using System.Text.Json.Serialization;

namespace ThingHK;

// ===== 数据契约（与 ThingHK_GUIDE.md 第 2.4 节一致，schemaVersion=1） =====
// 这些类型同时用于：HTTP 响应、SSE 推送、--scan 命令输出。
// 任何字段变更必须递增 SensorSnapshot.SchemaVersion。

/// <summary>
/// 传感器快照：一次全量采样的标准化输出。
/// 同时用于 GET /snapshot 响应、GET /stream SSE 事件、--scan 命令输出。
/// </summary>
internal sealed class SensorSnapshot
{
    /// <summary>数据契约版本， breaking 变更时递增</summary>
    public int SchemaVersion { get; set; } = 1;

    /// <summary>采样时间戳（UTC 毫秒）</summary>
    public long Timestamp { get; set; }

    /// <summary>从 Kernel 启动到首次产生快照的毫秒数（仅首个快照有意义，后续为 0）</summary>
    public double ColdStartMs { get; set; }

    /// <summary>Kernel 是否以管理员权限运行</summary>
    public bool IsAdmin { get; set; }

    /// <summary>当前 Kernel 是否已完成首轮扫描（ready 信号依据）</summary>
    public bool Ready { get; set; }

    /// <summary>本次快照包含的硬件分组</summary>
    public List<SensorGroup> Groups { get; set; } = new();
}

internal sealed class SensorGroup
{
    /// <summary>分组标识（hardware type 小写，如 cpu/gpuintel/storage）</summary>
    public string Id { get; set; } = "";

    /// <summary>分组显示名（如 CPU / GpuIntel）</summary>
    public string Name { get; set; } = "";

    /// <summary>该分组下的传感器列表</summary>
    public List<SensorEntry> Sensors { get; set; } = new();
}

internal sealed class SensorEntry
{
    /// <summary>全局唯一 ID：{groupId}/{hwName}/{sensorType}/{sensorName} 小写化</summary>
    public string Id { get; set; } = "";

    public string Name { get; set; } = "";
    public string Type { get; set; } = "";
    public string HardwareName { get; set; } = "";

    /// <summary>传感器当前值；null 表示首轮未就绪或硬件不可读</summary>
    public float? Value { get; set; }

    public string Unit { get; set; } = "";
}

/// <summary>
/// /status 路由响应：用于冷启动就绪探测（见指南第 3.1 节）。
/// 前端通过轮询此接口判断是否可请求 /snapshot 或订阅 /stream。
/// </summary>
internal sealed class KernelStatus
{
    public bool Ready { get; set; }
    public bool IsAdmin { get; set; }
    /// <summary>PawnIO 驱动是否已安装（ring0 传感器读取依赖它或 WinRing0，缺失时温度/频率通常无法读取）</summary>
    public bool PawnIoInstalled { get; set; }
    public double UptimeMs { get; set; }
    public int GroupCount { get; set; }
    public int SensorCount { get; set; }
    public List<string> Providers { get; set; } = new();
    public int SchemaVersion { get; set; } = 1;
}

/// <summary>
/// /config 请求体：运行时调整采样配置。
/// 字段均可选，仅传递需要变更的字段。
/// </summary>
internal sealed class ConfigRequest
{
    /// <summary>快通道采样间隔（毫秒），0 或负数表示不变</summary>
    public int? FastIntervalMs { get; set; }

    /// <summary>慢通道采样间隔（毫秒），0 或负数表示不变</summary>
    public int? SlowIntervalMs { get; set; }

    /// <summary>SSE 推送间隔（毫秒），仅影响后续 stream 订阅，0 或负数表示不变</summary>
    public int? StreamIntervalMs { get; set; }
}

internal sealed class ConfigResponse
{
    public bool Success { get; set; }
    public int FastIntervalMs { get; set; }
    public int SlowIntervalMs { get; set; }
    public int StreamIntervalMs { get; set; }
}

/// <summary>
/// 根路由健康检查响应。
/// </summary>
internal sealed class HealthResponse
{
    public bool Ok { get; set; } = true;
    public string Name { get; set; } = "ThingHK";
    public string Version { get; set; } = "0.2.0";
}

/// <summary>
/// 错误响应：AOT 下所有 BadRequest/NotFound 必须用强类型，不能用匿名对象。
/// </summary>
internal sealed class ErrorResponse
{
    public ErrorResponse(string error, string message) { Error = error; Message = message; }
    public string Error { get; set; }
    public string Message { get; set; }
}

/// <summary>
/// JSON 源生成上下文：消除 Native AOT 下反射式序列化的 IL3050/IL2026 警告。
/// 所有 HTTP 响应类型必须在此注册，否则 AOT 下序列化会抛异常。
/// </summary>
[JsonSourceGenerationOptions(
    WriteIndented = false,
    DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
    PropertyNamingPolicy = JsonKnownNamingPolicy.CamelCase)]
[JsonSerializable(typeof(SensorSnapshot))]
[JsonSerializable(typeof(KernelStatus))]
[JsonSerializable(typeof(ConfigRequest))]
[JsonSerializable(typeof(ConfigResponse))]
[JsonSerializable(typeof(ConfigRequest[]))]
[JsonSerializable(typeof(HealthResponse))]
[JsonSerializable(typeof(ErrorResponse))]
[JsonSerializable(typeof(HardwareConfig))]
[JsonSerializable(typeof(HardwareConfigResponse))]
[JsonSerializable(typeof(HardwareConfigUpdateResponse))]
[JsonSerializable(typeof(HardwareConfigUpdateRequest))]
internal sealed partial class ThingHKJsonContext : JsonSerializerContext;