package repository

import (
	"context"
	"errors"
	"fmt"

	"carrotskin/internal/model"

	"gorm.io/gorm"
)

// profileRepository ProfileRepository的实现
type profileRepository struct {
	db *gorm.DB
}

// NewProfileRepository 创建ProfileRepository实例
func NewProfileRepository(db *gorm.DB) ProfileRepository {
	return &profileRepository{db: db}
}

func (r *profileRepository) Create(ctx context.Context, profile *model.Profile) error {
	return r.db.WithContext(ctx).Create(profile).Error
}

func (r *profileRepository) FindByUUID(ctx context.Context, uuid string) (*model.Profile, error) {
	var profile model.Profile
	err := r.db.WithContext(ctx).Where("uuid = ?", uuid).
		Preload("Skin").
		Preload("Cape").
		First(&profile).Error
	if err != nil {
		return nil, err
	}
	return &profile, nil
}

func (r *profileRepository) FindByName(ctx context.Context, name string) (*model.Profile, error) {
	var profile model.Profile
	// 使用 LOWER 函数进行不区分大小写的查询，并预加载 Skin 和 Cape
	err := r.db.WithContext(ctx).Where("LOWER(name) = LOWER(?)", name).
		Preload("Skin").
		Preload("Cape").
		First(&profile).Error
	if err != nil {
		return nil, err
	}
	return &profile, nil
}

func (r *profileRepository) FindByUserID(ctx context.Context, userID int64) ([]*model.Profile, error) {
	var profiles []*model.Profile
	err := r.db.WithContext(ctx).Where("user_id = ?", userID).
		Preload("Skin").
		Preload("Cape").
		Order("created_at DESC").
		Find(&profiles).Error
	return profiles, err
}

func (r *profileRepository) FindByUUIDs(ctx context.Context, uuids []string) ([]*model.Profile, error) {
	if len(uuids) == 0 {
		return []*model.Profile{}, nil
	}
	var profiles []*model.Profile
	// 使用 IN 查询优化批量查询，并预加载关联
	err := r.db.WithContext(ctx).Where("uuid IN ?", uuids).
		Preload("Skin").
		Preload("Cape").
		Find(&profiles).Error
	return profiles, err
}

func (r *profileRepository) Update(ctx context.Context, profile *model.Profile) error {
	return r.db.WithContext(ctx).Save(profile).Error
}

func (r *profileRepository) UpdateFields(ctx context.Context, uuid string, updates map[string]interface{}) error {
	return r.db.WithContext(ctx).Model(&model.Profile{}).
		Where("uuid = ?", uuid).
		Updates(updates).Error
}

func (r *profileRepository) Delete(ctx context.Context, uuid string) error {
	return r.db.WithContext(ctx).Where("uuid = ?", uuid).Delete(&model.Profile{}).Error
}

func (r *profileRepository) BatchUpdate(ctx context.Context, uuids []string, updates map[string]interface{}) (int64, error) {
	if len(uuids) == 0 {
		return 0, nil
	}
	result := r.db.WithContext(ctx).Model(&model.Profile{}).Where("uuid IN ?", uuids).Updates(updates)
	return result.RowsAffected, result.Error
}

func (r *profileRepository) BatchDelete(ctx context.Context, uuids []string) (int64, error) {
	if len(uuids) == 0 {
		return 0, nil
	}
	result := r.db.WithContext(ctx).Where("uuid IN ?", uuids).Delete(&model.Profile{})
	return result.RowsAffected, result.Error
}

func (r *profileRepository) CountByUserID(ctx context.Context, userID int64) (int64, error) {
	var count int64
	err := r.db.WithContext(ctx).Model(&model.Profile{}).
		Where("user_id = ?", userID).
		Count(&count).Error
	return count, err
}

func (r *profileRepository) UpdateLastUsedAt(ctx context.Context, uuid string) error {
	return r.db.WithContext(ctx).Model(&model.Profile{}).
		Where("uuid = ?", uuid).
		Update("last_used_at", gorm.Expr("CURRENT_TIMESTAMP")).Error
}

func (r *profileRepository) GetByNames(ctx context.Context, names []string) ([]*model.Profile, error) {
	if len(names) == 0 {
		return []*model.Profile{}, nil
	}
	var profiles []*model.Profile
	// 与 FindByName 保持一致：使用 LOWER() 做大小写不敏感匹配，
	// 客户端按文档会 toLowerCase 规范化用户名后发送。
	err := r.db.WithContext(ctx).Where("LOWER(name) IN (?)", names).
		Preload("Skin").
		Preload("Cape").
		Find(&profiles).Error
	return profiles, err
}

func (r *profileRepository) GetKeyPair(ctx context.Context, profileId string) (*model.KeyPair, error) {
	if profileId == "" {
		return nil, errors.New("参数不能为空")
	}

	var profile model.Profile
	result := r.db.WithContext(ctx).
		Select("rsa_private_key", "rsa_public_key", "public_key_signature", "public_key_signature_v2", "key_expires_at", "key_refresh_at").
		Where("uuid = ?", profileId).
		First(&profile)

	if result.Error != nil {
		if errors.Is(result.Error, gorm.ErrRecordNotFound) {
			return nil, errors.New("key pair未找到")
		}
		return nil, fmt.Errorf("获取key pair失败: %w", result.Error)
	}

	keyPair := &model.KeyPair{
		PrivateKey:           profile.RSAPrivateKey,
		PublicKey:            profile.RSAPublicKey,
		PublicKeySignature:   profile.PublicKeySignature,
		PublicKeySignatureV2: profile.PublicKeySignatureV2,
	}
	if profile.KeyExpiresAt != nil {
		keyPair.Expiration = *profile.KeyExpiresAt
	}
	if profile.KeyRefreshAt != nil {
		keyPair.Refresh = *profile.KeyRefreshAt
	}
	return keyPair, nil
}

func (r *profileRepository) UpdateKeyPair(ctx context.Context, profileId string, keyPair *model.KeyPair) error {
	if profileId == "" {
		return errors.New("profileId 不能为空")
	}
	if keyPair == nil {
		return errors.New("keyPair 不能为 nil")
	}

	return r.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		result := tx.Model(&model.Profile{}).
			Where("uuid = ?", profileId).
			Updates(map[string]interface{}{
				"rsa_private_key":          keyPair.PrivateKey,
				"rsa_public_key":           keyPair.PublicKey,
				"public_key_signature":     keyPair.PublicKeySignature,
				"public_key_signature_v2":  keyPair.PublicKeySignatureV2,
				"key_expires_at":           keyPair.Expiration,
				"key_refresh_at":           keyPair.Refresh,
			})

		if result.Error != nil {
			return fmt.Errorf("更新 keyPair 失败: %w", result.Error)
		}
		return nil
	})
}