// PDF Layout Configuration Module
// Centralized configuration for PDF generation layouts, using millimeters.

import {
	PHOTO_DIMENSIONS,
	TEXT_FIELD_LAYOUT,
	PHOTO_FIELD_LAYOUT
} from './pdfSettings';
import { get } from 'idb-keyval';

// Conversion factor from millimeters to points (1 inch = 72 points, 1 inch = 25.4 mm)
export const MM_TO_PT = 72 / 25.4;

export interface GridLayout {
	cols: number;
	rows: number;
	cellWidth: number; // mm
	cellHeight: number; // mm
}

// Function to retrieve a blob from IndexedDB
export async function getImageBlob(url: string): Promise<Blob | undefined> {
	return await get(url);
}

// Calculate how many cards can fit on a page.
export function calculateGrid(
	pageWidth: number,
	pageHeight: number,
	margin: number,
	cardWidth: number,
	cardHeight: number
): GridLayout {
	const printableWidth = pageWidth - 2 * margin;
	const printableHeight = pageHeight - 2 * margin;

	const cols = Math.floor(printableWidth / cardWidth);
	const rows = Math.floor(printableHeight / cardHeight);

	return {
		cols,
		rows,
		cellWidth: cardWidth,
		cellHeight: cardHeight
	};
}

// Helper function to get absolute position in points for pdf-lib
export function getAbsolutePositionPt(
	cellX_mm: number,
	cellY_mm: number,
	pageHeight_mm: number,
	relativePos_mm: any
): { x: number; y: number; size: number } {
	const absoluteX_mm = cellX_mm + relativePos_mm.x;
	// pdf-lib Y-coordinate is from bottom, so we invert
	const absoluteY_mm = pageHeight_mm - (cellY_mm + relativePos_mm.y);

	return {
		x: absoluteX_mm * MM_TO_PT,
		y: absoluteY_mm * MM_TO_PT,
		size: relativePos_mm.size // size is already in points
	};
}

// Helper function to get absolute photo dimensions in points for pdf-lib
export function getAbsolutePhotoDimensionsPt(
	cellX_mm: number,
	cellY_mm: number,
	pageHeight_mm: number,
	relativePhoto_mm: any
): { x: number; y: number; width: number; height: number } {
	const absoluteX_mm = cellX_mm + relativePhoto_mm.x;
	// pdf-lib Y-coordinate is from bottom, so we invert and account for height
	const absoluteY_mm = pageHeight_mm - (cellY_mm + relativePhoto_mm.y + relativePhoto_mm.height);

	return {
		x: absoluteX_mm * MM_TO_PT,
		y: absoluteY_mm * MM_TO_PT,
		width: relativePhoto_mm.width * MM_TO_PT,
		height: relativePhoto_mm.height * MM_TO_PT
	};
}

// Border configuration
export const BORDER_CONFIG = {
	color: { r: 0.8, g: 0.8, b: 0.8 },
	width: 1 // in points
};

// Text configuration
export const TEXT_CONFIG = {
	color: { r: 0, g: 0, b: 0 },
	lineHeight: 14 // in points
};

// Placeholder text configuration
export const PLACEHOLDER_CONFIG = {
	text: 'Photo placeholder',
	color: { r: 0.5, g: 0.5, b: 0.5 },
	size: 8 // in points
};