#nullable enable
using System;
using System.Collections.Generic;

namespace ShrinkContext
{
    public enum ShrinkFiberDiagnosticStatus
    {
        Inactive = 0,
        Waiting = 1,
        Loading = 2,
        Active = 3,
        Unloading = 4,
        Failed = 5,
        Retired = 6,
    }

    /// <summary>单个依赖键在快照时刻的解析、提交与潜在提供者。</summary>
    public sealed class ShrinkDependencyDiagnostic
    {
        public ShrinkDependencyDiagnostic(string key, string realm, long? currentProviderUid,
            long? committedProviderUid, IReadOnlyList<long> potentialProviderUids)
        {
            Key = key;
            Realm = realm;
            CurrentProviderUid = currentProviderUid;
            CommittedProviderUid = committedProviderUid;
            PotentialProviderUids = potentialProviderUids;
        }

        public string Key { get; }
        public string Realm { get; }
        public long? CurrentProviderUid { get; }
        public long? CommittedProviderUid { get; }
        public IReadOnlyList<long> PotentialProviderUids { get; }
        public bool IsSatisfied => CurrentProviderUid.HasValue;
    }

    /// <summary>一个 fiber 的稳定只读诊断投影，不暴露可变运行时对象。</summary>
    public sealed class ShrinkFiberDiagnostic
    {
        public ShrinkFiberDiagnostic(long uid, string name, ShrinkFiberDiagnosticStatus status,
            ShrinkFiberState lifecycleState, bool retired, bool inTransition,
            IReadOnlyList<string> inject, IReadOnlyList<string> provide,
            IReadOnlyList<long> targetProviderUids,
            IReadOnlyList<ShrinkDependencyDiagnostic> dependencies,
            IReadOnlyList<string> interceptKeys,
            string? errorType, string? errorMessage)
        {
            Uid = uid;
            Name = name;
            Status = status;
            LifecycleState = lifecycleState;
            Retired = retired;
            InTransition = inTransition;
            Inject = inject;
            Provide = provide;
            TargetProviderUids = targetProviderUids;
            Dependencies = dependencies;
            InterceptKeys = interceptKeys;
            ErrorType = errorType;
            ErrorMessage = errorMessage;
        }

        public long Uid { get; }
        public string Name { get; }
        public ShrinkFiberDiagnosticStatus Status { get; }
        public ShrinkFiberState LifecycleState { get; }
        public bool Retired { get; }
        public bool InTransition { get; }
        public IReadOnlyList<string> Inject { get; }
        public IReadOnlyList<string> Provide { get; }
        public IReadOnlyList<long> TargetProviderUids { get; }
        public IReadOnlyList<ShrinkDependencyDiagnostic> Dependencies { get; }
        public IReadOnlyList<string> InterceptKeys { get; }
        public string? ErrorType { get; }
        public string? ErrorMessage { get; }
    }

    public sealed class ShrinkNotificationDiagnostic
    {
        public ShrinkNotificationDiagnostic(long dispatchCount, long candidateVisitCount,
            int lastCandidateCount, int indexedKeyCount)
        {
            DispatchCount = dispatchCount;
            CandidateVisitCount = candidateVisitCount;
            LastCandidateCount = lastCandidateCount;
            IndexedKeyCount = indexedKeyCount;
        }

        public long DispatchCount { get; }
        public long CandidateVisitCount { get; }
        public int LastCandidateCount { get; }
        public int IndexedKeyCount { get; }
    }

    /// <summary>运行时整体快照：fiber、绑定与 notify 索引状态。</summary>
    public sealed class ShrinkContextRuntimeDiagnostic
    {
        public ShrinkContextRuntimeDiagnostic(IReadOnlyList<ShrinkFiberDiagnostic> fibers,
            int bindingCount, ShrinkNotificationDiagnostic notifications)
        {
            Fibers = fibers;
            BindingCount = bindingCount;
            Notifications = notifications;
        }

        public IReadOnlyList<ShrinkFiberDiagnostic> Fibers { get; }
        public int BindingCount { get; }
        public ShrinkNotificationDiagnostic Notifications { get; }
    }
}