// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
// SPDX-License-Identifier: MIT

package markdown

import (
	"bytes"
	"testing"
)

func TestDeterministicOutput(t *testing.T) {
	source := []byte("# Title\n\nText with < and &.\n\n- one\n  - nested\n\n> quoted\n\n" +
		"```go\nx := 1\n```\n\n[ref]: /url \"title\"\n")
	first := RenderHTML(source)
	for i := range 10 {
		if next := RenderHTML(source); !bytes.Equal(first, next) {
			t.Fatalf("render %d differs:\nfirst: %q\nnext:  %q", i, first, next)
		}
	}
}

func TestReferenceNormalisation(t *testing.T) {
	doc := Parse([]byte("[Foo Bar]: /first\n[FOO\t bar]: /second\n"))
	if len(doc.refs) != 1 {
		t.Fatalf("got %d references, want 1", len(doc.refs))
	}
	ref, ok := doc.refs["foo bar"]
	if !ok {
		t.Fatalf("no reference under the normalised label \"foo bar\"")
	}
	if ref.destination != "/first" {
		t.Errorf("destination = %q, want \"/first\": the first definition wins", ref.destination)
	}
}

func TestReferenceTitleKept(t *testing.T) {
	doc := Parse([]byte("[foo]: /url 'the title'\n"))
	ref, ok := doc.refs["foo"]
	if !ok {
		t.Fatal("no reference recorded")
	}
	if !ref.hasTitle || ref.title != "the title" {
		t.Errorf("title = %q with hasTitle %v, want \"the title\" with hasTitle", ref.title, ref.hasTitle)
	}
}

func TestJunkAfterTitleIsNotADefinition(t *testing.T) {
	doc := Parse([]byte("[foo]: /url \"title\" ok\n"))
	if len(doc.refs) != 0 {
		t.Errorf("got %d references, want 0", len(doc.refs))
	}
	if len(doc.children) != 1 || doc.children[0].kind != kindParagraph {
		t.Fatalf("the line should stay a paragraph")
	}
}

func TestBacktickInfoStringRejectsFence(t *testing.T) {
	doc := Parse([]byte("``` aaa ```\n"))
	if len(doc.children) != 1 || doc.children[0].kind != kindParagraph {
		t.Fatalf("the line should stay a paragraph, got %d children", len(doc.children))
	}
}

func TestParseEmptyDocument(t *testing.T) {
	doc := Parse(nil)
	if doc.kind != kindDocument || len(doc.children) != 0 {
		t.Errorf("Parse(nil) should give an empty document")
	}
}