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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 HeadersParseError {
		NO_PARSING_CONTEXT,
		NO_DELIMITER,
		EMPTY_KEY,
		NON_ASCII_KEY,
		NON_UTF8_VALUE,
	}

	public class Headers : Object {
		private Gee.HashMap<string, Gee.ArrayList<string> >map;

		public int last_byte_index { get; construct; default = -1; }

		public int size { get { return map.size; } }

		public string? content_type {
			owned get {
				var entry = map["content-type"];
				if (entry == null) {
					return null;
				}

				return entry[0];
			}
		}

		public uint64 content_length {
			get {
				var entry = map["content-length"];
				if (entry == null) {
					return 0;
				}

				var value = entry[0];
				if (value == null) {
					return 0;
				}

				return uint64.parse(value);
			}
		}

		public uint64 request_id {
			get {
				var entry = map["request-id"];
				if (entry == null) {
					return 0;
				}

				var value = entry[0];
				if (value == null) {
					return 0;
				}

				return uint64.parse(value);
			}
		}

		/**
		 * Parses `src`.
		 *
		 * Header keys will be ASCII lowercased.
		 *
		 * Throws an `NO_PARSING_CONTEXT` if `meta` is not created by
		 * `Metadata.from_string()`.
		 */
		public Headers.from_string(string src, Metadata meta) throws HeadersParseError {
			if (meta.last_byte_index < 0) {
				throw new HeadersParseError.NO_PARSING_CONTEXT("Metadata does not contain parsed length.");
			}

			var map = new Gee.HashMap<string, Gee.ArrayList<string> >();

			int i = meta.last_byte_index;

			while (i + 1 <= src.length) {
				var lf = src.index_of_char('\n', i);
				if (lf == i) {
					i += 1;
					break;
				}

				var line = src.slice(i, lf < 0 ? src.length : lf);
				i = lf < 0 ? i + line.length : lf + 1;

				var parts = line.split(":", 2);
				if (parts.length < 2) {
					throw new HeadersParseError.NO_DELIMITER("Header delimiter does not found.");
				}

				var key = parts[0].ascii_down().strip();
				if (key.length == 0) {
					throw new HeadersParseError.EMPTY_KEY("Found an empty header key.");
				}
				if (!key.is_ascii()) {
					throw new HeadersParseError.NON_ASCII_KEY("Found a header key containing non-ASCII character.");
				}

				var value = parts[1].strip();
				if (!value.validate()) {
					throw new HeadersParseError.NON_UTF8_VALUE("Found a header with non-UTF8 value.");
				}

				var existing = map[key];
				if (existing != null) {
					existing.add(value);
				} else {
					var entry = new Gee.ArrayList<string>();
					entry.add(value);
					map[key] = entry;
				}
			}

			Object(last_byte_index: i);
			this.map = map;
		}

		public new Gee.ArrayList<string>? @get(string key) {
			return map[key];
		}
	}
}