package service

import (
	"context"
	"fmt"
	"sync"

	"github.com/flipped-aurora/gin-vue-admin/server/global"
	"github.com/flipped-aurora/gin-vue-admin/server/plugin/monitor/model"
	"github.com/flipped-aurora/gin-vue-admin/server/plugin/monitor/model/request"
)

var (
	MonitorCache = make(map[string]map[string]bool) // 缓存结构: table -> field -> exists
	CacheMutex   sync.RWMutex
	ConfigList   = []model.MonitorConfig{}
)
var MonitorConfig = new(MC)

type MC struct{}

// CreateMonitorConfig 创建监控配置记录
// Author [yourname](https://github.com/yourname)
func (s *MC) CreateMonitorConfig(ctx context.Context, MC *model.MonitorConfig) (err error) {
	var num int64
	if MC.BusinessDB == nil {
		MC.BusinessDB = new(string)
	}
	err = global.GVA_DB.Model(&model.MonitorConfig{}).Where("business_db = ? AND database = ? AND db_table = ?", *MC.BusinessDB, *MC.Database, *MC.Table).Count(&num).Error
	if err != nil {
		return err
	}
	if num > 0 {
		return fmt.Errorf("当前【业务库%s-数据库%s-表名%s】已存在", *MC.BusinessDB, *MC.Database, *MC.Table)
	}

	err = global.GVA_DB.Create(MC).Error
	go s.InitMonitor()
	return err
}

// DeleteMonitorConfig 删除监控配置记录
// Author [yourname](https://github.com/yourname)
func (s *MC) DeleteMonitorConfig(ctx context.Context, ID string) (err error) {
	err = global.GVA_DB.Delete(&model.MonitorConfig{}, "id = ?", ID).Error
	return err
}

// DeleteMonitorConfigByIds 批量删除监控配置记录
// Author [yourname](https://github.com/yourname)
func (s *MC) DeleteMonitorConfigByIds(ctx context.Context, IDs []string) (err error) {
	err = global.GVA_DB.Delete(&[]model.MonitorConfig{}, "id in ?", IDs).Error
	return err
}

// UpdateMonitorConfig 更新监控配置记录
// Author [yourname](https://github.com/yourname)
func (s *MC) UpdateMonitorConfig(ctx context.Context, MC model.MonitorConfig) (err error) {
	var num int64
	if MC.BusinessDB == nil {
		MC.BusinessDB = new(string)
	}
	err = global.GVA_DB.Model(&model.MonitorConfig{}).Where("id <> ? AND business_db = ? AND database = ? AND db_table = ?", MC.ID, *MC.BusinessDB, *MC.Database, *MC.Table).Count(&num).Error
	if err != nil {
		return err
	}
	if num > 0 {
		return fmt.Errorf("当前【业务库%s-数据库%s-表名%s】已存在", *MC.BusinessDB, *MC.Database, *MC.Table)
	}
	err = global.GVA_DB.Model(&model.MonitorConfig{}).Debug().Where("id = ?", MC.ID).Updates(&MC).Error

	db := global.GVA_DB.Model(&model.MonitorConfig{}).Where("id = ?", MC.ID)
	// 如果开始时间/结束时间的字段为空，则强制更新为nil
	if MC.StartTime == nil {
		db.Updates(map[string]interface{}{"start_time": nil})
	}
	if MC.EndTime == nil {
		db.Updates(map[string]interface{}{"end_time": nil})
	}
	go s.InitMonitor()
	return err
}

// GetMonitorConfig 根据ID获取监控配置记录
// Author [yourname](https://github.com/yourname)
func (s *MC) GetMonitorConfig(ctx context.Context, ID string) (MC model.MonitorConfig, err error) {
	err = global.GVA_DB.Where("id = ?", ID).First(&MC).Error
	return
}

// GetMonitorConfigInfoList 分页获取监控配置记录
// Author [yourname](https://github.com/yourname)
func (s *MC) GetMonitorConfigInfoList(ctx context.Context, info request.MonitorConfigSearch) (list []model.MonitorConfig, total int64, err error) {
	limit := info.PageSize
	offset := info.PageSize * (info.Page - 1)
	// 创建db
	db := global.GVA_DB.Model(&model.MonitorConfig{})
	var MCs []model.MonitorConfig
	// 如果有条件搜索 下方会自动创建搜索语句
	if info.StartCreatedAt != nil && info.EndCreatedAt != nil {
		db = db.Where("created_at BETWEEN ? AND ?", info.StartCreatedAt, info.EndCreatedAt)
	}
	err = db.Count(&total).Error
	if err != nil {
		return
	}

	if limit != 0 {
		db = db.Limit(limit).Offset(offset)
	}
	err = db.Find(&MCs).Error
	return MCs, total, err
}

func (s *MC) GetMonitorConfigPublic(ctx context.Context) {

}

// 初始化监控配置
func (s *MC) InitMonitor() (err error) {
	var configs []model.MonitorConfig

	if err = global.GVA_DB.Find(&configs).Error; err != nil {
		return
	}
	s.refreshCache(configs)
	fmt.Println("configs refreshed success")
	ConfigList = configs
	return nil
}

func (s *MC) refreshCache(configs []model.MonitorConfig) {
	newCache := make(map[string]map[string]bool)
	for _, c := range configs {
		if c.IsEnable == nil || !*c.IsEnable {
			continue
		}
		if newCache[*c.Table] == nil {
			newCache[*c.Table] = make(map[string]bool)
		}
		for _, col := range c.Columns {
			if col != "" {
				newCache[*c.Table][col] = true
			}
		}
	}

	CacheMutex.Lock()
	MonitorCache = newCache
	CacheMutex.Unlock()
}

// IsFieldMonitored 检查字段是否被监控
func (s *MC) IsFieldMonitored(table, field string) bool {
	CacheMutex.RLock()
	defer CacheMutex.RUnlock()

	fields, ok := MonitorCache[table]
	if !ok {
		return false
	}
	return fields[field]
}

func (s *MC) RefreshExipre() (newExpire map[string]bool) {
	newExpire = make(map[string]bool)
	for _, c := range ConfigList {
		newExpire[*c.Table] = c.IsExpire()
	}
	fmt.Println("Expire refreshed success")
	return
}