package servers

import (
	"WiiCITMS/process/common"
	"WiiCITMS/process/oa"
	"context"
	"encoding/json"
	"fmt"

	"github.com/mark3labs/mcp-go/mcp"
	"github.com/mark3labs/mcp-go/server"
)

// OA 工作流相关工具
var OATools = []server.ServerTool{
	// 创建工作流
	{
		Tool: mcp.NewTool(
			"createWorkflow",
			mcp.WithDescription("创建一个工作流定义"),
			mcp.WithString("workflowName", mcp.Required(), mcp.Description("工作流名称")),
			mcp.WithNumber("workflowType", mcp.Required(), mcp.Description("工作流类型: 1-请假, 2-报销, 3-采购, ...")),
			mcp.WithString("description", mcp.Description("工作流描述")),
			mcp.WithString("creatorGuid", mcp.Description("创建人GUID")),
		),
		Handler: func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			workflowName := request.GetString("workflowName", "")
			if workflowName == "" {
				return nil, fmt.Errorf("工作流名称不能为空")
			}
			workflowType := request.GetInt("workflowType", 0)
			if workflowType <= 0 {
				return nil, fmt.Errorf("工作流类型必须大于0")
			}
			description := request.GetString("description", "")
			creatorGuid := request.GetString("creatorGuid", "")

			rep, proc := oa.CreateWorkflow(oa.CreateWorkflowRequest{
				WorkflowName: workflowName,
				WorkflowType: workflowType,
				Description:  description,
				CreatorGuid:  creatorGuid,
			})

			if proc.IsError() {
				return mcp.NewToolResultText(""), proc.Error
			}

			repStr, err := json.Marshal(rep)
			if err != nil {
				return mcp.NewToolResultText(""), err
			}
			return mcp.NewToolResultText(string(repStr)), nil
		},
	},
	// 查询工作流列表
	{
		Tool: mcp.NewTool(
			"queryWorkflows",
			mcp.WithDescription("查询工作流定义列表"),
			mcp.WithString("workflowName", mcp.Description("工作流名称，模糊查询")),
			mcp.WithNumber("workflowType", mcp.Description("工作流类型，-1表示所有类型")),
			mcp.WithBoolean("isActive", mcp.Description("是否只查询启用的工作流")),
			mcp.WithNumber("limit", mcp.Description("分页参数，每页数量")),
			mcp.WithNumber("offset", mcp.Description("分页参数，偏移量")),
		),
		Handler: func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			workflowName := request.GetString("workflowName", "")
			workflowType := request.GetInt("workflowType", -1)
			isActive := request.GetBool("isActive", false)
			limit := request.GetInt("limit", 20)
			offset := request.GetInt("offset", 0)

			rep, proc := oa.QueryWorkflows(oa.QueryWorkflowsRequest{
				WorkflowName: workflowName,
				WorkflowType: workflowType,
				IsActive:     isActive,
				Limit:        limit,
				Offset:       offset,
			})

			if proc.IsError() {
				return mcp.NewToolResultText(""), proc.Error
			}

			repStr, err := json.Marshal(rep)
			if err != nil {
				return mcp.NewToolResultText(""), err
			}
			return mcp.NewToolResultText(string(repStr)), nil
		},
	},
	// 创建工作流节点
	{
		Tool: mcp.NewTool(
			"createWorkflowNode",
			mcp.WithDescription("创建工作流节点"),
			mcp.WithString("workflowGuid", mcp.Required(), mcp.Description("所属工作流ID")),
			mcp.WithString("nodeName", mcp.Required(), mcp.Description("节点名称")),
			mcp.WithNumber("nodeType", mcp.Required(), mcp.Description("节点类型：1-开始, 2-审批, 3-抄送, 4-条件, 5-结束")),
			mcp.WithNumber("nodeOrder", mcp.Required(), mcp.Description("节点顺序")),
			mcp.WithNumber("approverType", mcp.Description("审批人类型：1-指定人, 2-角色, 3-部门负责人")),
			mcp.WithString("approverValue", mcp.Description("审批人值（用户ID、角色ID或JSON）")),
			mcp.WithString("conditionExp", mcp.Description("条件表达式（如果是条件节点）")),
			mcp.WithString("description", mcp.Description("节点描述")),
		),
		Handler: func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			workflowGuid := request.GetString("workflowGuid", "")
			if workflowGuid == "" {
				return nil, fmt.Errorf("工作流ID不能为空")
			}
			nodeName := request.GetString("nodeName", "")
			if nodeName == "" {
				return nil, fmt.Errorf("节点名称不能为空")
			}
			nodeType := request.GetInt("nodeType", 0)
			if nodeType <= 0 || nodeType > 5 {
				return nil, fmt.Errorf("无效的节点类型")
			}
			nodeOrder := request.GetInt("nodeOrder", 0)
			approverType := request.GetInt("approverType", 0)
			approverValue := request.GetString("approverValue", "")
			conditionExp := request.GetString("conditionExp", "")
			description := request.GetString("description", "")

			rep, proc := oa.CreateWorkflowNode(oa.CreateNodeRequest{
				WorkflowGuid:  workflowGuid,
				NodeName:      nodeName,
				NodeType:      nodeType,
				NodeOrder:     nodeOrder,
				ApproverType:  approverType,
				ApproverValue: approverValue,
				ConditionExp:  conditionExp,
				Description:   description,
			})

			if proc.IsError() {
				return mcp.NewToolResultText(""), proc.Error
			}

			repStr, err := json.Marshal(rep)
			if err != nil {
				return mcp.NewToolResultText(""), err
			}
			return mcp.NewToolResultText(string(repStr)), nil
		},
	},
	// 查询工作流节点
	{
		Tool: mcp.NewTool(
			"queryWorkflowNodes",
			mcp.WithDescription("查询工作流节点"),
			mcp.WithString("workflowGuid", mcp.Required(), mcp.Description("工作流ID")),
			mcp.WithNumber("nodeType", mcp.Description("节点类型，-1表示所有类型")),
		),
		Handler: func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			workflowGuid := request.GetString("workflowGuid", "")
			if workflowGuid == "" {
				return nil, fmt.Errorf("工作流ID不能为空")
			}
			nodeType := request.GetInt("nodeType", -1)

			rep, proc := oa.QueryWorkflowNodes(oa.QueryNodesRequest{
				WorkflowGuid: workflowGuid,
				NodeType:     nodeType,
			})

			if proc.IsError() {
				return mcp.NewToolResultText(""), proc.Error
			}

			repStr, err := json.Marshal(rep)
			if err != nil {
				return mcp.NewToolResultText(""), err
			}
			return mcp.NewToolResultText(string(repStr)), nil
		},
	},
	// 启动工作流实例
	{
		Tool: mcp.NewTool(
			"startWorkflowInstance",
			mcp.WithDescription("启动一个工作流实例"),
			mcp.WithString("workflowGuid", mcp.Required(), mcp.Description("工作流ID")),
			mcp.WithString("title", mcp.Required(), mcp.Description("实例标题")),
			mcp.WithNumber("businessType", mcp.Required(), mcp.Description("业务类型: 1-请假, 2-报销, 3-采购, ...")),
			mcp.WithString("businessID", mcp.Required(), mcp.Description("业务ID（如请假记录ID）")),
			mcp.WithString("initiatorGuid", mcp.Required(), mcp.Description("发起人ID")),
			mcp.WithString("formData", mcp.Description("表单数据(JSON格式)")),
		),
		Handler: func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			workflowGuid := request.GetString("workflowGuid", "")
			if workflowGuid == "" {
				return nil, fmt.Errorf("工作流ID不能为空")
			}
			title := request.GetString("title", "")
			if title == "" {
				return nil, fmt.Errorf("实例标题不能为空")
			}
			businessType := request.GetInt("businessType", 0)
			if businessType <= 0 {
				return nil, fmt.Errorf("业务类型必须大于0")
			}
			businessID := request.GetString("businessID", "")
			if businessID == "" {
				return nil, fmt.Errorf("业务ID不能为空")
			}
			initiatorGuid := request.GetString("initiatorGuid", "")
			if initiatorGuid == "" {
				return nil, fmt.Errorf("发起人ID不能为空")
			}
			formData := request.GetString("formData", "")

			// 在服务器端调用时启用权限检查
			rep, proc := oa.StartWorkflowInstance(oa.CreateInstanceRequest{
				WorkflowGuid:  workflowGuid,
				Title:         title,
				BusinessType:  businessType,
				BusinessID:    businessID,
				InitiatorGuid: initiatorGuid,
				FormData:      formData,
			}, true) // 启用权限检查

			if proc.IsError() {
				return mcp.NewToolResultText(""), proc.Error
			}

			repStr, err := json.Marshal(rep)
			if err != nil {
				return mcp.NewToolResultText(""), err
			}
			return mcp.NewToolResultText(string(repStr)), nil
		},
	},
	// 查询工作流实例
	{
		Tool: mcp.NewTool(
			"queryWorkflowInstances",
			mcp.WithDescription("查询工作流实例"),
			mcp.WithString("workflowGuid", mcp.Description("工作流ID，可选")),
			mcp.WithNumber("businessType", mcp.Description("业务类型，-1表示所有类型")),
			mcp.WithString("initiatorGuid", mcp.Description("发起人ID，可选")),
			mcp.WithNumber("status", mcp.Description("状态，-1表示所有状态")),
			mcp.WithNumber("limit", mcp.Description("分页参数，每页数量")),
			mcp.WithNumber("offset", mcp.Description("分页参数，偏移量")),
		),
		Handler: func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			workflowGuid := request.GetString("workflowGuid", "")
			businessType := request.GetInt("businessType", -1)
			initiatorGuid := request.GetString("initiatorGuid", "")
			status := request.GetInt("status", -1)
			limit := request.GetInt("limit", 20)
			offset := request.GetInt("offset", 0)

			rep, proc := oa.QueryWorkflowInstances(oa.QueryInstancesRequest{
				WorkflowGuid:  workflowGuid,
				BusinessType:  businessType,
				InitiatorGuid: initiatorGuid,
				Status:        status,
				Limit:         limit,
				Offset:        offset,
			})

			if proc.IsError() {
				return mcp.NewToolResultText(""), proc.Error
			}

			repStr, err := json.Marshal(rep)
			if err != nil {
				return mcp.NewToolResultText(""), err
			}
			return mcp.NewToolResultText(string(repStr)), nil
		},
	},
	// 取消工作流实例
	{
		Tool: mcp.NewTool(
			"cancelWorkflowInstance",
			mcp.WithDescription("取消工作流实例"),
			mcp.WithString("instanceGuid", mcp.Required(), mcp.Description("工作流实例ID")),
		),
		Handler: func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			instanceGuid := request.GetString("instanceGuid", "")
			if instanceGuid == "" {
				return nil, fmt.Errorf("工作流实例ID不能为空")
			}

			proc := oa.CancelWorkflowInstance(instanceGuid)
			if proc.IsError() {
				return mcp.NewToolResultText(""), proc.Error
			}

			return mcp.NewToolResultText("工作流实例取消成功"), nil
		},
	},
	// 查询审批任务
	{
		Tool: mcp.NewTool(
			"queryMyApprovalTasks",
			mcp.WithDescription("查询我的审批任务"),
			mcp.WithString("approverGuid", mcp.Required(), mcp.Description("审批人ID")),
			mcp.WithNumber("status", mcp.Description("状态，-1表示所有状态")),
			mcp.WithNumber("limit", mcp.Description("分页参数，每页数量")),
			mcp.WithNumber("offset", mcp.Description("分页参数，偏移量")),
		),
		Handler: func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			approverGuid := request.GetString("approverGuid", "")
			if approverGuid == "" {
				return nil, fmt.Errorf("审批人ID不能为空")
			}
			status := request.GetInt("status", -1)
			limit := request.GetInt("limit", 20)
			offset := request.GetInt("offset", 0)

			rep, proc := oa.QueryMyApprovalTasks(oa.QueryMyApprovalTasksRequest{
				ApproverGuid: approverGuid,
				Status:       status,
				Limit:        limit,
				Offset:       offset,
			})

			if proc.IsError() {
				return mcp.NewToolResultText(""), proc.Error
			}

			repStr, err := json.Marshal(rep)
			if err != nil {
				return mcp.NewToolResultText(""), err
			}
			return mcp.NewToolResultText(string(repStr)), nil
		},
	},
	// 查询审批历史
	{
		Tool: mcp.NewTool(
			"queryApprovalHistory",
			mcp.WithDescription("查询流程审批历史"),
			mcp.WithString("instanceGuid", mcp.Required(), mcp.Description("工作流实例ID")),
		),
		Handler: func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			instanceGuid := request.GetString("instanceGuid", "")
			if instanceGuid == "" {
				return nil, fmt.Errorf("工作流实例ID不能为空")
			}

			rep, proc := oa.QueryApprovalHistory(instanceGuid)
			if proc.IsError() {
				return mcp.NewToolResultText(""), proc.Error
			}

			repStr, err := json.Marshal(rep)
			if err != nil {
				return mcp.NewToolResultText(""), err
			}
			return mcp.NewToolResultText(string(repStr)), nil
		},
	},
	// 处理审批
	{
		Tool: mcp.NewTool(
			"processApproval",
			mcp.WithDescription("处理审批任务"),
			mcp.WithString("recordGuid", mcp.Required(), mcp.Description("审批记录ID")),
			mcp.WithNumber("status", mcp.Required(), mcp.Description("操作结果：1-同意，2-拒绝，3-转交，4-委托")),
			mcp.WithString("comment", mcp.Description("审批意见")),
			mcp.WithString("targetGuid", mcp.Description("转交/委托目标人ID（如果是转交或委托操作）")),
		),
		Handler: func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			recordGuid := request.GetString("recordGuid", "")
			if recordGuid == "" {
				return nil, fmt.Errorf("审批记录ID不能为空")
			}
			
			// 获取审批人和实例信息
			approverGuid := request.GetString("approverGuid", "")
			if approverGuid == "" {
				return nil, fmt.Errorf("审批人ID不能为空")
			}
			
			// 获取审批记录对应的实例ID
			instanceGuid, err := oa.GetInstanceGuidByApprovalRecord(recordGuid)
			if err != nil {
				return nil, fmt.Errorf("获取工作流实例ID失败: %v", err)
			}
			
			// 检查权限
			proc := oa.CheckWorkflowPermission(approverGuid, common.OperationApprove, instanceGuid)
			if proc.IsError() {
				return nil, fmt.Errorf("权限检查失败: %v", proc.Error)
			}
			
			status := request.GetInt("status", 0)
			if status < 1 || status > 4 {
				return nil, fmt.Errorf("无效的操作类型")
			}
			comment := request.GetString("comment", "")
			targetGuid := request.GetString("targetGuid", "")

			rep, proc := oa.ProcessApproval(oa.ApprovalActionRequest{
				RecordGuid: recordGuid,
				Status:     status,
				Comment:    comment,
				TargetGuid: targetGuid,
			})

			if proc.IsError() {
				return mcp.NewToolResultText(""), proc.Error
			}

			repStr, err := json.Marshal(rep)
			if err != nil {
				return mcp.NewToolResultText(""), err
			}
			return mcp.NewToolResultText(string(repStr)), nil
		},
	},
}