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package com.questdb.query.spi;

import com.questdb.Journal;
import com.questdb.Partition;
import com.questdb.ex.JournalException;
import com.questdb.ex.JournalRuntimeException;
import com.questdb.iter.*;
import com.questdb.misc.Interval;
import com.questdb.misc.Rows;
import com.questdb.query.OrderedResultSet;
import com.questdb.query.OrderedResultSetBuilder;
import com.questdb.query.api.QueryAll;
import com.questdb.query.api.QueryAllBuilder;
import com.questdb.std.ObjList;

import java.util.Iterator;

public class QueryAllImpl implements QueryAll {

    private final Journal journal;

    public QueryAllImpl(Journal journal) {
        this.journal = journal;
    }

    @Override
    public OrderedResultSet asResultSet() throws JournalException {
        return journal.iteratePartitions(new OrderedResultSetBuilder() {
            @Override
            public void read(long lo, long hi) throws JournalException {
                result.ensureCapacity((int) (hi - lo + 1));
                for (long i = lo; i < hi + 1; i++) {
                    result.add(Rows.toRowID(partition.getPartitionIndex(), i));
                }
            }
        });
    }

    @Override
    public JournalPeekingIterator bufferedIterator() {
        return new JournalBufferedIterator<>(journal, createRanges());
    }

    @Override
    public JournalPeekingIterator bufferedIterator(Interval interval) {
        return new JournalBufferedIterator<>(journal, createRanges(interval));
    }

    @Override
    public JournalPeekingIterator bufferedIterator(long rowid) {
        return new JournalBufferedIterator<>(journal, createRanges(rowid));
    }

    @Override
    public JournalConcurrentIterator concurrentIterator() {
        return new JournalConcurrentIterator<>(journal, createRanges(), 1024);
    }

    @Override
    public JournalConcurrentIterator concurrentIterator(Interval interval) {
        return new JournalConcurrentIterator<>(journal, createRanges(interval), 1024);
    }

    @Override
    public JournalConcurrentIterator concurrentIterator(long rowid) {
        return new JournalConcurrentIterator<>(journal, createRanges(rowid), 1024);
    }

    @Override
    public JournalPeekingIterator incrementBufferedIterator() {
        try {
            long lo = journal.getMaxRowID();
            journal.refresh();
            return new JournalBufferedIterator<>(journal, createRanges(journal.incrementRowID(lo)));
        } catch (JournalException e) {
            throw new JournalRuntimeException(e);
        }
    }

    @Override
    public JournalPeekingIterator incrementIterator() {
        try {
            long lo = journal.getMaxRowID();
            journal.refresh();
            return new JournalIteratorImpl<>(journal, createRanges(journal.incrementRowID(lo)));
        } catch (JournalException e) {
            throw new JournalRuntimeException(e);
        }
    }

    @Override
    public JournalIterator iterator(Interval interval) {
        return new JournalIteratorImpl<>(journal, createRanges(interval));
    }

    @Override
    public JournalPeekingIterator iterator(long rowid) {
        return new JournalIteratorImpl<>(journal, createRanges(rowid));
    }

    @Override
    public long size() {
        try {
            return journal.size();
        } catch (JournalException e) {
            throw new JournalRuntimeException(e);
        }
    }

    @Override
    public QueryAllBuilder withKeys(String... values) {
        return withSymValues(journal.getMetadata().getKeyColumn(), values);
    }

    @Override
    public QueryAllBuilder withSymValues(String symbol, String... values) {
        QueryAllBuilderImpl result = new QueryAllBuilderImpl<>(journal);
        result.setSymbol(symbol, values);
        return result;
    }

    @Override
    public Iterator iterator() {
        return new JournalIteratorImpl<>(journal, createRanges());
    }

    private ObjList createRanges() {
        final int partitionCount = journal.getPartitionCount();
        ObjList ranges = new ObjList<>(partitionCount);
        try {
            for (int i = 0; i < partitionCount; i++) {
                Partition p = journal.getPartition(i, true);
                long size = p.size();
                if (size > 0) {
                    ranges.add(new JournalIteratorRange(p.getPartitionIndex(), 0, size - 1));
                }
            }
        } catch (JournalException e) {
            throw new JournalRuntimeException(e);
        }
        return ranges;
    }

    private ObjList createRanges(Interval interval) {
        final ObjList ranges = new ObjList<>();
        try {
            journal.iteratePartitions(new OrderedResultSetBuilder(interval) {
                @Override
                public void read(long lo, long hi) throws JournalException {
                    ranges.add(new JournalIteratorRange(partition.getPartitionIndex(), lo, hi));
                }
            });
        } catch (JournalException e) {
            throw new JournalRuntimeException(e);
        }
        return ranges;
    }

    private ObjList createRanges(long lo) {
        ObjList ranges = new ObjList<>();
        int loPartitionID = Rows.toPartitionIndex(lo);
        long loLocalRowID = Rows.toLocalRowID(lo);

        try {
            int count = journal.getPartitionCount();
            for (int i = loPartitionID; i < count; i++) {
                long localRowID = 0;
                if (i == loPartitionID) {
                    localRowID = loLocalRowID;
                }

                Partition p = journal.getPartition(i, true);
                long size = p.size();
                if (size > 0) {
                    ranges.add(new JournalIteratorRange(p.getPartitionIndex(), localRowID, size - 1));
                }
            }
            return ranges;
        } catch (JournalException e) {
            throw new JournalRuntimeException(e);
        }
    }
}