<?php

declare(strict_types=1);

namespace App\Http\Controllers\Api\V1;

use App\Http\Controllers\Api\V1\Concerns\ResolvesContent;
use App\Http\Controllers\Controller;
use App\Http\Resources\ReviewCommentResource;
use App\Models\User;
use App\Support\AdminContent;
use App\Support\ContentTypes;
use App\Support\Publisher;
use Carbon\CarbonImmutable;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Http\Resources\Json\AnonymousResourceCollection;
use Illuminate\Validation\ValidationException;

/**
 * The handover between writing something and putting it on the site — the
 * panel's review buttons, as calls. Pages, projects and services only: the
 * kinds with a separate `publish` permission.
 */
class ReviewController extends Controller
{
    use ResolvesContent;

    /**
     * What is waiting for the caller: everything awaiting review they could
     * answer, either addressed to them or to nobody in particular.
     */
    public function queue(Request $request): JsonResponse
    {
        $user = $request->user();
        $items = collect();

        foreach (array_keys(AdminContent::REVIEWABLE) as $resource) {
            $model = AdminContent::model($resource);

            if ($user->cannot("{$resource}.publish")) {
                continue;
            }

            $model::query()
                ->awaitingReviewBy($user)
                ->with(['reviewRequester', 'reviewer'])
                ->get()
                ->each(fn (Model $record) => $items->push($this->summary($resource, $record)));
        }

        return response()->json([
            'data' => $items->sortBy('requested_at')->values(),
        ]);
    }

    /**
     * The thread: requests, returns, publications and comments, newest first.
     */
    public function thread(Request $request): AnonymousResourceCollection
    {
        $record = $this->record($request);

        $this->authorize('view', $record);

        return ReviewCommentResource::collection(
            $record->reviewComments()->with('user')->paginate(perPage: min($request->integer('per_page', 25), 100)),
        );
    }

    /**
     * Ask for it to be reviewed — the only way somebody without the publish
     * permission has of putting their work live.
     */
    public function request(Request $request): JsonResponse
    {
        $record = $this->record($request);

        $this->authorize('update', $record);

        $data = $request->validate([
            'reviewer_id' => ['sometimes', 'nullable', 'integer', 'exists:users,id'],
            'note' => ['sometimes', 'nullable', 'string', 'max:2000'],
        ]);

        if ($record->isAwaitingReview() || $record->isPublishedNow()) {
            throw ValidationException::withMessages(['review' => [__('rules.reviews.not_requestable')]]);
        }

        $reviewer = isset($data['reviewer_id']) ? User::find($data['reviewer_id']) : null;

        if ($reviewer !== null && $reviewer->cannot($record->getTable().'.publish')) {
            throw ValidationException::withMessages(['reviewer_id' => [__('rules.reviews.not_a_reviewer')]]);
        }

        $record->requestReview($reviewer, $data['note'] ?? null, $request->user());

        return $this->answer($record);
    }

    /**
     * Send it back to whoever asked, saying why.
     */
    public function return(Request $request): JsonResponse
    {
        $record = $this->record($request);

        $this->authorize($record->getTable().'.publish');

        $data = $request->validate(['note' => ['required', 'string', 'max:2000']]);

        if (! $record->isAwaitingReview()) {
            throw ValidationException::withMessages(['review' => [__('rules.reviews.not_awaiting')]]);
        }

        $record->returnForChanges($data['note'], $request->user());

        return $this->answer($record);
    }

    public function comment(Request $request): JsonResponse
    {
        $record = $this->record($request);

        $this->authorize('view', $record);

        $data = $request->validate(['body' => ['required', 'string', 'max:2000']]);

        return ReviewCommentResource::make($record->comment($data['body'], $request->user())->load('user'))
            ->response()
            ->setStatusCode(201);
    }

    /**
     * Approve: on the site now, or from `at`. Either way the review, if there
     * was one, is answered.
     */
    public function publish(Request $request): JsonResponse
    {
        $record = $this->record($request);

        $this->authorize($record->getTable().'.publish');

        $data = $request->validate(['at' => ['sometimes', 'nullable', 'date']]);

        Publisher::publish($record, filled($data['at'] ?? null) ? CarbonImmutable::parse($data['at']) : null);

        return $this->answer($record);
    }

    public function unpublish(Request $request): JsonResponse
    {
        $record = $this->record($request);

        $this->authorize($record->getTable().'.publish');

        Publisher::unpublish($record);

        return $this->answer($record);
    }

    protected function answer(Model $record): JsonResponse
    {
        $record->refresh()->load(['reviewRequester', 'reviewer']);

        return response()->json(['data' => $this->summary(AdminContent::nameOf($record), $record)]);
    }

    /**
     * @return array<string, mixed>
     */
    protected function summary(string $resource, Model $record): array
    {
        return [
            'type' => $resource,
            'id' => $record->getKey(),
            'title' => ContentTypes::title($record),
            'published' => $record->isPublishedNow(),
            'published_at' => $record->published_at?->toIso8601String(),
            'awaiting_review' => $record->isAwaitingReview(),
            'requested_at' => $record->review_requested_at?->toIso8601String(),
            'requested_by' => $record->reviewRequester ? ['id' => $record->reviewRequester->id, 'name' => $record->reviewRequester->name] : null,
            'reviewer' => $record->reviewer ? ['id' => $record->reviewer->id, 'name' => $record->reviewer->name] : null,
        ];
    }
}