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// Copyright 2025 Shota FUJI
//
// Licensed 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.
//
// SPDX-License-Identifier: Apache-2.0

namespace Moo {
	public errordomain JsonBodyParseError {
		NO_PARSING_CONTEXT,
		CONTENT_LENGTH_MISMATCH,
		CONTENT_TYPE_MISMATCH,
	}

	public class JsonBody : Object {
		public string data { get; construct; }

		public JsonBody.from_string(string src, Headers headers) throws JsonBodyParseError {
			if (headers.last_byte_index < 0) {
				throw new JsonBodyParseError.NO_PARSING_CONTEXT("Headers does not contain parsed length.");
			}

			if (headers.content_length == 0) {
				throw new JsonBodyParseError.CONTENT_LENGTH_MISMATCH("Content-Length is zero or missing.");
			}

			if (headers.content_type == null) {
				throw new JsonBodyParseError.CONTENT_TYPE_MISMATCH("Content-Type is missing.");
			}

			if (headers.content_type != "application/json") {
				throw new JsonBodyParseError.CONTENT_TYPE_MISMATCH("Content-Type is not application/json.");
			}

			var body = src.slice(headers.last_byte_index, src.length);
			if (body.length != headers.content_length) {
				throw new JsonBodyParseError.CONTENT_LENGTH_MISMATCH("Body size does not match the declared one.");
			}

			Object(data: body);
		}
	}
}