// Package foodchain handles I knew a lady... song.
package foodchain
import (
	"strings"
)
var animals = []string{
	"fly", "spider", "bird", "cat", "dog", "goat", "cow", "horse",
}
// second line
var second = []string{
	"", // fly
	"", // spider
	"\nHow absurd to swallow a bird!",
	"\nImagine that, to swallow a cat!",
	"\nWhat a hog, to swallow a dog!",
	"\nJust opened her throat and swallowed a goat!",
	"\nI don't know how she swallowed a cow!",
	"", // horse
}
const wring = "wriggled and jiggled and tickled inside her."
func Verse(num int) string {
	var ret = strings.Builder{}
	if num != 8 {
		ret.WriteString("I know an old lady who swallowed a ")
		ret.WriteString(animals[num-1])
		ret.WriteByte('.')
		if num == 2 {
			ret.WriteString("\nIt ")
			ret.WriteString(wring)
		}
		ret.WriteString(second[num-1])
		for i := num; i > 1; i-- {
			ret.WriteString("\nShe swallowed the ")
			ret.WriteString(animals[i-1])
			ret.WriteString(" to catch the ")
			ret.WriteString(animals[i-2])
			if i == 3 {
				ret.WriteString(" that ")
				ret.WriteString(wring)
			} else {
				ret.WriteByte('.')
			}
		}
		ret.WriteString("\nI don't know why she swallowed the fly. Perhaps she'll die.")
	} else {
		ret.WriteString("I know an old lady who swallowed a horse.")
		ret.WriteString("\nShe's dead, of course!")
	}
	return ret.String()
}
func Verses(lower, upper int) string {
	var ret = strings.Builder{}
	for i := lower; i <= upper; i++ {
		ret.WriteString(Verse(i))
		if i != upper {
			ret.WriteString("\n\n")
		}
	}
	return ret.String()
}
func Song() string {
	return Verses(1, 8)
}