using Fleet.Core;
using Monitor.Protocol;

namespace Monitor.Backend.Application;

/// <summary>原始块的索引信息（块本身在段文件里）。</summary>
public sealed record RawChunkMeta(
    ChunkId ChunkId,
    NodeId AgentId,
    string Series,
    string Kind,
    TaskId? TaskId,
    TestId? TestId,
    int? Phase,
    long StartTs,
    int DurationMs,
    bool Partial,
    string SegmentPath,
    long Offset,
    int Length);

/// <summary>写入一个原始块：块的完整字节加上用于索引的元数据。</summary>
public sealed record RawChunkAppend(RawChunkMeta Meta, ReadOnlyMemory<byte> Bytes, string Day);

public sealed record RawQuery(
    NodeId? AgentId = null,
    string? Series = null,
    string? Kind = null,
    TestId? TestId = null,
    long? FromMs = null,
    long? ToMs = null,
    long? AfterStartTs = null,
    int Limit = 500);

public sealed record MetricRow(NodeId AgentId, string Series, long WindowStart, bool Partial, byte[] Metrics);

/// <summary><paramref name="Seq"/> 每次入队递增：处理完成时只删除序号没变的项，处理期间又有迟到的块时不会丢更新。</summary>
public sealed record QueueItem(NodeId AgentId, string Series, long WindowStart, long NotBefore, string Reason, long Seq = 0);

public sealed record MetricVersionRecord(string MetricId, string Fingerprint, long? RecomputeFrom, long? RecomputeCursor);

/// <summary>指标窗口的层级。数值是窗口宽度（秒）。</summary>
public enum MetricLevel
{
    S10 = 10,
    M1 = 60,
    M5 = 300,
    H1 = 3600,
}

public static class MetricLevels
{
    public static readonly IReadOnlyList<MetricLevel> All = [MetricLevel.S10, MetricLevel.M1, MetricLevel.M5, MetricLevel.H1];

    public static long WidthMs(this MetricLevel level) => (long)level * 1000;

    public static string TableName(this MetricLevel level) => level switch
    {
        MetricLevel.S10 => "metric_10s",
        MetricLevel.M1 => "metric_1m",
        MetricLevel.M5 => "metric_5m",
        _ => "metric_1h",
    };
}