package main

import (
	"bytes"
	"context"
	"strconv"

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

// DiagramCaptionBlockMeta defines metadata for the diagram-caption block.
var DiagramCaptionBlockMeta = blocks.BlockMeta{
	Key:         "diagram_caption",
	Title:       "Diagram Caption",
	Description: "Annotated technical figure with a Fig. NN. heading and optional callout pins.",
	Source:      "scifi-clean",
	Category:    blocks.CategoryContent,
}

// DiagramCalloutPin is a percent-positioned overlay pin.
type DiagramCalloutPin struct {
	X     float64
	Y     float64
	Label string
}

// DiagramCaptionData drives the templ render.
type DiagramCaptionData struct {
	Image        string
	FigureNumber string
	Title        string
	Body         string
	CalloutPins  []DiagramCalloutPin
}

// DiagramCaptionBlock renders the diagram-caption block.
// Content shape: {"image": "media:...", "figureNumber": "...", "title": "...", "body": "...",
//                 "calloutPins": [{"x": 12, "y": 50, "label": "..."}]}
func DiagramCaptionBlock(ctx context.Context, content map[string]any) string {
	data := DiagramCaptionData{
		Image:        blocks.ResolveMediaPath(getString(content, "image")),
		FigureNumber: getString(content, "figureNumber"),
		Title:        getString(content, "title"),
		Body:         getString(content, "body"),
	}

	for _, raw := range getSlice(content, "calloutPins") {
		data.CalloutPins = append(data.CalloutPins, DiagramCalloutPin{
			X:     getFloat(raw, "x", 0),
			Y:     getFloat(raw, "y", 0),
			Label: getString(raw, "label"),
		})
	}

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

// percentStyle returns a tiny inline style string positioning the pin in percent.
func percentStyle(x, y float64) string {
	return "left: " + strconv.FormatFloat(x, 'f', 2, 64) + "%; top: " + strconv.FormatFloat(y, 'f', 2, 64) + "%;"
}