package actions

import (
	"fmt"
	"log/slog"
	"time"
	"zzman/clients/jd"
	"zzman/model"
	u "zzman/util"

	"gorm.io/gorm"
)

type UpdateArgs struct {
	Mock bool
}

func Update(args ...UpdateArgs) error {
	var arg UpdateArgs
	if len(args) > 0 {
		arg = args[0]
	} else {
		arg.Mock = false
	}

	return model.DB.Transaction(func(tx *gorm.DB) error {
		return update(tx, arg)
	})
}

func update(tx *gorm.DB, arg UpdateArgs) error {
	var now = time.Now()
	var step = now

	// 获取所有网关
	gateways, err := FindGateways(tx)
	if err != nil {
		return fmt.Errorf("获取所有网关失败：%w", err)
	}
	var findGateway = make(map[string]model.Gateway)
	for _, gateway := range gateways {
		findGateway[gateway.Macaddr] = gateway
	}

	println(fmt.Sprintf("获取网关：%v", time.Since(step)))
	step = time.Now()

	// 获取所有城市
	cities, err := FindCitiesWithEdgesCount(tx)
	if err != nil {
		return fmt.Errorf("获取所有城市失败：%w", err)
	}
	var findCity = make(map[string]model.City)
	for _, city := range cities {
		findCity[city.Hash] = city
	}

	println(fmt.Sprintf("获取城市：%v", time.Since(step)))
	step = time.Now()

	// 获取所有配置
	configs, err := FindConfigs(tx)
	if err != nil {
		return fmt.Errorf("获取所有配置失败：%w", err)
	}
	var findConfig = make(map[string]model.Config)
	for _, config := range configs {
		findConfig[config.Cityhash+":"+config.GatewayMac] = config
	}

	println(fmt.Sprintf("获取配置：%v", time.Since(step)))
	step = time.Now()

	// 更新网关配置
	var newConfigs = make(map[model.Gateway][]ConfigInfo)
	var changes []model.Change

	for _, city := range cities {

		// 先处理不变更的节点
		configsUpdate := make([]model.Config, 0)
		for _, gateway := range gateways {
			oldConfig, exists := findConfig[city.Hash+":"+gateway.Macaddr]
			if exists && oldConfig.IsChange != 1 {
				newConfigs[gateway] = append(newConfigs[gateway], ConfigInfo{
					Change: false,
					Remote: jd.EdgeInfo{
						Mac:  oldConfig.Macaddr,
						City: oldConfig.Cityhash,
					},
				})
			} else {
				configsUpdate = append(configsUpdate, oldConfig)
			}
		}
		count := len(configsUpdate)
		if len(configsUpdate) == 0 {
			continue
		}

		// 如果有需要变更的节点，获取足量新节点
		offset := city.Offset
		if count > city.EdgesCount {
			slog.Warn(fmt.Sprintf("城市节点数量不足，跳过本次更新，城市：%s，节点数：%d，网关数：%d", city.Name, city.EdgesCount, count))
			continue
		}

		edges, err := SliceActiveEdges(tx, city.Id, offset, count)
		if err != nil {
			return fmt.Errorf("查询城市 %s 可用节点失败：%w", city.Name, err)
		}
		if len(edges) < count {
			slog.Debug(fmt.Sprintf("城市节点不足，将循环使用节点，城市：%s，节点数：%d，网关数：%d", city.Name, city.EdgesCount, count))
			edges, err = SliceActiveEdges(tx, city.Id, 0, count)
			if err != nil {
				return fmt.Errorf("查询城市 %s 可用节点失败：%w", city.Name, err)
			}
		}

		city.Offset = edges[len(edges)-1].Id

		// 分配新节点
		for i, oldConfig := range configsUpdate {

			gateway := findGateway[oldConfig.GatewayMac]
			edge := edges[i]

			slog.Debug(fmt.Sprintf("网关配置变更，网关：%s，旧节点：%s，新节点：%s", gateway.Macaddr, oldConfig.Macaddr, edge.Macaddr))

			newConfigs[gateway] = append(newConfigs[gateway], ConfigInfo{
				Change: true,
				Remote: jd.EdgeInfo{
					City: city.Hash,
					Mac:  edge.Macaddr,
				},
				Config: model.ConfigUpdate{
					Id:       oldConfig.Id,
					Macaddr:  u.P(edge.Macaddr),
					IsChange: u.P(0),
					IsOnline: u.P(1),
				},
			})
			changes = append(changes, model.Change{
				Time:    now,
				CityId:  city.Id,
				Gateway: gateway.Macaddr,
				OldEdge: oldConfig.Macaddr,
				NewEdge: edge.Macaddr,
			})
		}
	}

	println(fmt.Sprintf("循环分配：%v", time.Since(step)))
	step = time.Now()

	// 更新城市偏移量
	err = UpdateCitiesOffset(tx, cities)
	if err != nil {
		return fmt.Errorf("更新城市偏移量失败：%w", err)
	}

	println(fmt.Sprintf("更新城市偏移量：%v", time.Since(step)))
	step = time.Now()

	// 记录节点变更
	err = RecordChanges(tx, changes)
	if err != nil {
		return fmt.Errorf("记录节点变更失败：%w", err)
	}

	println(fmt.Sprintf("记录节点变更：%v", time.Since(step)))
	step = time.Now()

	// 提交所有网关配置到云端
	for gateway, infos := range newConfigs {
		edges := make([]jd.EdgeInfo, len(infos))
		configsUpdate := make([]model.ConfigUpdate, 0)

		// 统计变更数
		change := 0
		for i, info := range infos {
			edges[i] = info.Remote
			if info.Change {
				configsUpdate = append(configsUpdate, info.Config)
				change++
			}
		}
		slog.Info(fmt.Sprintf("提交网关配置，网关：%s，变更数：%d", gateway.Macaddr, change))

		// 更新配置版本
		err = AppendGatewayConfigVersion(tx, gateway.Id)
		if err != nil {
			return fmt.Errorf("更新网关 %s 配置版本失败：%w", gateway.Macaddr, err)
		}

		// 更新本地配置
		err = UpdateConfigs(tx, configsUpdate)
		if err != nil {
			return fmt.Errorf("更新网关 %s 本地配置失败：%w", gateway.Macaddr, err)
		}

		// 提交配置到云端：配置版本 gateway.ConfigVersion
		if !arg.Mock {
			err := jd.GatewayConfigSet(gateway.ConfigVersion, gateway.Macaddr, edges)
			if err != nil {
				return fmt.Errorf("配置网关 %s 失败：%w", gateway.Macaddr, err)
			}
		}
	}

	println(fmt.Sprintf("提交配置：%v", time.Since(step)))

	println(fmt.Sprintf("总耗时：%v", time.Since(now)))
	return nil
}

type ConfigInfo struct {
	Change bool
	Remote jd.EdgeInfo
	Config model.ConfigUpdate
}