package main

import (
	"bytes"
	"context"

	"git.dev.alexdunmow.com/block/core/blocks"
)

// DropcapIntroBlockMeta describes the Editorial drop-cap intro block: an
// opening paragraph whose first letter is rendered as an oxblood drop cap.
// Registered as "editorial:dropcap_intro" at runtime.
var DropcapIntroBlockMeta = blocks.BlockMeta{
	Key:         "dropcap_intro",
	Title:       "Drop Cap Intro",
	Description: "Opening paragraph with an oxblood Playfair drop cap",
	Source:      "editorial",
	Category:    blocks.CategoryTheme,
}

// DropcapIntroData carries parsed drop-cap-intro content.
type DropcapIntroData struct {
	Lead string // rich-text payload, trusted upstream
}

// DropcapIntroBlock renders the opening paragraph.
//
// The drop cap is rendered via CSS (::first-letter on the first <p>) rather
// than by extracting the first character server-side. This is the simpler
// path and works for ASCII openers. The spec calls out a known risk: an
// opener starting with `"` or `—` will style the punctuation. That fallback
// is acceptable for this build pass and is documented in BUILD_REPORT.md.
//
// Content shape:
//
//	{ "lead": "<p>The reform was always going to be quiet.</p>" }
func DropcapIntroBlock(ctx context.Context, content map[string]any) string {
	data := DropcapIntroData{
		Lead: getString(content, "lead"),
	}

	if data.Lead == "" {
		return ""
	}

	var buf bytes.Buffer
	_ = dropcapIntroComponent(data).Render(ctx, &buf)
	return buf.String()
}