// Package handler provides HTTP handlers for various endpoints.
package handler

import (
	"net/http"

	"modelRT/database"
	"modelRT/diagram"
	"modelRT/logger"
	"modelRT/network"

	"github.com/bitly/go-simplejson"
	"github.com/gin-gonic/gin"
)

// CircuitDiagramUpdateHandler define circuit diagram update process API
func CircuitDiagramUpdateHandler(c *gin.Context) {
	pgClient := database.GetPostgresDBClient()

	var request network.CircuitDiagramUpdateRequest
	if err := c.ShouldBindJSON(&request); err != nil {
		logger.Error(c, "unmarshal circuit diagram update info failed", "error", err)

		resp := network.FailureResponse{
			Code: http.StatusBadRequest,
			Msg:  err.Error(),
		}
		c.JSON(http.StatusOK, resp)
		return
	}

	graph, err := diagram.GetGraphMap(request.PageID)
	if err != nil {
		logger.Error(c, "get topologic data from set by pageID failed", "error", err)

		resp := network.FailureResponse{
			Code: http.StatusBadRequest,
			Msg:  err.Error(),
			PayLoad: map[string]interface{}{
				"page_id": request.PageID,
			},
		}
		c.JSON(http.StatusOK, resp)
		return
	}

	var topologicChangeInfos []network.TopologicUUIDChangeInfos
	for _, topologicLink := range request.TopologicLinks {
		changeInfo, err := network.ParseUUID(topologicLink)
		if err != nil {
			logger.Error(c, "format uuid from string failed", "error", err)

			resp := network.FailureResponse{
				Code: http.StatusBadRequest,
				Msg:  err.Error(),
				PayLoad: map[string]interface{}{
					"topologic_info": topologicLink,
				},
			}
			c.JSON(http.StatusOK, resp)
			return
		}
		topologicChangeInfos = append(topologicChangeInfos, changeInfo)
	}

	// open transaction
	tx := pgClient.Begin()

	for _, topologicChangeInfo := range topologicChangeInfos {
		err = database.UpdateTopologicIntoDB(c, tx, request.PageID, topologicChangeInfo)
		if err != nil {
			tx.Rollback()

			logger.Error(c, "update topologic info into DB failed", "topologic_info", topologicChangeInfo, "error", err)

			resp := network.FailureResponse{
				Code: http.StatusBadRequest,
				Msg:  err.Error(),
				PayLoad: map[string]interface{}{
					"topologic_info": topologicChangeInfo,
				},
			}
			c.JSON(http.StatusOK, resp)
			return
		}

		err = graph.UpdateEdge(topologicChangeInfo)
		if err != nil {
			tx.Rollback()

			logger.Error(c, "update topologic info failed", "topologic_info", topologicChangeInfo, "error", err)

			resp := network.FailureResponse{
				Code: http.StatusBadRequest,
				Msg:  err.Error(),
				PayLoad: map[string]interface{}{
					"topologic_info": topologicChangeInfo,
				},
			}
			c.JSON(http.StatusOK, resp)
			return
		}
	}

	for index, componentInfo := range request.ComponentInfos {
		componentID, err := database.UpdateComponentIntoDB(c, tx, componentInfo)
		if err != nil {
			logger.Error(c, "udpate component info into DB failed", "error", err)

			resp := network.FailureResponse{
				Code: http.StatusBadRequest,
				Msg:  err.Error(),
				PayLoad: map[string]interface{}{
					"page_id":        request.PageID,
					"component_info": request.ComponentInfos,
				},
			}
			c.JSON(http.StatusOK, resp)
			return
		}

		request.ComponentInfos[index].ID = componentID

		err = database.UpdateModelIntoDB(c, tx, componentID, componentInfo.ComponentType, componentInfo.Params)
		if err != nil {
			logger.Error(c, "udpate component model info into DB failed", "error", err)

			resp := network.FailureResponse{
				Code: http.StatusBadRequest,
				Msg:  err.Error(),
				PayLoad: map[string]interface{}{
					"page_id":        request.PageID,
					"component_info": request.ComponentInfos,
				},
			}
			c.JSON(http.StatusOK, resp)
			return
		}
	}

	for _, componentInfo := range request.ComponentInfos {
		paramsJSON, err := simplejson.NewJson([]byte(componentInfo.Params))
		if err != nil {
			logger.Error(c, "unmarshal component info by concurrent map failed", "component_params", componentInfo.Params, "error", err)

			resp := network.FailureResponse{
				Code: http.StatusBadRequest,
				Msg:  err.Error(),
				PayLoad: map[string]interface{}{
					"uuid":             componentInfo.UUID,
					"component_params": componentInfo.Params,
				},
			}
			c.JSON(http.StatusOK, resp)
			return
		}

		componentMap, err := paramsJSON.Map()
		if err != nil {
			logger.Error(c, "format params json info to map failed", "error", err)

			resp := network.FailureResponse{
				Code: http.StatusBadRequest,
				Msg:  err.Error(),
				PayLoad: map[string]interface{}{
					"uuid":             componentInfo.UUID,
					"component_params": componentInfo.Params,
				},
			}
			c.JSON(http.StatusOK, resp)
			return
		}
		diagram.UpdateComponentMap(componentInfo.ID, componentMap)
	}

	if len(request.FreeVertexs) > 0 {
		for _, freeVertex := range request.FreeVertexs {
			graph.FreeVertexs[freeVertex] = struct{}{}
		}
	}

	// commit transaction
	tx.Commit()

	resp := network.SuccessResponse{
		Code: http.StatusOK,
		Msg:  "success",
		PayLoad: map[string]interface{}{
			"page_id": request.PageID,
		},
	}
	c.JSON(http.StatusOK, resp)
}