// Package database define database operation functions
package database

import (
	"context"
	"fmt"
	"time"

	"modelRT/constants"
	"modelRT/diagram"
	"modelRT/logger"
	"modelRT/orm"
	"modelRT/sql"

	"github.com/gofrs/uuid"
	"gorm.io/gorm"
	"gorm.io/gorm/clause"
)

// QueryTopologic return the topologic info of the circuit diagram
func QueryTopologic(ctx context.Context, tx *gorm.DB) ([]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, constants.UUIDNilStr).Scan(&topologics)
	if result.Error != nil {
		logger.Error(ctx, "query circuit diagram topologic info by start node uuid failed", "start_node_uuid", constants.UUIDNilStr, "error", result.Error)
		return nil, result.Error
	}
	return topologics, nil
}

// QueryTopologicFromDB return the result of query topologic info from DB
func QueryTopologicFromDB(ctx context.Context, tx *gorm.DB) (*diagram.MultiBranchTreeNode, error) {
	topologicInfos, err := QueryTopologic(ctx, tx)
	if err != nil {
		logger.Error(ctx, "query topologic info failed", "error", err)
		return nil, err
	}

	tree, err := BuildMultiBranchTree(topologicInfos)
	if err != nil {
		logger.Error(ctx, "init topologic failed", "error", err)
		return nil, err
	}
	return tree, nil
}

// InitCircuitDiagramTopologic return circuit diagram topologic info from postgres
func InitCircuitDiagramTopologic(topologicNodes []orm.Topologic) error {
	var rootVertex *diagram.MultiBranchTreeNode
	for _, node := range topologicNodes {
		if node.UUIDFrom == constants.UUIDNil {
			rootVertex = diagram.NewMultiBranchTree(node.UUIDFrom)
			break
		}
	}

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

	for _, node := range topologicNodes {
		if node.UUIDFrom == constants.UUIDNil {
			nodeVertex := diagram.NewMultiBranchTree(node.UUIDTo)
			rootVertex.AddChild(nodeVertex)
		}
	}

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

// TODO 电流互感器不单独划分间隔,以母线、浇筑母线、变压器为间隔原件
func IntervalBoundaryDetermine(uuid uuid.UUID) bool {
	diagram.GetComponentMap(uuid.String())
	// TODO 判断 component 的类型是否为间隔
	// TODO 0xA1B2C3D4,高四位表示可以成为间隔的compoent类型的值为FFFF,普通 component 类型的值为 0000。低四位中前二位表示component的一级类型，例如母线 PT、母联/母分、进线等，低四位中后二位表示一级类型中包含的具体类型，例如母线 PT中包含的电压互感器、隔离开关、接地开关、避雷器、带电显示器等。
	num := uint32(0xA1B2C3D4) // 八位16进制数
	high16 := uint16(num >> 16)
	fmt.Printf("原始值: 0x%X\n", num)     // 输出: 0xA1B2C3D4
	fmt.Printf("高十六位: 0x%X\n", high16) // 输出: 0xA1B2
	return true
}

// BuildMultiBranchTree return the multi branch tree by topologic info and component type map
func BuildMultiBranchTree(topologics []orm.Topologic) (*diagram.MultiBranchTreeNode, error) {
	nodeMap := make(map[uuid.UUID]*diagram.MultiBranchTreeNode, len(topologics)*2)

	for _, topo := range topologics {
		if _, exists := nodeMap[topo.UUIDFrom]; !exists {
			// skip special uuid
			if topo.UUIDTo != constants.UUIDNil {
				nodeMap[topo.UUIDFrom] = &diagram.MultiBranchTreeNode{
					ID:       topo.UUIDFrom,
					Children: make([]*diagram.MultiBranchTreeNode, 0),
				}
			}
		}

		if _, exists := nodeMap[topo.UUIDTo]; !exists {
			// skip special uuid
			if topo.UUIDTo != constants.UUIDNil {
				nodeMap[topo.UUIDTo] = &diagram.MultiBranchTreeNode{
					ID:       topo.UUIDTo,
					Children: make([]*diagram.MultiBranchTreeNode, 0),
				}
			}
		}
	}

	for _, topo := range topologics {
		var parent *diagram.MultiBranchTreeNode
		if topo.UUIDFrom == constants.UUIDNil {
			parent = &diagram.MultiBranchTreeNode{
				ID: constants.UUIDNil,
			}
			nodeMap[constants.UUIDNil] = parent
		} else {
			parent = nodeMap[topo.UUIDFrom]
		}

		var child *diagram.MultiBranchTreeNode
		if topo.UUIDTo == constants.UUIDNil {
			child = &diagram.MultiBranchTreeNode{
				ID: topo.UUIDTo,
			}
		} else {
			child = nodeMap[topo.UUIDTo]
		}
		child.Parent = parent
		parent.Children = append(parent.Children, child)
	}

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