package repository

import (
	"context"
	"time"

	"with_you/internal/model"

	"gorm.io/gorm"
)

// SessionRepository 会话仓储接口
//
// 用于支持令牌撤销：登出/封禁按会话或用户撤销，refresh token 轮换按 hash 反查。
type SessionRepository interface {
	Create(ctx context.Context, session *model.Session) error
	GetByID(ctx context.Context, id string) (*model.Session, error)
	GetByRefreshTokenHash(ctx context.Context, hash string) (*model.Session, error)
	Update(ctx context.Context, session *model.Session) error
	Revoke(ctx context.Context, id string) error
	RevokeAllByUser(ctx context.Context, userID string) error
	RevokeByRefreshTokenHash(ctx context.Context, hash string) error
	DeleteExpired(ctx context.Context, before time.Time) error
}

type sessionRepository struct {
	db *gorm.DB
}

// NewSessionRepository 创建会话仓储。
func NewSessionRepository(db *gorm.DB) SessionRepository {
	return &sessionRepository{db: db}
}

func (r *sessionRepository) Create(ctx context.Context, session *model.Session) error {
	return r.db.WithContext(ctx).Create(session).Error
}

func (r *sessionRepository) GetByID(ctx context.Context, id string) (*model.Session, error) {
	var s model.Session
	if err := r.db.WithContext(ctx).Where("id = ?", id).First(&s).Error; err != nil {
		return nil, err
	}
	return &s, nil
}

func (r *sessionRepository) GetByRefreshTokenHash(ctx context.Context, hash string) (*model.Session, error) {
	var s model.Session
	if err := r.db.WithContext(ctx).Where("refresh_token_hash = ?", hash).First(&s).Error; err != nil {
		return nil, err
	}
	return &s, nil
}

func (r *sessionRepository) Update(ctx context.Context, session *model.Session) error {
	// 仅更新业务关心的列，避免 Save 全字段写回在并发 Rotate 下覆盖 RevokedAt 等字段造成 lost update。
	return r.db.WithContext(ctx).Model(&model.Session{}).
		Where("id = ?", session.ID).
		Updates(map[string]interface{}{
			"last_used_at":        session.LastUsedAt,
			"refresh_token_hash":  session.RefreshTokenHash,
		}).Error
}

func (r *sessionRepository) Revoke(ctx context.Context, id string) error {
	now := time.Now()
	return r.db.WithContext(ctx).Model(&model.Session{}).
		Where("id = ? AND revoked_at IS NULL", id).
		Update("revoked_at", now).Error
}

func (r *sessionRepository) RevokeAllByUser(ctx context.Context, userID string) error {
	now := time.Now()
	return r.db.WithContext(ctx).Model(&model.Session{}).
		Where("user_id = ? AND revoked_at IS NULL", userID).
		Update("revoked_at", now).Error
}

func (r *sessionRepository) RevokeByRefreshTokenHash(ctx context.Context, hash string) error {
	now := time.Now()
	return r.db.WithContext(ctx).Model(&model.Session{}).
		Where("refresh_token_hash = ? AND revoked_at IS NULL", hash).
		Update("revoked_at", now).Error
}

func (r *sessionRepository) DeleteExpired(ctx context.Context, before time.Time) error {
	return r.db.WithContext(ctx).
		Where("expires_at < ? OR revoked_at IS NOT NULL", before).
		Delete(&model.Session{}).Error
}