<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Http\Resources\UrlCollection;
use App\Http\Resources\UrlHistoryCollection;
use App\Http\Resources\UrlResource;
use App\Http\Resources\UrlStatsCollection;
use App\Models\Url;
use DateTime;
use Illuminate\Http\Request;

class UrlController extends Controller
{
    /**
     * Returns a listing of the urls.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
        return new UrlCollection(Url::paginate(25));
    }

    /**
     * Returns the specified url.
     *
     * @param  Url $url
     * @return \Illuminate\Http\Response
     */
    public function show(Url $url)
    {
        return new UrlResource($url);
    }

    /**
     * Returns the history for a given url.
     *
     * @param Url     $url
     * @param Request $request
     * @return \Illuminate\Http\Response
     */
    public function getHistory(Url $url, Request $request)
    {
        // Set start date with request or now - 1 year.
        if ($request->input('start')) {
            $start = $request->input('start');
            $start = DateTime::createFromFormat('dmY', $start);
        } else {
            $start = now()->modify('-1 year');
        }
        // Set end date with request or now.
        if ($request->input('end')) {
            $end = $request->input('end');
            $end = DateTime::createFromFormat('dmY', $end)->modify('+1 day');
        } else {
            $end = now();
        }
        // Check if the difference bewteen end and start is < than 1 year.
        if ($start->diff($end)->days > 366) {
            return response('Date interval too long', 403);
        };
        $history = $url->history()
            ->where('start_date', '>', $start)
            ->where('end_date', '<', $end)
            ->get();
        return new UrlHistoryCollection($history);
    }

    /**
     * Returns the stats for the given url.
     *
     * @param Url     $url
     * @param Request $request
     * @return \Illuminate\Http\Response
     */
    public function getstats(Url $url, Request $request)
    {
        // Set start date with request or now - 1 year.
        if ($request->input('start')) {
            $start = $request->input('start');
            $start = DateTime::createFromFormat('dmY', $start);
        } else {
            $start = now()->modify('-1 year');
        }
        // Set end date with request or now.
        if ($request->input('end')) {
            $end = $request->input('end');
            $end = DateTime::createFromFormat('dmY', $end)->modify('+1 day');
        } else {
            $end = now();
        }
        // Check if the difference bewteen end and start is < than 1 year.
        if ($start->diff($end)->days > 366) {
            return response('Date interval too long', 403);
        };
        $stats = $url->stats()
            ->whereBetween('date', [$start, $end])
            ->get();
        return new UrlStatsCollection($stats);
    }
}