/*
 * mxisd - Matrix Identity Server Daemon
 * Copyright (C) 2017 Maxime Dor
 *
 * https://max.kamax.io/
 *
 * 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 io.kamax.mxisd.controller.v1;

import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import io.kamax.mxisd.auth.AuthManager;
import io.kamax.mxisd.auth.UserAuthResult;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

@RestController
@CrossOrigin
@RequestMapping(produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
public class AuthController {

    private Logger log = LoggerFactory.getLogger(AuthController.class);

    private Gson gson = new Gson();

    @Autowired
    private AuthManager mgr;

    @RequestMapping(value = "/_matrix-internal/identity/v1/check_credentials", method = RequestMethod.POST)
    public String checkCredentials(HttpServletRequest req) {
        try {
            JsonElement el = new JsonParser().parse(IOUtils.toString(req.getInputStream(), StandardCharsets.UTF_8));
            if (!el.isJsonObject() || !el.getAsJsonObject().has("user")) {
                throw new IllegalArgumentException("Missing user key");
            }

            JsonObject authData = el.getAsJsonObject().get("user").getAsJsonObject();
            if (!authData.has("id") || !authData.has("password")) {
                throw new IllegalArgumentException("Missing id or password keys");
            }

            String id = authData.get("id").getAsString();
            log.info("Requested to check credentials for {}", id);
            String password = authData.get("password").getAsString();

            UserAuthResult result = mgr.authenticate(id, password);

            JsonObject authObj = new JsonObject();
            authObj.addProperty("success", result.isSuccess());
            if (result.isSuccess()) {
                authObj.addProperty("mxid", result.getMxid());
                authObj.addProperty("display_name", result.getDisplayName());
            }
            JsonObject obj = new JsonObject();

            obj.add("authentication", authObj);
            return gson.toJson(obj);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

}