package config

import (
	"fmt"
	"os"
	"path/filepath"

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

type (
	Pins          map[Thing]GPIO
	SerialTargets map[Serial]string
)

type Config struct {
	Pins          Pins          `toml:"pins"`
	SerialTargets SerialTargets `toml:"serial_targets"`
}

func (p Pins) MarshalTOML() ([]byte, error) {
	var rendered string
	for thing, pin := range p {
		rendered += fmt.Sprintf("%s = %d\n", thing.String(), pin)
	}
	return []byte(rendered), nil
}

func ReadConfig(path string) (*Config, error) {
	var config = &Config{}
	b, e := os.ReadFile(path)
	if e != nil {
		return nil, e
	}
	err := toml.Unmarshal(b, config)
	return config, err
}

func (c *Config) WriteConfig(path string) error {
	b, e := toml.Marshal(c)
	if e != nil {
		return e
	}
	if e = os.MkdirAll(filepath.Dir(path), 0755); e != nil {
		return e
	}
	return os.WriteFile(path, b, 0755)
}