<?php

namespace App\Http\Controllers;

use App\Models\Story;
use Illuminate\Http\JsonResponse;

class StoryController extends Controller
{
    public function index(): JsonResponse
    {
        $activeStories = Story::active()->get();

        $grouped = $activeStories->groupBy('user_id')->map(function ($items) {
            $first = $items->first();
            return [
                'username' => $first->username,
                'profile_pic_url' => $first->profile_pic_url,
                'is_unread' => $items->contains(fn ($item) => $item->viewed_at === null),
                'muted' => $first->muted,
                'soonest_expiring_at' => $items->min('expiring_at'),
            ];
        });

        $sorted = $grouped
            ->sortBy(fn ($s) => [$s['muted'] ? 1 : 0, $s['is_unread'] ? 0 : 1, $s['soonest_expiring_at']])
            ->values()
            ->map(fn ($s) => [
                'username' => $s['username'],
                'profile_pic_url' => $s['profile_pic_url'],
                'is_unread' => $s['is_unread'],
                'muted' => $s['muted'],
            ]);
        return response()->json($sorted);
    }

    public function show(string $username): JsonResponse
    {
        $items = Story::where('username', $username)->active()->orderBy('taken_at')->get();

        if ($items->isEmpty()) {
            return response()->json(['message' => 'No active story found.'], 404);
        }

        $firstUnread = $items->first(fn ($item) => $item->viewed_at === null);

        $startIndex = $firstUnread
            ? $items->search(fn ($item) => $item->id === $firstUnread->id)
            : 0;

        return response()->json([
            'username' => $username,
            'profile_pic_url' => $items->first()->profile_pic_url,
            'start_index' => $startIndex,
            'items' => $items->map(fn (Story $item) => [
                'id' => $item->id,
                'code' => $item->code,
                'is_video' => $item->is_video,
                'image_url' => $item->image_url,
                'video_url' => $item->video_url,
                'accessibility_caption' => $item->accessibility_caption,
                'taken_at' => $item->taken_at,
            ]),
        ]);
    }

    public function markViewed(string $id): JsonResponse
    {
        Story::where('id', $id)->update(['viewed_at' => now()]);
        return response()->json(['ok' => true]);
    }
}