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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 Plac {
	namespace Label {
		public abstract class Node : Object {
			public string text { get; construct; }
		}

		public class Text : Node {
			public Text(string text) {
				Object(text: text);
			}
		}

		public class Link : Node {
			public string id { get; construct; }

			public Link(string id, string text) {
				Object(id: id, text: text);
			}
		}

		public class Parsed : Object {
			public GLib.Array<Node> nodes { get; construct; }

			public string label {
				owned get {
					var builder = new GLib.StringBuilder();
					foreach (var node in nodes.data) {
						builder.append(node.text);
					}

					return builder.free_and_steal();
				}
			}

			public Parsed.from_string(string input) {
				Object(nodes: parse(input));
			}

			private static GLib.Array<Node> parse(string input) {
				var nodes = new GLib.Array<Node>();

				int i = 0;
				while (i < input.length) {
					var link_start = input.index_of("[[", i);
					if (link_start < 0) {
						var node = new Text(input.slice(i, input.length));
						nodes.append_val(node);
						break;
					}

					var link_separator = input.index_of_char('|', link_start);
					if (link_separator < 0) {
						var node = new Text(input.slice(i, input.length));
						nodes.append_val(node);
						break;
					}

					var link_end = input.index_of("]]", link_separator);
					if (link_end < 0) {
						var node = new Text(input.slice(i, input.length));
						nodes.append_val(node);
						break;
					}

					if (link_start > i) {
						var text = new Text(input.slice(i, link_start));
						nodes.append_val(text);
					}

					var id = input.slice(link_start + 2, link_separator);
					var label = input.slice(link_separator + 1, link_end);

					var link = new Link(id, label);
					nodes.append_val(link);

					i = link_end + 2;
				}

				return nodes;
			}
		}
	}
}