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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

using GLib;

namespace Moo {
	namespace Tests {
		public void add_headers_tests() {
			Test.add_func("/libmoo/headers/parse-single", () => {
				try {
					var input = "MOO/1 REQUEST foo/bar\nFoo: Bar\n";

					var metadata = new Metadata.from_string(input);
					var headers = new Headers.from_string(input, metadata);

					assert(headers.size == 1);
					assert(headers["Foo"].size == 1);
					assert(headers["Foo"][0] == "Bar");
					assert(headers.last_byte_index == input.length);
				} catch (Error e) {
					assert_no_error(e);
				}
			});

			Test.add_func("/libmoo/headers/parse-multi", () => {
				try {
					var input = """MOO/1 REQUEST foo/bar
					Foo: foo-value
					bar:bar-value
					baZ: baz-value
""";

					var metadata = new Metadata.from_string(input);
					var headers = new Headers.from_string(input, metadata);

					assert(headers.size == 3);
					assert(headers["Foo"][0] == "foo-value");
					assert(headers["bar"][0] == "bar-value");
					assert(headers["baZ"][0] == "baz-value");
					assert(headers.last_byte_index == input.length);
				} catch (Error e) {
					assert_no_error(e);
				}
			});

			Test.add_func("/libmoo/headers/parse-without-last-lf", () => {
				try {
					var input = "MOO/1 REQUEST foo/bar\nFoo: Bar";

					var metadata = new Metadata.from_string(input);
					var headers = new Headers.from_string(input, metadata);

					assert(headers.size == 1);
					assert(headers["Foo"].size == 1);
					assert(headers["Foo"][0] == "Bar");
					assert(headers.last_byte_index == input.length);
				} catch (Error e) {
					assert_no_error(e);
				}
			});

			Test.add_func("/libmoo/headers/empty-inputs", () => {
				string[] fixtures = {
					"MOO/1 REQUEST foo/bar\n",
					"MOO/1 REQUEST foo/bar\n\n",
					"MOO/1 REQUEST foo/bar\n\n\n"
				};

				foreach (var fixture in fixtures) {
					try {
						var metadata = new Metadata.from_string(fixture);
						var headers = new Headers.from_string(fixture, metadata);

						assert(headers.size == 0);
					} catch (Error e) {
						assert_no_error(e);
					}
				}
			});

			Test.add_func("/libmoo/headers/reject-empty-keys", () => {
				string[] fixtures = {
					"MOO/1 REQUEST foo/bar\n: Value",
					"MOO/1 REQUEST foo/bar\n : Value",
				};

				foreach (var fixture in fixtures) {
					try {
						var metadata = new Metadata.from_string(fixture);
						new Headers.from_string(fixture, metadata);

						message("Expected an error, but parsing succeeded");
						assert_not_reached();
					} catch (HeadersParseError e) {
						if (!(e is HeadersParseError.EMPTY_KEY)) {
							message(
								"Expected an EMPTY_KEY(%d), got %d",
								HeadersParseError.EMPTY_KEY, e.code
							);
							assert_not_reached();
						}
					} catch (Error e) {
						assert_no_error(e);
					}
				}
			});

			Test.add_func("/libmoo/headers/serialize-back", () => {
				try {
					var input = "MOO/1 REQUEST foo/bar\nfoo: Bar\nbaz: Qux\n";

					var metadata = new Metadata.from_string(input);
					var headers = new Headers.from_string(input, metadata);

					var serialized = @"$metadata$headers";
					var metadata_after = new Metadata.from_string(serialized);
					var headers_after = new Headers.from_string(serialized, metadata_after);

					assert(headers.size == headers_after.size);
					assert(headers["foo"][0] == headers_after["foo"][0]);
					assert(headers["baz"][0] == headers_after["baz"][0]);
				} catch (Error e) {
					assert_no_error(e);
				}
			});
		}
	}
}