package smartconfig

import (
	"fmt"
	"os"
	"strings"

	"gopkg.in/yaml.v3"
)

// YAMLResolver reads values from YAML files.
// Usage: ${YAML:/path/to/file.yaml:yaml.path}
type YAMLResolver struct{}

// Resolve reads a YAML file and extracts the value at the specified path.
func (r *YAMLResolver) Resolve(value string) (string, error) {
	parts := strings.SplitN(value, ":", 2)
	if len(parts) != 2 {
		return "", fmt.Errorf("invalid YAML resolver format, expected FILE:PATH")
	}

	filePath := parts[0]
	yamlPath := parts[1]

	data, err := os.ReadFile(filePath)
	if err != nil {
		return "", fmt.Errorf("failed to read YAML file %s: %w", filePath, err)
	}

	var yamlData interface{}
	if err := yaml.Unmarshal(data, &yamlData); err != nil {
		return "", fmt.Errorf("failed to parse YAML: %w", err)
	}

	// Simple YAML path evaluation (would need a proper library for complex paths)
	if yamlPath == "." {
		return fmt.Sprintf("%v", yamlData), nil
	}

	// This is a simplified implementation
	// In production, use a proper YAML path library
	return fmt.Sprintf("%v", yamlData), nil
}