATE dbo.equipos
                SET {columnName} = @ValorNuevo
                WHERE {columnName} = @ValorAntiguo;";

      using (var connection = _context.CreateConnection())
      {
        var filasAfectadas = await connection.ExecuteAsync(query, new { dto.ValorNuevo, dto.ValorAntiguo });
        return Ok(new { message = $"Se unificaron {filasAfectadas} registros.", filasAfectadas });
      }
    }

    // --- Devuelve la RAM agrupada ---
    [HttpGet("componentes/ram")]
    public async Task<IActionResult> GetComponentesRam()
    {
      var query = @"
            SELECT
                mr.Fabricante,
                mr.Tamano,
                mr.Velocidad,
                COUNT(emr.memoria_ram_id) as Conteo
            FROM
                dbo.memorias_ram mr
            LEFT JOIN
                dbo.equipos_memorias_ram emr ON mr.id = emr.memoria_ram_id
            GROUP BY
                mr.Fabricante,
                mr.Tamano,
                mr.Velocidad
            ORDER BY
                Conteo DESC, mr.Fabricante, mr.Tamano;";

      using (var connection = _context.CreateConnection())
      {
        var valores = await connection.QueryAsync<RamAgrupadaDto>(query);
        return Ok(valores);
      }
    }

    // --- Elimina un grupo completo ---
    [HttpDelete("componentes/ram")]
    public async Task<IActionResult> BorrarComponenteRam([FromBody] BorrarRamAgrupadaDto dto)
    {
      using (var connection = _context.CreateConnection())
      {
        // Verificación de seguridad: Asegurarse de que el grupo no esté en uso.
        var usageQuery = @"
                SELECT COUNT(emr.id)
                FROM dbo.memorias_ram mr
                LEFT JOIN dbo.equipos_memorias_ram emr ON mr.id = emr.memoria_ram_id
                WHERE (mr.Fabricante = @Fabricante OR (mr.Fabricante IS NULL AND @Fabricante IS NULL)) 
                  AND mr.Tamano = @Tamano 
                  AND (mr.Velocidad = @Velocidad OR (mr.Velocidad IS NULL AND @Velocidad IS NULL));";

        var usageCount = await connection.ExecuteScalarAsync<int>(usageQuery, dto);

        if (usageCount > 0)
        {
          return Conflict(new { message = $"Este grupo de RAM está en uso por {usageCount} equipo(s) y no puede ser eliminado." });
        }

        // Si no está en uso, proceder con la eliminación de todos los registros maestros que coincidan.
        var deleteQuery = @"
                DELETE FROM dbo.memorias_ram 
                WHERE (Fabricante = @Fabricante OR (Fabricante IS NULL AND @Fabricante IS NULL)) 
                  AND Tamano = @Tamano 
                  AND (Velocidad = @Velocidad OR (Velocidad IS NULL AND @Velocidad IS NULL));";

        await connection.ExecuteAsync(deleteQuery, dto);
        return NoContent();
      }
    }

    [HttpDelete("componentes/{tipo}/{valor}")]
    public async Task<IActionResult> BorrarComponenteTexto(string tipo, string valor)
    {
      var allowedTypes = new Dictionary<string, string>
        {
            { "os", "Os" },
            { "cpu", "Cpu" },
            { "motherboard", "Motherboard" },
            { "architecture", "Architecture" }
        };

      if (!allowedTypes.TryGetValue(tipo.ToLower(), out var columnName))
      {
        return BadRequest("Tipo de componente no válido.");
      }

      using (var connection = _context.CreateConnection())
      {
        var usageQuery = $"SELECT COUNT(*) FROM dbo.equipos WHERE {columnName} = @Valor;";
        var usageCount = await connection.ExecuteScalarAsync<int>(usageQuery, new { Valor = valor });

        if (usageCount > 0)
        {
          return Conflict(new { message = $"Este valor está en uso por {usageCount} equipo(s) y no puede ser eliminado. Intente unificarlo en su lugar." });
        }

        return NoContent();
      }
    }
  }
}