package com.juick.www.controllers;

import com.juick.server.util.WebUtils;
import com.juick.service.MessagesService;
import com.juick.service.UserService;
import org.apache.commons.lang3.math.NumberUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;
import org.springframework.web.servlet.support.ServletUriComponentsBuilder;
import org.springframework.web.util.UriComponents;

import javax.annotation.Nonnull;
import javax.inject.Inject;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Component
public class AnythingFilter extends OncePerRequestFilter {
    @Inject
    private MessagesService messagesService;
    @Inject
    private UserService userService;

    @Override
    public void doFilterInternal(@Nonnull HttpServletRequest servletRequest,
                                 @Nonnull HttpServletResponse servletResponse,
                                 @Nonnull FilterChain filterChain) throws IOException, ServletException {
        UriComponents components = ServletUriComponentsBuilder.fromCurrentRequestUri().build();
        String anything = components.getPath().substring(1);
        int before = NumberUtils.toInt(components.getQueryParams().getFirst("before"), 0);
        if (before == 0) {
            boolean isPostNumber = WebUtils.isPostNumber(anything);
            int messageId = isPostNumber ?
                    NumberUtils.toInt(anything) : 0;

            if (isPostNumber && anything.equals(Integer.toString(messageId))) {
                if (messageId > 0) {
                    com.juick.User author = messagesService.getMessageAuthor(messageId);

                    if (author != null) {
                        servletResponse.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
                        servletResponse.setHeader("Location", "/" + author.getName() + "/" + anything);
                        return;
                    }
                }
            }
            com.juick.User user = userService.getUserByName(anything);
            if (user.getUid() > 0) {
                ((HttpServletResponse)servletResponse).sendRedirect("/" + user.getName() + "/");
            } else {
                filterChain.doFilter(servletRequest, servletResponse);
            }
        } else {
            com.juick.User user = userService.getUserByName(anything);
            if (!user.isAnonymous()) {
                ((HttpServletResponse) servletResponse).sendRedirect("/" + user.getName() + "/?before=" + before);
            } else {
                filterChain.doFilter(servletRequest, servletResponse);
            }
        }
    }
}