package xrandr

import (
	"bytes"
	"encoding/json"
	"os/exec"

	"git.milar.in/milarin/bufr"
)

type Config struct {
	Displays []DisplayConfig
}

func GetCurrentConfig() (*Config, error) {
	output, err := exec.Command("xrandr").Output()
	if err != nil {
		return nil, err
	}

	r := bufr.New(bytes.NewReader(output))
	r.StringUntil(isNewLine)

	configs := make([]DisplayConfig, 0)
	for config, err := parseDisplayConfig(r); err == nil; config, err = parseDisplayConfig(r) {
		configs = append(configs, *config)
	}

	if err != nil {
		return nil, err
	}

	return &Config{configs}, nil
}

func (c *Config) String() string {
	data, _ := json.MarshalIndent(c, "", "\t")
	return string(data)
}