using SQLInsight.Core.Data;
using SQLInsight.Core.Instances;
using SQLInsight.Rules.Engine;

namespace SQLInsight.Rules.Tests;

internal static class TestInstances
{
    public static readonly DateTimeOffset Now = new(2026, 9, 29, 12, 0, 0, TimeSpan.Zero);

    public static RuleContext Context(string version, DateTimeOffset? now = null, EngineEdition edition = EngineEdition.Standard)
    {
        var info = new InstanceInfo
        {
            ServerName = "test",
            Version = SqlServerVersion.Parse(version),
            ProductLevel = "RTM",
            Edition = "Standard Edition",
            EngineEdition = edition,
        };
        return new RuleContext(info, InstanceCapabilities.From(info), now ?? Now);
    }

    /// <summary>SQL Server 2022 with the given data collected.</summary>
    public static RuleContext With(params object[] data) => WithVersion("16.0.4135.4", data);

    public static RuleContext WithVersion(string version, params object[] data)
    {
        var context = Context(version);
        foreach (var item in data)
        {
            context.Data.Set(item.GetType(), item);
        }

        return context;
    }

    public static ConfigurationSnapshot Config(params (string Name, long Value)[] options) => new()
    {
        CapturedAt = Now,
        Options = options.Select(o => new ConfigurationOption(o.Name, o.Value, o.Value)).ToList(),
    };

    public static ServerSnapshot Server(int cpus = 8, long memoryMb = 65536, int numa = 1) => new()
    {
        CapturedAt = Now,
        SqlServerStartTime = Now.UtcDateTime.AddDays(-10),
        LogicalCpuCount = cpus,
        VisibleOnlineSchedulers = cpus,
        NumaNodeCount = numa,
        PhysicalMemoryMb = memoryMb,
    };

    public static DatabaseInfo Database(string name = "Sales", Func<DatabaseInfo, DatabaseInfo>? change = null)
    {
        var db = new DatabaseInfo
        {
            Name = name,
            DatabaseId = 5,
            State = "ONLINE",
            RecoveryModel = "FULL",
            CompatibilityLevel = 160,
            PageVerify = "CHECKSUM",
            CreateDate = Now.UtcDateTime.AddYears(-1),
            LastFullBackup = Now.UtcDateTime.AddDays(-1),
            LastLogBackup = Now.UtcDateTime.AddMinutes(-15),
            LastGoodCheckDb = Now.UtcDateTime.AddDays(-2),
            VirtualLogFileCount = 50,
        };
        return change is null ? db : change(db);
    }

    public static DatabaseSnapshot DatabaseList(params DatabaseInfo[] databases) => new() { CapturedAt = Now, Databases = databases };

    public static CumulativeSample<WaitStatsSnapshot, WaitStatsDelta> Waits(TimeSpan interval, params WaitStat[] waits)
    {
        var snapshot = new WaitStatsSnapshot { CapturedAt = Now, SqlServerStartTime = Now.UtcDateTime.AddDays(-1), Waits = waits };
        return new(snapshot, new WaitStatsDelta { From = Now - interval, To = Now, Waits = waits });
    }

    public static CumulativeSample<FileIoSnapshot, FileIoDelta> Io(params FileIoStat[] files)
    {
        var snapshot = new FileIoSnapshot { CapturedAt = Now, SqlServerStartTime = Now.UtcDateTime.AddDays(-1), Files = files };
        return new(snapshot, new FileIoDelta { From = Now.AddMinutes(-5), To = Now, Files = files });
    }

    public static FileIoStat File(string type, long reads = 0, long readStallMs = 0, long writes = 0, long writeStallMs = 0) => new()
    {
        DatabaseName = "Sales",
        FileId = type == "LOG" ? 2 : 1,
        FileType = type,
        PhysicalName = type == "LOG" ? "L:\\Sales_log.ldf" : "D:\\Sales.mdf",
        Reads = reads,
        BytesRead = reads * 8192,
        ReadStallMs = readStallMs,
        Writes = writes,
        BytesWritten = writes * 8192,
        WriteStallMs = writeStallMs,
    };
}