package com.juick.server.api.activity;

import com.juick.User;
import com.juick.server.api.activity.model.*;
import com.juick.server.util.HttpNotFoundException;
import com.juick.server.util.UserUtils;
import com.juick.service.MessagesService;
import com.juick.service.UserService;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.support.ServletUriComponentsBuilder;
import org.springframework.web.util.UriComponentsBuilder;

import javax.inject.Inject;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;

@RestController
public class Profile {
    @Inject
    private UserService userService;
    @Inject
    private MessagesService messagesService;
    @Value("${web_domain:localhost}")
    private String domain;
    @Value("${ap_base_uri:http://localhost:8080/}")
    private String baseUri;
    @Value("${img_url:http://localhost:8080/i/}")
    private String baseImagesUri;

    @GetMapping(value = "/u/{userName}", produces = ActivityObject.CONTENT_TYPE)
    public Person getUser(@PathVariable String userName) {
        User user = userService.getUserByName(userName);
        if (!user.isAnonymous()) {
            UriComponentsBuilder uri = UriComponentsBuilder.fromUriString(baseUri);
            Person person = new Person();
            uri.replacePath(String.format("/u/%s", userName));
            person.setId(uri.toUriString());
            person.setName(userName);
            uri.replacePath("/post");
            person.setInbox(uri.toUriString());
            person.setOutbox(uri.replacePath(String.format("/u/%s/blog/toc", userName)).toUriString());
            person.setFollowers(uri.replacePath(String.format("/u/%s/followers/toc", userName)).toUriString());
            person.setFollowing(uri.replacePath(String.format("/u/%s/following/toc", userName)).toUriString());
            uri.replacePath(String.format("/a/%d.png", user.getUid()));
            Image avatar = new Image();
            avatar.setUrl(uri.toUriString());
            avatar.setMediaType("image/png");
            person.setIcon(avatar);
            return person;
        }
        throw new HttpNotFoundException();
    }
    @GetMapping(value = "/u/{userName}/blog/toc", produces = ActivityObject.CONTENT_TYPE)
    public OrderedCollection getOutbox(@PathVariable String userName) {
        User user = userService.getUserByName(userName);
        if (!user.isAnonymous()) {
            UriComponentsBuilder uriComponentsBuilder = UriComponentsBuilder.fromUriString(baseUri);
            OrderedCollection blog = new OrderedCollection();
            blog.setId(ServletUriComponentsBuilder.fromCurrentRequestUri().toUriString());
            blog.setTotalItems(userService.getStatsMessages(user.getUid()));
            Link first = new Link();
            uriComponentsBuilder.path(String.format("/u/%s/blog", userName));
            first.setHref(uriComponentsBuilder.toUriString());
            blog.setFirst(first);
            return blog;
        }
        throw new HttpNotFoundException();
    }
    @GetMapping(value = "/u/{userName}/blog", produces = ActivityObject.CONTENT_TYPE)
    public OrderedCollectionPage getOutboxPage(@PathVariable String userName,
                                           @RequestParam(required = false, defaultValue = "0") int before) {
        User visitor = UserUtils.getCurrentUser();
        User user = userService.getUserByName(userName);
        if (!user.isAnonymous()) {
            UriComponentsBuilder uriComponentsBuilder = UriComponentsBuilder.fromUriString(baseUri);
            uriComponentsBuilder.path(String.format("/u/%s/blog", userName));
            List<Integer> mids = messagesService.getUserBlog(user.getUid(), 0, before);
            List<Note> notes = messagesService.getMessages(visitor, mids).stream().map(m -> {
                Note note = new Note();
                note.setPublished(m.getTimestamp());
                note.setContent(m.getText());
                if (StringUtils.isNotBlank(m.getAttachmentType())) {
                    Link attachment = new Link();
                    attachment.setHref(m.getAttachment().getMedium().getUrl());
                    note.setAttachment(attachment);
                }
                return note;
            }).collect(Collectors.toList());
            Person person = new Person();
            person.setName(user.getName());
            OrderedCollectionPage page = new OrderedCollectionPage();
            page.setId(ServletUriComponentsBuilder.fromCurrentRequestUri().toUriString());
            page.setOrderedItems(notes.stream().map(a -> {
                Create create = new Create();
                create.setActor(person);
                create.setObject(a);
                create.setPublished(a.getPublished());
                return create;
            }).collect(Collectors.toList()));
            int beforeNext = mids.stream().reduce((fst, second) -> second).orElse(0);
            if (beforeNext > 0) {
                Link next = new Link();
                next.setHref(uriComponentsBuilder.queryParam("before", beforeNext).toUriString());
                page.setNext(next);
            }
            return page;
        }
        throw new HttpNotFoundException();
    }
    @GetMapping(value = "/u/{userName}/followers/toc", produces = ActivityObject.CONTENT_TYPE)
    public OrderedCollection getFollowers(@PathVariable String userName) {
        User user = userService.getUserByName(userName);
        if (!user.isAnonymous()) {
            UriComponentsBuilder uriComponentsBuilder = UriComponentsBuilder.fromUriString(baseUri);
            OrderedCollection followers = new OrderedCollection();
            followers.setId(ServletUriComponentsBuilder.fromCurrentRequestUri().toUriString());
            followers.setTotalItems(userService.getStatsMyReaders(user.getUid()));
            Link first = new Link();
            uriComponentsBuilder.path(String.format("/u/%s/followers", userName));
            first.setHref(uriComponentsBuilder.toUriString());
            followers.setFirst(first);
            return followers;
        }
        throw new HttpNotFoundException();
    }
    @GetMapping(value = "/u/{userName}/followers", produces = ActivityObject.CONTENT_TYPE)
    public OrderedCollectionPage getFollowersPage(@PathVariable String userName,
                                               @RequestParam(required = false, defaultValue = "0") int page) {
        User user = userService.getUserByName(userName);
        if (!user.isAnonymous()) {
            UriComponentsBuilder uriComponentsBuilder = UriComponentsBuilder.fromUriString(baseUri);
            uriComponentsBuilder.path(String.format("/u/%s/followers", userName));
            List<User> followers = userService.getUserReaders(user.getUid());
            Stream<User> followersPage = followers.stream().skip(20 * page).limit(20);

            Person person = new Person();
            person.setName(user.getName());
            OrderedCollectionPage result = new OrderedCollectionPage();
            result.setId(ServletUriComponentsBuilder.fromCurrentRequestUri().toUriString());
            result.setOrderedItems(followersPage.map(a -> {
                Person follower = new Person();
                follower.setName(a.getName());
                Link url = new Link();
                url.setHref(uriComponentsBuilder.replacePath(String.format("/u/%s", a.getName())).toUriString());
                follower.setUrl(url);
                return follower;
            }).collect(Collectors.toList()));
            boolean hasNext = followers.size() <= 20 * page;
            if (hasNext) {
                Link next = new Link();
                next.setHref(uriComponentsBuilder.queryParam("page", page + 1).toUriString());
                result.setNext(next);
            }
            return result;
        }
        throw new HttpNotFoundException();
    }
    @GetMapping(value = "/u/{userName}/following/toc", produces = ActivityObject.CONTENT_TYPE)
    public OrderedCollection getFollowing(@PathVariable String userName) {
        User user = userService.getUserByName(userName);
        if (!user.isAnonymous()) {
            UriComponentsBuilder uriComponentsBuilder = UriComponentsBuilder.fromUriString(baseUri);
            OrderedCollection following = new OrderedCollection();
            following.setId(ServletUriComponentsBuilder.fromCurrentRequestUri().toUriString());
            following.setTotalItems(userService.getUserFriends(user.getUid()).size());
            Link first = new Link();
            uriComponentsBuilder.path(String.format("/u/%s/followers", userName));
            first.setHref(uriComponentsBuilder.toUriString());
            following.setFirst(first);
            return following;
        }
        throw new HttpNotFoundException();
    }
    @GetMapping(value = "/u/{userName}/following", produces = ActivityObject.CONTENT_TYPE)
    public OrderedCollectionPage getFollowingPage(@PathVariable String userName,
                                                  @RequestParam(required = false, defaultValue = "0") int page) {
        User user = userService.getUserByName(userName);
        if (!user.isAnonymous()) {
            UriComponentsBuilder uriComponentsBuilder = UriComponentsBuilder.fromUriString(baseUri);
            uriComponentsBuilder.path(String.format("/u/%s/following", userName));
            List<User> following = userService.getUserFriends(user.getUid());
            Stream<User> followingPage = following.stream().skip(20 * page).limit(20);

            Person person = new Person();
            person.setName(user.getName());
            OrderedCollectionPage result = new OrderedCollectionPage();
            result.setId(ServletUriComponentsBuilder.fromCurrentRequestUri().toUriString());
            result.setOrderedItems(followingPage.map(a -> {
                Person follower = new Person();
                follower.setName(a.getName());
                Link url = new Link();
                url.setHref(uriComponentsBuilder.replacePath(String.format("/u/%s", a.getName())).toUriString());
                follower.setUrl(url);
                return follower;
            }).collect(Collectors.toList()));
            boolean hasNext = following.size() <= 20 * page;
            if (hasNext) {
                Link next = new Link();
                next.setHref(uriComponentsBuilder.queryParam("page", page + 1).toUriString());
                result.setNext(next);
            }
            return result;
        }
        throw new HttpNotFoundException();
    }
}