// retoor <retoor@molodetz.nl>

import Foundation

enum IpcCommand: String, Codable {
    case addCheck
    case removeCheck
    case updateCheck
    case listChecks
    case getMetrics
    case ping
    case shutdown
}

struct IpcRequest: Codable {
    let reqId: Int
    let command: IpcCommand
    let payload: [String: String]?
}

struct CheckTarget: Codable {
    let uid: String
    let type: String
    let target: String
    let intervalSeconds: Int
    let port: Int?
    let protocolType: String?
}

struct IpcResponse: Codable {
    let reqId: Int
    let kind: String
    let payload: String?
    let checks: [CheckTarget]?
    let metrics: [MetricSample]?
    let error: String?
}

struct MetricSample: Codable {
    let checkUid: String
    let timestamp: Double
    let latencyMs: Double
    let status: String
    let statusCode: Int
    let errorMessage: String?
}

enum IpcProtocol {
    static func readRequest(from line: String) -> IpcRequest? {
        guard let data = line.data(using: .utf8) else { return nil }
        return try? JSONDecoder().decode(IpcRequest.self, from: data)
    }

    static func writeResponse(_ response: IpcResponse) -> String? {
        let encoder = JSONEncoder()
        guard let data = try? encoder.encode(response) else { return nil }
        return String(data: data, encoding: .utf8)
    }
}