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package jdk.incubator.http;

import java.io.ByteArrayInputStream;

import java.net.ProtocolException;

import java.nio.ByteBuffer;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.stream.IntStream;

import sun.net.www.MessageHeader;

import org.testng.annotations.Test;

import org.testng.annotations.DataProvider;

import static java.lang.System.out;

import static java.lang.String.format;

import static java.nio.charset.StandardCharsets.US_ASCII;

import static java.util.stream.Collectors.toList;

import static org.testng.Assert.*;

// Mostly verifies the "new" Http1HeaderParser returns the same results as the

// tried and tested sun.net.www.MessageHeader.

public class Http1HeaderParserTest {

    @DataProvider(name = "responses")

    public Object[][] responses() {

        List<String> responses = new ArrayList<>();

        String[] basic =

            { "HTTP/1.1 200 OK\r\n\r\n",

              "HTTP/1.1 200 OK\r\n" +

              "Date: Mon, 15 Jan 2001 12:18:21 GMT\r\n" +

              "Server: Apache/1.3.14 (Unix)\r\n" +

              "Connection: close\r\n" +

              "Content-Type: text/html; charset=iso-8859-1\r\n" +

              "Content-Length: 10\r\n\r\n" +

              "123456789",

              "HTTP/1.1 200 OK\r\n" +

              "Content-Length: 9\r\n" +

              "Content-Type: text/html; charset=UTF-8\r\n\r\n" +

              "XXXXX",

              "HTTP/1.1 200 OK\r\n" +

              "Content-Length:   9\r\n" +

              "Content-Type:   text/html; charset=UTF-8\r\n\r\n" +   // more than one SP after ':'

              "XXXXX",

              "HTTP/1.1 200 OK\r\n" +

              "Content-Length:\t10\r\n" +

              "Content-Type:\ttext/html; charset=UTF-8\r\n\r\n" +   // HT separator

              "XXXXX",

              "HTTP/1.1 200 OK\r\n" +

              "Content-Length:\t\t10\r\n" +

              "Content-Type:\t\ttext/html; charset=UTF-8\r\n\r\n" +   // more than one HT after ':'

              "XXXXX",

              "HTTP/1.1 407 Proxy Authorization Required\r\n" +

              "Proxy-Authenticate: Basic realm=\"a fake realm\"\r\n\r\n",

              "HTTP/1.1 401 Unauthorized\r\n" +

              "WWW-Authenticate: Digest realm=\"wally land\" domain=/ " +

              "nonce=\"2B7F3A2B\" qop=\"auth\"\r\n\r\n",

              "HTTP/1.1 200 OK\r\n" +

              "X-Foo:\r\n\r\n",      // no value

              "HTTP/1.1 200 OK\r\n" +

              "X-Foo:\r\n\r\n" +     // no value, with response body

              "Some Response Body",

              "HTTP/1.1 200 OK\r\n" +

              "X-Foo:\r\n" +    // no value, followed by another header

              "Content-Length: 10\r\n\r\n" +

              "Some Response Body",

              "HTTP/1.1 200 OK\r\n" +

              "X-Foo:\r\n" +    // no value, followed by another header, with response body

              "Content-Length: 10\r\n\r\n",

              "HTTP/1.1 200 OK\r\n" +

              "X-Foo: chegar\r\n" +

              "X-Foo: dfuchs\r\n" +  // same header appears multiple times

              "Content-Length: 0\r\n" +

              "X-Foo: michaelm\r\n" +

              "X-Foo: prappo\r\n\r\n",

              "HTTP/1.1 200 OK\r\n" +

              "X-Foo:\r\n" +    // no value, same header appears multiple times

              "X-Foo: dfuchs\r\n" +

              "Content-Length: 0\r\n" +

              "X-Foo: michaelm\r\n" +

              "X-Foo: prappo\r\n\r\n",

            };

        Arrays.stream(basic).forEach(responses::add);

        String[] foldingTemplate =

           {  "HTTP/1.1 200 OK\r\n" +

              "Content-Length: 9\r\n" +

              "Content-Type: text/html;$NEWLINE" +  // folding field-value with '\n'|'\r'

              " charset=UTF-8\r\n" +                // one preceding SP

              "Connection: close\r\n\r\n" +

              "XXYYZZAABBCCDDEE",

              "HTTP/1.1 200 OK\r\n" +

              "Content-Length: 19\r\n" +

              "Content-Type: text/html;$NEWLINE" +  // folding field-value with '\n'|'\r

              "   charset=UTF-8\r\n" +              // more than one preceding SP

              "Connection: keep-alive\r\n\r\n" +

              "XXYYZZAABBCCDDEEFFGG",

              "HTTP/1.1 200 OK\r\n" +

              "Content-Length: 999\r\n" +

              "Content-Type: text/html;$NEWLINE" +  // folding field-value with '\n'|'\r

              "\tcharset=UTF-8\r\n" +               // one preceding HT

              "Connection: close\r\n\r\n" +

              "XXYYZZAABBCCDDEE",

              "HTTP/1.1 200 OK\r\n" +

              "Content-Length: 54\r\n" +

              "Content-Type: text/html;$NEWLINE" +  // folding field-value with '\n'|'\r

              "\t\t\tcharset=UTF-8\r\n" +           // more than one preceding HT

              "Connection: keep-alive\r\n\r\n" +

              "XXYYZZAABBCCDDEEFFGG",

              "HTTP/1.1 200 OK\r\n" +

              "Content-Length: -1\r\n" +

              "Content-Type: text/html;$NEWLINE" +  // folding field-value with '\n'|'\r

              "\t \t \tcharset=UTF-8\r\n" +         // mix of preceding HT and SP

              "Connection: keep-alive\r\n\r\n" +

              "XXYYZZAABBCCDDEEFFGGHH",

              "HTTP/1.1 200 OK\r\n" +

              "Content-Length: 65\r\n" +

              "Content-Type: text/html;$NEWLINE" +  // folding field-value with '\n'|'\r

              " \t \t charset=UTF-8\r\n" +          // mix of preceding SP and HT

              "Connection: keep-alive\r\n\r\n" +

              "XXYYZZAABBCCDDEEFFGGHHII",

           };

        for (String newLineChar : new String[] { "\n", "\r" }) {

            for (String template : foldingTemplate)

                responses.add(template.replace("$NEWLINE", newLineChar));

        }

        String[] bad = // much of this is to retain parity with legacy MessageHeaders

           { "HTTP/1.1 200 OK\r\n" +

             "Connection:\r\n\r\n",   // empty value, no body

             "HTTP/1.1 200 OK\r\n" +

             "Connection:\r\n\r\n" +  // empty value, with body

             "XXXXX",

             "HTTP/1.1 200 OK\r\n" +

             ": no header\r\n\r\n",  // no/empty header-name, no body, no following header

             "HTTP/1.1 200 OK\r\n" +

             ": no; header\r\n" +  // no/empty header-name, no body, following header

             "Content-Length: 65\r\n\r\n",

             "HTTP/1.1 200 OK\r\n" +

             ": no header\r\n" +  // no/empty header-name

             "Content-Length: 65\r\n\r\n" +

             "XXXXX",

             "HTTP/1.1 200 OK\r\n" +

             ": no header\r\n\r\n" +  // no/empty header-name, followed by header

             "XXXXX",

             "HTTP/1.1 200 OK\r\n" +

             "Conte\r" +

             " nt-Length: 9\r\n" +    // fold/bad header name ???

             "Content-Type: text/html; charset=UTF-8\r\n\r\n" +

             "XXXXX",

             "HTTP/1.1 200 OK\r\n" +

             "Conte\r" +

             "nt-Length: 9\r\n" +    // fold/bad header name ??? without preceding space

             "Content-Type: text/html; charset=UTF-8\r\n\r\n" +

             "XXXXXYYZZ",

             "HTTP/1.0 404 Not Found\r\n" +

             "header-without-colon\r\n\r\n",

             "HTTP/1.0 404 Not Found\r\n" +

             "header-without-colon\r\n\r\n" +

             "SOMEBODY",

           };

        Arrays.stream(bad).forEach(responses::add);

        return responses.stream().map(p -> new Object[] { p }).toArray(Object[][]::new);

    }

    @Test(dataProvider = "responses")

    public void verifyHeaders(String respString) throws Exception {

        byte[] bytes = respString.getBytes(US_ASCII);

        ByteArrayInputStream bais = new ByteArrayInputStream(bytes);

        MessageHeader m = new MessageHeader(bais);

        Map<String,List<String>> messageHeaderMap = m.getHeaders();

        int available = bais.available();

        Http1HeaderParser decoder = new Http1HeaderParser();

        ByteBuffer b = ByteBuffer.wrap(bytes);

        decoder.parse(b);

        Map<String,List<String>> decoderMap1 = decoder.headers().map();

        assertEquals(available, b.remaining(),

                     "stream available not equal to remaining");

        // assert status-line

        String statusLine1 = messageHeaderMap.get(null).get(0);

        String statusLine2 = decoder.statusLine();

        if (statusLine1.startsWith("HTTP")) {// skip the case where MH's messes up the status-line

            assertEquals(statusLine1, statusLine2, "Status-line not equal");

        } else {

            assertTrue(statusLine2.startsWith("HTTP/1."), "Status-line not HTTP/1.");

        }

        // remove the null'th entry with is the status-line

        Map<String,List<String>> map = new HashMap<>();

        for (Map.Entry<String,List<String>> e : messageHeaderMap.entrySet()) {

            if (e.getKey() != null) {

                map.put(e.getKey(), e.getValue());

            }

        }

        messageHeaderMap = map;

        assertHeadersEqual(messageHeaderMap, decoderMap1,

                          "messageHeaderMap not equal to decoderMap1");

        // byte at a time

        decoder = new Http1HeaderParser();

        List<ByteBuffer> buffers = IntStream.range(0, bytes.length)

                .mapToObj(i -> ByteBuffer.wrap(bytes, i, 1))

                .collect(toList());

        while (decoder.parse(buffers.remove(0)) != true);

        Map<String,List<String>> decoderMap2 = decoder.headers().map();

        assertEquals(available, buffers.size(),

                     "stream available not equals to remaining buffers");

        assertEquals(decoderMap1, decoderMap2, "decoder maps not equal");

    }

    @DataProvider(name = "errors")

    public Object[][] errors() {

        List<String> responses = new ArrayList<>();

        // These responses are parsed, somewhat, by MessageHeaders but give

        // nonsensible results. They, correctly, fail with the Http1HeaderParser.

        String[] bad =

           {// "HTTP/1.1 402 Payment Required\r\n" +

            // "Content-Length: 65\r\n\r",   // missing trailing LF   //TODO: incomplete

             "HTTP/1.1 402 Payment Required\r\n" +

             "Content-Length: 65\r\n\rT\r\n\r\nGGGGGG",

             "HTTP/1.1 200OK\r\n\rT",

             "HTTP/1.1 200OK\rT",

           };

        Arrays.stream(bad).forEach(responses::add);

        return responses.stream().map(p -> new Object[] { p }).toArray(Object[][]::new);

    }

    @Test(dataProvider = "errors", expectedExceptions = ProtocolException.class)

    public void errors(String respString) throws ProtocolException {

        byte[] bytes = respString.getBytes(US_ASCII);

        Http1HeaderParser decoder = new Http1HeaderParser();

        ByteBuffer b = ByteBuffer.wrap(bytes);

        decoder.parse(b);

    }

    void assertHeadersEqual(Map<String,List<String>> expected,

                            Map<String,List<String>> actual,

                            String msg) {

        if (expected.equals(actual))

            return;

        assertEquals(expected.size(), actual.size(),

                     format("%s. Expected size %d, actual size %s. expected= %s, actual=%s.",

                            msg, expected.size(), actual.size(), expected, actual));

        for (Map.Entry<String,List<String>> e : expected.entrySet()) {

            String key = e.getKey();

            List<String> values = e.getValue();

            boolean found = false;

            for (Map.Entry<String,List<String>> other: actual.entrySet()) {

                if (key.equalsIgnoreCase(other.getKey())) {

                    found = true;

                    List<String> otherValues = other.getValue();

                    assertEquals(values.size(), otherValues.size(),

                                 format("%s. Expected list size %d, actual size %s",

                                        msg, values.size(), otherValues.size()));

                    if (!values.containsAll(otherValues) && otherValues.containsAll(values))

                        assertTrue(false, format("Lists are unequal [%s] [%s]", values, otherValues));

                    break;

                }

            }

            assertTrue(found, format("header name, %s, not found in %s", key, actual));

        }

    }

    // ---

    /* Main entry point for standalone testing of the main functional test. */

    public static void main(String... args) throws Exception  {

        Http1HeaderParserTest test = new Http1HeaderParserTest();

        int count = 0;

        for (Object[] objs : test.responses()) {

            out.println("Testing " + count++ + ", " + objs[0]);

            test.verifyHeaders((String) objs[0]);

        }

        for (Object[] objs : test.errors()) {

            out.println("Testing " + count++ + ", " + objs[0]);

            try {

                test.errors((String) objs[0]);

                throw new RuntimeException("Expected ProtocolException for " + objs[0]);

            } catch (ProtocolException expected) { /* Ok */ }

        }

    }

}