// Package database define database operation functions
package database

import (
	"context"
	"fmt"
	"time"

	"modelRT/constant"
	"modelRT/diagram"
	"modelRT/orm"
	"modelRT/sql"

	"github.com/gofrs/uuid"
	"go.uber.org/zap"
	"gorm.io/gorm"
	"gorm.io/gorm/clause"
)

// QueryTopologic return the topologic info of the circuit diagram
func QueryTopologic(ctx context.Context, tx *gorm.DB, logger *zap.Logger) ([]orm.Topologic, error) {
	var topologics []orm.Topologic
	// ctx超时判断
	cancelCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
	defer cancel()

	result := tx.WithContext(cancelCtx).Clauses(clause.Locking{Strength: "UPDATE"}).Raw(sql.RecursiveSQL, constant.SpecialUUIDStr).Scan(&topologics)
	if result.Error != nil {
		logger.Error("query circuit diagram topologic info by start node uuid failed", zap.String("start_node_uuid", constant.SpecialUUIDStr), zap.Error(result.Error))
		return nil, result.Error
	}
	return topologics, nil
}

// TODO 电流互感器不单独划分间隔
// TODO 以母线、浇筑母线、变压器为间隔原件
// QueryTopologicFromDB return the result of query topologic info from DB
func QueryTopologicFromDB(ctx context.Context, tx *gorm.DB, logger *zap.Logger, componentTypeMap map[uuid.UUID]int) error {
	topologicInfos, err := QueryTopologic(ctx, tx, logger)
	if err != nil {
		logger.Error("query topologic info failed", zap.Error(err))
		return err
	}

	// err = InitCircuitDiagramTopologic(topologicInfos, componentTypeMap)
	// if err != nil {
	// 	logger.Error("init topologic failed", zap.Error(err))
	// 	return err
	// }

	_, err = BuildMultiBranchTree(topologicInfos, componentTypeMap)
	if err != nil {
		logger.Error("init topologic failed", zap.Error(err))
		return err
	}
	return nil
}

// InitCircuitDiagramTopologic return circuit diagram topologic info from postgres
func InitCircuitDiagramTopologic(topologicNodes []orm.Topologic, componentTypeMap map[uuid.UUID]int) error {
	var rootVertex *diagram.MultiBranchTreeNode
	for _, node := range topologicNodes {
		if node.UUIDFrom == constant.SpecialUUID {
			// rootVertex = node.UUIDTo
			var componentType int
			componentType, ok := componentTypeMap[node.UUIDFrom]
			if !ok {
				return fmt.Errorf("can not get component type by uuid: %s", node.UUIDFrom)
			}
			rootVertex = diagram.NewMultiBranchTree(node.UUIDFrom, componentType)
			break
		}
	}

	if rootVertex == nil {
		return fmt.Errorf("root vertex is nil")
	}

	for _, node := range topologicNodes {
		if node.UUIDFrom == constant.SpecialUUID {
			var componentType int
			componentType, ok := componentTypeMap[node.UUIDTo]
			if !ok {
				return fmt.Errorf("can not get component type by uuid: %s", node.UUIDTo)
			}
			nodeVertex := diagram.NewMultiBranchTree(node.UUIDTo, componentType)

			rootVertex.AddChild(nodeVertex)
		}
	}

	node := rootVertex
	for _, nodeVertex := range node.Children {
		nextVertexs := make([]*diagram.MultiBranchTreeNode, 0)
		nextVertexs = append(nextVertexs, nodeVertex)
	}
	return nil
}

func IntervalBoundaryDetermine(uuid uuid.UUID) bool {
	// TODO 从diagramsOverview中根据 uuid 获取 component 信息
	var componentID int64
	diagram.GetComponentMap(componentID)
	// TODO 判断 component 的类型是否为间隔
	return true
}

// BuildMultiBranchTree return the multi branch tree by topologic info and component type map
func BuildMultiBranchTree(topologics []orm.Topologic, componentTypeMap map[uuid.UUID]int) (*diagram.MultiBranchTreeNode, error) {
	nodeMap := make(map[uuid.UUID]*diagram.MultiBranchTreeNode, len(topologics))

	for _, topo := range topologics {
		// skip special uuid
		if topo.UUIDFrom != constant.SpecialUUID {
			if _, exists := nodeMap[topo.UUIDFrom]; !exists {
				componentType, ok := componentTypeMap[topo.UUIDFrom]
				if !ok {
					return nil, fmt.Errorf("can not get component type by uuid: %s", topo.UUIDFrom)
				}

				nodeMap[topo.UUIDFrom] = &diagram.MultiBranchTreeNode{
					ID:                topo.UUIDFrom,
					NodeComponentType: componentType,
				}
			}
		}

		if _, exists := nodeMap[topo.UUIDTo]; !exists {
			componentType, ok := componentTypeMap[topo.UUIDTo]
			if !ok {
				return nil, fmt.Errorf("can not get component type by uuid: %s", topo.UUIDTo)
			}

			nodeMap[topo.UUIDTo] = &diagram.MultiBranchTreeNode{
				ID:                topo.UUIDTo,
				NodeComponentType: componentType,
			}
		}
	}

	for _, topo := range topologics {
		var parent *diagram.MultiBranchTreeNode
		if topo.UUIDFrom == constant.SpecialUUID {
			componentType, ok := componentTypeMap[topo.UUIDTo]
			if !ok {
				return nil, fmt.Errorf("can not get component type by uuid: %s", topo.UUIDTo)
			}

			parent = &diagram.MultiBranchTreeNode{
				ID:                constant.SpecialUUID,
				NodeComponentType: componentType,
			}
			nodeMap[constant.SpecialUUID] = parent
		} else {
			parent = nodeMap[topo.UUIDFrom]
		}

		child := nodeMap[topo.UUIDTo]
		child.Parent = parent
		parent.Children = append(parent.Children, child)
	}

	// return root vertex
	root, exists := nodeMap[constant.SpecialUUID]
	if !exists {
		return nil, fmt.Errorf("root node not found")
	}
	return root, nil
}