using Microsoft.AspNetCore.Http;
using OpenAuth.App.BaseApp.Base;
using OpenAuth.App.Interface;
using OpenAuth.Repository;
using OpenAuth.Repository.Domain;
using OpenAuth.Repository.Domain.workflow;
using SqlSugar;

namespace workflow;

using Microsoft.AspNetCore.Http;
using OpenAuth.App.BaseApp.Base;
using OpenAuth.App.Interface;
using OpenAuth.Repository;
using OpenAuth.Repository.Domain;
using SqlSugar;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

/// <summary>
/// 完整工作流引擎（适配：区县→执法监督科→5个审核科会签→汇总归档/退回）
/// </summary>
public class WorkflowEngineApp : SqlSugarBaseApp<SysCategoryType, SugarDbContext>
{
    private readonly ISqlSugarClient _sqlSugar;

    // 配置：5个审核科角色ID（需与sys_role表对应，自行修改为实际值）
    private readonly List<long> _auditDeptRoleIds = new()
    {
        1, // 政策法规科
        2, // 详细规划科
        3, // 空间规划科
        4, // 开发利用科
        5 // 工程科
    };

    // 配置：执法监督科角色ID（需与sys_role表对应，自行修改为实际值）
    private const long _supervisionDeptRoleId = 6;

    public WorkflowEngineApp(ISugarUnitOfWork<SugarDbContext> unitWork, ISimpleClient<SysCategoryType> repository,
        IAuth auth) : base(unitWork, repository, auth)
    {
        _sqlSugar = Repository.AsSugarClient();
    }

    #region 1. 发起流程（区县提交→流转至执法监督科）

    public long InitiateFlow(long userId, string userName, InitiateFlowRequest request)
    {
        // 参数校验
        if (string.IsNullOrEmpty(request.FlowCode) || string.IsNullOrEmpty(request.BusinessNo))
            throw new Exception("流程编码和业务编号不能为空");
        if (userId <= 0 || string.IsNullOrEmpty(userName))
            throw new Exception("发起人ID和姓名不能为空");

        var instanceId = 0L;

        try
        {
            // 开启事务（基于UnitWork，保障数据一致性）
            UnitWork.Db.Ado.BeginTran();

            // 步骤1：查询启用的流程模板（违法建设认定流程）
            var template = _sqlSugar.Queryable<ZyFlowTemplate>()
                .Where(t => t.FlowCode == request.FlowCode && t.IsEnabled == true)
                .First();
            if (template == null)
                throw new Exception($"流程模板【{request.FlowCode}】不存在或未启用");

            // 步骤2：查询流程开始节点（区县提交）
            var startNode = _sqlSugar.Queryable<ZyFlowNode>()
                .Where(n => n.TemplateId == template.TemplateId && n.NodeType == "Start" && n.NodeName == "区县提交")
                .First();
            if (startNode == null)
                throw new Exception("流程开始节点【区县提交】不存在，请配置节点");

            // 步骤3：插入流程实例，返回自增主键
            var flowInstance = new ZyFlowInstance
            {
                TemplateId = template.TemplateId,
                FlowCode = template.FlowCode,
                BusinessNo = request.BusinessNo,
                Status = "Submitted", // 已提交
                CurrentNodeId = startNode.NodeId,
                InitiatorId = userId,
                InitiatorName = userName,
                CreateTime = DateTime.Now
            };
            instanceId = _sqlSugar.Insertable(flowInstance).ExecuteReturnIdentity();

            // 步骤4：插入开始节点工作项（直接标记为已完成）
            var startWorkitem = new ZyFlowWorkitem
            {
                InstanceId = instanceId,
                NodeId = startNode.NodeId,
                NodeName = startNode.NodeName,
                HandlerId = userId,
                HandlerName = userName,
                Status = "Done", // 已完成
                ReceiveTime = DateTime.Now,
                HandleTime = DateTime.Now,
                Comment = "区县提交业务材料，流程发起成功"
            };
            _sqlSugar.Insertable(startWorkitem).ExecuteCommand();

            // 步骤5：保存流程变量（标题、附件路径等）
            var attachmentPaths = SaveAttachments(request.Attachments);
            var flowVariables = new List<ZyFlowVariable>
            {
                new ZyFlowVariable { InstanceId = instanceId, VarKey = "Title", VarValue = request.Title },
                new ZyFlowVariable { InstanceId = instanceId, VarKey = "AttachmentPaths", VarValue = attachmentPaths },
                new ZyFlowVariable
                {
                    InstanceId = instanceId, VarKey = "SubmitTime",
                    VarValue = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")
                }
            };
            _sqlSugar.Insertable(flowVariables).ExecuteCommand();

            // 步骤6：核心流转：从区县提交节点流转至执法监督科节点
            FlowToNextNode(instanceId, startNode, userId, userName, "区县提交完成，流转至执法监督科");

            // 提交事务
            UnitWork.Db.Ado.CommitTran();
        }
        catch (Exception ex)
        {
            // 回滚事务
            UnitWork.Db.Ado.RollbackTran();
            throw new Exception($"发起流程失败：{ex.Message}", ex);
        }

        return instanceId;
    }

    #endregion

    #region 2. 处理工作项（执法监督科转发/审核科会签/汇总处理）

    public bool HandleWorkitem(long userId, string userName, HandleWorkitemRequest request)
    {
        // 参数校验
        if (request.WorkitemId <= 0)
            throw new Exception("工作项ID无效");
        if (userId <= 0 || string.IsNullOrEmpty(userName))
            throw new Exception("处理人ID和姓名不能为空");

        try
        {
            // 开启事务
            UnitWork.Db.Ado.BeginTran();

            // 步骤1：查询待处理的工作项（仅待办状态可处理）
            var workitem = _sqlSugar.Queryable<ZyFlowWorkitem>()
                .Where(w => w.WorkitemId == request.WorkitemId && w.Status == "ToDo")
                .First();
            if (workitem == null)
                throw new Exception("工作项不存在、已处理或状态异常");

            // 步骤2：查询关联的流程实例和当前节点
            var flowInstance = _sqlSugar.Queryable<ZyFlowInstance>()
                .Where(i => i.InstanceId == workitem.InstanceId)
                .First();
            var currentNode = _sqlSugar.Queryable<ZyFlowNode>()
                .Where(n => n.NodeId == workitem.NodeId)
                .First();
            if (flowInstance == null || currentNode == null)
                throw new Exception("流程实例或流程节点不存在");

            // 步骤3：更新当前工作项为已完成
            workitem.Status = "Done";
            workitem.HandleTime = DateTime.Now;
            workitem.Comment = string.IsNullOrEmpty(request.Comment) ? "处理完成" : request.Comment;
            _sqlSugar.Updateable(workitem).ExecuteCommand();

            // 步骤4：按节点类型分支处理核心逻辑
            switch (currentNode.NodeType)
            {
                // 普通节点：执法监督科转发
                case "Common" when currentNode.NodeName == "执法监督科转发":
                    FlowToNextNode(flowInstance.InstanceId, currentNode, userId, userName, workitem.Comment);
                    break;

                // 并行节点：5个审核科会签
                case "Parallel" when _auditDeptRoleIds.Contains(currentNode.RoleId):
                    ProcessParallelAudit(flowInstance.InstanceId, currentNode.NodeId, userId, userName, request);
                    break;

                // 分支节点：汇总（归档/退回区县）
                case "Branch" when currentNode.NodeName == "汇总":
                    ProcessSummaryNode(flowInstance, currentNode, userId, userName);
                    break;

                // 结束节点：流程归档完成
                case "End":
                    CompleteFlowInstance(flowInstance);
                    break;
            }

            // 提交事务
            UnitWork.Db.Ado.CommitTran();
            return true;
        }
        catch (Exception ex)
        {
            // 回滚事务
            UnitWork.Db.Ado.RollbackTran();
            throw new Exception($"处理工作项失败：{ex.Message}", ex);
        }
    }

    #endregion

    #region 3. 流程查询（我的待办/我的已办）

    /// <summary>
    /// 查询我的待办工作项
    /// </summary>
    public List<FlowQueryResult> QueryMyToDo(long userId)
    {
        if (userId <= 0)
            return new List<FlowQueryResult>();

        // 步骤1：查询当前用户的待办工作项
        var toDoWorkitems = _sqlSugar.Queryable<ZyFlowWorkitem>()
            .Where(w => w.HandlerId == userId && w.Status == "ToDo")
            .ToList();

        // 步骤2：组装返回结果
        var queryResults = new List<FlowQueryResult>();
        foreach (var workitem in toDoWorkitems)
        {
            var flowInstance = _sqlSugar.Queryable<ZyFlowInstance>()
                .Where(i => i.InstanceId == workitem.InstanceId)
                .First();
            if (flowInstance == null)
                continue;

            // 查询流程标题
            var flowTitle = _sqlSugar.Queryable<ZyFlowVariable>()
                .Where(v => v.InstanceId == flowInstance.InstanceId && v.VarKey == "Title")
                .First()?.VarValue ?? string.Empty;

            queryResults.Add(new FlowQueryResult
            {
                InstanceId = flowInstance.InstanceId,
                BusinessNo = flowInstance.BusinessNo,
                Title = flowTitle,
                NodeName = workitem.NodeName,
                Status = flowInstance.Status,
                CreateTime = flowInstance.CreateTime,
                InitiatorName = flowInstance.InitiatorName
            });
        }

        return queryResults;
    }

    /// <summary>
    /// 查询我的已办工作项
    /// </summary>
    public List<FlowQueryResult> QueryMyDone(long userId)
    {
        if (userId <= 0)
            return new List<FlowQueryResult>();

        // 步骤1：查询当前用户已完成的工作项对应的流程实例ID（去重）
        var doneInstanceIds = _sqlSugar.Queryable<ZyFlowWorkitem>()
            .Where(w => w.HandlerId == userId && w.Status == "Done")
            .Select(w => w.InstanceId)
            .Distinct()
            .ToList();

        // 步骤2：组装返回结果
        var queryResults = new List<FlowQueryResult>();
        foreach (var instanceId in doneInstanceIds)
        {
            var flowInstance = _sqlSugar.Queryable<ZyFlowInstance>()
                .Where(i => i.InstanceId == instanceId)
                .First();
            if (flowInstance == null)
                continue;

            // 查询流程标题
            var flowTitle = _sqlSugar.Queryable<ZyFlowVariable>()
                .Where(v => v.InstanceId == flowInstance.InstanceId && v.VarKey == "Title")
                .First()?.VarValue ?? string.Empty;

            // 查询最新的已完成工作项
            var lastWorkitem = _sqlSugar.Queryable<ZyFlowWorkitem>()
                .Where(w => w.InstanceId == instanceId && w.Status == "Done")
                .OrderByDescending(w => w.HandleTime)
                .First();

            queryResults.Add(new FlowQueryResult
            {
                InstanceId = flowInstance.InstanceId,
                BusinessNo = flowInstance.BusinessNo,
                Title = flowTitle,
                NodeName = lastWorkitem?.NodeName ?? string.Empty,
                Status = flowInstance.Status,
                CreateTime = flowInstance.CreateTime,
                InitiatorName = flowInstance.InitiatorName
            });
        }

        return queryResults;
    }

    #endregion

    #region 4. 核心辅助方法（流转/会签/汇总/附件等）

    /// <summary>
    /// 流程节点流转核心方法
    /// </summary>
    private void FlowToNextNode(long instanceId, ZyFlowNode currentNode, long userId, string userName, string comment)
    {
        // 解析下一节点IDs
        var nextNodeIds = currentNode.NextNodeIds?.Split(',', StringSplitOptions.RemoveEmptyEntries)
            .Select(long.Parse)
            .ToList() ?? new List<long>();
        if (!nextNodeIds.Any())
            return;

        // 查询流程实例
        var flowInstance = _sqlSugar.Queryable<ZyFlowInstance>()
            .Where(i => i.InstanceId == instanceId)
            .First();
        if (flowInstance == null)
            throw new Exception("流程实例不存在");

        // 遍历处理每个下一节点
        foreach (var nextNodeId in nextNodeIds)
        {
            var nextNode = _sqlSugar.Queryable<ZyFlowNode>()
                .Where(n => n.NodeId == nextNodeId)
                .First();
            if (nextNode == null)
                continue;

            // 更新流程实例当前节点和状态
            flowInstance.CurrentNodeId = nextNode.NodeId;
            flowInstance.Status = GetFlowStatusByNodeType(nextNode.NodeType);
            _sqlSugar.Updateable(flowInstance).ExecuteCommand();

            // 并行节点（5个审核科）：为每个审核科创建工作项
            if (nextNode.NodeType == "Parallel")
            {
                foreach (var roleId in _auditDeptRoleIds)
                {
                    CreateAuditDeptWorkitem(instanceId, nextNode, roleId);
                }
            }
            // 普通节点/分支节点：创建单个工作项
            else
            {
                var nextWorkitem = new ZyFlowWorkitem
                {
                    InstanceId = instanceId,
                    NodeId = nextNode.NodeId,
                    NodeName = nextNode.NodeName,
                    HandlerId = userId,
                    HandlerName = userName,
                    Status = "ToDo",
                    ReceiveTime = DateTime.Now,
                    Comment = comment
                };
                _sqlSugar.Insertable(nextWorkitem).ExecuteCommand();
            }
        }
    }

    /// <summary>
    /// 处理并行会签（保存结果+判断是否全部完成）
    /// </summary>
    private void ProcessParallelAudit(long instanceId, long nodeId, long userId, string userName,
        HandleWorkitemRequest request)
    {
        // 校验会签结果
        if (string.IsNullOrEmpty(request.AuditResult))
            throw new Exception("会签需选择审核结果（Pass/Reject）");

        // 步骤1：获取当前用户所属科室名称
        var deptName = GetUserDeptName(userId);

        // 步骤2：保存会签记录
        var parallelAudit = new ZyFlowParallelAudit
        {
            InstanceId = instanceId,
            NodeId = nodeId,
            DeptName = deptName,
            AuditResult = request.AuditResult,
            AuditComment = request.Comment,
            AuditorId = userId,
            AuditorName = userName,
            AuditTime = DateTime.Now
        };
        _sqlSugar.Insertable(parallelAudit).ExecuteCommand();

        // 步骤3：判断是否所有审核科都已完成会签
        if (IsAllAuditCompleted(instanceId))
        {
            // 步骤4：流转至汇总节点
            var parallelNode = _sqlSugar.Queryable<ZyFlowNode>()
                .Where(n => n.NodeId == nodeId && n.NodeType == "Parallel")
                .First();
            FlowToNextNode(instanceId, parallelNode, userId, userName, "所有审核科会签完成，流转至汇总节点");
        }
    }

    /// <summary>
    /// 处理汇总节点（归档/退回区县）
    /// </summary>
    private void ProcessSummaryNode(ZyFlowInstance flowInstance, ZyFlowNode summaryNode, long userId, string userName)
    {
        // 步骤1：判断是否全部审核通过
        var isAllPass = _sqlSugar.Queryable<ZyFlowParallelAudit>()
            .Where(a => a.InstanceId == flowInstance.InstanceId)
            .Any(a=> a.AuditResult != "Pass");

        // todo 
        // 步骤2：解析汇总节点下一节点（归档/退回）
        var nextNodeIds = summaryNode.NextNodeIds?.Split(',', StringSplitOptions.RemoveEmptyEntries)
            .Select(long.Parse)
            .ToList() ?? new List<long>();
        if (nextNodeIds.Count < 2)
            throw new Exception("汇总节点需配置2个后续节点（归档/退回区县）");

        // 步骤3：确定目标节点（通过→归档，不通过→退回）
        var targetNodeId = !isAllPass ? nextNodeIds[0] : nextNodeIds[1];
        var targetNode = _sqlSugar.Queryable<ZyFlowNode>()
            .Where(n => n.NodeId == targetNodeId)
            .First();
        if (targetNode == null)
            return;

        // 步骤4：创建目标节点工作项
        var summaryWorkitem = new ZyFlowWorkitem
        {
            InstanceId = flowInstance.InstanceId,
            NodeId = targetNode.NodeId,
            NodeName = targetNode.NodeName,
            HandlerId = isAllPass ? null : flowInstance.InitiatorId,
            HandlerName = isAllPass ? "系统自动处理" : flowInstance.InitiatorName,
            Status = isAllPass ? "Done" : "ToDo",
            ReceiveTime = DateTime.Now,
            HandleTime = isAllPass ? DateTime.Now : null,
            Comment = isAllPass ? "所有审核科通过，流程归档完成" : "存在审核不通过项，退回区县修改"
        };
        _sqlSugar.Insertable(summaryWorkitem).ExecuteCommand();

        // 步骤5：更新流程实例最终状态
        flowInstance.CurrentNodeId = targetNode.NodeId;
        flowInstance.Status = isAllPass ? "Completed" : "Rejected";
        flowInstance.FinishTime = isAllPass ? DateTime.Now : null;
        _sqlSugar.Updateable(flowInstance).ExecuteCommand();
    }

    /// <summary>
    /// 完成流程实例（结束节点）
    /// </summary>
    private void CompleteFlowInstance(ZyFlowInstance flowInstance)
    {
        flowInstance.Status = "Completed";
        flowInstance.FinishTime = DateTime.Now;
        _sqlSugar.Updateable(flowInstance).ExecuteCommand();
    }

    /// <summary>
    /// 为审核科创建工作项
    /// </summary>
    private void CreateAuditDeptWorkitem(long instanceId, ZyFlowNode parallelNode, long roleId)
    {
        // 获取科室用户信息
        var (userId, userName, deptName) = GetRoleFirstUserInfo(roleId);
        if (userId <= 0 || string.IsNullOrEmpty(userName))
            throw new Exception($"审核科角色【{roleId}】未配置有效用户");

        // 创建工作项
        var workitem = new ZyFlowWorkitem
        {
            InstanceId = instanceId,
            NodeId = parallelNode.NodeId,
            NodeName = $"{parallelNode.NodeName}（{deptName}）",
            HandlerId = userId,
            HandlerName = userName,
            Status = "ToDo",
            ReceiveTime = DateTime.Now,
            Comment = "请完成违法建设认定相关审核工作"
        };
        _sqlSugar.Insertable(workitem).ExecuteCommand();
    }

    /// <summary>
    /// 保存附件并返回路径
    /// </summary>
    private string SaveAttachments(List<IFormFile> attachments)
    {
        if (attachments == null || !attachments.Any())
            return string.Empty;

        // 定义附件存储目录
        var uploadDir = Path.Combine(Directory.GetCurrentDirectory(), "wwwroot/Attachments/FlowAttachments");
        if (!Directory.Exists(uploadDir))
            Directory.CreateDirectory(uploadDir);

        var attachmentPaths = new List<string>();
        foreach (var file in attachments)
        {
            if (file.Length <= 0)
                continue;

            // 生成唯一文件名
            var fileName = $"{Guid.NewGuid()}{Path.GetExtension(file.FileName)}";
            var filePath = Path.Combine(uploadDir, fileName);

            // 保存文件
            using (var stream = new FileStream(filePath, FileMode.Create))
            {
                file.CopyTo(stream);
            }

            // 保存相对路径（用于前端访问）
            attachmentPaths.Add($"/Attachments/FlowAttachments/{fileName}");
        }

        return string.Join(",", attachmentPaths);
    }

    /// <summary>
    /// 根据节点类型获取流程状态
    /// </summary>
    private string GetFlowStatusByNodeType(string nodeType)
    {
        return nodeType switch
        {
            "Common" => "Forwarded", // 已转发
            "Parallel" => "Auditing", // 审核中
            "Branch" => "Summarized", // 已汇总
            "End" => "Completed", // 已完成
            _ => "Submitted" // 已提交
        };
    }

    /// <summary>
    /// 判断所有审核科是否完成会签
    /// </summary>
    private bool IsAllAuditCompleted(long instanceId)
    {
        var auditResults = _sqlSugar.Queryable<ZyFlowParallelAudit>()
            .Where(a => a.InstanceId == instanceId)
            .ToList();

        // 条件：会签记录数=5个审核科 且 无待审核状态
        return auditResults.Count == _auditDeptRoleIds.Count && !auditResults.Any(a => a.AuditResult == "Pending");
    }

    /// <summary>
    /// 获取用户所属科室名称
    /// </summary>
    private string GetUserDeptName(long userId)
    {
        var deptName = _sqlSugar.Queryable<SysUserOrg, SysOrg>((uo, o) => new JoinQueryInfos(
                JoinType.Inner, uo.OrgId == o.Id))
            .Where((uo, o) => uo.UserId == userId)
            .Select((uo, o) => o.Name)
            .First();

        return deptName ?? "未知科室";
    }

    /// <summary>
    /// 获取角色下第一个用户ID
    /// </summary>
    private long GetRoleFirstUserId(long roleId)
    {
        var userInfo = GetRoleFirstUserInfo(roleId);
        return userInfo.userId;
    }

    /// <summary>
    /// 获取角色下第一个用户姓名
    /// </summary>
    private string GetRoleFirstUserName(long roleId)
    {
        var userInfo = GetRoleFirstUserInfo(roleId);
        return userInfo.userName;
    }

    /// <summary>
    /// 获取角色下第一个用户的完整信息
    /// </summary>
    private (long userId, string userName, string deptName) GetRoleFirstUserInfo(long roleId)
    {
        var sql = @"
            SELECT 
                u.""Id"" as UserId, 
                u.""Name"" as UserName, 
                o.""Name"" as DeptName
            FROM sys_user u
            INNER JOIN sys_userrole r ON u.""Id"" = r.""UserId""
            INNER JOIN sys_userorg uo ON u.""Id"" = uo.""UserId""
            INNER JOIN sys_org o ON uo.""OrgId"" = o.""Id""
            WHERE r.""RoleId"" = @RoleId
            LIMIT 1";

        var userInfo = _sqlSugar.SqlQueryable<dynamic>(sql)
            .AddParameters(new { RoleId = roleId })
            .First();

        return (userInfo.UserId, userInfo.UserName ?? string.Empty, userInfo.DeptName ?? string.Empty);
    }

    #endregion
}