package main

import (
	"bytes"
	"context"
	"sync/atomic"
)

// imgCounter assigns sequential [fig.N] numbers in render order so each
// rendered terminal image gets a unique caption number.
var imgCounter uint64

// TerminalImageBlock wraps the built-in image in a +----+ ASCII frame with
// a [fig.N caption] line beneath it.
//
// Content shape (same as built-in image): {src, alt, caption, width, height}.
func TerminalImageBlock(ctx context.Context, content map[string]any) string {
	src := getString(content, "src")
	alt := getString(content, "alt")
	caption := getString(content, "caption")
	if alt == "" {
		alt = caption
	}

	n := atomic.AddUint64(&imgCounter, 1)

	var buf bytes.Buffer
	_ = terminalImageComponent(src, alt, caption, n).Render(ctx, &buf)
	return buf.String()
}