package postgres

import (
	"context"
	"database/sql"
	"fmt"
	"time"

	"github.com/google/uuid"
	"github.com/ocdp/cluster-service/internal/domain/entity"
	"github.com/ocdp/cluster-service/internal/domain/repository"
	"github.com/ocdp/cluster-service/internal/pkg/crypto"
)

// ClusterRepository PostgreSQL 集群仓储实现
type ClusterRepository struct {
	db        *DB
	encryptor crypto.Encryptor
}

// NewClusterRepository 创建 PostgreSQL 集群仓储
func NewClusterRepository(db *DB, encryptor crypto.Encryptor) repository.ClusterRepository {
	return &ClusterRepository{
		db:        db,
		encryptor: encryptor,
	}
}

// Create 创建集群
func (r *ClusterRepository) Create(ctx context.Context, cluster *entity.Cluster) error {
	if cluster.ID == "" {
		cluster.ID = uuid.New().String()
	}

	// 设置默认值
	if cluster.IsolationMode == "" {
		cluster.IsolationMode = entity.IsolationModeNamespace
	}

	// 加密敏感数据
	encryptedCAData, err := r.encryptor.Encrypt(cluster.CAData)
	if err != nil {
		return fmt.Errorf("failed to encrypt CA data: %w", err)
	}

	encryptedCertData, err := r.encryptor.Encrypt(cluster.CertData)
	if err != nil {
		return fmt.Errorf("failed to encrypt cert data: %w", err)
	}

	encryptedKeyData, err := r.encryptor.Encrypt(cluster.KeyData)
	if err != nil {
		return fmt.Errorf("failed to encrypt key data: %w", err)
	}

	encryptedToken, err := r.encryptor.Encrypt(cluster.Token)
	if err != nil {
		return fmt.Errorf("failed to encrypt token: %w", err)
	}

	query := `
		INSERT INTO clusters (id, workspace_id, owner_id, name, host, ca_data, cert_data, key_data, token, description, isolation_mode, default_namespace, is_shared, created_at, updated_at)
		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15)
	`

	_, err = r.db.conn.ExecContext(ctx, query,
		cluster.ID,
		cluster.WorkspaceID,
		cluster.OwnerID,
		cluster.Name,
		cluster.Host,
		encryptedCAData,
		encryptedCertData,
		encryptedKeyData,
		encryptedToken,
		cluster.Description,
		cluster.IsolationMode,
		cluster.DefaultNamespace,
		cluster.IsShared,
		cluster.CreatedAt,
		cluster.UpdatedAt,
	)

	if err != nil {
		return fmt.Errorf("failed to create cluster: %w", err)
	}

	return nil
}

// GetByID 根据 ID 获取集群
func (r *ClusterRepository) GetByID(ctx context.Context, id string) (*entity.Cluster, error) {
	query := `
		SELECT id, workspace_id, owner_id, name, host, ca_data, cert_data, key_data, token, description, isolation_mode, default_namespace, is_shared, created_at, updated_at
		FROM clusters
		WHERE id = $1
	`

	cluster := &entity.Cluster{}
	var encryptedCAData, encryptedCertData, encryptedKeyData, encryptedToken string

	err := r.db.conn.QueryRowContext(ctx, query, id).Scan(
		&cluster.ID,
		&cluster.WorkspaceID,
		&cluster.OwnerID,
		&cluster.Name,
		&cluster.Host,
		&encryptedCAData,
		&encryptedCertData,
		&encryptedKeyData,
		&encryptedToken,
		&cluster.Description,
		&cluster.IsolationMode,
		&cluster.DefaultNamespace,
		&cluster.IsShared,
		&cluster.CreatedAt,
		&cluster.UpdatedAt,
	)

	if err == sql.ErrNoRows {
		return nil, entity.ErrClusterNotFound
	}
	if err != nil {
		return nil, fmt.Errorf("failed to get cluster: %w", err)
	}

	// 解密敏感数据
	cluster.CAData, _ = r.encryptor.Decrypt(encryptedCAData)
	cluster.CertData, _ = r.encryptor.Decrypt(encryptedCertData)
	cluster.KeyData, _ = r.encryptor.Decrypt(encryptedKeyData)
	cluster.Token, _ = r.encryptor.Decrypt(encryptedToken)

	return cluster, nil
}

// GetByName 根据名称获取集群
func (r *ClusterRepository) GetByName(ctx context.Context, name string) (*entity.Cluster, error) {
	query := `
		SELECT id, workspace_id, owner_id, name, host, ca_data, cert_data, key_data, token, description, isolation_mode, default_namespace, is_shared, created_at, updated_at
		FROM clusters
		WHERE name = $1
	`

	cluster := &entity.Cluster{}
	var encryptedCAData, encryptedCertData, encryptedKeyData, encryptedToken string

	err := r.db.conn.QueryRowContext(ctx, query, name).Scan(
		&cluster.ID,
		&cluster.WorkspaceID,
		&cluster.OwnerID,
		&cluster.Name,
		&cluster.Host,
		&encryptedCAData,
		&encryptedCertData,
		&encryptedKeyData,
		&encryptedToken,
		&cluster.Description,
		&cluster.IsolationMode,
		&cluster.DefaultNamespace,
		&cluster.IsShared,
		&cluster.CreatedAt,
		&cluster.UpdatedAt,
	)

	if err == sql.ErrNoRows {
		return nil, entity.ErrClusterNotFound
	}
	if err != nil {
		return nil, fmt.Errorf("failed to get cluster: %w", err)
	}

	// 解密敏感数据
	cluster.CAData, _ = r.encryptor.Decrypt(encryptedCAData)
	cluster.CertData, _ = r.encryptor.Decrypt(encryptedCertData)
	cluster.KeyData, _ = r.encryptor.Decrypt(encryptedKeyData)
	cluster.Token, _ = r.encryptor.Decrypt(encryptedToken)

	return cluster, nil
}

// Update 更新集群
func (r *ClusterRepository) Update(ctx context.Context, cluster *entity.Cluster) error {
	cluster.UpdatedAt = time.Now()

	// 加密敏感数据
	encryptedCAData, err := r.encryptor.Encrypt(cluster.CAData)
	if err != nil {
		return fmt.Errorf("failed to encrypt CA data: %w", err)
	}

	encryptedCertData, err := r.encryptor.Encrypt(cluster.CertData)
	if err != nil {
		return fmt.Errorf("failed to encrypt cert data: %w", err)
	}

	encryptedKeyData, err := r.encryptor.Encrypt(cluster.KeyData)
	if err != nil {
		return fmt.Errorf("failed to encrypt key data: %w", err)
	}

	encryptedToken, err := r.encryptor.Encrypt(cluster.Token)
	if err != nil {
		return fmt.Errorf("failed to encrypt token: %w", err)
	}

	query := `
		UPDATE clusters
		SET name = $1, host = $2, ca_data = $3, cert_data = $4, key_data = $5,
		    token = $6, description = $7, isolation_mode = $8, default_namespace = $9,
		    is_shared = $10, updated_at = $11
		WHERE id = $12
	`

	result, err := r.db.conn.ExecContext(ctx, query,
		cluster.Name,
		cluster.Host,
		encryptedCAData,
		encryptedCertData,
		encryptedKeyData,
		encryptedToken,
		cluster.Description,
		cluster.IsolationMode,
		cluster.DefaultNamespace,
		cluster.IsShared,
		cluster.UpdatedAt,
		cluster.ID,
	)

	if err != nil {
		return fmt.Errorf("failed to update cluster: %w", err)
	}

	rows, err := result.RowsAffected()
	if err != nil {
		return fmt.Errorf("failed to get affected rows: %w", err)
	}

	if rows == 0 {
		return entity.ErrClusterNotFound
	}

	return nil
}

// Delete 删除集群
func (r *ClusterRepository) Delete(ctx context.Context, id string) error {
	query := `DELETE FROM clusters WHERE id = $1`

	result, err := r.db.conn.ExecContext(ctx, query, id)
	if err != nil {
		return fmt.Errorf("failed to delete cluster: %w", err)
	}

	rows, err := result.RowsAffected()
	if err != nil {
		return fmt.Errorf("failed to get affected rows: %w", err)
	}

	if rows == 0 {
		return entity.ErrClusterNotFound
	}

	return nil
}

// List 列出所有集群
func (r *ClusterRepository) List(ctx context.Context) ([]*entity.Cluster, error) {
	query := `
		SELECT id, workspace_id, owner_id, name, host, ca_data, cert_data, key_data, token, description, isolation_mode, default_namespace, is_shared, created_at, updated_at
		FROM clusters
		ORDER BY created_at DESC
	`

	rows, err := r.db.conn.QueryContext(ctx, query)
	if err != nil {
		return nil, fmt.Errorf("failed to list clusters: %w", err)
	}
	defer rows.Close()

	return r.scanClusters(rows)
}

// GetByWorkspace 获取 workspace 的所有集群（包括共享集群）
func (r *ClusterRepository) GetByWorkspace(ctx context.Context, workspaceID string) ([]*entity.Cluster, error) {
	query := `
		SELECT id, workspace_id, owner_id, name, host, ca_data, cert_data, key_data, token, description, isolation_mode, default_namespace, is_shared, created_at, updated_at
		FROM clusters
		WHERE workspace_id = $1 OR is_shared = TRUE
		ORDER BY is_shared, created_at DESC
	`

	rows, err := r.db.conn.QueryContext(ctx, query, workspaceID)
	if err != nil {
		return nil, fmt.Errorf("failed to list clusters by workspace: %w", err)
	}
	defer rows.Close()

	return r.scanClusters(rows)
}

// GetShared 获取所有共享集群
func (r *ClusterRepository) GetShared(ctx context.Context) ([]*entity.Cluster, error) {
	query := `
		SELECT id, workspace_id, owner_id, name, host, ca_data, cert_data, key_data, token, description, isolation_mode, default_namespace, is_shared, created_at, updated_at
		FROM clusters
		WHERE is_shared = TRUE
		ORDER BY created_at DESC
	`

	rows, err := r.db.conn.QueryContext(ctx, query)
	if err != nil {
		return nil, fmt.Errorf("failed to list shared clusters: %w", err)
	}
	defer rows.Close()

	return r.scanClusters(rows)
}

// scanClusters 扫描多行结果
func (r *ClusterRepository) scanClusters(rows *sql.Rows) ([]*entity.Cluster, error) {
	clusters := make([]*entity.Cluster, 0)
	for rows.Next() {
		cluster := &entity.Cluster{}
		var (
			encryptedCAData, encryptedCertData, encryptedKeyData, encryptedToken sql.NullString
			workspaceID, ownerID, defaultNamespace sql.NullString
		)

		err := rows.Scan(
			&cluster.ID,
			&workspaceID,
			&ownerID,
			&cluster.Name,
			&cluster.Host,
			&encryptedCAData,
			&encryptedCertData,
			&encryptedKeyData,
			&encryptedToken,
			&cluster.Description,
			&cluster.IsolationMode,
			&defaultNamespace,
			&cluster.IsShared,
			&cluster.CreatedAt,
			&cluster.UpdatedAt,
		)
		if err != nil {
			return nil, fmt.Errorf("failed to scan cluster: %w", err)
		}

		// 处理 NULL 值
		cluster.WorkspaceID = workspaceID.String
		cluster.OwnerID = ownerID.String
		cluster.DefaultNamespace = defaultNamespace.String

		// 解密敏感数据
		if encryptedCAData.Valid {
			cluster.CAData, _ = r.encryptor.Decrypt(encryptedCAData.String)
		}
		if encryptedCertData.Valid {
			cluster.CertData, _ = r.encryptor.Decrypt(encryptedCertData.String)
		}
		if encryptedKeyData.Valid {
			cluster.KeyData, _ = r.encryptor.Decrypt(encryptedKeyData.String)
		}
		if encryptedToken.Valid {
			cluster.Token, _ = r.encryptor.Decrypt(encryptedToken.String)
		}

		clusters = append(clusters, cluster)
	}

	if err := rows.Err(); err != nil {
		return nil, fmt.Errorf("rows iteration error: %w", err)
	}

	return clusters, nil
}