package test

import (
	"fmt"
	"io"
	"os"
	"testing"

	"git.brandonirizarry.xyz/links/internal/findlinks"
	"github.com/google/go-cmp/cmp"
)

type parserFn func(io.Reader) ([]findlinks.Link, error)

func findLinksFile(filename string, parser parserFn) ([]findlinks.Link, error) {
	f, err := os.Open(filename)
	if err != nil {
		panic("can't open test file")
	}
	defer f.Close()

	return parser(f)
}

func TestFindlinks(t *testing.T) {
	type test struct {
		filename string
		links    []findlinks.Link
	}

	tests := []test{
		{
			"html/ex1.html",
			[]findlinks.Link{
				{
					Href: "/other-page",
					Text: "A link to another page",
				},
			},
		},
		{
			"html/ex2.html",
			[]findlinks.Link{
				{
					Href: "https://www.twitter.com/joncalhoun",
					Text: "Check me out on twitter",
				},
				{
					Href: "https://github.com/gophercises",
					Text: "Gophercises is on Github!",
				},
			},
		},
		{
			"html/ex4.html",
			[]findlinks.Link{
				{
					Href: "/dog-cat",
					Text: "dog cat",
				},
			},
		},
	}

	for _, test := range tests {
		parsers := []parserFn{findlinks.Parse}

		for i, p := range parsers {
			testName := fmt.Sprintf("Parser %d %s", i+1, test.filename)

			t.Run(testName, func(t *testing.T) {
				links, err := findLinksFile(test.filename, p)
				if err != nil {
					t.Error(err)
				}

				if !cmp.Equal(links, test.links) {
					t.Errorf("got %v, want %v", links, test.links)
				}
			})
		}
	}

}