import XCTest
@testable import CxIDE

// MARK: - EditorViewModel Tests

@MainActor
final class EditorViewModelTests: XCTestCase {

    func testInitialState() {
        let vm = EditorViewModel()
        XCTAssertFalse(vm.content.isEmpty)
        XCTAssertEqual(vm.fontSize, 13)
        XCTAssertTrue(vm.showSidebar)
        XCTAssertFalse(vm.isRunning)
        XCTAssertEqual(vm.bottomPanel, .console)
        XCTAssertEqual(vm.activePanel, .explorer)
        XCTAssertFalse(vm.showCommandPalette)
    }

    func testTabManagement() {
        let vm = EditorViewModel()
        let initialCount = vm.tabs.count
        XCTAssertGreaterThanOrEqual(initialCount, 1)

        // Open a new tab
        let tab = EditorTab(name: "test.swift", content: "let x = 1")
        vm.tabs.append(tab)
        vm.activeTabID = tab.id
        XCTAssertEqual(vm.tabs.count, initialCount + 1)

        // Close tab
        vm.closeTab(tab)
        XCTAssertEqual(vm.tabs.count, initialCount)
    }

    func testCloseAllTabs() {
        let vm = EditorViewModel()
        vm.tabs.append(EditorTab(name: "a.swift", content: "a"))
        vm.tabs.append(EditorTab(name: "b.swift", content: "b"))
        vm.closeAllTabs()
        XCTAssertEqual(vm.tabs.count, 1, "Should have one default tab after closing all")
    }

    func testPerformSearch() {
        let vm = EditorViewModel()
        vm.content = "Hello world! Hello Swift!"
        vm.searchState.query = "Hello"
        vm.performSearch()
        XCTAssertEqual(vm.searchState.matchCount, 2)

        vm.searchState.query = "hello"
        vm.searchState.isCaseSensitive = true
        vm.performSearch()
        XCTAssertEqual(vm.searchState.matchCount, 0)

        vm.searchState.isCaseSensitive = false
        vm.performSearch()
        XCTAssertEqual(vm.searchState.matchCount, 2)
    }

    func testPerformSearchEmpty() {
        let vm = EditorViewModel()
        vm.searchState.query = ""
        vm.performSearch()
        XCTAssertEqual(vm.searchState.matchCount, 0)
    }

    func testReplaceNext() {
        let vm = EditorViewModel()
        vm.content = "foo bar foo"
        vm.searchState.query = "foo"
        vm.searchState.replacement = "baz"
        vm.performSearch()
        XCTAssertEqual(vm.searchState.matchCount, 2)

        vm.replaceNext()
        XCTAssertEqual(vm.content, "baz bar foo")
        XCTAssertEqual(vm.searchState.matchCount, 1)
    }

    func testReplaceAll() {
        let vm = EditorViewModel()
        vm.content = "foo bar foo baz foo"
        vm.searchState.query = "foo"
        vm.searchState.replacement = "qux"
        vm.performSearch()
        vm.replaceAll()
        XCTAssertEqual(vm.content, "qux bar qux baz qux")
        XCTAssertEqual(vm.searchState.matchCount, 0)
    }

    func testClearConsole() {
        let vm = EditorViewModel()
        XCTAssertFalse(vm.consoleEntries.isEmpty)
        vm.clearConsole()
        // clearConsole adds a "Console cleared." system message
        XCTAssertEqual(vm.consoleEntries.count, 1)
        XCTAssertEqual(vm.consoleEntries.first?.level, .system)
    }

    func testToggleSearch() {
        let vm = EditorViewModel()
        XCTAssertFalse(vm.searchState.isActive)
        vm.toggleSearch()
        XCTAssertTrue(vm.searchState.isActive)
        vm.toggleSearch()
        XCTAssertFalse(vm.searchState.isActive)
    }

    func testBottomPanelEnum() {
        let panels = EditorViewModel.BottomPanel.allCases
        XCTAssertEqual(panels.count, 6)
        for panel in panels {
            XCTAssertFalse(panel.rawValue.isEmpty)
            XCTAssertFalse(panel.iconName.isEmpty)
        }
    }

    func testCppAnalysis() {
        let vm = EditorViewModel()
        vm.content = "import Foundation\nfunc hello() {\n    print(\"Hello\")\n}\n"
        vm.runCppAnalysis()
        XCTAssertNotEqual(vm.cppAnalysis, "Ready")
    }

    func testCommandPalette() {
        let vm = EditorViewModel()
        XCTAssertFalse(vm.commands.isEmpty)
        XCTAssertTrue(vm.commands.count > 20)

        let filtered = vm.filteredCommands
        XCTAssertEqual(filtered.count, vm.commands.count)

        vm.commandSearch = "run"
        let runFiltered = vm.filteredCommands
        XCTAssertLessThan(runFiltered.count, vm.commands.count)
    }

    func testBuildConfig() {
        let vm = EditorViewModel()
        XCTAssertEqual(vm.buildConfig.name, "Debug")
        XCTAssertEqual(vm.buildConfig.optimizationLevel, .debug)
    }

    func testTheme() {
        let vm = EditorViewModel()
        XCTAssertEqual(vm.currentTheme.name, "Dark+ (VSCode)")
        XCTAssertNotNil(vm.currentTheme.editorBackground)
        XCTAssertNotNil(vm.currentTheme.sidebarBackground)
    }

    func testNotifications() {
        let vm = EditorViewModel()
        let initialCount = vm.notifications.count
        vm.notify(.info("Test"))
        XCTAssertEqual(vm.notifications.count, initialCount + 1)
        XCTAssertEqual(vm.notifications.last?.message, "Test")
    }
}

// MARK: - Engine Tests

final class EngineTests: XCTestCase {

    func testCppEngineMetrics() {
        let engine = CppEngineController()
        let code = "import Foundation\n\nfunc hello() {\n    print(\"Hello\")\n}\n\nfunc goodbye() {\n    print(\"Bye\")\n}\n"
        XCTAssertGreaterThan(engine.lineCount(code), 0)
        XCTAssertGreaterThan(engine.codeLineCount(code), 0)
        XCTAssertGreaterThanOrEqual(engine.functionCount(code), 1)
        XCTAssertEqual(engine.classCount(code), 0)
    }

    func testCppEngineChecksum() {
        let engine = CppEngineController()
        let code = "let x = 1"
        let checksum1 = engine.checksum(code)
        let checksum2 = engine.checksum(code)
        XCTAssertEqual(checksum1, checksum2, "Same input should produce same checksum")

        let checksum3 = engine.checksum("let x = 2")
        XCTAssertNotEqual(checksum1, checksum3, "Different input should produce different checksum")
    }

    func testCppEngineStructuredAnalysis() {
        let engine = CppEngineController()
        let code = "struct MyStruct {\n    var value: Int\n}\n"
        let result = engine.runStructuredAnalysis(code)
        XCTAssertFalse(result.isEmpty)
    }

    func testCppEngineConfig() {
        let engine = CppEngineController()
        var config = CppAnalysisConfig()
        config.maxLineLength = 80
        config.detectForceUnwraps = false
        engine.applyConfig(config)
        // Should not crash
        let result = engine.runAnalysis("let x = 1")
        XCTAssertFalse(result.isEmpty)
    }

    func testCppEngineBlankLines() {
        let engine = CppEngineController()
        let code = "line1\n\nline3\n\n\nline6\n"
        let blanks = engine.blankLineCount(code)
        XCTAssertGreaterThanOrEqual(blanks, 3)
    }

    func testSwiftRuntimeEngine() async throws {
        let tmpDir = FileManager.default.temporaryDirectory.appendingPathComponent("CxIDETest-\(UUID().uuidString)")
        try FileManager.default.createDirectory(at: tmpDir, withIntermediateDirectories: true)
        defer { try? FileManager.default.removeItem(at: tmpDir) }

        let engine = SwiftRuntimeEngine(projectDirectory: tmpDir)
        let result = try await engine.execute(script: "print(42)")
        XCTAssertTrue(result.contains("42"))
    }

    func testEngineFactory() {
        let engine = EngineFactory.make(.sandbox)
        XCTAssertNotNil(engine)

        let fullEngine = EngineFactory.make(.swift)
        XCTAssertNotNil(fullEngine)
    }
}

// MARK: - Service Tests

@MainActor
final class ServiceTests: XCTestCase {

    func testGitServiceInit() {
        let service = GitService()
        XCTAssertEqual(service.status.branch, "main")
        XCTAssertTrue(service.status.isClean)
        XCTAssertFalse(service.isGitRepo)
    }

    func testWorkspaceServiceInit() {
        let service = WorkspaceService()
        XCTAssertNil(service.currentWorkspace)
        XCTAssertTrue(service.fileTree.isEmpty)
        XCTAssertFalse(service.isLoading)
    }

    func testAgentServiceInit() {
        let service = AgentService()
        XCTAssertTrue(service.messages.isEmpty)
        XCTAssertEqual(service.status, .idle)
        XCTAssertFalse(service.isInitialized)
    }

    func testAgentServiceToolCount() {
        let service = AgentService()
        XCTAssertGreaterThanOrEqual(service.toolCount, 0)
    }
}