package service

import (
	"errors"
	"fmt"
	"time"

	"github.com/flipped-aurora/gin-vue-admin/server/global"
	"github.com/flipped-aurora/gin-vue-admin/server/plugin/wechat-integration/model"
	"github.com/silenceper/wechat/v2"
	"github.com/silenceper/wechat/v2/cache"
	"github.com/silenceper/wechat/v2/officialaccount"
	"github.com/silenceper/wechat/v2/officialaccount/config"
	"gorm.io/gorm"
)

type MpUserService struct{}

// GetOfficialAccount 获取微信公众号实例
func (m *MpUserService) GetOfficialAccount() (*officialaccount.OfficialAccount, error) {
	// 从数据库获取微信公众号配置
	var mpConfig model.MpConfig
	err := global.GVA_DB.Where("config_type = ?", model.ConfigTypeMP).First(&mpConfig).Error
	if err != nil {
		return nil, fmt.Errorf("获取微信公众号配置失败: %v", err)
	}

	if mpConfig.AppID == "" || mpConfig.AppSecret == "" {
		return nil, errors.New("微信公众号配置不完整")
	}

	wc := wechat.NewWechat()
	memory := cache.NewMemory()
	cfg := &config.Config{
		AppID:     mpConfig.AppID,
		AppSecret: mpConfig.AppSecret,
		Cache:     memory,
	}

	// 如果有Token，设置服务器配置
	if mpConfig.Token != nil && *mpConfig.Token != "" {
		cfg.Token = *mpConfig.Token
	}

	return wc.GetOfficialAccount(cfg), nil
}

// SyncUser 同步微信用户信息
func (m *MpUserService) SyncUser(openid string) (*model.MpUser, error) {
	oa, err := m.GetOfficialAccount()
	if err != nil {
		return nil, err
	}

	// 从微信获取用户信息
	userInfo, err := oa.GetUser().GetUserInfo(openid)
	if err != nil {
		global.GVA_LOG.Error("获取微信用户信息失败: " + err.Error())
		return nil, err
	}

	// 查找或创建用户
	var user model.MpUser
	err = global.GVA_DB.Where("openid = ?", openid).First(&user).Error
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			// 创建新用户
			user = model.MpUser{
				OpenID:          userInfo.OpenID,
				SubscribeStatus: int(userInfo.Subscribe),
			}
			if userInfo.Nickname != "" {
				user.Nickname = &userInfo.Nickname
			}
			if userInfo.Headimgurl != "" {
				user.HeadImageURL = &userInfo.Headimgurl
			}
			if userInfo.Language != "" {
				user.Language = &userInfo.Language
			}
			if userInfo.Country != "" {
				user.Country = &userInfo.Country
			}
			if userInfo.Province != "" {
				user.Province = &userInfo.Province
			}
			if userInfo.City != "" {
				user.City = &userInfo.City
			}

			// 设置关注时间
			if userInfo.Subscribe == 1 && userInfo.SubscribeTime > 0 {
				subscribeTime := time.Unix(int64(userInfo.SubscribeTime), 0)
				user.SubscribeTime = &subscribeTime
			}

			// 设置 UnionID (仅用于记录，公众号不关联系统用户)
			if userInfo.UnionID != "" {
				user.UnionID = &userInfo.UnionID
				global.GVA_LOG.Info("公众号用户 UnionID: " + userInfo.UnionID)
			}

			err = global.GVA_DB.Create(&user).Error
			if err != nil {
				global.GVA_LOG.Error("创建微信公众号用户失败: " + err.Error())
				return nil, err
			}
		} else {
			global.GVA_LOG.Error("查询微信公众号用户失败: " + err.Error())
			return nil, err
		}
	} else {
		// 更新用户信息
		user.SubscribeStatus = int(userInfo.Subscribe)
		if userInfo.Nickname != "" {
			user.Nickname = &userInfo.Nickname
		}
		if userInfo.Headimgurl != "" {
			user.HeadImageURL = &userInfo.Headimgurl
		}
		if userInfo.Language != "" {
			user.Language = &userInfo.Language
		}
		if userInfo.Country != "" {
			user.Country = &userInfo.Country
		}
		if userInfo.Province != "" {
			user.Province = &userInfo.Province
		}
		if userInfo.City != "" {
			user.City = &userInfo.City
		}

		// 更新关注状态和时间
		if userInfo.Subscribe == 1 && userInfo.SubscribeTime > 0 {
			subscribeTime := time.Unix(int64(userInfo.SubscribeTime), 0)
			user.SubscribeTime = &subscribeTime
			user.UnsubscribeTime = nil
		} else if userInfo.Subscribe == 0 {
			now := time.Now()
			user.UnsubscribeTime = &now
		}

		// 如果还没有关联系统用户且有 unionid，尝试关联
		// 注意：这里需要根据实际业务需求决定是否需要重新关联

		err = global.GVA_DB.Save(&user).Error
		if err != nil {
			global.GVA_LOG.Error("更新微信公众号用户失败: " + err.Error())
			return nil, err
		}
	}

	return &user, nil
}

// GetUserByOpenID 根据 OpenID 获取用户
func (m *MpUserService) GetUserByOpenID(openid string) (*model.MpUser, error) {
	var user model.MpUser
	err := global.GVA_DB.Where("openid = ?", openid).First(&user).Error
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, errors.New("用户不存在")
		}
		return nil, err
	}
	return &user, nil
}

// GetUserList 获取用户列表
func (m *MpUserService) GetUserList(page, pageSize int, subscribeStatus *int) ([]model.MpUser, int64, error) {
	var users []model.MpUser
	var total int64

	db := global.GVA_DB.Model(&model.MpUser{})

	// 根据关注状态筛选
	if subscribeStatus != nil {
		db = db.Where("subscribe_status = ?", *subscribeStatus)
	}

	// 获取总数
	err := db.Count(&total).Error
	if err != nil {
		return nil, 0, err
	}

	// 分页查询
	offset := (page - 1) * pageSize
	err = db.Offset(offset).Limit(pageSize).Order("created_at desc").Find(&users).Error
	if err != nil {
		return nil, 0, err
	}

	return users, total, nil
}

// UpdateUserRemark 更新用户备注
func (m *MpUserService) UpdateUserRemark(openid, remark string) error {
	// 先更新微信服务器
	oa, err := m.GetOfficialAccount()
	if err != nil {
		return err
	}

	err = oa.GetUser().UpdateRemark(openid, remark)
	if err != nil {
		global.GVA_LOG.Error("更新微信用户备注失败: " + err.Error())
		return err
	}

	// 更新本地数据库
	err = global.GVA_DB.Model(&model.MpUser{}).Where("openid = ?", openid).Update("remark", remark).Error
	if err != nil {
		global.GVA_LOG.Error("更新本地用户备注失败: " + err.Error())
		return err
	}

	return nil
}

// SubscribeUser 用户关注事件处理
func (m *MpUserService) SubscribeUser(openid string) error {
	// 同步用户信息
	_, err := m.SyncUser(openid)
	if err != nil {
		return err
	}

	global.GVA_LOG.Info("用户关注: " + openid)
	return nil
}

// UnsubscribeUser 用户取消关注事件处理
func (m *MpUserService) UnsubscribeUser(openid string) error {
	now := time.Now()
	err := global.GVA_DB.Model(&model.MpUser{}).Where("openid = ?", openid).Updates(map[string]interface{}{
		"subscribe_status": 0,
		"unsubscribe_time": now,
	}).Error

	if err != nil {
		global.GVA_LOG.Error("处理用户取消关注失败: " + err.Error())
		return err
	}

	global.GVA_LOG.Info("用户取消关注: " + openid)
	return nil
}

// GetUserByUnionID 根据 UnionID 获取公众号用户信息 (仅用于查询，不关联系统用户)
func (m *MpUserService) GetUserByUnionID(unionid string) (*model.MpUser, error) {
	var user model.MpUser
	err := global.GVA_DB.Where("unionid = ?", unionid).First(&user).Error
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, errors.New("用户不存在")
		}
		return nil, err
	}
	return &user, nil
}