using RackPeek.Domain.Persistence;
using RackPeek.Domain.Resources.SubResources;

namespace RackPeek.Domain.Resources.Servers;

public record ServerHardwareReport(
    IReadOnlyList<ServerHardwareRow> Servers
);

public record ServerHardwareRow(
    string Name,
    string CpuSummary,
    int TotalCores,
    int TotalThreads,
    double RamGb,
    int TotalStorageGb,
    int SsdStorageGb,
    int HddStorageGb,
    int TotalNicPorts,
    double MaxNicSpeedGb,
    int GpuCount,
    int TotalGpuVramGb,
    string GpuSummary,
    bool Ipmi,
    IReadOnlyList<Port> Ports
) {
    public string NicSummary =>
        string.Join(", ",
            (Ports ?? [])
            .SelectMany(n => {
                var ports = n.Count ?? 1;
                var speed = n.Speed ?? 0;
                return Enumerable.Repeat(speed, ports);
            })
            .GroupBy(speed => speed)
            .OrderByDescending(g => g.Key)
            .Select(g => $"{g.Count()}×{g.Key}G")
            .DefaultIfEmpty("none")
        );
}

public class ServerHardwareReportUseCase(IResourceCollection repository) : IUseCase {
    public async Task<ServerHardwareReport> ExecuteAsync() {
        IReadOnlyList<Server> servers = await repository.GetAllOfTypeAsync<Server>();

        var rows = servers.Select(server => {
            var totalCores = server.Cpus?.Sum(c => c.Cores) ?? 0;
            var totalThreads = server.Cpus?.Sum(c => c.Threads) ?? 0;

            var cpuSummary = server.Cpus == null
                ? "Unknown"
                : string.Join(", ",
                    server.Cpus
                        .GroupBy(c => c.Model)
                        .Select(g => $"{g.Count()}× {g.Key}"));

            var ramGb = server.Ram?.Size ?? 0;

            var totalStorage = server.Drives?.Sum(d => d.Size) ?? 0;
            var ssdStorage = server.Drives?
                .Where(d => d.Type == "ssd")
                .Sum(d => d.Size) ?? 0;
            var hddStorage = server.Drives?
                .Where(d => d.Type == "hdd")
                .Sum(d => d.Size) ?? 0;

            var totalNicPorts = server.Ports?.Sum(n => n.Count) ?? 0;
            var maxNicSpeed = server.Ports?.Max(n => n.Speed) ?? 0;

            var gpuCount = server.Gpus?.Count ?? 0;

            var totalGpuVram = server.Gpus?
                .Sum(g => g.Vram) ?? 0;

            var gpuSummary = server.Gpus == null || server.Gpus.Count == 0
                ? "None"
                : string.Join(", ",
                    server.Gpus
                        .GroupBy(g => g.Model)
                        .Select(g => $"{g.Count()}× {g.Key}"));


            return new ServerHardwareRow(
                server.Name,
                cpuSummary,
                totalCores,
                totalThreads,
                ramGb,
                totalStorage,
                ssdStorage,
                hddStorage,
                totalNicPorts,
                maxNicSpeed,
                gpuCount,
                totalGpuVram,
                gpuSummary,
                server.Ipmi ?? false,
                server.Ports ?? new List<Port>()
            );
        }).ToList();

        return new ServerHardwareReport(rows);
    }
}