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>配置页的一行：一个事件 + 它当前配置的收件人类型。</summary>
public sealed class S8NotifyEventRowDto
{
    public string EventCode { get; set; } = string.Empty;
    public string DisplayName { get; set; } = string.Empty;
    public string TriggerHint { get; set; } = string.Empty;
    public int OrderNo { get; set; }
    public List<string> RecipientTypes { get; set; } = new();
    /// <summary>SPECIFIC_USER 选中的账号。</summary>
    public List<long> SpecificUserIds { get; set; } = new();
    /// <summary>本事件尚未配置任何收件人 —— 会回落 LEGACY 分层，页面必须说明。</summary>
    public bool NotConfigured => RecipientTypes.Count == 0;
}

/// <summary>
/// 「通知设置」页的一行：一个事件 + 它提醒谁（业务文案）+ 是否启用。
/// <para>页面上不出现任何收件人技术枚举 —— 对象由责任关系推导。</para>
/// </summary>
public sealed class S8NotifyEventSwitchDto
{
    public string EventCode { get; set; } = string.Empty;
    public string DisplayName { get; set; } = string.Empty;
    public string TriggerHint { get; set; } = string.Empty;
    public int OrderNo { get; set; }

    /// <summary>是否已在新模型里启用通知。</summary>
    public bool Enabled { get; set; }

    /// <summary>提醒谁（业务文案，如「处理人员」「当前复核人」）。只读展示。</summary>
    public string RecipientLabel { get; set; } = string.Empty;

    /// <summary>当前配置是否就是代码级默认推导。false = 历史手工配置与默认不同，页面需提示。</summary>
    public bool MatchesDerivedDefault { get; set; } = true;
}

/// <summary>
/// S8-NOTIFY-RECIPIENT-1：收件人配置的读写。
///
/// <para><b>写入侧只认目录内的事件与类型</b>，并对 SPECIFIC_USER 逐个校验账号
/// （同租户 + 启用，复用 <see cref="IS8UserScopeValidator"/>）——
/// 让「配得进去、发的时候又发不出」这种状态在写入那一刻就不可能产生。</para>
/// </summary>
public class S8NotificationRecipientConfigService : ITransient
{
    private readonly SqlSugarRepository<AdoS8NotificationRecipient> _rep;
    private readonly IS8UserScopeValidator _userScope;
    private readonly UserManager _userManager;
    private readonly ILogger<S8NotificationRecipientConfigService> _logger;

    public S8NotificationRecipientConfigService(
        SqlSugarRepository<AdoS8NotificationRecipient> rep,
        IS8UserScopeValidator userScope,
        UserManager userManager,
        ILogger<S8NotificationRecipientConfigService> logger)
    {
        _rep = rep;
        _userScope = userScope;
        _userManager = userManager;
        _logger = logger;
    }

    /// <summary>某条规则（或租户默认）的事件矩阵。目录里每个事件都出一行，未配置的也要出现。</summary>
    public async Task<List<S8NotifyEventRowDto>> GetMatrixAsync(long tenantId, string ruleCode)
    {
        var rows = await _rep.AsQueryable().ClearFilter()
            .Where(x => x.TenantId == tenantId && x.RuleCode == ruleCode)
            .ToListAsync();

        var byEvent = rows.GroupBy(x => x.EventCode, StringComparer.OrdinalIgnoreCase)
            .ToDictionary(g => g.Key, g => g.ToList(), StringComparer.OrdinalIgnoreCase);

        return S8NotificationCatalog.Events.OrderBy(e => e.OrderNo).Select(e =>
        {
            var cfg = byEvent.GetValueOrDefault(e.Code) ?? new List<AdoS8NotificationRecipient>();
            var specific = cfg.FirstOrDefault(c => c.RecipientType == S8RecipientType.SpecificUser);
            return new S8NotifyEventRowDto
            {
                EventCode = e.Code,
                DisplayName = e.DisplayName,
                TriggerHint = e.TriggerHint,
                OrderNo = e.OrderNo,
                RecipientTypes = cfg.Select(c => c.RecipientType).Distinct().ToList(),
                SpecificUserIds = S8RoleResolver.SplitTokens(specific?.RecipientUserIds)
                    .Select(t => long.TryParse(t, out var v) ? v : 0).Where(v => v > 0).ToList()
            };
        }).ToList();
    }

    /// <summary>
    /// S8-RESPONSIBILITY-POOL-1：业务视角的事件开关矩阵。
    ///
    /// <para>业务用户只回答「这件事要不要提醒」；<b>提醒谁由责任关系推导</b>
    /// （见 <see cref="S8NotificationCatalog.DefaultRecipientByEvent"/>），
    /// 页面上不出现 <c>HANDLER_POOL</c> / <c>ASSIGNEE</c> 这类技术枚举。</para>
    /// </summary>
    public async Task<List<S8NotifyEventSwitchDto>> GetEventSwitchesAsync(long tenantId, string ruleCode)
    {
        var matrix = await GetMatrixAsync(tenantId, ruleCode);
        var byEvent = matrix.ToDictionary(m => m.EventCode, StringComparer.OrdinalIgnoreCase);

        return S8NotificationCatalog.Events.OrderBy(e => e.OrderNo).Select(e =>
        {
            var derived = S8NotificationCatalog.ResolveDefaultRecipientType(e.Code);
            var cfg = byEvent.GetValueOrDefault(e.Code);
            var configured = cfg?.RecipientTypes ?? new List<string>();

            // 「已启用」= 该事件在新模型里有任何收件人配置。
            // 未启用时刻意**不**声称"不会通知"——旧 LEGACY 分层仍可能兜底，
            // 页面据此显示"未启用（可能仍走旧配置）"，而不是给一个会骗人的关闭态。
            return new S8NotifyEventSwitchDto
            {
                EventCode = e.Code,
                DisplayName = e.DisplayName,
                TriggerHint = e.TriggerHint,
                OrderNo = e.OrderNo,
                Enabled = configured.Count > 0,
                RecipientLabel = S8NotificationCatalog.DescribeRecipientType(
                    configured.FirstOrDefault() ?? derived),
                // 已配置的类型与代码级默认不一致 —— 通常是上一版手工配过。
                // 不静默改写，只标出来让管理员知道这一行与默认推导不同。
                MatchesDerivedDefault = configured.Count == 0
                                        || (configured.Count == 1 && string.Equals(
                                                configured[0], derived, StringComparison.OrdinalIgnoreCase)),
            };
        }).ToList();
    }

    /// <summary>
    /// 按事件开关写入 / 移除收件人配置。收件人类型由目录推导，<b>调用方不传</b>。
    ///
    /// <para>这是「通知设置」页唯一的写入口：业务用户点的是开关，
    /// 落库的仍是既有的收件人模型 —— 内部实现保留，只是不再暴露给页面。</para>
    /// </summary>
    public async Task SetEventEnabledAsync(S8TrustedScope scope, string ruleCode, string eventCode, bool enabled)
    {
        if (!S8NotificationCatalog.IsKnownEvent(eventCode))
            throw new S8BizException($"未知事件码：{eventCode}");

        var derived = S8NotificationCatalog.ResolveDefaultRecipientType(eventCode)
            ?? throw new S8BizException($"事件 {eventCode} 没有默认收件人推导规则，无法按开关配置");

        await SetAsync(scope, ruleCode, eventCode,
            enabled ? new[] { derived } : Array.Empty<string>(), null);
    }

    /// <summary>全量替换某事件的收件人配置。</summary>
    public async Task SetAsync(S8TrustedScope scope, string ruleCode, string eventCode,
        IEnumerable<string>? recipientTypes, IEnumerable<long>? specificUserIds)
    {
        if (string.IsNullOrWhiteSpace(ruleCode)) throw new S8BizException("规则编码不能为空");
        if (!S8NotificationCatalog.IsKnownEvent(eventCode))
            throw new S8BizException($"未知事件码：{eventCode}");

        var types = (recipientTypes ?? Enumerable.Empty<string>())
            .Where(t => !string.IsNullOrWhiteSpace(t)).Distinct(StringComparer.OrdinalIgnoreCase).ToList();

        var unknown = types.Where(t => !S8NotificationCatalog.IsKnownRecipientType(t)).ToList();
        if (unknown.Count > 0)
            throw new S8BizException($"未知收件人类型：{string.Join('、', unknown)}");

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

        if (types.Contains(S8RecipientType.SpecificUser, StringComparer.OrdinalIgnoreCase))
        {
            if (users.Count == 0)
                throw new S8BizException("已选择「指定账号」，请至少选择一个账号");

            var valid = (await _userScope.ValidateUsersAsync(scope.TenantId, users)).Select(u => u.UserId).ToHashSet();
            if (users.Any(id => !valid.Contains(id)))
                // 与人员校验同口径：跨租户与不存在共用同一文案，不泄漏存在性。
                throw new S8BizException("所选账号不存在或已停用");
        }
        else
        {
            // 没勾「指定账号」就不该留下账号列表 —— 留着会在下次勾选时悄悄复活一批旧人选。
            users.Clear();
        }

        await _rep.AsDeleteable()
            .Where(x => x.TenantId == scope.TenantId && x.RuleCode == ruleCode && x.EventCode == eventCode)
            .ExecuteCommandAsync();

        if (types.Count > 0)
        {
            var now = DateTime.Now;
            await _rep.AsInsertable(types.Select(t => new AdoS8NotificationRecipient
            {
                TenantId = scope.TenantId,
                RuleCode = ruleCode,
                EventCode = eventCode,
                RecipientType = t,
                RecipientUserIds = t.Equals(S8RecipientType.SpecificUser, StringComparison.OrdinalIgnoreCase)
                    ? string.Join(',', users)
                    : null,
                CreatedAt = now,
                CreatedBy = _userManager.Account
            }).ToList()).ExecuteCommandAsync();
        }

        _logger.LogInformation(
            "s8_notify_recipient_updated tenant={Tenant} rule={Rule} event={Event} types={Types} users={Users}",
            scope.TenantId, ruleCode, eventCode, string.Join(',', types), users.Count);
    }
}