using Admin.NET.Core;
using Admin.NET.Plugin.ApprovalFlow;
using Admin.NET.Plugin.ApprovalFlow.Service;
using Admin.NET.Plugin.AiDOP.Entity.S8;
using Microsoft.Extensions.Logging;

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

/// <summary>
/// EXCEPTION_CLOSURE 流程的 Biz 回调（双线合一后已退化为复检审批载体）。
/// 启动点：S8 提交复检；终态由 S8 业务侧（ApproveVerification/RejectVerification）决定。
/// 该 handler 只负责维护 ActiveFlowInstanceId 字段，不再改写 e.Status。
/// </summary>
public class ExceptionClosureBizHandler : IFlowBizHandler, ITransient
{
    public string BizType => "EXCEPTION_CLOSURE";

    private readonly SqlSugarRepository<AdoS8Exception> _rep;
    private readonly SqlSugarRepository<AdoS8ExceptionTimeline> _timelineRep;
    private readonly SqlSugarRepository<ApprovalFlowTask> _taskRep;
    private readonly SqlSugarRepository<SysUser> _userRep;
    private readonly ILogger<ExceptionClosureBizHandler> _logger;

    public ExceptionClosureBizHandler(
        SqlSugarRepository<AdoS8Exception> rep,
        SqlSugarRepository<AdoS8ExceptionTimeline> timelineRep,
        SqlSugarRepository<ApprovalFlowTask> taskRep,
        SqlSugarRepository<SysUser> userRep,
        ILogger<ExceptionClosureBizHandler> logger)
    {
        _rep = rep;
        _timelineRep = timelineRep;
        _taskRep = taskRep;
        _userRep = userRep;
        _logger = logger;
    }

    public async Task OnFlowStarted(long bizId, long instanceId)
    {
        var e = await _rep.GetByIdAsync(bizId) ?? throw new S8BizException("异常不存在");
        e.ActiveFlowInstanceId = instanceId;
        e.ActiveFlowBizType = BizType;
        e.UpdatedAt = DateTime.Now;
        await _rep.UpdateAsync(e);
        await AlignTaskToSelectedVerifierAsync(e, instanceId);
        await InsertTimelineAsync(e.Id, "VERIFY_FLOW_START", "复检审批流启动", instanceId, null);
    }

    /// <summary>
    /// S8-RESPONSIBILITY-POOL-1：把复检任务对齐到<b>页面上选定的那个检验人</b>。
    ///
    /// <para><b>要解决的错位</b>：<c>FlowEngineService.ResolveApprovers</c> 只看流程定义节点的
    /// <c>ApproverType</c> / <c>ApproverIds</c>，<b>完全不读 <c>BizData</c></b> ——
    /// 提交复核时传进去的 <c>verifierUserId</c> 从来没有参与过审批人解析。
    /// 于是「<c>verifier_user_id</c>（业务状态机 authority）」与
    /// 「<c>ApprovalFlowTask.AssigneeId</c>（审批任务 authority）」是两条各走各的链：
    /// UI 选了甲，任务却发给节点角色里的那一组人。当前 UAT 之所以看起来正常，
    /// 只是因为该角色恰好只有一名成员 —— 一旦角色多一个人，错位立刻出现且两边都不报错。</para>
    ///
    /// <para><b>为什么在这里对齐</b>：<c>StartFlow</c> 的顺序是
    /// <c>ProcessNextNode</c>（建任务）→ <c>OnFlowStarted</c>（本回调），
    /// 任务此刻已存在，S8 可以在自己的流程实例上把它指到正确的人。
    /// <b>不改 FlowEngine</b> —— 那是 S1/S5/S6/S7 共用的平台组件，
    /// 为 S8 一家加一条 BizData 动态审批人分支，风险面远超收益。</para>
    ///
    /// <para><b>节点默认或签</b>（一人通过即完成、其余 Pending 自动取消），
    /// 因此把该节点的待办收敛成"选定检验人一个人"不改变流程语义。
    /// 多余的待办直接删除而不是留着：留着就等于池外的人仍然能点通过，
    /// 而 S8 侧的 <c>verifier_user_id</c> 校验又会拒绝他 —— 回到两边互相卡住的老形态。</para>
    ///
    /// <para>对齐失败<b>不回滚</b>已提交的复核（状态与时间线已落库），但必须落 Warning：
    /// 静默失败会让"任务发错人"重新变成无从查起的问题。</para>
    /// </summary>
    private async Task AlignTaskToSelectedVerifierAsync(AdoS8Exception e, long instanceId)
    {
        try
        {
            if (e.VerifierUserId is not > 0) return;
            var verifierId = e.VerifierUserId.Value;

            var pending = await _taskRep.AsQueryable().ClearFilter()
                .Where(t => t.InstanceId == instanceId && t.Status == FlowTaskStatusEnum.Pending)
                .ToListAsync();
            if (pending.Count == 0) return;

            // 已经就是这个人：不写库、不留噪音日志。
            if (pending.Count == 1 && pending[0].AssigneeId == verifierId) return;

            var verifier = await _userRep.AsQueryable().ClearFilter()
                .Where(u => u.Id == verifierId).FirstAsync();

            var keep = pending.FirstOrDefault(t => t.AssigneeId == verifierId) ?? pending[0];
            var drop = pending.Where(t => t.Id != keep.Id).Select(t => t.Id).ToList();

            if (keep.AssigneeId != verifierId)
            {
                keep.AssigneeId = verifierId;
                keep.AssigneeName = verifier?.RealName ?? verifier?.Account;
                await _taskRep.AsUpdateable(keep)
                    .UpdateColumns(t => new { t.AssigneeId, t.AssigneeName })
                    .ExecuteCommandAsync();
            }

            if (drop.Count > 0)
                await _taskRep.AsDeleteable().Where(t => drop.Contains(t.Id)).ExecuteCommandAsync();

            _logger.LogInformation(
                "s8_verify_task_aligned exceptionId={Id} instanceId={Instance} verifierUserId={Verifier} kept={Kept} dropped={Dropped}",
                e.Id, instanceId, verifierId, keep.Id, drop.Count);
        }
        catch (Exception ex)
        {
            _logger.LogWarning(ex,
                "s8_verify_task_align_failed exceptionId={Id} instanceId={Instance} verifierUserId={Verifier}；"
                + "复核已提交但审批任务可能仍指向流程定义里的角色成员，需人工核对",
                e.Id, instanceId, e.VerifierUserId);
        }
    }

    public async Task OnFlowCompleted(long bizId, long instanceId, FlowInstanceStatusEnum finalStatus, long? lastApproverId)
    {
        var e = await _rep.GetByIdAsync(bizId) ?? throw new S8BizException("异常不存在");
        e.ActiveFlowInstanceId = null;
        e.ActiveFlowBizType = null;
        e.UpdatedAt = DateTime.Now;
        await _rep.UpdateAsync(e);

        // 状态由 S8 服务层管控（VERIFY_APPROVED/VERIFY_REJECTED 时间线已写）。
        // 这里只补一条流程级审计标记，便于追溯审批实例终态。
        var label = finalStatus switch
        {
            FlowInstanceStatusEnum.Approved => "复检审批流通过",
            FlowInstanceStatusEnum.Rejected => "复检审批流拒绝",
            FlowInstanceStatusEnum.Cancelled => "复检审批流撤回",
            _ => "复检审批流结束",
        };
        await InsertTimelineAsync(e.Id, "VERIFY_FLOW_END", label, instanceId, lastApproverId);
    }

    public async Task<Dictionary<string, object>> GetBizData(long bizId)
    {
        var e = await _rep.GetByIdAsync(bizId);
        if (e == null) return new Dictionary<string, object>();
        return new Dictionary<string, object>
        {
            ["sceneCode"] = e.SceneCode ?? string.Empty,
            ["factoryCode"] = e.FactoryId.ToString(),
        };
    }

    private async Task InsertTimelineAsync(long exceptionId, string code, string label,
        long? instanceId, long? approverId)
    {
        string? remark = null;
        if (instanceId.HasValue && approverId.HasValue)
            remark = $"审批实例ID: {instanceId}，审批人: {approverId}";
        else if (instanceId.HasValue)
            remark = $"审批实例ID: {instanceId}";
        else if (approverId.HasValue)
            remark = $"审批人: {approverId}";

        await _timelineRep.InsertAsync(new AdoS8ExceptionTimeline
        {
            ExceptionId = exceptionId,
            ActionCode = code,
            ActionLabel = label,
            FromStatus = null,
            ToStatus = null,
            OperatorUserId = approverId,
            ActionRemark = remark,
            CreatedAt = DateTime.Now
        });
    }
}