package config

import (
	"encoding/json"
	"os"
	"sync"
)

type Config struct {
	Port      int    `json:"port"`
	AdminPort int    `json:"admin_port"`
	RootDir   string `json:"root_dir"`
	mu        sync.RWMutex
}

var defaultConfig = &Config{
	Port:      9000,
	AdminPort: 9001,
	RootDir:   "./web",
}

func Load(path string) (*Config, error) {
	cfg := defaultConfig

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

	if len(data) > 0 {
		err = json.Unmarshal(data, &cfg)
		if err != nil {
			return nil, err
		}
	}

	return cfg, nil
}

func (c *Config) Save(path string) error {
	c.mu.RLock()
	defer c.mu.RUnlock()

	data, err := json.MarshalIndent(c, "", "  ")
	if err != nil {
		return err
	}

	return os.WriteFile(path, data, 0644)
}

func (c *Config) GetPort() int {
	c.mu.RLock()
	defer c.mu.RUnlock()
	return c.Port
}

func (c *Config) SetPort(port int) {
	c.mu.Lock()
	defer c.mu.Unlock()
	c.Port = port
}

func (c *Config) GetAdminPort() int {
	c.mu.RLock()
	defer c.mu.RUnlock()
	return c.AdminPort
}

func (c *Config) GetRootDir() string {
	c.mu.RLock()
	defer c.mu.RUnlock()
	return c.RootDir
}