/**
 * @author chengliang
 * @date 2026/1/12 21:55
 * @brief
 *
 **/

package service

import (
	"dsbqj-admin/model/mongo/hotupdate"
	"dsbqj-admin/pkg/logger"
	"errors"
	"fmt"
	"strconv"
	"strings"
	"sync"

	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo/options"
)

var validProj = map[string]bool{
	"bzst": true,
	"ds20": true,
}

var validOs = map[string]bool{
	"ios":     true,
	"android": true,
}

type THotUpdateVerManager struct {
	mu         sync.RWMutex
	versionMap map[string]map[string]*TGetVersionRsp // proj:os:versionInfo
	versionDB  *hotupdate.TVersionDB
}

var (
	verManager *THotUpdateVerManager
	once       sync.Once
)

func GetTHotUpdateVerManager() *THotUpdateVerManager {
	once.Do(func() {
		verManager = &THotUpdateVerManager{
			versionMap: make(map[string]map[string]*TGetVersionRsp),
			versionDB:  hotupdate.NewVersionService(),
		}
	})
	return verManager
}

func (this *THotUpdateVerManager) Init() {

	for proj, _ := range validProj {
		for os, _ := range validOs {
			_, err := this.GetMaxPubVerInfo(proj, os)
			if err != nil {
				logger.Error(err.Error())
			}
		}
	}
	logger.Info("version manager init success, version info:%#v", this.versionMap)
}

func (this *THotUpdateVerManager) GetMaxPubVerInfo(proj, os string) (*TGetVersionRsp, error) {
	if proj == "" || os == "" {
		return nil, errors.New("project or os can't be empty")
	}
	if !validProj[proj] {
		return nil, fmt.Errorf("project:%s invalid", proj)
	}
	if !validOs[os] {
		return nil, fmt.Errorf("os:%s invalid", os)
	}

	if ver, err := this.getVersionMapBy(proj, os); err == nil {
		return ver, nil
	} else {
		versionRsp, err := this.findDBMaxPubVersion(proj, os)
		if err != nil {
			return nil, err
		}
		this.updateVersionMap(proj, os, versionRsp)
		return versionRsp, nil
	}
}

func (this *THotUpdateVerManager) reloadPubVerBy(proj, os string) error {
	versionRsp, err := this.findDBMaxPubVersion(proj, os)
	if err != nil {
		return err
	}
	this.updateVersionMap(proj, os, versionRsp)
	return nil
}

// 内部API调用
func (this *THotUpdateVerManager) GetMaxVerInfo(os string) (*TGetVersionRsp, error) {
	if os == "" {
		return nil, errors.New("project or os can't be empty")
	}
	return this.findDBMaxVersion("", os)
}

// 内部API调用
func (this *THotUpdateVerManager) AddVersion(req *TAddVersionReq) error {
	if !this.isInvalid(req) {
		return errors.New("version is invalid")
	}
	mVersion := &hotupdate.MVersionInfo{
		Proj:              req.Proj,
		Os:                req.Os,
		Version:           req.Version,
		PackageUrl:        req.PackageUrl,
		RemoteVersionUrl:  req.RemoteVersionUrl,
		RemoteManifestUrl: req.RemoteManifestUrl,
		Status:            hotupdate.DEF_VER_STATUS_NONE,
	}
	return this.versionDB.Create(mVersion)
}

func (this *THotUpdateVerManager) ChangeStatus(id string, status int16) (*TGetVersionRsp, error) {
	if id == "" {
		return nil, errors.New("id can't be empty")
	}
	if status != hotupdate.DEF_VER_STATUS_NONE && status != hotupdate.DEF_VER_STATUS_PUBLIC {
		return nil, fmt.Errorf("invalid status %d", status)
	}
	updateMap := make(map[string]interface{})
	updateMap["status"] = status
	mVersion, err := this.versionDB.Update(id, updateMap)
	if err != nil {
		return nil, err
	}
	logger.Info("after update mVersion", mVersion)
	err = this.reloadPubVerBy(mVersion.Proj, mVersion.Os)
	vRsp := &TGetVersionRsp{}
	if err != nil {
		logger.Warn(fmt.Errorf("reloadPubVerBy error: %v", err).Error())
	} else {
		vRsp.FromMVersion(mVersion)
	}
	return vRsp, nil
}

// 内部API调用 分页获取version list
func (this *THotUpdateVerManager) GetVersionList(start, limit int64) ([]*TGetVersionRsp, error) {
	opts := options.Find().
		SetSort(bson.M{"created_at": -1}). // 按版本降序
		SetSkip(start - 1).
		SetLimit(limit)

	dbVersionArr, err := this.versionDB.Find(nil, opts)
	if err != nil {
		return nil, err
	}
	rspArr := make([]*TGetVersionRsp, 0, len(dbVersionArr))
	for _, mVersion := range dbVersionArr {
		vRsp := &TGetVersionRsp{}
		vRsp.FromMVersion(&mVersion)
		rspArr = append(rspArr, vRsp)
	}
	return rspArr, nil
}

func (this *THotUpdateVerManager) getVersionMapBy(proj, os string) (*TGetVersionRsp, error) {
	this.mu.RLock()
	defer this.mu.RUnlock()
	if _, ok := this.versionMap[proj]; !ok {
		return nil, errors.New("project or os can't be empty")
	}
	if ver, ok := this.versionMap[proj][os]; ok {
		return ver, nil
	} else {
		return nil, errors.New("version not found")
	}
}

func (this *THotUpdateVerManager) updateVersionMap(proj, os string, versionRsp *TGetVersionRsp) {
	this.mu.Lock()
	defer this.mu.Unlock()
	logger.Info(fmt.Sprintf("updateVersionMap proj:%s, os:%s, ver:%s", proj, os, versionRsp.Version))
	if _, ok := this.versionMap[proj]; !ok {
		this.versionMap[proj] = make(map[string]*TGetVersionRsp)
	}
	logger.Info("before updateVersionMap %#v", this.versionMap[proj][os])
	this.versionMap[proj][os] = versionRsp
	logger.Info("after updateVersionMap %#v", this.versionMap[proj][os])
}

// 版本号是递增的
func (this *THotUpdateVerManager) isInvalid(req *TAddVersionReq) bool {
	curVersion, err := this.findDBMaxVersion(req.Proj, req.Os)
	if err != nil {
		// 默认只有系统初始化时
		return true
	}
	logger.Info("curVersion:%s, remoteVersion:%s", curVersion, req.Version)
	return CompareVersion(req.Version, curVersion.Version) == 1
}

// 对外的最大version
func (this *THotUpdateVerManager) findDBMaxPubVersion(proj, os string) (*TGetVersionRsp, error) {
	return this.findMaxVersionByStatus(proj, os, hotupdate.DEF_VER_STATUS_PUBLIC)
}

// 查找数据库中最大的version
func (this *THotUpdateVerManager) findDBMaxVersion(proj, os string) (*TGetVersionRsp, error) {
	if os == "" {
		return nil, errors.New("os can't be empty")
	}
	return this.findMaxVersionByStatus(proj, os, hotupdate.DEF_VER_STATUS_INVALID)
}

func (this *THotUpdateVerManager) findMaxVersionByStatus(proj, os string, status int16) (*TGetVersionRsp, error) {

	filte := bson.M{}
	if proj != "" {
		filte["project"] = proj
	}
	if os != "" {
		filte["os"] = os
	}
	if status == hotupdate.DEF_VER_STATUS_PUBLIC || status == hotupdate.DEF_VER_STATUS_NONE {
		filte["status"] = status
	}
	opts := options.Find().
		SetSort(bson.M{"created_at": -1})

	logger.Info("filte:%v", filte)
	versionArr, err := this.versionDB.Find(filte, opts)
	if err != nil {
		return nil, err
	}
	if len(versionArr) == 0 {
		return nil, fmt.Errorf("version not found proj:%s, os:%s, status:%d", proj, os, status)
	}
	mVersion := versionArr[0]
	versionRsp := &TGetVersionRsp{}
	versionRsp.FromMVersion(&mVersion)
	return versionRsp, nil
}

// CompareVersion 比较两个版本号
// 返回: -1(v1<v2), 0(v1=v2), 1(v1>v2)
func CompareVersion(v1, v2 string) int {
	// 将版本号按点号分割
	parts1 := strings.Split(v1, ".")
	parts2 := strings.Split(v2, ".")

	// 获取最大长度
	maxLen := len(parts1)
	if len(parts2) > maxLen {
		maxLen = len(parts2)
	}

	// 逐级比较
	for i := 0; i < maxLen; i++ {
		// 获取当前级别的版本号，如果不存在则为0
		num1 := 0
		if i < len(parts1) {
			num1, _ = strconv.Atoi(parts1[i])
		}

		num2 := 0
		if i < len(parts2) {
			num2, _ = strconv.Atoi(parts2[i])
		}

		// 比较当前级别
		if num1 < num2 {
			return -1
		} else if num1 > num2 {
			return 1
		}
		// 如果相等，继续比较下一级
	}

	return 0
}