package org.ovirt.engine.ui.uicommonweb.models.autocomplete;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.ovirt.engine.core.common.queries.ConfigurationValues;
import org.ovirt.engine.core.compat.ObservableCollection;
import org.ovirt.engine.core.compat.StringHelper;
import org.ovirt.engine.core.searchbackend.ISyntaxChecker;
import org.ovirt.engine.core.searchbackend.SyntaxCheckerFactory;
import org.ovirt.engine.core.searchbackend.SyntaxContainer;
import org.ovirt.engine.core.searchbackend.SyntaxError;
import org.ovirt.engine.core.searchbackend.SyntaxObjectType;
import org.ovirt.engine.ui.uicommonweb.dataprovider.AsyncDataProvider;
import org.ovirt.engine.ui.uicommonweb.models.SearchableListModel;
import org.ovirt.engine.ui.uicompat.ITaskTarget;
import org.ovirt.engine.ui.uicompat.Task;
import org.ovirt.engine.ui.uicompat.TaskContext;

public class SearchSuggestModel extends SearchableListModel implements ITaskTarget
{
    private final ISyntaxChecker syntaxChecker;

    @Override
    public List getItems()
    {
        return (List) super.getItems();
    }

    public void setItems(List value)
    {
        super.setItems(value);
    }

    private String privatePrefix;

    public String getPrefix()
    {
        return privatePrefix;
    }

    public void setPrefix(String value)
    {
        privatePrefix = value;
    }

    /**
     * Gets or sets an array specifying which options will be filtered out from suggestion.
     */
    private String[] privateFilter;

    public String[] getFilter()
    {
        return privateFilter;
    }

    public void setFilter(String[] value)
    {
        privateFilter = value;
    }

    private String[] searchObjectFilter;

    public String[] getSearchObjectFilter()
    {
        return searchObjectFilter;
    }

    public void setSearchObjectFilter(String[] value)
    {
        searchObjectFilter = value;
    }

    public SearchSuggestModel()
    {
        setItems(new ObservableCollection<Object>());

        syntaxChecker =
                SyntaxCheckerFactory.CreateUISyntaxChecker((String)
                        AsyncDataProvider.GetConfigValuePreConverted(ConfigurationValues.AuthenticationMethod));

        setIsTimerDisabled(true);
    }

    @Override
    protected void SearchStringChanged()
    {
        super.SearchStringChanged();
        getSearchCommand().Execute();
    }

    @Override
    protected void AsyncSearch()
    {
        super.AsyncSearch();

        Task.Create(this, null).InvokeUIThread();
    }

    @Override
    protected void SyncSearch()
    {
        super.SyncSearch();
        AsyncSearch();
    }

    public void UpdateOptionsAsync(String search)
    {
        getItems().clear();

        SyntaxContainer syntax = syntaxChecker.getCompletion(search);

        int lastHandledIndex = syntax.getLastHandledIndex();
        String pf = search.substring(0, lastHandledIndex);
        String notHandled = search.substring(lastHandledIndex);

        String[] suggestedItems = syntax.getCompletionArray();

        // Ensure that filtered search objects will invalidate the whole search query
        if (getSearchObjectFilter() != null && syntax.getState() != SyntaxObjectType.BEGIN) {
            for (String value : getSearchObjectFilter()) {
                if (pf.toLowerCase().equals(value.toLowerCase()) || pf.toLowerCase().startsWith(value.toLowerCase() + ":")) { //$NON-NLS-1$
                    addSuggestItem("", SuggestItemPartType.Valid, search, SuggestItemPartType.Erroneous); //$NON-NLS-1$
                    return;
                }
            }
        }

        if (syntax.getError() == SyntaxError.NO_ERROR)
        {
            List<String> actualItems = new ArrayList<String>(Arrays.asList(suggestedItems));

            // Filter search object suggestions
            if (getSearchObjectFilter() != null && syntax.getState() == SyntaxObjectType.BEGIN) {
                for (String value : getSearchObjectFilter()) {
                    for (String item : suggestedItems) {
                        if (item.toLowerCase().equals(value.toLowerCase())) {
                            actualItems.remove(item);
                        }
                    }
                }

                // Ensure that empty search suggestion list invalidates the search query
                if (actualItems.isEmpty()) {
                    addSuggestItem("", SuggestItemPartType.Valid, search, SuggestItemPartType.Erroneous); //$NON-NLS-1$
                    return;
                }
            }

            for (String item : actualItems)
            {
                // Apply filter
                if (getFilter() != null)
                {
                    boolean skipItem = false;
                    for (String value : getFilter())
                    {
                        if (StringHelper.stringsEqual(value.toLowerCase(), item.toLowerCase()))
                        {
                            skipItem = true;
                            break;
                        }
                    }

                    if (skipItem)
                    {
                        continue;
                    }
                }

                String space = ""; //$NON-NLS-1$
                if ((pf.length() > 0) && (!pf.substring(pf.length() - 1, pf.length() - 1 + 1).equals(".")) //$NON-NLS-1$
                        && (!StringHelper.stringsEqual(item, "."))) //$NON-NLS-1$
                {
                    space = " "; //$NON-NLS-1$
                }

                // Patch: monitor-desktop
                if (!item.trim().toLowerCase().startsWith("monitor-desktop")) //$NON-NLS-1$
                {
                    addSuggestItem(StringHelper.trimEnd(pf), SuggestItemPartType.Valid, space + item.trim(), SuggestItemPartType.New);
                }
            }
        }
        else
        {
            addSuggestItem(pf, SuggestItemPartType.Valid, notHandled, SuggestItemPartType.Erroneous);
        }
    }

    private void addSuggestItem(String firstPart, SuggestItemPartType firstPartType,
            String secondPart, SuggestItemPartType secondPartType) {
        SuggestItemPartModel tempVar = new SuggestItemPartModel();
        tempVar.setPartString(firstPart);
        tempVar.setPartType(firstPartType);
        SuggestItemPartModel tempVar2 = new SuggestItemPartModel();
        tempVar2.setPartString(secondPart);
        tempVar2.setPartType(secondPartType);
        ArrayList<SuggestItemPartModel> parts =
                new ArrayList<SuggestItemPartModel>(Arrays.asList(new SuggestItemPartModel[] {
                        tempVar, tempVar2 }));
        getItems().add(parts);
    }

    @Override
    protected void OnSelectedItemChanged()
    {
        super.OnSelectedItemChanged();

        List selectedItem = (List) getSelectedItem();
        if (selectedItem != null)
        {
            // SearchString = String.Join(String.Empty,
            // selectedItem
            // .Cast<SuggestItemPartModel>()
            // .Select(a => a.PartString)
            // .ToArray()
            // );
            ArrayList<String> items = new ArrayList<String>();
            for (Object item : selectedItem)
            {
                SuggestItemPartModel i = (SuggestItemPartModel) item;
                items.add(i.getPartString());
            }

            String searchString = StringHelper.join("", items.toArray(new String[] {})); //$NON-NLS-1$
            // If there prefix exist, don't transfer it back as a part of search string.
            if (getPrefix() != null)
            {
                searchString = searchString.substring(getPrefix().length());
            }

            setSearchString(searchString);
        }
    }

    @Override
    public void run(TaskContext context)
    {
        UpdateOptionsAsync(getPrefix() + getSearchString());
    }

    @Override
    protected String getListName() {
        return "SearchSuggestModel"; //$NON-NLS-1$
    }
}
