/*
 * Copyright (c) 2019-2020. Developed by Hedgecode.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.hedgecode.chess.scanner.portal;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;

import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

import org.hedgecode.chess.scanner.ChessHogScannerConstants;
import org.hedgecode.chess.scanner.ChessHogScannerException;
import org.hedgecode.chess.scanner.Scanner;
import org.hedgecode.chess.scanner.regex.RegexMatcher;
import org.hedgecode.chess.scanner.regex.RegexMatcherResult;
import org.hedgecode.chess.scanner.regex.RegexResult;

/**
 * AbstractRequestScanner
 *
 * @author Dmitry Samoshin aka gotty
 */
public abstract class AbstractRequestScanner implements Scanner {

    protected String request(String url) throws ChessHogScannerException {
        HttpGet request = new HttpGet(url);
        CloseableHttpResponse response = null;
        StringBuilder sb = new StringBuilder();
        try {
            response = getClient().execute(request);
            try (BufferedReader br = new BufferedReader(
                    new InputStreamReader(
                            response.getEntity().getContent(),
                            ChessHogScannerConstants.CHARSET
                    )
            )) {
                String line;
                while ((line = br.readLine()) != null) {
                    sb.append(
                            line
                    ).append(
                            ChessHogScannerConstants.CRLF
                    );
                }
            }
        } catch (IOException cause) {
            throw new ChessHogScannerException(
                    String.format("Error occurred for requesting URL: %s", url), cause
            );
        } finally {
            if (response != null) {
                try {
                    response.close();
                } catch (IOException ignored) {}
            }
        }
        return sb.toString();
    }

    protected String matchRequest(String url, String match)
            throws ChessHogScannerException
    {
        List<String> result = matchRequest(url, match, true);
        return result.isEmpty() ? null : result.get(0);
    }

    protected List<String> matchRequest(String url, String match, boolean isFirst)
            throws ChessHogScannerException
    {
        RegexResult result = matchRequest(
                url,
                new RegexMatcherResult(
                        match,
                        isFirst,
                        false
                )
        );
        return result.resultList();
    }

    protected String matchRequest(String url, String startMatch, String endMatch)
            throws ChessHogScannerException
    {
        return matchRequest(url, startMatch, endMatch, true);
    }

    protected String matchRequest(String url, String startMatch, String endMatch, boolean isFirst)
            throws ChessHogScannerException
    {
        RegexResult result = matchRequest(
                url,
                new RegexMatcherResult(
                        startMatch,
                        endMatch,
                        isFirst,
                        false
                )
        );
        return result.isEmpty() ? null : result.resultList().get(0);
    }

/*
    protected String matchRequest(String url, String match)
            throws ChessHogScannerException
    {
        List<String> result = matchRequest(url, match, true);
        return result.isEmpty() ? null : result.get(0);
    }

    protected List<String> matchRequest(String url, String match, boolean isFirst)
            throws ChessHogScannerException
    {
        HttpGet request = new HttpGet(url);
        CloseableHttpResponse response = null;
        List<String> result = new ArrayList<>();
        try {
            response = getClient().execute(request);
            Pattern pattern = Pattern.compile(match);
            try (BufferedReader br = new BufferedReader(
                    new InputStreamReader(
                            response.getEntity().getContent(),
                            ChessHogScannerConstants.CHARSET
                    )
            )) {
                String line;
                while ((line = br.readLine()) != null) {
                    Matcher matcher = pattern.matcher(line);
                    if (matcher.find()) {
                        result.add(
                                matcher.group(1)
                        );
                        if (isFirst) {
                            break;
                        }
                    }
                }
            }
        } catch (IOException cause) {
            throw new ChessHogScannerException(
                    String.format("Error occurred for requesting URL: %s", url), cause
            );
        } finally {
            if (response != null) {
                try {
                    response.close();
                } catch (IOException ignored) {}
            }
        }
        return result;
    }

    protected String matchRequest(String url, String startMatch, String endMatch)
            throws ChessHogScannerException
    {
        return matchRequest(url, startMatch, endMatch, true);
    }

    protected String matchRequest(String url, String startMatch, String endMatch, boolean isFirst)
            throws ChessHogScannerException
    {
        HttpGet request = new HttpGet(url);
        CloseableHttpResponse response = null;
        StringBuilder sb = new StringBuilder();
        try {
            response = getClient().execute(request);
            Pattern startPattern = Pattern.compile(startMatch);
            Pattern endPattern = Pattern.compile(endMatch);
            try (BufferedReader br = new BufferedReader(
                    new InputStreamReader(
                            response.getEntity().getContent(),
                            ChessHogScannerConstants.CHARSET
                    )
            )) {
                String line;
                boolean isMatch = false;
                while ((line = br.readLine()) != null) {
                    Matcher matcher = isMatch
                            ? endPattern.matcher(line)
                            : startPattern.matcher(line);
                    if (matcher.find()) {
                        sb.append(line);
                        if (isMatch && isFirst) {
                            break;
                        }
                        isMatch = !isMatch;
                    } else {
                        if (isMatch) {
                            sb.append(line);
                        }
                    }
                }
            }
        } catch (IOException cause) {
            throw new ChessHogScannerException(
                    String.format("Error occurred for requesting URL: %s", url), cause
            );
        } finally {
            if (response != null) {
                try {
                    response.close();
                } catch (IOException ignored) {}
            }
        }
        return sb.length() > 0 ? sb.toString() : null;
    }
*/

    protected RegexResult matchRequest(String url, RegexMatcher matcher) throws ChessHogScannerException {
        HttpGet request = new HttpGet(url);
        CloseableHttpResponse response = null;
        try {
            response = getClient().execute(request);
            try (BufferedReader br = new BufferedReader(
                    new InputStreamReader(
                            response.getEntity().getContent(),
                            ChessHogScannerConstants.CHARSET
                    )
            )) {
                String line;
                while ((line = br.readLine()) != null) {
                    matcher.match(line);
                    if (matcher.isBreak()) {
                        break;
                    }
                }
            }
        } catch (IOException cause) {
            throw new ChessHogScannerException(
                    String.format("Error occurred for requesting URL: %s", url), cause
            );
        } finally {
            if (response != null) {
                try {
                    response.close();
                } catch (IOException ignored) {}
            }
        }
        return matcher.result();
    }

/*
    protected String urlEncode(String query) throws ChessHogScannerException {
        String encodeQuery;
        try {
            encodeQuery = URLEncoder.encode(
                    query, ChessHogScannerConstants.CHARSET.name()
            );
        } catch (UnsupportedEncodingException cause) {
            throw new ChessHogScannerException(
                    String.format("Unsupported encoding: %s", ChessHogScannerConstants.CHARSET.name()),
                    cause
            );
        }
        return encodeQuery;
    }
*/

    private CloseableHttpClient getClient() {
        return HttpClients.createMinimal();
    }

}