package config

import (
	"fmt"
	"os"

	"github.com/pelletier/go-toml/v2"
)

type (
	Config struct {
		Google GoogleConfig `toml:"google"`
	}

	GoogleConfig struct {
		ApiKey string `toml:"api_key"`
		ClientID string `toml:"client_id"`
		ClientSecret string `toml:"client_secret"`
	}
)

var defaultConfig = Config{
	Google: GoogleConfig{
		ApiKey: "<your API key here>",
		ClientID: "<your client ID here>",
		ClientSecret: "<your client secret here>",
	},
}

const CONFIG_FILENAME = "config.toml"

func ReadConfig(filename string) (*Config, error) {
	cfgBytes, err := os.ReadFile(filename)
	if err != nil {
		if err == os.ErrNotExist {
			return nil, nil
		}
		return nil, fmt.Errorf("failed to open file: %v", err)
	}

	config := Config{}
	err = toml.Unmarshal(cfgBytes, &config)
	if err != nil { return &config, fmt.Errorf("failed to parse: %v", err) }

	return &config, nil
}

func GenerateConfig(filename string) error {
	file, err := os.OpenFile(filename, os.O_CREATE, 0644)
	if err != nil { return err }

	err = toml.NewEncoder(file).Encode(defaultConfig)
	if err != nil { return err }

	return nil
}