package app

import (
	"errors"
	"fmt"
	"os"
	"strings"
)

// Preferred browsers list.
var browsers = []string{
	"/usr/bin/firefox",
	"/usr/bin/chromium",
	"/usr/bin/chromium-browser",
	"/usr/bin/google-chrome",
}

// DetectBrowser auto-detects a preferred web browser and returns its path.
func DetectBrowser() (string, error) {
	for _, path := range browsers {
		if _, err := os.Stat(path); err == nil {
			return path, nil
		}
	}
	return "", errors.New("failed to auto-detect a web browser")
}

// DetectExec auto-detects the exec line syntax for the selected browser.
func DetectExec(browser string) (string, error) {
	if strings.Contains(browser, "firefox") {
		return fmt.Sprintf("%s --ssb %%s", browser), nil
	} else if strings.Contains(browser, "chromium") || strings.Contains(browser, "chrome") {
		return fmt.Sprintf("%s --app=%%s", browser), nil
	}
	return "", errors.New("failed to auto-detect the browser exec line")
}