<?php

declare(strict_types=1);

namespace App\Framework\QrCode;

use InvalidArgumentException;

/**
 * QR Code Generator
 *
 * Main facade for generating QR codes from data.
 * Orchestrates encoding, matrix generation, and rendering.
 */
final readonly class QrCodeGenerator
{
    public function __construct(
        private DataEncoder $dataEncoder,
        private MatrixGenerator $matrixGenerator,
        private SvgRenderer $svgRenderer
    ) {
    }

    /**
     * Create QR code generator with default components
     */
    public static function create(): self
    {
        return new self(
            dataEncoder: new DataEncoder(),
            matrixGenerator: new MatrixGenerator(),
            svgRenderer: new SvgRenderer()
        );
    }

    /**
     * Create QR code generator for TOTP URLs
     */
    public static function forTotp(): self
    {
        return new self(
            dataEncoder: new DataEncoder(),
            matrixGenerator: new MatrixGenerator(),
            svgRenderer: SvgRenderer::withModuleSize(4)->withQuietZone(2)
        );
    }

    /**
     * Generate QR code as SVG string
     */
    public function generateSvg(
        string $data,
        ?ErrorCorrectionLevel $errorLevel = null,
        ?QrCodeVersion $version = null
    ): string {
        $matrix = $this->generateMatrix($data, $errorLevel, $version);

        return $this->svgRenderer->render($matrix);
    }

    /**
     * Generate QR code as SVG data URI
     */
    public function generateDataUri(
        string $data,
        ?ErrorCorrectionLevel $errorLevel = null,
        ?QrCodeVersion $version = null
    ): string {
        $matrix = $this->generateMatrix($data, $errorLevel, $version);

        return $this->svgRenderer->renderAsDataUri($matrix);
    }

    /**
     * Generate QR code matrix
     */
    public function generateMatrix(
        string $data,
        ?ErrorCorrectionLevel $errorLevel = null,
        ?QrCodeVersion $version = null
    ): QrCodeMatrix {
        if (empty($data)) {
            throw new InvalidArgumentException('QR code data cannot be empty');
        }

        $errorLevel = $errorLevel ?? ErrorCorrectionLevel::forTotp();
        $version = $version ?? $this->determineOptimalVersion($data, $errorLevel);

        // Encode data into bit stream
        $encodedData = $this->dataEncoder->encode($data, $version, $errorLevel);

        // Generate matrix from encoded data
        return $this->matrixGenerator->generateMatrix($encodedData, $version, $errorLevel);
    }

    /**
     * Create generator with custom renderer
     */
    public function withRenderer(SvgRenderer $renderer): self
    {
        return new self(
            dataEncoder: $this->dataEncoder,
            matrixGenerator: $this->matrixGenerator,
            svgRenderer: $renderer
        );
    }

    /**
     * Get recommended configuration for data
     */
    public function analyzeData(string $data): array
    {
        if (empty($data)) {
            throw new InvalidArgumentException('Cannot analyze empty data');
        }

        $mode = DataMode::detectForData($data);
        $errorLevel = ErrorCorrectionLevel::forTotp();
        $version = $this->determineOptimalVersion($data, $errorLevel);

        return [
            'data_length' => strlen($data),
            'detected_mode' => $mode,
            'recommended_error_level' => $errorLevel,
            'optimal_version' => $version->getVersion(),
            'matrix_size' => $version->getModuleCount(),
            'data_capacity' => $version->getDataCapacity($errorLevel),
            'efficiency' => $mode->getEfficiency(),
            'capacity_used' => round((strlen($data) / $version->getDataCapacity($errorLevel)) * 100, 1),
        ];
    }

    /**
     * Generate QR code for TOTP URI
     */
    public function generateTotpQrCode(string $totpUri): string
    {
        // Validate TOTP URI format
        if (! str_starts_with($totpUri, 'otpauth://totp/')) {
            throw new InvalidArgumentException('Invalid TOTP URI format');
        }

        // Use appropriate settings for TOTP (allow larger versions)
        $errorLevel = ErrorCorrectionLevel::M; // Medium error correction for TOTP

        return $this->generateSvg($totpUri, $errorLevel, null); // Auto-detect version
    }

    /**
     * Determine the optimal QR code version for given data
     */
    private function determineOptimalVersion(string $data, ErrorCorrectionLevel $errorLevel): QrCodeVersion
    {
        $dataLength = strlen($data);

        // Try to find the smallest version that can fit the data
        return QrCodeVersion::forDataLength($dataLength, $errorLevel);
    }

    /**
     * Get generator configuration
     */
    public function getConfiguration(): array
    {
        return [
            'encoder' => DataEncoder::class,
            'matrix_generator' => MatrixGenerator::class,
            'renderer' => $this->svgRenderer->getConfiguration(),
        ];
    }

    /**
     * Validate data before encoding
     */
    private function validateData(string $data): void
    {
        if (strlen($data) > 2953) { // Max capacity for version 40, error level L
            throw new InvalidArgumentException('Data too large for QR code: ' . strlen($data) . ' bytes');
        }

        // Check for null bytes or other problematic characters
        if (strpos($data, "\0") !== false) {
            throw new InvalidArgumentException('Data contains null bytes');
        }
    }
}