package repository

import (
	"time"

	"carrot_bbs/internal/model"

	"gorm.io/gorm"
)

// DeviceTokenRepository 设备Token仓储
type DeviceTokenRepository struct {
	db *gorm.DB
}

// NewDeviceTokenRepository 创建设备Token仓储
func NewDeviceTokenRepository(db *gorm.DB) *DeviceTokenRepository {
	return &DeviceTokenRepository{db: db}
}

// Create 创建设备Token
func (r *DeviceTokenRepository) Create(token *model.DeviceToken) error {
	return r.db.Create(token).Error
}

// GetByID 根据ID获取设备Token
func (r *DeviceTokenRepository) GetByID(id int64) (*model.DeviceToken, error) {
	var token model.DeviceToken
	err := r.db.First(&token, "id = ?", id).Error
	if err != nil {
		return nil, err
	}
	return &token, nil
}

// Update 更新设备Token
func (r *DeviceTokenRepository) Update(token *model.DeviceToken) error {
	return r.db.Save(token).Error
}

// Delete 删除设备Token（软删除）
func (r *DeviceTokenRepository) Delete(id int64) error {
	return r.db.Delete(&model.DeviceToken{}, id).Error
}

// GetByUserID 获取用户所有设备
// userID 参数为 string 类型（UUID格式），与JWT中user_id保持一致
func (r *DeviceTokenRepository) GetByUserID(userID string) ([]*model.DeviceToken, error) {
	var tokens []*model.DeviceToken
	err := r.db.Where("user_id = ?", userID).
		Order("created_at DESC").
		Find(&tokens).Error
	return tokens, err
}

// GetActiveByUserID 获取用户活跃设备
// userID 参数为 string 类型（UUID格式），与JWT中user_id保持一致
func (r *DeviceTokenRepository) GetActiveByUserID(userID string) ([]*model.DeviceToken, error) {
	var tokens []*model.DeviceToken
	err := r.db.Where("user_id = ? AND is_active = ?", userID, true).
		Order("last_used_at DESC").
		Find(&tokens).Error
	return tokens, err
}

// GetByDeviceID 根据设备ID获取设备Token
func (r *DeviceTokenRepository) GetByDeviceID(deviceID string) (*model.DeviceToken, error) {
	var token model.DeviceToken
	err := r.db.Where("device_id = ?", deviceID).First(&token).Error
	if err != nil {
		return nil, err
	}
	return &token, nil
}

// GetByPushToken 根据推送Token获取设备信息
func (r *DeviceTokenRepository) GetByPushToken(pushToken string) (*model.DeviceToken, error) {
	var token model.DeviceToken
	err := r.db.Where("push_token = ?", pushToken).First(&token).Error
	if err != nil {
		return nil, err
	}
	return &token, nil
}

// DeactivateAllExcept 登出其他设备（停用除指定设备外的所有设备）
func (r *DeviceTokenRepository) DeactivateAllExcept(userID int64, deviceID string) error {
	return r.db.Model(&model.DeviceToken{}).
		Where("user_id = ? AND device_id != ?", userID, deviceID).
		Update("is_active", false).Error
}

// Upsert 创建或更新设备Token
// 如果设备ID已存在，则更新Token和激活状态；否则创建新记录
func (r *DeviceTokenRepository) Upsert(token *model.DeviceToken) error {
	var existing model.DeviceToken
	err := r.db.Where("device_id = ?", token.DeviceID).First(&existing).Error

	if err == gorm.ErrRecordNotFound {
		// 创建新记录
		return r.db.Create(token).Error
	} else if err != nil {
		return err
	}

	// 更新现有记录
	return r.db.Model(&existing).Updates(map[string]interface{}{
		"push_token":   token.PushToken,
		"is_active":    true,
		"device_name":  token.DeviceName,
		"last_used_at": time.Now(),
	}).Error
}

// UpdateLastUsed 更新最后使用时间
func (r *DeviceTokenRepository) UpdateLastUsed(deviceID string) error {
	return r.db.Model(&model.DeviceToken{}).
		Where("device_id = ?", deviceID).
		Update("last_used_at", time.Now()).Error
}

// Deactivate 停用设备
func (r *DeviceTokenRepository) Deactivate(deviceID string) error {
	return r.db.Model(&model.DeviceToken{}).
		Where("device_id = ?", deviceID).
		Update("is_active", false).Error
}

// Activate 激活设备
func (r *DeviceTokenRepository) Activate(deviceID string) error {
	return r.db.Model(&model.DeviceToken{}).
		Where("device_id = ?", deviceID).
		Updates(map[string]interface{}{
			"is_active":    true,
			"last_used_at": time.Now(),
		}).Error
}

// DeleteByUserID 删除用户所有设备Token
func (r *DeviceTokenRepository) DeleteByUserID(userID int64) error {
	return r.db.Where("user_id = ?", userID).Delete(&model.DeviceToken{}).Error
}

// GetDeviceCountByUserID 获取用户设备数量
func (r *DeviceTokenRepository) GetDeviceCountByUserID(userID int64) (int64, error) {
	var count int64
	err := r.db.Model(&model.DeviceToken{}).
		Where("user_id = ?", userID).
		Count(&count).Error
	return count, err
}

// GetActiveDeviceCountByUserID 获取用户活跃设备数量
func (r *DeviceTokenRepository) GetActiveDeviceCountByUserID(userID int64) (int64, error) {
	var count int64
	err := r.db.Model(&model.DeviceToken{}).
		Where("user_id = ? AND is_active = ?", userID, true).
		Count(&count).Error
	return count, err
}

// DeleteInactiveDevices 删除长时间未使用的设备
func (r *DeviceTokenRepository) DeleteInactiveDevices(before time.Time) error {
	return r.db.Where("is_active = ? AND last_used_at < ?", false, before).
		Delete(&model.DeviceToken{}).Error
}