package challenge

import "os"

func Run(configPath, eventsPath string) (string, error) {
	cfgFile, err := os.Open(configPath)
	if err != nil {
		return "", err
	}
	defer cfgFile.Close()

	eventsFile, err := os.Open(eventsPath)
	if err != nil {
		return "", err
	}
	defer eventsFile.Close()

	cfg, err := readConfig(cfgFile)
	if err != nil {
		return "", err
	}
	events, err := readEvents(eventsFile)
	if err != nil {
		return "", err
	}

	engine, err := NewEngine(cfg)
	if err != nil {
		return "", err
	}
	for _, event := range events {
		engine.Apply(event)
	}
	return engine.Output(), nil
}