<?php

namespace App\Controllers;

use App\Element\ElementRepository;
use App\Exceptions\BadRequestException;
use App\Exceptions\NotFoundException;
use App\Set\Set as DomainSet;
use App\Set\SetRepository;
use App\Set\UseCases\CreateSetWithRoot\CreateSetWithRoot;
use App\Set\UseCases\CreateSetWithRoot\CreateSetWithRootRequest;
use App\Set\UseCases\DeleteSet\DeleteSet;
use App\Set\UseCases\DeleteSet\DeleteSetRequest;
use App\Set\UseCases\ReorderSets\ReorderSets;
use App\Set\UseCases\ReorderSets\ReorderSetsRequest;
use App\Set\UseCases\UpdateSet\UpdateSet;
use App\Set\UseCases\UpdateSet\UpdateSetRequest;
use App\Shared\Files\Filesystem;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Http\UploadedFile;

class SetController
{
    public function __construct(
        private SetRepository $setRepository,
        private ElementRepository $elementRepository,
        private CreateSetWithRoot $createSetWithRoot,
        private UpdateSet $updateSet,
        private DeleteSet $deleteSet,
        private ReorderSets $reorderSets,
        private Filesystem $filesystem,
    ) {
    }

    public function index(): JsonResponse
    {
        return new JsonResponse([
            'sets' => $this->buildSetPayloads(
                $this->setRepository->getAll(),
            ),
        ], 200);
    }

    public function reorder(Request $request): JsonResponse
    {
        try {
            $sets = $this->reorderSets->execute(new ReorderSetsRequest(
                setIds: $this->intArrayInput($request, 'setIds'),
            ));
        } catch (BadRequestException $exception) {
            return new JsonResponse([
                'error' => $exception->getMessage(),
            ], 400);
        }

        return new JsonResponse([
            'sets' => $this->buildSetPayloads($sets),
        ], 200);
    }

    public function create(Request $request): JsonResponse
    {
        $iconImage = $this->uploadedFileInput($request, 'iconImage');

        try {
            $set = $this->createSetWithRoot->execute(
                new CreateSetWithRootRequest(
                    name: $this->stringInput($request, 'name'),
                    description: $this->stringInput($request, 'description'),
                    iconImageContents: $iconImage['contents'],
                    iconImageOriginalName: $iconImage['originalName'],
                    iconImageMimeType: $iconImage['mimeType'],
                    iconImageSizeBytes: $iconImage['sizeBytes'],
                )
            );
        } catch (BadRequestException $exception) {
            return new JsonResponse([
                'error' => $exception->getMessage(),
            ], 400);
        }

        return new JsonResponse([
            'set' => $this->buildSetPayload($set),
        ], 201);
    }

    public function update(Request $request, ?int $id): JsonResponse
    {
        $iconImage = $this->uploadedFileInput($request, 'iconImage');

        try {
            $set = $this->updateSet->execute(
                new UpdateSetRequest(
                    id: $id,
                    name: $this->stringInput($request, 'name'),
                    description: $this->stringInput($request, 'description'),
                    iconImageContents: $iconImage['contents'],
                    iconImageOriginalName: $iconImage['originalName'],
                    iconImageMimeType: $iconImage['mimeType'],
                    iconImageSizeBytes: $iconImage['sizeBytes'],
                )
            );
        } catch (BadRequestException $exception) {
            return new JsonResponse([
                'error' => $exception->getMessage(),
            ], 400);
        } catch (NotFoundException $exception) {
            return new JsonResponse([
                'error' => $exception->getMessage(),
            ], 404);
        }

        return new JsonResponse([
            'set' => $this->buildSetPayload($set),
        ], 200);
    }

    public function delete(?int $id): JsonResponse
    {
        try {
            $this->deleteSet->execute(new DeleteSetRequest(id: $id));
        } catch (BadRequestException $exception) {
            return new JsonResponse([
                'error' => $exception->getMessage(),
            ], 400);
        } catch (NotFoundException $exception) {
            return new JsonResponse([
                'error' => $exception->getMessage(),
            ], 404);
        }

        return new JsonResponse(null, 204);
    }

    /**
     * @return array{
     *     id: int,
     *     name: string,
     *     description: string,
     *     iconImageUrl: string,
     *     rootElementId: int|null
     * }
     */
    private function buildSetPayload(DomainSet $set): array
    {
        $rootElement = $this->elementRepository->findRootBySet($set);

        return [
            'id' => $set->getId(),
            'name' => $set->getName(),
            'description' => $set->getDescription(),
            'iconImageUrl' => $this->storageUrl(
                $set->getIconImageUrl(),
                'set-icons/',
            ),
            'rootElementId' => $rootElement?->getId(),
        ];
    }

    /**
     * @param DomainSet[] $sets
     * @return array<int, array{
     *     id: int,
     *     name: string,
     *     description: string,
     *     iconImageUrl: string,
     *     rootElementId: int|null
     * }>
     */
    private function buildSetPayloads(array $sets): array
    {
        $setPayloads = [];
        foreach ($sets as $set) {
            $setPayloads[] = $this->buildSetPayload($set);
        }

        return $setPayloads;
    }

    /**
     * @return int[]|null
     */
    private function intArrayInput(Request $request, string $key): ?array
    {
        if (! $request->exists($key)) {
            return null;
        }

        $value = $request->input($key);
        if (! is_array($value)) {
            return null;
        }

        $integerValues = [];
        foreach ($value as $item) {
            if (is_int($item)) {
                $integerValues[] = $item;
                continue;
            }

            if (is_string($item) && ctype_digit($item)) {
                $integerValues[] = (int) $item;
                continue;
            }

            return null;
        }

        return $integerValues;
    }

    private function stringInput(Request $request, string $key): ?string
    {
        if (! $request->exists($key)) {
            return null;
        }

        $value = $request->input($key);
        if ($value === null) {
            return '';
        }

        if (! is_string($value)) {
            return null;
        }

        return $value;
    }

    /**
     * @return array{
     *     contents: string|null,
     *     originalName: string|null,
     *     mimeType: string|null,
     *     sizeBytes: int|null
     * }
     */
    private function uploadedFileInput(Request $request, string $key): array
    {
        $emptyFileInput = [
            'contents' => null,
            'originalName' => null,
            'mimeType' => null,
            'sizeBytes' => null,
        ];

        if (! $request->hasFile($key)) {
            return $emptyFileInput;
        }

        $file = $request->file($key);
        if (! $file instanceof UploadedFile) {
            return $emptyFileInput;
        }

        $realPath = $file->getRealPath();
        if ($realPath === false) {
            return $emptyFileInput;
        }

        return [
            'contents' => (string) file_get_contents($realPath),
            'originalName' => $file->getClientOriginalName(),
            'mimeType' => (string) $file->getMimeType(),
            'sizeBytes' => (int) $file->getSize(),
        ];
    }

    private function storageUrl(string $path, string $folderPrefix): string
    {
        if (str_starts_with($path, $folderPrefix)) {
            return $this->filesystem->url($path);
        }

        return $path;
    }
}