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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

import Testing

@testable import RoonKit

@Suite("MOO message decode tests")
struct MooMessageDecodeTests {
	@Test func acceptsMetadataOnlyMessage() throws {
		let msg = try Moo(from: "MOO/1 REQUEST foo/bar\n")

		#expect(msg.schemaVersion == 1)
		#expect(msg.verb == "REQUEST")
		#expect(msg.service == "foo/bar")
		#expect(msg.headers == [:])
		#expect(msg.body == .none)
	}

	@Test func rejectsEmptyMessage() {
		#expect(throws: MooMessageDecodeError.signatureMismatch) {
			let _ = try Moo(from: "")
		}
	}

	@Test func rejectsInvalidSignature() {
		#expect(throws: MooMessageDecodeError.signatureMismatch) {
			let _ = try Moo(from: "MOO1 REQUEST foo/bar\n")
		}
	}

	@Test func rejectsInvalidVersion() {
		#expect(throws: MooMessageDecodeError.invalidVersion) {
			let _ = try Moo(from: "MOO/1.0 REQUEST foo/bar\n")
		}

		#expect(throws: MooMessageDecodeError.invalidVersion) {
			let _ = try Moo(from: "MOO/-1 REQUEST foo/bar\n")
		}

		#expect(throws: MooMessageDecodeError.invalidVersion) {
			let _ = try Moo(from: "MOO/ REQUEST foo/bar\n")
		}

		#expect(throws: MooMessageDecodeError.invalidVersion) {
			let _ = try Moo(from: "MOO/0x1 REQUEST foo/bar\n")
		}

		#expect(throws: MooMessageDecodeError.invalidVersion) {
			let _ = try Moo(from: "MOO/one REQUEST foo/bar\n")
		}
	}

	@Test func acceptsMessageWithoutBody() throws {
		let msg = try Moo(
			from:
				"MOO/1 REQUEST foo/bar\nRequest-Id: 5\nAccept-Encoding:application/json;charset=utf-8\n\n"
		)

		#expect(msg.schemaVersion == 1)
		#expect(msg.verb == "REQUEST")
		#expect(msg.service == "foo/bar")
		#expect(msg.headers.count == 2)
		#expect(msg.headers["Request-Id"] == .some("5"))
		#expect(
			msg.headers["Accept-Encoding"] == .some("application/json;charset=utf-8")
		)
		#expect(msg.body == .none)
	}

	@Test func acceptsFullMessage() throws {
		let msg = try Moo(
			from:
				"MOO/1 REQUEST foo/bar\nRequest-Id: 5\nContent-Type:application/json;charset=utf-8\n\n{\"foo\":\"bar\"}"
		)

		#expect(msg.schemaVersion == 1)
		#expect(msg.verb == "REQUEST")
		#expect(msg.service == "foo/bar")
		#expect(msg.headers.count == 2)
		#expect(msg.headers["Request-Id"] == .some("5"))
		#expect(
			msg.headers["Content-Type"] == .some("application/json;charset=utf-8")
		)
		#expect(msg.body == .some("{\"foo\":\"bar\"}"))
	}

	@Test func encodeThenDecode() {
		let msg = Moo(
			schemaVersion: 2,
			verb: "OPTIONS",
			service: "foo/bar",
			headers: ["Language": "Esperanto"],
			body: "FOO BAR".data(using: .utf8)!
		)

		let encoded = String(msg)
		guard let decoded = Moo(encoded) else {
			#expect(Bool(false), "Unable to encode")
			return
		}

		#expect(decoded.schemaVersion == 2)
		#expect(decoded.verb == "OPTIONS")
		#expect(decoded.service == "foo/bar")
		#expect(decoded.headers.count == 1)
		#expect(decoded.headers["Language"] == .some("Esperanto"))
		#expect(decoded.body == .some("FOO BAR"))
	}
}