// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// 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

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.

#include "format/table/iceberg/schema.h"

#include <functional>

namespace doris::iceberg {

const std::string Schema::ALL_COLUMNS = "*";

const int Schema::DEFAULT_SCHEMA_ID = 0;

Schema::Schema(int schema_id, std::vector<NestedField> columns)

        : _schema_id(schema_id), _root_struct(std::move(columns)) {

    FieldPath path;

    std::function<void(const NestedField&)> index_field = [&](const NestedField& field) {

        path.push_back(&field);

        _id_to_field[field.field_id()] = &field;

        _id_to_field_path[field.field_id()] = path;

        Type* type = field.field_type();

        if (type->is_struct_type()) {

            for (const auto& child : type->as_struct_type()->fields()) {

                index_field(child);

            }

        } else if (type->is_list_type()) {

            index_field(type->as_list_type()->element_field());

        } else if (type->is_map_type()) {

            index_field(type->as_map_type()->key_field());

            index_field(type->as_map_type()->value_field());

        }

        path.pop_back();

    };

    for (const auto& field : _root_struct.fields()) {

        index_field(field);

    }

}

Schema::Schema(std::vector<NestedField> columns) : Schema(DEFAULT_SCHEMA_ID, std::move(columns)) {}

Type* Schema::find_type(int id) const {

    auto it = _id_to_field.find(id);

    if (it != _id_to_field.end()) {

        return it->second->field_type();

    }

    return nullptr;

}

const NestedField* Schema::find_field(int id) const {

    auto it = _id_to_field.find(id);

    if (it != _id_to_field.end()) {

        return it->second;

    }

    return nullptr;

}

const Schema::FieldPath* Schema::find_field_path(int id) const {

    auto it = _id_to_field_path.find(id);

    return it == _id_to_field_path.end() ? nullptr : &it->second;

}

} // namespace doris::iceberg