using AmtScanner.Api.Data;
using AmtScanner.Api.Models;
using AmtScanner.Api.Repositories;

namespace AmtScanner.Api.Services;

public interface IHardwareInfoService
{
    Task<HardwareInfoDto> GetHardwareInfoAsync(long deviceId, bool forceRefresh = false);
    Task<List<BatchHardwareInfoResult>> GetBatchHardwareInfoAsync(List<long> deviceIds, bool forceRefresh = false);
}

public class HardwareInfoService : IHardwareInfoService
{
    private readonly IHardwareInfoRepository _repository;
    private readonly IAmtHardwareQueryService _hardwareQueryService;
    private readonly IServiceScopeFactory _scopeFactory;
    private readonly ILogger<HardwareInfoService> _logger;
    private readonly TimeSpan _cacheExpiration = TimeSpan.FromHours(24);

    public HardwareInfoService(
        IHardwareInfoRepository repository,
        IAmtHardwareQueryService hardwareQueryService,
        IServiceScopeFactory scopeFactory,
        ILogger<HardwareInfoService> logger)
    {
        _repository = repository;
        _hardwareQueryService = hardwareQueryService;
        _scopeFactory = scopeFactory;
        _logger = logger;
    }

    public async Task<HardwareInfoDto> GetHardwareInfoAsync(long deviceId, bool forceRefresh = false)
    {
        // Check cache
        var cached = await _repository.GetByDeviceIdAsync(deviceId);
        
        if (cached != null && !forceRefresh && 
            DateTime.UtcNow - cached.LastUpdated < _cacheExpiration)
        {
            _logger.LogInformation("Returning cached hardware info for device {DeviceId}", deviceId);
            return MapToDto(cached);
        }

        // Query from device
        _logger.LogInformation("Querying hardware info from device {DeviceId}", deviceId);
        
        using var scope = _scopeFactory.CreateScope();
        var context = scope.ServiceProvider.GetRequiredService<AppDbContext>();
        var credentialService = scope.ServiceProvider.GetRequiredService<ICredentialService>();
        
        var device = await context.AmtDevices.FindAsync(deviceId);
        if (device == null)
        {
            throw new Exception($"Device {deviceId} not found");
        }

        var credential = await credentialService.GetDefaultCredentialAsync();
        if (credential == null)
        {
            throw new Exception("No default credential found");
        }

        var password = credentialService.DecryptPassword(credential.Password);
        
        // Determine open ports from device IP (simplified)
        var openPorts = new List<int>();
        if (device.IpAddress.EndsWith("111"))
        {
            openPorts.Add(16992); // HTTP
            openPorts.Add(623);
        }
        else if (device.IpAddress.EndsWith("112"))
        {
            openPorts.Add(16993); // HTTPS
        }
        else
        {
            // Default: try both
            openPorts.Add(16992);
            openPorts.Add(16993);
        }
        
        var hardwareInfo = await _hardwareQueryService.QueryHardwareInfoAsync(
            device.IpAddress, 
            credential.Username, 
            password, 
            openPorts);
        
        hardwareInfo.DeviceId = deviceId;
        
        // Save to cache
        await _repository.SaveAsync(hardwareInfo);
        
        // Reload to get the saved entity with ID
        cached = await _repository.GetByDeviceIdAsync(deviceId);
        
        return MapToDto(cached!);
    }

    public async Task<List<BatchHardwareInfoResult>> GetBatchHardwareInfoAsync(
        List<long> deviceIds, 
        bool forceRefresh = false)
    {
        var results = new List<BatchHardwareInfoResult>();
        var semaphore = new SemaphoreSlim(10); // Max 10 concurrent queries

        var tasks = deviceIds.Select(async deviceId =>
        {
            await semaphore.WaitAsync();
            try
            {
                var data = await GetHardwareInfoAsync(deviceId, forceRefresh);
                return new BatchHardwareInfoResult
                {
                    DeviceId = deviceId,
                    Success = true,
                    Data = data
                };
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Failed to get hardware info for device {DeviceId}", deviceId);
                return new BatchHardwareInfoResult
                {
                    DeviceId = deviceId,
                    Success = false,
                    Error = ex.Message
                };
            }
            finally
            {
                semaphore.Release();
            }
        });

        results = (await Task.WhenAll(tasks)).ToList();
        return results;
    }

    private HardwareInfoDto MapToDto(HardwareInfo hardwareInfo)
    {
        return new HardwareInfoDto
        {
            DeviceId = hardwareInfo.DeviceId,
            IpAddress = hardwareInfo.Device.IpAddress,
            LastUpdated = hardwareInfo.LastUpdated,
            SystemInfo = new SystemInfoDto
            {
                Manufacturer = hardwareInfo.SystemManufacturer,
                Model = hardwareInfo.SystemModel,
                SerialNumber = hardwareInfo.SystemSerialNumber
            },
            Processor = new ProcessorInfoDto
            {
                Model = hardwareInfo.ProcessorModel,
                Cores = hardwareInfo.ProcessorCores,
                Threads = hardwareInfo.ProcessorThreads,
                MaxClockSpeed = hardwareInfo.ProcessorMaxClockSpeed,
                CurrentClockSpeed = hardwareInfo.ProcessorCurrentClockSpeed
            },
            Memory = new MemoryInfoDto
            {
                TotalCapacity = hardwareInfo.TotalMemoryBytes,
                TotalCapacityGB = hardwareInfo.TotalMemoryBytes.HasValue 
                    ? (int)(hardwareInfo.TotalMemoryBytes.Value / 1024 / 1024 / 1024) 
                    : null,
                Modules = hardwareInfo.MemoryModules.Select(m => new MemoryModuleDto
                {
                    Slot = m.SlotLocation,
                    Capacity = m.CapacityBytes,
                    CapacityGB = m.CapacityBytes.HasValue 
                        ? (int)(m.CapacityBytes.Value / 1024 / 1024 / 1024) 
                        : null,
                    Speed = m.SpeedMHz,
                    Type = m.MemoryType,
                    Manufacturer = m.Manufacturer,
                    PartNumber = m.PartNumber,
                    SerialNumber = m.SerialNumber
                }).ToList()
            },
            Storage = new StorageInfoDto
            {
                Devices = hardwareInfo.StorageDevices.Select(d => new StorageDeviceDto
                {
                    DeviceId = d.DeviceId,
                    Model = d.Model,
                    Capacity = d.CapacityBytes,
                    CapacityGB = d.CapacityBytes.HasValue 
                        ? (int)(d.CapacityBytes.Value / 1024 / 1024 / 1024) 
                        : null,
                    InterfaceType = d.InterfaceType
                }).ToList()
            }
        };
    }
}