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

import XCTest
import Swifter

class SwifterTestsWebSocketSession: XCTestCase {
    
    class TestSocket: Socket {
        var content = [UInt8]()
        var offset = 0
        
        init(_ content: [UInt8]) {
            super.init(socketFileDescriptor: -1)
            self.content.appendContentsOf(content)
        }
        
        override func read() throws -> UInt8 {
            if offset < content.count {
                let value = self.content[offset]
                offset = offset + 1
                return value
            }
            throw SocketError.RecvFailed("")
        }
    }
    
    func testParser() {
        let session = HttpHandlers.WebSocketSession(TestSocket([]))
        
        do {
            try session.readFrame(TestSocket([0]))
            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 {
            try session.readFrame(TestSocket([0b0000_0001, 0b0000_0000, 0, 0, 0, 0]))
            XCTAssert(false, "Parser should not accept unmasked frames.")
        } catch HttpHandlers.WebSocketSession.Error.UnMaskedFrame {
            XCTAssert(true, "Parse should throw UnMaskedFrame error for unmasked message.")
        } catch {
            XCTAssert(false, "Parse should throw UnMaskedFrame error for unmasked message.")
        }
        
        do {
            let frame = try session.readFrame(TestSocket([0b1000_0001, 0b1000_0000, 0, 0, 0, 0]))
            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 frame = try session.readFrame(TestSocket([0b0000_0000, 0b1000_0000, 0, 0, 0, 0]))
            XCTAssertEqual(frame.opcode, HttpHandlers.WebSocketSession.OpCode.Continue, "Parser should accept Continue opcode.")
        } catch {
            XCTAssertTrue(true, "Parser should accept Continue opcode without any errors.")
        }
        
        do {
            let frame = try session.readFrame(TestSocket([0b0000_0001, 0b1000_0000, 0, 0, 0, 0]))
            XCTAssertEqual(frame.opcode, HttpHandlers.WebSocketSession.OpCode.Text, "Parser should accept Text opcode.")
        } catch {
            XCTAssert(false, "Parser should accept Text opcode without any errors.")
        }
        
        do {
            let frame = try session.readFrame(TestSocket([0b0000_0010, 0b1000_0000, 0, 0, 0, 0]))
            XCTAssertEqual(frame.opcode, HttpHandlers.WebSocketSession.OpCode.Binary, "Parser should accept Binary opcode.")
        } catch {
            XCTAssert(false, "Parser should accept Binary opcode without any errors.")
        }
        
        do {
            let frame = try session.readFrame(TestSocket([0b0000_1000, 0b1000_0000, 0, 0, 0, 0]))
            XCTAssertEqual(frame.opcode, HttpHandlers.WebSocketSession.OpCode.Close, "Parser should accept Close opcode.")
        } catch {
            XCTAssert(false, "Parser should accept Close opcode without any errors.")
        }
        
        do {
            let frame = try session.readFrame(TestSocket([0b0000_1001, 0b1000_0000, 0, 0, 0, 0]))
            XCTAssertEqual(frame.opcode, HttpHandlers.WebSocketSession.OpCode.Ping, "Parser should accept Ping opcode.")
        } catch {
            XCTAssert(false, "Parser should accept Ping opcode without any errors.")
        }
        
        do {
            let frame = try session.readFrame(TestSocket([0b0000_1010, 0b1000_0000, 0, 0, 0, 0]))
            XCTAssertEqual(frame.opcode, HttpHandlers.WebSocketSession.OpCode.Pong, "Parser should accept Pong opcode.")
        } catch {
            XCTAssert(false, "Parser should accept Pong opcode without any errors.")
        }
        
        for opcode in [3, 4, 5, 6, 7, 11, 12, 13, 14, 15] {
            do {
                try session.readFrame(TestSocket([UInt8(opcode), 0b1000_0000, 0, 0, 0, 0]))
                XCTAssert(false, "Parse should throw an error for unknown opcode: \(opcode)")
            } catch HttpHandlers.WebSocketSession.Error.UnknownOpCode(_) {
                XCTAssert(true, "Parse should throw UnknownOpCode error for unknown opcode.")
            } catch {
                XCTAssert(false, "Parse should throw UnknownOpCode error for unknown opcode (was \(error)).")
            }
        }
    }
}