package main

import (
	"bytes"
	"context"

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

// PhotoEssayBlockMeta is the numbered photo-essay scaffolding.
var PhotoEssayBlockMeta = blocks.BlockMeta{
	Key:         "photo_essay",
	Title:       "Photo Essay",
	Description: "Numbered photo-essay with asymmetric frame spans (half / full / tall) and mono captions.",
	Source:      "magazine-bold",
	Category:    blocks.CategoryContent,
}

// PhotoFrame is a single image in the photo essay.
type PhotoFrame struct {
	Number  int
	Image   string
	Caption string
	Span    string
}

// PhotoEssayData is what the templ component consumes.
type PhotoEssayData struct {
	Title  string
	Frames []PhotoFrame
}

// PhotoEssayBlock renders the photo essay scaffolding.
// content keys: title (text), frames (collection of {image, caption, span}).
func PhotoEssayBlock(ctx context.Context, content map[string]any) string {
	rawFrames := getSlice(content, "frames")
	frames := make([]PhotoFrame, 0, len(rawFrames))
	for i, item := range rawFrames {
		img := blocks.ResolveMediaPath(getString(item, "image"))
		// Skip frames that have no image (malformed-content safety).
		if img == "" {
			continue
		}
		frames = append(frames, PhotoFrame{
			Number:  i + 1,
			Image:   img,
			Caption: getString(item, "caption"),
			Span:    normalizeSpan(getString(item, "span")),
		})
	}
	data := PhotoEssayData{
		Title:  getString(content, "title"),
		Frames: frames,
	}
	var buf bytes.Buffer
	_ = photoEssayComponent(data).Render(ctx, &buf)
	return buf.String()
}

// photoFrameSpanClass maps a span string to its CSS utility class.
func photoFrameSpanClass(span string) string {
	switch span {
	case "full":
		return "mb-frame-full"
	case "tall":
		return "mb-frame-tall"
	default:
		return "mb-frame-half"
	}
}