/*
 * Copyright 2015 ScyllaDB
 */

/*
 * This file is part of Scylla.
 *
 * Scylla is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Scylla is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Scylla.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "schema_mutations.hh"
#include "canonical_mutation.hh"
#include "db/schema_tables.hh"
#include "md5_hasher.hh"

schema_mutations::schema_mutations(canonical_mutation columnfamilies,
                                   canonical_mutation columns,
                                   bool is_view,
                                   stdx::optional<canonical_mutation> indices,
                                   stdx::optional<canonical_mutation> dropped_columns,
                                   stdx::optional<canonical_mutation> scylla_tables)
    : _columnfamilies(columnfamilies.to_mutation(is_view ? db::schema_tables::views() : db::schema_tables::tables()))
    , _columns(columns.to_mutation(db::schema_tables::columns()))
    , _indices(indices ? mutation_opt{indices.value().to_mutation(db::schema_tables::indexes())} : stdx::nullopt)
    , _dropped_columns(dropped_columns ? mutation_opt{dropped_columns.value().to_mutation(db::schema_tables::dropped_columns())} : stdx::nullopt)
    , _scylla_tables(scylla_tables ? mutation_opt{scylla_tables.value().to_mutation(db::schema_tables::scylla_tables())} : stdx::nullopt)
{}

void schema_mutations::copy_to(std::vector<mutation>& dst) const {
    dst.push_back(_columnfamilies);
    dst.push_back(_columns);
    if (_indices) {
        dst.push_back(*_indices);
    }
    if (_dropped_columns) {
        dst.push_back(*_dropped_columns);
    }
    if (_scylla_tables) {
        dst.push_back(*_scylla_tables);
    }
}

table_schema_version schema_mutations::digest() const {
    if (_scylla_tables) {
        auto rs = query::result_set(*_scylla_tables);
        if (!rs.empty()) {
            auto&& row = rs.row(0);
            if (row.has("version")) {
                auto val = row.get<utils::UUID>("version");
                if (val) {
                    return *val;
                }
            }
        }
    }

    md5_hasher h;
    db::schema_tables::feed_hash_for_schema_digest(h, _columnfamilies);
    db::schema_tables::feed_hash_for_schema_digest(h, _columns);
    if (_indices && !_indices->partition().empty()) {
        db::schema_tables::feed_hash_for_schema_digest(h, *_indices);
    }
    if (_dropped_columns && !_dropped_columns->partition().empty()) {
        db::schema_tables::feed_hash_for_schema_digest(h, *_dropped_columns);
    }
    if (_scylla_tables) {
        db::schema_tables::feed_hash_for_schema_digest(h, *_scylla_tables);
    }
    return utils::UUID_gen::get_name_UUID(h.finalize());
}

static mutation_opt compact(const mutation_opt& m) {
    if (!m) {
        return m;
    }
    return db::schema_tables::compact_for_schema_digest(*m);
}

static mutation_opt compact(const mutation& m) {
    return db::schema_tables::compact_for_schema_digest(m);
}

bool schema_mutations::operator==(const schema_mutations& other) const {
    return compact(_columnfamilies) == compact(other._columnfamilies)
           && compact(_columns) == compact(other._columns)
           && compact(_indices) == compact(other._indices)
           && compact(_dropped_columns) == compact(other._dropped_columns)
           && compact(_scylla_tables) == compact(other._scylla_tables)
           ;
}

bool schema_mutations::operator!=(const schema_mutations& other) const {
    return !(*this == other);
}

bool schema_mutations::live() const {
    return _columnfamilies.live_row_count() > 0 || _columns.live_row_count() > 0;
}

bool schema_mutations::is_view() const {
    return _columnfamilies.schema() == db::schema_tables::views();
}