package deadlinks

import (
	"bytes"
	"fmt"
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestParser(t *testing.T) {
	t.Parallel()

	parser := NewParser()

	tests := []struct {
		mimeType string
		body     string
		wantURLs []URL
		wantErrs []string
	}{
		{
			"image/jpg",
			"ANYTHING",
			nil,
			nil,
		},
		{
			"text/gemini",
			``,
			nil,
			nil,
		},
		{
			"text/gemini",
			`
# HEADER

=> https://foo.com some link
=> empty/path
=> /foo/bar here's an absolute path
=> what.com a domain?

ok here's some text
			`,
			[]URL{
				"https://foo.com",
				"empty/path",
				"/foo/bar",
				"what.com",
			},
			nil,
		},
		{
			"text/gemini",
			`
# HEADER

=> https://foo.com some link
=> empty/path
=> /foo/bar here's an absolute path
=> what.com a domain?

ok here's some text
			`,
			[]URL{
				"https://foo.com",
				"empty/path",
				"/foo/bar",
				"what.com",
			},
			nil,
		},
		{
			"text/gemini",
			`
=> : NO FISH ALLOWED
=> /good/dog
`,
			[]URL{"/good/dog"},
			[]string{
				`parsing URL from line "=> : NO FISH ALLOWED\n": parse ":": missing protocol scheme`,
			},
		},
		{
			"text/html",
			`
				<a href="foo.com">OHAI</a>
				<img src="/bar">
				<img src="/bar/baz" />
				<link rel="stylesheet" href="style.css" />
			`,
			[]URL{"foo.com", "/bar", "/bar/baz", "style.css"},
			nil,
		},
	}

	for i := range tests {
		test := tests[i]
		name := fmt.Sprintf(
			"%d-%s", i, strings.ReplaceAll(test.mimeType, "/", "_"),
		)
		t.Run(name, func(t *testing.T) {
			t.Parallel()

			body := bytes.NewBufferString(test.body)
			gotURLs, gotErr := parser.Parse(test.mimeType, body)

			assert.Equal(t, test.wantURLs, gotURLs)
			if len(test.wantErrs) == 0 {
				assert.NoError(t, gotErr)
				return
			}

			type joinedErr interface {
				Unwrap() []error
			}

			var gotErrs []error
			if joinedErr, ok := gotErr.(joinedErr); ok {
				gotErrs = joinedErr.Unwrap()
			} else if gotErr != nil {
				gotErrs = []error{gotErr}
			}

			gotErrStrs := make([]string, len(gotErrs))
			for i := range gotErrs {
				gotErrStrs[i] = gotErrs[i].Error()
			}

			assert.Equal(t, test.wantErrs, gotErrStrs)
		})
	}
}