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 testNonClearableFieldNeverSendsExplicitEmptyValue() {
        let schema = RouterOSMenuSchema(
            menuPath: "/system routerboard mode-button", restPath: "system/routerboard/mode-button", category: .system,
            displayName: "Test", summary: "", explanation: "",
            fields: [
                RouterOSFieldSchema(key: "enabled", label: "Aktiviert", kind: .bool, help: "", defaultValue: "no"),
                RouterOSFieldSchema(key: "hold-time", label: "Haltedauer", kind: .text, help: "", clearable: false)
            ],
            isSingleton: true
        )
        let viewModel = ExpertViewModel(connectionService: ConnectionService())
        viewModel.selectedSchema = schema
        // A previously non-empty "hold-time" that the user's form now shows blank (whatever the
        // cause) must still never be sent as an explicit clear — only this field's `clearable:
        // false` should suppress it; "enabled" (clearable, unaffected) still sends normally.
        viewModel.startEditing(RouterOSMenuItem(id: "singleton", fields: ["enabled": "no", "hold-time": "3s..5s"]))
        viewModel.formValues["enabled"] = "yes"
        viewModel.formValues["hold-time"] = ""

        XCTAssertNil(viewModel.pendingCommand?.arguments["hold-time"])
        XCTAssertEqual(viewModel.pendingCommand?.arguments["enabled"], "yes")
    }

    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")
    }

    /// Regression tests for the Experte-tab port-conflict check (per explicit request: "die
    /// Abfrage vom Einrichten-Assistenten auf Expert anwenden ... mit allen Warnungen"). No live
    /// connection is set up here, so `checkInterfacePortConflict()`'s actual network call always
    /// fails/is skipped — these only cover the surrounding logic that doesn't need one: schemas
    /// without an `.interfacePick` field are correctly ignored, and the unresolved-conflict gate
    /// starts clear.
    private func makeSchemaWithInterfaceField() -> RouterOSMenuSchema {
        RouterOSMenuSchema(
            menuPath: "/ip address", restPath: "ip/address", category: .ipAddressing,
            displayName: "Test", summary: "", explanation: "",
            fields: [
                RouterOSFieldSchema(key: "address", label: "Adresse", kind: .text, help: ""),
                RouterOSFieldSchema(key: "interface", label: "Interface", kind: .interfacePick, help: "")
            ]
        )
    }

    func testCheckInterfacePortConflictNoOpsForSchemaWithoutInterfaceField() {
        let viewModel = ExpertViewModel(connectionService: ConnectionService())
        viewModel.selectedSchema = makeSchema() // no .interfacePick field
        viewModel.startNewItem()

        viewModel.checkInterfacePortConflict()

        XCTAssertFalse(viewModel.isCheckingInterfacePortConflict)
        XCTAssertNil(viewModel.interfacePortConflict)
        XCTAssertFalse(viewModel.hasUnresolvedInterfacePortConflict)
    }

    func testCheckInterfacePortConflictNoOpsWhenInterfaceFieldIsEmpty() {
        let viewModel = ExpertViewModel(connectionService: ConnectionService())
        viewModel.selectedSchema = makeSchemaWithInterfaceField()
        viewModel.startNewItem() // "interface" has no default, starts empty

        viewModel.checkInterfacePortConflict()

        XCTAssertFalse(viewModel.isCheckingInterfacePortConflict)
        XCTAssertNil(viewModel.interfacePortConflict)
    }

    func testStartingOrCancelingEditResetsAcknowledgedConflictState() {
        let viewModel = ExpertViewModel(connectionService: ConnectionService())
        viewModel.selectedSchema = makeSchemaWithInterfaceField()
        viewModel.startNewItem()
        viewModel.acknowledgeInterfacePortConflict()
        XCTAssertFalse(viewModel.hasUnresolvedInterfacePortConflict, "acknowledging clears the block even with no conflict object set")

        viewModel.cancelEditing()
        viewModel.startNewItem()

        // A fresh edit must not inherit a stale acknowledgement from a previous one.
        XCTAssertNil(viewModel.interfacePortConflict)
    }
}