package com.juick.www.controllers;

import com.juick.User;
import com.juick.server.util.HttpNotFoundException;
import com.juick.service.UserService;
import com.juick.util.UserUtils;
import org.springframework.core.io.ClassPathResource;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.inject.Inject;
import java.io.IOException;
import java.net.URISyntaxException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.Principal;
import java.util.Optional;
import java.util.stream.Collectors;

/**
 * Created by aalexeev on 11/21/16.
 */
@Controller
public class HelpController {
    @Inject
    UserService userService;

    @RequestMapping({"/help", "/help/{lang}", "/help/{lang}/{page}"})
    protected String doGetHelp(
            Principal principal,
            @PathVariable("lang") Optional<String> lang,
            @PathVariable("page") Optional<String> page,
            ModelMap model) throws IOException, URISyntaxException {
        String name = UserUtils.getUsername(principal, null);
        User visitor = userService.getUserByName(name);

        lang.ifPresent(l -> {
            if (l.length() != 2 || !l.matches("^[a-z]+$")) {
                throw new HttpNotFoundException();
            }
        });
        if (!lang.isPresent()) {
            lang = Optional.of("ru");
        }

        page.ifPresent(p -> {
            if (!p.matches("^[a-zA-Z0-9\\-]*$") || p.equals("navigation") || p.equals("index")) {
                throw new HttpNotFoundException();
            }
        });
        if (!page.isPresent()) {
            page = Optional.of("index");
        }

        String filePath = "help/" + lang.get() + "/" + page.get();
        String navigationPath = "help/" + lang.get() + "/navigation";

        model.addAttribute("title", "Помощь");
        model.addAttribute("visitor", visitor);
        model.addAttribute("help_nav", Files.readAllLines(Paths.get(new ClassPathResource(navigationPath).getURI()))
                .stream().collect(Collectors.joining()));
        model.addAttribute("help_data", Files.readAllLines(Paths.get(new ClassPathResource(filePath).getURI()))
                .stream().collect(Collectors.joining()));
        return "views/help";
    }
}