package utils

import (
	"fmt"
	"time"

	"github.com/briandowns/spinner"
	"github.com/charmbracelet/glamour"
	"github.com/cli/cli/pkg/browser"
)

// OpenInBrowser opens the url in a web browser based on OS and $BROWSER environment variable
func OpenInBrowser(url string) error {
	browseCmd, err := browser.Command(url)
	if err != nil {
		return err
	}
	return PrepareCmd(browseCmd).Run()
}

func RenderMarkdown(text string) (string, error) {
	return glamour.Render(text, "dark")
}

func Pluralize(num int, thing string) string {
	if num == 1 {
		return fmt.Sprintf("%d %s", num, thing)
	} else {
		return fmt.Sprintf("%d %ss", num, thing)
	}
}

func fmtDuration(amount int, unit string) string {
	return fmt.Sprintf("about %s ago", Pluralize(amount, unit))
}

func FuzzyAgo(ago time.Duration) string {
	if ago < time.Minute {
		return "less than a minute ago"
	}
	if ago < time.Hour {
		return fmtDuration(int(ago.Minutes()), "minute")
	}
	if ago < 24*time.Hour {
		return fmtDuration(int(ago.Hours()), "hour")
	}
	if ago < 30*24*time.Hour {
		return fmtDuration(int(ago.Hours())/24, "day")
	}
	if ago < 365*24*time.Hour {
		return fmtDuration(int(ago.Hours())/24/30, "month")
	}

	return fmtDuration(int(ago.Hours()/24/365), "year")
}

func Spinner() *spinner.Spinner {
	return spinner.New(spinner.CharSets[11], 400*time.Millisecond)
}

// ColorFuncForState returns a color function for a PR/Issue state
func ColorFuncForState(state string) func(string) string {
	switch state {
	case "OPEN":
		return Green
	case "CLOSED":
		return Red
	case "MERGED":
		return Magenta
	default:
		return nil
	}
}