//
//  TheNoiseClockUITests.swift
//  TheNoiseClockUITests
//
//  Created by Matt Bruce on 9/7/25.
//

import XCTest

final class TheNoiseClockUITests: XCTestCase {

    override func setUpWithError() throws {
        continueAfterFailure = false
    }

    @MainActor
    func testAppStoreScreenshots_iPhone69() throws {
        let app = XCUIApplication()
        app.launchArguments += [
            "-onboarding.TheNoiseClock.hasCompletedWelcome", "YES",
            "-onboarding.TheNoiseClock.hasLaunched", "YES"
        ]
        app.launch()

        dismissOnboardingIfNeeded(app)
        ensureKeepAwakeEnabled(app)
        ensureAlarmExistsAndEnabled(app)

        captureNoiseViewPortraitAndLandscape(app)
        captureClockPortraitAndLandscape(app)
        captureAlarmsViewPortraitAndLandscape(app)
        captureSettingsViewPortraitAndLandscape(app)

        XCUIDevice.shared.orientation = .portrait
    }

    // MARK: - Capture Steps

    @MainActor
    private func captureClockPortraitAndLandscape(_ app: XCUIApplication) {
        XCUIDevice.shared.orientation = .portrait
        sleep(1)
        openTab(named: "Clock", in: app)
        waitForClockFullscreenTransition()
        saveScreenshot(named: "01-clock-view-portrait.png")

        XCUIDevice.shared.orientation = .landscapeLeft
        sleep(2)
        openTab(named: "Clock", in: app)
        waitForClockFullscreenTransition()
        saveScreenshot(named: "02-clock-view-landscape.png")
    }

    @MainActor
    private func captureAlarmsViewPortraitAndLandscape(_ app: XCUIApplication) {
        XCUIDevice.shared.orientation = .portrait
        sleep(1)
        openTab(named: "Alarms", in: app)
        sleep(1)
        saveScreenshot(named: "03-alarms-view-portrait.png")

        XCUIDevice.shared.orientation = .landscapeLeft
        sleep(2)
        openTab(named: "Alarms", in: app)
        sleep(1)
        saveScreenshot(named: "04-alarms-view-landscape.png")
    }

    @MainActor
    private func captureNoiseViewPortraitAndLandscape(_ app: XCUIApplication) {
        XCUIDevice.shared.orientation = .portrait
        sleep(1)
        openTab(named: "Noise", in: app)
        ensureNoiseSoundSelectedAndPlaying(app)
        sleep(1)
        saveScreenshot(named: "05-noise-view-portrait.png")

        XCUIDevice.shared.orientation = .landscapeLeft
        sleep(2)
        openTab(named: "Noise", in: app)
        ensureNoiseSoundSelectedAndPlaying(app)
        sleep(1)
        saveScreenshot(named: "06-noise-view-landscape.png")
    }

    @MainActor
    private func captureSettingsViewPortraitAndLandscape(_ app: XCUIApplication) {
        XCUIDevice.shared.orientation = .portrait
        sleep(1)
        openTab(named: "Settings", in: app)
        sleep(1)
        saveScreenshot(named: "07-clock-settings-portrait.png")

        XCUIDevice.shared.orientation = .landscapeLeft
        sleep(2)
        openTab(named: "Settings", in: app)
        sleep(1)
        saveScreenshot(named: "08-clock-settings-landscape.png")
    }

    @MainActor
    private func ensureNoiseSoundSelectedAndPlaying(_ app: XCUIApplication) {
        // Select a known sound so controls become visible.
        let soundNames = [
            "White Noise",
            "Brown Noise",
            "Heavy Rain",
            "Atmospheric Pad",
            "Fan Heater"
        ]
        var didSelectSound = false
        for _ in 0..<8 {
            for soundName in soundNames {
                let sound = app.staticTexts[soundName]
                if sound.exists && sound.isHittable {
                    sound.tap()
                    didSelectSound = true
                    break
                }
            }
            if didSelectSound {
                break
            }
            app.swipeUp()
            usleep(250_000)
        }

        let playButton = app.buttons["Play Sound"]
        if playButton.waitForExistence(timeout: 4) {
            playButton.tap()
        }
    }

    // MARK: - State Setup

    @MainActor
    private func dismissOnboardingIfNeeded(_ app: XCUIApplication) {
        let secondaryButton = app.buttons["onboarding.secondaryButton"]
        if secondaryButton.waitForExistence(timeout: 3), secondaryButton.label == "Skip" {
            secondaryButton.tap()
            waitForMainTabs(app)
            return
        }
        if app.buttons["Skip"].waitForExistence(timeout: 3) {
            app.buttons["Skip"].tap()
            waitForMainTabs(app)
            return
        }

        // Fallback: walk onboarding pages if skip is not available.
        for _ in 0..<6 {
            if hasMainTabs(app) { return }
            let next = app.buttons["Next"]
            let getStarted = app.buttons["Get Started"]

            if getStarted.exists {
                getStarted.tap()
                waitForMainTabs(app)
                return
            }
            if next.exists {
                next.tap()
                usleep(300_000)
            }
        }
    }

    @MainActor
    private func ensureKeepAwakeEnabled(_ app: XCUIApplication) {
        openTab(named: "Settings", in: app)

        let keepAwakeSwitch = app.switches["settings.keepAwake.toggle"]
        for _ in 0..<8 {
            if keepAwakeSwitch.exists { break }
            app.swipeUp()
            usleep(200_000)
        }

        guard keepAwakeSwitch.waitForExistence(timeout: 3) else {
            XCTFail("Could not find Keep Awake toggle by accessibility identifier.")
            return
        }
        
        if !isSwitchOn(keepAwakeSwitch) {
            keepAwakeSwitch.tap()
            sleep(1)
        }
    }

    @MainActor
    private func ensureAlarmExistsAndEnabled(_ app: XCUIApplication) {
        openTab(named: "Alarms", in: app)

        // If no alarms exist, create one with defaults.
        if app.staticTexts["No Alarms Set"].exists || app.buttons["Add Your First Alarm"].exists {
            let addFirstAlarm = app.buttons["Add Your First Alarm"]
            if addFirstAlarm.exists {
                addFirstAlarm.tap()
            } else {
                tapNavigationPlusButton(in: app)
            }

            let saveButton = app.buttons["Save"]
            XCTAssertTrue(saveButton.waitForExistence(timeout: 5), "Add Alarm sheet did not appear.")
            saveButton.tap()
            sleep(1)
        }

        // Make sure at least one alarm is enabled.
        let firstSwitch = app.switches.firstMatch
        if firstSwitch.waitForExistence(timeout: 3), !isSwitchOn(firstSwitch) {
            firstSwitch.tap()
            sleep(1)
        }
    }

    // MARK: - Helpers

    @MainActor
    private func openTab(named tabName: String, in app: XCUIApplication) {
        let expectedIndex: Int? = switch tabName {
        case "Clock": 0
        case "Alarms": 1
        case "Noise": 2
        case "Settings": 3
        default: nil
        }

        func tapByCoordinates(_ element: XCUIElement) {
            let coordinate = app.coordinate(withNormalizedOffset: CGVector(dx: 0, dy: 0))
                .withOffset(CGVector(dx: element.frame.midX, dy: element.frame.midY))
            coordinate.tap()
        }

        func tapLabeledButtonAnywhere() -> Bool {
            let matches = app.buttons.matching(NSPredicate(format: "label == %@", tabName))
                .allElementsBoundByIndex
                .filter(\.exists)
            guard !matches.isEmpty else { return false }

            if let hittable = matches.first(where: \.isHittable) {
                hittable.tap()
                return true
            }

            tapByCoordinates(matches[0])
            return true
        }

        func tapLabeledButton() -> Bool {
            let query = app.tabBars.buttons.matching(NSPredicate(format: "label == %@", tabName))
            let matches = query.allElementsBoundByIndex.filter(\.exists)
            guard !matches.isEmpty else { return false }

            if let hittable = matches.first(where: \.isHittable) {
                hittable.tap()
                return true
            }

            tapByCoordinates(matches[0])
            return true
        }

        func tapIndexedButton() -> Bool {
            guard let expectedIndex else { return false }
            let tabBar = app.tabBars.firstMatch
            guard tabBar.exists else { return false }
            let buttons = tabBar.buttons
            guard buttons.count > expectedIndex else { return false }
            let button = buttons.element(boundBy: expectedIndex)
            guard button.exists else { return false }
            button.tap()
            return true
        }

        if tapLabeledButton() || tapIndexedButton() {
            return
        }

        // Fallback for cases where tab buttons are not exposed under tabBars.
        if tapLabeledButtonAnywhere() {
            return
        }

        // Reveal tab bar when clock is in auto full-screen mode.
        app.coordinate(withNormalizedOffset: CGVector(dx: 0.5, dy: 0.5)).tap()
        usleep(300_000)
        app.coordinate(withNormalizedOffset: CGVector(dx: 0.5, dy: 0.98)).tap()
        usleep(300_000)

        if tapLabeledButton() || tapIndexedButton() || tapLabeledButtonAnywhere() {
            return
        }

        let buttonLabels = app.buttons.allElementsBoundByIndex
            .prefix(16)
            .map(\.label)
            .joined(separator: ", ")
        XCTFail("Could not open tab '\(tabName)' by label or index. tabBars=\(app.tabBars.count), buttons=[\(buttonLabels)]")
    }

    @MainActor
    private func tapNavigationPlusButton(in app: XCUIApplication) {
        let plusCandidates = [
            app.navigationBars.buttons["plus"],
            app.navigationBars.buttons["Add"],
            app.buttons["plus"]
        ]

        for candidate in plusCandidates where candidate.exists {
            candidate.tap()
            return
        }

        XCTFail("Could not find add (+) button.")
    }

    private func isSwitchOn(_ toggle: XCUIElement) -> Bool {
        guard let value = toggle.value as? String else { return false }
        return value == "1" || value.lowercased() == "on"
    }

    private func waitForClockFullscreenTransition() {
        // Clock auto-hides chrome after 5 seconds of inactivity.
        sleep(6)
    }

    private func saveScreenshot(named fileName: String) {
        let screenshot = XCUIScreen.main.screenshot()
        let data = screenshot.pngRepresentation
        let destination = screenshotDirectory().appendingPathComponent(fileName)

        do {
            try data.write(to: destination)
        } catch {
            XCTFail("Failed to write screenshot to \(destination.path): \(error)")
        }

        let attachment = XCTAttachment(data: data, uniformTypeIdentifier: "public.png")
        attachment.name = fileName
        attachment.lifetime = .keepAlways
        add(attachment)
    }

    private func screenshotDirectory() -> URL {
        let env = ProcessInfo.processInfo.environment["SCREENSHOT_OUTPUT_DIR"]
        let path = (env?.isEmpty == false) ? env! : NSTemporaryDirectory()
        let url = URL(fileURLWithPath: path, isDirectory: true)

        try? FileManager.default.createDirectory(at: url, withIntermediateDirectories: true)
        return url
    }

    private func waitForMainTabs(_ app: XCUIApplication) {
        for _ in 0..<20 {
            if hasMainTabs(app) { return }
            usleep(200_000)
        }
    }

    private func hasMainTabs(_ app: XCUIApplication) -> Bool {
        let labels = ["Clock", "Alarms", "Noise", "Settings"]
        if app.tabBars.count > 0 { return true }
        return labels.contains(where: { app.buttons[$0].exists })
    }
}