namespace Admin.NET.Plugin.ApprovalFlow.Service;

/// <summary>
/// 审批任务服务
/// </summary>
[ApiDescriptionSettings(ApprovalFlowConst.GroupName, Order = 90)]
public class FlowTaskService : IDynamicApiController, ITransient
{
    private readonly FlowEngineService _engine;
    private readonly SqlSugarRepository<ApprovalFlowTask> _taskRep;
    private readonly SqlSugarRepository<ApprovalFlowInstance> _instanceRep;
    private readonly UserManager _userManager;

    public FlowTaskService(
        FlowEngineService engine,
        SqlSugarRepository<ApprovalFlowTask> taskRep,
        SqlSugarRepository<ApprovalFlowInstance> instanceRep,
        UserManager userManager)
    {
        _engine = engine;
        _taskRep = taskRep;
        _instanceRep = instanceRep;
        _userManager = userManager;
    }

    // ── 查询 ──

    /// <summary>
    /// 我的待办（分页）
    /// </summary>
    [HttpPost]
    [ApiDescriptionSettings(Name = "MyPendingPage")]
    [DisplayName("我的待办")]
    public async Task<SqlSugarPagedList<TaskPageOutput>> MyPendingPage(TaskPageInput input)
    {
        var userId = _userManager.UserId;
        return await _taskRep.AsQueryable()
            .InnerJoin<ApprovalFlowInstance>((t, i) => t.InstanceId == i.Id)
            .Where((t, i) => t.AssigneeId == userId && t.Status == FlowTaskStatusEnum.Pending)
            .WhereIF(!string.IsNullOrWhiteSpace(input.BizType), (t, i) => i.BizType == input.BizType)
            .OrderByDescending((t, i) => t.CreateTime)
            .Select((t, i) => new TaskPageOutput
            {
                Id = t.Id,
                InstanceId = t.InstanceId,
                NodeId = t.NodeId,
                NodeName = t.NodeName,
                Status = t.Status,
                Title = i.Title,
                BizType = i.BizType,
                BizId = i.BizId,
                BizNo = i.BizNo,
                InitiatorName = i.InitiatorName,
                StartTime = i.StartTime,
                CreateTime = t.CreateTime,
                IsDelegate = t.IsDelegate,
                DelegateForUserName = t.DelegateForUserName,
            })
            .ToPagedListAsync(input.Page, input.PageSize);
    }

    /// <summary>
    /// 我的已办（分页）
    /// </summary>
    [HttpPost]
    [ApiDescriptionSettings(Name = "MyDonePage")]
    [DisplayName("我的已办")]
    public async Task<SqlSugarPagedList<TaskPageOutput>> MyDonePage(TaskPageInput input)
    {
        var userId = _userManager.UserId;
        return await _taskRep.AsQueryable()
            .InnerJoin<ApprovalFlowInstance>((t, i) => t.InstanceId == i.Id)
            .Where((t, i) => t.AssigneeId == userId && t.Status != FlowTaskStatusEnum.Pending)
            .WhereIF(!string.IsNullOrWhiteSpace(input.BizType), (t, i) => i.BizType == input.BizType)
            .OrderByDescending((t, i) => t.ActionTime)
            .Select((t, i) => new TaskPageOutput
            {
                Id = t.Id,
                InstanceId = t.InstanceId,
                NodeId = t.NodeId,
                NodeName = t.NodeName,
                Status = t.Status,
                Comment = t.Comment,
                ActionTime = t.ActionTime,
                Title = i.Title,
                BizType = i.BizType,
                BizId = i.BizId,
                BizNo = i.BizNo,
                InitiatorName = i.InitiatorName,
                StartTime = i.StartTime,
                CreateTime = t.CreateTime,
                IsDelegate = t.IsDelegate,
                DelegateForUserName = t.DelegateForUserName,
            })
            .ToPagedListAsync(input.Page, input.PageSize);
    }

    /// <summary>
    /// 我发起的（分页）
    /// </summary>
    [HttpPost]
    [ApiDescriptionSettings(Name = "MyInitiatedPage")]
    [DisplayName("我发起的")]
    public async Task<SqlSugarPagedList<InstancePageOutput>> MyInitiatedPage(InstancePageInput input)
    {
        var userId = _userManager.UserId;
        var page = await _instanceRep.AsQueryable()
            .Where(i => i.InitiatorId == userId)
            .WhereIF(!string.IsNullOrWhiteSpace(input.BizType), i => i.BizType == input.BizType)
            .WhereIF(input.Status.HasValue, i => i.Status == input.Status!.Value)
            .OrderByDescending(i => i.CreateTime)
            .Select(i => new InstancePageOutput
            {
                Id = i.Id,
                BizType = i.BizType,
                BizId = i.BizId,
                BizNo = i.BizNo,
                Title = i.Title,
                Status = i.Status,
                CurrentNodeId = i.CurrentNodeId,
                StartTime = i.StartTime,
                EndTime = i.EndTime,
                InitiatorName = i.InitiatorName,
            })
            .ToPagedListAsync(input.Page, input.PageSize);

        var runningIds = page.Items.Where(x => x.Status == FlowInstanceStatusEnum.Running).Select(x => x.Id).ToList();
        if (runningIds.Count > 0)
        {
            var pendingAssignees = await _taskRep.AsQueryable()
                .Where(t => runningIds.Contains(t.InstanceId) && t.Status == FlowTaskStatusEnum.Pending)
                .Select(t => new { t.InstanceId, t.AssigneeName })
                .ToListAsync();
            var grouped = pendingAssignees.GroupBy(x => x.InstanceId)
                .ToDictionary(g => g.Key, g => string.Join(", ", g.Select(x => x.AssigneeName).Distinct()));
            foreach (var item in page.Items)
            {
                if (grouped.TryGetValue(item.Id, out var names))
                    item.CurrentAssigneeName = names;
            }
        }

        return page;
    }

    /// <summary>
    /// 待办数量
    /// </summary>
    [HttpGet]
    [ApiDescriptionSettings(Name = "MyPendingCount")]
    [DisplayName("待办数量")]
    public async Task<int> MyPendingCount()
    {
        var userId = _userManager.UserId;
        return await _taskRep.AsQueryable()
            .Where(t => t.AssigneeId == userId && t.Status == FlowTaskStatusEnum.Pending)
            .CountAsync();
    }

    // ── 操作 ──

    /// <summary>
    /// 同意
    /// </summary>
    [HttpPost]
    [ApiDescriptionSettings(Name = "Approve")]
    [DisplayName("同意")]
    public async Task Approve(TaskActionInput input)
    {
        await _engine.Approve(input.TaskId, input.Comment);
    }

    /// <summary>
    /// 拒绝
    /// </summary>
    [HttpPost]
    [ApiDescriptionSettings(Name = "Reject")]
    [DisplayName("拒绝")]
    public async Task Reject(TaskActionInput input)
    {
        await _engine.Reject(input.TaskId, input.Comment);
    }

    /// <summary>
    /// 转办
    /// </summary>
    [HttpPost]
    [ApiDescriptionSettings(Name = "Transfer")]
    [DisplayName("转办")]
    public async Task Transfer(TaskTransferInput input)
    {
        await _engine.Transfer(input.TaskId, input.TargetUserId, input.Comment);
    }

    /// <summary>
    /// 撤回
    /// </summary>
    [HttpPost]
    [ApiDescriptionSettings(Name = "Withdraw")]
    [DisplayName("撤回")]
    public async Task Withdraw(TaskWithdrawInput input)
    {
        await _engine.Withdraw(input.InstanceId);
    }

    /// <summary>
    /// 退回上一步
    /// </summary>
    [HttpPost]
    [ApiDescriptionSettings(Name = "ReturnToPrev")]
    [DisplayName("退回上一步")]
    public async Task ReturnToPrev(TaskActionInput input)
    {
        await _engine.ReturnToPrev(input.TaskId, input.Comment);
    }

    /// <summary>
    /// 加签
    /// </summary>
    [HttpPost]
    [ApiDescriptionSettings(Name = "AddSign")]
    [DisplayName("加签")]
    public async Task AddSign(TaskAddSignInput input)
    {
        await _engine.AddSign(input.TaskId, input.TargetUserId, input.Comment);
    }

    /// <summary>
    /// 升级
    /// </summary>
    [HttpPost]
    [ApiDescriptionSettings(Name = "Escalate")]
    [DisplayName("升级")]
    public async Task Escalate(TaskActionInput input)
    {
        await _engine.Escalate(input.TaskId, input.Comment);
    }

    /// <summary>
    /// 获取指定任务所属节点的升级配置
    /// </summary>
    [HttpGet]
    [ApiDescriptionSettings(Name = "GetEscalationConfig")]
    [DisplayName("获取升级配置")]
    public async Task<EscalationConfigOutput> GetEscalationConfig([FromQuery] long taskId)
    {
        var task = await _taskRep.GetByIdAsync(taskId);
        if (task == null) return new EscalationConfigOutput { Enabled = false };

        var instance = await _instanceRep.GetByIdAsync(task.InstanceId);
        if (instance == null) return new EscalationConfigOutput { Enabled = false };

        var flowData = System.Text.Json.JsonSerializer.Deserialize<ApprovalFlowItem>(instance.FlowJsonSnapshot ?? "{}");
        var node = flowData?.Nodes?.FirstOrDefault(n => n.Id == task.NodeId);
        var props = node?.Properties;

        return new EscalationConfigOutput
        {
            Enabled = props?.EnableManualEscalation == true
                      && !string.IsNullOrWhiteSpace(props?.EscalationApproverType)
                      && !string.IsNullOrWhiteSpace(props?.EscalationApproverIds),
            EscalationApproverNames = props?.EscalationApproverNames,
        };
    }

    /// <summary>
    /// 催办
    /// </summary>
    [HttpPost]
    [ApiDescriptionSettings(Name = "Urge")]
    [DisplayName("催办")]
    public async Task Urge(TaskUrgeInput input)
    {
        await _engine.Urge(input.InstanceId);
    }

    /// <summary>
    /// 立即触发一次超时任务扫描（等价于 FlowTimeoutJob 的单次执行）
    /// 仅 SuperAdmin / SysAdmin 可调用，用于运维排障与 E2E 自动化验收。
    /// </summary>
    [HttpPost]
    [ApiDescriptionSettings(Name = "TriggerTimeoutScan")]
    [DisplayName("立即扫描超时任务")]
    public async Task<int> TriggerTimeoutScan()
    {
        if (!_userManager.SuperAdmin && !_userManager.SysAdmin)
            throw Oops.Oh("仅超级管理员/系统管理员可触发该操作");

        return await _engine.ScanTimeoutTasks();
    }

    /// <summary>
    /// 批量同意
    /// </summary>
    [HttpPost]
    [ApiDescriptionSettings(Name = "BatchApprove")]
    [DisplayName("批量同意")]
    public async Task<BatchActionResult> BatchApprove(BatchActionInput input)
    {
        var result = new BatchActionResult();
        foreach (var taskId in input.TaskIds)
        {
            try
            {
                await _engine.Approve(taskId, input.Comment);
                result.SuccessCount++;
            }
            catch (Exception ex)
            {
                result.FailCount++;
                result.FailItems.Add(new BatchActionFailItem { TaskId = taskId, Error = ex.Message });
            }
        }
        return result;
    }

    /// <summary>
    /// 批量拒绝
    /// </summary>
    [HttpPost]
    [ApiDescriptionSettings(Name = "BatchReject")]
    [DisplayName("批量拒绝")]
    public async Task<BatchActionResult> BatchReject(BatchActionInput input)
    {
        var result = new BatchActionResult();
        foreach (var taskId in input.TaskIds)
        {
            try
            {
                await _engine.Reject(taskId, input.Comment);
                result.SuccessCount++;
            }
            catch (Exception ex)
            {
                result.FailCount++;
                result.FailItems.Add(new BatchActionFailItem { TaskId = taskId, Error = ex.Message });
            }
        }
        return result;
    }
}