package postgres

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

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

// InstanceRepository PostgreSQL 实例仓储实现
type InstanceRepository struct {
	db *DB
}

// NewInstanceRepository 创建 PostgreSQL 实例仓储
func NewInstanceRepository(db *DB) repository.InstanceRepository {
	return &InstanceRepository{db: db}
}

// Create 创建实例
func (r *InstanceRepository) Create(ctx context.Context, instance *entity.Instance) error {
	if instance.ID == "" {
		instance.ID = uuid.New().String()
	}

	// 将 Values 转换为 JSON
	valuesJSON, err := json.Marshal(instance.Values)
	if err != nil {
		return fmt.Errorf("failed to marshal values: %w", err)
	}

	query := `
		INSERT INTO instances (id, cluster_id, name, namespace, registry_id, repository, chart, version, 
		                       description, values, values_yaml, status, status_reason, last_operation, last_error,
		                       revision, created_at, updated_at)
		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18)
	`

	_, err = r.db.conn.ExecContext(ctx, query,
		instance.ID,
		instance.ClusterID,
		instance.Name,
		instance.Namespace,
		instance.RegistryID,
		instance.Repository,
		instance.Chart,
		instance.Version,
		instance.Description,
		valuesJSON,
		instance.ValuesYAML,
		instance.Status,
		instance.StatusReason,
		instance.LastOperation,
		instance.LastError,
		instance.Revision,
		instance.CreatedAt,
		instance.UpdatedAt,
	)

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

	return nil
}

// GetByID 根据 ID 获取实例
func (r *InstanceRepository) GetByID(ctx context.Context, id string) (*entity.Instance, error) {
	query := `
		SELECT id, cluster_id, name, namespace, registry_id, repository, chart, version,
		       description, values, values_yaml, status, status_reason, last_operation, last_error,
		       revision, created_at, updated_at
		FROM instances
		WHERE id = $1
	`

	instance := &entity.Instance{}
	var (
		valuesJSON    []byte
		statusReason  sql.NullString
		lastOperation sql.NullString
		lastError     sql.NullString
	)

	err := r.db.conn.QueryRowContext(ctx, query, id).Scan(
		&instance.ID,
		&instance.ClusterID,
		&instance.Name,
		&instance.Namespace,
		&instance.RegistryID,
		&instance.Repository,
		&instance.Chart,
		&instance.Version,
		&instance.Description,
		&valuesJSON,
		&instance.ValuesYAML,
		&instance.Status,
		&statusReason,
		&lastOperation,
		&lastError,
		&instance.Revision,
		&instance.CreatedAt,
		&instance.UpdatedAt,
	)

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

	// 解析 JSON Values
	if len(valuesJSON) > 0 {
		if err := json.Unmarshal(valuesJSON, &instance.Values); err != nil {
			return nil, fmt.Errorf("failed to unmarshal values: %w", err)
		}
	}

	if statusReason.Valid {
		instance.StatusReason = statusReason.String
	}
	if lastOperation.Valid {
		instance.LastOperation = entity.InstanceOperation(lastOperation.String)
	}
	if lastError.Valid {
		instance.LastError = lastError.String
	}

	return instance, nil
}

// GetByClusterAndName 根据集群 ID 和名称获取实例
func (r *InstanceRepository) GetByClusterAndName(ctx context.Context, clusterID, name string) (*entity.Instance, error) {
	query := `
		SELECT id, cluster_id, name, namespace, registry_id, repository, chart, version,
		       description, values, values_yaml, status, status_reason, last_operation, last_error,
		       revision, created_at, updated_at
		FROM instances
		WHERE cluster_id = $1 AND name = $2
	`

	instance := &entity.Instance{}
	var (
		valuesJSON    []byte
		statusReason  sql.NullString
		lastOperation sql.NullString
		lastError     sql.NullString
	)

	err := r.db.conn.QueryRowContext(ctx, query, clusterID, name).Scan(
		&instance.ID,
		&instance.ClusterID,
		&instance.Name,
		&instance.Namespace,
		&instance.RegistryID,
		&instance.Repository,
		&instance.Chart,
		&instance.Version,
		&instance.Description,
		&valuesJSON,
		&instance.ValuesYAML,
		&instance.Status,
		&statusReason,
		&lastOperation,
		&lastError,
		&instance.Revision,
		&instance.CreatedAt,
		&instance.UpdatedAt,
	)

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

	// 解析 JSON Values
	if len(valuesJSON) > 0 {
		if err := json.Unmarshal(valuesJSON, &instance.Values); err != nil {
			return nil, fmt.Errorf("failed to unmarshal values: %w", err)
		}
	}

	if statusReason.Valid {
		instance.StatusReason = statusReason.String
	}
	if lastOperation.Valid {
		instance.LastOperation = entity.InstanceOperation(lastOperation.String)
	}
	if lastError.Valid {
		instance.LastError = lastError.String
	}

	return instance, nil
}

// Update 更新实例
func (r *InstanceRepository) Update(ctx context.Context, instance *entity.Instance) error {
	instance.UpdatedAt = time.Now()

	// 将 Values 转换为 JSON
	valuesJSON, err := json.Marshal(instance.Values)
	if err != nil {
		return fmt.Errorf("failed to marshal values: %w", err)
	}

	query := `
		UPDATE instances
		SET cluster_id = $1, name = $2, namespace = $3, registry_id = $4, repository = $5,
		    chart = $6, version = $7, description = $8, values = $9, values_yaml = $10,
		    status = $11, status_reason = $12, last_operation = $13, last_error = $14,
		    revision = $15, updated_at = $16
		WHERE id = $17
	`

	result, err := r.db.conn.ExecContext(ctx, query,
		instance.ClusterID,
		instance.Name,
		instance.Namespace,
		instance.RegistryID,
		instance.Repository,
		instance.Chart,
		instance.Version,
		instance.Description,
		valuesJSON,
		instance.ValuesYAML,
		instance.Status,
		instance.StatusReason,
		instance.LastOperation,
		instance.LastError,
		instance.Revision,
		instance.UpdatedAt,
		instance.ID,
	)

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

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

	if rows == 0 {
		return entity.ErrInstanceNotFound
	}

	return nil
}

// Delete 删除实例
func (r *InstanceRepository) Delete(ctx context.Context, id string) error {
	query := `DELETE FROM instances WHERE id = $1`

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

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

	if rows == 0 {
		return entity.ErrInstanceNotFound
	}

	return nil
}

// ListByCluster 列出指定集群的所有实例
func (r *InstanceRepository) ListByCluster(ctx context.Context, clusterID string) ([]*entity.Instance, error) {
	query := `
		SELECT id, cluster_id, name, namespace, registry_id, repository, chart, version,
		       description, values, values_yaml, status, status_reason, last_operation, last_error,
		       revision, created_at, updated_at
		FROM instances
		WHERE cluster_id = $1
		ORDER BY created_at DESC
	`

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

	instances := make([]*entity.Instance, 0)
	for rows.Next() {
		instance := &entity.Instance{}
		var (
			valuesJSON    []byte
			statusReason  sql.NullString
			lastOperation sql.NullString
			lastError     sql.NullString
		)

		err := rows.Scan(
			&instance.ID,
			&instance.ClusterID,
			&instance.Name,
			&instance.Namespace,
			&instance.RegistryID,
			&instance.Repository,
			&instance.Chart,
			&instance.Version,
			&instance.Description,
			&valuesJSON,
			&instance.ValuesYAML,
			&instance.Status,
			&statusReason,
			&lastOperation,
			&lastError,
			&instance.Revision,
			&instance.CreatedAt,
			&instance.UpdatedAt,
		)
		if err != nil {
			return nil, fmt.Errorf("failed to scan instance: %w", err)
		}

		// 解析 JSON Values
		if len(valuesJSON) > 0 {
			if err := json.Unmarshal(valuesJSON, &instance.Values); err != nil {
				return nil, fmt.Errorf("failed to unmarshal values: %w", err)
			}
		}

		if statusReason.Valid {
			instance.StatusReason = statusReason.String
		}
		if lastOperation.Valid {
			instance.LastOperation = entity.InstanceOperation(lastOperation.String)
		}
		if lastError.Valid {
			instance.LastError = lastError.String
		}

		instances = append(instances, instance)
	}

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

	return instances, nil
}

// List 列出所有实例
func (r *InstanceRepository) List(ctx context.Context) ([]*entity.Instance, error) {
	query := `
		SELECT id, cluster_id, name, namespace, registry_id, repository, chart, version,
		       description, values, values_yaml, status, status_reason, last_operation, last_error,
		       revision, created_at, updated_at
		FROM instances
		ORDER BY created_at DESC
	`

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

	instances := make([]*entity.Instance, 0)
	for rows.Next() {
		instance := &entity.Instance{}
		var (
			valuesJSON    []byte
			statusReason  sql.NullString
			lastOperation sql.NullString
			lastError     sql.NullString
		)

		err := rows.Scan(
			&instance.ID,
			&instance.ClusterID,
			&instance.Name,
			&instance.Namespace,
			&instance.RegistryID,
			&instance.Repository,
			&instance.Chart,
			&instance.Version,
			&instance.Description,
			&valuesJSON,
			&instance.ValuesYAML,
			&instance.Status,
			&statusReason,
			&lastOperation,
			&lastError,
			&instance.Revision,
			&instance.CreatedAt,
			&instance.UpdatedAt,
		)
		if err != nil {
			return nil, fmt.Errorf("failed to scan instance: %w", err)
		}

		// 解析 JSON Values
		if len(valuesJSON) > 0 {
			if err := json.Unmarshal(valuesJSON, &instance.Values); err != nil {
				return nil, fmt.Errorf("failed to unmarshal values: %w", err)
			}
		}

		if statusReason.Valid {
			instance.StatusReason = statusReason.String
		}
		if lastOperation.Valid {
			instance.LastOperation = entity.InstanceOperation(lastOperation.String)
		}
		if lastError.Valid {
			instance.LastError = lastError.String
		}

		instances = append(instances, instance)
	}

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

	return instances, nil
}