<?php

namespace App\Support\Qr;

class QrStyleDefaults
{
    /** @return array<string, mixed> */
    public static function defaults(): array
    {
        return [
            'foreground' => '#000000',
            'background' => '#ffffff',
            'error_correction' => 'M',
            'margin' => 4,
            'module_style' => 'square',
            'finder_outer' => 'square',
            'finder_inner' => 'square',
            'frame_style' => 'none',
            'frame_text' => '',
            'frame_color' => '#000000',
            'scale' => 8,
            'logo_path' => null,
            'gradient_type' => 'none',
            'gradient_color1' => '#000000',
            'gradient_color2' => '#7c3aed',
            'gradient_rotation' => 45,
            'logo_size' => 0.3,
            'logo_margin' => 5,
            'logo_white_bg' => false,
            'logo_shape' => 'none',
        ];
    }

    /** @param  array<string, mixed>|null  $style */
    public static function merge(?array $style): array
    {
        $merged = array_merge(self::defaults(), $style ?? []);

        if (! in_array($merged['error_correction'], ['L', 'M', 'Q', 'H'], true)) {
            $merged['error_correction'] = 'M';
        }

        if (! in_array($merged['module_style'], QrModuleStyleCatalog::keys(), true)) {
            $merged['module_style'] = 'square';
        }

        if (! QrCornerStyleCatalog::isValidOuter((string) ($merged['finder_outer'] ?? 'square'))) {
            $merged['finder_outer'] = 'square';
        }

        if (! QrCornerStyleCatalog::isValidInner((string) ($merged['finder_inner'] ?? 'square'))) {
            $merged['finder_inner'] = 'square';
        }

        if (! QrFrameStyleCatalog::isValid((string) ($merged['frame_style'] ?? 'none'))) {
            $merged['frame_style'] = 'none';
        }

        $merged['frame_text'] = substr(trim((string) ($merged['frame_text'] ?? '')), 0, 100);
        $frameColor = trim((string) ($merged['frame_color'] ?? '#000000'));
        $merged['frame_color'] = preg_match('/^#[0-9a-fA-F]{6}$/', $frameColor) ? $frameColor : '#000000';

        if (! in_array($merged['gradient_type'], ['none', 'linear', 'radial'], true)) {
            $merged['gradient_type'] = 'none';
        }

        $merged['logo_size'] = max(0.1, min(0.4, (float) ($merged['logo_size'] ?? 0.3)));
        $merged['logo_margin'] = max(0, min(15, (int) ($merged['logo_margin'] ?? 5)));
        if (! in_array($merged['logo_shape'], ['none', 'rounded', 'circle'], true)) {
            $merged['logo_shape'] = 'none';
        }
        $merged['logo_white_bg'] = (bool) ($merged['logo_white_bg'] ?? false);

        if ($merged['module_style'] === 'bold') {
            $merged['scale'] = min(16, (int) $merged['scale'] + 2);
        }

        $merged['margin'] = max(0, min(10, (int) $merged['margin']));
        $merged['scale'] = max(4, min(16, (int) $merged['scale']));

        return $merged;
    }

    /** @param  array<string, mixed>|null  $style */
    public static function mergeForRender(?array $style): array
    {
        return QrStyleNormalizer::normalize(self::merge($style));
    }

    /** @param  array<string, mixed>  $style */
    public static function recommendedEcc(array $style): string
    {
        $ecc = (string) ($style['error_correction'] ?? 'M');
        $order = ['L' => 0, 'M' => 1, 'Q' => 2, 'H' => 3];
        $minimum = 'M';
        $moduleStyle = (string) ($style['module_style'] ?? 'square');

        if (in_array($moduleStyle, ['bubble', 'fluid'], true)) {
            $minimum = 'H';
        } elseif (QrModuleStyleCatalog::isDecorative($moduleStyle)) {
            $minimum = 'Q';
        }

        if (! empty($style['logo_path'])) {
            $minimum = 'H';
        }

        if (QrScanReliability::contrastRatio($style) < 4.5) {
            $minimum = 'H';
        }

        return ($order[$minimum] ?? 1) > ($order[$ecc] ?? 1) ? $minimum : $ecc;
    }
}