package explainer

import (
	"strings"
	"testing"
)

func TestFormatSummary(t *testing.T) {
	cases := []struct {
		name      string
		in        string
		wantPlain string
		wantHTML  string
	}{
		{
			name:      "dash bullets",
			in:        "- First point.\n- Second point.\n- Third point.",
			wantPlain: "• First point.\n• Second point.\n• Third point.",
			wantHTML:  "<ul><li>First point.</li><li>Second point.</li><li>Third point.</li></ul>",
		},
		{
			name:      "asterisk bullets",
			in:        "* alpha\n* beta",
			wantPlain: "• alpha\n• beta",
			wantHTML:  "<ul><li>alpha</li><li>beta</li></ul>",
		},
		{
			name:      "unicode bullets",
			in:        "• one\n• two",
			wantPlain: "• one\n• two",
			wantHTML:  "<ul><li>one</li><li>two</li></ul>",
		},
		{
			name:      "blank lines ignored",
			in:        "- a\n\n- b\n\n\n- c",
			wantPlain: "• a\n• b\n• c",
			wantHTML:  "<ul><li>a</li><li>b</li><li>c</li></ul>",
		},
		{
			name:      "summary header stripped",
			in:        "Summary:\n- first\n- second",
			wantPlain: "• first\n• second",
			wantHTML:  "<ul><li>first</li><li>second</li></ul>",
		},
		{
			name:      "tldr header stripped",
			in:        "TL;DR of the article\n- key point\n- other point",
			wantPlain: "• key point\n• other point",
			wantHTML:  "<ul><li>key point</li><li>other point</li></ul>",
		},
		{
			name:      "single bullet",
			in:        "- just one",
			wantPlain: "• just one",
			wantHTML:  "<ul><li>just one</li></ul>",
		},
		{
			name:      "html escaped in bullets",
			in:        `- A "quote" & <tag>`,
			wantPlain: `• A "quote" & <tag>`,
			wantHTML:  "<ul><li>A &#34;quote&#34; &amp; &lt;tag&gt;</li></ul>",
		},
		{
			name:      "leading whitespace trimmed",
			in:        "   - first\n   - second   ",
			wantPlain: "• first\n• second",
			wantHTML:  "<ul><li>first</li><li>second</li></ul>",
		},
	}
	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			gotPlain, gotHTML := formatSummary(c.in)
			if gotPlain != c.wantPlain {
				t.Errorf("plain:\n got  %q\n want %q", gotPlain, c.wantPlain)
			}
			if gotHTML != c.wantHTML {
				t.Errorf("html:\n got  %q\n want %q", gotHTML, c.wantHTML)
			}
		})
	}
}

func TestFormatSummary_NoBulletsPassthrough(t *testing.T) {
	in := "Just a single paragraph with no bullets at all."
	plain, htmlBody := formatSummary(in)
	if plain != in {
		t.Errorf("plain should pass through raw, got %q", plain)
	}
	if !strings.HasPrefix(htmlBody, "<pre>") || !strings.HasSuffix(htmlBody, "</pre>") {
		t.Errorf("html should wrap raw in <pre>, got %q", htmlBody)
	}
	if !strings.Contains(htmlBody, "single paragraph") {
		t.Errorf("html should contain the body text, got %q", htmlBody)
	}
}

func TestIsQuestionReaction(t *testing.T) {
	want := []string{"❓", "❔", "⁉", "⁉️", "🤔", "?", "？"}
	for _, k := range want {
		if !IsQuestionReaction(k) {
			t.Errorf("expected %q to trigger explain", k)
		}
	}
	notQuestion := []string{"👍", "👎", "🔥", "", "??", "❤️"}
	for _, k := range notQuestion {
		if IsQuestionReaction(k) {
			t.Errorf("expected %q to NOT trigger explain", k)
		}
	}
}