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package org.sdmlib.modelcouch;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Collection;
import java.util.LinkedList;

import org.sdmlib.modelcouch.connection.ContentType;
import org.sdmlib.modelcouch.connection.HTTPConnectionHandler;
import org.sdmlib.modelcouch.connection.RequestObject;
import org.sdmlib.modelcouch.connection.RequestType;
import org.sdmlib.modelcouch.connection.ReturnObject;
import org.sdmlib.modelcouch.connection.authentication.CookieAuthenticator;

import de.uniks.networkparser.json.JsonArray;
import de.uniks.networkparser.json.JsonObject;

public class CouchDBAdapter {
	private String userName = "";
	private String hostName = "localhost";
	private int port = 5984;
	HTTPConnectionHandler connectionHandler;

	public HTTPConnectionHandler getConnectionHandler() {
		if (connectionHandler == null) {
			connectionHandler = new HTTPConnectionHandler(getURL());
		}
		return connectionHandler;
	}

	private String getURL() {
		return "http://" + getHostName() + ":" + getPort() + "/";
	}

	public String getHostName() {
		return hostName;
	}

	public int getPort() {
		return port;
	}

	public String getUserName() {
		return userName;
	}

	public void setHostName(String hostName) {
		this.hostName = hostName;
	}

	public CouchDBAdapter withHostName(String hostName) {
		this.hostName = hostName;
		return this;
	}

	public void setPort(int port) {
		this.port = port;
	}

	public CouchDBAdapter withPort(int port) {
		this.port = port;
		return this;
	}

	public void setUserName(String username) {
		this.userName = username;
	}

	public CouchDBAdapter withUserName(String username) {
		this.userName = username;
		return this;
	}

	public ReturnObject replicate(ModelCouch modelCouch, String source, String target) {
		RequestObject request = createRequestObject();
		request.setPath("_replicate");
		request.setRequestType(RequestType.POST);

		/*
		 * {"source":"http://example.org/example-database","target":
		 * "http://admin:[email protected]:5984/example-database"}
		 */

		JsonObject replicateObject = new JsonObject();
		replicateObject.add("create_target", true);
		replicateObject.add("source", source);
		replicateObject.add("target", target);
		replicateObject.add("retries_per_request", 2);

		request.setOutput(replicateObject.toString().getBytes());

		return send(request);
	}

	private ReturnObject send(RequestObject request) {
		return request.send();
	}

	public ReturnObject setUserPrivileges(String database, Collection adminNames, Collection adminRoles,
			Collection memberNames, Collection memberRoles) {
		RequestObject request = createRequestObject();
		request.setPath(database + "/_security");
		request.setRequestType(RequestType.PUT);
		request.setShouldHandleInput(true);

		JsonObject json = new JsonObject();
		JsonObject admins = new JsonObject();
		JsonArray adminNamesJson = new JsonArray();
		adminNamesJson.addAll(adminNames);
		admins.add("names", adminNamesJson);
		JsonArray adminRolesJson = new JsonArray();
		adminRolesJson.addAll(adminRoles);
		admins.add("roles", adminRolesJson);
		json.put("admins", admins);
		JsonObject members = new JsonObject();
		JsonArray memberNamesJson = new JsonArray();
		memberNamesJson.addAll(memberNames);
		members.add("names", memberNamesJson);
		JsonArray memberRolesJson = new JsonArray();
		memberRolesJson.addAll(memberRoles);
		members.add("roles", memberRolesJson);
		json.put("members", members);

		request.setOutput(json.toString().getBytes(Charset.forName("UTF-8")));

		return send(request);
	}

	public RequestObject createRequestObject() {
		return getConnectionHandler().createRequestObject();
	}

	public ReturnObject createEmptyDocument(String path) {
		RequestObject newDoc = createRequestObject();
		newDoc.setPath(path);
		newDoc.setShouldHandleInput(true);
		newDoc.setRequestType(RequestType.POST);
		JsonObject jsonObject = new JsonObject();
		newDoc.setOutput(jsonObject.toString().getBytes());

		return send(newDoc);
	}

	public ReturnObject addAttachment(ReturnObject lastRes, Path path, ContentType contentType) {
		ReturnObject res = null;
		byte[] content = lastRes.getContentAsBytes();
		if (content != null && content.length > 0) {
			JsonObject jsonObject = new JsonObject();
			try {
				jsonObject.withValue(new String(content, "UTF-8"));
			} catch (UnsupportedEncodingException e1) {
				e1.printStackTrace();
			}
			// ...

			RequestObject attachRequest = createRequestObject();
			attachRequest.setShouldHandleInput(true);
			attachRequest.setContentType(contentType);
			attachRequest.setRequestType(RequestType.PUT);

			String id = (String) jsonObject.getValue("id");
			String rev = (String) jsonObject.getValue("rev");

			attachRequest.setServer(lastRes.getHeaderFields().get("Location").get(0));

			String filename = path.getFileName().toString();

			attachRequest.setPath("/" + filename + "?rev=" + rev);

			try {
				attachRequest.setOutput(Files.readAllBytes(path));
				res = send(attachRequest);
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		if (res == null)
			res = new ReturnObject();
		return res;
	}

	public byte[] getAttachment(String location) {
		byte[] res = null;

		RequestObject attachRequest = createRequestObject();
		attachRequest.setShouldHandleInput(true);
		attachRequest.setRequestType(RequestType.GET);

		attachRequest.setServer(location);
		attachRequest.setPath("");
		ReturnObject send = getConnectionHandler().send(attachRequest);

		// FIXME: We don't want Strings...
		res = send.getContentAsBytes();

		if (res == null)
			res = new byte[0];
		return res;
	}

	public byte[] getAttachment(ReturnObject lastRes) {
		byte[] res = null;
		LinkedList content = lastRes.getContentAsString();
		if (content != null && content.size() > 0) {
			JsonObject jsonObject = new JsonObject();
			jsonObject.withValue(content.toArray(new String[content.size()]));
			String rev = (String) jsonObject.getValue("rev");

			return getAttachment(lastRes.getHeaderFields().get("Location").get(0) + "?rev=" + rev);
		}
		return new byte[0];
	}

	// public ReturnObject send(RequestObject request) {
	// ReturnObject res = new ReturnObject();
	// try {
	// URL obj = new URL(request.getServer() + request.getPath());
	// HttpURLConnection con = (HttpURLConnection) obj.openConnection();
	// con.setRequestMethod(request.getRequestType().toString());
	// con.setDoInput(true);
	//
	// con.addRequestProperty("Content-Type",
	// request.getContentType().getValue());
	//
	// for (Entry entry :
	// request.getRequestProperties().entrySet()) {
	// con.addRequestProperty(entry.getKey(), entry.getValue());
	// }
	// authenticate(con);
	// // Write to DB
	// if ((request.getOutput() != null && request.getOutput().length > 0)) {
	// con.setDoOutput(true);
	// con.getOutputStream().write(request.getOutput());
	// }
	//
	// // Get the Results
	// res.setResponseCode(con.getResponseCode());
	// res.setResponseMessage(con.getResponseMessage());
	// res.setHeaderFields(con.getHeaderFields());
	//
	// if (res.getResponseCode() >= 400 && con.getErrorStream() != null) {
	// InputStream errorStream = (InputStream) con.getErrorStream();
	// BufferedReader reader = new BufferedReader(new
	// InputStreamReader(errorStream));
	// try {
	// LinkedList lines = new LinkedList<>();
	// String readLine = null;
	// do {
	// readLine = reader.readLine();
	// if (readLine == null) {
	// break;
	// }
	// lines.add(readLine);
	// // System.out.println(readLine);
	// } while (readLine != null);
	// res.setError(lines);
	// } catch (IOException e) {
	// // e.printStackTrace();
	// }
	// } else {
	// if (request.isShouldHandleInput()) {
	// InputStream content = (InputStream) con.getContent();
	// ByteArrayOutputStream buffer = new ByteArrayOutputStream();
	// int nRead;
	// byte[] data = new
	// byte[Integer.parseInt(res.getHeaderFields().get("Content-Length").get(0))];
	// while ((nRead = content.read(data, 0, data.length)) != -1) {
	// buffer.write(data, 0, nRead);
	// }
	// buffer.flush();
	// BufferedInputStream reader = new BufferedInputStream(content);
	// byte[] bytes = buffer.toByteArray();
	// res.setContent(bytes);
	// }
	// }
	// con.disconnect();
	// } catch (Exception e) {
	// res.setResponseCode(400);
	// e.printStackTrace();
	// }
	// return res;
	// }

	public boolean testConnection() {
		String urlString = "http://" + getHostName() + ":" + port;
		try {
			URL urlObj = new URL(urlString);
			URLConnection openConnection = urlObj.openConnection();
			openConnection.connect();
		} catch (IOException e) {
			return false;
		}
		return true;
	}

	public boolean testConnection(String databaseName) {
		return getConnectionHandler().testConnection(this.getHostName(), this.getPort(), databaseName);
	}

	public ReturnObject createDB(String dbName) {
		RequestObject create = createRequestObject();
		create.setRequestType(RequestType.PUT);
		create.setPath(dbName);
		return send(create);
	}

	public ReturnObject deleteDatabase(String databaseName) {
		RequestObject delete = createRequestObject();
		delete.setPath(databaseName);
		delete.setRequestType(RequestType.DELETE);
		return send(delete);
	}

	/**
	 * Must be called after setting credentials (and authenticator)
	 * 
	 * You can get the Return from the Server by asking the Authenticator for
	 * the loginRequest
	 * 
	 * @param password
	 *            The Password
	 * @return ThisComponent
	 * @throws Exception
	 *             any Errors for login
	 */
	public CouchDBAdapter login(String password) throws Exception {
		getConnectionHandler().login(getUserName(), password);
		return this;
	}

	public CouchDBAdapter withAuthenticator(CookieAuthenticator authenticator) {
		getConnectionHandler().setAuthenticator(authenticator);
		return this;
	}

}