//
//  WaitHelpers.swift
//  PlantGuideUITests
//
//  Centralized wait helpers for UI tests.
//  Replaces sleep() with deterministic, predicate-based waits.
//

import XCTest

// MARK: - XCUIElement Wait Helpers

extension XCUIElement {

    /// Waits until the element exists and is hittable.
    /// - Parameter timeout: Maximum seconds to wait (default 5).
    /// - Returns: `true` if the element became hittable within the timeout.
    @discardableResult
    func waitUntilHittable(timeout: TimeInterval = 5) -> Bool {
        let predicate = NSPredicate(format: "exists == true AND isHittable == true")
        let expectation = XCTNSPredicateExpectation(predicate: predicate, object: self)
        return XCTWaiter.wait(for: [expectation], timeout: timeout) == .completed
    }

    /// Waits until the element disappears.
    /// - Parameter timeout: Maximum seconds to wait (default 5).
    /// - Returns: `true` if the element disappeared within the timeout.
    @discardableResult
    func waitUntilGone(timeout: TimeInterval = 5) -> Bool {
        let predicate = NSPredicate(format: "exists == false")
        let expectation = XCTNSPredicateExpectation(predicate: predicate, object: self)
        return XCTWaiter.wait(for: [expectation], timeout: timeout) == .completed
    }

    /// Waits until the element's value equals the expected string.
    /// - Parameters:
    ///   - expectedValue: Target value.
    ///   - timeout: Maximum seconds to wait (default 5).
    /// - Returns: `true` if the value matched within the timeout.
    @discardableResult
    func waitForValue(_ expectedValue: String, timeout: TimeInterval = 5) -> Bool {
        let predicate = NSPredicate(format: "value == %@", expectedValue)
        let expectation = XCTNSPredicateExpectation(predicate: predicate, object: self)
        return XCTWaiter.wait(for: [expectation], timeout: timeout) == .completed
    }

    /// Taps the element once it becomes hittable.
    /// - Parameter timeout: Maximum seconds to wait for hittable state.
    func tapWhenReady(timeout: TimeInterval = 5) {
        XCTAssertTrue(waitUntilHittable(timeout: timeout),
                      "Element \(debugDescription) not hittable after \(timeout)s")
        tap()
    }
}

// MARK: - XCUIApplication Wait Helpers

extension XCUIApplication {

    /// Waits for the main tab bar to appear, indicating the app launched successfully.
    /// - Parameter timeout: Maximum seconds to wait (default 10).
    @discardableResult
    func waitForLaunch(timeout: TimeInterval = 10) -> Bool {
        tabBars.firstMatch.waitForExistence(timeout: timeout)
    }

    /// Waits for any element matching the identifier to appear.
    /// - Parameters:
    ///   - identifier: The accessibility identifier.
    ///   - timeout: Maximum seconds to wait (default 5).
    /// - Returns: The first matching element if found.
    @discardableResult
    func waitForElement(identifier: String, timeout: TimeInterval = 5) -> XCUIElement {
        let element = descendants(matching: .any)[identifier]
        _ = element.waitForExistence(timeout: timeout)
        return element
    }
}