package validate

import (
	"errors"
	"fmt"
	"testing"
)

func ExamplePrefix() {
	fmt.Println(Prefix("https://")("http://example.com"))
	// Output: must start with "https://"
}

func TestPrefix(t *testing.T) {
	testCases := map[string]error{
		"https://example.com": nil,
		"https://":            nil,

		"http://example.com": ErrMissingPrefix.With("https://"),
		"":                   ErrMissingPrefix.With("https://"),
	}

	v := Prefix("https://")
	for input, want := range testCases {
		t.Run(input, func(t *testing.T) {
			if got := v(input); !errors.Is(got, want) {
				t.Error("got", got, "want", want)
			}
		})
	}
}

func TestSuffix(t *testing.T) {
	testCases := map[string]error{
		"report.pdf": nil,
		".pdf":       nil,

		"report.txt": ErrMissingSuffix.With(".pdf"),
		"pdf":        ErrMissingSuffix.With(".pdf"),
	}

	v := Suffix(".pdf")
	for input, want := range testCases {
		t.Run(input, func(t *testing.T) {
			if got := v(input); !errors.Is(got, want) {
				t.Error("got", got, "want", want)
			}
		})
	}
}

func TestContains(t *testing.T) {
	testCases := map[string]error{
		"a b c": nil,
		" ":     nil,

		"abc": ErrMissingSubstring.With(" "),
		"":    ErrMissingSubstring.With(" "),
	}

	v := Contains(" ")
	for input, want := range testCases {
		t.Run(input, func(t *testing.T) {
			if got := v(input); !errors.Is(got, want) {
				t.Error("got", got, "want", want)
			}
		})
	}
}