import XCTest
@testable import RouterOSAssistant

@MainActor
final class ExpertViewModelTests: XCTestCase {
    private func makeSchema() -> RouterOSMenuSchema {
        RouterOSMenuSchema(
            menuPath: "/ip route", restPath: "ip/route", category: .routing,
            displayName: "Test", summary: "", explanation: "",
            fields: [
                RouterOSFieldSchema(key: "comment", label: "Kommentar", kind: .text, help: ""),
                RouterOSFieldSchema(key: "distance", label: "Distanz", kind: .int, help: "")
            ]
        )
    }

    func testClearingACuratedFieldSendsExplicitEmptyValue() {
        let viewModel = ExpertViewModel(connectionService: ConnectionService())
        viewModel.selectedSchema = makeSchema()
        viewModel.startEditing(RouterOSMenuItem(id: "*1", fields: ["comment": "bridge"]))
        viewModel.formValues["comment"] = ""

        XCTAssertEqual(viewModel.pendingCommand?.arguments["comment"], "")
    }

    func testUnchangedUncuratedFieldIsNotResent() {
        let viewModel = ExpertViewModel(connectionService: ConnectionService())
        viewModel.selectedSchema = makeSchema()
        viewModel.startEditing(RouterOSMenuItem(id: "*1", fields: ["comment": "", "immediate-gw": "192.168.88.1"]))
        viewModel.formValues["comment"] = "bridge"

        XCTAssertNil(viewModel.pendingCommand?.arguments["immediate-gw"])
        XCTAssertEqual(viewModel.pendingCommand?.arguments["comment"], "bridge")
    }

    func testChangedUncuratedFieldIsSent() {
        let viewModel = ExpertViewModel(connectionService: ConnectionService())
        viewModel.selectedSchema = makeSchema()
        viewModel.startEditing(RouterOSMenuItem(id: "*1", fields: ["comment": "", "note": "old"]))
        viewModel.extraFields = [.init(key: "note", value: "new")]

        XCTAssertEqual(viewModel.pendingCommand?.arguments["note"], "new")
    }

    /// A dynamic/connected route's distance=0 is only valid as-is — RouterOS rejects it if
    /// resent verbatim on a `set` ("value of distance out of range (1...255)"), even when the
    /// value itself hasn't changed. Editing only the comment must not resend it.
    func testUnchangedCuratedFieldIsNotResentEvenIfOutOfNormalRange() {
        let viewModel = ExpertViewModel(connectionService: ConnectionService())
        viewModel.selectedSchema = makeSchema()
        viewModel.startEditing(RouterOSMenuItem(id: "*1", fields: ["comment": "", "distance": "0"]))
        viewModel.formValues["comment"] = "bridge"

        XCTAssertNil(viewModel.pendingCommand?.arguments["distance"])
        XCTAssertEqual(viewModel.pendingCommand?.arguments["comment"], "bridge")
    }
}