//
//  SwifterTests.swift
//  SwifterTests
//
//  Copyright © 2016 Damian Kołakowski. All rights reserved.
//

import XCTest
@testable import Swifter

class SwifterTestsWebSocketSession: XCTestCase {

    class TestSocket: Socket {
        var content = [UInt8]()
        var offset = 0

        init(_ content: [UInt8]) {
            super.init(socketFileDescriptor: -1)
            self.content.append(contentsOf: content)
        }

        override func read() throws -> UInt8 {
            if offset < content.count {
                let value = self.content[offset]
                offset += 1
                return value
            }
            throw SocketError.recvFailed("")
        }
    }

    // swiftlint:disable function_body_length
    func testParser() {

        do {
            let session = WebSocketSession(TestSocket([0]))
            _ = try session.readFrame()
            XCTAssert(false, "Parser should throw an error if socket has not enough data for a frame.")
        } catch {
            XCTAssert(true, "Parser should throw an error if socket has not enough data for a frame.")
        }

        do {
            let session = WebSocketSession(TestSocket([0b0000_0001, 0b0000_0000, 0, 0, 0, 0]))
            _ = try session.readFrame()
            XCTAssert(false, "Parser should not accept unmasked frames.")
        } catch WebSocketSession.WsError.unMaskedFrame {
            XCTAssert(true, "Parse should throw UnMaskedFrame error for unmasked message.")
        } catch {
            XCTAssert(false, "Parse should throw UnMaskedFrame error for unmasked message.")
        }

        do {
            let session = WebSocketSession(TestSocket([0b1000_0001, 0b1000_0000, 0, 0, 0, 0]))
            let frame = try session.readFrame()
            XCTAssert(frame.fin, "Parser should detect fin flag set.")
        } catch {
            XCTAssert(false, "Parser should not throw an error for a frame with fin flag set (\(error)")
        }

        do {
            let session = WebSocketSession(TestSocket([0b0000_0000, 0b1000_0000, 0, 0, 0, 0]))
            let frame = try session.readFrame()
            XCTAssertEqual(frame.opcode, WebSocketSession.OpCode.continue, "Parser should accept Continue opcode.")
        } catch {
            XCTAssertTrue(true, "Parser should accept Continue opcode without any errors.")
        }

        do {
            let session = WebSocketSession(TestSocket([0b0000_0001, 0b1000_0000, 0, 0, 0, 0]))
            let frame = try session.readFrame()
            XCTAssertEqual(frame.opcode, WebSocketSession.OpCode.text, "Parser should accept Text opcode.")
        } catch {
            XCTAssert(false, "Parser should accept Text opcode without any errors.")
        }

        do {
            let session = WebSocketSession(TestSocket([0b0000_0010, 0b1000_0000, 0, 0, 0, 0]))
            let frame = try session.readFrame()
            XCTAssertEqual(frame.opcode, WebSocketSession.OpCode.binary, "Parser should accept Binary opcode.")
        } catch {
            XCTAssert(false, "Parser should accept Binary opcode without any errors.")
        }

        do {
            let session = WebSocketSession(TestSocket([0b1000_1000, 0b1000_0000, 0, 0, 0, 0]))
            let frame = try session.readFrame()
            XCTAssertEqual(frame.opcode, WebSocketSession.OpCode.close, "Parser should accept Close opcode.")
        } catch let error {
            XCTAssert(false, "Parser should accept Close opcode without any errors. \(error)")
        }

        do {
            let session = WebSocketSession(TestSocket([0b1000_1001, 0b1000_0000, 0, 0, 0, 0]))
            let frame = try session.readFrame()
            XCTAssertEqual(frame.opcode, WebSocketSession.OpCode.ping, "Parser should accept Ping opcode.")
        } catch let error {
            XCTAssert(false, "Parser should accept Ping opcode without any errors. \(error)")
        }

        do {
            let session = WebSocketSession(TestSocket([0b1000_1010, 0b1000_0000, 0, 0, 0, 0]))
            let frame = try session.readFrame()
            XCTAssertEqual(frame.opcode, WebSocketSession.OpCode.pong, "Parser should accept Pong opcode.")
        } catch let error {
            XCTAssert(false, "Parser should accept Pong opcode without any errors. \(error)")
        }

        for opcode in [3, 4, 5, 6, 7, 11, 12, 13, 14, 15] {
            do {
                let session = WebSocketSession(TestSocket([UInt8(opcode), 0b1000_0000, 0, 0, 0, 0]))
                _ = try session.readFrame()
                XCTAssert(false, "Parse should throw an error for unknown opcode: \(opcode)")
            } catch WebSocketSession.WsError.unknownOpCode(_) {
                XCTAssert(true, "Parse should throw UnknownOpCode error for unknown opcode.")
            } catch {
                XCTAssert(false, "Parse should throw UnknownOpCode error for unknown opcode (was \(error)).")
            }
        }
    }
}