using Admin.NET.Core;
using Admin.NET.Plugin.AiDOP.Const.S8;
using Admin.NET.Plugin.AiDOP.Entity.S8;
using Admin.NET.Plugin.AiDOP.Infrastructure;
using Admin.NET.Plugin.AiDOP.Infrastructure.S8;
using Microsoft.Extensions.Logging;

namespace Admin.NET.Plugin.AiDOP.Service.S8;

/// <summary>
/// 三种责任池的<b>统一</b>读侧 seam。
///
/// <para>就绪门禁、复核人候选、升级收件人、通知解析都只需要读。让它们依赖这一个窄接口
/// 而不是"处理池一个接口、复核池另一个接口"，是为了让<b>存储差异只存在一处</b>：
/// HANDLER 在存量表、REVIEWER/ESCALATION 在新表，调用方一律不需要知道。</para>
/// </summary>
public interface IS8RuleResponsibilityReader
{
    /// <summary>池成员账号 Id（原样返回，含可能已失效的历史成员）。</summary>
    Task<IReadOnlyList<long>> GetMemberIdsAsync(long tenantId, string ruleCode, string responsibilityType);

    /// <summary>池成员（含展示信息与有效性标记）。失效成员照样返回、只标 <c>Valid=false</c>。</summary>
    Task<List<S8HandlerUserDto>> GetMembersAsync(long tenantId, string ruleCode, string responsibilityType);

    /// <summary>
    /// 当前<b>真正可用</b>的成员账号 Id（同租户 + 启用）。
    /// <para>运行期解析（升级通知、复核候选）一律用这个，不用 <see cref="GetMemberIdsAsync"/> ——
    /// 把已停用的人算进收件人，会得到一次"发送成功但没人收到"的静默失败。</para>
    /// </summary>
    Task<IReadOnlyList<long>> GetValidMemberIdsAsync(long tenantId, string ruleCode, string responsibilityType);

    /// <summary>该账号是否属于这条规则的某类责任池（停用 / 跨租户成员一律不算数）。</summary>
    Task<bool> IsMemberAsync(long tenantId, string ruleCode, string responsibilityType, long userId);
}

/// <summary>
/// S8-RESPONSIBILITY-POOL-1：复核池 / 升级池的唯一读写实现，并作为三种责任池的统一入口。
///
/// <para><b>HANDLER 内部路由到存量实现</b>（<see cref="IS8RuleHandlerPoolReader"/>），
/// 本服务不复制第二份处理池逻辑 —— 两份人员判据迟早不一致，而不一致的那一刻没有任何报错。</para>
///
/// <para><b>成员合法性一律复用 <see cref="IS8UserScopeValidator"/></b>：
/// 池成员、认领人、复核人、升级收件人必须用同一把尺子，否则会出现
/// 「配得进池、运行时又被拒」这种管理员完全无法自查的状态。</para>
/// </summary>
public class S8RuleResponsibilityPoolService : IS8RuleResponsibilityReader, ITransient
{
    private readonly SqlSugarRepository<AdoS8RuleResponsibilityUser> _rep;
    private readonly IS8RuleHandlerPoolReader _handlerReader;
    private readonly S8RuleHandlerPoolService _handlerWriter;
    private readonly IS8UserScopeValidator _userScope;
    private readonly UserManager _userManager;
    private readonly ILogger<S8RuleResponsibilityPoolService> _logger;

    public S8RuleResponsibilityPoolService(
        SqlSugarRepository<AdoS8RuleResponsibilityUser> rep,
        IS8RuleHandlerPoolReader handlerReader,
        S8RuleHandlerPoolService handlerWriter,
        IS8UserScopeValidator userScope,
        UserManager userManager,
        ILogger<S8RuleResponsibilityPoolService> logger)
    {
        _rep = rep;
        _handlerReader = handlerReader;
        _handlerWriter = handlerWriter;
        _userScope = userScope;
        _userManager = userManager;
        _logger = logger;
    }

    // ────────────────────────────── 读 ──────────────────────────────

    public async Task<IReadOnlyList<long>> GetMemberIdsAsync(long tenantId, string ruleCode, string responsibilityType)
    {
        if (tenantId <= 0 || string.IsNullOrWhiteSpace(ruleCode)) return Array.Empty<long>();

        if (IsHandler(responsibilityType))
            return await _handlerReader.GetMemberIdsAsync(tenantId, ruleCode);

        if (!S8ResponsibilityCatalog.IsStoredInResponsibilityTable(responsibilityType))
            return Array.Empty<long>();

        return await _rep.AsQueryable().ClearFilter()
            .Where(x => x.TenantId == tenantId
                        && x.RuleCode == ruleCode
                        && x.ResponsibilityType == responsibilityType)
            .Select(x => x.UserId)
            .ToListAsync();
    }

    public async Task<List<S8HandlerUserDto>> GetMembersAsync(long tenantId, string ruleCode, string responsibilityType)
    {
        if (IsHandler(responsibilityType))
            return await _handlerReader.GetMembersAsync(tenantId, ruleCode);

        var ids = await GetMemberIdsAsync(tenantId, ruleCode, responsibilityType);
        if (ids.Count == 0) return new List<S8HandlerUserDto>();

        var valid = (await _userScope.ValidateUsersAsync(tenantId, ids)).ToDictionary(u => u.UserId);

        // 失效成员照样返回、只标 Valid=false，不静默过滤：账号被停用或移出租户之后，
        // 管理员必须能在页面上看见"这里有一个人已经不算数了"，而不是眼看着池子无声地少一个人。
        return ids.Distinct().Select(id => valid.TryGetValue(id, out var u)
            ? new S8HandlerUserDto { UserId = id, Account = u.Account, DisplayName = u.DisplayName, Valid = true }
            : new S8HandlerUserDto { UserId = id, Account = string.Empty, DisplayName = "账号已停用或不在本租户", Valid = false })
            .ToList();
    }

    public async Task<IReadOnlyList<long>> GetValidMemberIdsAsync(long tenantId, string ruleCode, string responsibilityType)
    {
        var members = await GetMembersAsync(tenantId, ruleCode, responsibilityType);
        return members.Where(m => m.Valid).Select(m => m.UserId).ToList();
    }

    public async Task<bool> IsMemberAsync(long tenantId, string ruleCode, string responsibilityType, long userId)
    {
        if (IsHandler(responsibilityType))
            return await _handlerReader.IsMemberAsync(tenantId, ruleCode, userId);

        if (tenantId <= 0 || userId <= 0 || string.IsNullOrWhiteSpace(ruleCode)) return false;
        if (!S8ResponsibilityCatalog.IsStoredInResponsibilityTable(responsibilityType)) return false;

        var exists = await _rep.AsQueryable().ClearFilter()
            .Where(x => x.TenantId == tenantId
                        && x.RuleCode == ruleCode
                        && x.ResponsibilityType == responsibilityType
                        && x.UserId == userId)
            .AnyAsync();
        if (!exists) return false;

        // 表里有行 ≠ 现在还算数。判据与运行时完全同源。
        return await _userScope.FindActiveUserAsync(tenantId, userId) != null;
    }

    // ────────────────────────────── 写 ──────────────────────────────

    /// <summary>
    /// 全量替换某条规则某一类责任池的成员。
    ///
    /// <para>成员必须是本租户的启用账号 —— <b>跨租户与不存在共用同一文案</b>，不泄漏存在性。</para>
    /// </summary>
    public async Task SetMembersAsync(S8TrustedScope scope, string ruleCode, string responsibilityType, IEnumerable<long>? userIds)
    {
        if (string.IsNullOrWhiteSpace(ruleCode)) throw new S8BizException("规则编码不能为空");
        if (!S8ResponsibilityCatalog.IsKnown(responsibilityType))
            throw new S8BizException($"未知的责任类型：{responsibilityType}");

        // 处理池仍由存量服务写，保持唯一写入口，不在这里复制一份写逻辑。
        if (IsHandler(responsibilityType))
        {
            await _handlerWriter.SetMembersAsync(scope, ruleCode, userIds);
            return;
        }

        var wanted = (userIds ?? Enumerable.Empty<long>()).Where(x => x > 0).Distinct().ToList();

        if (wanted.Count > 0)
        {
            var validated = await _userScope.ValidateUsersAsync(scope.TenantId, wanted);
            var validIds = validated.Select(u => u.UserId).ToHashSet();
            if (wanted.Any(id => !validIds.Contains(id)))
                throw new S8BizException("所选账号不存在或已停用");
        }

        var existing = await _rep.AsQueryable().ClearFilter()
            .Where(x => x.TenantId == scope.TenantId
                        && x.RuleCode == ruleCode
                        && x.ResponsibilityType == responsibilityType)
            .ToListAsync();

        var existingIds = existing.Select(x => x.UserId).ToHashSet();
        var toRemove = existing.Where(x => !wanted.Contains(x.UserId)).Select(x => x.Id).ToList();
        var toAdd = wanted.Where(id => !existingIds.Contains(id)).ToList();

        if (toRemove.Count > 0)
            await _rep.AsDeleteable().Where(x => toRemove.Contains(x.Id)).ExecuteCommandAsync();

        if (toAdd.Count > 0)
        {
            var now = DateTime.Now;
            await _rep.AsInsertable(toAdd.Select(id => new AdoS8RuleResponsibilityUser
            {
                TenantId = scope.TenantId,
                RuleCode = ruleCode,
                ResponsibilityType = responsibilityType,
                UserId = id,
                CreatedAt = now,
                CreatedBy = _userManager.Account
            }).ToList()).ExecuteCommandAsync();
        }

        _logger.LogInformation(
            "s8_rule_responsibility_pool_updated tenant={Tenant} rule={Rule} type={Type} added={Added} removed={Removed} total={Total}",
            scope.TenantId, ruleCode, responsibilityType, toAdd.Count, toRemove.Count, wanted.Count);
    }

    private static bool IsHandler(string? type) =>
        string.Equals(type, S8ResponsibilityType.Handler, StringComparison.OrdinalIgnoreCase);
}