package services

import (
	"encoding/json"
	"os"
	"path/filepath"
	"sync"
	"time"

	"arma3-web-server/internal/models"
)

type SettingsManager struct {
	path string
	mu   sync.Mutex
}

func NewSettingsManager(dataDir string) *SettingsManager {
	return &SettingsManager{
		path: filepath.Join(dataDir, "settings.json"),
	}
}

func (sm *SettingsManager) Load() (*models.ServerSettings, error) {
	sm.mu.Lock()
	defer sm.mu.Unlock()

	data, err := os.ReadFile(sm.path)
	if err != nil {
		if os.IsNotExist(err) {
			return sm.defaults(), nil
		}
		return nil, err
	}

	var s models.ServerSettings
	if err := json.Unmarshal(data, &s); err != nil {
		return nil, err
	}
	return &s, nil
}

func (sm *SettingsManager) Save(s *models.ServerSettings) error {
	sm.mu.Lock()
	defer sm.mu.Unlock()

	s.UpdatedAt = time.Now().UTC()
	data, err := json.MarshalIndent(s, "", "  ")
	if err != nil {
		return err
	}
	return os.WriteFile(sm.path, data, 0644)
}

func (sm *SettingsManager) defaults() *models.ServerSettings {
	return &models.ServerSettings{
		IPPort:            "0.0.0.0:2302",
		ServerParameters:  "-server -world=empty -loadMissionToMemory -noPause",
		SteamBranch:       "stable",
		SteamUser:         "anonymous",
		Platform:          "linux",
		ActiveConfig:      "",
		ActiveModlist:     "",
		UpdatedAt:         time.Now().UTC(),
	}
}