<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\File;
use Illuminate\Support\Str;

class Lensa extends Model
{
    public const DEFAULT_STOCK = 2;

    private const IMAGE_DIRECTORY = 'images/kameras';

    private static ?array $cachedImagePaths = null;

    protected $fillable = [
        'kode_lensa', 'nama', 'merek', 'harga_sewa', 'stok',
        'aperture_score', 'stabilisasi', 'fleksibilitas'
    ];

    public function getImagePathAttribute(): ?string
    {
        $images = self::availableImages();

        if ($images === []) {
            return null;
        }

        $brand = is_string($this->merek) ? $this->merek : '';
        $name = is_string($this->nama) ? $this->nama : '';
        $sourceName = Str::startsWith(Str::lower($name), Str::lower($brand)) ? $name : trim($brand.' '.$name);
        $fullCompactVariants = self::compactVariants($sourceName);
        $modelCompactVariants = self::compactVariants($name);
        $brandVariants = self::brandVariants($brand);
        $bestMatch = null;
        $bestScore = 0;

        foreach ($images as $image) {
            $score = self::scoreImageMatch($image, $fullCompactVariants, $modelCompactVariants, $brandVariants);

            if ($score > $bestScore) {
                $bestScore = $score;
                $bestMatch = $image['path'];
            }
        }

        return $bestScore >= 70 ? $bestMatch : null;
    }

    private static function availableImages(): array
    {
        if (self::$cachedImagePaths !== null) {
            return self::$cachedImagePaths;
        }

        $directory = public_path(self::IMAGE_DIRECTORY);

        if (! File::isDirectory($directory)) {
            return self::$cachedImagePaths = [];
        }

        return self::$cachedImagePaths = collect(File::files($directory))
            ->filter(fn ($file) => in_array(strtolower($file->getExtension()), ['jpg', 'jpeg', 'png', 'webp'], true))
            ->map(function ($file): array {
                return [
                    'path' => self::IMAGE_DIRECTORY.'/'.$file->getFilename(),
                    'compact' => self::compactString(pathinfo($file->getFilename(), PATHINFO_FILENAME)),
                    'priority' => self::extensionPriority($file->getExtension()),
                    'length' => strlen($file->getFilename()),
                ];
            })
            ->sortBy([
                ['priority', 'asc'],
                ['length', 'asc'],
                ['path', 'asc'],
            ])
            ->values()
            ->all();
    }

    private static function scoreImageMatch(array $image, array $fullCompactVariants, array $modelCompactVariants, array $brandVariants): int
    {
        $score = 0;
        $fileCompact = $image['compact'];

        if ($brandVariants !== [] && ! collect($brandVariants)->contains(fn ($brand) => Str::contains($fileCompact, $brand))) {
            return 0;
        }

        foreach ($fullCompactVariants as $variant) {
            if ($variant !== '' && $fileCompact === $variant) {
                return 160;
            }

            if ($variant !== '' && Str::contains($fileCompact, $variant)) {
                $score = max($score, 125);
            }
        }

        foreach ($modelCompactVariants as $variant) {
            if ($variant !== '' && $fileCompact === $variant) {
                return 150;
            }

            if ($variant !== '' && Str::contains($fileCompact, $variant)) {
                $score = max($score, 115);
            }
        }

        $meaningfulTokens = self::meaningfulTokens($modelCompactVariants[0] ?? '');
        $matchedTokens = array_values(array_filter(
            $meaningfulTokens,
            fn ($token) => Str::contains($fileCompact, $token)
        ));

        if ($meaningfulTokens !== [] && count($matchedTokens) === count($meaningfulTokens)) {
            $score = max($score, 95);
        } elseif (count($matchedTokens) >= 3) {
            $score = max($score, 75);
        }

        return $score;
    }

    private static function compactVariants(string $value): array
    {
        $normalized = Str::lower(Str::ascii($value));
        $baseVariants = [
            $normalized,
            preg_replace('/\bf\s*\/?\s*\d+(?:\.\d+)?\b/u', '', $normalized) ?? $normalized,
        ];

        $variants = [];
        $queue = array_map(self::compactString(...), $baseVariants);

        while ($queue !== []) {
            $variant = array_shift($queue);

            if ($variant === '' || in_array($variant, $variants, true)) {
                continue;
            }

            $variants[] = $variant;

            foreach (['canon', 'sony', 'fujifilm', 'fujinon', 'nikon', 'nikkor', 'lensa'] as $brand) {
                if (Str::startsWith($variant, $brand)) {
                    $queue[] = Str::after($variant, $brand);
                }
            }

            if (Str::contains($variant, 'mount')) {
                $queue[] = str_replace('mount', '', $variant);
            }
        }

        return $variants;
    }

    private static function compactString(string $value): string
    {
        return (string) preg_replace('/[^a-z0-9]+/', '', Str::lower(Str::ascii($value)));
    }

    private static function meaningfulTokens(string $compact): array
    {
        preg_match_all('/[a-z]+|\d+/', $compact, $matches);

        return array_values(array_filter(
            $matches[0] ?? [],
            fn ($token) => strlen($token) >= 2 || ctype_digit($token)
        ));
    }

    private static function extensionPriority(string $extension): int
    {
        return match (strtolower($extension)) {
            'png' => 1,
            'jpg', 'jpeg' => 2,
            'webp' => 3,
            default => 9,
        };
    }

    private static function brandVariants(string $brand): array
    {
        $brandCompact = self::compactString($brand);

        return match ($brandCompact) {
            'canon' => ['canon'],
            'sony' => ['sony'],
            'fujifilm' => ['fujifilm', 'fujinon'],
            'nikon' => ['nikon', 'nikkor'],
            default => array_values(array_filter([$brandCompact])),
        };
    }
}