/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * 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 com.android.email;

import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.test.ProviderTestCase2;
import android.test.suitebuilder.annotation.Suppress;

import com.android.email.provider.EmailProvider;
import com.android.email.provider.ProviderTestUtils;
import com.android.emailcommon.internet.MimeHeader;
import com.android.emailcommon.internet.MimeUtility;
import com.android.emailcommon.mail.Address;
import com.android.emailcommon.mail.BodyPart;
import com.android.emailcommon.mail.Flag;
import com.android.emailcommon.mail.Message;
import com.android.emailcommon.mail.Message.RecipientType;
import com.android.emailcommon.mail.MessageTestUtils;
import com.android.emailcommon.mail.MessageTestUtils.MessageBuilder;
import com.android.emailcommon.mail.MessageTestUtils.MultipartBuilder;
import com.android.emailcommon.mail.MessagingException;
import com.android.emailcommon.mail.Part;
import com.android.emailcommon.provider.EmailContent;
import com.android.emailcommon.provider.EmailContent.Attachment;

import java.io.IOException;
import java.util.ArrayList;

/**
 * Tests of the Legacy Conversions code (used by MessagingController).
 *
 * NOTE:  It would probably make sense to rewrite this using a MockProvider, instead of the
 * ProviderTestCase (which is a real provider running on a temp database).  This would be more of
 * a true "unit test".
 *
 * You can run this entire test case with:
 *   runtest -c com.android.email.LegacyConversionsTests email
 */
@Suppress
public class LegacyConversionsTests extends ProviderTestCase2<EmailProvider> {

    Context mProviderContext;
    Context mContext;

    public LegacyConversionsTests() {
        super(EmailProvider.class, EmailContent.AUTHORITY);
    }

    @Override
    public void setUp() throws Exception {
        super.setUp();
        mProviderContext = getMockContext();
        mContext = getContext();
    }

    /**
     * TODO: basic Legacy -> Provider Message conversions
     * TODO: basic Legacy -> Provider Body conversions
     * TODO: rainy day tests of all kinds
     */

    /**
     * Sunny day test of adding attachments from an IMAP/POP message.
     */
    public void brokentestAddAttachments() throws MessagingException, IOException {
        // Prepare a local message to add the attachments to
        final long accountId = 1;
        final long mailboxId = 1;

        // test 1: legacy message using content-type:name style for name
        final EmailContent.Message localMessage = ProviderTestUtils.setupMessage(
                "local-message", accountId, mailboxId, false, true, mProviderContext);
        final Message legacyMessage = prepareLegacyMessageWithAttachments(2, false);
        convertAndCheckcheckAddedAttachments(localMessage, legacyMessage);

        // test 2: legacy message using content-disposition:filename style for name
        final EmailContent.Message localMessage2 = ProviderTestUtils.setupMessage(
                "local-message", accountId, mailboxId, false, true, mProviderContext);
        final Message legacyMessage2 = prepareLegacyMessageWithAttachments(2, true);
        convertAndCheckcheckAddedAttachments(localMessage2, legacyMessage2);
    }

    /**
     * Helper for testAddAttachments
     */
    private void convertAndCheckcheckAddedAttachments(final EmailContent.Message localMessage,
            final Message legacyMessage) throws MessagingException, IOException {
        // Now, convert from legacy to provider and see what happens
        ArrayList<Part> viewables = new ArrayList<Part>();
        ArrayList<Part> attachments = new ArrayList<Part>();
        MimeUtility.collectParts(legacyMessage, viewables, attachments);
        LegacyConversions.updateAttachments(mProviderContext, localMessage, attachments);

        // Read back all attachments for message and check field values
        Uri uri = ContentUris.withAppendedId(Attachment.MESSAGE_ID_URI, localMessage.mId);
        Cursor c = mProviderContext.getContentResolver().query(uri, Attachment.CONTENT_PROJECTION,
                null, null, null);
        try {
            assertEquals(2, c.getCount());
            while (c.moveToNext()) {
                Attachment attachment =
                        Attachment.getContent(mProviderContext, c, Attachment.class);
                if ("100".equals(attachment.mLocation)) {
                    checkAttachment("attachment1Part", attachments.get(0), attachment,
                            localMessage.mAccountKey);
                } else if ("101".equals(attachment.mLocation)) {
                    checkAttachment("attachment2Part", attachments.get(1), attachment,
                            localMessage.mAccountKey);
                } else {
                    fail("Unexpected attachment with location " + attachment.mLocation);
                }
            }
        } finally {
            c.close();
        }
    }

    /**
     * Test that only "attachment" or "inline" attachments are captured and added.
     * @throws MessagingException
     * @throws IOException
     */
    public void brokentestAttachmentDispositions() throws MessagingException, IOException {
        // Prepare a local message to add the attachments to
        final long accountId = 1;
        final long mailboxId = 1;

        // Prepare the three attachments we want to test
        BodyPart[] sourceAttachments = new BodyPart[3];
        BodyPart attachmentPart;

        // 1. Standard attachment
        attachmentPart = MessageTestUtils.bodyPart("image/jpg", null);
        attachmentPart.setHeader(MimeHeader.HEADER_CONTENT_TYPE, "image/jpg");
        attachmentPart.setHeader(MimeHeader.HEADER_CONTENT_TRANSFER_ENCODING, "base64");
        attachmentPart.setHeader(MimeHeader.HEADER_CONTENT_DISPOSITION,
                "attachment;\n filename=\"file-1\";\n size=100");
        attachmentPart.setHeader(MimeHeader.HEADER_ANDROID_ATTACHMENT_STORE_DATA, "100");
        sourceAttachments[0] = attachmentPart;

        // 2. Inline attachment
        attachmentPart = MessageTestUtils.bodyPart("image/gif", null);
        attachmentPart.setHeader(MimeHeader.HEADER_CONTENT_TYPE, "image/gif");
        attachmentPart.setHeader(MimeHeader.HEADER_CONTENT_TRANSFER_ENCODING, "base64");
        attachmentPart.setHeader(MimeHeader.HEADER_CONTENT_DISPOSITION,
                "inline;\n filename=\"file-2\";\n size=200");
        attachmentPart.setHeader(MimeHeader.HEADER_ANDROID_ATTACHMENT_STORE_DATA, "101");
        sourceAttachments[1] = attachmentPart;

        // 3. Neither (use VCALENDAR)
        attachmentPart = MessageTestUtils.bodyPart("text/calendar", null);
        attachmentPart.setHeader(MimeHeader.HEADER_CONTENT_TYPE,
                "text/calendar; charset=UTF-8; method=REQUEST");
        attachmentPart.setHeader(MimeHeader.HEADER_CONTENT_TRANSFER_ENCODING, "7bit");
        attachmentPart.setHeader(MimeHeader.HEADER_ANDROID_ATTACHMENT_STORE_DATA, "102");
        sourceAttachments[2] = attachmentPart;

        // Prepare local message (destination) and legacy message w/attachments (source)
        final EmailContent.Message localMessage = ProviderTestUtils.setupMessage(
                "local-message", accountId, mailboxId, false, true, mProviderContext);
        final Message legacyMessage = prepareLegacyMessageWithAttachments(sourceAttachments);
        convertAndCheckcheckAddedAttachments(localMessage, legacyMessage);

        // Run the conversion and check for the converted attachments - this test asserts
        // that there are two attachments numbered 100 & 101 (so will fail if it finds 102)
        convertAndCheckcheckAddedAttachments(localMessage, legacyMessage);
    }

    /**
     * Test that attachments aren't re-added in the DB.  This supports the "partial download"
     * nature of POP messages.
     */
    public void brokentestAddDuplicateAttachments() throws MessagingException, IOException {
        // Prepare a local message to add the attachments to
        final long accountId = 1;
        final long mailboxId = 1;
        final EmailContent.Message localMessage = ProviderTestUtils.setupMessage(
                "local-message", accountId, mailboxId, false, true, mProviderContext);

        // Prepare a legacy message with attachments
        Message legacyMessage = prepareLegacyMessageWithAttachments(2, false);

        // Now, convert from legacy to provider and see what happens
        ArrayList<Part> viewables = new ArrayList<Part>();
        ArrayList<Part> attachments = new ArrayList<Part>();
        MimeUtility.collectParts(legacyMessage, viewables, attachments);
        LegacyConversions.updateAttachments(mProviderContext, localMessage, attachments);

        // Confirm two attachment objects created
        Uri uri = ContentUris.withAppendedId(Attachment.MESSAGE_ID_URI, localMessage.mId);
        assertEquals(2, EmailContent.count(mProviderContext, uri, null, null));

        // Now add the attachments again and confirm there are still only two
        LegacyConversions.updateAttachments(mProviderContext, localMessage, attachments);
        assertEquals(2, EmailContent.count(mProviderContext, uri, null, null));

        // Now add a 3rd & 4th attachment and make sure the total is 4, not 2 or 6
        legacyMessage = prepareLegacyMessageWithAttachments(4, false);
        viewables = new ArrayList<Part>();
        attachments = new ArrayList<Part>();
        MimeUtility.collectParts(legacyMessage, viewables, attachments);
        LegacyConversions.updateAttachments(mProviderContext, localMessage, attachments);
        assertEquals(4, EmailContent.count(mProviderContext, uri, null, null));
    }

    /**
     * Prepare a legacy message with 1+ attachments
     * @param numAttachments how many attachments to add
     * @param filenameInDisposition False: attachment names are sent as content-type:name.  True:
     *          attachment names are sent as content-disposition:filename.
     */
    private Message prepareLegacyMessageWithAttachments(int numAttachments,
            boolean filenameInDisposition) throws MessagingException {
        BodyPart[] attachmentParts = new BodyPart[numAttachments];
        for (int i = 0; i < numAttachments; ++i) {
            // construct parameter parts for content-type:name or content-disposition:filename.
            String name = "";
            String filename = "";
            String quotedName = "\"test-attachment-" + i + "\"";
            if (filenameInDisposition) {
                filename = ";\n filename=" + quotedName;
            } else {
                name = ";\n name=" + quotedName;
            }

            // generate an attachment that came from a server
            BodyPart attachmentPart = MessageTestUtils.bodyPart("image/jpg", null);

            // name=attachmentN size=N00 location=10N
            attachmentPart.setHeader(MimeHeader.HEADER_CONTENT_TYPE, "image/jpg" + name);
            attachmentPart.setHeader(MimeHeader.HEADER_CONTENT_TRANSFER_ENCODING, "base64");
            attachmentPart.setHeader(MimeHeader.HEADER_CONTENT_DISPOSITION,
                    "attachment" + filename +  ";\n size=" + (i+1) + "00");
            attachmentPart.setHeader(MimeHeader.HEADER_ANDROID_ATTACHMENT_STORE_DATA, "10" + i);

            attachmentParts[i] = attachmentPart;
        }

        return prepareLegacyMessageWithAttachments(attachmentParts);
    }

    /**
     * Prepare a legacy message with 1+ attachments
     * @param attachments array containing one or more attachments
     */
    private Message prepareLegacyMessageWithAttachments(BodyPart[] attachments)
            throws MessagingException {
        // Build the multipart that holds the attachments
        MultipartBuilder mpBuilder = new MultipartBuilder("multipart/mixed");
        for (int i = 0; i < attachments.length; ++i) {
            mpBuilder.addBodyPart(attachments[i]);
        }

        // Now build a message with them
        final Message legacyMessage = new MessageBuilder()
            .setBody(new MultipartBuilder("multipart/mixed")
                     .addBodyPart(MessageTestUtils.bodyPart("text/html", null))
                     .addBodyPart(mpBuilder.buildBodyPart())
                     .build())
                .build();

        return legacyMessage;
    }

    /**
     * Compare attachment that was converted from Part (expected) to Provider Attachment (actual)
     *
     * TODO content URI should only be set if we also saved a file
     * TODO other data encodings
     */
    private void checkAttachment(String tag, Part expected, EmailContent.Attachment actual,
            long accountKey) throws MessagingException {
        String contentType = MimeUtility.unfoldAndDecode(expected.getContentType());
        String contentTypeName = MimeUtility.getHeaderParameter(contentType, "name");
        assertEquals(tag, expected.getMimeType(), actual.mMimeType);
        String disposition = expected.getDisposition();
        String sizeString = MimeUtility.getHeaderParameter(disposition, "size");
        String dispositionFilename = MimeUtility.getHeaderParameter(disposition, "filename");
        long expectedSize = (sizeString != null) ? Long.parseLong(sizeString) : 0;
        assertEquals(tag, expectedSize, actual.mSize);
        assertEquals(tag, expected.getContentId(), actual.mContentId);

        // filename is either content-type:name or content-disposition:filename
        String expectedName = (contentTypeName != null) ? contentTypeName : dispositionFilename;
        assertEquals(tag, expectedName, actual.mFileName);

        // content URI should be null
        assertNull(tag, actual.getContentUri());

        assertTrue(tag, 0 != actual.mMessageKey);

        // location is either both null or both matching
        String expectedPartId = null;
        String[] storeData = expected.getHeader(MimeHeader.HEADER_ANDROID_ATTACHMENT_STORE_DATA);
        if (storeData != null && storeData.length > 0) {
            expectedPartId = storeData[0];
        }
        assertEquals(tag, expectedPartId, actual.mLocation);
        assertEquals(tag, "B", actual.mEncoding);
        assertEquals(tag, accountKey, actual.mAccountKey);
    }

    /**
     * TODO: Sunny day test of adding attachments from a POP message.
     */

    /**
     * Sunny day tests of converting an original message to a legacy message
     */
    public void brokentestMakeLegacyMessage() throws MessagingException {
        // Set up and store a message in the provider
        long account1Id = 1;
        long mailbox1Id = 1;

        // Test message 1: No body
        EmailContent.Message localMessage1 = ProviderTestUtils.setupMessage("make-legacy",
                account1Id, mailbox1Id, false, true, mProviderContext);
        Message getMessage1 = LegacyConversions.makeMessage(mProviderContext, localMessage1);
        checkLegacyMessage("no body", localMessage1, getMessage1);

        // Test message 2: Simple body
        EmailContent.Message localMessage2 = ProviderTestUtils.setupMessage("make-legacy",
                account1Id, mailbox1Id, true, false, mProviderContext);
        localMessage2.mFlags &= ~EmailContent.Message.FLAG_TYPE_MASK;
        localMessage2.save(mProviderContext);
        Message getMessage2 = LegacyConversions.makeMessage(mProviderContext, localMessage2);
        checkLegacyMessage("simple body", localMessage2, getMessage2);

        // Test message 3: Body + replied-to text
        EmailContent.Message localMessage3 = ProviderTestUtils.setupMessage("make-legacy",
                account1Id, mailbox1Id, true, false, mProviderContext);
        localMessage3.mFlags &= ~EmailContent.Message.FLAG_TYPE_MASK;
        localMessage3.mFlags |= EmailContent.Message.FLAG_TYPE_REPLY;
        localMessage3.save(mProviderContext);
        Message getMessage3 = LegacyConversions.makeMessage(mProviderContext, localMessage3);
        checkLegacyMessage("reply-to", localMessage3, getMessage3);

        // Test message 4: Body + forwarded text
        EmailContent.Message localMessage4 = ProviderTestUtils.setupMessage("make-legacy",
                account1Id, mailbox1Id, true, false, mProviderContext);
        localMessage4.mFlags &= ~EmailContent.Message.FLAG_TYPE_MASK;
        localMessage4.mFlags |= EmailContent.Message.FLAG_TYPE_FORWARD;
        localMessage4.save(mProviderContext);
        Message getMessage4 = LegacyConversions.makeMessage(mProviderContext, localMessage4);
        checkLegacyMessage("forwarding", localMessage4, getMessage4);
    }

    /**
     * Check equality of a pair of converted messages
     */
    private void checkLegacyMessage(String tag, EmailContent.Message expect, Message actual)
            throws MessagingException {
        assertEquals(tag, expect.mServerId, actual.getUid());
        assertEquals(tag, expect.mServerTimeStamp, actual.getInternalDate().getTime());
        assertEquals(tag, expect.mSubject, actual.getSubject());
        assertEquals(tag, expect.mFrom, Address.toHeader(actual.getFrom()));
        assertEquals(tag, expect.mTimeStamp, actual.getSentDate().getTime());
        assertEquals(tag, expect.mTo, Address.toHeader(actual.getRecipients(RecipientType.TO)));
        assertEquals(tag, expect.mCc, Address.toHeader(actual.getRecipients(RecipientType.CC)));
        assertEquals(tag, expect.mBcc, Address.toHeader(actual.getRecipients(RecipientType.BCC)));
        assertEquals(tag, expect.mReplyTo, Address.toHeader(actual.getReplyTo()));
        assertEquals(tag, expect.mMessageId, actual.getMessageId());
        // check flags
        assertEquals(tag, expect.mFlagRead, actual.isSet(Flag.SEEN));
        assertEquals(tag, expect.mFlagFavorite, actual.isSet(Flag.FLAGGED));

        // Check the body of the message
        ArrayList<Part> viewables = new ArrayList<Part>();
        ArrayList<Part> attachments = new ArrayList<Part>();
        MimeUtility.collectParts(actual, viewables, attachments);
        String get1Text = null;
        String get1Html = null;
        for (Part viewable : viewables) {
            String text = MimeUtility.getTextFromPart(viewable);
            if (viewable.getMimeType().equalsIgnoreCase("text/html")) {
                get1Html = text;
            } else {
                get1Text = text;
            }
        }
        assertEquals(tag, expect.mText, get1Text);
        assertEquals(tag, expect.mHtml, get1Html);

        // TODO Check the attachments

//      cv.put("attachment_count", attachments.size());
    }
}