package main

import (
	"bytes"
	"context"

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

// ContactSheetBlockMeta defines the Noir contact sheet block.
var ContactSheetBlockMeta = blocks.BlockMeta{
	Key:         "contact_sheet",
	Title:       "Contact Sheet",
	Description: "Numbered photograph frames with sprocket motif evoking a darkroom contact sheet.",
	Source:      "noir",
	Category:    blocks.CategoryContent,
}

// ContactSheetBlock renders a contact-sheet grid.
// Content shape: {"items":[{"image":"...","frame":"01","label":"..."}, ...]}
func ContactSheetBlock(ctx context.Context, content map[string]any) string {
	items := getSlice(content, "items")

	var frames []ContactFrame
	for i, item := range items {
		frame := getString(item, "frame")
		if frame == "" {
			frame = padFrame(i + 1)
		}
		frames = append(frames, ContactFrame{
			Image: blocks.ResolveMediaPath(getString(item, "image")),
			Frame: frame,
			Label: getString(item, "label"),
		})
	}

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

// ContactFrame represents a single numbered frame in the contact sheet.
type ContactFrame struct {
	Image string
	Frame string
	Label string
}

// padFrame zero-pads a frame number to two digits ("01", "02", ..., "10").
func padFrame(n int) string {
	if n < 10 {
		return "0" + intToString(n)
	}
	return intToString(n)
}