package org.tasks.filters;

import android.content.Context;
import android.content.res.Resources;

import com.todoroo.andlib.sql.Criterion;
import com.todoroo.andlib.sql.Field;
import com.todoroo.andlib.sql.Join;
import com.todoroo.andlib.sql.Query;
import com.todoroo.astrid.api.CustomFilterCriterion;
import com.todoroo.astrid.api.MultipleSelectCriterion;
import com.todoroo.astrid.api.PermaSql;
import com.todoroo.astrid.api.TextInputCriterion;
import com.todoroo.astrid.dao.TaskDao;
import com.todoroo.astrid.data.TagData;
import com.todoroo.astrid.data.Task;
import com.todoroo.astrid.gtasks.GtasksList;
import com.todoroo.astrid.gtasks.GtasksListService;
import com.todoroo.astrid.tags.TagService;

import org.tasks.R;
import org.tasks.data.GoogleTask;
import org.tasks.data.Tag;
import org.tasks.gtasks.SyncAdapterHelper;
import org.tasks.injection.ForApplication;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.inject.Inject;

import static com.google.common.collect.Iterables.transform;
import static com.google.common.collect.Lists.newArrayList;
import static com.google.common.collect.Sets.newLinkedHashSet;

public class FilterCriteriaProvider {

    private static final String IDENTIFIER_TITLE = "title"; //$NON-NLS-1$
    private static final String IDENTIFIER_IMPORTANCE = "importance"; //$NON-NLS-1$
    private static final String IDENTIFIER_DUEDATE = "dueDate"; //$NON-NLS-1$
    private static final String IDENTIFIER_GTASKS = "gtaskslist"; //$NON-NLS-1$
    private static final String IDENTIFIER_TAG_IS = "tag_is"; //$NON-NLS-1$
    private static final String IDENTIFIER_TAG_CONTAINS = "tag_contains"; //$NON-NLS-1$

    private final Context context;
    private final TagService tagService;
    private final GtasksListService gtasksListService;
    private final Resources r;
    private final SyncAdapterHelper syncAdapterHelper;

    @Inject
    public FilterCriteriaProvider(@ForApplication Context context, TagService tagService,
                                  GtasksListService gtasksListService, SyncAdapterHelper syncAdapterHelper) {
        this.context = context;
        this.tagService = tagService;
        this.gtasksListService = gtasksListService;
        this.syncAdapterHelper = syncAdapterHelper;

        r = context.getResources();
    }

    public List<CustomFilterCriterion> getAll() {
        List<CustomFilterCriterion> result = newArrayList();

        result.add(getTagFilter());
        result.add(getTagNameContainsFilter());
        result.add(getDueDateFilter());
        result.add(getImportanceFilter());
        result.add(getTaskTitleContainsFilter());
        if (syncAdapterHelper.isEnabled()) {
            result.add(getGtasksFilterCriteria());
        }

        return result;
    }

    private CustomFilterCriterion getTagFilter() {
        // TODO: adding to hash set because duplicate tag name bug hasn't been fixed yet
        List<String> tags = newArrayList(newLinkedHashSet(transform(tagService.getTagList(), TagData::getName)));
        String[] tagNames = tags.toArray(new String[tags.size()]);
        Map<String, Object> values = new HashMap<>();
        values.put(Tag.KEY, "?");
        return new MultipleSelectCriterion(
                IDENTIFIER_TAG_IS,
                context.getString(R.string.CFC_tag_text),
                Query.select(Field.field("task")).from(Tag.TABLE).join(Join.inner(
                        Task.TABLE, Field.field("task").eq(Task.ID))).where(Criterion.and(
                        TaskDao.TaskCriteria.activeAndVisible(),
                        Field.field("name").eq("?"))).toString(),
                values, tagNames, tagNames,
                null,
                context.getString(R.string.CFC_tag_name));
    }

    private CustomFilterCriterion getTagNameContainsFilter() {
        return new TextInputCriterion(
                IDENTIFIER_TAG_CONTAINS,
                context.getString(R.string.CFC_tag_contains_text),
                Query.select(Field.field("task")).from(Tag.TABLE).join(Join.inner(
                        Task.TABLE, Field.field("task").eq(Task.ID))).where(Criterion.and(
                        TaskDao.TaskCriteria.activeAndVisible(),
                        Field.field("name").like("%?%"))).toString(),
                context.getString(R.string.CFC_tag_contains_name), "",
                null,
                context.getString(R.string.CFC_tag_contains_name));
    }

    private CustomFilterCriterion getDueDateFilter() {
        String[] entryValues = new String[] {
                "0",
                PermaSql.VALUE_EOD_YESTERDAY,
                PermaSql.VALUE_EOD,
                PermaSql.VALUE_EOD_TOMORROW,
                PermaSql.VALUE_EOD_DAY_AFTER,
                PermaSql.VALUE_EOD_NEXT_WEEK,
                PermaSql.VALUE_EOD_NEXT_MONTH,
        };
        Map<String, Object> values = new HashMap<>();
        values.put(Task.DUE_DATE.name, "?");
        return new MultipleSelectCriterion(
                IDENTIFIER_DUEDATE,
                r.getString(R.string.CFC_dueBefore_text),
                Query.select(Task.ID).from(Task.TABLE).where(
                        Criterion.and(
                                TaskDao.TaskCriteria.activeAndVisible(),
                                Criterion.or(
                                        Field.field("?").eq(0),
                                        Task.DUE_DATE.gt(0)),
                                Task.DUE_DATE.lte("?"))).toString(),
                values, r.getStringArray(R.array.CFC_dueBefore_entries),
                entryValues, null,
                r.getString(R.string.CFC_dueBefore_name));
    }

    private CustomFilterCriterion getImportanceFilter() {
        String[] entryValues = new String[] {
                Integer.toString(Task.IMPORTANCE_DO_OR_DIE),
                Integer.toString(Task.IMPORTANCE_MUST_DO),
                Integer.toString(Task.IMPORTANCE_SHOULD_DO),
                Integer.toString(Task.IMPORTANCE_NONE),
        };
        String[] entries = new String[] {
                "!!!", "!!", "!", "o"
        };
        Map<String, Object> values = new HashMap<>();
        values.put(Task.IMPORTANCE.name, "?");
        return new MultipleSelectCriterion(
                IDENTIFIER_IMPORTANCE,
                r.getString(R.string.CFC_importance_text),
                Query.select(Task.ID).from(Task.TABLE).where(
                        Criterion.and(TaskDao.TaskCriteria.activeAndVisible(),
                                Task.IMPORTANCE.lte("?"))).toString(),
                values, entries,
                entryValues, null,
                r.getString(R.string.CFC_importance_name));
    }

    private CustomFilterCriterion getTaskTitleContainsFilter() {
        return new TextInputCriterion(
                IDENTIFIER_TITLE,
                r.getString(R.string.CFC_title_contains_text),
                Query.select(Task.ID).from(Task.TABLE).where(
                        Criterion.and(TaskDao.TaskCriteria.activeAndVisible(),
                                Task.TITLE.like("%?%"))).toString(),
                r.getString(R.string.CFC_title_contains_name), "",
                null,
                r.getString(R.string.CFC_title_contains_name));
    }

    private CustomFilterCriterion getGtasksFilterCriteria() {
        List<GtasksList> lists = gtasksListService.getLists();

        String[] listNames = new String[lists.size()];
        String[] listIds = new String[lists.size()];
        for (int i = 0; i < lists.size(); i++) {
            listNames[i] = lists.get(i).getName();
            listIds[i] = lists.get(i).getRemoteId();
        }

        Map<String, Object> values = new HashMap<>();
        values.put(GoogleTask.KEY, "?");

        return new MultipleSelectCriterion(
                IDENTIFIER_GTASKS,
                context.getString(R.string.CFC_gtasks_list_text),
                Query.select(Field.field("task")).from(GoogleTask.TABLE)
                        .join(Join.inner(Task.TABLE, Field.field("task").eq(Task.ID)))
                        .where(Criterion.and(
                                TaskDao.TaskCriteria.activeAndVisible(),
                                Field.field("list_id").eq("?"))).toString(),
                values,
                listNames,
                listIds,
                null,
                context.getString(R.string.CFC_gtasks_list_name));
    }
}