using System.Collections.Generic;
using System.IO;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace ThingHK;

/// <summary>
/// 硬件监控配置：控制启用哪些硬件分组 + 过滤哪些传感器类型。
///
/// 设计要点：
/// - 硬件开关影响 Computer.IsXxxEnabled，需重启 Kernel 才生效（LHB 在 Open 时决定枚举范围）
/// - 传感器类型过滤在 BuildSnapshot 时生效，可热更新（无需重启）
/// - 默认配置仅覆盖概览页需要的指标：CPU/GPU/Memory/Storage + temp/load/power/clock/data
/// - 配置文件由 Tauri 通过 --config 参数传递路径，Kernel 负责加载/保存
/// </summary>
internal sealed class HardwareConfig
{
    /// <summary>硬件分组开关，key 为 HardwareConfigKey（cpu/gpu/memory/storage/...）</summary>
    public Dictionary<string, bool> Hardware { get; set; } = new();

    /// <summary>传感器类型开关，key 为 SensorType 小写（temperature/load/power/...）</summary>
    public Dictionary<string, bool> SensorTypes { get; set; } = new();

    /// <summary>默认配置：仅覆盖概览页需要的指标，最小化性能开销</summary>
    public static HardwareConfig Default => new()
    {
        Hardware = new Dictionary<string, bool>
        {
            ["cpu"] = true,
            ["gpu"] = true,
            ["memory"] = true,
            ["storage"] = true,
            ["motherboard"] = false,
            ["controller"] = false,
            ["battery"] = false,
            ["network"] = false,
            ["psu"] = false,
        },
        SensorTypes = new Dictionary<string, bool>
        {
            ["temperature"] = true,
            ["load"] = true,
            ["power"] = true,
            ["clock"] = true,
            ["voltage"] = false,
            ["fan"] = false,
            ["data"] = true,
            ["smalldata"] = false,
            ["throughput"] = false,
            ["level"] = false,
            ["control"] = false,
            ["factor"] = false,
            ["frequency"] = false,
            ["timespan"] = false,
            ["energy"] = false,
            ["noise"] = false,
            ["conductivity"] = false,
            ["humidity"] = false,
            ["flow"] = false,
        },
    };

    /// <summary>从文件加载配置，文件不存在或解析失败时返回默认配置</summary>
    public static HardwareConfig Load(string? path)
    {
        if (string.IsNullOrEmpty(path) || !File.Exists(path))
            return Default;

        try
        {
            var json = File.ReadAllText(path);
            var cfg = JsonSerializer.Deserialize(json, ThingHKJsonContext.Default.HardwareConfig);
            if (cfg == null) return Default;

            // 合并默认值：确保新增的硬件/传感器类型有默认值
            MergeWithDefaults(cfg);
            return cfg;
        }
        catch
        {
            return Default;
        }
    }

    /// <summary>保存配置到文件</summary>
    public void Save(string path)
    {
        var dir = Path.GetDirectoryName(path);
        if (!string.IsNullOrEmpty(dir)) Directory.CreateDirectory(dir);
        var json = JsonSerializer.Serialize(this, ThingHKJsonContext.Default.HardwareConfig);
        File.WriteAllText(path, json);
    }

    /// <summary>检查指定传感器类型是否启用</summary>
    public bool IsSensorTypeEnabled(string sensorTypeLower)
        => SensorTypes.TryGetValue(sensorTypeLower, out var enabled) ? enabled : false;

    /// <summary>检查指定硬件分组是否启用</summary>
    public bool IsHardwareEnabled(string key)
        => Hardware.TryGetValue(key, out var enabled) ? enabled : false;

    /// <summary>合并默认值：确保配置文件缺少的新增项有默认值</summary>
    private static void MergeWithDefaults(HardwareConfig cfg)
    {
        var def = Default;
        foreach (var (k, v) in def.Hardware)
            if (!cfg.Hardware.ContainsKey(k)) cfg.Hardware[k] = v;
        foreach (var (k, v) in def.SensorTypes)
            if (!cfg.SensorTypes.ContainsKey(k)) cfg.SensorTypes[k] = v;
    }
}

/// <summary>
/// /config/hardware GET 响应：返回当前配置 + 可用硬件/传感器类型清单。
/// 前端用此数据渲染配置 Dialog。
/// </summary>
internal sealed class HardwareConfigResponse
{
    public HardwareConfig Config { get; set; } = new();
    public List<HardwareTypeInfo> AvailableHardware { get; set; } = new();
    public List<SensorTypeInfo> AvailableSensorTypes { get; set; } = new();
}

/// <summary>硬件分组元信息</summary>
internal sealed class HardwareTypeInfo
{
    /// <summary>配置 key（cpu/gpu/memory/...）</summary>
    public string Key { get; set; } = "";
    /// <summary>显示名</summary>
    public string Name { get; set; } = "";
    /// <summary>是否已启用</summary>
    public bool Enabled { get; set; }
    /// <summary>是否需要管理员权限才能读取完整数据</summary>
    public bool RequiresAdmin { get; set; }
}

/// <summary>传感器类型元信息</summary>
internal sealed class SensorTypeInfo
{
    /// <summary>配置 key（temperature/load/...）</summary>
    public string Key { get; set; } = "";
    /// <summary>显示名</summary>
    public string Name { get; set; } = "";
    /// <summary>是否已启用</summary>
    public bool Enabled { get; set; }
}

/// <summary>/config/hardware POST 响应</summary>
internal sealed class HardwareConfigUpdateResponse
{
    public bool Success { get; set; }
    /// <summary>硬件开关是否变化（需重启 Kernel 才生效）</summary>
    public bool RestartRequired { get; set; }
    public string? ConfigPath { get; set; }
}

/// <summary>/config/hardware POST 请求体</summary>
internal sealed class HardwareConfigUpdateRequest
{
    /// <summary>硬件开关（可选，仅传需要变更的字段）</summary>
    public Dictionary<string, bool>? Hardware { get; set; }
    /// <summary>传感器类型开关（可选，仅传需要变更的字段）</summary>
    public Dictionary<string, bool>? SensorTypes { get; set; }
}