package vset

import (
	"fmt"
	"os"
	"strings"
)

// The Path interface contains two functions: Validate() and Update().
// Validate() validates the input path from Start().
// Once validated, the path is passed to Update() to check if the .vscode directory and settings.json file exist.
// If either of those items don't exist, Update() creates and adds them to the path.
// The updated path is returned to Start().
type Path interface {
	Update(path string) string
	Validate(path string)
}

func Update(path string) (string, error) {
	// Assert that the path ends with a /.
	if !strings.HasSuffix(path, "/") {
		path = path + "/"
	}

	if err := Validate(path); err != nil {
		return "", err
	}
	goLintPath = path
	path = path + ".vscode"

	// Check if .vscode directory exists and create it if it doesn't.
	_, err := os.Stat(path)
	if os.IsNotExist(err) {
		err = os.MkdirAll(path, 0755)
		if err != nil {
			return "", fmt.Errorf("failed to create .vscode dir: %w", err)
		}
	}

	path = path + "/settings.json"
	_, err = os.ReadFile(path)

	// If a user does not have a settings.json file, an empty one is created for configuration.
	if err != nil {
		err = os.WriteFile(path, []byte(`{}`), 0644)
		if err != nil {
			return "", fmt.Errorf("failed to create settings.json: %w", err)
		}
	}
	return path, nil
}

func Validate(path string) error {
	// Validate the path.
	_, err := os.Stat(path)
	if os.IsNotExist(err) {
		return fmt.Errorf("invalid path: %w", err)
	}
	return nil
}