//
//  NavigationUITests.swift
//  PlantGuideUITests
//
//  Created on 2026-01-21.
//
//  UI tests for app navigation including tab bar navigation
//  and deep navigation flows between views.
//

import XCTest

final class NavigationUITests: XCTestCase {

    // MARK: - Properties

    var app: XCUIApplication!

    // MARK: - Setup & Teardown

    override func setUpWithError() throws {
        continueAfterFailure = false
        app = XCUIApplication()
    }

    override func tearDownWithError() throws {
        app = nil
    }

    // MARK: - Tab Bar Accessibility Tests

    /// Tests that all tabs are accessible in the tab bar.
    @MainActor
    func testAllTabsAreAccessible() throws {
        // Given: App launched
        app.launchWithMockData()

        // Then: All four tabs should be present and accessible
        let tabBar = app.tabBars.firstMatch
        XCTAssertTrue(tabBar.waitForExistence(timeout: 5), "Tab bar should exist")

        // Verify Camera tab
        let cameraTab = tabBar.buttons[AccessibilityID.TabBar.camera]
        XCTAssertTrue(cameraTab.exists, "Camera tab should be accessible")

        // Verify Collection tab
        let collectionTab = tabBar.buttons[AccessibilityID.TabBar.collection]
        XCTAssertTrue(collectionTab.exists, "Collection tab should be accessible")

        // Verify Care tab
        let careTab = tabBar.buttons[AccessibilityID.TabBar.care]
        XCTAssertTrue(careTab.exists, "Care tab should be accessible")

        // Verify Settings tab
        let settingsTab = tabBar.buttons[AccessibilityID.TabBar.settings]
        XCTAssertTrue(settingsTab.exists, "Settings tab should be accessible")
    }

    /// Tests that tab buttons have correct labels for accessibility.
    @MainActor
    func testTabButtonLabels() throws {
        // Given: App launched
        app.launchWithMockData()

        let tabBar = app.tabBars.firstMatch
        XCTAssertTrue(tabBar.waitForExistence(timeout: 5), "Tab bar should exist")

        // Then: Verify each tab has the correct label
        let expectedTabs = ["Camera", "Collection", "Care", "Settings"]

        for tabName in expectedTabs {
            let tab = tabBar.buttons[tabName]
            XCTAssertTrue(tab.exists, "\(tabName) tab should have correct label")
        }
    }

    // MARK: - Tab Navigation Tests

    /// Tests navigation to Camera tab.
    @MainActor
    func testNavigateToCameraTab() throws {
        // Given: App launched
        app.launchWithMockData()

        // Start from Collection tab
        app.navigateToTab(AccessibilityID.TabBar.collection)

        // When: Navigate to Camera tab
        app.navigateToTab(AccessibilityID.TabBar.camera)

        // Then: Camera tab should be selected
        let cameraTab = app.tabBars.buttons[AccessibilityID.TabBar.camera]
        XCTAssertTrue(cameraTab.isSelected, "Camera tab should be selected")

        // Camera view content should be visible
        // Either permission view or camera controls
        let permissionText = app.staticTexts["Camera Access Required"]
        let captureButton = app.buttons["Capture photo"]
        let deniedText = app.staticTexts["Camera Access Denied"]

        let cameraContentVisible = permissionText.waitForExistence(timeout: 3) ||
                                    captureButton.waitForExistence(timeout: 2) ||
                                    deniedText.waitForExistence(timeout: 2)

        XCTAssertTrue(cameraContentVisible, "Camera view content should be visible")
    }

    /// Tests navigation to Collection tab.
    @MainActor
    func testNavigateToCollectionTab() throws {
        // Given: App launched
        app.launchWithMockData()

        // When: Navigate to Collection tab
        app.navigateToTab(AccessibilityID.TabBar.collection)

        // Then: Collection tab should be selected
        let collectionTab = app.tabBars.buttons[AccessibilityID.TabBar.collection]
        XCTAssertTrue(collectionTab.isSelected, "Collection tab should be selected")

        // Collection navigation title should appear
        let collectionTitle = app.navigationBars["My Plants"]
        XCTAssertTrue(
            collectionTitle.waitForExistence(timeout: 5),
            "Collection navigation title should appear"
        )
    }

    /// Tests navigation to Care tab.
    @MainActor
    func testNavigateToCareTab() throws {
        // Given: App launched
        app.launchWithMockData()

        // When: Navigate to Care tab
        app.navigateToTab(AccessibilityID.TabBar.care)

        // Then: Care tab should be selected
        let careTab = app.tabBars.buttons[AccessibilityID.TabBar.care]
        XCTAssertTrue(careTab.isSelected, "Care tab should be selected")

        // Care Schedule navigation title should appear
        let careTitle = app.navigationBars["Care Schedule"]
        XCTAssertTrue(
            careTitle.waitForExistence(timeout: 5),
            "Care Schedule navigation title should appear"
        )
    }

    /// Tests navigation to Settings tab.
    @MainActor
    func testNavigateToSettingsTab() throws {
        // Given: App launched
        app.launchWithMockData()

        // When: Navigate to Settings tab
        app.navigateToTab(AccessibilityID.TabBar.settings)

        // Then: Settings tab should be selected
        let settingsTab = app.tabBars.buttons[AccessibilityID.TabBar.settings]
        XCTAssertTrue(settingsTab.isSelected, "Settings tab should be selected")

        // Settings navigation title should appear
        let settingsTitle = app.navigationBars["Settings"]
        XCTAssertTrue(
            settingsTitle.waitForExistence(timeout: 5),
            "Settings navigation title should appear"
        )
    }

    // MARK: - Tab Navigation Round Trip Tests

    /// Tests navigating between all tabs in sequence.
    @MainActor
    func testNavigatingBetweenAllTabs() throws {
        // Given: App launched
        app.launchWithMockData()

        let tabNames = [
            AccessibilityID.TabBar.collection,
            AccessibilityID.TabBar.care,
            AccessibilityID.TabBar.settings,
            AccessibilityID.TabBar.camera
        ]

        // When: Navigate through all tabs
        for tabName in tabNames {
            app.navigateToTab(tabName)

            // Then: Tab should be selected
            let tab = app.tabBars.buttons[tabName]
            XCTAssertTrue(
                tab.isSelected,
                "\(tabName) tab should be selected after navigation"
            )
        }
    }

    /// Tests rapid tab switching doesn't cause crashes.
    @MainActor
    func testRapidTabSwitching() throws {
        // Given: App launched
        app.launchWithMockData()

        let tabNames = [
            AccessibilityID.TabBar.camera,
            AccessibilityID.TabBar.collection,
            AccessibilityID.TabBar.care,
            AccessibilityID.TabBar.settings
        ]

        // When: Rapidly switch between tabs multiple times
        for _ in 0..<3 {
            for tabName in tabNames {
                let tab = app.tabBars.buttons[tabName]
                if tab.exists {
                    tab.tap()
                }
            }
        }

        // Then: App should still be functional
        let tabBar = app.tabBars.firstMatch
        XCTAssertTrue(tabBar.exists, "Tab bar should still exist after rapid switching")
    }

    // MARK: - Deep Navigation Tests

    /// Tests deep navigation: Collection -> Plant Detail.
    @MainActor
    func testCollectionToPlantDetailNavigation() throws {
        // Given: App launched with mock data
        app.launchWithMockData()
        app.navigateToTab(AccessibilityID.TabBar.collection)

        // Wait for collection to load
        let collectionTitle = app.navigationBars["My Plants"]
        XCTAssertTrue(collectionTitle.waitForExistence(timeout: 5), "Collection should load")

        // When: Tap on a plant cell
        // First check if there are plants (in grid view, they're in scroll view)
        let scrollView = app.scrollViews.firstMatch

        if scrollView.waitForExistence(timeout: 3) {
            // Find any tappable plant element
            let plantCell = scrollView.buttons.firstMatch.exists ?
                            scrollView.buttons.firstMatch :
                            scrollView.otherElements.firstMatch

            if plantCell.waitForExistence(timeout: 3) {
                plantCell.tap()

                // Then: Plant detail view should appear
                let detailTitle = app.navigationBars["Plant Details"]
                let backButton = app.navigationBars.buttons["My Plants"]

                let detailAppeared = detailTitle.waitForExistence(timeout: 5) ||
                                      backButton.waitForExistence(timeout: 3)

                XCTAssertTrue(
                    detailAppeared,
                    "Plant detail view should appear after tapping plant"
                )
            }
        }
    }

    /// Tests deep navigation: Collection -> Plant Detail -> Back.
    @MainActor
    func testCollectionDetailAndBackNavigation() throws {
        // Given: App launched with mock data and navigated to detail
        app.launchWithMockData()
        app.navigateToTab(AccessibilityID.TabBar.collection)

        let collectionTitle = app.navigationBars["My Plants"]
        XCTAssertTrue(collectionTitle.waitForExistence(timeout: 5), "Collection should load")

        let scrollView = app.scrollViews.firstMatch

        if scrollView.waitForExistence(timeout: 3) {
            let plantCell = scrollView.buttons.firstMatch.exists ?
                            scrollView.buttons.firstMatch :
                            scrollView.otherElements.firstMatch

            if plantCell.waitForExistence(timeout: 3) {
                plantCell.tap()

                // Wait for detail to appear
                let backButton = app.navigationBars.buttons["My Plants"]

                if backButton.waitForExistence(timeout: 5) {
                    // When: Tap back button
                    backButton.tap()

                    // Then: Should return to collection
                    XCTAssertTrue(
                        collectionTitle.waitForExistence(timeout: 5),
                        "Should return to collection after back navigation"
                    )
                }
            }
        }
    }

    /// Tests deep navigation: Collection -> Plant Detail -> Care Schedule section.
    @MainActor
    func testCollectionToPlantDetailToCareSchedule() throws {
        // Given: App launched with mock data
        app.launchWithMockData()
        app.navigateToTab(AccessibilityID.TabBar.collection)

        let collectionTitle = app.navigationBars["My Plants"]
        XCTAssertTrue(collectionTitle.waitForExistence(timeout: 5), "Collection should load")

        let scrollView = app.scrollViews.firstMatch

        if scrollView.waitForExistence(timeout: 3) {
            let plantCell = scrollView.buttons.firstMatch.exists ?
                            scrollView.buttons.firstMatch :
                            scrollView.otherElements.firstMatch

            if plantCell.waitForExistence(timeout: 3) {
                plantCell.tap()

                // Wait for detail to load
                let detailLoaded = app.navigationBars.buttons["My Plants"].waitForExistence(timeout: 5)

                if detailLoaded {
                    // When: Look for care information in detail view
                    // The PlantDetailView shows care info section if available
                    let careSection = app.staticTexts.matching(
                        NSPredicate(format: "label CONTAINS[c] 'care' OR label CONTAINS[c] 'watering'")
                    ).firstMatch

                    let upcomingTasks = app.staticTexts["Upcoming Tasks"]

                    // Then: Care-related content should be visible or loadable
                    let careContentVisible = careSection.waitForExistence(timeout: 3) ||
                                              upcomingTasks.waitForExistence(timeout: 2)

                    // If no care data, loading state or error should show
                    let loadingText = app.staticTexts["Loading care information..."]
                    let errorView = app.staticTexts["Unable to Load Care Info"]

                    XCTAssertTrue(
                        careContentVisible || loadingText.exists || errorView.exists || detailLoaded,
                        "Plant detail should show care content or loading state"
                    )
                }
            }
        }
    }

    // MARK: - Navigation State Preservation Tests

    /// Tests that tab state is preserved when switching tabs.
    @MainActor
    func testTabStatePreservation() throws {
        // Given: App launched with mock data
        app.launchWithMockData()
        app.navigateToTab(AccessibilityID.TabBar.collection)

        // Perform search to establish state
        let searchField = app.searchFields.firstMatch
        if searchField.waitForExistence(timeout: 5) {
            searchField.tap()
            searchField.typeText("Test")
        }

        // When: Switch to another tab and back
        app.navigateToTab(AccessibilityID.TabBar.settings)
        app.navigateToTab(AccessibilityID.TabBar.collection)

        // Then: Collection view should be restored
        let collectionTitle = app.navigationBars["My Plants"]
        XCTAssertTrue(
            collectionTitle.waitForExistence(timeout: 5),
            "Collection should be restored after tab switch"
        )
    }

    /// Tests navigation with navigation stack (push/pop).
    @MainActor
    func testNavigationStackPushPop() throws {
        // Given: App launched with mock data
        app.launchWithMockData()
        app.navigateToTab(AccessibilityID.TabBar.collection)

        // Record initial navigation bar count
        let initialNavBarCount = app.navigationBars.count

        let scrollView = app.scrollViews.firstMatch

        if scrollView.waitForExistence(timeout: 3) {
            let plantCell = scrollView.buttons.firstMatch.exists ?
                            scrollView.buttons.firstMatch :
                            scrollView.otherElements.firstMatch

            if plantCell.waitForExistence(timeout: 3) {
                // When: Push to detail view
                plantCell.tap()

                let backButton = app.navigationBars.buttons["My Plants"]
                if backButton.waitForExistence(timeout: 5) {
                    // Then: Pop back
                    backButton.tap()

                    // Navigation should return to initial state
                    let collectionTitle = app.navigationBars["My Plants"]
                    XCTAssertTrue(
                        collectionTitle.waitForExistence(timeout: 5),
                        "Should pop back to collection"
                    )
                }
            }
        }
    }

    // MARK: - Edge Case Tests

    /// Tests that tapping already selected tab doesn't cause issues.
    @MainActor
    func testTappingAlreadySelectedTab() throws {
        // Given: App launched
        app.launchWithMockData()
        app.navigateToTab(AccessibilityID.TabBar.collection)

        let collectionTitle = app.navigationBars["My Plants"]
        XCTAssertTrue(collectionTitle.waitForExistence(timeout: 5), "Collection should load")

        // When: Tap the already selected tab multiple times
        let collectionTab = app.tabBars.buttons[AccessibilityID.TabBar.collection]
        collectionTab.tap()
        collectionTab.tap()
        collectionTab.tap()

        // Then: Should remain functional without crashes
        XCTAssertTrue(collectionTitle.exists, "Collection should remain visible")
        XCTAssertTrue(collectionTab.isSelected, "Collection tab should remain selected")
    }

    /// Tests navigation state after app goes to background and foreground.
    @MainActor
    func testNavigationAfterBackgroundForeground() throws {
        // Given: App launched and navigated to a specific tab
        app.launchWithMockData()
        app.navigateToTab(AccessibilityID.TabBar.settings)

        let settingsTitle = app.navigationBars["Settings"]
        XCTAssertTrue(settingsTitle.waitForExistence(timeout: 5), "Settings should load")

        // When: App goes to background (simulated by pressing home)
        // Note: XCUIDevice().press(.home) would put app in background
        // but we can't easily return it, so we verify the state is stable

        // Verify navigation is still correct
        let settingsTab = app.tabBars.buttons[AccessibilityID.TabBar.settings]
        XCTAssertTrue(settingsTab.isSelected, "Settings tab should remain selected")
    }

    // MARK: - Tab Bar Visibility Tests

    /// Tests tab bar remains visible during navigation.
    @MainActor
    func testTabBarVisibleDuringNavigation() throws {
        // Given: App launched
        app.launchWithMockData()

        // When: Navigate to different tabs
        for tabName in [AccessibilityID.TabBar.collection, AccessibilityID.TabBar.care, AccessibilityID.TabBar.settings] {
            app.navigateToTab(tabName)

            // Then: Tab bar should always be visible
            let tabBar = app.tabBars.firstMatch
            XCTAssertTrue(tabBar.exists, "Tab bar should be visible on \(tabName) tab")
        }
    }

    /// Tests tab bar hides appropriately during full screen presentations.
    @MainActor
    func testTabBarBehaviorDuringFullScreenPresentation() throws {
        // Given: App launched with potential for full screen cover (camera -> identification)
        app.launchWithConfiguration(mockData: true, additionalEnvironment: [
            "MOCK_CAPTURED_IMAGE": "YES"
        ])
        app.navigateToTab(AccessibilityID.TabBar.camera)

        // Look for use photo button which triggers full screen cover
        let usePhotoButton = app.buttons["Use this photo"]

        if usePhotoButton.waitForExistence(timeout: 5) {
            usePhotoButton.tap()

            // Wait for full screen cover
            // Tab bar may or may not be visible depending on implementation
            // Just verify no crash
            XCTAssertTrue(app.exists, "App should handle full screen presentation")
        }
    }
}