/*
 * Copyright (C) 2008-2023, Juick
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.juick.service;

import com.fasterxml.jackson.databind.ObjectMapper;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Component;
import org.springframework.web.util.UriComponentsBuilder;

import jakarta.inject.Inject;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.StreamSupport;

@Component
public class PatreonService {

    private static final Logger logger = LoggerFactory.getLogger("Patreon");

    @Inject
    private UserService userService;
    @Inject
    private OkHttpClient httpClient;
    @Inject
    private ObjectMapper jsonMapper;
    @Value("${patreon_creator_access_token:secret}")
    private String creatorAccessToken;

    public List<String> fetchCampaigns() {
        var resourceUri = UriComponentsBuilder.fromPath("/api/oauth2/v2/campaigns")
                .host("www.patreon.com")
                .scheme("https").build().toUriString();
        var request = new Request.Builder()
                .url(resourceUri)
                .addHeader(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE)
                .addHeader(HttpHeaders.AUTHORIZATION, "Bearer " + creatorAccessToken)
                .build();
        try {
            try (var response = httpClient.newCall(request).execute()) {
                if (response.isSuccessful() && response.body() != null) {
                    var body = jsonMapper.readTree(response.body().string());
                    var data = body.get("data");
                    return StreamSupport.stream(data.spliterator(), false)
                            .map(campaign -> campaign.get("id").textValue())
                            .toList();
                }
            }
        } catch (IOException e) {
            return List.of();
        }
        return List.of();
    }
    public List<String> fetchPledges(String campaignId) {
        var resourceUri = UriComponentsBuilder.fromPath(String.format("/api/oauth2/api/campaigns/%s/pledges?include=patron.null", campaignId))
                .host("www.patreon.com")
                .scheme("https").build().toUriString();
        var request = new Request.Builder()
                .url(resourceUri)
                .addHeader(HttpHeaders.ACCEPT, MediaType.APPLICATION_JSON_VALUE)
                .addHeader(HttpHeaders.AUTHORIZATION, "Bearer " + creatorAccessToken)
                .build();
        try {
            try (var response = httpClient.newCall(request).execute()) {
                if (response.isSuccessful() && response.body() != null) {
                    var body = jsonMapper.readTree(response.body().string());
                    var data = body.get("included");
                    return StreamSupport.stream(data.spliterator(), false)
                            .map(campaign -> campaign.get("attributes").get("email").textValue())
                            .toList();
                }
            }
        } catch (IOException e) {
            return List.of();
        }
        return List.of();
    }

    public void updateStatus(List<String> updatedEmails) {
        var campainsResponse = fetchCampaigns();
        List<String> activeEmails = new ArrayList<>();
        campainsResponse.forEach(campaign -> {
            var pledgesResponse = fetchPledges(campaign);
            pledgesResponse.forEach(pledge -> {
                logger.debug("Pledge email: {}", pledge);
                activeEmails.add(pledge);
            });
        });
        activeEmails.forEach(email -> {
            var user = userService.getUserByEmail(email);
            if (!user.isAnonymous()) {
                userService.setPremium(user.getUid(), true);
            }
        });
        updatedEmails.stream().filter(email -> !activeEmails.contains(email))
                .forEach(deleted -> {
                    var user = userService.getUserByEmail(deleted);
                    if (!user.isAnonymous() && user.isPremium()) {
                        logger.debug("User is not a patron anymore: {}", deleted);
                        userService.setPremium(user.getUid(), false);
                    }
                });
    }
}