package eu.siacs.conversations.services;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.net.Uri;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;

import de.thedevstack.android.logcat.Logging;
import de.thedevstack.conversationsplus.ConversationsPlusApplication;
import de.thedevstack.conversationsplus.utils.AvatarUtil;
import de.thedevstack.conversationsplus.utils.ImageUtil;
import de.thedevstack.conversationsplus.utils.UiUpdateHelper;
import de.thedevstack.conversationsplus.utils.XmppSendUtil;
import de.thedevstack.conversationsplus.xmpp.avatar.AvatarPacketGenerator;
import de.thedevstack.conversationsplus.xmpp.avatar.AvatarPacketParser;
import eu.siacs.conversations.Config;
import eu.siacs.conversations.R;
import eu.siacs.conversations.entities.Account;
import eu.siacs.conversations.entities.Bookmark;
import eu.siacs.conversations.entities.Contact;
import eu.siacs.conversations.entities.Conversation;
import eu.siacs.conversations.entities.ListItem;
import eu.siacs.conversations.entities.Message;
import eu.siacs.conversations.entities.MucOptions;
import eu.siacs.conversations.generator.IqGenerator;
import eu.siacs.conversations.persistance.DatabaseBackend;
import eu.siacs.conversations.ui.UiCallback;
import eu.siacs.conversations.utils.UIHelper;
import eu.siacs.conversations.xml.Element;
import eu.siacs.conversations.xmpp.OnIqPacketReceived;
import eu.siacs.conversations.xmpp.pep.Avatar;
import eu.siacs.conversations.xmpp.stanzas.IqPacket;

public class AvatarService {

	private static final int FG_COLOR = 0xFFFAFAFA;
	private static final int TRANSPARENT = 0x00000000;
	private static final int PLACEHOLDER_COLOR = 0xFF202020;

	private static final String PREFIX_CONTACT = "contact";
	private static final String PREFIX_CONVERSATION = "conversation";
	private static final String PREFIX_ACCOUNT = "account";
	private static final String PREFIX_GENERIC = "generic";
    private static final AvatarService INSTANCE = new AvatarService();

    final private ArrayList<Integer> sizes = new ArrayList<>();
	private final List<String> mInProgressAvatarFetches = new ArrayList<>();
    
    public static AvatarService getInstance() {
        return INSTANCE;
    }

	private Bitmap get(final Contact contact, final int size, boolean cachedOnly) {
		final String KEY = key(contact, size);
		Bitmap avatar = ImageUtil.getBitmapFromCache(KEY);
		if (avatar != null || cachedOnly) {
			return avatar;
		}
		if (contact.getProfilePhoto() != null) {
			avatar = ImageUtil.cropCenterSquare(Uri.parse(contact.getProfilePhoto()), size);
		}
		if (avatar == null && contact.getAvatar() != null) {
			avatar = AvatarUtil.getAvatar(contact.getAvatar(), size);
		}
		if (avatar == null) {
            avatar = get(contact.getDisplayName(), size, cachedOnly);
		}
		ImageUtil.addBitmapToCache(KEY, avatar);
		return avatar;
	}

	public Bitmap get(final MucOptions.User user, final int size, boolean cachedOnly) {
		Contact c = user.getContact();
		if (c != null && (c.getProfilePhoto() != null || c.getAvatar() != null)) {
			return get(c, size, cachedOnly);
		} else {
			return getImpl(user, size, cachedOnly);
		}
	}

	private Bitmap getImpl(final MucOptions.User user, final int size, boolean cachedOnly) {
		final String KEY = key(user, size);
		Bitmap avatar = ImageUtil.getBitmapFromCache(KEY);
		if (avatar != null || cachedOnly) {
			return avatar;
		}
		if (user.getAvatar() != null) {
			avatar = AvatarUtil.getAvatar(user.getAvatar(), size);
		}
		if (avatar == null) {
			Contact contact = user.getContact();
			if (contact != null) {
				avatar = get(contact, size, cachedOnly);
			} else {
				avatar = get(user.getName(), size, cachedOnly);
			}
		}
		ImageUtil.addBitmapToCache(KEY, avatar);
		return avatar;
	}

	public void clear(Contact contact) {
		synchronized (this.sizes) {
			for (Integer size : sizes) {
				ImageUtil.removeBitmapFromCache(key(contact, size));
			}
		}
	}

	private String key(Contact contact, int size) {
		synchronized (this.sizes) {
			if (!this.sizes.contains(size)) {
				this.sizes.add(size);
			}
		}
		return PREFIX_CONTACT + "_" + contact.getAccount().getJid().toBareJid() + "_"
				+ contact.getJid() + "_" + String.valueOf(size);
	}

	private String key(MucOptions.User user, int size) {
		synchronized (this.sizes) {
			if (!this.sizes.contains(size)) {
				this.sizes.add(size);
			}
		}
		return PREFIX_CONTACT + "_" + user.getAccount().getJid().toBareJid() + "_"
				+ user.getFullJid() + "_" + String.valueOf(size);
	}

	public Bitmap get(ListItem item, int size) {
		return get(item,size,false);
	}

	public Bitmap get(ListItem item, int size, boolean cachedOnly) {
		if (item instanceof Contact) {
			return get((Contact) item, size,cachedOnly);
		} else if (item instanceof Bookmark) {
			Bookmark bookmark = (Bookmark) item;
			if (bookmark.getConversation() != null) {
				return get(bookmark.getConversation(), size, cachedOnly);
			} else {
				return get(bookmark.getDisplayName(), size, cachedOnly);
			}
		} else {
			return get(item.getDisplayName(), size, cachedOnly);
		}
	}

	public Bitmap get(Conversation conversation, int size) {
		return get(conversation,size,false);
	}

	public Bitmap get(Conversation conversation, int size, boolean cachedOnly) {
		if (conversation.getMode() == Conversation.MODE_SINGLE) {
			return get(conversation.getContact(), size, cachedOnly);
		} else {
			return get(conversation.getMucOptions(), size, cachedOnly);
		}
	}

	public void clear(Conversation conversation) {
		if (conversation.getMode() == Conversation.MODE_SINGLE) {
			clear(conversation.getContact());
		} else {
			clear(conversation.getMucOptions());
		}
	}

	private Bitmap get(MucOptions mucOptions, int size,  boolean cachedOnly) {
		final String KEY = key(mucOptions, size);
		Bitmap bitmap = ImageUtil.getBitmapFromCache(KEY);
		if (bitmap != null || cachedOnly) {
			return bitmap;
		}
		final List<MucOptions.User> users = mucOptions.getUsers();
		int count = users.size();
		bitmap = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
		Canvas canvas = new Canvas(bitmap);
		bitmap.eraseColor(TRANSPARENT);

		if (count == 0) {
			String name = mucOptions.getConversation().getName();
			drawTile(canvas, name, 0, 0, size, size);
		} else if (count == 1) {
			drawTile(canvas, users.get(0), 0, 0, size / 2 - 1, size);
			drawTile(canvas, mucOptions.getConversation().getAccount(), size / 2 + 1, 0, size, size);
		} else if (count == 2) {
			drawTile(canvas, users.get(0), 0, 0, size / 2 - 1, size);
			drawTile(canvas, users.get(1), size / 2 + 1, 0, size, size);
		} else if (count == 3) {
			drawTile(canvas, users.get(0), 0, 0, size / 2 - 1, size);
			drawTile(canvas, users.get(1), size / 2 + 1, 0, size, size / 2 - 1);
			drawTile(canvas, users.get(2), size / 2 + 1, size / 2 + 1, size,
					size);
		} else if (count == 4) {
			drawTile(canvas, users.get(0), 0, 0, size / 2 - 1, size / 2 - 1);
			drawTile(canvas, users.get(1), 0, size / 2 + 1, size / 2 - 1, size);
			drawTile(canvas, users.get(2), size / 2 + 1, 0, size, size / 2 - 1);
			drawTile(canvas, users.get(3), size / 2 + 1, size / 2 + 1, size,
					size);
		} else {
			drawTile(canvas, users.get(0), 0, 0, size / 2 - 1, size / 2 - 1);
			drawTile(canvas, users.get(1), 0, size / 2 + 1, size / 2 - 1, size);
			drawTile(canvas, users.get(2), size / 2 + 1, 0, size, size / 2 - 1);
			drawTile(canvas, "\u2026", PLACEHOLDER_COLOR, size / 2 + 1, size / 2 + 1,
					size, size);
		}
		ImageUtil.addBitmapToCache(KEY, bitmap);
		return bitmap;
	}

	public void clear(MucOptions options) {
		synchronized (this.sizes) {
			for (Integer size : sizes) {
				ImageUtil.removeBitmapFromCache(key(options, size));
			}
		}
	}

	private String key(MucOptions options, int size) {
		synchronized (this.sizes) {
			if (!this.sizes.contains(size)) {
				this.sizes.add(size);
			}
		}
		return PREFIX_CONVERSATION + "_" + options.getConversation().getUuid()
				+ "_" + String.valueOf(size);
	}

	public Bitmap get(Account account, int size) {
		return get(account, size, false);
	}

	public Bitmap get(Account account, int size, boolean cachedOnly) {
		final String KEY = key(account, size);
		Bitmap avatar = ImageUtil.getBitmapFromCache(KEY);
		if (avatar != null || cachedOnly) {
			return avatar;
		}
		avatar = AvatarUtil.getAvatar(account.getAvatar(), size);
		if (avatar == null) {
			avatar = get(account.getJid().toBareJid().toString(), size,false);
		}
		ImageUtil.addBitmapToCache(KEY, avatar);
		return avatar;
	}

	public Bitmap get(Message message, int size, boolean cachedOnly) {
		final Conversation conversation = message.getConversation();
		if (message.getStatus() == Message.STATUS_RECEIVED) {
			Contact c = message.getContact();
			if (c != null && (c.getProfilePhoto() != null || c.getAvatar() != null)) {
				return get(c, size, cachedOnly);
			} else if (message.getConversation().getMode() == Conversation.MODE_MULTI){
				MucOptions.User user = conversation.getMucOptions().findUser(message.getCounterpart().getResourcepart());
				if (user != null) {
					return getImpl(user,size,cachedOnly);
				}
			}
			return get(UIHelper.getMessageDisplayName(message), size, cachedOnly);
		} else  {
			return get(conversation.getAccount(), size, cachedOnly);
		}
	}

	public void clear(Account account) {
		synchronized (this.sizes) {
			for (Integer size : sizes) {
				ImageUtil.removeBitmapFromCache(key(account, size));
			}
		}
	}

	public void clear(MucOptions.User user) {
		synchronized (this.sizes) {
			for (Integer size : sizes) {
				ImageUtil.removeBitmapFromCache(key(user, size));
			}
		}
	}

	private String key(Account account, int size) {
		synchronized (this.sizes) {
			if (!this.sizes.contains(size)) {
				this.sizes.add(size);
			}
		}
		return PREFIX_ACCOUNT + "_" + account.getUuid() + "_"
				+ String.valueOf(size);
	}

	public Bitmap get(String name, int size) {
		return get(name,size,false);
	}

	public Bitmap get(final String name, final int size, boolean cachedOnly) {
		final String KEY = key(name, size);
		Bitmap bitmap = ImageUtil.getBitmapFromCache(KEY);
		if (bitmap != null || cachedOnly) {
			return bitmap;
		}
		bitmap = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
		Canvas canvas = new Canvas(bitmap);
		final String trimmedName = name.trim();
		drawTile(canvas, trimmedName, 0, 0, size, size);
		ImageUtil.addBitmapToCache(KEY, bitmap);
		return bitmap;
	}

	private String key(String name, int size) {
		synchronized (this.sizes) {
			if (!this.sizes.contains(size)) {
				this.sizes.add(size);
			}
		}
		return PREFIX_GENERIC + "_" + name + "_" + String.valueOf(size);
	}

	private boolean drawTile(Canvas canvas, String letter, int tileColor,
						  int left, int top, int right, int bottom) {
		letter = letter.toUpperCase(Locale.getDefault());
		Paint tilePaint = new Paint(), textPaint = new Paint();
		tilePaint.setColor(tileColor);
		textPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
		textPaint.setColor(FG_COLOR);
		textPaint.setTypeface(Typeface.create("sans-serif-light",
				Typeface.NORMAL));
		textPaint.setTextSize((float) ((right - left) * 0.8));
		Rect rect = new Rect();

		canvas.drawRect(new Rect(left, top, right, bottom), tilePaint);
		textPaint.getTextBounds(letter, 0, 1, rect);
		float width = textPaint.measureText(letter);
		canvas.drawText(letter, (right + left) / 2 - width / 2, (top + bottom)
				/ 2 + rect.height() / 2, textPaint);
		return true;
	}

	private boolean drawTile(Canvas canvas, MucOptions.User user, int left,
						  int top, int right, int bottom) {
		Contact contact = user.getContact();
		if (contact != null) {
			Uri uri = null;
			if (contact.getProfilePhoto() != null) {
				uri = Uri.parse(contact.getProfilePhoto());
			} else if (contact.getAvatar() != null) {
				uri = AvatarUtil.getAvatarUri(contact.getAvatar());
			}
			if (drawTile(canvas, uri, left, top, right, bottom)) {
				return true;
			}
		} else if (user.getAvatar() != null) {
			Uri uri = AvatarUtil.getAvatarUri(user.getAvatar());
			if (drawTile(canvas, uri, left, top, right, bottom)) {
				return true;
			}
		}
		String name = contact != null ? contact.getDisplayName() : user.getName();
		drawTile(canvas, name, left, top, right, bottom);
		return true;
	}

	private boolean drawTile(Canvas canvas, Account account, int left, int top, int right, int bottom) {
		String avatar = account.getAvatar();
		if (avatar != null) {
			Uri uri = AvatarUtil.getAvatarUri(avatar);
			if (uri != null) {
				if (drawTile(canvas, uri, left, top, right, bottom)) {
					return true;
				}
			}
		}
		return drawTile(canvas, account.getJid().toBareJid().toString(), left, top, right, bottom);
	}

	private boolean drawTile(Canvas canvas, String name, int left, int top, int right, int bottom) {
		if (name != null) {
			final String letter = name.isEmpty() ? "X" : name.substring(0, 1);
			final int color = UIHelper.getColorForName(name);
			drawTile(canvas, letter, color, left, top, right, bottom);
			return true;
		}
		return false;
	}

	private boolean drawTile(Canvas canvas, Uri uri, int left, int top, int right, int bottom) {
		if (uri != null) {
			Bitmap bitmap = ImageUtil.cropCenter(uri, bottom - top, right - left);
			if (bitmap != null) {
				drawTile(canvas, bitmap, left, top, right, bottom);
				return true;
			}
		}
		return false;
	}

	private boolean drawTile(Canvas canvas, Bitmap bm, int dstleft, int dsttop,
						  int dstright, int dstbottom) {
		Rect dst = new Rect(dstleft, dsttop, dstright, dstbottom);
		canvas.drawBitmap(bm, null, dst, null);
		return true;
	}

	public void publishAvatar(final Account account,
							  final Uri image,
							  final UiCallback<Avatar> callback) {
		final Bitmap.CompressFormat format = Config.AVATAR_FORMAT;
		final int size = Config.AVATAR_SIZE;
		final Avatar avatar = AvatarUtil.getPepAvatar(image, size, format);
		if (avatar != null) {
			avatar.height = size;
			avatar.width = size;
			if (format.equals(Bitmap.CompressFormat.WEBP)) {
				avatar.type = "image/webp";
			} else if (format.equals(Bitmap.CompressFormat.JPEG)) {
				avatar.type = "image/jpeg";
			} else if (format.equals(Bitmap.CompressFormat.PNG)) {
				avatar.type = "image/png";
			}
			if (!AvatarUtil.save(avatar)) {
				callback.error(R.string.error_saving_avatar, avatar);
				return;
			}
			final IqPacket packet = AvatarPacketGenerator.generatePublishAvatarPacket(avatar);
			XmppSendUtil.sendIqPacket(account, packet, new OnIqPacketReceived() {

				@Override
				public void onIqPacketReceived(Account account, IqPacket result) {
					if (result.getType() == IqPacket.TYPE.RESULT) {
						final IqPacket packet = AvatarPacketGenerator.generatePublishAvatarMetadataPacket(avatar);
						XmppSendUtil.sendIqPacket(account, packet, new OnIqPacketReceived() {

							@Override
							public void onIqPacketReceived(Account account,
														   IqPacket result) {
								if (result.getType() == IqPacket.TYPE.RESULT) {
									if (account.setAvatar(avatar.getFilename())) {
										AvatarService.getInstance().clear(account);
										DatabaseBackend.getInstance(ConversationsPlusApplication.getAppContext()).updateAccount(account);
									}
									callback.success(avatar);
								} else {
									callback.error(
											R.string.error_publish_avatar_server_reject,
											avatar);
								}
							}
						});
					} else {
						callback.error(
								R.string.error_publish_avatar_server_reject,
								avatar);
					}
				}
			});
		} else {
			callback.error(R.string.error_publish_avatar_converting, null);
		}
	}

    private static String generateFetchKey(Account account, final Avatar avatar) {
        return account.getJid().toBareJid()+"_"+avatar.owner+"_"+avatar.sha1sum;
    }

	public void fetchAvatar(Account account, final Avatar avatar, final UiCallback<Avatar> callback) {
		final String KEY = generateFetchKey(account, avatar);
		synchronized(this.mInProgressAvatarFetches) {
			if (this.mInProgressAvatarFetches.contains(KEY)) {
				return;
			} else {
				switch (avatar.origin) {
					case PEP:
						this.mInProgressAvatarFetches.add(KEY);
						fetchAvatarPep(account, avatar, callback);
						break;
					case VCARD:
						this.mInProgressAvatarFetches.add(KEY);
						fetchAvatarVcard(account, avatar, callback);
						break;
				}
			}
		}
	}

	private void fetchAvatarPep(final Account account, final Avatar avatar, final UiCallback<Avatar> callback) {
		IqPacket packet = AvatarPacketGenerator.generateRetrieveAvatarPacket(avatar);
        XmppSendUtil.sendIqPacket(account, packet, new OnIqPacketReceived() {

            @Override
            public void onIqPacketReceived(Account account, IqPacket result) {
                synchronized (mInProgressAvatarFetches) {
                    mInProgressAvatarFetches.remove(generateFetchKey(account, avatar));
                }
                final String ERROR = account.getJid().toBareJid()
                        + ": fetching avatar for " + avatar.owner + " failed ";
                if (result.getType() == IqPacket.TYPE.RESULT) {
                    avatar.image = AvatarPacketParser.parseAvatarData(result);
                    if (avatar.image != null) {
                        if (AvatarUtil.save(avatar)) {
                            if (account.getJid().toBareJid().equals(avatar.owner)) {
                                if (account.setAvatar(avatar.getFilename())) {
                                    DatabaseBackend.getInstance(ConversationsPlusApplication.getAppContext()).updateAccount(account);
                                }
                                AvatarService.this.clear(account);
                                UiUpdateHelper.updateConversationUi();
								UiUpdateHelper.updateAccountUi();
                            } else {
                                Contact contact = account.getRoster()
                                        .getContact(avatar.owner);
                                contact.setAvatar(avatar);
                                AvatarService.this.clear(contact);
								UiUpdateHelper.updateConversationUi();
								UiUpdateHelper.updateRosterUi();
                            }
                            if (callback != null) {
                                callback.success(avatar);
                            }
                            Logging.d(Config.LOGTAG, account.getJid().toBareJid()
                                    + ": succesfuly fetched pep avatar for " + avatar.owner);
                            return;
                        }
                    } else {

                        Logging.d(Config.LOGTAG, ERROR + "(parsing error)");
                    }
                } else {
                    Element error = result.findChild("error");
                    if (error == null) {
                        Logging.d(Config.LOGTAG, ERROR + "(server error)");
                    } else {
                        Logging.d(Config.LOGTAG, ERROR + error.toString());
                    }
                }
                if (callback != null) {
                    callback.error(0, null);
                }

            }
        });
	}

	private void fetchAvatarVcard(final Account account, final Avatar avatar, final UiCallback<Avatar> callback) {
		IqPacket packet = IqGenerator.retrieveVcardAvatar(avatar);
        XmppSendUtil.sendIqPacket(account, packet, new OnIqPacketReceived() {
            @Override
            public void onIqPacketReceived(Account account, IqPacket packet) {
                synchronized (mInProgressAvatarFetches) {
                    mInProgressAvatarFetches.remove(generateFetchKey(account, avatar));
                }
                if (packet.getType() == IqPacket.TYPE.RESULT) {
                    Element vCard = packet.findChild("vCard", "vcard-temp");
                    Element photo = vCard != null ? vCard.findChild("PHOTO") : null;
                    String image = photo != null ? photo.findChildContent("BINVAL") : null;
                    if (image != null) {
                        avatar.image = image;
                        if (AvatarUtil.save(avatar)) {
                            Logging.d(Config.LOGTAG, account.getJid().toBareJid()
                                    + ": successfully fetched vCard avatar for " + avatar.owner);
                            Contact contact = account.getRoster()
                                    .getContact(avatar.owner);
                            contact.setAvatar(avatar);
                            AvatarService.this.clear(contact);
							UiUpdateHelper.updateConversationUi();
							UiUpdateHelper.updateRosterUi();
                        }
                    }
                }
            }
        });
	}

	public void checkForAvatar(Account account, final UiCallback<Avatar> callback) {
		IqPacket packet = AvatarPacketGenerator.generateRetrieveAvatarMetadataPacket(null);
		XmppSendUtil.sendIqPacket(account, packet, new OnIqPacketReceived() {

            @Override
            public void onIqPacketReceived(Account account, IqPacket packet) {
                if (packet.getType() == IqPacket.TYPE.RESULT) {
                    Element pubsub = packet.findChild("pubsub",
                            "http://jabber.org/protocol/pubsub");
                    if (pubsub != null) {
                        Element items = pubsub.findChild("items");
                        if (items != null) {
                            Avatar avatar = Avatar.parseMetadata(items);
                            if (avatar != null) {
                                avatar.owner = account.getJid().toBareJid();
                                if (AvatarUtil.isAvatarCached(avatar)) {
                                    if (account.setAvatar(avatar.getFilename())) {
                                        DatabaseBackend.getInstance(ConversationsPlusApplication.getAppContext()).updateAccount(account);
                                    }
                                    AvatarService.this.clear(account);
                                    callback.success(avatar);
                                } else {
                                    fetchAvatarPep(account, avatar, callback);
                                }
                                return;
                            }
                        }
                    }
                }
                callback.error(0, null);
            }
        });
	}

	public void fetchAvatar(Account account, Avatar avatar) {
		fetchAvatar(account, avatar, null);
	}

	public void clearFetchInProgress(Account account) {
		synchronized (this.mInProgressAvatarFetches) {
			for(Iterator<String> iterator = this.mInProgressAvatarFetches.iterator(); iterator.hasNext();) {
				final String KEY = iterator.next();
				if (KEY.startsWith(account.getJid().toBareJid()+"_")) {
					iterator.remove();
				}
			}
		}
	}
}