package controller

import (
	reponse "gofaster/internal/shared/model"
	"gofaster/internal/workflow/model"
	"gofaster/internal/workflow/service"
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"
)

type WorkflowController struct {
	service *service.WorkflowService
	engine  *service.WorkflowEngine
}

func NewWorkflowController(service *service.WorkflowService, engine *service.WorkflowEngine) *WorkflowController {
	return &WorkflowController{
		service: service,
		engine:  engine,
	}
}

// CreateWorkflow 创建新工作流
func (c *WorkflowController) CreateWorkflow(ctx *gin.Context) {
	var workflow model.Workflow
	if err := ctx.ShouldBindJSON(&workflow); err != nil {
		ctx.JSON(http.StatusBadRequest, reponse.NewErrorResponse("无效的请求数据"))
		return
	}

	if err := c.service.CreateWorkflow(&workflow); err != nil {
		ctx.JSON(http.StatusInternalServerError, reponse.NewErrorResponse("创建工作流失败"))
		return
	}

	ctx.JSON(http.StatusCreated, reponse.NewSuccessResponse(workflow))
}

// GetWorkflow 获取工作流详情
func (c *WorkflowController) GetWorkflow(ctx *gin.Context) {
	id, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
	if err != nil {
		ctx.JSON(http.StatusBadRequest, reponse.NewErrorResponse("无效的工作流ID"))
		return
	}

	workflow, err := c.service.GetWorkflowByID(uint(id))
	if err != nil {
		ctx.JSON(http.StatusNotFound, reponse.NewErrorResponse("工作流不存在"))
		return
	}

	ctx.JSON(http.StatusOK, reponse.NewSuccessResponse(workflow))
}

// ListWorkflows 列出工作流
func (c *WorkflowController) ListWorkflows(ctx *gin.Context) {
	page, _ := strconv.Atoi(ctx.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(ctx.DefaultQuery("pageSize", "10"))

	workflows, total, err := c.service.ListWorkflows(page, pageSize)
	if err != nil {
		ctx.JSON(http.StatusInternalServerError, reponse.NewErrorResponse("获取工作流列表失败"))
		return
	}

	ctx.JSON(http.StatusOK, reponse.NewPaginationResponse(workflows, total, page, pageSize))
}

// UpdateWorkflow 更新工作流
func (c *WorkflowController) UpdateWorkflow(ctx *gin.Context) {
	id, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
	if err != nil {
		ctx.JSON(http.StatusBadRequest, reponse.NewErrorResponse("无效的工作流ID"))
		return
	}

	var workflow model.Workflow
	if err := ctx.ShouldBindJSON(&workflow); err != nil {
		ctx.JSON(http.StatusBadRequest, reponse.NewErrorResponse("无效的请求数据"))
		return
	}

	workflow.ID = uint(id)
	if err := c.service.UpdateWorkflow(&workflow); err != nil {
		ctx.JSON(http.StatusInternalServerError, reponse.NewErrorResponse("更新工作流失败"))
		return
	}

	ctx.JSON(http.StatusOK, reponse.NewSuccessResponse(workflow))
}

// DeleteWorkflow 删除工作流
func (c *WorkflowController) DeleteWorkflow(ctx *gin.Context) {
	id, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
	if err != nil {
		ctx.JSON(http.StatusBadRequest, reponse.NewErrorResponse("无效的工作流ID"))
		return
	}

	if err := c.service.DeleteWorkflow(uint(id)); err != nil {
		ctx.JSON(http.StatusInternalServerError, reponse.NewErrorResponse("删除工作流失败"))
		return
	}

	ctx.JSON(http.StatusNoContent, nil)
}

// AddNode 添加工作流节点
func (c *WorkflowController) AddNode(ctx *gin.Context) {
	workflowID, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
	if err != nil {
		ctx.JSON(http.StatusBadRequest, reponse.NewErrorResponse("无效的工作流ID"))
		return
	}

	var node model.WorkflowNode
	if err := ctx.ShouldBindJSON(&node); err != nil {
		ctx.JSON(http.StatusBadRequest, reponse.NewErrorResponse("无效的节点数据"))
		return
	}

	node.WorkflowID = uint(workflowID)
	if err := c.service.AddNode(&node); err != nil {
		ctx.JSON(http.StatusInternalServerError, reponse.NewErrorResponse("添加节点失败"))
		return
	}

	ctx.JSON(http.StatusCreated, reponse.NewSuccessResponse(node))
}

// UpdateNode 更新工作流节点
func (c *WorkflowController) UpdateNode(ctx *gin.Context) {
	nodeID, err := strconv.ParseUint(ctx.Param("node_id"), 10, 32)
	if err != nil {
		ctx.JSON(http.StatusBadRequest, reponse.NewErrorResponse("无效的节点ID"))
		return
	}

	var node model.WorkflowNode
	if err := ctx.ShouldBindJSON(&node); err != nil {
		ctx.JSON(http.StatusBadRequest, reponse.NewErrorResponse("无效的节点数据"))
		return
	}

	node.ID = uint(nodeID)
	if err := c.service.UpdateNode(&node); err != nil {
		ctx.JSON(http.StatusInternalServerError, reponse.NewErrorResponse("更新节点失败"))
		return
	}

	ctx.JSON(http.StatusOK, reponse.NewSuccessResponse(node))
}

// DeleteNode 删除工作流节点
func (c *WorkflowController) DeleteNode(ctx *gin.Context) {
	nodeID, err := strconv.ParseUint(ctx.Param("node_id"), 10, 32)
	if err != nil {
		ctx.JSON(http.StatusBadRequest, reponse.NewErrorResponse("无效的节点ID"))
		return
	}

	if err := c.service.DeleteNode(uint(nodeID)); err != nil {
		ctx.JSON(http.StatusInternalServerError, reponse.NewErrorResponse("删除节点失败"))
		return
	}

	ctx.JSON(http.StatusNoContent, nil)
}

// StartWorkflow 启动工作流实例
func (c *WorkflowController) StartWorkflow(ctx *gin.Context) {
	var req struct {
		WorkflowID uint                   `json:"workflow_id" binding:"required"`
		Data       map[string]interface{} `json:"data"`
	}

	if err := ctx.ShouldBindJSON(&req); err != nil {
		ctx.JSON(http.StatusBadRequest, reponse.NewErrorResponse("无效的请求数据"))
		return
	}

	instance, err := c.engine.StartWorkflow(req.WorkflowID, req.Data)
	if err != nil {
		ctx.JSON(http.StatusInternalServerError, reponse.NewErrorResponse("启动工作流失败"))
		return
	}

	ctx.JSON(http.StatusCreated, reponse.NewSuccessResponse(instance))
}

// ListInstances 列出工作流实例
func (c *WorkflowController) ListInstances(ctx *gin.Context) {
	workflowID, _ := strconv.ParseUint(ctx.Query("workflow_id"), 10, 32)
	page, _ := strconv.Atoi(ctx.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(ctx.DefaultQuery("pageSize", "10"))

	instances, total, err := c.service.ListInstances(uint(workflowID), page, pageSize)
	if err != nil {
		ctx.JSON(http.StatusInternalServerError, reponse.NewErrorResponse("获取实例列表失败"))
		return
	}

	ctx.JSON(http.StatusOK, reponse.NewPaginationResponse(instances, total, page, pageSize))
}

// GetInstance 获取工作流实例详情
func (c *WorkflowController) GetInstance(ctx *gin.Context) {
	id, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
	if err != nil {
		ctx.JSON(http.StatusBadRequest, reponse.NewErrorResponse("无效的实例ID"))
		return
	}

	instance, err := c.service.GetInstanceByID(uint(id))
	if err != nil {
		ctx.JSON(http.StatusNotFound, reponse.NewErrorResponse("工作流实例不存在"))
		return
	}

	ctx.JSON(http.StatusOK, reponse.NewSuccessResponse(instance))
}

// CancelInstance 取消工作流实例
func (c *WorkflowController) CancelInstance(ctx *gin.Context) {
	id, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
	if err != nil {
		ctx.JSON(http.StatusBadRequest, reponse.NewErrorResponse("无效的实例ID"))
		return
	}

	if err := c.service.CancelInstance(uint(id)); err != nil {
		ctx.JSON(http.StatusInternalServerError, reponse.NewErrorResponse("取消实例失败"))
		return
	}

	ctx.JSON(http.StatusOK, reponse.NewSuccessResponse(nil))
}

// ListTasks 列出实例任务
func (c *WorkflowController) ListTasks(ctx *gin.Context) {
	instanceID, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
	if err != nil {
		ctx.JSON(http.StatusBadRequest, reponse.NewErrorResponse("无效的实例ID"))
		return
	}

	tasks, err := c.service.ListTasksByInstance(uint(instanceID))
	if err != nil {
		ctx.JSON(http.StatusInternalServerError, reponse.NewErrorResponse("获取任务列表失败"))
		return
	}

	ctx.JSON(http.StatusOK, reponse.NewSuccessResponse(tasks))
}

// ProcessTask 处理工作流任务
func (c *WorkflowController) ProcessTask(ctx *gin.Context) {
	taskID, err := strconv.ParseUint(ctx.Param("task_id"), 10, 32)
	if err != nil {
		ctx.JSON(http.StatusBadRequest, reponse.NewErrorResponse("无效的任务ID"))
		return
	}

	var req struct {
		UserID uint                   `json:"user_id" binding:"required"`
		Result map[string]interface{} `json:"result"`
	}

	if err := ctx.ShouldBindJSON(&req); err != nil {
		ctx.JSON(http.StatusBadRequest, reponse.NewErrorResponse("无效的请求数据"))
		return
	}

	if err := c.engine.ProcessTask(uint(taskID), req.UserID, req.Result); err != nil {
		ctx.JSON(http.StatusInternalServerError, reponse.NewErrorResponse("处理任务失败"))
		return
	}

	ctx.JSON(http.StatusOK, reponse.NewSuccessResponse(nil))
}

// GetUserTasks 获取用户任务
func (c *WorkflowController) GetUserTasks(ctx *gin.Context) {
	userID, err := strconv.ParseUint(ctx.Query("user_id"), 10, 32)
	if err != nil {
		ctx.JSON(http.StatusBadRequest, reponse.NewErrorResponse("无效的用户ID"))
		return
	}

	status := ctx.Query("status")
	tasks, err := c.service.GetUserTasks(uint(userID), status)
	if err != nil {
		ctx.JSON(http.StatusInternalServerError, reponse.NewErrorResponse("获取用户任务失败"))
		return
	}

	ctx.JSON(http.StatusOK, reponse.NewSuccessResponse(tasks))
}