require 'dotenv/load'
require 'sequel'
require 'sinatra'

require_relative '../lib/auth'
require_relative '../lib/search'

class VLVSearch < Sinatra::Base
  enable :sessions

  get '/' do
    redirect '/login' unless signed_in?
    params[:type] = 'threads'
    erb :index, { locals: params, layout: :layout }
  end

  get '/search' do
    redirect '/login' unless signed_in?
    params[:type] = 'threads' unless params[:type]
    params[:page] = 1 unless params[:page]
    params[:page] = params[:page].to_i

    results = search(params)
    previous_url, next_url = build_urls(params)

    locals =
      params.merge(
        results: results, previous_url: previous_url, next_url: next_url
      )

    erb :results, { locals: locals, layout: :layout }
  end

  get '/login' do
    erb :login, { layout: :layout, locals: { error_message: nil } }
  end

  post '/login' do
    username = params[:username]
    password = params[:password]
    cookie = login(username, password)

    if cookie.nil?
      erb :login,
          { layout: :layout, locals: { error_message: 'Invalid credentials' } }
    else
      session[:user_id] = username
      redirect '/'
    end
  end

  post '/logout' do
    session[:user_id] = nil
    redirect '/'
  end

  helpers do
    def build_urls(params)
      current_page = params[:page].to_i
      previous_page = current_page > 1 ? current_page - 1 : nil
      next_page = current_page + 1

      url_params = { q: params[:q], type: params[:type] }
      url_params[:username] = params[:username] if params[:username]

      [previous_page, next_page].map do |page|
        URI::Generic.build(
          path: '/search',
          query: URI.encode_www_form(url_params.merge(page: page))
        )
      end
    end

    def current_user
      session[:user_id]
    end

    def signed_in?
      !!session[:user_id]
    end

    run!
  end
end