using BuildFlow.Platform.Domain.Entities.User;
using BuildFlow.Platform.Infrastructure.Persistence;
using BuildFlow.Shared.Domain.Common;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Primitives;
using Microsoft.Extensions.DependencyInjection;

namespace BuildFlow.Platform.Tests;

/// <summary>
/// Platform 模块测试基础设施：InMemory PlatformDbContext 工厂 + JWT 配置构造 + 审计字段填充 helper。
/// </summary>
/// <remarks>
/// 不挂 AuditInterceptor（拦截器依赖 ICurrentUserContext，测试上下文里没有）；
/// 约定：测试 seed 实体时调用 <see cref="WithAudit"/> 填充必填审计字段。
/// </remarks>
internal static class PlatformTestDb
{
    /// <summary>构造一个独立的 InMemory PlatformDbContext（每个测试唯一库名，避免串扰）。</summary>
    /// <remarks>
    /// 挂载 SavingChanges 回调自动填充 IAuditable/IHasOperatorIP 字段（替代生产环境的 AuditInterceptor），
    /// 这样 handler 内部 new 出来的 RefreshTokenEntity/UserRoleEntity/RolePermissionEntity 等实体也能通过非空校验。
    /// </remarks>
    public static PlatformDbContext CreateDbContext([System.Runtime.CompilerServices.CallerMemberName] string testName = "")
    {
        var services = new ServiceCollection();
        services.AddDbContext<PlatformDbContext>(o => o.UseInMemoryDatabase($"platform-{testName}-{Guid.NewGuid()}"));
        var db = services.BuildServiceProvider().GetRequiredService<PlatformDbContext>();
        db.SavingChanges += AutoFillAuditFields;
        return db;
    }

    /// <summary>SavingChanges 回调：自动填充审计字段，模拟生产 AuditInterceptor 行为。</summary>
    private static void AutoFillAuditFields(object? sender, EventArgs _)
    {
        if (sender is not DbContext ctx) return;
        foreach (var entry in ctx.ChangeTracker.Entries())
        {
            if (entry.Entity is IAuditable a)
            {
                a.CreatedBy ??= "test";
                a.UpdatedBy ??= "test";
                if (a.CreatedAt == default) a.CreatedAt = DateTime.UtcNow;
                if (a.UpdatedAt == default) a.UpdatedAt = DateTime.UtcNow;
            }
            if (entry.Entity is IHasOperatorIP o)
                o.OperatorIP ??= "127.0.0.1";
        }
    }

    /// <summary>构造测试用 IConfiguration（提供 JWT 签发所需的 SigningKey/Issuer/Audience）。</summary>
    /// 用字典实现而非 NSubstitute mock：因为 <c>GetValue&lt;T&gt;</c> 是扩展方法，
    /// 内部走 ConfigurationBinder 对 this[key] 做类型转换，mock 对未设置的 key 返回空串会导致 Int32 解析失败。
    /// 字典实现让未设置的 key 返回 null，使扩展方法回退到默认值。
    public static IConfiguration CreateConfig() => new DictionaryConfiguration
    {
        ["Jwt:SigningKey"] = "TestSigningKeyMustBeAtLeast32CharsLong!!",
        ["Jwt:Issuer"] = "test-issuer",
        ["Jwt:Audience"] = "test-audience",
        ["Jwt:AccessTokenMinutes"] = "240",
        ["Jwt:RefreshTokenDays"] = "7",
    };

    /// <summary>填充 IFullAudit 实体的必填审计字段，避免 EF 保存时非空校验失败。</summary>
    public static T WithAudit<T>(T entity) where T : class
    {
        var createdBy = entity.GetType().GetProperty("CreatedBy");
        var updatedBy = entity.GetType().GetProperty("UpdatedBy");
        var operatorIP = entity.GetType().GetProperty("OperatorIP");
        var createdAt = entity.GetType().GetProperty("CreatedAt");
        var updatedAt = entity.GetType().GetProperty("UpdatedAt");
        if (createdBy is not null && createdBy.GetValue(entity) is null or "")
            createdBy.SetValue(entity, "test");
        if (updatedBy is not null && updatedBy.GetValue(entity) is null or "")
            updatedBy.SetValue(entity, "test");
        if (operatorIP is not null && operatorIP.GetValue(entity) is null or "")
            operatorIP.SetValue(entity, "127.0.0.1");
        if (createdAt is not null && (DateTime)createdAt.GetValue(entity)! == default)
            createdAt.SetValue(entity, DateTime.UtcNow);
        if (updatedAt is not null && (DateTime)updatedAt.GetValue(entity)! == default)
            updatedAt.SetValue(entity, DateTime.UtcNow);
        return entity;
    }

    /// <summary>构造一个已持久化的测试用户（含 BCrypt 密码哈希）。</summary>
    public static async Task<UserEntity> SeedUserAsync(
        PlatformDbContext db,
        Guid id,
        string username,
        string password = "Admin@123",
        bool isActive = true,
        int permissionVersion = 0)
    {
        var user = WithAudit(new UserEntity
        {
            Id = id,
            Username = username,
            Email = $"{username}@test.local",
            PasswordHash = BCrypt.Net.BCrypt.HashPassword(password),
            IsActive = isActive,
            PermissionVersion = permissionVersion,
        });
        db.Users.Add(user);
        await db.SaveChangesAsync();
        return user;
    }
}

/// 极简字典实现的 IConfiguration，仅供测试使用。
/// 完整实现 GetSection/GetChildren，让 GetValue&lt;T&gt; 扩展方法（走 ConfigurationBinder）能正确工作。
/// 注意：ConfigurationBinder.GetValue 内部调用 GetSection(key).Value，故必须返回有效 section。
internal sealed class DictionaryConfiguration : IConfiguration
{
    private readonly Dictionary<string, string?> _values = [];

    public string? this[string key]
    {
        get => _values.TryGetValue(key, out var v) ? v : null;
        set => _values[key] = value;
    }

    // 支持集合初始化器语法：new DictionaryConfiguration { ["k"] = "v" }
    public void Add(string key, string? value) => _values[key] = value;

    IEnumerable<IConfigurationSection> IConfiguration.GetChildren() =>
        _values.Select(kv => (IConfigurationSection)new LeafSection(kv.Key, kv.Value)).ToList();

    IChangeToken IConfiguration.GetReloadToken() => EmptyChangeToken.Instance;

    IConfigurationSection IConfiguration.GetSection(string key) =>
        new LeafSection(key, _values.TryGetValue(key, out var v) ? v : null);

    private sealed class LeafSection(string key, string? value) : IConfigurationSection
    {
        public string Key => key;
        public string Path => key;
        public string? Value { get; set; } = value;

        string? IConfiguration.this[string childKey]
        {
            get => null;
            set { }
        }

        IConfigurationSection IConfiguration.GetSection(string childKey) =>
            new LeafSection($"{key}:{childKey}", null);

        IEnumerable<IConfigurationSection> IConfiguration.GetChildren() => [];

        IChangeToken IConfiguration.GetReloadToken() => EmptyChangeToken.Instance;
    }

    /// <summary>永不变更的占位 IChangeToken，避免引入额外包依赖。</summary>
    private sealed class EmptyChangeToken : IChangeToken
    {
        public static readonly EmptyChangeToken Instance = new();
        public bool ActiveChangeCallbacks => false;
        public bool HasChanged => false;
        public IDisposable RegisterChangeCallback(Action<object> callback, object? state) =>
            new NoopDisposable();

        private sealed class NoopDisposable : IDisposable
        {
            public void Dispose() { }
        }
    }
}