package godog

import (
	"flag"
	"fmt"
)

func flags(s *suite) *flag.FlagSet {
	set := flag.NewFlagSet("godog", flag.ExitOnError)
	set.StringVar(&s.format, "format", "pretty", "")
	set.StringVar(&s.format, "f", "pretty", "")
	set.StringVar(&s.tags, "tags", "", "")
	set.StringVar(&s.tags, "t", "", "")
	set.BoolVar(&s.definitions, "definitions", false, "")
	set.BoolVar(&s.definitions, "d", false, "")
	set.BoolVar(&s.stopOnFailure, "stop-on-failure", false, "")
	set.BoolVar(&s.version, "version", false, "")
	set.Usage = usage
	return set
}

func usage() {
	// prints an option or argument with a description, or only description
	opt := func(name, desc string) string {
		if len(name) > 0 {
			name += ":"
		}
		return s(2) + cl(name, green) + s(30-len(name)) + desc
	}

	// --- GENERAL ---
	fmt.Println(cl("Usage:", yellow))
	fmt.Println(s(2) + "godog [options] [<paths>]\n")

	// --- ARGUMENTS ---
	fmt.Println(cl("Arguments:", yellow))
	// --> paths
	fmt.Println(opt("paths", "Optional path(s) to execute. Can be:"))
	fmt.Println(opt("", s(4)+"- dir "+cl("(features/)", yellow)))
	fmt.Println(opt("", s(4)+"- feature "+cl("(*.feature)", yellow)))
	fmt.Println(opt("", s(4)+"- scenario at specific line "+cl("(*.feature:10)", yellow)))
	fmt.Println(opt("", "If no paths are listed, suite tries "+cl("features", yellow)+" path by default."))
	fmt.Println("")

	// --- OPTIONS ---
	fmt.Println(cl("Options:", yellow))
	// --> step definitions
	fmt.Println(opt("-d, --definitions", "Print all available step definitions."))
	// --> format
	fmt.Println(opt("-f, --format=pretty", "How to format tests output. Available formats:"))
	for _, f := range formatters {
		fmt.Println(opt("", s(4)+"- "+cl(f.name, yellow)+": "+f.description))
	}
	// --> tags
	fmt.Println(opt("-t, --tags", "Filter scenarios by tags. Expression can be:"))
	fmt.Println(opt("", s(4)+"- "+cl(`"wip"`, yellow)+": run all scenarios with wip tag"))
	fmt.Println(opt("", s(4)+"- "+cl(`"!wip"`, yellow)+": exclude all scenarios with wip tag"))
	fmt.Println(opt("", s(4)+"- "+cl(`"wip !new"`, yellow)+": run wip scenarios, but exclude new"))
	// --> stop on failure
	fmt.Println(opt("--stop-on-failure", "Stop processing on first failed scenario."))
	// --> version
	fmt.Println(opt("--version", "Show current "+cl("godog", yellow)+" version."))
	fmt.Println("")
}