import XCTest

final class TextbookFlowUITests: XCTestCase {

    override func setUpWithError() throws {
        continueAfterFailure = false
    }

    func testTextbookFlow() throws {
        let app = XCUIApplication()
        // Skip onboarding via defaults (already set by run script, but harmless to override)
        app.launchArguments += ["-onboardingComplete", "YES"]
        app.launch()

        // Dashboard should be default tab. Switch to Course.
        let courseTab = app.tabBars.buttons["Course"]
        XCTAssertTrue(courseTab.waitForExistence(timeout: 5), "Course tab missing")
        courseTab.tap()

        // Attach a screenshot of the Course list
        attach(app, name: "01-course-list")

        // Tap the Textbook entry
        let textbookRow = app.buttons.containing(NSPredicate(
            format: "label CONTAINS[c] 'Complete Spanish'"
        )).firstMatch
        XCTAssertTrue(textbookRow.waitForExistence(timeout: 5), "Textbook row missing in Course")
        textbookRow.tap()

        attach(app, name: "02-textbook-chapter-list")

        // Tap chapter 1 — should navigate to reader
        let chapterOneRow = app.buttons.containing(NSPredicate(
            format: "label CONTAINS[c] 'Nouns, Articles'"
        )).firstMatch
        XCTAssertTrue(chapterOneRow.waitForExistence(timeout: 5), "Chapter 1 row missing")
        chapterOneRow.tap()

        attach(app, name: "03-chapter-body")

        // Find the first exercise link ("Exercise 1.1")
        let exerciseRow = app.buttons.containing(NSPredicate(
            format: "label CONTAINS[c] 'Exercise 1.1'"
        )).firstMatch
        XCTAssertTrue(exerciseRow.waitForExistence(timeout: 5), "Exercise 1.1 link missing")
        exerciseRow.tap()

        attach(app, name: "04-exercise-view")

        // Check presence of input fields: at least a few numbered prompts
        // Text fields use SwiftUI placeholder "Your answer"
        let firstField = app.textFields["Your answer"].firstMatch
        XCTAssertTrue(firstField.waitForExistence(timeout: 5), "No input fields rendered for exercise")
        firstField.tap()
        firstField.typeText("el")

        attach(app, name: "05-exercise-typed-el")

        // Tap Check answers
        let checkButton = app.buttons["Check answers"]
        XCTAssertTrue(checkButton.waitForExistence(timeout: 3), "Check answers button missing")
        checkButton.tap()

        attach(app, name: "06-exercise-graded")

        // The first answer to Exercise 1.1 is "el" — we should see the first prompt
        // graded correct. Iterating too deeply is fragile; just take a screenshot
        // and check for presence of either a checkmark-like label or "Try again".
        let tryAgain = app.buttons["Try again"]
        XCTAssertTrue(tryAgain.waitForExistence(timeout: 3), "Grading did not complete")
    }

    private func attach(_ app: XCUIApplication, name: String) {
        let screenshot = app.screenshot()
        let attachment = XCTAttachment(screenshot: screenshot)
        attachment.name = name
        attachment.lifetime = .keepAlways
        add(attachment)
    }
}