package main

import (
	"encoding/json"
	"io"
	"net"
	"os"
	"path/filepath"
)

const configPathRelative = `.config/soundbox/config.json`

type MacAddress net.HardwareAddr

func (m *MacAddress) UnmarshalJSON(data []byte) error {
	var macStr string
	err := json.Unmarshal(data, &macStr)
	if err != nil {
		return err
	}

	hwAddr, err := net.ParseMAC(macStr)
	if err != nil {
		return err
	}

	*m = MacAddress(hwAddr)
	return nil
}

type SoundboxConfig struct {
	Name string     `json:"name"`
	Mac  MacAddress `json:"mac"`
}

type URLConfig struct {
	Name string `json:"name"`
	Url  string `json:"url"`
}

type GlobalConfig struct {
	Soundboxes []SoundboxConfig `json:"soundboxes"`
	URLs       []URLConfig      `json:"urls"`
}

func loadConfig() (GlobalConfig, error) {
	home, err := os.UserHomeDir()
	if err != nil {
		return GlobalConfig{}, err
	}

	path := filepath.Join(home, configPathRelative)

	file, err := os.Open(path)
	if err != nil {
		return GlobalConfig{}, err
	}
	defer file.Close()

	bytes, err := io.ReadAll(file)
	if err != nil {
		return GlobalConfig{}, err
	}

	var config GlobalConfig
	err = json.Unmarshal(bytes, &config)
	if err != nil {
		return GlobalConfig{}, err
	}

	return config, nil
}