package config

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

// Config is the application configuration loaded from JSON.
type Config struct {
	Host string `json:"host"`
	Port int    `json:"port"`
}

// Default returns sensible defaults when no config file is used.
func Default() *Config {
	return &Config{
		Host: "127.0.0.1",
		Port: 8080,
	}
}

// Load reads and parses a JSON config file from path.
func Load(path string) (*Config, error) {
	data, err := os.ReadFile(path)
	if err != nil {
		return nil, fmt.Errorf("read config: %w", err)
	}

	cfg := Default()
	if err := json.Unmarshal(data, cfg); err != nil {
		return nil, fmt.Errorf("parse config: %w", err)
	}

	return cfg, nil
}