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 * to you 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
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package com.netease.arctic.shade.org.apache.iceberg;

import java.util.List;
import java.util.Set;
import com.netease.arctic.shade.org.apache.iceberg.events.IncrementalScanEvent;
import com.netease.arctic.shade.org.apache.iceberg.events.Listeners;
import com.netease.arctic.shade.org.apache.iceberg.io.CloseableIterable;
import com.netease.arctic.shade.org.apache.iceberg.relocated.com.google.common.base.Preconditions;
import com.netease.arctic.shade.org.apache.iceberg.relocated.com.google.common.collect.FluentIterable;
import com.netease.arctic.shade.org.apache.iceberg.relocated.com.google.common.collect.Iterables;
import com.netease.arctic.shade.org.apache.iceberg.relocated.com.google.common.collect.Lists;
import com.netease.arctic.shade.org.apache.iceberg.relocated.com.google.common.collect.Sets;
import com.netease.arctic.shade.org.apache.iceberg.util.SnapshotUtil;
import com.netease.arctic.shade.org.apache.iceberg.util.ThreadPools;

class IncrementalDataTableScan extends DataTableScan {

  IncrementalDataTableScan(TableOperations ops, Table table, Schema schema, TableScanContext context) {
    super(ops, table, schema, context.useSnapshotId(null));
    validateSnapshotIds(table, context.fromSnapshotId(), context.toSnapshotId());
  }

  @Override
  public TableScan asOfTime(long timestampMillis) {
    throw new UnsupportedOperationException(String.format(
        "Cannot scan table as of time %s: configured for incremental data in snapshots (%s, %s]",
        timestampMillis, context().fromSnapshotId(), context().toSnapshotId()));
  }

  @Override
  public TableScan useSnapshot(long scanSnapshotId) {
    throw new UnsupportedOperationException(String.format(
        "Cannot scan table using scan snapshot id %s: configured for incremental data in snapshots (%s, %s]",
        scanSnapshotId, context().fromSnapshotId(), context().toSnapshotId()));
  }

  @Override
  public TableScan appendsBetween(long fromSnapshotId, long toSnapshotId) {
    validateSnapshotIdsRefinement(fromSnapshotId, toSnapshotId);
    return new IncrementalDataTableScan(tableOps(), table(), schema(),
        context().fromSnapshotId(fromSnapshotId).toSnapshotId(toSnapshotId));
  }

  @Override
  public TableScan appendsAfter(long newFromSnapshotId) {
    final Snapshot currentSnapshot = table().currentSnapshot();
    Preconditions.checkState(currentSnapshot != null,
        "Cannot scan appends after %s, there is no current snapshot", newFromSnapshotId);
    return appendsBetween(newFromSnapshotId, currentSnapshot.snapshotId());
  }

  @Override
  public CloseableIterable planFiles() {
    List snapshots = snapshotsWithin(table(),
        context().fromSnapshotId(), context().toSnapshotId());
    Set snapshotIds = Sets.newHashSet(Iterables.transform(snapshots, Snapshot::snapshotId));
    Set manifests = FluentIterable
        .from(snapshots)
        .transformAndConcat(Snapshot::dataManifests)
        .filter(manifestFile -> snapshotIds.contains(manifestFile.snapshotId()))
        .toSet();

    ManifestGroup manifestGroup = new ManifestGroup(tableOps().io(), manifests)
        .caseSensitive(isCaseSensitive())
        .select(colStats() ? SCAN_WITH_STATS_COLUMNS : SCAN_COLUMNS)
        .filterData(filter())
        .filterManifestEntries(
            manifestEntry ->
                snapshotIds.contains(manifestEntry.snapshotId()) &&
                manifestEntry.status() == ManifestEntry.Status.ADDED)
        .specsById(tableOps().current().specsById())
        .ignoreDeleted();

    if (shouldIgnoreResiduals()) {
      manifestGroup = manifestGroup.ignoreResiduals();
    }

    Listeners.notifyAll(new IncrementalScanEvent(table().name(), context().fromSnapshotId(),
        context().toSnapshotId(), context().rowFilter(), schema()));

    if (PLAN_SCANS_WITH_WORKER_POOL && manifests.size() > 1) {
      manifestGroup = manifestGroup.planWith(ThreadPools.getWorkerPool());
    }

    return manifestGroup.planFiles();
  }

  @Override
  @SuppressWarnings("checkstyle:HiddenField")
  protected TableScan newRefinedScan(TableOperations ops, Table table, Schema schema, TableScanContext context) {
    return new IncrementalDataTableScan(ops, table, schema, context);
  }

  private static List snapshotsWithin(Table table, long fromSnapshotId, long toSnapshotId) {
    List snapshots = Lists.newArrayList();
    for (Snapshot snapshot : SnapshotUtil.ancestorsBetween(toSnapshotId, fromSnapshotId, table::snapshot)) {
      // for now, incremental scan supports only appends
      if (snapshot.operation().equals(DataOperations.APPEND)) {
        snapshots.add(snapshot);
      } else if (snapshot.operation().equals(DataOperations.OVERWRITE)) {
        throw new UnsupportedOperationException(
            String.format("Found %s operation, cannot support incremental data in snapshots (%s, %s]",
                DataOperations.OVERWRITE, fromSnapshotId, toSnapshotId));
      }
    }
    return snapshots;
  }

  private void validateSnapshotIdsRefinement(long newFromSnapshotId, long newToSnapshotId) {
    Set snapshotIdsRange = Sets.newHashSet(
        SnapshotUtil.ancestorIdsBetween(context().toSnapshotId(), context().fromSnapshotId(), table()::snapshot));
    // since snapshotIdsBetween return ids in range (fromSnapshotId, toSnapshotId]
    snapshotIdsRange.add(context().fromSnapshotId());
    Preconditions.checkArgument(
        snapshotIdsRange.contains(newFromSnapshotId),
        "from snapshot id %s not in existing snapshot ids range (%s, %s]",
        newFromSnapshotId, context().fromSnapshotId(), newToSnapshotId);
    Preconditions.checkArgument(
        snapshotIdsRange.contains(newToSnapshotId),
        "to snapshot id %s not in existing snapshot ids range (%s, %s]",
        newToSnapshotId, context().fromSnapshotId(), context().toSnapshotId());
  }

  private static void validateSnapshotIds(Table table, long fromSnapshotId, long toSnapshotId) {
    Preconditions.checkArgument(fromSnapshotId != toSnapshotId, "from and to snapshot ids cannot be the same");
    Preconditions.checkArgument(
        table.snapshot(fromSnapshotId) != null, "from snapshot %s does not exist", fromSnapshotId);
    Preconditions.checkArgument(
        table.snapshot(toSnapshotId) != null, "to snapshot %s does not exist", toSnapshotId);
    Preconditions.checkArgument(SnapshotUtil.isAncestorOf(table, toSnapshotId, fromSnapshotId),
        "from snapshot %s is not an ancestor of to snapshot  %s", fromSnapshotId, toSnapshotId);
  }
}