package service

import (
	"context"
	"errors"
	"fmt"
	"sort"
	"strconv"
	"strings"
	"time"

	"dsbqj-admin/app/task"
	"dsbqj-admin/model/mongo/abver"
	"dsbqj-admin/model/mongo/md5"
	"dsbqj-admin/model/mongo/version"
	"dsbqj-admin/tool"

	"github.com/kamva/mgm/v3"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/bson/primitive"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
)

const versionExternalReqTimeoutSec = 30 * 60

type VersionReloadService struct {
}

func (service *VersionReloadService) Reload() error {
	task.VersionTask.Exec()
	return nil
}

type VersionServerService struct {
	Platform      string `json:"platform"`
	LegacyChannel string `json:"channel"`
}

func (service *VersionServerService) Servers() ([]*version.Version, error) {
	platform := resolvePlatform(service.Platform, service.LegacyChannel)
	if platform == "" {
		return nil, errors.New("平台不能为空")
	}
	items := task.VersionTask.Servers(platform)
	result := make([]*version.Version, 0, len(items))
	for _, item := range items {
		result = append(result, versionWithConfig(item, platform, task.NormalizeEnvVersion(item.EnvVersion)))
	}
	return result, nil
}

type VersionCheckService struct {
	Version       string `json:"version"`
	Platform      string `json:"platform"`
	LegacyChannel string `json:"channel"`
	EnvVersion    string `json:"envVersion"`
}

func (service *VersionCheckService) Check() (*version.Version, error) {
	platform := resolvePlatform(service.Platform, service.LegacyChannel)
	if platform == "" {
		return nil, errors.New("平台不能为空")
	}
	result := task.VersionTask.Check(service.Version, platform, service.EnvVersion)
	if result == nil {
		return nil, nil
	}
	return versionWithConfig(result, platform, task.NormalizeEnvVersion(result.EnvVersion)), nil
}

func versionWithConfig(item *version.Version, platform, env string) *version.Version {
	result := *item
	abVer := task.VersionConfigTask.GetAbVer(platform, env)
	md5 := task.VersionConfigTask.GetMD5(platform, env)
	result.AbVer, result.AbVerVersion = abVer.Value, abVer.Version
	result.MD5, result.MD5Version = md5.Value, md5.Version
	return &result
}

func resolvePlatform(platform, legacyChannel string) string {
	if value := strings.TrimSpace(platform); value != "" {
		return value
	}
	return strings.TrimSpace(legacyChannel)
}

type VersionShowService struct {
	CondPage
	Platform   string `form:"platform" json:"platform"`
	EnvVersion string `form:"envVersion" json:"envVersion"`
}

func (service *VersionShowService) List() ([]version.Version, error) {
	versions := make([]version.Version, 0)
	var queryDoc = bson.M{}
	clauses := make([]bson.M, 0, 2)
	if service.Platform != "" {
		clauses = append(clauses, bson.M{"$or": []bson.M{{"platform": service.Platform}, {"platform": ""}, {"platform": bson.M{"$exists": false}}}})
	}
	if service.EnvVersion != "" {
		envVersion := task.NormalizeEnvVersion(service.EnvVersion)
		if envVersion == "release" {
			clauses = append(clauses, bson.M{"$or": []bson.M{
				{"envVersion": envVersion},
				{"envVersion": ""},
				{"envVersion": bson.M{"$exists": false}},
			}})
		} else {
			clauses = append(clauses, bson.M{"envVersion": envVersion})
		}
	}
	if len(clauses) > 0 {
		queryDoc["$and"] = clauses
	}

	err := mgm.Coll(&version.Version{}).SimpleFind(&versions, queryDoc)
	return versions, err
}

type VersionCreateService struct {
	Platform   string `json:"platform" binding:"required"`
	EnvVersion string `json:"envVersion"`
	Version    string `json:"version" binding:"required"`
	Name       string `json:"name" binding:"required"`
	CDN        string `json:"cdn" binding:"required"`
	Url        string `json:"url" binding:"required"`
}

func (service *VersionCreateService) Create() error {
	envVersion := task.NormalizeEnvVersion(service.EnvVersion)
	var exists version.Version
	err := mgm.Coll(&version.Version{}).First(versionIdentityFilter(service.Platform, service.Version, envVersion), &exists)
	if err == nil {
		return errors.New("该平台、环境和版本号已存在")
	}
	if !errors.Is(err, mongo.ErrNoDocuments) {
		return err
	}
	version := new(version.Version)
	version.Platform = service.Platform
	version.EnvVersion = envVersion
	version.Name = service.Name
	version.Version = service.Version
	version.CDN = service.CDN
	version.Url = service.Url

	if err := mgm.Coll(version).Create(version); err != nil {
		return err
	}
	task.VersionTask.Exec()
	return nil
}

type VersionEditService struct {
	Id         string  `json:"id" binding:"required"`
	Platform   *string `json:"platform"`
	EnvVersion *string `json:"envVersion"`
	Version    *string `json:"version"`
	Name       *string `json:"name"`
	CDN        *string `json:"cdn"`
	Url        *string `json:"url"`
	Default    *bool   `json:"default"`
}

func (service *VersionEditService) Edit() error {
	objectId, _ := primitive.ObjectIDFromHex(service.Id)
	coll := mgm.Coll(&version.Version{})
	var current version.Version
	if err := coll.FindByID(objectId, &current); err != nil {
		return err
	}
	platform, envVersion, versionNumber := current.Platform, task.NormalizeEnvVersion(current.EnvVersion), current.Version
	if service.Platform != nil {
		platform = strings.TrimSpace(*service.Platform)
	}
	if service.EnvVersion != nil {
		envVersion = task.NormalizeEnvVersion(*service.EnvVersion)
	}
	if service.Version != nil {
		versionNumber = *service.Version
	}
	var duplicate version.Version
	duplicateFilter := versionIdentityFilter(platform, versionNumber, envVersion)
	duplicateFilter["_id"] = bson.M{"$ne": objectId}
	if err := coll.First(duplicateFilter, &duplicate); err == nil {
		return errors.New("该平台、环境和版本号已存在")
	} else if !errors.Is(err, mongo.ErrNoDocuments) {
		return err
	}

	filterDoc := bson.M{"_id": objectId}
	updateDoc := bson.M{}
	if service.Platform != nil {
		updateDoc["platform"] = platform
	}
	if service.EnvVersion != nil {
		updateDoc["envVersion"] = task.NormalizeEnvVersion(*service.EnvVersion)
	}
	if service.Name != nil {
		updateDoc["name"] = *service.Name
	}
	if service.Version != nil {
		updateDoc["version"] = *service.Version
	}
	if service.CDN != nil {
		updateDoc["cdn"] = *service.CDN
	}
	if service.Url != nil {
		updateDoc["url"] = *service.Url
	}
	if service.Default != nil {
		updateDoc["default"] = *service.Default
	}

	_, err := coll.UpdateOne(context.Background(), filterDoc, bson.M{"$set": updateDoc})
	if err != nil {
		return err
	}
	task.VersionTask.Exec()
	return nil
}

func versionIdentityFilter(platform, versionNumber, envVersion string) bson.M {
	filter := bson.M{"platform": platform, "version": versionNumber}
	if task.NormalizeEnvVersion(envVersion) == "release" {
		filter["$or"] = []bson.M{{"envVersion": "release"}, {"envVersion": ""}, {"envVersion": bson.M{"$exists": false}}}
	} else {
		filter["envVersion"] = "trial"
	}
	return filter
}

type VersionProdService struct {
	Id     string `json:"id" binding:"required"`
	IsProd bool   `json:"isProd"`
}

func (service *VersionProdService) Update() error {
	objectId, err := primitive.ObjectIDFromHex(service.Id)
	if err != nil {
		return err
	}

	coll := mgm.Coll(&version.Version{})
	var current version.Version
	if err := coll.FindByID(objectId, &current); err != nil {
		return err
	}

	if service.IsProd {
		scope := versionIdentityFilter(current.Platform, "", current.EnvVersion)
		delete(scope, "version")
		scope["_id"] = bson.M{"$ne": objectId}
		if _, err := coll.UpdateMany(
			context.Background(),
			scope,
			bson.M{"$set": bson.M{"isProd": false}},
		); err != nil {
			return err
		}
	}

	_, err = coll.UpdateOne(
		context.Background(),
		bson.M{"_id": objectId},
		bson.M{"$set": bson.M{"isProd": service.IsProd}},
	)
	return err
}

type VersionExternalConfigService struct {
	Platform string  `form:"platform" json:"platform" binding:"required"`
	Version  string  `form:"version" json:"version" binding:"required"`
	AbVer    *string `form:"abVer" json:"abVer"`
	MD5      *string `form:"md5" json:"md5"`
	TimeSec  int64   `form:"timesec" json:"timesec" binding:"required"`
	Sign     string  `form:"sign" json:"sign" binding:"required"`
}

type VersionConfigUploadService struct {
	Platform string `form:"platform" json:"platform" binding:"required"`
	Version  string `form:"version" json:"version" binding:"required"`
	Value    string `form:"value" json:"value" binding:"required"`
	TimeSec  int64  `form:"timesec" json:"timesec" binding:"required"`
	Sign     string `form:"sign" json:"sign" binding:"required"`
}

type VersionConfigManageService struct {
	Type           string    `json:"type" form:"type" binding:"required"`
	ID             string    `json:"id"`
	PlatformFilter string    `json:"-"`
	Version        string    `json:"version"`
	Value          *string   `json:"value"`
	EnvVersions    *[]string `json:"envVersions"`
	External       *bool     `json:"external"`
}

func configCollection(configType string) interface{} {
	if configType == "md5" {
		return &md5.MD5{}
	}
	return &abver.AbVer{}
}

func (service *VersionConfigManageService) List() (interface{}, error) {
	items := make([]interface{}, 0)
	filter := bson.M{}
	if service.PlatformFilter != "" {
		filter["$or"] = []bson.M{{"platform": service.PlatformFilter}, {"platform": ""}, {"platform": bson.M{"$exists": false}}}
	}
	if service.Type == "md5" {
		result := make([]md5.MD5, 0)
		err := mgm.Coll(&md5.MD5{}).SimpleFind(&result, filter)
		sort.SliceStable(result, func(i, j int) bool {
			return task.CompareConfigVersion(result[i].Version, result[j].Version) > 0
		})
		for i := range result {
			items = append(items, result[i])
		}
		return items, err
	}
	result := make([]abver.AbVer, 0)
	err := mgm.Coll(&abver.AbVer{}).SimpleFind(&result, filter)
	sort.SliceStable(result, func(i, j int) bool {
		return task.CompareConfigVersion(result[i].Version, result[j].Version) > 0
	})
	for i := range result {
		items = append(items, result[i])
	}
	return items, err
}

func (service *VersionConfigManageService) Save() error {
	if service.ID == "" {
		return errors.New("配置记录编号不能为空")
	}
	id, err := primitive.ObjectIDFromHex(service.ID)
	if err != nil {
		return err
	}
	update := bson.M{}
	if service.Value != nil {
		update["value"] = *service.Value
	}
	if service.EnvVersions != nil {
		update["envVersions"] = *service.EnvVersions
	}
	if service.External != nil {
		update["external"] = *service.External
	}
	if len(update) == 0 {
		return errors.New("没有需要更新的内容")
	}
	if service.Type == "md5" {
		_, err = mgm.Coll(&md5.MD5{}).UpdateOne(context.Background(), bson.M{"_id": id}, bson.M{"$set": update})
		if err == nil {
			task.VersionConfigTask.Reload()
		}
		return err
	}
	_, err = mgm.Coll(&abver.AbVer{}).UpdateOne(context.Background(), bson.M{"_id": id}, bson.M{"$set": update})
	if err == nil {
		task.VersionConfigTask.Reload()
	}
	return err
}

func (service *VersionConfigUploadService) ValidateAuth() error {
	deltaTime := time.Now().Unix() - service.TimeSec
	if deltaTime < 0 {
		deltaTime = -deltaTime
	}
	if deltaTime > versionExternalReqTimeoutSec {
		return errors.New("时间戳已过期")
	}
	params := map[string]any{"platform": service.Platform, "version": service.Version, "value": service.Value, "timesec": strconv.FormatInt(service.TimeSec, 10)}
	if tool.GenSign(params) != service.Sign {
		return errors.New("签名错误")
	}
	return nil
}

func (service *VersionConfigUploadService) SaveAbVer() error {
	var exists abver.AbVer
	filter := bson.M{"platform": service.Platform, "version": service.Version}
	if err := mgm.Coll(&abver.AbVer{}).First(filter, &exists); err == nil {
		return errors.New("abVer 配置版本已存在，不能重复上报")
	}
	item := &abver.AbVer{Platform: service.Platform, Version: service.Version, Value: service.Value, External: false}
	_, err := mgm.Coll(item).UpdateOne(context.Background(), filter, bson.M{"$set": item}, options.Update().SetUpsert(true))
	if err == nil {
		task.VersionConfigTask.Reload()
	}
	return err
}

func (service *VersionConfigUploadService) SaveMD5() error {
	var exists md5.MD5
	filter := bson.M{"platform": service.Platform, "version": service.Version}
	if err := mgm.Coll(&md5.MD5{}).First(filter, &exists); err == nil {
		return errors.New("md5 配置版本已存在，不能重复上报")
	}
	item := &md5.MD5{Platform: service.Platform, Version: service.Version, Value: service.Value, External: false}
	_, err := mgm.Coll(item).UpdateOne(context.Background(), filter, bson.M{"$set": item}, options.Update().SetUpsert(true))
	if err == nil {
		task.VersionConfigTask.Reload()
	}
	return err
}

func (service *VersionExternalConfigService) Save() error {
	if service.AbVer == nil && service.MD5 == nil {
		return errors.New("abVer or md5 is required")
	}

	filterDoc := bson.M{
		"platform": service.Platform,
		"version":  service.Version,
	}

	coll := mgm.Coll(&version.Version{})
	var current version.Version
	if err := coll.First(filterDoc, &current); err != nil {
		return errors.New("version not found")
	}
	updateDoc := bson.M{}
	if service.AbVer != nil {
		updateDoc["abVer"] = *service.AbVer
	}
	if service.MD5 != nil {
		updateDoc["md5"] = *service.MD5
	}

	_, err := coll.UpdateOne(
		context.Background(),
		bson.M{"_id": current.ID},
		bson.M{"$set": updateDoc},
	)
	return err
}

func (service *VersionExternalConfigService) ValidateAuth() error {
	deltaTime := time.Now().Unix() - service.TimeSec
	if deltaTime < 0 {
		deltaTime = -deltaTime
	}
	if deltaTime > versionExternalReqTimeoutSec {
		return fmt.Errorf("timesec timeout")
	}

	params := map[string]any{
		"platform": service.Platform,
		"version":  service.Version,
		"timesec":  strconv.FormatInt(service.TimeSec, 10),
	}
	if service.AbVer != nil {
		params["abVer"] = *service.AbVer
	}
	if service.MD5 != nil {
		params["md5"] = *service.MD5
	}

	sign := tool.GenSign(params)
	if sign != service.Sign {
		return fmt.Errorf("sign error")
	}
	return nil
}

type VersionDeleteService struct {
	Id string `json:"id" binding:"required"`
}

func (service *VersionDeleteService) Delete() error {
	version := new(version.Version)
	objectId, _ := primitive.ObjectIDFromHex(service.Id)
	filterDoc := bson.M{"_id": objectId}

	_, err := mgm.Coll(version).DeleteOne(context.Background(), filterDoc)
	if err != nil {
		return err
	}
	task.VersionTask.Exec()
	return nil
}