package main

import (
	"bytes"
	"context"

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

// MarginaliaBlockMeta describes the Editorial marginalia rail block: a list of
// italic notes anchored to in-body markers. At narrow viewports the rail
// collapses to inline asides via CSS.
// Registered as "editorial:marginalia" at runtime.
var MarginaliaBlockMeta = blocks.BlockMeta{
	Key:         "marginalia",
	Title:       "Marginalia Rail",
	Description: "Right-rail italic notes for longform articles",
	Source:      "editorial",
	Category:    blocks.CategoryTheme,
}

// MarginaliaNote is one row in the marginalia rail.
type MarginaliaNote struct {
	Note   string // rich-text payload
	Anchor string
}

// MarginaliaData carries parsed marginalia content.
type MarginaliaData struct {
	Notes []MarginaliaNote
}

// MarginaliaBlock renders the marginalia rail.
//
// Content shape:
//
//	{
//	  "items": [
//	    { "note": "<p>Sourced from the 2024 audit.</p>", "anchor": "¶3" }
//	  ]
//	}
func MarginaliaBlock(ctx context.Context, content map[string]any) string {
	items := getSlice(content, "items")

	notes := make([]MarginaliaNote, 0, len(items))
	for _, item := range items {
		notes = append(notes, MarginaliaNote{
			Note:   getString(item, "note"),
			Anchor: getString(item, "anchor"),
		})
	}

	data := MarginaliaData{Notes: notes}

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