<?php
namespace App\Services\Support;

use App\Models\TicketAttachment;
use Illuminate\Http\UploadedFile;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;
use Livewire\Features\SupportFileUploads\TemporaryUploadedFile;

class TicketAttachmentUploadService
{
    /**
     * @param  UploadedFile|TemporaryUploadedFile  $file
     * @return array<string,mixed>
     */
    public function inspectUpload(object $file): array
    {
        return $this->extractImageMetadataFromFileObject($file);
    }

    /**
     * @param  UploadedFile|TemporaryUploadedFile  $file
     * @return array{path:string,mime:string,size:int,original_name:string}
     */
    public function store(object $file, string $directory, array $options = []): array
    {
        $originalName = method_exists($file, 'getClientOriginalName')
            ? (string) $file->getClientOriginalName()
            : 'file';

        $extension      = strtolower((string) pathinfo($originalName, PATHINFO_EXTENSION));
        $storedBasename = trim((string) ($options['stored_basename'] ?? ''));
        $displayName    = trim((string) ($options['display_name'] ?? ''));

        if ($storedBasename !== '') {
            $sanitizedBase = trim((string) Str::of(pathinfo($storedBasename, PATHINFO_FILENAME))->slug('-'), '-');
            $sanitizedBase = $sanitizedBase !== '' ? $sanitizedBase : 'file';
            $storedName    = $sanitizedBase . ($extension !== '' ? '.' . $extension : '');
            $path          = $file->storeAs($directory, $storedName, 'public');
        } else {
            $path       = $file->store($directory, 'public');
            $storedName = basename($path);
        }

        if ($displayName === '') {
            $displayName = $originalName !== '' ? $originalName : ($storedName !== '' ? $storedName : 'file');
        }

        $sourceMetadata = $this->extractImageMetadataFromFileObject($file);

        $mime = TicketAttachment::normalizeMimeType(
            method_exists($file, 'getClientMimeType') ? (string) $file->getClientMimeType() : '',
            $originalName,
            $path,
        );

        $metadata = [];

        if (str_starts_with($mime, 'image/')) {
            $metadata = $this->mergeImageMetadata(
                $this->extractImageMetadata($path),
                $sourceMetadata,
            );
            if ($this->shouldOptimizeImage($metadata, $options)) {
                $this->optimizeImage($path, $mime, $metadata);
            }
            $mime = TicketAttachment::normalizeMimeType($mime, $originalName, $path);
        }

        $size = 0;
        try {
            $size = (int) Storage::disk('public')->size($path);
        } catch (\Throwable) {
            $size = (int) (method_exists($file, 'getSize') ? $file->getSize() : 0);
        }

        return [
            'path'                 => $path,
            'mime'                 => $mime,
            'size'                 => $size,
            'original_name'        => $displayName,
            'source_original_name' => $originalName,
            'stored_name'          => $storedName,
            'metadata'             => $metadata,
        ];
    }

    /**
     * @return array{path:string,mime:string,size:int,original_name:string,source_original_name:string,stored_name:string,metadata:array<string,mixed>}
     */
    public function storeRawContents(string $contents, string $directory, string $originalName, array $options = []): array
    {
        $extension      = strtolower((string) pathinfo($originalName, PATHINFO_EXTENSION));
        $storedBasename = trim((string) ($options['stored_basename'] ?? ''));
        $displayName    = trim((string) ($options['display_name'] ?? '')) ?: $originalName;

        $sanitizedBase = trim((string) Str::of(pathinfo($storedBasename !== '' ? $storedBasename : $displayName, PATHINFO_FILENAME))->slug('-'), '-');
        $sanitizedBase = $sanitizedBase !== '' ? $sanitizedBase : 'file';
        $storedName    = $sanitizedBase . ($extension !== '' ? '.' . $extension : '');
        $path          = trim($directory, '/') . '/' . $storedName;

        Storage::disk('public')->put($path, $contents);

        $mime     = TicketAttachment::normalizeMimeType((string) ($options['mime'] ?? ''), $originalName, $path);
        $metadata = [];

        if (str_starts_with($mime, 'image/')) {
            $metadata = $this->extractImageMetadata($path);
            if ($this->shouldOptimizeImage($metadata, $options)) {
                $this->optimizeImage($path, $mime, $metadata);
            }
            $mime = TicketAttachment::normalizeMimeType($mime, $originalName, $path);
        }

        return [
            'path'                 => $path,
            'mime'                 => $mime,
            'size'                 => (int) Storage::disk('public')->size($path),
            'original_name'        => $displayName,
            'source_original_name' => $originalName,
            'stored_name'          => $storedName,
            'metadata'             => $metadata,
        ];
    }

    private function shouldOptimizeImage(array $metadata, array $options = []): bool
    {
        if (array_key_exists('optimize_image', $options)) {
            return (bool) $options['optimize_image'];
        }

        return ! $this->hasEmbeddedImageMetadata($metadata);
    }

    private function mergeImageMetadata(array $storedMetadata, array $sourceMetadata): array
    {
        $merged = $storedMetadata;

        foreach ($sourceMetadata as $key => $value) {
            if (is_array($value)) {
                if ($value === []) {
                    continue;
                }

                $merged[$key] = array_replace(is_array($merged[$key] ?? null) ? $merged[$key] : [], $value);
                continue;
            }

            if ($value === null || $value === '') {
                continue;
            }

            $merged[$key] = $value;
        }

        return $merged;
    }

    private function hasEmbeddedImageMetadata(array $metadata): bool
    {
        return filled($metadata['exif_datetime'] ?? null)
        || filled($metadata['device'] ?? null)
        || isset($metadata['gps_decimal'])
            || ((int) ($metadata['orientation'] ?? 1)) !== 1;
    }

    private function optimizeImage(string $path, string $mime, array $metadata = []): void
    {
        $absolutePath = Storage::disk('public')->path($path);
        if (! is_file($absolutePath) || ! function_exists('getimagesize')) {
            return;
        }

        $source = $this->createImageResource($absolutePath, $mime);
        if (! $source) {
            return;
        }

        $source = $this->applyOrientation($source, (int) ($metadata['orientation'] ?? 1));
        $width  = imagesx($source);
        $height = imagesy($source);

        if ($width <= 0 || $height <= 0) {
            imagedestroy($source);
            return;
        }

        $maxWidth  = 1600;
        $maxHeight = 1600;
        $ratio     = min($maxWidth / $width, $maxHeight / $height, 1);
        $targetW   = (int) max(1, round($width * $ratio));
        $targetH   = (int) max(1, round($height * $ratio));

        $target = imagecreatetruecolor($targetW, $targetH);
        if ($target === false) {
            imagedestroy($source);
            return;
        }

        if (in_array($mime, ['image/png', 'image/webp'], true)) {
            imagealphablending($target, false);
            imagesavealpha($target, true);
            $transparent = imagecolorallocatealpha($target, 255, 255, 255, 127);
            imagefilledrectangle($target, 0, 0, $targetW, $targetH, $transparent);
        }

        imagecopyresampled($target, $source, 0, 0, 0, 0, $targetW, $targetH, $width, $height);

        switch ($mime) {
            case 'image/png':
                imagepng($target, $absolutePath, 6);
                break;
            case 'image/webp':
                if (function_exists('imagewebp')) {
                    imagewebp($target, $absolutePath, 82);
                }
                break;
            default:
                imagejpeg($target, $absolutePath, 82);
                break;
        }

        imagedestroy($target);
        imagedestroy($source);
    }

    private function createImageResource(string $absolutePath, string $mime)
    {
        return match ($mime) {
            'image/png'  => function_exists('imagecreatefrompng') ? @imagecreatefrompng($absolutePath) : false,
            'image/webp' => function_exists('imagecreatefromwebp') ? @imagecreatefromwebp($absolutePath) : false,
            default      => function_exists('imagecreatefromjpeg') ? @imagecreatefromjpeg($absolutePath) : false,
        };
    }

    private function applyOrientation($source, int $orientation)
    {
        $angle = match ($orientation) {
            3       => 180,
            6       => 270,
            8       => 90,
            default => 0,
        };

        if ($angle === 0 || ! function_exists('imagerotate')) {
            return $source;
        }

        $rotated = @imagerotate($source, $angle, 0);
        if ($rotated === false) {
            return $source;
        }

        imagedestroy($source);

        return $rotated;
    }

    private function extractImageMetadata(string $path): array
    {
        $absolutePath = Storage::disk('public')->path($path);
        return $this->extractImageMetadataFromAbsolutePath($absolutePath);
    }

    private function extractImageMetadataFromFileObject(object $file): array
    {
        $absolutePath = null;

        if (method_exists($file, 'getRealPath')) {
            $absolutePath = $file->getRealPath();
        }

        if ((! is_string($absolutePath) || $absolutePath === '') && method_exists($file, 'path')) {
            $absolutePath = $file->path();
        }

        if (! is_string($absolutePath) || $absolutePath === '' || ! is_file($absolutePath)) {
            return [];
        }

        return $this->extractImageMetadataFromAbsolutePath($absolutePath);
    }

    private function extractImageMetadataFromAbsolutePath(string $absolutePath): array
    {
        $metadata = [];

        $imageSize = @getimagesize($absolutePath);
        if (is_array($imageSize)) {
            $metadata['width']  = $imageSize[0] ?? null;
            $metadata['height'] = $imageSize[1] ?? null;
            $metadata['mime']   = $imageSize['mime'] ?? null;
        }

        if (! function_exists('exif_read_data')) {
            return $metadata;
        }

        try {
            $exif = @exif_read_data($absolutePath);
            if (! is_array($exif)) {
                return $metadata;
            }

            $metadata['exif_datetime'] = $exif['DateTimeOriginal'] ?? ($exif['DateTime'] ?? null);
            $metadata['device']        = trim(implode(' ', array_filter([
                $exif['Make'] ?? null,
                $exif['Model'] ?? null,
            ])));
            $metadata['orientation'] = (int) ($exif['Orientation'] ?? 1);

            $lat = $this->gpsCoordinateToDecimal($exif['GPSLatitude'] ?? null, $exif['GPSLatitudeRef'] ?? null);
            $lng = $this->gpsCoordinateToDecimal($exif['GPSLongitude'] ?? null, $exif['GPSLongitudeRef'] ?? null);

            if ($lat !== null && $lng !== null) {
                $metadata['gps_decimal']     = ['lat' => $lat, 'lng' => $lng];
                $metadata['google_maps_url'] = 'https://maps.google.com/?q=' . $lat . ',' . $lng;
            }
        } catch (\Throwable) {
        }

        return $metadata;
    }

    private function gpsCoordinateToDecimal(mixed $coordinate, mixed $reference): ?float
    {
        if (! is_array($coordinate) || count($coordinate) < 3) {
            return null;
        }

        $degrees = $this->gpsValueToFloat($coordinate[0] ?? null);
        $minutes = $this->gpsValueToFloat($coordinate[1] ?? null);
        $seconds = $this->gpsValueToFloat($coordinate[2] ?? null);

        if ($degrees === null || $minutes === null || $seconds === null) {
            return null;
        }

        $decimal = $degrees + ($minutes / 60) + ($seconds / 3600);
        $ref     = strtoupper(trim((string) $reference));

        if (in_array($ref, ['S', 'W'], true)) {
            $decimal *= -1;
        }

        return round($decimal, 6);
    }

    private function gpsValueToFloat(mixed $value): ?float
    {
        if (is_numeric($value)) {
            return (float) $value;
        }

        $raw = trim((string) $value);
        if ($raw === '') {
            return null;
        }

        if (! str_contains($raw, '/')) {
            return is_numeric($raw) ? (float) $raw : null;
        }

        [$numerator, $denominator] = array_pad(explode('/', $raw, 2), 2, null);
        if (! is_numeric($numerator) || ! is_numeric($denominator) || (float) $denominator === 0.0) {
            return null;
        }

        return (float) $numerator / (float) $denominator;
    }
}