package settings

import (
	"encoding/json"
	"fmt"
	"os"
	"path/filepath"
)

// LoadSettings reads and parses settings.json from dir.
func LoadSettings(dir string) (Settings, error) {
	path := filepath.Join(dir, SettingsFileName)
	payload, err := os.ReadFile(path)
	if err != nil {
		return Settings{}, fmt.Errorf("read settings: %w", err)
	}

	var settings Settings
	if err := json.Unmarshal(payload, &settings); err != nil {
		return Settings{}, fmt.Errorf("parse settings: %w", err)
	}
	return settings, nil
}

// SaveSettings writes settings.json to dir with mode 0640.
func SaveSettings(dir string, settings Settings) error {
	if err := ensureConfigDir(dir); err != nil {
		return err
	}

	payload, err := json.MarshalIndent(settings, "", "  ")
	if err != nil {
		return fmt.Errorf("encode settings: %w", err)
	}
	payload = append(payload, '\n')

	path := filepath.Join(dir, SettingsFileName)
	if err := os.WriteFile(path, payload, 0o640); err != nil {
		return fmt.Errorf("write settings: %w", err)
	}
	return nil
}