<?php

namespace App\Http\Controllers;

use Laravel\Lumen\Routing\Controller as BaseController;
use Illuminate\Http\Request;
use DB;

class Controller extends BaseController
{
  private static function displayURL() {
    return preg_replace('/(^https?:\/\/|\/$)/', '', session('me'));
  }

  public function index(Request $request) {
    if(session('user_id')) {

      $databases = DB::select('SELECT d.*
        FROM `databases` d
        JOIN database_users u ON d.id = u.database_id
        WHERE u.user_id = ?
        ORDER BY name', [session('user_id')]);

      return view('dashboard', [
        'displayURL' => self::displayURL(),
        'databases' => $databases
      ]);
    } else {
      return view('index');
    }
  }

  public function createDatabase(Request $request) {
    if(!session('user_id'))
      return redirect('/');

    if($request->input('name') == '') {
      $request->session()->flash('create-error', 'Enter a name.');
      return redirect('/');
    }

    // Only alphanumeric chars are allowed
    if(preg_replace('/[^a-zA-Z0-9]/', '', $request->input('name')) != $request->input('name')) {
      $request->session()->flash('create-error', 'Only alphanumeric characters are allowed.');
      $request->session()->flash('database-name', preg_replace('/[^a-zA-Z0-9]/','',$request->input('name')));
      return redirect('/');
    }

    // Check for conflicts
    $db = DB::select('SELECT * FROM `databases` WHERE name = ?', [$request->input('name')]);
    if(count($db) == 0) {

      // Create the database records
      $id = DB::table('databases')->insertGetId([
        'name' => $request->input('name'),
        'read_token' => str_random(40),
        'write_token' => str_random(40),
        'created_by' => session('user_id'),
        'created_at' => date('Y-m-d H:i:s')
      ]);
      DB::table('database_users')->insert([
        'database_id' => $id,
        'user_id' => session('user_id'),
        'created_at' => date('Y-m-d H:i:s')
      ]);
      return redirect('/');

    } else {
      $request->session()->flash('create-error', 'That database name is already in use.');
      $request->session()->flash('database-name', $request->input('name'));
      return redirect('/');
    }
  }

  public function map(Request $request, $name) {
    if(!session('user_id'))
      return redirect('/');

    // Verify this user has access to the database
    $db = DB::table('databases')
      ->where('created_by','=',session('user_id'))
      ->where('name','=',$name)
      ->first();
    if(!$db)
      return redirect('/');


    return view('map', [
      'displayURL' => self::displayURL(),
      'database' => $db,
    ]);
  }

  public function settings(Request $request, $name) {
    if(!session('user_id'))
      return redirect('/');

    // Only the person that created the database can modify it
    $db = DB::table('databases')
      ->where('created_by','=',session('user_id'))
      ->where('name','=',$name)
      ->first();
    if(!$db)
      return redirect('/');

    $users = DB::select('SELECT u.*
      FROM users u
      JOIN database_users d ON u.id = d.user_id
      WHERE d.database_id = ?
      ORDER BY u.url', [$db->id]);

    return view('settings', [
      'displayURL' => self::displayURL(),
      'database' => $db,
      'users' => $users
    ]);
  }

  public function updateSettings(Request $request, $name) {
    if(!session('user_id'))
      return redirect('/');

    // Only the person that created the database can modify it
    $db = DB::table('databases')
      ->where('created_by','=',session('user_id'))
      ->where('name','=',$name)
      ->first();
    if(!$db)
      return redirect('/');
    
    if($request->input('remove_user')) {

      $user = DB::table('users')->where('url','=',$request->input('remove_user'))->first();
      if($user) {
        DB::table('database_users')->where('database_id','=',$db->id)->where('user_id','=',$user->id)->delete();
      }

      return json_encode([
        'result' => 'ok'
      ]);

    } else if($request->input('add_user')) {
      // Find user if it exists already
      $user = DB::table('users')->where('url','=',$request->input('add_user'))->first();
      if($user) {
        $user_id = $user->id;
      } else {
        $user_id = DB::table('users')->insertGetId([
          'url' => $request->input('add_user'),
          'created_at' => date('Y-m-d H:i:s')
        ]);
      }

      // Add access to the database
      $exists = DB::table('database_users')->where('database_id','=',$db->id)->where('user_id','=',$user_id)->first();
      if(!$exists) {
        DB::table('database_users')->insert([
          'database_id' => $db->id,
          'user_id' => $user_id,
          'created_at' => date('Y-m-d H:i:s')
        ]);
      }

      return redirect('/settings/'.$db->name);
    }
  }

}