using System.Text.Json.Serialization;

namespace LibSystemdCli.Models;

public class SystemdServiceData {
    [JsonPropertyName("data")]
    public Dictionary<string, string> SingleData { get; set; } = new();

    [JsonPropertyName("multiData")]
    public Dictionary<string, List<string>> MultiData { get; set; } = new();

    public bool IsRunning => Status is "active" or "reloading" or "deactating" or "activating";
    public string Status => GetSingleData("ActiveState") ?? "unknown";
    
    public long MemoryCurrent {
        get {
            if (long.TryParse(GetSingleData("MemoryCurrent") ?? "0", out long mem)) return mem;
            return 0;
        }
    }

    public long MemoryPeak {
        get {
            if (long.TryParse(GetSingleData("MemoryPeak") ?? "0", out long mem)) return mem;
            return 0;
        }
    }
    
    
    public void AddData(string key, string value) {
        if (MultiData.ContainsKey(key)) {
            MultiData[key].Add(value);
        }
        else if (SingleData.ContainsKey(key)) {
            MultiData[key] = [SingleData[key], value];
            SingleData.Remove(key);
        }
        else {
            SingleData[key] = value;
        }
    }

    public List<string>? GetData(string key) {
        if (MultiData.TryGetValue(key, out var data)) {
            return data;
        }

        if (SingleData.TryGetValue(key, out var value)) {
            return new List<string> { value };
        }

        return null;
    }
    
    public string? GetSingleData(string key) {
        if (SingleData.TryGetValue(key, out var value)) {
            return value;
        }

        return null;
    }

    public void SetOldData(SystemdServiceData oldData) {
        var now = DateTime.Now;
        
        var cpuDiff = CpuUsageNs - oldData.CpuUsageNs;
        var timeDiff = now - oldData.Timestamp;
        CpuUsagePercent = cpuDiff / timeDiff.TotalMilliseconds / 1_000_000d;
    }
    
    public DateTime Timestamp { get; set; } = DateTime.Now;
    public long CpuUsageNs => long.Parse(GetSingleData("CPUUsageNSec") ?? "0");
    
    public double CpuUsagePercent { get; set; }
}