using RackPeek.Domain.Resources.Hardware;
using RackPeek.Domain.Resources.Services;
using RackPeek.Domain.Resources.SystemResources;

namespace RackPeek.Domain.Persistence;

public class YamlHardwareRepository(IResourceCollection resources) : IHardwareRepository {
    public Task<int> GetCountAsync() => Task.FromResult(resources.HardwareResources.Count);

    public Task<Dictionary<string, int>> GetKindCountAsync() {
        return Task.FromResult(resources.HardwareResources
            .GroupBy(h => h.Kind)
            .ToDictionary(k => k.Key, v => v.Count()));
    }

    public Task<List<HardwareTree>> GetTreeAsync() {
        var hardwareTree = new List<HardwareTree>();

        var systemGroups = resources.SystemResources
            .Where(s => s.RunsOn.Count != 0)
            .SelectMany(
                s => s.RunsOn,
                (system, hardwareName) => new {
                    Hardware = hardwareName.Trim(),
                    System = system
                })
            .GroupBy(x => x.Hardware, StringComparer.OrdinalIgnoreCase)
            .ToDictionary(
                g => g.Key,
                g => g.Select(x => x.System).ToList(),
                StringComparer.OrdinalIgnoreCase);

        var serviceGroups = resources.ServiceResources
            .Where(s => s.RunsOn.Count != 0)
            .SelectMany(
                s => s.RunsOn,
                (service, systemName) => new {
                    System = systemName.Trim(),
                    Service = service
                })
            .GroupBy(x => x.System, StringComparer.OrdinalIgnoreCase)
            .ToDictionary(
                g => g.Key,
                g => g.Select(x => x.Service).ToList(),
                StringComparer.OrdinalIgnoreCase);

        foreach (Hardware hardware in resources.HardwareResources) {
            var systems = new List<SystemTree>();
            var hardwareKey = hardware.Name.Trim();

            if (systemGroups.TryGetValue(hardwareKey, out List<SystemResource>? systemResources))
                foreach (SystemResource system in systemResources) {
                    var services = new List<string>();
                    var systemKey = system.Name.Trim();

                    if (serviceGroups.TryGetValue(systemKey, out List<Service>? serviceResources))
                        services.AddRange(serviceResources.Select(s => s.Name));

                    systems.Add(new SystemTree {
                        SystemName = system.Name,
                        Services = services
                    });
                }

            hardwareTree.Add(new HardwareTree {
                Kind = hardware.Kind,
                HardwareName = hardware.Name,
                Systems = systems
            });
        }

        return Task.FromResult(hardwareTree);
    }
}