// Package config handles loading the config.
package config

import (
	"flag"
	"fmt"
	"os"

	"gopkg.in/yaml.v3"
)

var Default *Mod

type Cmd struct {
	Binary    string
	Arguments []string
}

type Config struct {
	H264Cmd *Cmd `yaml:"h264"`
	IVFCmd  *Cmd `yaml:"ivf"`
}

func New(source []byte) (*Config, error) {
	config := &Config{}
	if err := yaml.Unmarshal(source, config); err != nil {
		return nil, fmt.Errorf("failed to parse config: %w", err)
	}
	return config, nil
}

type Mod struct {
	filePath string
}

func (m *Mod) RegisterFlags(fs *flag.FlagSet) {
	fs.StringVar(&m.filePath, "watcher_config", "", "path to the watcher configuration")
}

func (m *Mod) Get() (*Config, error) {
	bytes, err := os.ReadFile(m.filePath)
	if err != nil {
		return nil, fmt.Errorf("failed to read file %q: %w", m.filePath, err)
	}

	config, err := New(bytes)
	if err != nil {
		return nil, err
	}

	return config, nil
}

func init() {
	Default = &Mod{}
	Default.RegisterFlags(flag.CommandLine)
}