package matrix

import (
	"strings"
	"testing"
)

func TestFormatPost_Basic(t *testing.T) {
	story := &PostableStory{
		Headline:   "GPU prices drop 30% amid oversupply",
		ArticleURL: "https://example.com/gpu-prices",
		Lede:       "Graphics card prices have fallen sharply across all tiers.",
		Source:     "Ars Technica",
		Channel:    "tech",
	}

	plain, html := formatPost(story)

	// Plain text checks
	if !strings.Contains(plain, "**GPU prices drop 30% amid oversupply**") {
		t.Errorf("plain missing bold headline: %s", plain)
	}
	if !strings.Contains(plain, "→ https://example.com/gpu-prices") {
		t.Errorf("plain missing article URL: %s", plain)
	}
	if !strings.Contains(plain, "Graphics card prices") {
		t.Errorf("plain missing lede: %s", plain)
	}
	if !strings.Contains(plain, "`ars technica`") {
		t.Errorf("plain missing source tag (lowercase): %s", plain)
	}

	// HTML checks
	if !strings.Contains(html, `<strong><a href="https://example.com/gpu-prices">GPU prices drop 30% amid oversupply</a></strong>`) {
		t.Errorf("html missing linked headline: %s", html)
	}
	if !strings.Contains(html, "<code>ars technica</code>") {
		t.Errorf("html missing source code tag: %s", html)
	}
}

func TestFormatPost_WithPlatforms(t *testing.T) {
	story := &PostableStory{
		Headline:   "Switch 2 launch lineup revealed",
		ArticleURL: "https://example.com/switch2",
		Lede:       "Nintendo confirms 20 titles for day one.",
		Source:     "Eurogamer",
		Channel:    "gaming",
		Platforms:  []string{"nintendo-switch"},
	}

	plain, html := formatPost(story)

	if !strings.Contains(plain, "`eurogamer` · `nintendo-switch`") {
		t.Errorf("plain missing platform tag: %s", plain)
	}
	if !strings.Contains(html, "<code>eurogamer</code> · <code>nintendo-switch</code>") {
		t.Errorf("html missing platform tag: %s", html)
	}
}

func TestFormatPost_MultiplePlatforms(t *testing.T) {
	story := &PostableStory{
		Headline:   "Elden Ring Nightreign launches",
		ArticleURL: "https://example.com/er",
		Lede:       "Available on all major platforms.",
		Source:     "Ars Technica",
		Channel:    "gaming",
		Platforms:  []string{"pc", "playstation", "xbox"},
	}

	plain, _ := formatPost(story)

	if !strings.Contains(plain, "`ars technica` · `pc` · `playstation` · `xbox`") {
		t.Errorf("plain tags wrong: %s", plain)
	}
}

func TestFormatPost_EmptyLede(t *testing.T) {
	story := &PostableStory{
		Headline:   "Breaking news",
		ArticleURL: "https://example.com/breaking",
		Source:     "Guardian",
		Channel:    "politics",
	}

	plain, html := formatPost(story)

	// Should have headline and source but no empty line for lede
	lines := strings.Split(plain, "\n")
	if len(lines) != 2 {
		t.Errorf("expected 2 lines (headline + source), got %d: %v", len(lines), lines)
	}

	parts := strings.Split(html, "<br/>")
	if len(parts) != 2 {
		t.Errorf("expected 2 html parts, got %d: %v", len(parts), parts)
	}
}

func TestFormatPost_HTMLEscaping(t *testing.T) {
	story := &PostableStory{
		Headline:   `Apple's "M5" chip: <faster> & better`,
		ArticleURL: "https://example.com/m5",
		Lede:       `Performance gains of >50% in "real-world" tests.`,
		Source:     "Test & Source",
		Channel:    "tech",
	}

	_, html := formatPost(story)

	if strings.Contains(html, "<faster>") {
		t.Error("html contains unescaped angle brackets in headline")
	}
	if !strings.Contains(html, "&amp;") {
		t.Error("html missing escaped ampersand")
	}
	if !strings.Contains(html, "&gt;50%") {
		t.Error("html missing escaped > in lede")
	}
}