<?php

use GuzzleHttp\Client;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Route;
use Illuminate\Support\Facades\Storage;

Route::get('/past-trips', function () {
    return view('past-trips');
});

Route::get('/{tripId?}', function (Request $request, $tripId = null) {
    if (!$tripId && !config('app.current_trip_id')) return view('no-trip');

    $viewMode = $request->input('show', null);

    // If there is a file in the local cache that is less than 1–3 hours old
    // (depending on whether it was actively tracking at last check), use that.
    $tripFileName = ( $tripId ?? config('app.current_trip_id') ) . '.json';

    if (Storage::disk('local')->exists($tripFileName)) {
        Log::debug("Cached trip file '{$tripFileName}' found...");
        $cachedData = json_decode(Storage::disk('local')->get($tripFileName))->trip;

        if ($cachedData->is_active) {
            Log::debug("Cached trip file '{$tripFileName}' is for an active trip.");

            $cachedDataUpdatedAt = new DateTime($cachedData->updated_at);
            $now = new DateTime();
            $cachingTimeout = ($cachedData->is_tracking) ? 1 : 3;
            $cachedDataAge = intval(($now->getTimestamp() - $cachedDataUpdatedAt->getTimestamp()) / 3600);

            if ($cachedDataAge <= $cachingTimeout) {
                Log::debug("Cached trip file '{$tripFileName}' is younger than {$cachingTimeout} hours, showing from cache...");
                return view('tracker', ['trip' => $cachedData, 'showAllCheckins' => ($viewMode === 'all')]);
            }
        } else {
            Log::debug("Cached trip file '{$tripFileName}' is for an old trip, showing from cache...");
            return view('tracker', ['trip' => $cachedData, 'showAllCheckins' => ($viewMode === 'all')]);
        }
    }

    /*
     * Otherwise, download the latest tracking data.
     */
    Log::debug("No cached trip file found for '{$tripFileName}'.");
    $client = new Client([
        'base_uri' => 'https://app.wayward.travel/',
        'timeout' => 3.0
    ]);
    $response = $client->get('trip/'.($tripId ?? config('app.current_trip_id')).'/user/zmld8ko6qy7d9j3xvq10/json');

    if ($response->getStatusCode() == 200) {
        $data = json_decode($response->getBody());

        // Cache the downloaded file if it does not exist locally.
        if (Storage::disk('local')->missing($tripFileName)) {
            Log::debug("Caching new trip file '{$tripFileName}'.");
            Storage::disk('local')->put($tripFileName, json_encode($data));
        } else {
            $cachedData = json_decode(Storage::disk('local')->get($tripFileName));
            if ($data->trip->updated_at !== $cachedData->trip->updated_at) {
                Log::debug("Cached trip file '{$tripFileName}' has different 'updated_at' time, updating cache...");
                Storage::disk('local')->put($tripFileName, json_encode($data));
                // TODO: Cache photos locally
            } else {
                Log::debug("Cached trip file '{$tripFileName}' has same 'updated_at' time, showing from cache...");
                $data = $cachedData;
            }
        }

        return view('tracker', ['trip' => $data->trip, 'showAllCheckins' => ($viewMode === 'all')]);
    } else {
        // TODO: Return proper error
        return 'Something went wrong';
    }
})->where('tripId', '[0-9a-z]{20}');