using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using wispro.sp.entity;
using wispro.sp.entity.workflowInstance;
using wispro.sp.share;

namespace wispro.sp.api.Controllers
{
    [Route("api/[controller]/[action]")]
    [ApiController]
    public class WorkflowEngineController : ControllerBase
    {
        spDbContext Context;

        public WorkflowEngineController(spDbContext context)
        {
            Context = context;
        }

        public void DoAction(int instanceId,int stepId,int ActionId,List<InputValue> inputValues)
        {
            //1、取实例对象

            //2、取步骤对象

            //3、判断Action定义对象

            //4、判断输入值合法性

            //5、保存数据
        }

        [HttpPost]
        public ApiSaveResponse AddNew(NewWorkflowObject workflowObject)
        {
            ApiSaveResponse ret = new ApiSaveResponse();
            ret.Success = true;

            using(var t = Context.Database.BeginTransaction())
            {
                try
                {
                    if (workflowObject.InitAction != null)
                    {
                        Context.Actions.Add(workflowObject.InitAction);
                        Context.SaveChanges();
                    }
                    else
                    {
                        throw new ApplicationException("没有设定初始化Action！");
                    }

                    workflowObject.Workflow.InitActionId  = workflowObject.InitAction.Id;
                    workflowObject.Workflow.CreateTime = DateTime.Now;
                    workflowObject.Workflow.CreateUserId = Context.Staffs.FirstOrDefault<Staff>(s => s.Name == User.Identity.Name).Id;
                    Context.Workflows.Add(workflowObject.Workflow);

                    Context.SaveChanges();
                    t.Commit();
                }
                catch(Exception ex)
                {
                    t.Rollback();
                    ret.Success = false;
                    ret.ErrorMessage = ex.Message;
                }
            }

            return ret;
        }

        public ApiSaveResponse SaveStep(NewStepObject stepObj)
        {
            var ret = new ApiSaveResponse();
            ret.Success = true;
            
            using (var t = Context.Database.BeginTransaction())
            {
                try
                {
                    var step = stepObj.Step;
                    var wf = GetWorkflow(step.workflowId);

                    if(wf == null)
                    {
                        throw new ApplicationException("步骤所属流程不存在！");
                    }

                    if (step.Id == 0)
                    {
                        Context.Steps.Add(step);
                        Context.SaveChanges();

                        if (stepObj.isLastStep)
                        {
                            wf.EndStepId = step.Id;
                        }
                    }
                    else
                    {
                        var temStep = Context.Steps.FirstOrDefault(a => a.Id == step.Id);
                        if (temStep != null)
                        {
                            if(temStep.workflowId != step.workflowId)
                            {
                                throw new ApplicationException("修改步骤时，不能修改步骤所属流程！");
                            }

                            temStep.Name = step.Name;
                            temStep.stepType = step.stepType;
                            temStep.defaultResponseSetting = step.defaultResponseSetting;

                            if (stepObj.isLastStep)
                            {
                                wf.EndStepId = step.Id;
                            }
                        }
                        else
                        {
                            throw new ApplicationException("Id不存在！");
                        }
                    }

                    Context.SaveChanges();
                    t.Commit();
                }
                catch(Exception ex)
                {
                    t.Rollback();
                    ret.Success = false;
                    ret.ErrorMessage = ex.Message;
                }
            }

            return ret;
        }

        public ApiSaveResponse SaveAction(entity.workflowDefine.Action action)
        {
            var ret = new ApiSaveResponse();
            ret.Success = true;
            using (var t = Context.Database.BeginTransaction())
            {
                try
                {

                    if (action.Id == 0)
                    {
                        Context.Actions.Add(action);
                    }
                    else
                    {
                        var temAtion = Context.Actions.FirstOrDefault(a => a.Id == action.Id);
                        if (temAtion != null)
                        {
                            temAtion.InputForm = action.InputForm;
                            temAtion.Name = action.Name;
                            temAtion.StepId = action.StepId;
                            temAtion.inputValuesSettings = action.inputValuesSettings;
                            temAtion.OnActionObjectType = action.OnActionObjectType;
                        }
                        else
                        {
                            throw new ApplicationException("Id不存在！");
                        }

                    }
                    Context.SaveChanges();

                    t.Commit();
                }
                catch (Exception ex)
                {
                    t.Rollback();
                    ret.Success = false;
                    ret.ErrorMessage = ex.Message;
                }
            }

            return ret;
        }

        public ApiSaveResponse SaveTransfer(entity.workflowDefine.TrasferCondition trasfer)
        {
            var ret = new ApiSaveResponse();
            ret.Success = true;

            using (var t = Context.Database.BeginTransaction())
            {
                try
                {
                    
                    

                    if (trasfer.Id == 0)
                    {
                        Context.TrasferConditions.Add(trasfer);
                    }
                    else
                    {
                        var temTransfer = Context.TrasferConditions.FirstOrDefault(a => a.Id == trasfer.Id);
                        if (temTransfer != null)
                        {
                            temTransfer.StepId  = trasfer.StepId;
                            temTransfer.nextStepId = trasfer.nextStepId;
                            temTransfer.Condition = trasfer.Condition;
                        }
                        else
                        {
                            throw new ApplicationException("Id不存在！");
                        }
                    }

                    Context.SaveChanges();
                    t.Commit();
                }
                catch (Exception ex)
                {
                    t.Rollback();
                    ret.Success = false;
                    ret.ErrorMessage = ex.Message;
                }
            }

            return ret;
        }

        public List<entity.workflowDefine.Workflow> GetAllWorkflows()
        {
            return Context.Workflows.Include(d => d.CreateUser).ToList();
        }

        public entity.workflowDefine.Workflow GetWorkflow(int workflowId)
        {
            return Context.Workflows.Include(d=>d.InitAction).Include(d=>d.CreateUser).FirstOrDefault<entity.workflowDefine.Workflow>(w => w.Id == workflowId);
        }

        public List<entity.workflowDefine.Step> GetSteps(int workflowId)
        {
            return Context.Steps.Where<entity.workflowDefine.Step>(w => w.workflowId  == workflowId).ToList();
        }

        public List<entity.workflowDefine.Action> GetActions(int workflowId)
        {
            var workflow = Context.Workflows.FirstOrDefault<entity.workflowDefine.Workflow>(w => w.Id == workflowId);
            return Context.Actions.Include(s=>s.step).Where<entity.workflowDefine.Action>(d => d.step.workflowId == workflowId || d.Id == workflow.InitActionId).ToList();
        }

        public List<entity.workflowDefine.TrasferCondition> GetTrasfers(int workflowId)
        {
            return Context.TrasferConditions.Where(d => d.Step.workflowId == workflowId || d.nextStep.workflowId == workflowId).ToList();
        }

    }
}