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

import (
	"fmt"
	"net/http"

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

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

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

	var request network.CircuitDiagramCreateRequest
	if err := c.ShouldBindJSON(&request); err != nil {
		logger.Error(c, "unmarshal circuit diagram create 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 topologicCreateInfos []network.TopologicUUIDCreateInfo
	for _, topologicLink := range request.TopologicLinks {
		var createInfo network.TopologicUUIDCreateInfo
		UUIDFrom, err1 := uuid.FromString(topologicLink.UUIDFrom)
		UUIDTo, err2 := uuid.FromString(topologicLink.UUIDTo)
		if err1 != nil || err2 != nil {
			var err error
			if err1 != nil && err2 == nil {
				err = fmt.Errorf("convert uuid from string failed:%w", err1)
			} else if err1 == nil && err2 != nil {
				err = fmt.Errorf("convert uuid from string failed:%w", err2)
			} else {
				err = fmt.Errorf("convert uuid from string failed:%w:%w", err1, err2)
			}

			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
		}
		createInfo.UUIDFrom = UUIDFrom
		createInfo.UUIDTo = UUIDTo
		topologicCreateInfos = append(topologicCreateInfos, createInfo)
	}

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

	err = database.CreateTopologicIntoDB(c, tx, request.PageID, topologicCreateInfos)
	if err != nil {
		tx.Rollback()

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

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

	for _, topologicCreateInfo := range topologicCreateInfos {
		graph.AddEdge(topologicCreateInfo.UUIDFrom, topologicCreateInfo.UUIDTo)
	}

	for index, componentInfo := range request.ComponentInfos {
		componentID, err := database.CreateComponentIntoDB(c, tx, componentInfo)
		if err != nil {
			tx.Rollback()

			logger.Error(c, "insert component info into DB failed", "error", err)

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

		err = database.CreateModelIntoDB(c, tx, componentID, componentInfo.ComponentType, componentInfo.Params)
		if err != nil {
			tx.Rollback()

			logger.Error(c, "create component model into DB failed", "component_infos", request.ComponentInfos, "error", err)

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

	for _, componentInfo := range request.ComponentInfos {
		paramsJSON, err := simplejson.NewJson([]byte(componentInfo.Params))
		if err != nil {
			tx.Rollback()

			logger.Error(c, "unmarshal component params info 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 {
			tx.Rollback()

			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.StoreComponentMap(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)
}