import Foundation
import Testing

// This file contains standalone tests that don't require importing VibeTunnel module
// They test the concepts and logic without depending on the actual app code

@Suite("Standalone API Tests", .tags(.critical, .networking))
struct StandaloneAPITests {
    @Test("URL construction for API endpoints")
    func uRLConstruction() {
        let baseURL = URL(string: "http://localhost:8888")!

        // Test session endpoints
        let sessionsURL = baseURL.appendingPathComponent("api/sessions")
        #expect(sessionsURL.absoluteString == "http://localhost:8888/api/sessions")

        let sessionURL = baseURL.appendingPathComponent("api/sessions/test-123")
        #expect(sessionURL.absoluteString == "http://localhost:8888/api/sessions/test-123")

        let inputURL = baseURL.appendingPathComponent("api/sessions/test-123/input")
        #expect(inputURL.absoluteString == "http://localhost:8888/api/sessions/test-123/input")
    }

    @Test("JSON encoding for session creation")
    func sessionCreateEncoding() throws {
        struct SessionCreateData: Codable {
            let command: [String]
            let workingDir: String
            let name: String?
            let cols: Int?
            let rows: Int?
        }

        let data = SessionCreateData(
            command: ["/bin/bash"],
            workingDir: "/Users/test",
            name: "Test Session",
            cols: 80,
            rows: 24
        )

        let encoder = JSONEncoder()
        let jsonData = try encoder.encode(data)
        let json = try JSONSerialization.jsonObject(with: jsonData) as? [String: Any]

        #expect(json?["command"] as? [String] == ["/bin/bash"])
        #expect(json?["workingDir"] as? String == "/Users/test")
        #expect(json?["name"] as? String == "Test Session")
        #expect(json?["cols"] as? Int == 80)
        #expect(json?["rows"] as? Int == 24)
    }

    @Test("Error response parsing")
    func errorResponseParsing() throws {
        struct ErrorResponse: Codable {
            let error: String?
            let code: Int?
        }

        let errorJSON = """
        {
            "error": "Session not found",
            "code": 404
        }
        """

        let data = errorJSON.data(using: .utf8)!
        let decoder = JSONDecoder()
        let errorResponse = try decoder.decode(ErrorResponse.self, from: data)

        #expect(errorResponse.error == "Session not found")
        #expect(errorResponse.code == 404)
    }
}

@Suite("WebSocket Binary Protocol Tests", .tags(.websocket))
struct WebSocketProtocolTests {
    @Test("Binary message magic byte validation")
    func magicByteValidation() {
        let validData = Data([0xBF, 0x00, 0x00, 0x00, 0x00])
        let invalidData = Data([0xAB, 0x00, 0x00, 0x00, 0x00])

        #expect(validData.first == 0xBF)
        #expect(invalidData.first != 0xBF)
    }

    @Test("Binary buffer header parsing")
    func bufferHeaderParsing() {
        var data = Data()

        // Magic byte
        data.append(0xBF)

        // Header (5 Int32 values in little endian)
        let cols: Int32 = 80
        let rows: Int32 = 24
        let viewportY: Int32 = 0
        let cursorX: Int32 = 10
        let cursorY: Int32 = 5

        data.append(contentsOf: withUnsafeBytes(of: cols.littleEndian) { Array($0) })
        data.append(contentsOf: withUnsafeBytes(of: rows.littleEndian) { Array($0) })
        data.append(contentsOf: withUnsafeBytes(of: viewportY.littleEndian) { Array($0) })
        data.append(contentsOf: withUnsafeBytes(of: cursorX.littleEndian) { Array($0) })
        data.append(contentsOf: withUnsafeBytes(of: cursorY.littleEndian) { Array($0) })

        // Verify parsing - use safe byte extraction instead of direct load
        var offset = 1 // Skip magic byte

        let parsedCols = data.subdata(in: offset..<offset + 4).withUnsafeBytes { bytes in
            Int32(littleEndian: bytes.bindMemory(to: Int32.self).baseAddress!.pointee)
        }
        offset += 4

        let parsedRows = data.subdata(in: offset..<offset + 4).withUnsafeBytes { bytes in
            Int32(littleEndian: bytes.bindMemory(to: Int32.self).baseAddress!.pointee)
        }

        #expect(parsedCols == 80)
        #expect(parsedRows == 24)
    }
}

@Suite("Model Validation Tests", .tags(.models))
struct ModelValidationTests {
    @Test("Session status enum values")
    func sessionStatusValues() {
        enum SessionStatus: String {
            case starting
            case running
            case exited
        }

        #expect(SessionStatus.starting.rawValue == "starting")
        #expect(SessionStatus.running.rawValue == "running")
        #expect(SessionStatus.exited.rawValue == "exited")
    }

    @Test("Server config URL generation")
    func serverConfigURLs() {
        struct ServerConfig {
            let host: String
            let port: Int
            let useSSL: Bool

            var baseURL: URL {
                let scheme = useSSL ? "https" : "http"
                return URL(string: "\(scheme)://\(host):\(port)")!
            }

            var websocketURL: URL {
                let scheme = useSSL ? "wss" : "ws"
                return URL(string: "\(scheme)://\(host):\(port)")!
            }
        }

        let httpConfig = ServerConfig(host: "localhost", port: 8_888, useSSL: false)
        #expect(httpConfig.baseURL.absoluteString == "http://localhost:8888")
        #expect(httpConfig.websocketURL.absoluteString == "ws://localhost:8888")

        let httpsConfig = ServerConfig(host: "example.com", port: 443, useSSL: true)
        #expect(httpsConfig.baseURL.absoluteString == "https://example.com:443")
        #expect(httpsConfig.websocketURL.absoluteString == "wss://example.com:443")
    }
}

@Suite("Persistence Tests", .tags(.persistence))
struct PersistenceTests {
    @Test("UserDefaults encoding and decoding")
    func userDefaultsPersistence() throws {
        struct TestConfig: Codable, Equatable {
            let host: String
            let port: Int
        }

        let config = TestConfig(host: "test.local", port: 9_999)
        let key = "test_config_\(UUID().uuidString)"

        // Save
        let encoder = JSONEncoder()
        let data = try encoder.encode(config)
        UserDefaults.standard.set(data, forKey: key)

        // Load
        guard let loadedData = UserDefaults.standard.data(forKey: key) else {
            Issue.record("Failed to load data from UserDefaults")
            return
        }

        let decoder = JSONDecoder()
        let loadedConfig = try decoder.decode(TestConfig.self, from: loadedData)

        #expect(loadedConfig == config)

        // Cleanup
        UserDefaults.standard.removeObject(forKey: key)
    }

    @Test("Connection state restoration logic")
    func connectionStateLogic() {
        let now = Date()
        let thirtyMinutesAgo = now.addingTimeInterval(-1_800) // 30 minutes
        let twoHoursAgo = now.addingTimeInterval(-7_200) // 2 hours

        // Within time window (less than 1 hour)
        let timeSinceLastConnection1 = now.timeIntervalSince(thirtyMinutesAgo)
        #expect(timeSinceLastConnection1 < 3_600)
        #expect(timeSinceLastConnection1 > 0)

        // Outside time window (more than 1 hour)
        let timeSinceLastConnection2 = now.timeIntervalSince(twoHoursAgo)
        #expect(timeSinceLastConnection2 >= 3_600)
    }
}

@Suite("Date Formatting Tests")
struct DateFormattingTests {
    @Test("ISO8601 date parsing")
    func iSO8601Parsing() {
        let formatter = ISO8601DateFormatter()
        let dateString = "2024-01-01T10:00:00Z"

        let date = formatter.date(from: dateString)
        #expect(date != nil)

        // Round trip
        if let date {
            let formattedString = formatter.string(from: date)
            #expect(formattedString == dateString)
        }
    }

    @Test("RFC3339 date formats")
    func rFC3339Formats() throws {
        let formatter = DateFormatter()
        formatter.locale = Locale(identifier: "en_US_POSIX")

        // With fractional seconds
        formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSSSSXXXXX"
        let date1 = formatter.date(from: "2024-01-01T10:00:00.123456Z")
        #expect(date1 != nil)

        // Without fractional seconds
        formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssXXXXX"
        let date2 = formatter.date(from: "2024-01-01T10:00:00Z")
        #expect(date2 != nil)
    }
}
